JP2015047478A - Liquid administration tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid administration tool that facilitates securement of safety after administration of a liquid.SOLUTION: A liquid administration tool 10 comprises: a body part 20 that is provided with a needle tube 61 for administering a liquid, in a manner capable of protruding; and a cap 30 that is detachably attached to the body part 20 so as to cover a protruding portion of the needle tube 61. The cap 30 includes a cap engagement part 33 that does not engage with a base-end side engagement part 43 provided at the body part 20 in a first state before the administration of the liquid and can engage with the base-end side engagement part 43 by linearly moving to the body part 20 in a base-end direction in a second state after the administration.

Description

  The present invention relates to a liquid administration device.

  Conventionally, a prefilled syringe filled with a liquid in advance is known. A prefilled syringe normally contains a liquid and is slidable in a syringe outer cylinder in which a discharge port for discharging the liquid is formed at the tip, a needle tube provided in the discharge port of the syringe outer cylinder, and the syringe outer cylinder A gasket, a pusher for pressing the gasket in the distal direction, and a cap that covers the needle tube. When using such a prefilled syringe, first, the cap is removed to expose the needle tube, and the needle tube is punctured into the living body, and then the pusher is pressed to advance the gasket in the syringe outer cylinder. Thereby, the liquid in the syringe outer cylinder is pushed out via the needle tube, and the liquid is administered into the living body. After that, the cap is put on the needle tube again to ensure safety.

  By the way, a prefilled syringe is also used when a patient self-administers at home. However, the operation may be difficult when elderly people and women with weak power, patients with rheumatism with pain and deformation of fingers, and the like self-administer. Moreover, although it is necessary to collect | recover a used prefilled syringe as medical waste, even if it covers a cap after use, it is also considered that a cap removes again.

  Thus, for example, Patent Document 1 describes a drug delivery device in which a syringe outer tube and a needle tube are maintained inside a structure by a biasing force of a spring. When using this drug delivery device, the cap attached to the opening from which the needle tube of the structure protrudes is removed, the structure is pressed against the living body, and the structure is pressed with the palm of the hand. As a result, the needle tube protrudes from the structure and is punctured into the living body, the pusher moves in the distal direction, and the drug is administered into the living body through the needle tube. Thereafter, by releasing the pressure on the structure, the needle tube is accommodated in the structure again by the biasing force of the spring. In this way, the drug delivery device has a structure that is easy to operate and highly safe.

Special table 2013-508032 gazette

  However, in the drug delivery device described in Patent Document 1, the used needle tube is accommodated in the structure, but the opening from which the needle tube protrudes is not covered. For this reason, after use, it is necessary to store it in a dedicated disposal box or the like, and to transport it to a hospital or the like. It also takes time to obtain the disposal box again, and the effort to ensure safety is complicated.

  The present invention solves the above-described problems, and an object thereof is to provide a liquid administration device that can easily ensure safety after use.

  The liquid administration device according to the present invention that achieves the above object is provided with a main body part that can project a needle tube for administering a liquid, and is removable from the main body part so as to cover a portion from which the needle tube projects. A liquid administration device having a protective member attached in advance, wherein the main body has a container capable of containing a liquid therein, and a needle tip at a distal end thereof, and a proximal end can communicate with the inside of the container. A structure having a simple needle tube, and movable in the distal direction relative to the structure, so that the first state before moving in the distal direction becomes the second state after moving in the distal direction. An operation member that reduces the internal volume of the container by performing a pressing operation and discharges the liquid from the needle tube, and is biased in the distal direction with respect to the structure to surround the outer periphery of the needle tube, An opening is formed and is opposed to the structure. A cover member that protrudes in the distal direction from the opening by moving in the proximal direction, and the protection member is a first engagement portion provided in the main body in the first state. And a second engagement portion that is engageable with the first engagement portion by linearly moving in the proximal direction with respect to the main body portion in the second state.

  In the liquid administration device configured as described above, the protective member can be easily removed from the main body portion because the second engagement portion does not engage the first engagement portion in the first state before the liquid is discharged. In the second state after the liquid is discharged, the protective member can be firmly attached to the main body portion by engaging the second engaging portion with the first engaging portion. Therefore, it is possible to effectively use the protective member removed before use, firmly connect the protective member to the main body after use, and more reliably prevent erroneous puncture of the used needle tube, ensuring safety after use. Becomes easy.

It is a perspective view which shows the liquid administration tool which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the liquid administration tool in alignment with the AA line of FIG. 1 in the initial state in which the cap was attached to the main-body part. It is a longitudinal cross-sectional view of the liquid administration tool in alignment with the AA line of FIG. 1, (A) is the state which removed the cap, (B) is the state which punctured the living body, and (C) is the liquid administration to a biological body. Shows the state. It is a longitudinal cross-sectional view of the liquid administration tool in alignment with the AA line of FIG. 1, (A) shows the state which accommodated the needle tube in the cover member, (B) shows the state which mounted | wore the cap again. It is a longitudinal cross-sectional view of the liquid administration tool in alignment with the BB line of FIG. 1 for demonstrating an operation member fixing mechanism, (A) is the state which removed the cap, (B) is the state which punctured the living body with the needle tube, (C) shows a state in which a liquid is administered to a living body. It is a longitudinal cross-sectional view of the liquid administration tool along CC line of FIG. 1 for demonstrating a safety mechanism, (A) is the state which removed the cap, (B) is the state which administered the liquid to the biological body, (C ) Shows a state in which the needle tube is accommodated in the cover member. It is a perspective view which shows the liquid administration tool which concerns on 2nd Embodiment. It is a perspective view which shows the cover member of the liquid administration tool which concerns on 2nd Embodiment. It is a figure for demonstrating operation | movement of the liquid administration device which concerns on 2nd Embodiment, (A) is a longitudinal cross-sectional view which follows the EE line | wire of FIG. 7 in the initial state with which the cap was attached to the main-body part, (B ) Is a longitudinal sectional view taken along line FF in FIG. 7 with the cap removed, and FIG. 8C is a longitudinal sectional view taken along line FF in FIG. 7 with the needle tube punctured into the living body. It is a longitudinal cross-sectional view of the liquid administration tool in alignment with the FF line of FIG. 7, (A) is the state which administered the liquid to the biological body, (B) is the state which accommodated the needle tube in the cover member, (C) is a cap. It shows the state of wearing again. It is a perspective view which shows the liquid administration tool which concerns on 3rd Embodiment. It is a figure for demonstrating operation | movement of the liquid administration device which concerns on 3rd Embodiment, (A) is a longitudinal cross-sectional view which follows the HH line | wire of FIG. 11 in the initial state with which the cap was attached to the main-body part, (B ) Is a longitudinal sectional view taken along line II in FIG. 11 with the cap removed, and FIG. 11C is a longitudinal sectional view taken along line II in FIG. 11 with the needle tube being punctured into the living body. It is a perspective view which shows the modification of the liquid administration tool which concerns on 1st Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the dimension ratio of drawing is exaggerated on account of description, and may differ from an actual ratio. In the following description, the operation side (pressing side) of the liquid administration device is referred to as “base end side”, and the liquid administration side (side from which the needle tube protrudes) is referred to as “distal end side”.
<First Embodiment>

  A liquid administration device 10 according to the first embodiment shown in FIGS. 1 and 2 is a medical instrument for administering a liquid into a living body. The liquid to be administered is appropriately selected depending on the purpose of use, but for example, hematopoietics, vaccines, hormone preparations, anti-rheumatic agents, anti-cancer agents, anesthetics, anticoagulants, gelled preparations, etc. Examples include drugs that are injected.

  The liquid administration device 10 includes a main body 20 that is used for liquid administration, and a cap 30 (protective member) that is removed from the main body 20 when the liquid is administered. The main body 20 is movable with respect to the structure 21 (lower housing) that stores liquid therein, an operation member 40 (upper housing) for performing an operation of discharging liquid from the structure 21, and the structure 21. The cover member 50 is provided, the first coil spring 22 that urges the cover member 50 in the distal direction, and the second coil spring 23 that applies a force that moves the operation member 40 relative to the structure 21. .

  The structure 21 includes a cylindrical syringe 60 (container) that can accommodate a liquid therein, a needle tube 61 attached to the tip of the syringe 60, and a gasket 62 that is slidably disposed with respect to the inside of the syringe 60. And an inner member 70 that is disposed on the outer periphery of the syringe 60 and supports the syringe 60, and an outer member 80 that is disposed outside the inner member 70.

  The syringe 60 has a proximal end opening 63 formed on the proximal end side and a discharge port 64 through which liquid passes on the distal end side. The needle tube 61 is fixed to the distal end of the syringe 60 so that the internal flow path communicates with the discharge port 64 of the syringe 60, and a sharp needle tip is formed at the distal end. The gasket 62 is disposed so as to be slidable along the axial direction of the syringe 60 while being in close contact with the inner wall surface 65 of the syringe 60 and maintaining liquid tightness. By moving the gasket 62 in the distal direction inside the syringe 60, the liquid in the space defined by the syringe 60 and the gasket 62 can be discharged from the needle tube 61 through the discharge port 64 of the syringe 60.

  The inner member 70 is formed with a support hole 71 surrounding the outer periphery of the syringe 60, and the syringe 60 is fitted into the support hole 71 so that the syringe 60 is supported.

  The outer member 80 is formed so as to surround the outer periphery of the inner member 70 and constitutes a part of the outer peripheral surface of the structure 21. The syringe 60, the inner member 70, and the outer member 80 are connected or bonded to each other and have a structure that moves integrally.

  The operating member 40 includes a pressing portion 41 for a user to press, a pusher 42 connected to the gasket 62, and two proximal-side engaging portions 43 extending from the pressing portion 41 in the distal direction. ing.

  The pressing portion 41 is formed in a cylindrical shape that is open at the distal end side and closed at the proximal end side, and has a cylindrical pressing cylindrical portion 45 that surrounds the outer peripheral surface of the outer member 80, and a proximal end side of the pressing cylindrical portion 45. And a pressing base end portion 46 formed in a planar shape so as to close the opening. The pressing cylinder 45 is slidable with the outer peripheral surface of the outer member 80.

  The pusher 42 extends from the center of the inner surface of the pressing base end portion 46 toward the distal end, and a convex portion 42A to which the gasket 62 is connected is formed at the distal end.

  The two proximal end side engaging portions 43 are positioned so as to face each other with the pusher 42 interposed therebetween, and both extend in the distal direction. At the tip of each base end side engaging portion 43, a base end side claw portion 44 that protrudes away from each other (outward in the radial direction of the operation member 40) is formed. 44 A of 2nd inclined surfaces are formed in the front end surface of each base end side nail | claw part 44 so that it may incline to a base end side toward the radial direction outer side. And the base end side nail | claw base end surface 44B which is a base end surface of each base end side nail | claw part 44 is formed with the angle (alpha) with respect to the site | part extended from the base end part 46 for a press at about 90 degree | times. .

  The cover member 50 includes a cylindrical cover tube portion 51 and a flat cover tip portion 52 formed so as to close the opening on the front end side of the cover tube portion 51. The cover cylinder portion 51 is slidable with the inner peripheral surface of the outer member 80. The first coil spring 22 is disposed inside the cover member 50, the distal end portion of the first coil spring 22 is in contact with the inner surface of the cover distal end portion 52, and the proximal end portion is in contact with the inner member 70 of the structure 21. . The first coil spring 22 is disposed in a contracted state in the axial direction, and thereby urges the cover member 50 in the distal direction. At the base end of the cover member 50, a return portion 53 that protrudes outward in the radial direction is formed. The cover member 50 is movable in the proximal direction while contracting the first coil spring 22 so as to be accommodated in a space formed between the inner member 70 and the outer member 80, and moves in the proximal direction. From this state, the first coil spring 22 contracted can be moved in the distal direction by the elastic force (restoring force) of the first coil spring 22. When the cover member 50 moves in the distal direction, the return portion 53 is caught by the protruding portion 81 formed on the inner side surface of the outer member 80, and the protrusion of the structure 21 beyond the predetermined position is restricted. A needle passage hole 54 (opening) through which the needle tube 61 can project is formed on the central axis of the cover member 50 at the cover front end portion 52 of the cover member 50. An engaging portion insertion hole 55 (insertion hole) is formed. When the cover member 50 moves in the proximal direction relative to the structure 21, the needle passage hole 54 allows the needle tube 61 to pass therethrough and project in the distal direction. The two engaging portion insertion holes 55 are holes for allowing a cap engaging portion 33 (second engaging portion), which will be described later, to pass through, and on the extension line of the two base end side engaging portions 43 of the operation member 40. positioned.

  The cap 30 includes a cylindrical cap cylinder portion 31, a planar cap distal end portion 32 formed so as to close an opening on the distal end side of the cap cylinder portion 31, and a needle tip side cap 35. The cap distal end portion 32 includes two cap engaging portions 33 (second engaging portions) extending in the proximal direction from the inner surface of the cap distal end portion 32. The two cap engaging portions 33 are positioned so as to face each other with the central axis of the cap 30 therebetween, and both extend in the proximal direction. At the base end of each cap engaging portion 33, a cap claw portion 34 protruding in a direction approaching each other (inner radial direction of the cap 30) is formed. A first inclined surface 34 </ b> A is formed on the proximal end surface of each cap claw portion 34 so as to be inclined toward the distal end side in the radially inner side. The cap claw tip end face 34B, which is the base end face of each cap claw 34, is formed with an angle β of approximately 90 degrees with respect to the portion extending from the cap tip 32. The cap 30 can be mounted from the front end side of the cover member 50 so as to cover the outer peripheral surface of the cover member 50. When the cap 30 is mounted, the cap engagement portion 33 passes through the engagement portion insertion hole 55 of the cover member 50. The base end of the cap cylinder portion 31 comes into contact with the distal end surface of the outer member 80 while reaching the inside of the structure 21.

  The needle tip side cap 35 includes a bottomed cylindrical housing 36 and an elastic body 37 provided on the inner peripheral surface of the housing 36. The needle tip side cap 35 is fixed to the proximal end surface of the cap distal end portion 32 so that the opening portion faces the proximal end direction. When the cap 30 is attached to the cover member 50, the needle tip of the needle tube 61 reaches the housing 36 and contacts the elastic body 37. Thereby, the needle tip side cap 35 plays a role of protecting the needle tip of the needle tube 61 and sealing the distal end opening of the needle tube 61.

  Then, when the cap 30 is attached to the cover member 50 in a state where the operation member 40 has moved in the distal direction relative to the structure 21 to a position covering the outer peripheral surface of the outer member 80 (see FIG. 4B). The cap engaging portion 33 passes through the engaging portion insertion hole 55, and the first inclined surface 34A of the cap claw portion 34 is deformed while sliding against each other in contact with the second inclined surface 44A of the proximal end side claw portion 44, The cap claw part 34 gets over the base end side claw part 44 and moves to the base end side from the base end side claw part 44, and the cap claw part distal end surface 34B and the base end side claw base end face 44B come into contact with each other. At this time, since the angle β of the cap claw tip end face 34B is approximately 90 degrees and the angle α of the base claw base end face 44B is approximately 90 degrees, the cap claw tip end face 34B and the base end claw Almost no force acts in the direction of sliding between the base end surfaces 44B (the direction orthogonal to the axial direction), and the cap claw portion 34 and the base end side claw portion 44 engage with each other so as not to be detached. Note that the values of the angle α and the angle β are not limited as long as they can generate a force that prevents disengagement by engaging with each other, and may be less than 90 degrees or more than 90 degrees. However, if the angle α and the angle β are 90 degrees or less, the cap claw portion distal end surface 34B and the proximal end side claw portion proximal end surface 44B are difficult to slip, and the engagement force is increased. Further, although not particularly limited, the cap claw distal end surface 34B and the proximal end claw proximal end surface 44B are difficult to slip, and the surface of the cap claw distal end surface 34B and the proximal end claw proximal end surface 44B in order to increase the engagement force. There may be small irregularities. Alternatively, there may be a protrusion having a shape that meshes with the cap claw portion distal end surface 34B and the proximal end claw portion proximal end surface 44B.

  The liquid administration tool 10 further satisfies an auxiliary mechanism that assists the operation of the operation member 40, an operation member fixing mechanism that restricts the movement of the operation member 40 relative to the structure 21 until a predetermined condition is satisfied, and a predetermined condition. A safety mechanism is provided that restricts the movement of the cover member 50 relative to the structure 21 and prevents the exposure of the needle tube 61 by the cover member 50 later.

The auxiliary mechanism is configured by a second coil spring 23 that is disposed inside the operation member 40 and generates a force that moves the operation member 40 in the distal direction relative to the structure 21. The second coil spring 23 is a state in which the coil contracts in a natural state where no external force is applied. In a state where the second coil spring 23 is forcibly stretched, the distal end portion is connected to the inner member 70 or the outer member 80 of the structure body 21. The end portion is connected to the pressing base end portion 46 of the pressing portion 41. Therefore, the auxiliary mechanism generates a force for moving the operation member 40 in the distal direction with respect to the structure 21 and functions as an auxiliary when discharging the liquid from the syringe 60 via the needle tube 61. Note that the contraction force of the second coil spring 23 is a magnitude that can prevent liquid from being automatically administered by the contraction force of the second coil spring 23 when the user does not press the operation member 40 in the distal direction. It is preferable. The force acting to move the gasket 62 in the distal direction in the syringe 60 during the administration of the liquid is the contraction force F <b> 1 of the second coil spring 23. In order to counter this, if the force required to discharge the liquid from the space defined by the inner wall surface 65 of the syringe 60 and the gasket 62 through the needle tube 61 is the liquid discharge resistance F0, the following formula ( It is preferable to satisfy 1).
F1 ≦ F0 (1)

  Thereby, when a liquid is administered, the user can be prevented from automatically administering the liquid without pressing the operation member 40 in the distal direction. Therefore, the liquid can be administered as the user intends, for example, the liquid can be administered at the user's pace, and if it is desired to interrupt the liquid administration, the pressing is stopped. Thus, the liquid administration can be interrupted instantly.

  The second coil spring 23 may be a tension coil spring or a compression coil spring.

  The operation member fixing mechanism restricts the movement of the operation member 40 relative to the main body unit 20 until a predetermined condition is satisfied, so that the liquid is not administered even if the user accidentally presses the operation member 40. Mechanism. The operation member fixing mechanism is a longitudinal cross-section in which the cap engaging portion 33 and the base end side engaging portion 43 are provided so as not to interfere with the operation of the cap engaging portion 33 and the base end side engaging portion 43 (A in FIG. 1). It is provided on a longitudinal section (cross section taken along line BB in FIG. 1) rotated by a predetermined angle (60 degrees in this embodiment) with respect to the cross section taken along line -A.

  As shown in FIG. 5, the operating member fixing mechanism includes two fixing engaging portions 72 formed on the inner member 70, two fixing convex portions 47 formed on the operating member 40, and the cover member 50. The two release convex portions 56 are formed.

  The two fixing engaging portions 72 provided on the inner member 70 are opposed to each other at a position different from the position through which the cap engaging portion 33 and the proximal end engaging portion 43 pass with the central axis of the inner member 70 interposed therebetween. These are all located in the proximal direction. At the base end of each fixing engagement portion 72, a fixing claw portion 73 protruding in a direction approaching each other (in the radial direction of the inner member 70) is formed. A third inclined surface 73 </ b> A is formed on the distal end surface of each fixing claw portion 73 so as to be inclined toward the proximal end side inward in the radial direction.

  The two fixing convex portions 47 provided on the operation member 40 are opposed to the positions that are different from the base end side engaging portion 43 and toward the fixing claw portion 73 with the central axis of the operation member 40 interposed therebetween. These are all located in the distal direction. In the initial state (first state) in which the operation member 40 is separated from the structure body 21 in the proximal direction, the distal end surface 73B of the securing claw 73 of the inner member 70 is the distal end surface 47A of each fixing convex portion 47. The movement of the operation member 40 in the distal direction relative to the structure 21 is restricted.

  The two release convex portions 56 provided on the cover member 50 are positioned so as to face each other at positions different from the cap engaging portion 33 and toward the fixing claw portion 73 with the central axis of the cover member 50 interposed therebetween. Both of them extend in the proximal direction. The base end surface 56A of each release convex portion 56 is located away from the fixing claw portion 73 on the distal end side of the fixing claw portion 73 in the first state in which the cover member 50 protrudes from the structure 21 in the distal direction. To do. Then, when the cover member 50 moves in the proximal direction with respect to the structure 21, the proximal end surface 56 </ b> A of the release convex portion 56 is the third slope of the fixing claw portion 73, as shown in FIG. 5B. Abutting on the surface 73A, the claw portions 73 for fixation are moved away from each other (the radially outer side of the inner member 70). As a result, the fixing claw 73 that has been in contact with the front end surface 47A of the fixing convex portion 47 does not come into contact with the front end surface 47A, and the restriction on the movement of the operation member 40 relative to the structure 21 in the front end direction is released. As shown in FIG. 5C, the operation member 40 can move in the distal direction with respect to the structure 21.

  The safety mechanism is a mechanism that prevents the needle tube 61 from being exposed by limiting the movement of the cover member 50 with respect to the main body portion 20 after the administration of the liquid is completed. The safety mechanism includes the cap engagement portion 33 and the proximal end engagement portion so as not to interfere with the operations of the cap engagement portion 33 and the proximal end engagement portion 43 and so as not to interfere with the operation of the operation member fixing mechanism. A vertical cross section (C in FIG. 1) rotated by a predetermined angle (−60 degrees in the present embodiment) different from the operation member fixing mechanism with respect to the vertical cross section (section taken along the line AA in FIG. 1) provided with 43. (Cross section taken along line -C).

  As shown in FIG. 6A, the safety mechanism includes two safety engaging portions 57 formed on the cover member 50, two safety convex portions 48 formed on the operation member 40, and an inner member 70. And a notch portion 74 that provides a space for the safety engagement portion 57 to bend.

  The two safety engaging portions 57 provided on the cover member 50 are at positions different from the positions through which the cap engaging portion 33 and the base end side engaging portion 43 pass and at positions different from the release convex portion 56. The cover members 50 are positioned so as to face each other across the central axis, and both extend in the proximal direction. At the base end of each safety engagement portion 57, a safety claw portion 58 protruding in a direction approaching each other (inward in the radial direction of the cover member 50) is formed. A fourth inclined surface 58A is formed on the proximal end surface of each safety claw portion 58 so as to be inclined toward the distal end side in the radially inner side.

  The two safety convex portions 48 provided on the operation member 40 are located at positions different from the proximal end engaging portion 43 and the fixing convex portion 47 and toward the safety claw portion 58 at the central axis of the operation member 40. Both are located so as to face each other, and both extend toward the distal end. A fifth inclined surface 48A is formed on the distal end surface of each safety convex portion 48 so as to be inclined toward the proximal end as it extends radially outward.

  As shown in FIG. 6B, the two notches 74 formed in the inner member 70 are used for safety of the cover member 50 in a state where the cover member 50 is moved in the proximal direction with respect to the structure 21. It is located on the radially outer side with respect to the engaging portion 57 across the central axis of the inner member 70, and both are formed in a slit shape that is cut away in the distal direction. As shown in FIG. 6A, in the state where the cover member 50 is moved in the distal direction with respect to the structure 21, the notch 74 does not exist on the radially outer side of the safety engagement portion 57. Therefore, the safety engagement portion 57 is restrained from bending outward in the radial direction. From this state, when the cover member 50 is moved in the proximal direction with respect to the structure 21, the notch portion 74 exists on the radially outer side of the safety engagement portion 57. Can be bent outward in the radial direction. When the operation member 40 further moves in the distal direction relative to the structure 21 from this state, the operation member 40 is provided on the fourth inclined surface 58A of the safety claw portion 58 as shown in FIG. 6B. The fifth inclined surface 48 </ b> A of the safety convex portion 48 comes into contact, and the safety engagement portion 57 bends radially outward so as to escape to the notch portion 74. Thereby, the movement of the operation member 40 is not hindered by the safety engagement portion 57, and the liquid can be administered. Then, when the cover member 50 moves in the distal direction with the operation member 40 moved in the distal direction with respect to the structure 21, the bending of the safety engagement portion 57 returns as shown in FIG. The fourth inclined surface 58A of the safety claw portion 58 is in contact with the fifth inclined surface 48A of the safety convex portion 48. At this time, since the notch portion 74 is not provided on the radially outer side of the safety engagement portion 57, the radial engagement of the safety engagement portion 57 is suppressed, and the structure 21 of the cover member 50 is suppressed. Movement in the proximal direction with respect to is suppressed.

  The constituent materials of the cap 30, the housing 36, the operation member 40, the cover member 50, the syringe 60, the inner member 70, and the outer member 80 are not particularly limited. For example, polycarbonate, polyvinyl chloride, polyethylene, polypropylene, cyclic polyolefin, Polyester such as polystyrene, poly- (4-methylpentene-1), polyethylene terephthalate, polyethylene naphthalate, butadiene-styrene copolymer, polyamide (for example, nylon 6, nylon 6,6, nylon 6,10, nylon 12) And various resins.

  The constituent material of the gasket 62 and the elastic body 37 is preferably an elastic material, but is not particularly limited. For example, various rubbers such as natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicone rubber. Examples thereof include materials, various thermoplastic elastomers such as polyurethane, polyester, polyamide, olefin, and styrene, or mixtures thereof.

  The constituent material of the needle tube 61 is not particularly limited, and examples thereof include metal materials such as stainless steel, aluminum or aluminum alloy, titanium or titanium alloy.

  The constituent material of the 1st coil spring 22 and the 2nd coil spring 23 is not specifically limited, For example, metal materials, such as stainless steel and copper, are mentioned.

  Next, a method for using the liquid administration device 10 according to the first embodiment will be described.

  First, as shown in FIG. 2, an unused liquid administration device 10 in an initial state (first state) is prepared. In this initial state, in the liquid administration device 10, the cover member 50 is biased toward the distal end side by the first coil spring 22, the operation member 40 is positioned away from the structure 21 in the proximal direction, and the cap 30 is The cover member 50 is covered. Therefore, the needle tube 61 is surrounded by the cover member 50 and the cap 30, so that erroneous puncture of the needle tube 61 can be reliably prevented, and the sterilized state of the needle tube 61 can be maintained. Moreover, since the cover member 50 is covered with the cap 30, the cover member 50 does not move with respect to the structure 21, and malfunction can be prevented.

  Next, the cap 30 is moved in the distal direction with respect to the main body portion 20, and the cap engaging portion 33 is pulled out from the engaging portion insertion hole 55 of the cover member 50 as shown in FIG. Remove cap 30 from. At this time, the needle tube 61 is pulled out from the needle tip side cap 35, and the tip opening of the needle tube 61 is unsealed.

  Next, the operating member 40 is grasped and the cover tip portion 52 of the cover member 50 is brought into contact with the living body. At this time, as shown in FIG. 5A, the fixing claw 73 of the inner member 70 constituting the operating member fixing mechanism is in contact with the tip surface 47 </ b> A of the fixing convex portion 47, and therefore the operating member 40. The movement in the distal direction with respect to the structure 21 is restricted, so that liquid is not discharged before the needle tube 61 is punctured, and unexpected liquid discharge can be suppressed.

  Next, the operation member 40 is pressed in the distal direction. Thereby, while the position of the operation member 40 with respect to the structure 21 is maintained by the operation member fixing mechanism, the first coil spring 22 contracts as shown in FIG. The operation member 40 moves integrally in the distal direction. As a result, the needle tube 61 projects through the needle passage hole 54 of the cover member 50 in the distal direction, and punctures the living body.

  When the cover member 50 moves in the proximal direction with respect to the structure body 21, the proximal end surface 56 </ b> A of the release convex portion 56 provided on the cover member 50 is formed on the inner member 70 as shown in FIG. The fixing claw 73 abuts against the third inclined surface 73A of the fixing claw 73 provided, and the fixing claw 73 moves radially outward. As a result, the fixing claw 73 that has been in contact with the distal end surface 47A of the fixing convex portion 47 does not come into contact with the fixing convex portion 47, and the operating member fixing mechanism moves the distal end of the operating member 40 with respect to the structure 21. Movement restriction is released.

  Further, when the cover member 50 moves in the proximal direction with respect to the structure 21, the notch 74 is present on the radially outer side of the safety engagement portion 57 constituting the safety mechanism, and the safety engagement is performed. It will be in the state where the part 57 can bend to a radial direction outer side.

  Next, when the operating member 40 is further pressed in the distal direction, the operating member 40 moves in the distal direction with respect to the structure 21 as shown in FIGS. 3 (C) and 5 (C). Thereby, the gasket 62 slides in the syringe 60 in the distal direction, and the liquid in the syringe 60 is administered into the living body via the needle tube 61. At this time, as shown in FIG. 6B, the fifth inclined surface 48A of the safety convex portion 48 provided on the operation member 40 contacts the fourth inclined surface 58A of the safety claw portion 58 constituting the safety mechanism. Since the safety engagement portion 57 bends radially outward so as to escape to the notch 74, the movement of the operation member 40 is not hindered by the safety engagement portion 57, and liquid can be administered. .

  When the operation member 40 moves in the distal direction with respect to the structure 21, a force that moves the operation member 40 in the distal direction acts by the second coil spring 23, which is an auxiliary mechanism. Administration is possible. For this reason, even if it is a case where the elderly person with weak power, a woman, the rheumatic patient with a pain and deformation | transformation of a finger, etc. self-administer, operation is easy. Further, as in the above-described formula (1), the contraction force F1 of the second coil spring 23 prevents the liquid from being automatically administered without the user pressing the operation member 40 in the distal direction. Since the size is set, the liquid can be administered as intended by the user. When the liquid administration is to be interrupted, the liquid administration can be instantaneously interrupted by stopping the pressing.

  When the operation member 40 moves in the distal direction with respect to the structure 21 to complete the administration (second state) and the user loosens the pressing force on the operation member 40, as shown in FIG. Further, due to the expansion force of the first coil spring 22, the structure 21 moves in the proximal direction with respect to the cover member 50, the needle tube 61 is pulled out from the living body, passes through the needle passage hole 54, and enters the inside of the cover member 50. Is housed in. Since the second coil spring 23 is a tension spring that forcibly stretches the contracted state in the natural state, the operation member 40 is applied to the structure 21 as long as no force greater than the contraction force of the second coil spring 23 is applied. On the other hand, it does not move in the proximal direction. When the structure 21 moves in the proximal direction with respect to the cover member 50, as shown in FIG. 6C, the bending of the safety engaging portion 57 constituting the safety mechanism returns, and the safety claw portion 58 It contacts the fifth inclined surface 48A of the safety convex portion 48. At this time, since the notch portion 74 is not provided on the radially outer side of the safety engagement portion 57, the safety engagement portion 57 is prevented from being bent again toward the radially outer side, and the structure 21 is covered. The movement of the member 50 is suppressed. For this reason, it is prevented that the needle tube 61 protrudes from the cover member 50 again, and the safety can be ensured by suppressing erroneous puncture by the needle tube 61.

  Thereafter, the cap 30 removed from the main body 20 before the administration of the liquid is gripped, and the cap engaging portion 33 is inserted into the engaging portion insertion hole 55 of the cover member 50 as shown in FIG. The cap 30 is pushed into the main body 20 in the proximal direction. At this time, unlike the state in which the cap 30 is mounted in the initial state (first state), the operation member 40 is moved in the distal direction with respect to the structure 21 (second state). The engaging portion 33 comes into contact with the proximal end side engaging portion 43. As a result, the first inclined surface 34A of the cap claw portion 34 is deformed while sliding on and in contact with the second inclined surface 44A of the base end side claw portion 44, and the cap claw portion 34 gets over the base end side claw portion 44. It moves to the base end side from the base end side claw portion 44. At this time, since the angle β of the cap claw tip end face 34B is approximately 90 degrees and the angle α of the base claw base end face 44B is approximately 90 degrees, the cap claw tip end face 34B and the base end claw Almost no force acts in the direction of sliding between the base end surfaces 44B (the direction orthogonal to the axial direction), and the cap claw portion 34 and the base end side claw portion 44 engage with each other so as not to be detached. Thereby, the cap 30 can be firmly attached to the main body portion 20 so as not to be removable. Further, although not particularly limited, the cap claw distal end surface 34B and the proximal end claw proximal end surface 44B are difficult to slip, and the surface of the cap claw distal end surface 34B and the proximal end claw proximal end surface 44B in order to increase the engagement force. There may be small irregularities. Alternatively, there may be a protrusion having a shape that meshes with the cap claw portion distal end surface 34B and the proximal end claw portion proximal end surface 44B.

  As described above, in the liquid administration device 10 according to the first embodiment, the main body 20 has the syringe 60 (container) that can contain the liquid therein, and the needle tip at the distal end and the proximal end of the syringe 60. A structure 21 having a needle tube 61 that can communicate with the inside, and a structure 21 that is movable in the distal direction relative to the structure 21 and that has moved in the distal direction from the first state before moving in the distal direction. The operation member 40 that reduces the internal volume of the syringe 60 to discharge the liquid from the needle tube 61 by performing the operation so as to be in two states, and the outer periphery of the needle tube 61 that is biased toward the distal end with respect to the structure 21 A cover member 50 that has a needle passage hole 54 (opening) formed on the distal end side and projects the needle tube 61 from the needle passage hole 54 in the distal direction by moving in a proximal direction relative to the structure 21; Have. Then, the cap 30 (protective member) does not engage with the base end side engaging portion 43 (first engaging portion) provided in the main body portion 20 in the first state, and is based on the main body portion 20 in the second state. A cap engaging portion 33 (second engaging portion) that can be engaged with the proximal end side engaging portion 43 by moving linearly in the end direction is provided. For this reason, in the first state before administration of the liquid, the cap 30 can be easily removed without engaging the cap engagement portion 33 with the proximal end side engagement portion 43, and in the second state after administration of the liquid, The cap engaging portion 33 is engaged with the base end side engaging portion 43 so that the cap 30 can be firmly attached to the main body portion 20 so that it cannot be removed. Therefore, the cap 30 that is removed before use can be effectively used to prevent erroneous puncture of the used needle tube 61, thereby improving safety. For this reason, it is not necessary to store and transport the used liquid administration device 10 in a dedicated disposal box, and it is not necessary to obtain a new disposal box, so that it is easy to ensure safety after use.

  In addition, since the proximal end side engaging portion 43 is formed on the operation member 40, the operation side of the operation member 40 that moves in the distal direction with respect to the structure 21 is used, and the proximal end side in the first state before the operation. A structure in which the engaging portion 43 is engaged with the cap engaging portion 33 in the second state without being engaged with the cap engaging portion 33 can be easily realized. In addition, since the cap engagement portion 33 is engaged with the base end side engagement portion 43, the cap 30 and the operation member 40 are connected to each other. It is also possible to suppress movement in the proximal direction.

  Further, the cover member 50 has the cap engaging portion 33 inserted in advance in the first state, and the cap engaging portion 33 is inserted in the second state so that the cap engaging portion 33 is connected to the proximal end side engaging portion. Since the engaging portion insertion hole 55 to be engaged with 43 is formed, the hole into which the cap engaging portion 33 is inserted in advance before use is the same as the hole into which the cap engaging portion 33 is inserted after use. When the cap 30 is attached after the administration of the liquid, the hole for inserting the cap engaging portion 33 is not mistaken, and the operation becomes easy. In addition, since the engaging portion insertion hole 55 is partially formed in the cover member 50 around the needle tube 61 instead of the entire circumference, the cap engaging portion 33 is provided with another mechanism (for example, an operation member fixing mechanism, Therefore, the multifunctional liquid administration device 10 can be easily configured.

  In addition, since the main body portion 20 has a safety mechanism that comes into contact with the cover member 50 by changing from the first state to the second state and restricts the movement of the cover member 50 relative to the main body portion 20 in the proximal direction, The needle tube 61 is prevented from projecting again from the cover member 50, and erroneous puncture by the needle tube 61 can be suppressed to ensure safety. Further, when the cap 30 is mounted after the liquid is administered, the cover member 50 does not move in the proximal direction, the cap 30 can be easily mounted, and the needle tube 61 can be prevented from protruding during the mounting. Safety can be ensured by preventing false punctures.

In addition, since the main body 20 has an auxiliary mechanism that assists the movement of the operation member 40 by applying a force to move the operation member 40 in the distal direction with respect to the structure 21, liquid can be administered with a small pressing force. Therefore, the operation is easy. Further, by providing the auxiliary mechanism, the operation member 40 is reliably moved in the distal direction with respect to the structure 21, and the cap engaging portion 33 is moved to the proximal end engaging portion 43 when the cap 30 is attached. Engage reliably.
Second Embodiment

  As shown in FIG. 7, the liquid administration device 100 according to the second embodiment includes a second insertion hole 156 of a cover member 150 into which a cap engagement portion 133 (second engagement portion) is inserted after liquid administration. The difference between the engaging portion 133 and the first insertion hole 155 in which the engaging portion 133 is inserted in advance is that the cap engaging portion 133 is formed on the outer member 180 instead of the operating member 140 (first engagement portion 181). This is different from the first embodiment in that it is engaged with the joint portion. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIGS. 7 and 9A, the liquid administration device 100 includes a main body 120 used for liquid administration, and a cap 130 (protective member) that is removed from the main body 120 at the time of liquid administration. I have. The main body 120 is movable with respect to the structure 121 (lower housing) that stores liquid therein, an operation member 140 (upper housing) for performing an operation of discharging liquid from the structure 121, and the structure 121. Cover member 150, first coil spring 22 that urges cover member 150 in the distal direction, and second coil spring 23 that applies a force to move operation member 140 relative to structure 121. .

  The structure 121 includes a cylindrical syringe 60 (container) that can accommodate a liquid therein, a needle tube 61 that is attached to the tip of the syringe 60, and a gasket 62 that is slidably disposed with respect to the inside of the syringe 60. And an inner member 170 that is disposed on the outer periphery of the syringe 60 and supports the syringe 60, and an outer member 180 that is disposed outside the inner member 170.

  The operation member 140 is the same as the operation member 40 in the first embodiment except that the first engagement portion (the base end side engagement portion 43 of the first embodiment) is not formed.

  The cap 130 includes two cap engaging portions 133 (second engaging portions) extending from the inner surface of the cap distal end portion 32 in the proximal direction. The two cap engaging portions 133 are positioned so as to face each other with the central axis of the cap 130 therebetween, and both extend in the proximal direction. A cap claw portion 134 is formed at the tip of each cap engaging portion 133 so as to protrude in a direction away from each other (the radially outer side of the cap 130). A first inclined surface 134A is formed on the base end surface of each cap claw portion 134 such that the first inclined surface 134A is inclined toward the distal end side in the radially outer side. And cap claw part front end surface 134B which is a front end surface of each cap claw part 134 is formed with an angle β of about 90 degrees with respect to a portion extending from cap front end part 32.

  A flat cover distal end 152 formed at the base end of the cover cylinder portion 51 of the cover member 150 is formed with a needle passage hole 154 (opening) through which the needle tube 61 can project on the central axis of the cover member 150. Two first insertion holes 155 and two second insertion holes 156 are formed at positions facing each other across the needle passage hole 154. A longitudinal section where the safety mechanism is provided (a section along the line DD in FIG. 7), a longitudinal section where the first insertion hole 155 is formed (a section along the line EE in FIG. 7), and a second insertion hole 156. The longitudinal section formed (section taken along line FF in FIG. 7) and the longitudinal section provided with the operation member fixing mechanism (section taken along line GG in FIG. 7) are centered on the central axis of the liquid administration device 100. And are shifted by 40 degrees in the rotation direction. The first insertion hole 155 is an insertion hole into which the cap engagement part 133 is inserted in advance, and the second insertion hole 156 is an insertion hole into which the cap engagement part 133 is inserted after liquid administration.

  As shown in FIG. 8, the first insertion hole 155 is formed with an insertion restricting portion 153 that is elastically deformable and is inclined so as to protrude toward the distal end side. The insertion restricting portion 153 allows the cap engaging portion 133 previously inserted into the first insertion hole 155 to be pulled out, but the opening area of the first insertion hole 155 is reduced by pulling out the cap engaging portion 133. And inclined so as to protrude toward the tip. Thereby, the insertion restriction part 153 suppresses the cap engagement part 133 from being inserted into the first insertion hole 155 again. Note that the shape and the configuration of the insertion restricting portion 153 are not particularly limited as long as the reinsertion of the cap engaging portion 133 can be suppressed.

  As shown in FIG. 9A, the inner member 170 has a support hole 71 surrounding the outer periphery of the syringe 60, and the syringe 60 is fitted into the support hole 71 so that the syringe 60 is supported. .

  As shown in FIG. 9B, the outer member 180 includes two base end side engaging portions 181 (first engaging portions) on the extension lines of the two second insertion holes 156. The two base end side engaging portions 181 are formed with base end side claw portions 182 that extend inward in the radial direction from the outer member 180 and project in a direction approaching each other (inward in the radial direction of the outer member 180). Yes. The base end side claw base end surface 182A that is the base end face of each base end side claw portion 182 is formed with an angle α with respect to the central axis of the outer member 180 being approximately 90 degrees.

  Then, when the cap 130 is attached to the cover member 150 in a state where the operation member 140 has moved in the distal direction with respect to the structure 121 to a position covering the outer peripheral surface of the outer member 180 (see FIG. 10C). The cap engaging portion 133 passes through the second insertion hole 156, and the first inclined surface 134A of the cap claw portion 134 is deformed while sliding in contact with the proximal end side claw portion 182 so that the cap claw portion 134 is proximal. The cap claw part 134 and the proximal claw part 182 are engaged with each other by moving over the claw part 182 and moving to the proximal side from the proximal claw part 182. At this time, since the angle β of the cap claw tip end surface 134B is approximately 90 degrees and the angle α of the base claw base end surface 182A is approximately 90 degrees, the cap claw tip end surface 134B and the base end claw Almost no force acts in the direction of sliding between the base end surfaces 182A (the direction orthogonal to the axial direction), and the cap claw portion 134 and the base end side claw portion 182 engage with each other in a non-detachable manner. Note that the values of the angle α and the angle β are not limited as long as they can generate a force that prevents disengagement by engaging with each other, and may be less than 90 degrees or more than 90 degrees. In the initial state where the cap engaging portion 133 is inserted into the first insertion hole 155 (see FIG. 9A), the proximal end side engaging portion 181 exists on the extension line of the first insertion hole 155. Therefore, the cap engaging part 133 that has passed through the first insertion hole 155 does not come into contact with the base end side engaging part 181, and the cap claw part 134 and the base end side claw part 182 are not engaged.

  The liquid administration device 100 according to the second embodiment includes the same operation member fixing mechanism, auxiliary mechanism, and safety mechanism as those of the first embodiment.

  Next, a method for using the liquid administration device 100 according to the second embodiment will be described.

  First, as shown in FIG. 9A, an unused liquid administration device 100 in an initial state (first state) is prepared. In this initial state, in the liquid administration device 100, the cover member 150 is urged toward the distal end side by the first coil spring 22, the operation member 140 is positioned away from the structure 121 in the proximal direction, and the cap 130 is The cover member 150 is covered. Since the cap engaging portion 133 of the cap 130 is inserted into the first insertion hole 155 of the cover member 150 and does not contact the proximal end side engaging portion 181, the cap 130 is connected to the main body portion 120 in a removable state. Has been.

  Next, the cap 130 is moved in the distal direction with respect to the main body 120, the cap engaging portion 133 is pulled out from the first insertion hole 155 of the cover member 150, and the cap 130 is removed from the main body 120.

  Next, the operation member 140 is grasped, and the cover tip 152 of the cover member 150 is brought into contact with the living body as shown in FIG. 9B. At this time, similarly to the first embodiment, the operation member fixing mechanism (see FIG. 5) restricts the movement of the operation member 140 in the distal direction with respect to the structure 121, and the liquid flows before puncturing the needle tube 61. Unexpected liquid discharge can be suppressed without being discharged.

  Next, the operation member 140 is pressed in the distal direction. As a result, as shown in FIG. 9C, the position of the operation member 140 with respect to the structure 121 is maintained by the operation member fixing mechanism, and the first coil spring 22 contracts, so that the structure 121 and the cover member 150 The operation member 140 moves integrally in the distal direction. As a result, the needle tube 61 projects through the needle passage hole 154 of the cover member 150 in the distal direction, and punctures the living body.

  Then, when the cover member 150 moves in the proximal direction with respect to the structure 121, the movement restriction in the distal direction of the operation member 140 with respect to the structure 121 by the operation member fixing mechanism is released as in the first embodiment. (See FIG. 5B).

  Next, when the operation member 140 is further pressed in the distal direction, the operation member 140 moves in the distal direction with respect to the structure 121 as shown in FIG. Thereby, the gasket 62 slides in the syringe 60 in the distal direction, and the liquid in the syringe 60 is administered into the living body via the needle tube 61.

  When the operation member 140 moves in the distal direction relative to the structure body 121, a force that moves the operation member 140 in the distal direction acts by the second coil spring 23 that is an auxiliary mechanism, and administration is possible with a small pressing force. It is.

  After the operation member 140 moves in the distal direction and administration is completed, when the user loosens the pressing force on the operation member 140, the structure is caused by the expansion force of the first coil spring 22 as shown in FIG. The body 121 moves in the proximal direction with respect to the cover member 150, and the needle tube 61 is pulled out from the living body and accommodated inside the cover member 150. When the structure 121 moves in the proximal direction with respect to the cover member 150, the same safety mechanism (see FIG. 6C) as in the first embodiment is activated, and the movement of the cover member 150 with respect to the structure 121 is performed. It is suppressed. For this reason, it is prevented that the needle tube 61 protrudes from the cover member 150 again, and the erroneous puncture by the needle tube 61 can be suppressed to ensure safety.

  Thereafter, the cap 130 removed from the main body 120 before the liquid administration is gripped, and the cap engaging portion 133 is inserted into the second insertion hole 156 of the cover member 150 as shown in FIG. 130 is pushed into the main body 120 in the proximal direction. At this time, since the insertion of the cap engagement portion 133 is restricted by the insertion restriction portion 153 in the first insertion hole 155, erroneous insertion of the cap engagement portion 133 into the first insertion hole 155 is prevented, and the second The insertion operation into the insertion hole 156 becomes easy.

  When the cap engaging portion 133 is inserted into the second insertion hole 156, the cap engaging portion 133 comes into contact with the proximal end side engaging portion 181 formed on the outer member 180. Accordingly, the first inclined surface 134A of the cap claw part 134 is deformed while sliding in contact with the base end side claw part 182 and the cap claw part 134 gets over the base end side claw part 182 and is more than the base end side claw part 182. Also moves to the proximal side. At this time, since the angle β of the cap claw tip end surface 134B is approximately 90 degrees and the angle α of the base claw base end surface is approximately 90 degrees, the cap claw tip end surface 134B and the base end claw portion Almost no force acts in the direction of sliding between the base end surfaces 182A (the direction orthogonal to the axial direction), and the cap claw part 134 and the base end side claw part 182 are engaged with each other so as not to be detached. Thereby, the cap 130 can be firmly attached to the main body 120 so that it cannot be removed.

  As described above, according to the liquid administration device 100 according to the second embodiment, in the first state before liquid administration, the cap 130 is easily engaged without the cap engagement portion 133 engaging the proximal end engagement portion 181. In the second state after administration of the liquid, the cap engagement portion 133 is engaged with the proximal end side engagement portion 181 so that the cap 130 cannot be removed from the main body portion 120. Can be attached firmly.

  Further, since the base end side engaging portion 181 (first engaging portion) is formed on the outer member 180 constituting the structure body 121, the cap 130 is directly attached to the structure body 121 on which the needle tube 61 is provided. It can be firmly fixed, improving safety.

  Further, the cover member 150 has a first insertion hole 133 into which a cap engaging portion 133 (second engaging portion) is inserted in advance in the first state before liquid administration, and a cap engagement in the second state after liquid administration. Since the coupling portion 133 is inserted and a second insertion hole 156 for engaging the cap engagement portion 133 with the proximal end side engagement portion 181 (first engagement portion) is formed, the cap engagement portion 133 is previously formed. By inserting the cap engaging portion 133 into the second insertion hole 156 different from the first insertion hole 155 into which the cap is inserted, the cap engaging portion 133 is engaged with the proximal end side engaging portion 181 and the cap 130 is inserted. Can be firmly attached to the main body 120 so that it cannot be removed.

Further, since the cap insertion portion 133 (second engagement portion) is pulled out of the first insertion hole 155, an insertion limiting portion 153 that limits reinsertion of the cap engagement portion 133 is provided. Incorrect insertion of the cap engaging portion 133 into the first insertion hole 155 is prevented, and insertion into the second insertion hole 156 is facilitated.
<Third Embodiment>

  In the liquid administration device 200 according to the third embodiment, as shown in FIG. 11, the cap engaging portion 233 provided in the cap 230 is not the outer member 280 constituting the structure 221 (lower housing) but the inner member 270. It differs from 2nd Embodiment by the point which engages with the base end side engaging part 271 (1st engaging part) provided in this. In addition, since the other structure is the same as that of 2nd Embodiment, it attaches | subjects the same code | symbol and abbreviate | omits description.

  As shown in FIGS. 11 and 12A, the cap 230 (protective member) includes two cap engaging portions 233 (second engaging portions) extending from the inner surface of the cap distal end portion 32 in the proximal direction. I have. The two cap engaging portions 233 are positioned so as to face each other with the central axis of the cap 230 interposed therebetween, and both extend in the proximal direction. At the base end of each cap engaging portion 233, a cap claw portion 234 is formed that protrudes in a direction away from each other (the radially outer side of the cap 230). A first inclined surface 234 </ b> A is formed on the base end surface of each cap claw portion 234 so as to be inclined toward the distal end side in the radially outer side. And cap claw part front end surface 234B which is a front end face of each cap claw part 234 is formed at an angle β of about 90 degrees with respect to a portion extending from cap front end part 32.

  As shown in FIG. 12B, the inner member 270 includes two proximal-side engagement portions 271 (first engagement portions) on the extension lines of the two second insertion holes 156. The two base end side engaging portions 271 are formed with base end side claw portions 272 protruding in a direction approaching each other (inward in the radial direction of the inner member 270). The base end side claw base end surface 272A formed at the base end of each base end side claw 272 is formed with an angle α with respect to the central axis of the inner member 270 of approximately 90 degrees.

  In the initial state (first state) of the liquid administration device, as shown in FIG. 12A, the cover member 150 is urged toward the distal end side by the first coil spring 22, and the operation member 140 is a structural body. The cap 230 covers the cover member 150 and is located away from 121 in the proximal direction. Since the cap engaging portion 233 of the cap 230 is inserted into the first insertion hole 155 of the cover member 150 and does not come into contact with the base end side engaging portion 271, the cap 230 can be easily detached from the main body portion 220. .

  When the cap 230 is attached to the cover member 150 in the second state in which the operation member 140 moves in the distal direction with respect to the structure 221 to a position covering the outer peripheral surface of the outer member 280, the cap member 230 is attached to the cover member 150 as shown in FIG. As shown, the cap engaging portion 233 passes through the second insertion hole 156, the first inclined surface 234A of the cap claw portion 234 is deformed while sliding in contact with the proximal end claw portion 272, and the cap claw portion 234 is The cap claw portion 234 and the base end side claw portion 272 are engaged with each other by moving over the base end side claw portion 272 and moving to the base end side from the base end side claw portion 272. At this time, since the angle β of the cap claw tip end surface 234B is approximately 90 degrees and the angle α of the base claw base end surface 272A is approximately 90 degrees, the cap claw tip end surface 234B and the base end claw Almost no force acts in the direction of sliding between the base end surfaces 272A (the direction orthogonal to the axial direction), and the cap claw portion 234 and the base end side claw portion 272 engage with each other in a non-detachable manner. Thereby, the cap 230 can be firmly attached to the main body 220 so as not to be removable.

  As described above, also with the liquid administration device according to the third embodiment, in the first state before administration, the cap 230 can be easily removed without engaging the cap engagement portion 233 with the proximal end engagement portion 271. In the second state after liquid administration, the cap 230 can be firmly attached to the main body 220 by engaging the cap engaging portion 233 with the proximal end engaging portion 271.

  Further, since the proximal end side engaging portion 271 (first engaging portion) is formed on the inner member 270 constituting the structure body 221, the cap 230 is directly and against the structure body 221 provided with the needle tube 61. It can be firmly fixed, improving safety.

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art within the technical idea of the present invention. For example, in each of the above-described embodiments, two first engaging portions and two second engaging portions are provided, but the number is not limited, and even if there is one, there are three or more. Also good.

  Further, as in the modified example of the first embodiment shown in FIG. 13, the engagement portion insertion hole 355 into which the cap engagement portion 33 (second engagement portion) is inserted has a needle tube protruding from the cover member 350. It may be formed all around so as to surround the position. In this case, the cap engagement portion 33 (second engagement portion) is engaged with the proximal end engagement portion 341 (first engagement portion) of the operation member 340 (upper housing) regardless of the rotation direction position. The base end side engaging portion 341 is formed in an annular shape on the entire circumference so that they can be combined. Thereby, it becomes possible to engage the cap engaging part 33 and the base end side engaging part 341 no matter where the cap engaging part 33 is inserted in the circumferential direction of the engaging part insertion hole 355. The operation of mounting 30 becomes easy. Instead of forming the base end side engaging portion (first engaging portion) in an annular shape, the cap engaging portion (second engaging portion) may be formed in an annular shape.

  The liquid administration device may not include at least one of an auxiliary mechanism, an operation member fixing mechanism, and a safety mechanism.

  Further, the liquid administration device may be an autoinjector that automatically administers liquid.

10, 100, 200 liquid administration device,
20, 120, 220 main body,
21, 121, 221 structure,
30, 130, 230 cap,
33, 133, 233 cap engaging portion (second engaging portion),
40, 140, 340 operation members,
43, 181, 271, 341 Base end side engaging portion (first engaging portion),
50, 150, 350 cover member,
54,154 Needle passage hole (opening),
55, 355 engaging portion insertion hole (insertion hole),
60 syringe (container),
61 needle tube,
70, 170, 270 inner member,
80, 180, 280 outer member,
155 first insertion hole,
156 second insertion hole,
153 Insertion restriction part.

Claims (9)

A liquid administration device having a main body part in which a needle tube for dispensing a liquid is projectably provided, and a protective member that is removably attached to the main body part so as to cover a part from which the needle tube projects. And
The main body is
A container that can contain a liquid therein, and a structure that includes a needle tube that has a needle tip at a distal end and a proximal end that can communicate with the inside of the container;
The housing is movable in a distal direction relative to the structure, and is pressed to change from a first state before moving in the distal direction to a second state after moving in the distal direction. An operation member for reducing the internal volume of the body and discharging liquid from the needle tube;
The structure is biased in the distal direction to surround the outer periphery of the needle tube, an opening is formed on the distal end side, and the needle tube is moved from the opening by moving in the proximal direction with respect to the structure. A cover member that protrudes in the distal direction,
The protective member does not engage with a first engaging portion provided in the main body portion in the first state, and moves linearly in the proximal direction with respect to the main body portion in the second state. A liquid administration device comprising a second engagement portion engageable with one engagement portion.   The liquid administration device according to claim 1, wherein the first engagement portion is formed on the operation member.   The liquid administration device according to claim 1, wherein the first engagement portion is formed in the structure.   The cover member has the second engagement portion inserted in advance in the first state, and the second engagement portion is inserted in the second state to connect the second engagement portion to the first engagement. The liquid administration device according to any one of claims 1 to 3, wherein an insertion hole to be engaged with the joint is formed.   5. The liquid administration device according to claim 4, wherein the insertion hole is formed on the entire circumference of the cover member so as to surround a position where the needle tube protrudes.   The cover member includes a first insertion hole into which the second engagement portion is inserted in advance in the first state, and the second engagement portion in which the second engagement portion is inserted in the second state. The liquid administration device according to any one of claims 1 to 3, wherein a second insertion hole to be engaged with the first engagement portion is formed.   The liquid administration device according to claim 6, wherein an insertion restricting portion that restricts reinsertion of the second engaging portion after the second engaging portion is pulled out is provided in the first insertion hole.   The said main-body part has a safety mechanism which contacts the said cover member and controls the movement to the base end direction with respect to the said main-body part by changing from the said 1st state to a 2nd state. The liquid administration device according to any one of the above.   The said main-body part has an auxiliary mechanism which provides the force which moves the said operation member to a front-end | tip direction with respect to the said structure, and assists the movement of the said operation member. Liquid dosing device.

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