WO2017170502A1

WO2017170502A1 - Syringe

Info

Publication number: WO2017170502A1
Application number: PCT/JP2017/012563
Authority: WO
Inventors: 竹本昌史
Original assignee: テルモ株式会社
Priority date: 2016-03-30
Filing date: 2017-03-28
Publication date: 2017-10-05
Also published as: JPWO2017170502A1

Abstract

A syringe (10A) is provided with a barrel (12), a needle (14) protruding from the barrel (12), and a protective device (20) comprising a cover member (28) that is capable of relative axial displacement with respect to the barrel (12) and covers the needle tip (15) after the needle (14) has been inserted into a subject. An anti-slip member (30) that extends in the circumferential direction is provided at the distal end of the cover member (28) to prevent slippage once the cover member (28) has obliquely contacted the subject. The anti-slip part (30) comprises, for example, a projecting structure (32).

Description

Syringe

The present invention relates to a syringe provided with a protection device.

2. Description of the Related Art A syringe used for administration of a medical solution or the like to a patient is known which includes a protective device for preventing inadvertent puncture due to exposure of a puncture needle before and after puncture (for example, a special table) (See 2011-513035). Such a protective device has a cover member that is axially displaceable relative to the barrel of the syringe. Before the puncture, the cover member covers the needle tip of the puncture needle. The cover member is displaced in the proximal direction with respect to the barrel by being pushed by the skin as the puncture needle punctures the skin.

When a medical solution or the like is administered to a patient using a syringe equipped with a protective device, a user such as a doctor may puncture the puncture needle obliquely with respect to the skin depending on the user's preference or the like. In such a case, the front end portion of the cover member comes into contact with the skin obliquely before the puncture needle is punctured into the skin, so that the cover member is easy to slide against the skin. Therefore, it may be difficult to puncture the target site with the puncture needle.

The present invention has been made in consideration of such problems, and provides a syringe capable of suppressing the sliding of the cover member with respect to the skin when the puncture needle is punctured obliquely with respect to the skin. For the purpose.

In order to achieve the above object, the syringe of the present invention is a barrel, a puncture needle that protrudes from the distal end portion of the barrel in the distal direction and has a needle tip at the distal end, and is axially displaceable with respect to the barrel. The cover member has a hollow cylindrical cover member, and the cover member covers at least a part of the puncture needle in an initial state, and is pressed against the puncture target when the puncture needle is punctured to the puncture target. And a protection device configured to cover the needle tip with the cover member after the puncture needle is punctured into the puncture target. The distal end portion is provided with a slip suppressing portion that extends in a circumferential direction and suppresses slipping on the puncture target when the cover member is in contact with the puncture target at an angle. .

According to the syringe of the present invention that employs the above configuration, since the slip suppression portion is provided at the distal end portion of the cover member, even when the cover member is contacted obliquely with respect to the puncture target, the cover member is It is possible to effectively suppress sliding with respect to the puncture target.

In the above syringe, the slip prevention part may be formed in an annular shape.

With this configuration, a slip suppression effect can be exhibited regardless of the circumferential position of the cover member with respect to the puncture target.

In the above syringe, the slip suppression portion may have a protruding structure that protrudes radially outward from the cover member.

With this configuration, the protrusion structure bites into the puncture target at the time of contact with the puncture target, thereby providing a slip suppression function with a simple configuration.

In the above syringe, the protruding structure may protrude from the outer peripheral surface of the cover member.

This configuration can more effectively exhibit the slip suppression function.

In the above syringe, the protrusion structure may have a plurality of protrusions arranged in the axial direction.

This configuration provides a better slip suppression function.

In the above-described syringe, the protrusions adjacent to each other in the plurality of protrusions may protrude outward in the radial direction from the protrusion on the proximal end side than the protrusion on the distal end side.

With this configuration, it is possible to cause the protrusion on the proximal end side of adjacent protrusions to bite into the puncture target and to reliably exhibit the slip suppression function.

In the above syringe, the protruding structure may have a tip surface perpendicular to the axial direction.

This configuration provides a good slip suppression function.

In the above-described syringe, the cover member may have a curved surface on the distal end side with respect to the protruding structure, the outer diameter of which decreases in the distal direction.

With this configuration, it is possible to suppress slipping while suppressing irritation upon contact with the puncture target.

In the above syringe, the cover member includes a cover member main body and the slip suppression portion fixed to a distal end portion of the cover member main body, and the slip suppression portion is an elastic member made of an elastic material. There may be.

This makes it possible to obtain a good slip suppression function while suppressing irritation upon contact with the puncture target.

In the above syringe, the elastic member may be fixed to a distal end surface of the cover member main body.

This makes it possible to easily provide an elastic member at the tip of the cover member body.

In the above syringe, the elastic member may cover the distal end portion of the cover member main body from the outer peripheral surface to the distal end surface.

With this configuration, slippage can be effectively suppressed regardless of the puncture angle of the puncture needle with respect to the puncture target.

In the above syringe, the elastic member may have a concave portion that engages with a convex portion provided on the inner peripheral portion of the tip of the cover member body, and may be fitted inside the tip portion of the cover member body. .

With this configuration, the elastic member can be easily assembled to the cover member main body in the assembly process.

In the above-described syringe, the elastic member may be fitted into a groove provided at a distal end portion of the cover member main body and protrude from an outer peripheral surface of the distal end portion.

With this configuration, the amount of material used for the elastic member can be suppressed, and the elastic member can be easily assembled to the cover member main body in the assembly process.

In the above syringe, a liquid chamber formed by the gasket and the gasket that is slidably inserted into the barrel, a pusher that is connected to or connectable to the gasket, and the barrel and the gasket is filled. And a chemical solution.

According to the syringe of the present invention, when the puncture needle is punctured obliquely with respect to the skin, the cover member can be prevented from sliding with respect to the skin.

It is the whole syringe perspective view concerning a 1st embodiment. It is sectional drawing of the front-end | tip part of the syringe which concerns on 1st Embodiment. It is the 1st figure explaining an operation of the syringe concerning a 1st embodiment. It is a 2nd figure explaining the effect | action of the syringe which concerns on 1st Embodiment. It is sectional drawing of the front-end | tip part of the syringe which concerns on 2nd Embodiment. It is sectional drawing of the front-end | tip part of the syringe which concerns on 3rd Embodiment. It is sectional drawing of the front-end | tip part of the syringe which concerns on 4th Embodiment. It is sectional drawing of the front-end | tip part of the syringe which concerns on 5th Embodiment. It is sectional drawing of the front-end | tip part of the syringe which concerns on 6th Embodiment.

Hereinafter, preferred embodiments of the syringe according to the present invention will be described with reference to the accompanying drawings. Note that “user” in the following description refers to a person who administers a medical solution (injection solution) to a patient, but the user is not limited to a doctor, a nurse, or the like, and includes the patient itself. In the following description, “proximal end” refers to an end portion on the side close to the user who operates the syringe, and “tip” refers to an end portion on the side away from the user. In the second to sixth embodiments, the same or similar elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[First Embodiment]
In FIG. 1, the syringe 10A according to the present embodiment is configured as a prefilled syringe that is pre-filled with a chemical M in a product provision state. The syringe 10A includes a hollow barrel 12, a drug solution M filled in the barrel 12, a puncture needle 14 protruding from the distal end portion of the barrel 12 in the distal direction, a gasket 16 inserted into the barrel 12, and a gasket. 16 includes a pusher 18 connected to 16 and a protection device 20 attached to the barrel 12.

The barrel 12 is a hollow body having a substantially cylindrical barrel body 22 and a proximal end opening at the proximal end. A flange 24 is formed on the outer peripheral portion of the base end of the barrel body 22 so as to protrude outward in the radial direction. A needle holder 26 is provided at the tip of the barrel body 22. The needle holding part 26 is reduced in diameter with respect to the barrel body part 22 and extends in the distal direction, and holds the proximal end part of the puncture needle 14. The flange 24 and the needle holding part 26 are formed integrally with the barrel body part 22.

In the barrel 12, a gasket 16 is inserted through a base end opening. The proximal end side of the barrel 12 is liquid-tightly sealed by the gasket 16, and the chemical solution M is sealed in the barrel 12. The gasket 16 is arranged so that its outer peripheral portion is in liquid-tight contact with the inner peripheral surface of the barrel 12 and is slidable in the barrel 12.

The tip of a pusher 18 is connected to the gasket 16. When the user presses the pusher 18, the gasket 16 slides in the barrel 12 in the distal direction. The pusher 18 may be connected to the gasket 16 when the patient is punctured with the puncture needle 14 and the medicinal solution M is administered to the patient.

The puncture needle 14 is a hollow body in which a lumen as a fluid passage is formed, and a sharp needle tip 15 is formed at the tip thereof. The puncture needle 14 protrudes from the needle holding portion 26 in the distal direction. The lumen of the puncture needle 14 communicates with the hollow portion (liquid chamber) of the barrel 12 through the proximal end opening of the puncture needle 14.

The puncture needle 14 is fixed and held at the center of the needle holding part 26. The drug solution M accommodated in the hollow interior of the barrel 12 is discharged from the distal end of the lumen of the puncture needle 14 and administered to the patient.

The protection device 20 covers the puncture needle 14 before and after the puncture of the puncture needle 14 to the patient, thereby preventing inadvertent punctures other than when the drug solution M is administered to the patient. is there. The protection device 20 includes at least a hollow cylindrical cover member 28 that can be displaced relative to the barrel 12 in the axial direction.

In the initial state before use shown in FIG. 1, the cover member 28 has a distal end located closer to the distal end than the needle tip 15 of the puncture needle 14 and covers the needle tip 15. The cover member 28 is relatively displaced in the proximal direction with respect to the barrel 12 when the puncture needle 14 is punctured to the patient to be punctured, and the puncture needle 14 protrudes in the distal direction from the distal opening 29 of the cover member 28 (FIG. 4). The cover member 28 is displaced relative to the barrel 12 in the distal direction after puncturing, and covers the needle tip 15 of the puncture needle 14 again. In the initial state, the needle tip 15 of the puncture needle 14 may protrude from the distal end opening 29 of the cover member 28 in the distal direction.

The constituent material of the cover member 28 is not particularly limited, and examples thereof include resin materials such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, ABS, and high-density polyethylene.

The configuration of the protection device 20 provided with the cover member 28 acting in this way is not limited to a specific configuration, and can take various forms. Therefore, the protection device 20 may be configured as described below, for example, or may be configured in another form.

The protection device 20 includes an inner member rotatably attached to the outer periphery of the needle holding portion 26, a cover member 28 that is movable in the axial direction relative to the inner member, and biases the cover member 28 in the distal direction. A spring member (biasing member). In this case, a cam protrusion protruding radially outward is formed on the outer peripheral portion of the inner member. The cover member 28 is formed of a hollow body having a side wall that forms a through hole extending from the front end to the base end, and the inner member is accommodated in the through hole. A guide path is formed on the side wall of the cover member 28, and the cam projection of the inner member is movably disposed in the guide path. The spring member is accommodated in the through hole of the cover member 28, and biases the cover member 28 in the distal direction with respect to the inner member.

In this case, in the guide path, the cover member 28 is relatively displaced in the proximal direction with respect to the barrel 12 from the initial position with the puncture operation of the puncture needle 14 to the patient, and is guided to the retracted position. 14 may be configured to be relatively displaced in the distal direction with respect to the barrel 12 from the retracted position in accordance with the extraction operation 14 and guided to the lock position. In this case, the cover member 28 covers the needle tip 15 of the puncture needle 14 at the initial position. The puncture needle 14 is protruded from the distal end opening 29 at the retracted position, and the needle tip 15 of the puncture needle 14 is covered at the locked position. When the cover member 28 moves from the initial position to the retracted position, the spring member is compressed in the axial direction. The cover member 28 is moved from the retracted position to the locked position by the elastic biasing force of the spring member when the puncture needle 14 is removed. When the cover member 28 is located at the initial position, the needle tip 15 may be exposed (protruded) from the tip opening 29 of the cover member 28.

In this case, while the cover member 28 moves from the initial position to the locked position via the retracted position, the inner member moves relative to the cover member 28 by the cam protrusion moving in the guide path. Rotate to. The inner member restricts relative displacement of the cover member 28 in the proximal direction with respect to the inner member when the cover member 28 moves to the lock position.

Before use of the syringe 10A, a cap (not shown) made of a flexible resin material such as an elastomer covers the puncture needle 14. The cap is inserted into the cover member 28 so as to cover the puncture needle 14 so as to seal the needle tip 15 (the distal end opening of the puncture needle 14). When the syringe 10A is used, the cap is removed by the user pulling the tip and pulling it in the direction of the tip.

As shown in FIG. 2, slipping of the cover member 28 against the skin S is suppressed when the cover member 28 obliquely contacts the patient's skin S (see FIG. 3) to be punctured. A slip suppression unit 30 is provided. The slip suppression unit 30 extends in the circumferential direction.

In the present embodiment, the slip suppression unit 30 includes a protruding structure 32 protruding from the cover member 28. The protruding structure 32 is formed in an annular shape that protrudes radially outward from the outer peripheral surface of the cover member 28 and makes a round in the circumferential direction of the cover member 28. The protruding structure 32 is formed integrally with the cover member 28. The protruding structure 32 has a tip surface 33 that is substantially perpendicular to the axial direction of the cover member 28. In addition, the front-end | tip part of the protrusion structure 32 may be a taper outer surface where an outer diameter increases as it goes to a base end direction. Alternatively, a V-shaped groove that is recessed in the proximal direction may be provided at the distal end portion of the protruding structure 32.

The cover member 28 has a tip annular contact portion 34 having a curved surface 35 whose outer diameter decreases toward the tip direction on the tip side of the protrusion structure 32. The tip annular contact portion 34 surrounds the tip opening 29 and is formed so as to protrude in the tip direction with respect to the protruding structure 32. The outer diameter of the protrusion structure 32 is larger than the maximum outer diameter of the tip annular contact portion 34. The protruding height in the radial direction of the protrusion structure 32 from the tip annular contact portion 34 is, for example, 0.3 to 5 mm, and preferably 0.5 to 2 mm. The protrusion height of the protrusion structure 32 is one half of the difference between the outer diameter of the tip annular contact portion 34 and the outer diameter of the protrusion structure 32.

Next, the operation and effect of the syringe 10A configured as described above will be described.

When administering the drug solution M to the patient, the user (which may be the patient himself) first connects the pusher 18 to the gasket 16 to obtain the state shown in FIG. As shown in FIG. 1, the syringe 10 </ b> A may be provided to the user in a state where the pusher 18 is connected to the gasket 16 in advance.

Next, the user pulls out the cap from the cover member 28 by grasping and pulling the cap (not shown). At this time, the cover member 28 is biased to the initial position (pre-puncture position) by the elastic biasing force of the spring member described above, and the puncture needle 14 is surrounded by the cover member 28 up to the tip 15 of the tip. It is kept. This prevents the puncture needle 14 from being punctured carelessly by a user or the like.

Next, the user presses the distal end portion of the cover member 28 against the patient's puncture site (skin S such as an arm) to position the distal end portion of the cover member 28. The user may want to puncture the puncture needle 14 obliquely with respect to the skin S according to the preference or situation. In this case, as shown in FIG. 3, the cover member 28 comes into contact with the skin S in a state where the axial direction is oblique with respect to the skin S. That is, in the cover member 28, the annular tip surface does not contact the skin S, but only a part of the tip portion in the circumferential direction contacts the skin S.

In this case, since the protruding structure 32 provided at the tip of the cover member 28 bites into the skin S, the cover member 28 is prevented from sliding with respect to the skin S. Therefore, the cover member 28 can be easily held at the positioned position.

Next, when the user pushes the barrel 12 in the distal direction with the distal end portion of the cover member 28 pressed against the skin S, the cover member 28 resists the elastic biasing force of the spring member against the barrel 12. Relative displacement in the proximal direction. With such relative displacement, as shown in FIG. 4, the puncture needle 14 is exposed from the distal end opening 29 of the cover member 28 and is punctured by the patient.

Also in this case, since the protruding structure 32 provided at the tip of the cover member 28 bites into the skin S, the cover member 28 is prevented from sliding with respect to the skin S. Therefore, no extra force is applied in the direction perpendicular to the axial direction of the puncture needle 14 at the puncture site. Therefore, it is possible to prevent the pain and discomfort given to the patient during puncturing from increasing.

Next, the user presses the pusher 18 shown in FIG. 1 in the distal direction with the puncture needle 14 being punctured by the patient. Thereby, the drug solution M filled in the barrel 12 is discharged from the puncture needle 14 via the lumen of the puncture needle 14. As a result, the drug solution M is administered to the patient.

When the user pulls the cover member 28 together with the syringe 10A from the patient to remove the puncture needle 14 from the patient after the administration of the medicinal solution M, the cover member 28 is moved in the distal direction with respect to the barrel 12 by the elastic biasing force of the spring member. The needle tip 15 of the puncture needle 14 is covered with relative displacement. Thereby, inadvertent puncture can be avoided even after administration of the drug solution M to the patient.

As described above, according to the syringe 10A according to the present embodiment, since the slip suppression portion 30 is provided at the distal end portion of the cover member 28, the cover member 28 is brought into contact with the puncture target obliquely. Even in this case, the sliding of the cover member 28 with respect to the puncture target can be effectively suppressed. Therefore, the puncture needle 14 can be punctured accurately at the target site.

Further, in the present embodiment, since the slip suppression portion 30 is formed in an annular shape, it is possible to exert a slip suppression effect regardless of the circumferential position of the cover member 28 with respect to the puncture target.

In addition, in the present embodiment, since the slip suppression unit 30 has the protrusion structure 32 protruding from the cover member 28, the protrusion structure 32 bites into the puncture target at the time of contact with the puncture target, thereby providing a slip suppression function with a simple configuration. can get.

In particular, since the protrusion structure 32 protrudes from the outer peripheral surface of the cover member 28, the slip suppression function can be more effectively exhibited.

In the present embodiment, the cover member 28 has a curved surface whose outer diameter decreases in the distal direction from the protrusion structure 32, so that the slippage is suppressed while suppressing stimulation at the time of contact with the puncture target. be able to. Thereby, it is possible to prevent the pain and discomfort given to the patient during puncturing from increasing.

[Second Embodiment]
In the syringe 10B according to the second embodiment shown in FIG. 5, the slip suppression unit 30 that suppresses slipping with respect to the puncture target when the cover member 28 obliquely contacts the puncture target at the distal end portion of the cover member 28. The protrusion structure 40 is integrally provided. The protruding structure 40 is formed in an annular shape that protrudes radially outward from the outer peripheral surface of the cover member 28 and makes a round in the circumferential direction of the cover member 28.

The protrusion structure 40 has a plurality (three in the illustrated example) of protrusions arranged in the axial direction. Specifically, the protrusion structure 40 is provided on the proximal end side of the annular first protrusion 42, the annular second protrusion 44 provided on the proximal end side with respect to the first protrusion 42, and the second protrusion 44. And an annular third protrusion 46.

The adjacent protrusions of the plurality of protrusions are such that the proximal protrusion protrudes radially outward than the distal protrusion. Therefore, in the syringe 10 </ b> B, the outer diameter of the second protrusion 44 is larger than the outer diameter of the first protrusion 42. The outer diameter of the third protrusion 46 is larger than the outer diameter of the second protrusion 44.

The first protrusion 42, the second protrusion 44, and the third protrusion 46 have

front end surfaces

42a, 44a, 46a substantially perpendicular to the axial direction of the cover member 28, respectively. In addition, the front-end | tip part of the 1st protrusion 42, the 2nd protrusion 44, and the 3rd protrusion 46 may each be a taper outer surface where an outer diameter increases as it goes to a base end direction. Alternatively, V-shaped grooves that are recessed in the proximal direction may be provided at the distal ends of the first protrusion 42, the second protrusion 44, and the third protrusion 46, respectively.

The configuration of the other parts of the syringe 10B is the same as that of the syringe 10A according to the first embodiment.

Similarly to the syringe 10A according to the first embodiment described above, the syringe 10B including the protruding structure 40 configured as described above also applies the cover member 28 obliquely to the skin S of the patient to be punctured. The sliding of the cover member 28 with respect to the skin S when contacted can be effectively suppressed.

Moreover, according to this syringe 10B, since the protrusion structure 40 has a plurality of protrusions (first protrusion 42, second protrusion 44, and third protrusion 46) arranged in the axial direction, a better slip suppression function can be obtained. . Further, since the adjacent protrusions of the plurality of protrusions protrude outward in the radial direction from the protrusion on the distal end side, the protrusions on the proximal end side of the adjacent protrusions also bite into the skin S. In addition, the slip prevention function can be surely exhibited.

In addition, about the part which is common in 1st Embodiment among 2nd Embodiment, the same or similar operation | movement and effect as 1st Embodiment are acquired.

[Third Embodiment]
The syringe 10C according to the third embodiment shown in FIG. 6 is provided with an elastic member 52a made of an elastic material (elastomer) instead of the protruding structure 32 in the syringe 10A according to the first embodiment. . That is, an elastic member 52a is provided at the distal end portion of the cover member 28a as the slip suppression portion 30 that suppresses slipping on the skin S when the cover member 28a obliquely contacts the skin S that is the puncture target. ing.

Specifically, the cover member 28 a includes a cover member main body 48 and an elastic member 52 a attached to the tip of the cover member main body 48. The cover member main body 48 corresponds to the cover member 28 in the first embodiment in which the protruding structure 32 is eliminated.

Examples of the elastic material constituting the elastic member 52a include various rubber materials such as natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicone rubber, polyurethane, polyester, polyamide, and olefin. , Various thermoplastic elastomers such as styrene, or a mixture thereof.

The elastic member 52 a is formed in an annular shape along the circular front end surface of the cover member main body 48. A recess 55 is provided on the base end surface of the elastic member 52a. A protrusion 57 protruding in the distal direction is provided on the distal end surface of the cover member 28a. The elastic member 52 a is fixed to the cover member main body 48 by fitting the projection 57 into the concave portion 55. In addition, the recessed part 55 and the processus | protrusion 57 may each be provided cyclically | annularly, or multiple may be provided at intervals in the circumferential direction. The hole 53 of the elastic member 52a communicates with the tip opening 29 of the cover member 28a. In FIG. 6, the diameter of the hole 53 (the inner diameter of the elastic member 52 a) is slightly larger than the diameter of the tip opening 29 of the cover member main body 48. The diameter of the hole 53 may be the same as or smaller than the diameter of the tip opening 29 of the cover member 28 a.

The friction coefficient between the elastic member 52a and the skin S is larger than the friction coefficient between the cover member main body 48 and the skin S. Therefore, the elastic member 52 a is less slidable with respect to the skin S than the cover member main body 48.

The other parts of the syringe 10C are configured in the same manner as the syringe 10A according to the first embodiment.

According to the syringe 10C including the elastic member 52a configured as described above, in order to position the cover member 28a with respect to the skin S in a state where the needle tip 15 of the puncture needle 14 is covered with the cover member 28a, When the tip of the cover member 28a is brought into contact with the skin S, the elastic member 52a provided at the most distal end of the syringe 10C comes into contact with the skin S. Therefore, even when the cover member 28a is brought into contact with the skin S at an angle, the elastic member 52a prevents the cover member 28a from sliding on the skin S. Therefore, the cover member 28a can be easily held at a position where it is desired to position.

As described above, when the cover member 28a is obliquely brought into contact with the skin S of the patient that is the puncture target, the cover member 28a is also provided by the syringe 10C, similarly to the syringe 10A according to the first embodiment described above. Can be effectively suppressed from slipping on the skin S.

In particular, in this syringe 10C, the slip suppression unit 30 is an elastic member 52a made of an elastic material, so that a favorable slip suppression function can be obtained while suppressing irritation at the time of contact with the skin S. Further, since the elastic member 52a is fixed to the distal end surface of the cover member main body 48, the elastic member 52a can be easily provided at the distal end portion of the cover member 28a.

In addition, about the part which is common in 1st Embodiment among 3rd Embodiment, the same or similar operation | movement and effect as 1st Embodiment are acquired.

[Fourth Embodiment]
The cover member 28a of the syringe 10D according to the fourth embodiment shown in FIG. 7 includes a cover member main body 48 and an elastic member 52b made of an elastic material fixed to the distal end portion of the cover member main body 48. The elastic member 52b functions as a slip suppression unit 30 that suppresses slipping on the skin S when the cover member 28a obliquely contacts the skin S that is the puncture target. The elastic member 52b can be made of the same material as the elastic member 52a in the third embodiment.

The elastic member 52b is formed in an annular shape. The elastic member 52b covers the distal end portion of the cover member main body 48 from the outer peripheral surface 48a to the distal end surface 48b. The elastic member 52b has a hole 53 that communicates with the tip opening 29 of the cover member 28a. On the inner peripheral surface of the elastic member 52b, an engagement protrusion 56 that protrudes radially inward is provided. The engagement protrusion 56 is an annular protrusion that extends in the circumferential direction. The engaging protrusions 56 may be a plurality of protrusions provided at intervals in the circumferential direction.

The outer peripheral surface 48a of the front-end | tip part of the cover member main body 48 is provided with the engaging groove 58 dented to radial inside. The engagement groove 58 is an annular groove extending in the circumferential direction. When the engagement protrusion 56 includes a plurality of protrusions, the engagement groove 58 may be a plurality of grooves provided at intervals in the circumferential direction. The elastic member 52 b is fixed to the distal end portion of the cover member main body 48 by the engagement protrusion 56 and the engagement groove 58 engaging with each other.

The elastic member 52 b includes a peripheral wall portion 60 that surrounds the outer peripheral surface 48 a of the distal end portion of the cover member main body 48, and a distal end curved portion 62 that curves radially inward from the distal end of the peripheral wall portion 60 and surrounds the hole portion 53. The outer diameter and inner diameter of the peripheral wall portion 60 decrease toward the distal end direction. The outer diameter and inner diameter of the peripheral wall portion 60 may be constant in the axial direction. The inner peripheral surface 60 a of the peripheral wall portion 60 is in contact with the outer peripheral surface 48 a of the tip portion of the cover member main body 48. The proximal end surface 62 a of the distal end bending portion 62 is in contact with the distal end surface 48 b of the distal end portion of the cover member main body 48.

The other parts of the syringe 10D are configured in the same manner as the syringe 10A according to the first embodiment.

Similarly to the above-described syringes 10A to 10C, the syringe 10D including the elastic member 52b configured as described above also has the cover member 28a obliquely brought into contact with the skin S of the patient to be punctured. In addition, it is possible to effectively prevent the cover member 28a from slipping on the puncture target. Moreover, in this syringe 10D, since the slip suppression part 30 is the elastic member 52b comprised with the elastic material, a favorable slip suppression function is obtained, suppressing the irritation | stimulation at the time of the contact with the skin S.

In particular, in this syringe 10D, the elastic member 52b covers the distal end portion of the cover member main body 48 from the outer peripheral surface 48a to the distal end surface 48b, and therefore the puncture target regardless of the puncture angle of the puncture needle 14 with respect to the puncture target. Can be effectively suppressed.

In addition, about the part which is common in 1st Embodiment among 4th Embodiment, the same or similar operation | movement and effect as 1st Embodiment are acquired.

[Fifth Embodiment]
The cover member 28a of the syringe 10E according to the fifth embodiment shown in FIG. 8 includes a cover member main body 48 and an elastic member 52c made of an elastic material fixed to the distal end portion of the cover member main body 48. The elastic member 52c functions as the slip suppression unit 30 that suppresses slipping on the puncture target when the cover member 28a is in contact with the puncture target at an angle. The elastic member 52c can be made of the same material as the elastic member 52a in the third embodiment.

The elastic member 52 c is formed in an annular shape, and has a hole 63 that penetrates in the axial direction and communicates with the inner cavity of the cover member main body 48. The puncture needle 14 can project in the distal direction of the cover member 28a through the hole 63. The elastic member 52c has a concave portion 66 that engages with the convex portion 64 provided on the inner peripheral portion of the front end of the cover member main body 48, and is fitted inside the front end portion of the cover member 28a.

The recess 66 is formed in an annular shape that is recessed inward in the radial direction from the outer peripheral surface of the elastic member 52c and extends once in the circumferential direction. The convex portion 64 is formed in an annular shape that protrudes inward in the radial direction and extends around the circumference in the circumferential direction. The elastic member 52 c is fixed to the distal end portion of the cover member main body 48 by engaging the concave portion 66 and the convex portion 64.

Similarly to the above-described syringes 10A to 10D, the syringe 10E provided with the elastic member 52c configured as described above also causes the cover member 28a to be in contact with the skin S of the patient to be punctured obliquely. In addition, the sliding of the cover member 28a with respect to the skin S can be effectively suppressed. Moreover, in this syringe 10E, since the slip suppression part 30 is the elastic member 52c comprised with the elastic material, a favorable slip suppression function is obtained, suppressing the irritation | stimulation at the time of the contact with the skin S.

In particular, in the syringe 10E, the elastic member 52c has a concave portion 66 that engages with the convex portion 64 provided on the inner peripheral portion of the front end of the cover member main body 48, and fits inside the front end portion of the cover member main body 48. Therefore, the elastic member 52c can be easily assembled to the cover member main body 48 in the assembly process.

In addition, about the part which is common in 1st Embodiment among 5th Embodiment, the same or similar operation | movement and effect as 1st Embodiment are acquired.

[Sixth Embodiment]
The cover member 28a of the syringe 10F according to the sixth embodiment shown in FIG. 9 includes a cover member main body 48 and an elastic member 52d made of an elastic material fixed to the distal end portion of the cover member main body 48. The elastic member 52d functions as the slip suppression unit 30 that suppresses slipping on the skin S when the cover member 28a is in contact with the skin S that is a puncture target obliquely. The elastic member 52d can be made of the same material as the elastic member 52a in the third embodiment.

The elastic member 52d is formed in an annular shape surrounding the tip of the cover member main body 48. The elastic member 52 d is fitted in a groove 68 provided at the tip of the cover member main body 48. The elastic member 52d is fixed to the tip of the cover member main body 48 by fitting the inner peripheral portion of the elastic member 52d into the groove 68. The elastic member 52d protrudes radially outward from the outer peripheral surface 48a of the front end portion of the cover member main body 48. The groove portion 68 is formed in an annular shape that is recessed radially inward from the outer peripheral surface 48a of the distal end portion of the cover member main body 48 and extends one round in the circumferential direction.

Also with the syringe 10F configured as described above, when the cover member 28a is obliquely brought into contact with the skin S of the patient to be punctured, as in the syringes 10A to 10E described above, the cover member 28a is It is possible to effectively suppress sliding with respect to the puncture target. Moreover, in this syringe 10F, since the slip suppression part 30 is the elastic member 52d comprised with the elastic material, a favorable slip suppression function is obtained, suppressing the irritation | stimulation at the time of the contact with the skin S.

In particular, in this syringe 10F, the elastic member 52d is fitted into the groove 68 provided at the distal end portion of the cover member main body 48 and protrudes from the outer peripheral surface 48a of the distal end portion of the cover member main body 48. The amount of material used can be suppressed. In the assembly process, the elastic member 52d can be easily assembled to the cover member main body 48.

In addition, about the part which is common in 1st Embodiment among 6th Embodiment, the same operation | movement and effect as 1st Embodiment are obtained.

In the above-described syringes 10C to 10F, the protrusion structure 32 (FIG. 2) or the protrusion structure 40 (FIG. 5) may be integrally provided on the outer periphery of the elastic members 52a to 52d. In this case, the protruding

structures

32 and 40 are made of an elastic material.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

Claims

Barrel (12),
A puncture needle (14) protruding in the distal direction from the distal end of the barrel (12) and having a needle tip (15) at the distal end;
A hollow cylindrical cover member (28, 28a) that is axially displaceable relative to the barrel (12), and in the initial state, the cover member (28, 28a) is at least the puncture needle (14). Covering part of the cover member (28, 28a) relative to the barrel (12) in the proximal direction by being pressed against the puncture target when the puncture needle (14) punctures the puncture target A protective device (20) configured to be displaced and cover the needle tip (15) with the cover member (28, 28a) after puncturing the puncture needle (14) to the puncture target,
The front end of the cover member (28, 28a) extends in the circumferential direction, and suppresses slipping on the puncture target when the cover member (28, 28a) abuts against the puncture target obliquely. A slip suppression part (30) is provided,
A syringe (10A to 10F) characterized by the above.
The syringe (10A-10F) according to claim 1,
The slip suppression part (30) is formed in an annular shape,
A syringe (10A to 10F) characterized by the above.
The syringe (10A, 10B) according to claim 1 or 2,
The slip suppression portion (30) has a protruding structure (32, 40) protruding radially outward from the cover member (28).
The syringe (10A, 10B) characterized by this.
The syringe (10A, 10B) according to claim 3,
The protruding structure (32, 40) protrudes from the outer peripheral surface of the cover member (28).
The syringe (10A, 10B) characterized by this.
The syringe (10B) according to claim 4,
The protrusion structure (40) has a plurality of protrusions (42, 44, 46) arranged in the axial direction.
The syringe (10B) according to claim 5,
Among the plurality of protrusions (42, 44, 46), the protrusions adjacent to each other protrude from the protrusions on the proximal end side toward the radially outer side than the protrusions on the distal end side.
The syringe (10B) characterized by the above-mentioned.
The syringe (10A, 10B) according to any one of claims 3 to 6,
The protruding structure (32, 40) has a tip surface (33, 42a) perpendicular to the axial direction.
The syringe (10A, 10B) characterized by this.
The syringe (10A, 10B) according to any one of claims 3 to 7,
The syringe (10A, 10B), wherein the cover member (28) has a curved surface (35) whose outer diameter decreases in the distal direction from the protrusion structure (32, 40) toward the distal end. .
The syringe (10C to 10F) according to claim 1 or 2,
The cover member (28a) includes a cover member main body (48), and the slip suppression portion (30) fixed to a tip end portion of the cover member main body (48).
The slip suppression part (30) is an elastic member (52a to 52d) made of an elastic material.
A syringe (10C to 10F) characterized by the above.
The syringe (10C) of claim 9,
The elastic member (52a) is fixed to the front end surface of the cover member body (48).
A syringe (10C) characterized in that.
The syringe (10D) of claim 9,
The elastic member (52b) covers the distal end portion of the cover member main body (48) from the outer peripheral surface to the distal end surface.
The syringe (10D) characterized by this.
The syringe (10E) according to claim 9,
The elastic member (52c) has a concave portion (66) that engages with a convex portion (64) provided on the inner peripheral portion of the tip of the cover member main body (48), and the tip of the cover member main body (48). Fitted inside the part,
A syringe (10E) characterized in that.
The syringe (10F) according to claim 9,
The elastic member (52d) is fitted into a groove (68) provided at the tip of the cover member main body (48) and protrudes from the outer peripheral surface of the tip.
The syringe (10F) characterized by this.
The syringe (10A to 10F) according to any one of claims 1 to 13,
A gasket (16) slidably inserted into the barrel (12);
A pusher (18) connected to or connectable to the gasket (16);
A chemical solution filled in a liquid chamber formed by the barrel (12) and the gasket (16),
A syringe (10A to 10F) characterized by the above.