JP6104747B2 - Liquid dosing device - Google Patents

Description

  The present invention relates to a liquid administration device.

  Conventionally, a prefilled syringe that is filled with a chemical solution aseptically and that can administer the chemical solution is known (for example, see Patent Document 1).

  The prefilled syringe described in Patent Document 1 is a syringe outer cylinder (tubular body) filled with a chemical solution, a double-ended needle that is provided at the tip of the syringe outer cylinder and can communicate with the inside of the tubular body, and is inserted into the tubular body. And a gasket (second stopper) that can slide in the syringe outer cylinder and a plunger that presses the gasket. When a drug solution is administered using this prefilled syringe, a double-ended needle is attached to the distal end portion of the syringe outer cylinder so that the proximal end of the double-ended needle communicates with the inside of the syringe outer cylinder. In this communication state, the tip of the double-ended needle is punctured into the living body, and the plunger is pressed in this puncture state. Thereby, a chemical | medical solution can be administered in the biological body.

  In recent years, in order to prohibit the pressing operation until the proximal end of the double-ended needle communicates with the inside of the syringe outer cylinder, the prefilled syringe is provided with a rotating member that supports the double-ended needle. The rotating member rotates at a predetermined angle after the proximal end of the double-ended needle communicates with the inside of the syringe outer cylinder and the distal end of the double-ended needle punctures the living body. Before the rotating member rotates, for example, the pressing operation is prohibited by engaging the rotating member and the plunger. After the rotating member rotates, the engagement is released and a pressing operation can be performed. According to such a configuration, the pressing operation is performed before the tip of the double-ended needle punctures the living body, and the chemical liquid can be prevented from being unintentionally discharged.

  However, since the double-ended needle is supported by the rotating member, the double-ended needle in the puncture state also rotates when the rotating member rotates. As a result, the user may be excessively invasive by the rotating double-ended needle.

Special table 2010-540122 gazette

  An object of the present invention is to provide a liquid administration device capable of performing liquid administration with minimal invasiveness.

Such an object is achieved by the present inventions (1) to (11) below.
(1) an inner cylinder capable of being filled with liquid;
A puncture member that is disposed at the distal end of the inner cylinder, has a sharp needle tip at the distal end, can communicate with the inner cylinder, and a support member that supports the needle tube;
An operation member that performs a discharge operation of discharging the liquid from the needle tube in a state where the needle tube and the inner cylinder communicate with each other by moving toward the distal direction;
A cover member movable between at least a position (A) covering the needle tip and a position (B) at which the needle tip is exposed;
It is disposed on the outer peripheral side of the inner cylinder, is provided rotatably about the central axis of the inner cylinder with respect to the cover member, and until the cover member moves to the position (B), An outer cylinder that prohibits movement of the operating member, rotates when the cover member is positioned at the position (B), and releases the prohibition of movement of the operating member;
A liquid administration device comprising: a rotational force transmission preventing mechanism for preventing rotational force from being transmitted to the needle tube when the outer cylinder rotates.

(2) The support member has a cylindrical shape and is provided rotatably with respect to the outer cylinder.
The rotational force transmission preventing mechanism is provided on one of the outer cylinder and the support member, and is formed to protrude from the other cam groove having a lateral groove extending in the circumferential direction thereof, with the rotation of the outer cylinder. The liquid administration device according to (1), further including a follower portion that moves in the lateral groove.

(3) The support member is provided so as to be movable together with the needle tube in the rotation axis direction with respect to the outer tube, and the needle tube communicates with the inner tube by the movement.
The rotational force transmission preventing mechanism is provided in communication with the lateral groove, extends in the direction of the rotation axis, and has a vertical groove in which the follower portion moves as the support member moves in the direction of the rotation axis. The liquid administration device according to (2) above.

  (4) In the state where the needle tube and the inner cylinder are not yet communicated with each other, the support member is prevented from being detached from the outer cylinder by engaging the follower portion and the longitudinal groove (3) ) Liquid administration device.

(5) The support member has a cylindrical shape and is provided rotatably with respect to the outer cylinder.
The rotational force transmission preventing mechanism is provided on one of the support member and the cover member on a convex portion provided eccentric from the rotation shaft, and on the other, and the cover member is located at the position (B). The liquid administration device according to any one of (1) to (4), wherein the liquid administration device has a concave portion into which the convex portion is inserted.

  (6) The liquid administration device according to (5), wherein the concave portion has a tapered portion whose inner diameter is increased toward the convex portion.

(7) The support member has a cylindrical shape, is provided so as to be movable in the direction of the rotation axis, and has an engagement portion that is formed to protrude from the outer peripheral portion.
In the initial state where the discharge operation has not yet been performed, the needle tube and the inner cylinder are not in communication with each other,
The liquid according to any one of (1) to (6), wherein when the needle tip punctures a living body, the engagement portion is engaged with the outer cylinder to temporarily maintain the non-communication state. Administration device.

(8) The liquid administration device according to (7), wherein the engaging portion has a dome shape.
(9) The outer cylinder is provided along a circumferential direction thereof, and has an engagement groove in which the engagement portion moves when the outer cylinder rotates. (7) or (8) Liquid dosing device.

(10) having a biasing member that biases the cover member toward the distal direction with respect to the inner cylinder;
Any of (1) to (9), wherein the cover member and the operation member are engaged to prevent the cover member from moving in the distal direction relative to the operation member due to the urging force of the urging member. A liquid administration device according to claim 1.

(11) The operation member includes a grip portion that is disposed on an outer peripheral side of the cover member and is gripped when the operation member is operated.
The grip portion has a window portion through which a base end portion of the cover member can be visually recognized,
Any one of the above (1) to (10), wherein the position of the base end portion of the cover member visually recognized through the window during the discharge operation indicates the administration state of the liquid. The liquid administration device described.

  According to the present invention, the rotational force when the outer cylinder rotates can be prevented from being transmitted to the needle tube by the rotational force transmission preventing mechanism. Thereby, when the needle tube is inserted into the living body, the needle tube can be prevented from rotating. Therefore, the user can administer the liquid with minimal invasiveness.

  In particular, when the rotational force transmission preventing mechanism has a cam groove provided in the outer cylinder and a follower part provided in the support member, the follower part moves in the cam groove when the outer cylinder rotates. Thus, it is possible to reliably prevent the rotational force of the outer cylinder from being transmitted to the needle tube.

  And a convex portion provided on the support member, and a concave portion into which the convex portion is inserted when the cover member is located at the position (B). When the outer cylinder rotates, the non-rotating cover member and the supporting member are fixed so as not to rotate. Thereby, it can prevent more reliably that the rotational force of an outer cylinder is transmitted to a needle tube.

It is a side view which shows 1st Embodiment of the liquid administration device of this invention. It is a side view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a side view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a side view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a side view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a longitudinal cross-sectional view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a longitudinal cross-sectional view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a longitudinal cross-sectional view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a longitudinal cross-sectional view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a longitudinal cross-sectional view which shows the operation state at the time of use of the liquid administration tool shown in FIG. It is a perspective view which shows the operating state of the rotational force transmission prevention mechanism at the time of use of the liquid administration device shown in FIG. It is a perspective view which shows the operating state of the rotational force transmission prevention mechanism at the time of use of the liquid administration device shown in FIG. It is a figure which shows the process in which the follower part of the liquid administration device shown in FIG. 1 moves a cam groove in order, (a) is a figure which shows an initial state, (b) is a figure which shows a communication state, (c) These are figures which show an administration possible state. It is a perspective view of the base end side member of the outer cylinder of the liquid administration device shown in FIG. It is a perspective view of the front end side member of the outer cylinder of the liquid administration device shown in FIG. It is a perspective view of the cover member of the liquid administration device shown in FIG. It is a perspective view of the pusher of the liquid administration tool shown in FIG. It is a perspective view of the head of the operation member of the liquid administration device shown in FIG. It is a perspective view of the puncture needle of the liquid administration device shown in FIG. It is a perspective view of the front end side member of the outer cylinder of the liquid administration device shown in FIG. It is a longitudinal cross-sectional view which shows the operating state at the time of use of 2nd Embodiment of the liquid administration device of this invention. It is a longitudinal cross-sectional view which shows the operating state at the time of use of 2nd Embodiment of the liquid administration device of this invention. It is a perspective view which shows the cover member of 2nd Embodiment of the liquid administration device of this invention. It is a side view which shows the operating state at the time of use of 3rd Embodiment of the liquid administration device of this invention. It is a side view which shows the operating state at the time of use of 3rd Embodiment of the liquid administration device of this invention. It is a side view which shows the operating state at the time of use of 3rd Embodiment of the liquid administration device of this invention.

<First Embodiment>
1 is a side view showing a first embodiment of the liquid administration device of the present invention, FIGS. 2 to 5 are side views sequentially showing operating states of the liquid administration device shown in FIG. 1, and FIGS. 10 is a longitudinal sectional view sequentially showing the operating state when the liquid administration device shown in FIG. 1 is used, and FIGS. 11 and 12 show the operation state of the rotational force transmission preventing mechanism when the liquid administration device shown in FIG. 1 is used. FIGS. 13A and 13B are diagrams sequentially illustrating a process in which the follower portion of the liquid administration device illustrated in FIG. 1 moves in the cam groove, where FIG. 13A is a diagram illustrating an initial state, and FIG. The figure which shows a state, (c) is a figure which shows an administration possible state, FIG. 14 is a perspective view of the base end side member of the outer cylinder of the liquid administration tool shown in FIG. 1, FIG. 15 is the liquid administration shown in FIG. FIG. 16 is a perspective view of a cover member of the liquid administration device shown in FIG. 1, and FIG. 17 is a perspective view of the liquid administration device shown in FIG. FIG. 18 is a perspective view of the head of the operating member of the liquid administration device shown in FIG. 1, FIG. 19 is a perspective view of the puncture needle of the liquid administration device shown in FIG. 1, and FIG. It is a perspective view of the front end side member of the outer cylinder of the liquid administration tool shown in FIG. In the following, the upper side in FIGS. 1 to 20 is “base end (rear end)” or “upper (upper)”, the lower side is “tip” or “lower (lower)”, and the vertical direction is “axis ( The description will be made as “rotation axis) direction” or “longitudinal direction”.

  A liquid administration device 100 shown in FIGS. 1 to 10 is a medical device used when a liquid is administered (injected) to a living body. The liquid is appropriately selected according to the purpose of use. For example, hematopoietics, vaccines, hormone preparations, anti-rheumatic agents, anti-cancer agents, anesthetics, anticoagulants, gel preparations, etc. Drug solution injected subcutaneously.

  The liquid administration device 100 includes an inner structure (structure) 1, a gasket 8, an operation member 5, a cover member 6 disposed on the outer peripheral side of the inner structure 1, and the cover member 6 facing the distal direction. A coil spring 13 as an urging member for urging, an auxiliary mechanism 40, and a rotational force transmission preventing mechanism 10 are provided.

  As shown in FIG. 6, the inner structure 1 includes a cylindrical body 2 composed of an inner cylinder 3 and an outer cylinder 4, a puncture needle 7 composed of a double-ended needle (needle tube) 71 and a support member 72, A gasket 8 that is installed in the inner cylinder 3 (cylinder body 2) and that can slide along the central axis direction of the inner cylinder 3 is provided.

  As shown in FIG. 6, the inner cylinder 3 has an inner cylinder main body 31. The inner cylinder main body 31 is composed of a bottom portion 32 at a distal end portion, a side wall 33 standing from an edge of the bottom portion 32, and a member having an opening portion at a proximal end portion, that is, a member having a bottomed cylindrical shape. The inner cylinder 3 can be filled with liquid. In addition, the front end portion of the inner cylinder main body 31, that is, the central portion of the bottom portion 32 is integrally formed with a mouth portion 34 that is reduced in diameter relative to the portion of the side wall 33 of the inner cylinder main body 31 and through which the liquid passes. Yes. From the mouth portion 34, liquid is sucked or discharged.

  The inner cylinder 3 has a sealing member (sealing part) 11 for liquid-tightly sealing the mouth part 34 of the inner cylinder main body 31 and a fixing member 12 for fixing the sealing member 11 from the distal end side. doing.

  The sealing member 11 is made of an elastic body, and has a convex portion formed on the base end surface thereof. By fitting the convex portion into the mouth portion 34 in a liquid-tight manner, the mouth portion 34 is sealed in a liquid-tight manner. doing.

  The fixing member 12 is a cylindrical member. The fixing member 12 is fitted from the outer peripheral side of the sealing member 11 and the mouth portion 34, and fixes the sealing member 11 to the inner cylinder main body 31. Thereby, the detachment | leave from the inner cylinder main body 31 of the sealing member 11 is prevented reliably. In addition, as a fixing method of the fixing member 12, a method by adhesion or a method by welding may be used.

  Moreover, it does not specifically limit as a constituent material of the inner cylinder main body 31, the fixing member 12, the outer cylinder 4, the cover member 6, the support member 72, and the operation member 5, For example, polyvinyl chloride, polyethylene, polypropylene, cyclic polyolefin, Polystyrene such as polystyrene, poly- (4-methylpentene-1), polycarbonate, acrylic resin, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polyethylene naphthalate, butadiene-styrene copolymer, polyamide (for example, nylon) 6, various types of resins such as nylon 6,6, nylon 6,10, nylon 12). Among them, polypropylene, cyclic polyolefin, polyester, poly- (4-methyl) are easy to mold. Resins like pentene-1) Masui.

  The elastic material constituting the sealing member 11 and the gasket 8 is not particularly limited. For example, various rubber materials such as natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, silicone rubber, Examples include elastic materials such as various thermoplastic elastomers such as polyurethane, polyester, polyamide, olefin, and styrene, and mixtures thereof.

  An outer cylinder 4 is disposed concentrically with the inner cylinder 3 on the outer peripheral side of the inner cylinder 3. As shown in FIGS. 11, 12, and 15, the overall shape of the outer cylinder 4 has a cylindrical shape with both ends opened, and the length thereof is longer than that of the inner cylinder 3. The outer cylinder 4 is rotatable with respect to the inner cylinder 3 with the central axis as a rotation axis.

  The outer cylinder 4 includes a proximal end member 4a shown in FIG. 14 disposed on the proximal end side and a distal end side member 4b shown in FIG. 15 disposed on the distal end side. On the proximal end side of the distal end side member 4b, a pair of hole portions 41b arranged to face each other is formed. In addition, a pair of arm portions 41a which are elastic and are arranged so as to face each other are formed on the distal end side of the base end side member 4a so as to protrude in the distal end direction. Each has a claw 42a projecting outward. Each claw 42a is inserted into each hole 41b from the inside on the proximal end side of the distal end side member 4b, and each claw 42a and each hole 41b are engaged, and the proximal end side member 4a and the distal end side member 4b are engaged with each other. It is connected.

  In addition, the method of connecting the base end side member 4a and the front end side member 4b is not limited to this, For example, fusion | bonding, such as adhesion | attachment heat fusion | melting by an adhesive agent or a solvent, high frequency fusion, ultrasonic fusion Etc.

  Further, the outer cylinder 4 is formed at the body portion 41, the distal end side of the body portion 41, the reduced diameter portion 42b having a diameter reduced with respect to the body portion 41, and the base end portion of the body portion 41, A diameter-reduced portion 45 a having a diameter reduced with respect to the body portion 41 is provided.

  In addition, a pair of grooves 43b and a pair of long holes 44b penetrating the trunk portion 41 are formed in the trunk portion 41 of the distal end side member 4b. The grooves 43b are arranged to face each other, and similarly, the long holes 44b are also arranged to face each other. In addition, since each groove | channel 43b is the same shape, below, one groove | channel 43b is demonstrated typically. Similarly, each of the long holes 44b has the same shape, and therefore, one of the long holes 44b will be typically described below. In the present embodiment, the groove 43b is bottomed, but may penetrate the body portion 41. In this case, the same effect is obtained (not shown). Further, in the present embodiment, the long hole 44b penetrates the body portion 41, but it may be recessed without penetrating, and the same effect is obtained in this case (not shown).

  Further, the groove 43 b and the long hole 44 b are arranged side by side along the circumferential direction of the body portion 41. In the present embodiment, as shown in FIG. 15, the groove 43b is disposed on the left side of the long hole 44b.

  Further, the groove 43b and the long hole 44b extend along the axis of the body portion 41, respectively. And the groove | channel 43b is formed from the front-end | tip of the front end side member 4b to the base end, and is open | released at the front-end | tip and base end of the front end side member 4b, respectively. Further, the end face on the base end side of the long hole 44b is positioned on the front end side with respect to the base end of the groove 43b, and the end face on the base end side of the long hole 44b is set perpendicular to the axis of the trunk portion 41. ing.

  In addition, a space 45b is formed in a portion of the trunk portion 41 on the base end side of the groove 43b and the long hole 44b.

  In addition, the thickness of the portion between the long hole 44b and the space 45b of the trunk portion 41 is gradually reduced from the distal end side toward the proximal end side, whereby a tapered surface is formed on the outer peripheral surface of the trunk portion 41. Is formed. Thereby, the protrusion 613 of the cover member 6 can smoothly move from the space 45b to the long hole 44b.

  In addition, a pair of projecting portions 40a disposed so as to face each other is formed on the proximal end side of the reduced diameter portion 45a of the proximal end side member 4a. Each protrusion 40a is formed to protrude inward from the inner peripheral surface of the reduced diameter portion 45a, that is, toward the central axis.

  In addition, a protrusion (second engagement portion) 49a is formed so as to protrude toward the proximal end at the end portion (tip portion) on the central axis side of each protrusion portion 40a.

  Each protrusion 49a has an inclined surface 491a with which each step part 516, which will be described later, abuts as a rotation mechanism. The rotating mechanism rotates the stepped portion 516 and the protrusion 49a that are in an engaged state relatively around the central axis of the inner structure 1 to be in a released state. The inclined surface 491a is a flat surface in the illustrated configuration. The inclined surface 491a is centered on the central axis of the inner structure 1 in a plan view and faces the tangential direction of a circle passing through the inclined surface 491a. As a result, the step portion 516 moves relative to the protrusion 49a along the inclined surface 491a, so that the outer cylinder 4 rotates relative to the operation member 5 around the central axis of the outer cylinder 4. .

  In addition, the inclination angle θ of the inclined surface 491a is not particularly limited, and is appropriately set according to various conditions, but is preferably 5 to 85 °, and more preferably 20 to 70 °. .

  The shape of the inclined surface 491a is not limited to a flat surface, and may be a curved surface. Moreover, the number of each protrusion part 40a is not restricted to two, respectively, For example, one may be sufficient and three or more may be sufficient. Further, a flat surface may be used instead of the inclined surface 491a.

Further, on the proximal end side of the reduced diameter portion 45a of the proximal end side member 4a, a pair of arm portions 46a having elasticity and arranged so as to face each other are formed to protrude in the proximal direction, A claw 47a that protrudes inward is formed at the tip of the arm portion 46a. The inner cylinder 3 is installed between each protruding portion 40a of the outer cylinder 4 and the reduced diameter portion 42b. Then, the axial movement of the inner cylinder 3 relative to the outer cylinder 4 is prevented by being sandwiched from above and below by the base end side member 4a and the distal end side member 4b.

  As shown in FIGS. 1, 15, and 20, a pair of grooves 42 into which a pair of protrusions 63 described later of the cover member 6 are inserted is formed on the outer peripheral surface of the body 41 of the outer cylinder 4. Has been. In the present embodiment, each groove 42 is formed so as to penetrate the wall portion of the trunk portion 41, but is not limited thereto, and may not penetrate the wall portion of the trunk portion 41. Since each groove 42 is the same, one groove 42 will be typically described below.

  The groove 42 extends on the outer peripheral surface of the body portion 41 in the axial direction of the outer cylinder 4, and forms a linear groove (second groove) 421 formed linearly with a predetermined angle with respect to the axis of the outer cylinder 4. An inclined groove (first groove) 422 formed to incline and a linear groove (third groove) 423 extending in the axial direction of the outer cylinder 4 and formed in a straight line are configured. . The distal end portion of the linear groove 423 is located on the proximal end side with respect to the distal end portion of the linear groove 421, and the proximal end portion of the linear groove 423 is located on the proximal end side with respect to the proximal end portion of the linear groove 421. Further, the inclined groove 422 is formed shorter than one round.

  These linear grooves 421, inclined grooves 422, and linear grooves 423 are formed continuously from the left side to the right side in FIG. The base end portion of the linear groove 421 and the tip end portion (left end portion in FIG. 1) of the inclined groove 422 communicate with each other, and the base end portion (right end portion in FIG. 1) of the inclined groove 422 The base end of the linear groove 423 communicates.

  When the cover member 6 moves in the axial direction of the outer cylinder 4 due to the groove 42 and the protrusion 63 of the cover member 6, the outer cylinder 4 rotates to the right in FIG. 1 with respect to the cover member 6 and the inner cylinder 3. That is, when the protrusion 63 moves relative to the cover member 6 along the inclined groove 422, the outer cylinder 4 rotates relative to the cover member 6 around the central axis. The outer cylinder 4 rotates relative to the operation member 5 around the central axis of the outer cylinder 4. Accordingly, the protrusion 63 and the inclined groove 422 constitute a rotation mechanism.

Further, when the cover member 6 is in a position (A) described later, the protrusion 63 is inserted into the linear groove 421, whereby the outer cylinder 4 rotates relative to the cover member 6 around the central axis. This prevents the outer cylinder 4 from rotating relative to the operating member 5. Accordingly, the protrusion 63 and the linear groove 421 are relatively engaged around the central axis of the inner structure 1 between the stepped portion (first engaging portion) 516 and the protrusion (second engaging portion) 49a in the engaged state. A rotation prevention mechanism is configured to prevent proper rotation.
The groove may be provided in the cover member 6, and the protrusion may be provided in the outer cylinder 4.

  As shown in FIGS. 6 to 10, a puncture needle 7 is disposed at the distal end of the cylindrical body 2. The puncture needle 7 includes a double-ended needle 71 and a support member 72 that supports and fixes the double-ended needle 71.

  The double-ended needle 71 is a hollow needle tube, has a sharp distal needle tip (needle tip) 711 at the distal end, and has a sharp proximal needle tip 712 at the proximal end. This double-ended needle 71 can puncture a living body with the distal needle tip 711 and can pierce the sealing member 11 of the inner cylinder 3 with the proximal needle tip 712.

  The lumen portion (hollow portion) of the double-ended needle 71 communicates with the inner cylinder 3 in a state where the proximal needle tip 712 penetrates the sealing member 11 of the inner cylinder 3, and the liquid from the inner cylinder 3 Functions as a flow path through which.

  After the living body is punctured from the skin to a predetermined depth with the distal needle tip 711 of the double-ended needle 71, the proximal needle tip 712 penetrates the sealing member 11 of the inner cylinder 3, and the flow path of the double-ended needle 71 passes through the body. Through which liquid is injected.

  In addition, it does not specifically limit as a constituent material of the double-ended needle 71, For example, metal materials, such as stainless steel, aluminum, or an aluminum alloy, titanium, or a titanium alloy, are mentioned.

  The double-ended needle 71 having such a configuration is attached to the distal end portion of the outer cylinder 4 (tubular body 2), that is, the reduced diameter portion 42b via the support member 72 so as to be movable along the axial direction of the outer cylinder 4. ing. The support member 72 supports the double-ended needle 71 movably along the axial direction and the circumferential direction with respect to the outer cylinder 4. The support member 72 has a bottomed cylindrical shape. The double-ended needle 71 is supported and fixed to the bottom portion of the support member 72 at an intermediate position.

  One or a plurality of long holes (not shown) extending in the axial direction of the support member 72 and opening in the proximal direction are formed between the adjacent protrusions 721 of the support member 72. Yes. Thereby, the site | part of the base end side of the supporting member 72 can be elastically deformed, and can be diameter-reduced or expanded.

  Further, four engaging portions 723 are formed to protrude from the outer peripheral portion of the support member 72. The engaging portions 723 are arranged at equal intervals along the circumferential direction of the support member 72. Since each engaging part 723 is the same composition, below, one engaging part 723 of them is explained typically.

  The engaging portion 723 has a dome-shaped outer shape, and the protruding amount is smaller than that of the protrusion 721. The engaging portion 723 is located on the tip side (downward) from the protrusion 721. Further, the engaging portion 723 has the same position in the circumferential direction as the protrusion 721.

  As shown in FIG. 6, when the double-ended needle 71 punctures a living body, the engaging portion 723 engages with the edge portion of the distal end opening 421b of the reduced diameter portion 42b. When the puncture needle 7 punctures a living body, the puncture needle 7 tends to move toward the proximal end side with respect to the outer tube 4 by a resistance force received from the living body. However, the engagement can prevent the puncture needle 7 from moving toward the base end side with respect to the outer cylinder 4. Therefore, the puncture needle 7 can puncture a living body reliably.

  Further, when a pressing operation is further performed after the puncture needle 7 punctures the living body, the engaging portion 723 having a dome shape gets over the tube wall of the reduced diameter portion 42b. Thereby, the engagement is released, and the support member 72 can move toward the base end side with respect to the outer cylinder 4. By this movement, the proximal needle tip 712 of the double-ended needle 71 punctures the sealing member 11, and the double-ended needle 71 and the inner cylinder 3 can communicate with each other.

  As described above, according to the engaging portion 723, until the puncture of the living body with the double-ended needle 71 is completed, a temporarily non-communication state in which the double-ended needle 71 and the inner cylinder 3 are not yet in communication is ensured. Can be maintained. Therefore, unintentional leakage of the liquid from the double-ended needle 71 can be prevented until the living body puncture by the double-ended needle 71 is completed.

  As shown in FIGS. 6 to 10, the cover member 6 is disposed on the outer peripheral side of the outer cylinder 4 (tubular body 2).

  Similar to the puncture needle 7, the cover member 6 is supported so as to be movable along the axial direction with respect to the outer cylinder 4 (tubular body 2). Thereby, after the front end surface 622 of the cover member 6 comes into contact with the living body, the front end side needle tip 711 of the double-ended needle 71 is punctured from the skin to a predetermined depth of the living body.

  The cover member 6 takes five stages (positions) before and after use, as will be described later. These five positions are the first positions (position (A)) where the cover member 6 protrudes from the distal end side needle tip 711 of the double-ended needle 71 to the distal end side before use (see FIGS. 1, 6, and 11). ), The second position (see FIG. 2) before the cover member 6 is retracted from the first position in the proximal direction and the outer cylinder 4 is rotated with respect to the cover member 6 and the inner cylinder 3, and the outer cylinder The third position (see FIGS. 3, 7, and 12) 4 is rotated by a predetermined angle with respect to the cover member 6 and the inner cylinder 3, and the distal end of the operation member 5 reaches the distal end of the cover member 6 for administration. The cover member 6 moves in the distal direction from the fourth position (FIGS. 4 and 8) where the movement is completed and the fourth position (third position), and the cover member 6 is the distal needle tip of the double-ended needle 71. The fifth position (FIG. 5) is the safety mechanism operating state that protrudes to the tip side from 711 and the safety mechanism after the administration is activated. Figure 9 is a diagram reference 10).

  In the present embodiment, when the cover member 6 is in the first position, the distal end surface 622 of the cover member 6 protrudes from the distal end side needle tip 711 of the double-ended needle 71 to the distal end side, and the double-ended needle is detected by the cover member 6. The tip end needle tip 711 of 71 is covered. As a result, since the distal end needle tip 711 of the double-ended needle 71 is not exposed until the cover member 6 moves from the first position to the proximal end side, the distal end needle tip 711 of the double-ended needle 71 before the user punctures. Can be prevented from being erroneously pierced and the tip side needle tip 711 being damaged. Further, when the cover member 6 is in the second to fourth positions (position (B)), the tip side needle tip 711 of the double-ended needle 71 is exposed from the tip of the cover member 6.

  Note that the puncture needle 7 described above is in a separated state that is located on the proximal side from the distal end portion of the cover member 6 when the cover member 6 is in the first position. On the other hand, when the cover member 6 moves to the second position, the cover member 6 presses and moves the double-ended needle 71 (the double-ended needle 71 together with the support member 72) toward the proximal direction. The side needle tip 712 penetrates the sealing member 11 of the cylindrical body 2, and the tip side needle tip 711 of the double-ended needle 71 is punctured by a living body. However, when the cover member 6 is in the second position, the piercing of the sealing member 11 of the proximal needle tip 712 of the double-ended needle 71 is not completed, and the inner upper end surface of the support member 72 and the outer cylinder This is a state in which the distal end surface of the reduced diameter portion 42b of the fourth distal end side member 4b is slightly separated. Then, at the third position where the outer cylinder 4 is rotated with respect to the cover member 6 and the inner cylinder 3, the penetration of the sealing member 11 of the proximal needle tip 712 of the double-ended needle 71 is completed, and the support member 72 The inner upper end surface and the distal end surface of the reduced diameter portion 42b of the distal end side member 4b of the outer cylinder 4 are in contact with each other.

  The cover member 6 includes a plate-like distal end wall portion 62 disposed at the distal end portion and a side wall 61 erected in the proximal direction from the distal end wall portion 62, that is, has a bottomed cylindrical shape. It is composed of members. The cover member 6 has a tip surface 622 at the tip.

  An opening 621 that penetrates the central portion is formed in the central portion of the tip wall portion 62. As shown in FIGS. 6 to 10, when the cover member 6 is in the second to fourth positions, the tip side needle tip 711 of the double-ended needle 71 protrudes (exposes) from the opening 621.

  As shown in FIG. 16, the side wall 61 has a cylindrical shape. A pair of ribs 614 are formed on the outer peripheral surface of the base end portion of the side wall 61 so as to protrude outward and to face each other. Each rib 614 extends in the axial direction of the cover member 6.

  Further, in the middle of the side wall 61, a pair of arm portions 612 having elasticity and arranged so as to face each other are formed to protrude in the proximal direction, and at the proximal end portion of each arm portion 612, Protrusions 613 projecting inward are formed. Each protrusion 613 is disposed on the distal end side of the base end of the side wall 61. When viewed from the axial direction of the cover member 6, the arm portion 612, the protrusion 613, and the rib 614 are arranged at substantially equal intervals along the circumferential direction of the cover member 6.

  In addition, a pair of protrusions 63 are formed on the inner peripheral surface of the base end portion of the side wall 61 so as to protrude inward and to face each other (see FIGS. 1 and 16). Each protrusion 63 is inserted into each groove 42 of the outer cylinder 4, that is, engages with each groove 42. The relationship between the protrusion 63 and each groove 42 of the outer cylinder 4 in a series of operations will be described later.

  In the unused state (initial state), each projection 613 of the cover member 6 is inserted into each groove 43 b of the outer cylinder 4. When the cover member 6 moves in the axial direction of the outer cylinder 4 and the outer cylinder 4 rotates by a predetermined angle with respect to the cover member 6 by the groove 42 of the outer cylinder 4 and the protrusion 63 of the cover member 6, Each protrusion 613 moves to a position on the base end side of each long hole 44b in each space 45b of the outer cylinder 4.

  As shown in FIGS. 6 to 10, a coil spring (compression coil spring) 13 is housed in a compressed state inside the cover member 6. The coil spring 13 has a distal end in contact with the distal end wall portion 62 inside the cover member 6, and a proximal end portion of the coil spring 13 is in contact with the distal end side inside of the body portion 41 of the outer cylinder 4. The compressed state in the unused state is such that the coil spring 13 is compressed by the weight applied to the tip of the outer cylinder 4. The coil spring 13 is configured so that the distal end portion of the coil spring 13 is in contact with the distal end wall portion 62 inside the cover member 6 and the proximal end portion of the coil spring 13 is in contact with the distal end side inside of the body portion 41 of the outer cylinder 4. It does not have to be compressed. With this coil spring 13, for example, the cover member 6 can be urged in the direction from the second position toward the first position (ie, urged toward the distal end direction). Such a biasing force of the coil spring 13 allows the distal end surface 622 of the cover member 6 to protrude from the distal end side needle tip 711 of the double-ended needle 71 to the distal end side until the liquid administration device 100 is used. An erroneous puncture by the tip side needle tip 711 can be reliably prevented.

  In addition, it does not specifically limit as a constituent material of the coil spring 13, For example, metal materials, such as stainless steel and copper, can be used.

  The gasket 8 is accommodated in the inner cylinder 3 (tubular body 2) so as to be slidable along the axial direction of the inner cylinder 3. The space surrounded by the gasket 8 and the inner cylinder 3 is preliminarily filled with liquid. Then, by moving the gasket 8 toward the distal direction, the liquid in the inner cylinder 3 can be pushed out from the double-ended needle 71 in a state communicating with the inner cylinder 3.

  The gasket 8 has a cylindrical outer shape, and three protrusions 81 are formed on the outer periphery thereof. Adjacent protrusion 81 and protrusion 81 are separated along the axial direction of gasket 8. Each protrusion 81 has a ring shape along the circumferential direction of the gasket 8, and its outer diameter is slightly larger than the inner diameter of the inner cylinder 3 in a natural state where no external force is applied. Accordingly, each protrusion 81 can slide while being in close contact with the inner peripheral portion of the side wall 33 of the inner cylinder 3, so that liquid-tightness is reliably maintained and slidability is improved. Can be planned.

  In addition, a recess 82 is formed in the base end surface of the gasket 8 to which the main body 511 of the pusher 51 of the operation member 5 is inserted (fitted) and connected.

  As shown in FIG. 1 and FIG. 6, the operation member 5 is connected to the head 53, the gripping part (outermost cylinder) 52, and the proximal end side of the gasket 8, and presses the gasket 8 toward the distal direction. And a pusher 51. The head 53, the pusher 51, and the grip 52 are connected. The operation member 5 moves the pusher 51 in the distal direction, thereby moving the gasket 8 toward the distal direction, thereby ejecting the liquid in the inner cylinder 3 from the double-ended needle 71 (discharge operation). It is a member which performs.

  As shown in FIG. 17, the pusher 51 has a rod-like main body portion 511 whose cross section has a cross shape or a circular shape, for example, and the gasket 8 is fixed to the tip of the main body portion 511. A disc-shaped flange 512 is formed at the base end of the main body 511.

  The distal end of the main body 511 has a shape corresponding to the shape of the recess 82 of the gasket 8, and the distal end of the body 511 is inserted into the recess 82 of the gasket 8, whereby the pusher 51 (operation member 5) and The gasket 8 is connected. In addition, the method of fixing the gasket 8 to the main body 511 is not limited to this. For example, a male screw is formed on the main body 511 and a female screw that is screwed to the male screw is formed on the gasket 8. And a method of screwing the two together. In the present embodiment, the operation member 5 is connected to the proximal end side of the gasket 8, but may not be connected.

  In addition, a pair of arm portions 514 that are elastic and are arranged so as to face each other are formed on the outer peripheral portion of the proximal end surface of the flange 512 of the pusher 51 so as to protrude in the distal end direction. Claws 515 projecting outward are formed at the respective tip portions.

  The flange 512 is formed with a pair of hole portions 517 arranged so as to face each other through the center thereof, and a pair of hole portions 518 arranged so as to face each other via the center. ing. Further, the holes 517 and the holes 518 are alternately arranged.

  In addition, a rib 513 extending in the radial direction of the flange 512 is formed in the central portion on the proximal end side of the flange 512. Grooves 5131 are formed at both ends of the rib.

  Further, the main body portion 511 of the pusher 51 has a plate-like portion having a longitudinal shape, and serves as a first engagement portion that can engage with a pair of protrusions (second engagement portions) 49a. And a pair of step portions 516 in which the width of the plate-like portion is changed. That is, a pair of stepped portions (first engaging portions) 516 arranged to face each other is formed on the distal end side of the main body portion 511 of the pusher 51. When the stepped portion 516 and the projection 49a are engaged with each other, the stepped portion 516 and the projection 49a are engaged to prevent the pressing operation, and when the engaged state is released, the pressing operation can be performed. An engagement mechanism that takes a released state is configured.

  Note that the number of stepped portions (first engaging portions) 516 is not limited to two, but may be one, for example, or may be three or more.

  Further, the step portion (first engagement portion) may be provided on the inner structure 1 and the protrusion (second engagement portion) may be provided on the operation member 5.

  In the unused state (initial), each step portion 516 of the pusher 51 is engaged with or can be engaged with each protrusion 49 a of the outer cylinder 4, whereby the tip of the pusher 51 with respect to the cylindrical body 2. Movement in the direction is prevented (see FIGS. 1 and 2). When the cover member 6 moves in the axial direction of the outer cylinder 4 and the outer cylinder 4 moves to a position where the outer cylinder 4 can rotate by a predetermined angle with respect to the cover member 6 by the groove 42 of the outer cylinder 4 and the protrusion 63 of the cover member 6 Each step portion 516 of the pusher 51 moves to a position shifted from each projection 49 a of the outer cylinder 4, and the engagement between each step portion 516 and each projection 49 a is released, whereby the pusher 51 with respect to the cylindrical body 2. Is ready for administration (see FIGS. 3, 7, and 13 (c)).

  Thus, the outer cylinder 4 prohibits the movement of the operation member 5 until the cover member 6 moves to the fourth position, and rotates when the cover member 6 is located at the fourth position. The function of canceling the prohibition of the movement of the operation member 5 is provided.

  The grip portion 52 is disposed on the outer peripheral side of the inner structure 1 and the cover member 6. The grip portion 52 has a cylindrical shape and is a portion that is gripped during use.

  In addition, a pair of hole portions 521 arranged to face each other are formed at the base end portion of the grip portion 52. And each nail | claw 515 of the pusher 51 is inserted in each hole 521 from the inner side of the holding part 52, and each nail | claw 515 and each hole 521 engage, and the holding part 52 and the pusher 51 are connected. Has been.

  In addition, a pair of grooves (not shown) arranged to face each other are formed on the inner peripheral surface of the grip portion 52. Each groove extends along the axial direction of the grip portion 52. And each rib 614 of the cover member 6 is inserted in each groove. Thereby, rotation of the cover member 6 with respect to the grip part 52 is prevented.

  The head 53 is installed on the proximal end side of the flange 512 of the grip portion 52 and the pusher 51. As shown in FIGS. 1 to 5 and FIG. 18, the head 53 has a mortar shape. And the base end surface of the head 53, that is, the outer surface, is flat so that the center portion is flat, and the periphery thereof is curved so that the base end side is convex. Since the head 53 has a curved surface, the operation member 5 can be easily grasped with one hand. In addition, since a flat surface is formed at the center of the head 53, when the pressing operation is performed with both hands, the pressing operation can be easily performed.

  Further, as shown in FIG. 18, a pair of arm portions 531 having elasticity and arranged so as to face each other are formed in the distal end surface of the head 53, that is, the outer peripheral portion of the inner surface, so as to protrude in the distal direction. A claw 532 that protrudes inward is formed at the tip of each arm portion 531.

  Then, each claw 532 of each arm portion 531 of the head 53 is inserted into each hole 518, and each claw 532 and each hole 518 are engaged, whereby the head 53 and the pusher 51 are connected. ing.

  The auxiliary mechanism 40 has a function of generating an auxiliary force (pressing force) that presses the gasket 8 via the pusher 51 of the operation member 5. As shown in FIGS. 6 to 10, in the present embodiment, the auxiliary mechanism 40 is configured by a single coil spring 9. The coil spring 9 is a tension spring used in an extended state. The coil spring 9 is provided at a coil spring body 90, a hook 91 which is a first attachment portion attached to the inner structure 1 and a proximal end portion of the coil spring body 90, and is provided at a distal end portion of the coil spring body 90. And a hook 92 which is a second attachment portion attached to the member 5.

  The shapes of the hooks 91 and 92 are not particularly limited, but are U-shaped in the present embodiment. Examples of other shapes include a V shape and a U shape.

  Further, when viewed from the axial direction of the coil spring 9, the pusher 51 is disposed inside the coil spring 9, and the coil spring 9 is wound along the outer periphery of the pusher 51, that is, on the outer peripheral side of the pusher 51. The pusher 51 and the cylindrical body 2 are arranged concentrically. As shown in FIGS. 6 and 7, the coil spring 9 is stretched, and the hook 91 is hooked on the support portion 43 forming the rod shape of the outer cylinder 4, and the hook 92 is the groove 5131 of the rib 513 of the pusher 51. It is hung on.

  As a result, the coil spring 9 biases the inner structure 1 and the operation member 5 in a direction approaching each other. That is, the coil spring 9 generates an auxiliary force that presses the gasket 8 in the distal direction via the pusher 51 of the operation member 5. Thereby, in the case of pressing operation, the operation member 5 can be easily moved to the front-end | tip direction.

  In addition, it does not specifically limit as a constituent material of the coil spring 9, For example, the material similar to the constituent material of the coil spring 13 can be used.

  Now, the liquid administration device 100 includes a rotational force transmission preventing mechanism 10 that prevents the rotational force from being transmitted to the double-ended needle 71 when the outer cylinder 4 rotates. The rotational force transmission preventing mechanism 10 includes a first rotational force transmission preventing unit 10A and a second rotational force transmission preventing unit 10B.

  10 A of 1st rotational force transmission prevention parts are comprised by the cam groove 15 of the front end side member 4b, and the processus | protrusion (follower part) 721 of the support member 72. As shown in FIG. First, the cam groove 15 will be described.

  As shown in FIG. 20, four cam grooves 15 are formed on the inner peripheral portion of the reduced diameter portion 42b. The cam grooves 15 are arranged at equal intervals along the circumferential direction of the reduced diameter portion 42b. Since each cam groove 15 has the same configuration, only one of the cam grooves 15 will be representatively described below.

  The cam groove 15 has an L shape when viewed from the inside of the reduced diameter portion 42b, and is a portion into which the protrusion 721 of the support member 72 is inserted. The cam groove 15 can be divided into a horizontal groove 16 and a vertical groove 17 communicating with the horizontal groove 16.

  The lateral groove 16 extends along the circumferential direction of the reduced diameter portion 42b, and its length is shorter than one round of the inner peripheral surface of the reduced diameter portion 42b. The lateral groove 16 is open to the base end side over the entire length in the longitudinal direction.

  13 (a) to 13 (c), the right end of the horizontal groove 16 communicates with the vertical groove 17 and forms an intersection 18 where the horizontal groove 16 and the vertical groove 17 intersect.

The vertical groove 17 is linear, and extends from the right end of the horizontal groove 16 in FIGS. 13A to 13C in the distal direction. The length of the vertical groove 17 is shorter than the length of the reduced diameter portion 42b in the axial direction. Further, the front end of the vertical groove 17 is not open to the front end side, and a front end inner side surface 171 is formed at the front end of the inner peripheral portion of the vertical groove 17 (FIGS. 11, 12, and 13 (a). ) To (c) and FIG. 20). The base end portion of the vertical groove 17 is the intersection 18 described above. The width and depth of the horizontal groove 16 and the vertical groove 17 are large enough to allow the protrusion 721 to be inserted and move inside. In this embodiment, the horizontal groove 16 and the vertical groove 17 are formed from the inner circumference of the reduced diameter portion 42b to the middle of the thickness direction of the tube wall of the reduced diameter portion 42b. May be formed so as to penetrate from the inner periphery to the outer periphery.

Next, the protrusion 721 will be described.
As shown in FIG. 19, four protrusions 721 are provided on the outer peripheral portion of the base end of the support member 72. Further, the protrusions 721 are arranged at equal intervals along the circumferential direction of the support member 72. Since each protrusion 721 has the same configuration, only one protrusion 721 of them will be described below representatively.

  The protrusion 721 has a quadrangular prism shape and protrudes outward. Further, the protrusion 721 is inserted into the cam groove 15. In the initial state, the protrusion 721 is inserted into the vertical groove 17 and is in contact (engagement) with the inner surface 171 at the front end of the vertical groove 17. This prevents the puncture needle 7 from being detached from the distal end portion of the cylindrical body 2 (the distal end side member 4b) in the initial state.

  Further, the protrusion 721 moves in the longitudinal groove 17 toward the proximal end side in accordance with the movement of the support member 72 in the axial direction from the initial state to the communication state. At this time, the movement of the protrusion 721 in the circumferential direction is restricted by the pair of inner side surfaces 172 facing in the width direction among the inner side surfaces of the vertical groove 17. Thereby, it is possible to prevent the puncture needle 7 from rotating about its axis from the initial state to the communication state. Therefore, coring can be prevented when the proximal needle tip 712 of the double-ended needle 71 penetrates the sealing member 11.

  As shown in FIG. 13 (b), when the double-ended needle 71 and the inner cylinder 3 communicate with each other, the protrusion 721 is located at the base end portion (intersection portion 18) of the longitudinal groove 17, and waits at the intersection portion 18. It has become a state.

  Moreover, when the cover member 6 moves from the second position to the third position, that is, when the outer cylinder 4 rotates, the puncture needle 7 is likely to rotate with the outer cylinder 4. However, when the outer cylinder 4 rotates, the protrusion 721 moves in the lateral groove 16 from the position shown in FIG. 13B to the position shown in FIG. 13C as the outer cylinder 4 rotates. Thereby, it is possible to prevent the rotational force of the outer cylinder 4 from being transmitted to the puncture needle 7. Therefore, it is possible to prevent the puncture needle 7 from rotating in the same direction as the outer cylinder 4, that is, the puncture needle 7 can be brought into a non-rotating state with respect to the outer cylinder 4. In particular, when the outer cylinder 4 rotates, the double-ended needle 71 is in a state of puncturing a living body. The liquid administration device 100 is configured so that the puncture needle 7 does not rotate, thereby preventing the distal end needle tip 711 of the double-ended needle 71 from rotating in the living body. As a result, the user can administer the liquid with minimal invasiveness.

  As shown in FIG. 13A, in the initial state, the engaging portion 723 is located on the distal end side of the longitudinal groove 17. When the puncture needle 7 moves from the initial state toward the proximal end side, the engaging portion 723 enters the longitudinal groove 17, and along with the protrusion 721, the interior of the longitudinal groove 17 toward the proximal end side, as shown in FIG. Move to the indicated position. Further, along with the rotation of the outer cylinder 4, it moves in the lateral groove 16 together with the projection 721 to the position shown in FIG. Thereby, when the outer cylinder 4 rotates, it can prevent that the engaging part 723 and the diameter reducing part 42b interfere, and it can prevent that rotation of the outer cylinder 4 is inhibited. 11 and 12, when the outer cylinder 4 rotates, the engaging portion 723 is a portion where the depth in the lateral groove 16 is shallower than the portion where the protrusion 721 is inserted. It moves in a certain engagement groove 161.

Next, the second rotational force transmission preventing unit 10B will be described.
The second rotational force transmission preventing unit 10 </ b> B includes a protrusion 722 provided on the support member 72 and a hole (concave portion) 623 provided on the cover member 6.

  As shown in FIG. 19, four protrusions 722 are arranged in parallel along the circumferential direction of the support member 72 at equal intervals. Each protrusion 722 has a cylindrical shape and is provided to protrude from the distal end surface 724 of the support member 72 toward the distal end side. Each protrusion 722 is provided at a position eccentric from the central axis of the support member 72.

  As shown in FIGS. 6 and 7, four holes 623 are provided at equal intervals along the circumferential direction of the tip wall 62 of the cover member 6. Each hole 623 has a circular shape when viewed from the central axis direction of the cover member 6, and is formed so as to penetrate in the thickness direction of the tip wall portion 62. Each hole portion 623 may be open to at least the base end side (projection 722 side), and may be formed partway in the thickness direction of the distal end wall portion 62.

  Each hole 623 is arranged at a position corresponding to each protrusion 722 of the support member 72 of the puncture needle 7. Each protrusion 722 is inserted into each hole 623 when the cover member 6 moves to the second position, that is, when the cover member 6 enters a communication state. In this inserted state, each protrusion 722 and each hole 623 engage with each other at a position eccentric from the central axis of the cover member 6. Thereby, it is possible to prevent the puncture needle 7 from rotating around its axis with respect to the cover member 6. Thus, by fixing the puncture needle 7 to the cover member 6 that does not rotate, the non-rotated state of the puncture needle 7 can be reliably maintained.

When the cover member 6 moves to the second position, the protrusion 722 is inserted into the hole 623 up to the middle in the axial direction. Further, when the cover member 6 is moved from the second position to the third position, the insertion of the protrusions 722 into the hole portions 623 is completed. In the liquid administration device 100, the first rotational force transmission is prevented. The synergistic effect of the part 10A and the second rotational force transmission preventing part 10B can more reliably prevent the puncture needle 7 from rotating when the double-ended needle 71 is puncturing a living body.

  Further, as shown in FIGS. 6 and 7, each hole 623 has a tapered portion 624 whose inner diameter is increased toward the base end side (projection 722 side). Thus, the protrusion 722 is guided by the tapered portion 624 when inserted into the hole 623. When the protrusion 722 is guided to the tapered portion 624, the protrusion 722 slides on the inclined inner surface facing the tapered portion 624 toward the distal end side and reaches the hole 623. As described above, the taper portion 624 functions as a guide portion that guides the protrusion 722 into the hole portion 623.

  Next, a method of using the liquid administration device 100 and an operating state at the time of use will be described with reference to FIGS. 1, 2, and 10 to 23.

  [1] As shown in FIGS. 1 and 6, a liquid administration device 100 in an unused state (initial state) is prepared. In the unused liquid administration device 100, the cover member 6 is in the first position and covers the tip side needle tip 711 of the double-ended needle 71. In this unused state, the state in which the tip side needle tip 711 of the double-ended needle 71 is covered with the cover member 6 by the urging force of the coil spring 13 is maintained. Thereby, the erroneous puncture by the front end side needle tip 711 of the double-ended needle 71 can be reliably prevented.

  In the puncture needle 7, the proximal end needle tip 712 of the double-ended needle 71 is separated from the sealing member 11 of the inner cylinder 3 of the cylindrical body 2, and the sealing member 11 has not yet been pierced. Thereby, the aseptic state of the liquid can be maintained until the administration of the drug solution is started.

Moreover, each protrusion 63 of the cover member 6 is located at the position shown in FIG.
Further, each projection 613 of the cover member 6 is located on the proximal end side of the groove 43 b at the distal end portion of the outer cylinder 4.

  Further, each step portion 516 of the pusher 51 is in contact with or in contact with the inclined surface 491a of each projection 49a of the outer cylinder 4 (may be separated before use), that is, engaged with each projection 49a. Or it exists in the position which can be engaged, and the movement to the front-end | tip direction of the operation member 5 with respect to the inner side structure 1 (cylinder 2) is prevented.

  Further, the protrusion 63 is inserted into the linear groove 421, thereby preventing the outer cylinder 4 from rotating with respect to the cover member 6, whereby the outer cylinder 4 is prevented from rotating with respect to the operation member 5. Rotation is prevented.

  Further, the protrusion 721 of the puncture needle 7 is located at the tip of the longitudinal groove 17 as shown in FIGS. 11 and 13A.

  [2] Next, as shown in FIG. 2, the operation member 5 of the liquid administration device 100 in an unused state is gripped, the distal end wall portion 62 of the cover member 6 is brought into contact with the living body, and the operation member 5 is moved to the distal end. Press toward the direction. Thereby, the cover member 6 moves against the operating member 5 and the inner structure 1 in the proximal direction, that is, from the first position to the second position against the urging force of the coil spring 13. Further, in the movement process, the distal end wall portion 62 of the cover member 6 moves the support member 72 of the puncture needle 7 to the proximal end portion side.

  At this time, the distal end needle tip 711 of the double-ended needle 71 protrudes from the opening 621 of the distal end wall portion 62 of the cover member 6, and puncture of the living body is performed with the distal end needle tip 711. As described above, each engaging portion 723 engages with the edge portion of the distal end opening 421b of the reduced diameter portion 42b, so that it is possible to reliably puncture the living body with the double-ended needle 71.

  Further, the distal end wall portion 62 presses the support member 72 of the puncture needle 7 toward the proximal direction. Thereby, the proximal end needle tip 712 of the double-ended needle 71 can pierce the sealing member 11 of the inner cylinder 3, and thus the double-ended needle 71 punctured with the living body and the inner cylinder 3 communicate with each other.

  At this time, the protrusion 63 of the cover member 6 moves in the proximal direction relative to the outer cylinder 4 along the linear groove 421. When the cover member 6 is in the second position, the protrusion 63 of the cover member 6 is located at the position shown in FIG.

  At this time, each projection 613 of the cover member 6 moves in the proximal direction along each groove 43b of the outer cylinder 4 and is located in each space 45b on the proximal end side of each groove 43b.

  Further, each projection 722 of the puncture needle 7 is inserted into each hole 623 of the cover member 6, thereby preventing the puncture needle 7 from rotating in the circumferential direction.

  Further, the protrusion 63 is located at the base end portion of the linear groove 421, whereby the outer cylinder 4 can be rotated with respect to the cover member 6. Can be rotated.

  Further, the protrusion 721 of the support member 72 is located at the intersection 18 between the horizontal groove 16 and the vertical groove 17 as shown in FIG.

  [3] Next, when the operation member 5 is continuously pressed in the distal direction from the state shown in FIG. 2, the cover member 6 reaches the third position as shown in FIGS. 3 and 7. This is a state in which the outer cylinder 4 has finished rotating by a predetermined angle with respect to the cover member 6 and the inner cylinder 3 due to the groove 42 of the outer cylinder 4 and the protrusion 63 of the cover member 6.

  At this time, the stepped portion 516 of the pusher 51 moves along the inclined surface 491a of the protrusion 49a, and at this time, the outer cylinder 4 obtains a propulsive force in the rotational direction. Further, the outer cylinder 4 obtains a propulsive force in the rotational direction by the urging force in the rotational direction of the coil spring 9. Thereby, the outer cylinder 4 can be rotated easily.

  Thereby, each level | step-difference part 516 of the pusher 51 moves to the position shifted | deviated from each processus | protrusion 49a of the outer cylinder 4, and the state with which each processus | protrusion part 516 and each processus | protrusion 49a were disengaged. As a result, the operation member 5 can move in the distal direction relative to the cylindrical body 2. Thereafter, the state in which the engagement between each stepped portion 516 and each projection 49a is disengaged is maintained, and thus the following description is omitted.

  As one continuous operation, the puncture operation of the double-ended needle 71 into the living body, the rotation operation of the outer cylinder 4 and the pressing operation of the operation member 5 described later can be smoothly performed.

  Further, the protrusion 63 of the cover member 6 moves obliquely upward relative to the outer cylinder 4 along the inclined groove 422. When the cover member 6 is in the third position, the protrusion 63 of the cover member 6 is located at the position shown in FIG.

  At this time, each protrusion 613 of the cover member 6 is rotated and moved to a position on the base end side of each long hole 44b in each space 45b.

  When the outer cylinder 4 rotates, the protrusion 721 of the support member 72 moves from the position shown in FIG. 13B to the position shown in FIG. That is, the support member 72 and the outer cylinder 4 rotate relatively. Thereby, it is possible to prevent the rotational force of the outer cylinder 4 from being transmitted to the puncture needle 7. Therefore, it is possible to prevent the double-ended needle 71 from rotating together with the outer cylinder 4 in a state where the living body is punctured.

  Further, the protrusion 722 of the support member 72 is inserted into the hole 623 of the cover member 6, whereby the puncture needle 7 is fixed to the cover member 6 that does not rotate with respect to the outer cylinder 4. Thereby, it is possible to more reliably prevent the rotational force of the outer cylinder 4 from being transmitted to the puncture needle 7.

  [4] As shown in FIGS. 3, 7, and 12, the pressing force of the user and the biasing force of the coil spring 9, that is, the auxiliary force ( Due to the pressing force), the operating member 5 moves in the distal direction, so that the gasket 8 can move in the distal direction. That is, the above-described pressing operation is performed, so that liquid can be administered. Then, as shown in FIGS. 4 and 8, the gasket 8 comes into contact with the bottom 32 of the inner cylinder 3, the liquid administration is completed, and the cover member 6 is located at the fourth position.

  At this time, the protrusion 63 of the cover member 6 remains located at the position shown in FIG.

  Further, the protrusions 613 of the cover member 6 also remain in positions at the base end side of the long holes 44b in the spaces 45b.

  In addition, each claw 47 a of each arm portion 46 a of the outer cylinder 4 is inserted into each hole 517 of the pusher 51 and engaged with each hole 517. At this time, each arm portion 46a is curved at one end, and at the moment when each claw 47a projects in the proximal direction from each hole portion 517, it returns to its original shape by its elastic force, and sounds (audible sound) from each arm portion 46a. ) And vibration (click feeling). Thereby, the user can recognize that the administration of the liquid is completed.

  Further, after use, the outer cylinder 4 and the operation member 5 are fixed by the engagement of the claws 47a and the holes 517. Thereby, while being able to control the action | operation of the operation member 5 after use, the user can recognize that it is an administration completion state.

  [5] Next, as shown in FIGS. 5, 9, and 10, the pressing of the operation member 5 toward the distal direction is stopped, the distal end wall portion 62 of the cover member 6 is separated from the living body, and the double-ended needle 71 is removed from the living body.

  Accordingly, the cover member 6 is moved in the distal direction by the urging force of the coil spring 13, that is, the cover member 6 is moved to the fifth position, and the distal end needle tip 711 of the double-ended needle 71 is covered with the cover member.

  Further, the projections 613 of the cover member 6 are engaged with the base end portion of the long hole 44 b, so that the cover member 6 is prevented from moving in the base end direction with respect to the outer cylinder 4. The state where the tip side needle tip 711 of the double-ended needle 71 is covered is maintained. Thereby, since the cover member 6 cannot move in the proximal direction, it functions as a safety mechanism for preventing a needle stick accident after use.

  Further, as the outer cylinder 4 rotates relative to the cover member 6, each projection 613 of the cover member 6 engages with the elongated hole 44 b from the groove 43 b (initial state) of the outer cylinder 4, and the safety mechanism By functioning, it is harder to return to the initial state than the straight type, and the state before and after use is easy to understand, so that reuse can be prevented. Furthermore, the used liquid administration device 100 can be safely and reliably discarded without making a mistake with the liquid administration device 100 before use.

  Further, the projection 63 of the cover member 6 moves in the distal direction relative to the cover member 6 along the linear groove 423, and when the cover member 6 is in the fifth position, the projection 63 of the cover member 6 Is located at a position shown in FIG.

  Thus, according to the liquid administration device 100, when the outer cylinder 4 rotates, it is possible to reliably prevent the rotational force from being transmitted to the puncture needle 7. Thereby, it can prevent that the double-ended needle 71 rotates in the state which punctured the biological body. Therefore, the user can administer the liquid without damaging the living tissue.

  Further, the urging force of the coil spring 9, that is, the assisting force, can assist the movement of the operation member 5 in the distal direction. Thereby, for example, even when a relatively thin double-ended needle 71 is used or a liquid with a relatively high viscosity is administered, the liquid can be easily and reliably administered. Even a user who has difficulty in pressing the operation member 5 such as a rheumatic patient having a finger or a pain can easily and reliably administer the liquid.

Second Embodiment
21 and 22 are longitudinal sectional views showing an operating state of the liquid administration device according to the second embodiment of the present invention in use, and FIG. 23 shows a cover member of the liquid administration device according to the second embodiment of the present invention. FIG. In the following, the upper side in FIGS. 21 to 23 is “base end (rear end)” or “upper (upper)”, the lower side is “tip” or “lower (lower)”, and the vertical direction is “axial direction”. "Or" longitudinal direction ".

  Hereinafter, the second embodiment will be described with a focus on the differences from the first embodiment described above, and the description of the same matters will be omitted.

  As shown in FIG. 23, in the liquid administration device 100 according to the second embodiment, a pair of arms 615 are disposed on the outer periphery of the base end of the cover member 6 so as to face each other via the central axis of the cover member 6. Since each arm 615 has the same configuration, one arm 615 will be representatively described below.

  The arm 615 has a long shape and is formed to protrude to the proximal end side. A pair of claw portions 616 that are opposed to each other are provided at the base end portion of the arm 615. The claw portion 616 is formed so as to protrude inward. Further, the tip of the arm 615 has a step 617 at the boundary with the side wall 61 of the cover member 6.

  Further, a rib 522 that protrudes inward is provided on the inner peripheral portion of the distal end of the grip portion 52 of the operation member 5. The rib 522 is formed over the entire circumference of the inner peripheral portion of the grip portion 52. The rib 522 is engaged with the step portion 617 of the cover member 6 in the initial state shown in FIG. Thereby, it is possible to prevent the cover member 6 from being detached from the operation member 5.

  Further, a pair of engaging arms 533 projecting toward the distal end side are provided on the inner peripheral portion of the head 53. Since each engagement arm 533 has the same configuration, one engagement arm 533 will be representatively described below.

  The engagement arm 533 has a long shape, and an engagement claw 534 protruding outward is formed at the tip. The engaging claw 534 engages with the claw portion 616 of the cover member 6 in the safety mechanism operating state shown in FIG. Accordingly, the movement of the cover member 6 in the distal direction relative to the operation member 5 due to the biasing force of the coil spring 13 is prevented from the operating state of the safety mechanism shown in FIG. Accordingly, it is possible to prevent the cover member 6 from being detached from the operation member 5. As a result, the operating state of the safety mechanism can be reliably maintained.

<Third Embodiment>
24 to 26 are side views showing an operating state when the third embodiment of the liquid administration device of the present invention is used. In the following, the upper side in FIGS. 24 to 26 is “base end (rear end)” or “upper (upper)”, the lower side is “tip” or “lower (lower)”, and the vertical direction is “axial direction”. "Or" longitudinal direction ".

  Hereinafter, the third embodiment will be described with a focus on differences from the second embodiment described above, and description of similar matters will be omitted.

  As shown in FIGS. 24 to 26, in the liquid administration device 100 of the third embodiment, a pair of windows 523 that allow the inside of the liquid administration device 100 to be visually recognized are formed on the outer peripheral portion of the grip portion 52 of the operation member 5. Has been. The window portion 523 has a rectangular shape with the central axis direction as a longitudinal direction in a side view of the grip portion 52. The window portion 523 is configured by a through hole that penetrates from the inner periphery to the outer periphery of the grip portion 52. The base end of the window portion 523 substantially coincides with the base end of the grip portion 52, and the tip end of the window portion 523 is located at the tip end portion of the grip portion 52.

  The window portion 523 is formed at a position corresponding to the pair of arms 615 (base end portions) of the cover member 6. Thereby, the user can visually recognize the cover member 6 that moves in accordance with the administration state of the liquid through the window portion 523.

  For example, in the initial state shown in FIG. 24, the base ends of the pair of arms 615 of the cover member 6 are in a state of being separated from the engagement arms 533 of the head 53. In the administrable state shown in FIG. 25, the tip of the engaging arm 533 of the head 53 and the arm 615 of the cover member 6 are overlapped. In the administration completion state shown in FIG. 26, the proximal end of the arm 615 of the cover member 6 overlaps the distal end of the head 53.

  Thus, in the liquid administration tool 100 of this embodiment, the position of each cover member 6 visually recognized through each window part 523 is comprised so that the state of liquid administration may be shown. Thereby, the user can grasp | ascertain the administration condition of a liquid easily.

  The liquid administration device of the present invention has been described based on the illustrated embodiment, but the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. can do. In addition, any other component may be added to the present invention.

  Further, the present invention may be a combination of any two or more configurations (features) of the above embodiments.

  In each of the above embodiments, the support member is provided with a follower portion and the distal end side member is provided with a cam groove. However, the present invention is not limited thereto, and the support member is provided with a cam groove, and the distal end side is provided. The member may be provided with a follower portion.

  Moreover, in each said embodiment, although the convex part is provided in the supporting member and the recessed part is provided in the cover member, in this invention, it is not limited to this, A recessed part is provided in a supporting member, and a convex part is provided in a cover member. May be provided.

  Moreover, in each said embodiment, although a rotational force transmission prevention mechanism has both a 1st rotational force transmission prevention part and a 2nd rotational force transmission prevention part, it is not limited to this in this invention. One of the first rotational force transmission preventing unit and the second rotational force transmission preventing unit may be omitted.

  Moreover, in the said 3rd Embodiment, although the window part is comprised with the through-hole, in this invention, it does not specifically limit, For example, the light-transmitting material which has a light transmittance of the grade which a grip part can visually recognize an inside It may be comprised. In this case, it is only necessary that at least a portion corresponding to the through hole is made of a light transmissive material, and the entire gripping portion may be made of a light transmissive material.

  Moreover, in the said 3rd Embodiment, you may attach | subject a scale to the edge part of a window part along the longitudinal direction.

  Further, in each embodiment, the puncture needle has a needle tube that is a double-ended needle, but the present invention is not limited to this, and has a needle tube in which the proximal end side needle tip is omitted. Also good.

  In each embodiment, the cylinder is preliminarily filled with the liquid. However, the present invention is not limited to this. For example, the cylinder is not initially filled with the liquid, and the cylinder is filled later. It may be filled and used.

  In each embodiment, the biasing member is a compression spring. However, in the present invention, the biasing member is not limited to this, and may be, for example, a tension spring or the like, or may be other than a spring.

  Further, in each embodiment, the cylinder body on which the gasket slides is configured by two members, an inner cylinder and an outer cylinder. However, in the present invention, the present invention is not limited to this. For example, the cylindrical body is configured by one member. May be.

  In the present invention, the gasket may be omitted. In this case, for example, the tip of the pusher is configured to function as a gasket.

DESCRIPTION OF SYMBOLS 100 Liquid administration tool 1 Inner structure 2 Cylinder 3 Inner cylinder 31 Inner cylinder main body 32 Bottom 33 Side wall 34 Mouth part 4 Outer cylinder 41 Trunk part 42 Groove 421, 423 Linear groove 422 Inclined groove 43 Support part 4a Base end side member 40a Projection part 41a Arm part 42a Claw 45a Reduced diameter part 46a Arm part 47a Claw 49a Projection 491a Inclined surface 4b Tip side member 41b Hole part 42b Reduced diameter part 421b Tip opening 43b Groove 44b Long hole 45b Space 5 Operating member 51 Pusher 5 Part 512 flange 513 rib 5131 groove 514 arm part 515 claw 516 step part 517, 518 hole part 52 grip part 521 hole part 522 rib 523 window part 53 head part 531 arm part 532 claw 533 engaging arm 534 engaging claw 6 cover member 61 Side wall 612 Arm part 613 Protrusion 614 Rib 615 Arm 616 Claw part 617 Stepped portion 62 Tip wall portion 621 Opening portion 622 Tip surface 623 Hole portion 624 Taper portion 63 Protrusion 7 Puncture needle 71 Double needle 711 Tip needle tip 712 Proximal needle tip 72 Support member 721 Projection (follower portion)
722 Protrusion (convex part)
723 Engaging portion 724 Tip surface 8 Gasket 81 Protruding portion 82 Recessed portion 9 Coil spring 90 Coil spring body 91, 92 Hook 10 Rotational force transmission preventing mechanism 10A First rotational force transmission preventing portion 10B Second rotational force transmission preventing portion 11 Sealing Member 12 Fixing member 13 Coil spring 15 Cam groove 16 Horizontal groove 161 Engaging groove 17 Vertical groove 171 Tip inner surface 172 Inner surface 18 Intersection 40 Auxiliary mechanism

Claims (11)

An inner cylinder that can be filled with liquid;
A puncture member that is disposed at the distal end of the inner cylinder, has a sharp needle tip at the distal end, can communicate with the inner cylinder, and a support member that supports the needle tube;
An operation member that performs a discharge operation of discharging the liquid from the needle tube in a state where the needle tube and the inner cylinder communicate with each other by moving toward the distal direction;
A cover member movable between at least a position (A) covering the needle tip and a position (B) at which the needle tip is exposed;
It is disposed on the outer peripheral side of the inner cylinder, is provided rotatably about the central axis of the inner cylinder with respect to the cover member, and until the cover member moves to the position (B), An outer cylinder that prohibits movement of the operating member, rotates when the cover member is positioned at the position (B), and releases the prohibition of movement of the operating member;
A liquid administration device comprising: a rotational force transmission preventing mechanism for preventing rotational force from being transmitted to the needle tube when the outer cylinder rotates. The support member has a cylindrical shape and is provided to be rotatable with respect to the outer cylinder.
The rotational force transmission preventing mechanism is provided on one of the outer cylinder and the support member, and is formed to protrude from the other cam groove having a lateral groove extending in the circumferential direction thereof, with the rotation of the outer cylinder. The liquid administration device according to claim 1, further comprising a follower portion that moves in the lateral groove. The support member is provided so as to be movable together with the needle tube in the direction of the rotation axis with respect to the outer cylinder, and the needle tube communicates with the inner cylinder by the movement.
The rotational force transmission preventing mechanism is provided in communication with the lateral groove, extends in the direction of the rotation axis, and has a vertical groove in which the follower portion moves as the support member moves in the direction of the rotation axis. The liquid administration device according to claim 2.   The state according to claim 3, wherein, in a state where the needle tube and the inner cylinder are not yet communicated with each other, the support member is prevented from being detached from the outer cylinder by engaging the follower portion and the longitudinal groove. Liquid dosing device. The support member has a cylindrical shape and is provided to be rotatable with respect to the outer cylinder.
The rotational force transmission preventing mechanism is provided on one of the support member and the cover member on a convex portion provided eccentric from the rotation shaft, and on the other, and the cover member is located at the position (B). The liquid administration device according to any one of claims 1 to 4, further comprising a concave portion into which the convex portion is inserted.   The liquid administration device according to claim 5, wherein the concave portion has a tapered portion whose inner diameter is increased toward the convex portion. The support member has a cylindrical shape, is provided so as to be movable in the direction of the rotation axis, and has an engagement portion formed to protrude from the outer peripheral portion,
In the initial state where the discharge operation has not yet been performed, the needle tube and the inner cylinder are not in communication with each other,
The liquid administration according to any one of claims 1 to 6, wherein when the needle tip punctures a living body, the engagement portion is engaged with the outer cylinder to temporarily maintain the non-communication state. Ingredients.   The liquid administration device according to claim 7, wherein the engaging portion has a dome shape.   The liquid administration device according to claim 7 or 8, wherein the outer cylinder is provided along a circumferential direction thereof and has an engagement groove through which the engagement portion moves when the outer cylinder rotates. An urging member for urging the cover member toward the distal direction with respect to the inner cylinder;
The engagement of the cover member and the operation member prevents movement of the cover member in the distal direction with respect to the operation member due to the urging force of the urging member. A liquid administration device according to 1. The operation member is disposed on an outer peripheral side of the cover member, and includes a gripping portion that is gripped when the operation member is operated.
The grip portion has a window portion through which a base end portion of the cover member can be visually recognized,
The position of the base end part of the cover member visually recognized through the said window part during the said discharge operation is comprised so that the state of administration of the said liquid may be shown. Liquid dosing device.

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