JP3770738B2 - Shielded syringe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a shielded syringe for preventing erroneous puncture by an injection needle in a syringe for injecting a medical solution or the like into a living body or the like.
[0002]
[Prior art]
Various syringes such as Japanese Patent Laid-Open Nos. 6-39036 and 9-117507 are disclosed as a syringe provided with a shield that can be moved in the axial direction in order to prevent erroneous piercing by an injection needle. However, these syringes are fixed only by a non-releasable fixing mechanism at a position where the shield covers the injection needle. Therefore, if the syringe is covered with a shield when the syringe is temporarily left after aspirating or collecting blood from an ampoule or the like that is being used in an actual medical field, the shield is fixed at that position, so that later work can be performed. Disappear.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a shielded syringe capable of covering an injection needle with a shield even when the syringe is temporarily left in use in view of the above-described drawbacks of the conventional shielded syringe.
[0005]
[Means for Solving the Problems]
The above object is solved by the present invention described below.
(1) The present invention includes an outer cylinder that has an adapter that can be attached and detached at the tip, and connects an injection needle via the adapter, a plunger that is slidably accommodated in the outer cylinder, and the outer cylinder And a shield that can move in the axial direction,
The adapter and the shield are a shielded syringe having a temporary fixing means for temporarily fixing the shield in the proximal direction and a temporary fixing means for temporarily fixing the shield in the distal direction,
The temporary fixing means is a syringe with a shield which is an elastic part provided in the adapter and extending in the outer peripheral direction, and an opening provided in the shield that can accommodate the elastic part or a recess that opens in the inner peripheral direction.
[0006]
(2) The present invention is the shielded syringe according to (1) above, wherein the adapter and the shield further include a fixing means for fixing the shield in the distal direction from a position where it is temporarily fixed in the distal direction. .
(3) This invention is a syringe with a shield as described in said (1) thru | or (2) by which the said outer cylinder is isolate | separated from the said adapter, when the said shield is fixed with the said adapter in the front end direction.
[0007]
(4) The present invention includes an outer cylinder that has an adapter that can be attached and detached at the tip, and connects an injection needle via the adapter, a plunger that is slidably accommodated in the outer cylinder, and the outer cylinder In a shielded syringe consisting of a shield capable of moving in the axial direction
The adapter is provided with an elastic body extending in the outer circumferential direction, and the shield is provided with an opening capable of accommodating the elastic portion or a recess opening in the inner circumferential direction in the distal direction and the proximal direction.
When the shield is positioned in the proximal direction, the elastic portion and the opening that can accommodate the elastic portion provided in the distal direction of the shield or the recess that opens in the inner circumferential direction are engaged. And
By rotating the shield in the axial direction or in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the distal direction.
When the shield is positioned in the front end direction, the elastic portion is engaged by extending in an opening capable of accommodating the elastic portion provided in the rear end direction of the shield or a recess opening in the inner circumferential direction. Combined
By rotating the shield in the axial direction or in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the proximal direction. It is a syringe.
[0008]
(5) The present invention includes an outer cylinder that has an adapter that can be attached and detached at the tip, and that connects an injection needle via the adapter, a plunger that is slidably housed in the outer cylinder, and the outer cylinder In a shielded syringe consisting of a shield capable of moving in the axial direction
The adapter is provided with an elastic portion and an engaging portion extending in the outer peripheral direction, and the shield is provided with an opening that can accommodate the elastic portion in the distal end direction and the proximal end direction, or a recess and a locking portion that opens in the inner peripheral direction. And is provided,
When the shield is positioned in the proximal direction, the elastic portion and the opening that can accommodate the elastic portion provided in the distal direction of the shield or the recess that opens in the inner circumferential direction are engaged. And
By rotating the shield in the axial direction or in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the distal direction.
When the shield is positioned in the front end direction, the elastic portion is engaged by extending in an opening capable of accommodating the elastic portion provided in the rear end direction of the shield or a recess opening in the inner circumferential direction. Combined
When the shield is axially rotated or moved in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the proximal direction.
Finally, the tip of the elastic part further extends from the position where the elastic part provided in the rear end direction of the shield is engaged by extending in the opening that can accommodate the elastic part or in the recess opening in the inner circumferential direction. The shield that enables the adapter and the outer cylinder to be separated by fixing the shield and the adapter by locking the engaging portion to the locking portion at a position moved in the direction. It is an attached syringe.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a shielded syringe according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a shielded syringe 1 according to the present invention, and FIG. 2 is a cross-sectional view of the shielded syringe 1. The syringe 1 with a shield includes an outer cylinder 2, an adapter 3, a shield 4, a plunger 5, and an injection needle 6.
[0010]
The outer cylinder 2 is made of a cylindrical body, in which a gasket 51 provided on the plunger 5 can slide in a liquid-tight manner, and the adapter 3 can be joined to the tip. The joining means with the adapter 3 is preferably a screwing means because it can be firmly connected and can be reliably and easily released, but may be a fitting means using a male taper and a female taper. In addition, it is desirable to provide the outer cylinder 2 with a flange 21 in consideration of operability, and the outer cylinder 2 is configured with appropriate dimensions so that the shield 4 can move smoothly in the axial direction. Moreover, the space 22 sealed with the gasket 51 is formed, and a chemical | medical agent is accommodated as needed.
[0011]
The adapter 3 connects the distal end of the outer cylinder to the proximal end and joins the injection needle 6 to the distal end. Further, the adapter 3 is provided with an elastic portion 31 as shown in FIG. 3 which is a partial sectional view and FIG. 4 which is a sectional view taken along line AA ′ in FIG. The elastic portion 31 extends as shown in FIG. 4 when not pressed against the inner surface of the shield 4. When the shield 4 is axially rotated or moved in the axial direction and pressed against the inner surface of the shield 4, FIG. As shown in the drawing, there is no particular limitation as long as it has an elastic force to contract, but considering that the injection / injection operation is repeated several times, the plunger 4 is reciprocated several times in the axial direction. It is desirable that the shape is not pressed against the inner surface of the shield 4 when moved in the direction.
[0012]
Specifically, the elastic portion 31 is shown in FIG. 4 and FIG. 5 in consideration of the strength of the connecting portion with the adapter 3 and the ease of contraction and the contraction when the shield 4 moves in the axial direction. An M-shaped one that is integrally formed with the adapter 3 and has a trough 32 at the apex thereof is desirable, but an inverted U-shape that does not have a trough, and a leaf spring-like shape that is fixed to the adapter 3 and extends obliquely. It may be a thing or a coil-like thing extended outward. Moreover, it may be fixed by a method such as bonding by adhesion or fusion as a separate member, or a method in which a cut is made on the surface of the adapter 3 and pinched there without being integrally formed. The elastic portion 31 is desirably integrally formed of the same material, but is not particularly limited, and may be a thermoplastic elastomer or rubber.
[0013]
Furthermore, the adapter 3 is provided with a first engagement portion 33 extending outward and a second engagement portion 34 having a concave shape. Specifically, in the present embodiment, the second engagement portion 34 is formed by four recesses provided on the outer surface of the proximal end of the adapter 3 so as to extend in the axial direction with a spacing of 20 degrees. Yes.
[0014]
The shield 4 is provided with an opening 41 in the distal direction and an opening 42 in the proximal direction. Both openings are preferably openings that penetrate to the outer surface because they can be pushed with a finger when releasing the temporary fixation described later, but they are not openings that penetrate to the outer surface, but recesses that open only in the inner surface direction. Good. Further, a plurality of openings may exist on the same circumference of the shaft rotation. Further, the shield 4 is provided with a first engaging portion 43 and a second engaging portion 44 extending inward.
[0015]
The elastic part 31 of the adapter 3 and the opening part 41 in the distal direction of the shield 4 form a temporary fixing means (first temporary fixing means) when the shield 4 is positioned in the proximal direction. The temporary fixing means (second temporary fixing means) in the case where the shield 4 is positioned in the distal direction is formed by the opening 42 in the proximal direction of the four.
[0016]
Further, the first engaging portion 33 of the adapter 3 and the first locking portion 43 of the shield 4 are fixing means for fixing the shield 4 at a fixing position where the shield 4 is moved further in the distal direction than the temporary fixing position by the second temporary fixing means. Form. The shapes of the first engaging portion 33 and the first locking portion 43 can pass when the shield 4 is moved further in the distal direction than the temporary fixing position by the second temporary fixing means, but does not move in the reverse direction. Although it will not specifically limit if it is a thing, Specifically, what is a processus | protrusion in which at least one cross section has a slope is mention | raise | lifted. In the present embodiment, the first engaging portion 33 is continuous on the circumference, and the details of the first locking portion 43 are shown in FIG. Although it is provided, both of them may be provided with a constant interval on the circumference as long as they cannot pass each other, and at least one of them is provided with a constant interval on the circumference. This is desirable because the deformation of the shielded syringe 1 during passage can be reduced. However, both may be provided continuously on the circumference.
[0017]
Further, the second engaging portion 34 of the adapter 3 and the second locking portion 44 of the shield 4 form a means for preventing the adapter 3 from rotating at the fixed position. That is, when the outer cylinder 2 and the adapter 3 are joined by screwing means, when the outer cylinder 2 is pivoted, the second engaging portion 34 is locked to the second locking portion 44 and the shaft of the adapter 3 is The outer cylinder 2 is removed by preventing the rotation and the joining by the screwing means, and the adapter 3 and the injection needle 6 can be accommodated in the shield 4. In the present embodiment, the second engaging portion 34 and the second locking portion 44 have a concave shape and the second locking portion 44 has a convex shape. There is no problem even if it is a thing. Further, it is desirable that the second engagement portion 34 has a notch 35 that is pointed in the base end direction so as to be surely and easily locked, and the second engagement portion 34 has a notch The shape has.
[0018]
As shown in FIG. 6, the shield 4 is preferably provided with guide ribs 45 on the inner surface. The guiding rib 45 may be linear in the axial direction or may be spiral. The elastic portion 31 of the adapter 3 can be naturally and easily guided to the opening portion 41 in the distal end direction or the opening portion 42 in the proximal end direction of the shield 4 by the guiding rib 45. The guiding rib 45 is desirably provided separately with a guiding rib that leads to the opening 41 in the distal direction of the shield 4 and a guiding rib that leads to the opening 42 in the proximal direction. In this embodiment, a guiding rib 45a that leads to the opening 41 in the distal direction and a guiding rib b that leads to the opening 42 in the proximal direction are provided.
[0019]
In the present embodiment, the trough portion 32 formed at the apex of the elastic portion 31 of the adapter 3 is fitted to the guiding rib 45 and moves along the guiding rib 45. However, the present invention is not limited to this. A recess (not shown) corresponding to the guiding rib 45 is provided on the sliding surface between the shield 4 and the inner surface of the shield 4, or the first engaging portions 33 of the adapter 3 are arranged at regular intervals on the circumference. The space generated by the intervals may correspond to the guiding rib 45.
[0020]
The injection needle 6 has a puncture blade surface at the distal end, and the proximal end is inserted into the injection needle hub 61 and fixed liquid-tightly with an adhesive without closing the injection needle 6. The injection needle hub 61 is provided with a flange 62 extending in a direction perpendicular to the axial direction on the outer surface of the base end, and is screwed into and fixed to a screwing means 37 provided in the injection needle holding portion 36 of the adapter 3. Is done. The joining means is preferably a screwing means because it can be firmly connected and can be reliably and easily released, but it may be a fitting means using a male taper and a female taper. The injection needle 6 is preferably covered with a protector 63 before use.
[0021]
The material of each component of the shielded syringe 1 is not particularly limited. For example, polyvinyl chloride, polyethylene, polypropylene, polystyrene, poly- (4-methylpentene-1), polycarbonate, acrylic resin, acrylonitrile-butadiene. -Styrene copolymer, polyester such as polyethylene terephthalate, butadiene-styrene copolymer, cyclic polyolefin, polyphenylene sulfide, polyamide (for example, nylon 6, nylon 6,6, nylon 6,10, nylon 12) Resin. In addition to the above, for the gasket 51, for example, natural rubber, isoprene rubber, butyl rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, acrylic rubber, fluorine rubber, silicone rubber, latex rubber, various rubber materials, polyurethane Examples thereof include elastic materials such as various elastomers such as polyesters, polyesters, polyamides, olefins, and styrenes, and mixtures thereof, and the elastic portion 31 includes materials similar to the gasket 51 and various metals. Furthermore, examples of the material of the injection needle 6 include stainless steel.
[0022]
Hereinafter, the usage method of the syringe 1 with a shield is demonstrated.
A. Usage as a syringe for testing body fluid components such as blood.
(1) Prepare several shielded syringes 1.
(2) Remove the protector 62 from one of the shielded syringes 1 as shown in FIGS. 1 and 2 to expose the injection needle 6.
(3) The injection needle of one shielded syringe 1 is punctured on the surface of the living body, and the plunger 5 is pulled to suck body fluid such as blood into the outer cylinder 2. At this time, when an anticoagulant or the like is sealed in the space 22 in the outer cylinder 2 in advance, it is mixed well with the sucked medicine.
[0023]
(4) Rotate the shield 4 of the one syringe 1 with shield in the axial direction by 90 degrees to release the first temporary fixing means by the elastic portion 31 of the adapter 3 and the opening 41 in the distal direction of the shield 4, and the elastic portion The trough 32 of 31 is fitted to the guiding rib 45b. Thereafter, when the shield 21 is moved toward the distal end of the outer cylinder 2 by grasping the flange 21, the second temporary fixing means by the elastic part 31 of the adapter 3 and the opening 42 in the proximal direction of the shield 4 as shown in FIG. Is temporarily fixed.
(5) Repeat steps (2) to (4) for the other shielded syringes 1. During this time, since the syringe needle 6 is not exposed, the shielded syringe 1 that is not inhaling body fluid can be operated safely and hygienically.
[0024]
(6) The shield 4 of the syringe 1 with shield is rotated 90 degrees in the axial direction to release the second temporary fixing means by the elastic portion 31 of the adapter 3 and the opening 42 in the proximal direction of the shield 4, and the elasticity The trough portion 32 of the portion 31 is fitted to the guiding rib 45a. Thereafter, when the shield 21 is moved in the proximal direction of the outer cylinder 2 by grasping the flange 21, the first temporary fixing means by the elastic portion 31 of the adapter 3 and the opening portion 41 in the distal direction of the shield 4 as in the original state. Is temporarily fixed. Thereafter, the tip of the injection cylinder 6 or the outer cylinder from which the injection needle 6 has been removed is inserted into a test tube or a test apparatus, and body fluid is injected by pushing in the plunger 5.
[0025]
(7) Rotate the shield 4 of the one syringe 1 with shield in the axial direction within 90 degrees to release the first temporary fixing means by the elastic part 31 of the adapter 3 and the opening 41 in the distal direction of the shield 4, and the flange 21 To move the shield 4 toward the distal end of the outer cylinder 2. At this time, since the shaft rotation of the shield 4 is within 90 degrees, the trough portion 32 of the elastic portion 31 passes through the position of the second temporary fixing means without fitting into the guiding rib 45b, and the adapter 3 The engaging portion 33 is locked to the first locking portion 43 of the shield 4. The state is shown in FIG.
In (7), as in (4), after temporarily fixing with the second temporary fixing means, the shield 4 is rotated in the axial direction to release the second temporary fixing means, and further the shield in the distal direction. 4 may be moved, and the first engagement portion 33 of the adapter 3 may be engaged with the first engagement portion 43 of the shield 4.
[0026]
(8) When the outer cylinder 2 is pivoted, the second engagement portion 34 is latched by the second latching portion 44 to prevent the adapter 3 from pivoting, and the outer cylinder 2 and the adapter 3 are screwed together. The outer cylinder 2 can be removed by releasing the joining. Thereby, the outer cylinder 2 including the injection needle 6 and the plunger 5 can be separated and discarded. In particular, the injection needle 6 can be safely discarded while being covered with the shield 4.
(9) Repeat steps (6) to (8) for the other shielded syringes 1. In the meantime, since the injection needle 6 is not exposed, the shielded syringe 1 that is not injecting can be operated safely and hygienically.
[0027]
B. Usage as a syringe for mixed drug injection.
(1) Prepare several shielded syringes 1.
(2) Remove the protector 62 from one of the shielded syringes 1 as shown in FIGS. 1 and 2 to expose the injection needle 6.
(3) The syringe needle of one shielded syringe 1 is inserted into an ampule or the like and the plunger 5 is pulled to suck the drug into the outer cylinder 2. At this time, when the medicine is sealed in the space 22 in the outer cylinder 2 in advance, it is mixed well with the sucked medicine.
[0028]
(4) Rotate the shield 4 of the one syringe 1 with shield in the axial direction by 90 degrees to release the first temporary fixing means by the elastic portion 31 of the adapter 3 and the opening 41 in the distal direction of the shield 4, and the elastic portion The trough 32 of 31 is fitted to the guiding rib 45b. Thereafter, when the shield 21 is moved toward the distal end of the outer cylinder 2 by grasping the flange 21, the second temporary fixing means by the elastic part 31 of the adapter 3 and the opening 42 in the proximal direction of the shield 4 as shown in FIG. Is temporarily fixed.
(5) Repeat steps (2) to (4) for the other shielded syringes 1. During this time, since the syringe needle 6 is not exposed, the shielded syringe 1 that is not inhaling medicine can be operated safely and hygienically.
[0029]
(6) When sucking and mixing a plurality of medicines into the shielded syringe 1, the operations from (2) to (5) are repeated.
(7) The shield 4 of the one syringe 1 with shield is rotated 90 degrees in the axial direction to release the second temporary fixing means by the elastic portion 31 of the adapter 3 and the opening 42 in the proximal direction of the shield 4 and elastic The trough portion 32 of the portion 31 is fitted to the guiding rib 45a. Thereafter, when the shield 21 is moved in the proximal direction of the outer cylinder 2 by grasping the flange 21, the first temporary fixing means by the elastic portion 31 of the adapter 3 and the opening portion 41 in the distal direction of the shield 4 as in the original state. Is temporarily fixed. Thereafter, the needle 6 is punctured on the surface of the living body or a container containing the medicine, and the plunger 5 is pushed in to inject the sucked medicine.
[0030]
(8) Rotate the shield 4 of one syringe 1 with shield in the axial direction within 90 degrees to release the first temporary fixing means by the elastic part 31 of the adapter 3 and the opening 41 in the distal direction of the shield 4, and the flange 21 To move the shield 4 toward the distal end of the outer cylinder 2. At this time, since the shaft rotation of the shield 4 is within 90 degrees, the trough portion 32 of the elastic portion 31 passes through the position of the second temporary fixing means without fitting into the guiding rib 45b, and the adapter 3 The engaging portion 33 is locked to the first locking portion 43 of the shield 4. The state is shown in FIG.
In (8), as in (4), after being temporarily fixed by the second temporary fixing means, the shield 4 is rotated in the axial direction to release the second temporary fixing means, and further the shield in the distal direction. 4 may be moved, and the first engagement portion 33 of the adapter 3 may be engaged with the first engagement portion 43 of the shield 4.
[0031]
(9) When the outer cylinder 2 is pivoted, the second engagement portion 34 is latched by the second latching portion 44 to prevent the adapter 3 from pivoting, and the outer cylinder 2 and the adapter 3 are screwed together. The outer cylinder 2 can be removed by releasing the joining. Thereby, the outer cylinder 2 including the injection needle 6 and the plunger 5 can be separated and discarded. In particular, the injection needle 6 can be safely discarded while being covered with the shield 4.
(10) Repeat steps (7) to (9) for the other shielded syringes 1. During this time, the shielded syringe 1 that is not injecting medicine can be operated safely and hygienically because the injection needle 6 is not exposed.
[0032]
【The invention's effect】
Like the conventional shielded syringe, the shielded syringe of the present invention does not require re-encapsulation of the protector after completion of suction and injection, and can easily and safely encapsulate the injection needle by fixing the shield. However, by providing the temporary fixing means, the injection needle encapsulated by the shield can be exposed again even during the work, and suction and injection can be performed again.
In addition, after fixation, the injection needle side, which is an infectious metal waste, can be easily and safely detached from the outer cylinder, and can be separated and discarded. Therefore, it is possible to improve the disposal efficiency and safety in medical facilities.
[Brief description of the drawings]
FIG. 1 is a front view of a shielded syringe 1 according to the present invention.
FIG. 2 is a cross-sectional view of the shielded syringe 1. FIG.
FIG. 3 is a partial cross-sectional view of an adapter 3;
FIG. 4 is a cross-sectional view taken along line AA ′ in FIG. 3;
FIG. 5 is a cross-sectional view showing a usage pattern of an elastic part 31 in FIG. 4;
FIG. 6 is a cross-sectional view of the outer cylinder 2;
FIG. 7 is a cross-sectional view showing how the shielded syringe 1 is used.
FIG. 8 is a cross-sectional view showing how the shielded syringe 1 is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Syringe with a shield 2 Outer cylinder 21 Flange 22 Space 3 Adapter 31 Elastic part 32 Valley part 33 First engagement part 34 Second engagement part 35 Notch part 4 Shield 41 Opening 42 in the front end direction Opening part in the rear end direction 43 1st latching | locking part 44 2nd latching | locking part 45a, 45b Guide rib 5 Plunger 51 Gasket

Claims (5)

An outer cylinder having a detachable adapter at the distal end, to which an injection needle is connected via the adapter, a plunger slidably housed in the outer cylinder, and encasing the outer cylinder and axially Consists of a shield that can move to
The adapter and the shield are a shielded syringe having a temporary fixing means for temporarily fixing the shield in the proximal direction and a temporary fixing means for temporarily fixing the shield in the distal direction,
The temporary fixing means is a syringe with a shield, which is an elastic part provided in the adapter and extending in the outer peripheral direction, and an opening provided in the shield and accommodating the elastic part or a recess opening in the inner peripheral direction. The syringe with a shield according to claim 1, wherein the adapter and the shield further have a fixing means for fixing the shield in the distal direction from a position where the distal end direction is temporarily fixed. The syringe with a shield according to claim 1 or 2, wherein the outer cylinder is separated from the adapter by fixing the shield to the adapter in a distal direction. An outer cylinder having a detachable adapter at the distal end, to which an injection needle is connected via the adapter, a plunger slidably housed in the outer cylinder, and encasing the outer cylinder and axially In a shielded syringe consisting of a shield that can be moved to
The adapter is provided with an elastic part extending in the outer peripheral direction, and the shield is provided with an opening capable of accommodating the elastic part in the distal direction and the proximal direction or a recess opening in the inner peripheral direction,
When the shield is positioned in the proximal direction, the elastic portion and the opening that can accommodate the elastic portion provided in the distal direction of the shield or the recess that opens in the inner circumferential direction are engaged. And
By rotating the shield in the axial direction or in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the distal direction.
When the shield is positioned in the front end direction, the elastic portion is engaged by extending in an opening capable of accommodating the elastic portion provided in the rear end direction of the shield or a recess opening in the inner circumferential direction. Combined
By rotating the shield in the axial direction or in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the proximal direction. Syringe. An outer cylinder having a detachable adapter at the distal end, to which an injection needle is connected via the adapter, a plunger slidably housed in the outer cylinder, and encasing the outer cylinder and axially In a shielded syringe consisting of a shield that can be moved to
The adapter is provided with an elastic portion and an engaging portion extending in the outer peripheral direction, and the shield is provided with an opening that can accommodate the elastic portion in the distal end direction and the proximal end direction, or a recess and a locking portion that opens in the inner peripheral direction. And is provided,
When the shield is positioned in the proximal direction, the elastic portion and the opening that can accommodate the elastic portion provided in the distal direction of the shield or the recess that opens in the inner circumferential direction are engaged. And
By rotating the shield in the axial direction or in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the distal direction.
When the shield is positioned in the front end direction, the elastic portion is engaged by extending in an opening capable of accommodating the elastic portion provided in the rear end direction of the shield or a recess opening in the inner circumferential direction. Combined
When the shield is axially rotated or moved in the axial direction, the elastic portion is contracted by being pressed against the inner surface of the shield, the engagement is released, and the shield is movable in the proximal direction.
Finally, the tip of the elastic part further extends from the position where the elastic part provided in the rear end direction of the shield is engaged by extending in the opening that can accommodate the elastic part or in the recess opening in the inner circumferential direction. The shield that enables the adapter and the outer cylinder to be separated by fixing the shield and the adapter by locking the engaging portion to the locking portion at a position moved in the direction. Syringe attached.

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