JP2009028336A - Syringe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a syringe capable of surely tilting a cannula relating to the syringe. <P>SOLUTION: By engaging an engaging means 8 provided in a plunger 4 with a means 7a to be engaged provided in an inner hub 7 and moving back the plunger, the cannula 2 can be housed inside a barrel together with the inner hub 7. The engaging means 8 is provided with a cylindrical member 8A provided on the distal end part of the plunger, an engaging part 8d which is provided on the cylindrical member and engaged with the means to be engaged of the inner hub, and pressurizing parts 8e and 8f which are abutted on the means engaged with the engaging part and pressurize the engaged means to be eccentric outwards in the radial direction from the center axis L of the cylindrical member and make the distal end part of the cannula eccentric outwards in the radial direction from the center axis of the barrel further. By this invention, since the engaged means abutted on the pressurizing parts can be surely pressurized to be eccentric outwards in the radial direction from the center axis of the cylindrical member by the pressurizing parts 8e and 8f, the cannula is surely tilted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a syringe, and more particularly to a syringe capable of storing a cannula in a barrel after use of the syringe.

2. Description of the Related Art Conventionally, as a syringe, in order to prevent an accidental puncture accident in which a used cannula is stuck in a medical staff, the cannula can be stored in a barrel together with an inner hub. (Patent Document 1)
That is, the syringe includes a cylindrical barrel, an inner hub held by a holding mechanism at the end of the barrel, a cannula provided on the inner hub, a plunger provided to the barrel so as to be movable forward and backward, and a plunger of the plunger. A gasket provided at the tip, an engagement means provided at the tip of the plunger, and an engaged means provided at the inner hub, and the engagement means and the engaged means when the plunger moves forward The inner hub is separated from the holding mechanism by retracting the plunger from this state, and the cannula is stored in the barrel together with the inner hub.
Also, in this type of syringe, when the cannula is stored in a barrel, the tip of the cannula is decentered radially outward from the central axis of the barrel. (Patent Document 2)
That is, in the syringe of Patent Document 2, the engaging means provided at the tip of the plunger is formed as two protrusions, while the engaged means provided at the inner hub is two engaging recesses that engage with each protrusion. It is formed as. Then, by making the curved surface of one of the two engaging recesses different from the curved surface of the other engaging recess, when each engaging recess engages with the projection, the cannula is removed from the difference in curved surface. It can be tilted.
JP-A-2005-65708 JP 2006-502793 A

In the syringe in which the tip of the cannula is decentered radially outward from the central axis of the barrel, the cannula is tilted because of the difference in the shape of the engaging part between the engaging means and the engaged means. In other words, since the cannula was tilted by a slight difference in shape at the contact portion, there was a drawback of lack of certainty.
In view of such circumstances, the present invention provides a syringe that can tilt the canula more reliably.

That is, the invention of claim 1 includes a cylindrical barrel, an inner hub held by a holding mechanism at the tip of the barrel, a cannula provided on the inner hub, a plunger provided on the barrel so as to be movable forward and backward, An engagement means provided at the tip of the plunger, and an engaged means provided in the inner hub,
When the plunger moves forward, the engaging means and the engaged means are engaged, and the plunger is retracted from this state, whereby the inner hub is detached from the holding mechanism, and the cannula is stored in the barrel together with the inner hub. In a syringe designed to do
The engaging means includes a cylindrical member provided at the distal end portion of the plunger, an engaging portion provided on the cylindrical member and engaged with the engaged means of the inner hub, and further on the engaging portion. Abutting the engaged means to be engaged and pressing and decentering the engaged means radially outward from the central axis of the cylindrical member, the tip of the cannula is radially outward from the central axis of the barrel. And a pressing portion that is eccentric.

According to the first aspect of the present invention, when the engaged means of the inner hub is engaged with the engaging portion of the engaging means, the pressing portion of the engaging means abuts on the engaged means and The engaging means is decentered radially outward from the central axis of the cylindrical member, and the tip of the cannula is decentered radially outward from the central axis of the barrel.
At this time, the pressing portion can surely decenter the engaged means abutting against the pressing portion radially outward from the central axis of the cylindrical member, whereby the tip of the cannula is It is possible to reliably decenter from the central axis radially outward.

Hereinafter, the present invention will be described with reference to the illustrated embodiment. FIG. 1 shows a cross-sectional view of a syringe 1 according to the present invention. The syringe 1 is used to prevent an accidental puncture accident caused by a medical staff. It becomes the syringe 1 (refer FIG. 3) which can be accommodated in. Hereinafter, the left side in the figure will be described as the front side or the tip side of the syringe 1.
The syringe 1 includes a cylindrical barrel 3 that stores blood, medicine, and the like, a plunger 4 that is moved forward and backward in the barrel 3, and a distal end side of the barrel 3 that is connected to the distal end of the plunger 4 in an airtight manner. And a gasket 5 that is moved forward and backward in a state of holding.
The barrel 3 includes a cylindrical portion 3a whose inside is a chemical chamber, a small-diameter cylindrical coupling portion 3b provided in front of the cylindrical portion 3a, and a contraction from the cylindrical portion 3a toward the coupling portion 3b. And a scale for measuring the amount of medicine and blood is printed on the outer peripheral surface of the cylindrical portion 3a.
Further, a barrel-side flange 3d for placing a finger of a medical worker on the rear end of the cylindrical portion 3a is formed to project outward in the radial direction of the cylindrical portion 3a. An annular bulging portion 3e protruding radially inward is formed on the inner peripheral surface of the end, and the bulging portion 3e can prevent the plunger 4 from being completely pulled out from the barrel 3. It is.

The plunger 4 includes four plate-like members 4 a (see FIG. 4) arranged along the axial direction of the barrel 3, and each plate-like member 4 a is spaced by 90 ° about the central axis of the barrel 3. Are arranged radially. A disc-shaped pressing portion 4b and a connecting portion 4c for connecting the gasket 5 are formed at a predetermined interval at the front ends of the four plate-like members 4a, and the rear end of the plate-like member 4a Is provided with a plunger side flange 4d.
The pressing portion 4b is manufactured to have substantially the same diameter as the inner diameter of the cylindrical portion 3a of the barrel 3, and the pressing portion 4b is formed in the cylindrical portion 3a when the plunger 4 is moved rearward. By engaging with the bulging portion 3e, the plunger 4 can be prevented from falling off the barrel 3 (see FIG. 3).
An annular recess 4e is formed between the disc-shaped pressing portion 4b and a disc-shaped connecting portion 4c formed on the tip side of the pressing portion 4b. The ends are connected. That is, the gasket 5 is formed in a cylindrical shape by a rubber material having elasticity, and the peripheral edge of the rear side opening is engaged with the annular recess 4e between the pressing portion 4b and the connecting portion 4c. The gasket 5 is integrally attached to the plunger 4.
Further, a notch-like weak portion 4f is formed at the same position near the tip of each plate-like member 4a, and the entire plunger 4 is bent with the weak portion 4f as a fulcrum, so that the weak portion 4f is located at the position of the weak portion 4f. It is possible to break the plate-like member 4a and separate the plunger 4 back and forth at the position of the fragile portion 4f (see FIG. 3).

An outer hub 6 as a holding mechanism made of resin is attached to the outer peripheral side of the cylindrical portion 3a of the barrel 3, and the resin inner hub 7 to which the canula 2 is integrally attached is detached from the outer hub 6. It is possible to engage. Then, by engaging the engaged means 7a provided at the rear end portion of the inner hub 7 and the engaging means 8 provided at the distal end portion of the plunger 4, the engaging means 8 is retracted. The inner hub 7 is separated from the outer hub 6 so that the inner hub 7 can be pulled into the barrel 3 together with the cannula 2.
As shown in an enlarged view in FIG. 5, the outer hub 6 is formed on the front side of the coupling portion 3b of the barrel 3 to hold the inner hub 7, and on the rear side of the holding portion 6a. And a connecting portion 6b that is integrally connected to the connecting portion 3b. The inner peripheral surface of the connecting portion 6b of the outer hub 6 and the outer peripheral surface of the connecting portion 3b of the barrel 3 are formed in the same tapered shape with the front end side narrowed, and the inside of the connecting portion 6b of the outer hub 6 When the coupling portion 3b is inserted into the outer hub 6, the outer hub 6 and the coupling portion 3b are brought into close contact with each other so that the outer hub 6 can be attached to the coupling portion 3b while maintaining liquid tightness.
On the other hand, the inner hub 7 includes a holding portion 7b that is formed in the front and integrally holds the cannula 2, and the engaged means 7a that is integrally connected to the rear end side of the holding portion 7b. ing.

The inner peripheral surface of the holding portion 6a of the outer hub 6 and the outer peripheral surface of the holding portion 7b of the inner hub 7 are tapered surfaces having the same shape with the front end side narrowed. It is designed to prevent leakage of chemicals.
An annular recess 6c constituting the first engaging means is formed on the rear inner peripheral surface of the holding portion 6a of the outer hub 6, and the annular recess 6c is formed on the rear outer peripheral surface of the holding portion 7b of the inner hub 7. And the annular convex part 7c which comprises a 1st engaging means is formed. By engaging the annular recess 6c and the annular projection 7c, the inner hub 7 is detached from the outer hub 6 even when a force is applied to the inner hub 7 by puncturing the patient with the cannula 2, for example. Can be prevented.
On the other hand, when the plunger 4 is moved rearward with the engaging means 8 provided on the plunger 4 and the engaged means 7a of the inner hub 7 engaged, the annular protrusion 7c and the annular recess The inner hub 7 can be pulled into the barrel 3 together with the cannula 2 by releasing the engagement with 6c.

The engaging means 8 includes a circular cylindrical member 8A provided at the distal end portion of the plunger 4, and this cylindrical member 8A is integrally connected to the distal end surface of the connecting portion 4c so as to be axial. It stretches forward.
The cylindrical member 8A passes through the front end of the gasket 5 and extends to the front, and the inner diameter of the through portion through which the cylindrical member 8A of the gasket 5 passes is smaller than the outer diameter of the cylindrical member 8A. It is. As a result, the inner peripheral portion of the penetration portion of the gasket 5 is brought into close contact with the outer periphery of the cylindrical member 8A by its own elasticity, and the portion is sealed, so that the cylindrical portion 8A keeps the gasket 5 liquid-tight. It slidably penetrates and extends forward.
FIG. 1 shows a state in which the outer peripheral portion of the front surface of the gasket 5 is moved to the forward end where it abuts lightly against the inner surface of the inclined portion 3c of the barrel 3 to perform “zero alignment”. The distal end portion of the member 8A does not come into contact with the engaged means 7a of the inner hub 7. On the other hand, in FIG. 2, the plunger 4 is further pushed in from the “zero point alignment” state to compress the gasket 5 in the axial direction, thereby further advancing the cylindrical member 8A to engage the engaged means 7a. Is pushed into the cylindrical member 8A relatively and the engaging means 8 is engaged with the engaged means 7a.

As shown in FIG. 5, in order to engage the engaged means 7a and the engaging means 8, an insertion hole 8a into which the engaged means 7a is inserted is formed at the tip of the cylindrical member 8A. The insertion hole 8a has a small diameter hole 8b on the front side and a large diameter hole 8c on the rear side. The stepped end surfaces of the small-diameter hole 8b and the large-diameter hole 8c are used as engaging portions 8d so that the engaged means 7a of the inner hub 7 can be locked therein (see FIG. 6). .
In the illustrated embodiment, the engaged means 7a of the inner hub 7 includes two thin plate portions 7d extending rearward from the rear end portion of the holding portion 7b. The thin plate portion 7d The rear end is integrally connected. And the outer shape of the rear end portion is formed in a triangular shape with a sharp rear end side and is easily inserted into the insertion hole 8a, and the tip end side of the triangular portion protrudes radially outward, respectively, The portion is a locking portion 7e that engages with the engaging portion 8d of the engaging means 8.
Therefore, when the engaged means 7a of the inner hub 7 is relatively inserted into the insertion hole 8a of the engaging means 8, the two locking portions 7e are separated by the small diameter hole 8b of the insertion hole 8a. The distance between the thin plate-like portions 7d is reduced and the compressed portion itself enters the small-diameter hole 8b while being compressed. Then, when the two locking portions 7e pass through the small diameter hole 8b and enter the large diameter hole 8c, the original state is restored by its own elasticity, and the interval between the two thin plate-like portions 7d is enlarged, Each locking portion 7e is engaged with the engaging portion 8d of the engaging means 8.

Further, as shown in FIGS. 6 and 7 in an enlarged manner, the engaging means 8 moves the cannula 2 into the barrel 3 when the inner hub 7 is detached from the outer hub 6 and the cannula 2 is pulled into the barrel 3. The first pressing portion 8e and the second pressing portion 8f are provided for inclining with respect to the axis. As shown in FIG. 3, if the cannula 2 can be tilted in the barrel 3, when the plunger 4 is advanced again, the tip of the cannula 2 is brought into contact with the inner surface of the tilted part 3 c of the barrel 3. It is possible to prevent the tip of 2 from protruding from the barrel 3 and causing an erroneous puncture accident.
The first pressing portion 8e is formed in the large-diameter hole 8c, and the first pressing portion 8e is in front of the central axis L of the cylindrical member 8A from one side in the radial direction toward the central axis L. It protrudes to the position. Therefore, the first pressing portion 8e abuts on the engaged means 7a when the engaged means 7a of the inner hub 7 enters the large-diameter hole 8c, and thus the engaged means 7a is brought into contact with the first pressing portion. 8e is guided so as to be eccentric in the protruding direction (arrow X direction in FIG. 6), whereby the tip of the cannula 2 can be inclined in the reverse direction.

In the present embodiment, the large-diameter hole 8c is formed in a shape in which the shape indicated by the mesh A in FIG. 6 extends in a direction perpendicular to (through the paper surface) the paper surface in FIG. That is, the large-diameter hole 8c is formed so as to penetrate the cylindrical member 8A in a direction orthogonal to the axial direction, and therefore the surface 8e ′ on the central axis side of the first pressing portion 8e is also formed with the paper surface of FIG. The surface is vertical (see FIG. 7).
In addition, in order to guide the engaged means 7a so as to be smoothly decentered in the protruding direction X of the first pressing portion 8e, it extends from the front surface in the axial direction of the first pressing portion 8e to the protruding surface 8e ′, that is, the engaged portion. A portion that contacts and guides the combining means 7a is formed in an arc shape.
By forming the large-diameter hole 8c in a direction perpendicular to the cylindrical member 8A as described above, the large-diameter hole 8c is formed when the engaging means 8 is manufactured integrally with the plunger 4 by a mold (not shown). A movable mold frame (not shown) for forming the diameter hole 8c can be pulled out in the penetrating direction.
Thus, if the movable mold can be pulled out in the penetrating direction, the shape of the stepped end faces of the small diameter portion 8c and the large diameter hole 8c, that is, the surface of the engaging portion 8d can be freely set. As shown in the figure, the surface of the engaging portion 8d is formed in a direction orthogonal to the axial direction of the cylindrical member 8A, or the radially outer surface of the engaging portion 8d is made to be more than the radially inner surface. By making the inclined surface slightly inclined forward, the engagement between the engaging portion 8d and the engaging portion 7e of the engaged means 7a can be made more reliable.

The second pressing portion 8f is formed in the small-diameter hole 8b with respect to the first pressing portion 8e, and is formed so as to protrude toward the central axis L from the side opposite to the first pressing portion 8e. .
Thereby, as described above, the first pressing portion 8e presses the engaged means 7a so as to be eccentric in the protruding direction of the first pressing portion 8e (the arrow X direction in FIG. 6), and at the same time, the second pressing portion. By 8f, it is possible to press the part ahead of the contact part of the engaged means 7a with the first pressing part 8e so as to be eccentric in the direction opposite to the protruding direction of the first pressing part 8e. The canula 2 can be inclined more satisfactorily.
Further, unlike the large diameter hole 8c, the small diameter hole 8b is formed as a hole having a circular cross section along the axial direction from the tip of the cylindrical member 8A, and the second pressing portion 8f is shown in FIG. Thus, it forms so that it may protrude in a semicircle shape on the opposite side to the formation position of the 1st press part 8e. Such a small diameter hole 8b and the second pressing portion 8f can be formed by pulling out a movable mold frame (not shown) for forming the small diameter hole 8b in the axial direction of the cylindrical member 8A.

A method of using the syringe 1 having the above configuration will be described.
First, when a drug is sucked into the syringe 1 or blood is collected, the medical staff first advances the plunger 4 and positions the gasket 5 at the forward end to perform “zero adjustment”. At this time, as described above, the outer peripheral portion of the front surface of the gasket 5 comes into light contact with the inner surface of the inclined portion 3c of the barrel 3, but in this state, the distal end portion of the cylindrical member 8A is engaged with the inner hub 7. There is no contact with the means 7a.
When this “zero adjustment” is performed, the cannula 2 is punctured into a vial or a patient, and then the plunger 4 is retracted to allow the drug solution or blood to flow into the barrel 3, and then the plunger 4 is advanced again. If it does so, the chemical | medical solution and blood in the barrel 3 can be discharge | released from the cannula 2. FIG.
When the cannula 2 is punctured into a patient or the like, a force acts backward on the cannula 2 and the inner hub 7, but the annular convex part 7 c of the inner hub 7 and the annular concave part 6 c of the outer hub 6 are engaged. Thus, the inner hub 7 does not move away from the outer hub 6 and move backward.

When the use of the syringe 1 is completed, the cannula 2 is accommodated in the barrel 3 as follows in order to prevent an accident that the cannula 2 is accidentally punctured by a medical staff.
First, the plunger 4 is advanced so that the outer peripheral portion of the front surface of the gasket 5 is lightly brought into contact with the inner surface of the inclined portion 3 c of the barrel 3. This state is the same as the “zero point alignment” state described above. When this state is reached, the plunger 4 is continuously strongly advanced to compress the gasket 5 in the axial direction, whereby the cylindrical member 8A is further advanced together with the plunger 4, and the engaged means 7a is moved to the cylindrical member 8A. It is relatively inserted into the insertion hole 8a.
The engaged means 7a inserted into the insertion hole 8a passes through the small diameter hole 8b and is inserted into the large diameter hole 8c, and the end of the engaged means 7a is the first inside the large diameter hole 8c. It comes into contact with the pressing portion 8e and is pushed up in the direction of arrow X in FIG. When the end portion of the engaged means 7a is further inserted while being pushed up in the direction of the arrow X in FIG. 6, the front portion is pressed against the second pressing portion 8f from the end portion. 8e and 8f act on the inner hub 6 with a rotational moment that urges the holding portion 7b on the front side downward in FIG.
When the engaged means 7a is further inserted into the insertion hole 8a, the locking portion 7e of the engaged means 7a goes over the engaging portion 8d and engages with it.

Next, in this state, if the plunger 4 is retracted, the coupling force between the engaged means 7a and the engaging means 8 is greater than the annular convex part 7c of the inner hub 7 and the annular concave part 6c of the outer hub 6. Therefore, the inner hub 7 is detached from the outer hub 6 and pulled together with the cannula 2 into the barrel 3.
When the inner hub 7 is detached from the outer hub 6, the tip end portion of the cannula 2 is decentered downward by the rotational moment generated by the pressing portions 8e and 8f, and as shown in FIG. It comes to contact | abut to the inner surface of. For this reason, even if the plunger 4 is advanced again thereafter, the cannula 2 is prevented from advancing by the inclined portion 3c of the barrel 3, so that it is effectively prevented from projecting out from the inside of the barrel 3, thereby being engaged in medical care. It is possible to prevent an accident in which a cannula is accidentally punctured by a person.
Furthermore, when the plunger 4 is retracted and the fragile portion 4f is exposed to the outside of the barrel 3, the medical worker bends the plunger 4 with the fragile portion 4f as a fulcrum, and separates the plunger 4 into two at that position. . This makes it difficult to push the plunger 4 deeply into the barrel 3, so that the canula 2 can be prevented from projecting from the barrel 3 to the outside also in this respect.

In the above embodiment, the cylindrical member 8A is integrally provided at the distal end portion of the plunger 4, and the gasket 5 is slidably penetrated, thereby enabling “zero alignment”. However, it is not limited to this. When the present invention is applied to a syringe that does not require “zero-point alignment”, the gasket 5 itself may be provided with the cylindrical member 8A, that is, the engaging means 8, although not shown.
Further, the holding mechanism for holding the inner hub 7 at the tip of the barrel 3 is not limited to the above-described embodiment, and any configuration can be used as long as the inner hub 7 can be detachably held at the tip of the barrel 3. It may be.
Furthermore, as the engaging means 8 and the engaged means 7a, various configurations can be adopted as long as the above object can be achieved.

Sectional drawing of the state which shows the syringe 1 which concerns on this invention, and is performing "zero point alignment". FIG. 2 is a cross-sectional view showing a state where the plunger 4 is further advanced from the state of FIG. 1 and the engaging means 8 of the plunger 4 and the engaged means 7a of the inner hub 7 are engaged. FIG. 3 is a cross-sectional view showing a state where the plunger 4 is retracted from the state of FIG. 2 and the inner hub 7 and the cannula 2 are pulled into the barrel 3. Sectional drawing which follows the IV-IV line of FIG. Sectional drawing which expands and shows the principal part of FIG. Sectional drawing which expands and shows the principal part of FIG. The left view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe 2 Canula 3 Barrel 3a Tubular part 3b Coupling part 3c Inclination part 4 Plunger 5 Gasket 6 Outer hub (holding mechanism) 7 Inner hub 7a Engagement means 7e Locking part 8 Engagement means 8A Cylindrical member 8a Insertion hole 8b Small-diameter hole 8c Large-diameter hole 8d Engagement portion 8e First pressing portion 8e 'Surface of first pressing portion 8f Second pressing portion

Claims (8)

A cylindrical barrel, an inner hub held by a holding mechanism at the tip of the barrel, a cannula provided in the inner hub, a plunger provided to be movable forward and backward in the barrel, and provided at a tip of the plunger An engagement means, and an engaged means provided on the inner hub,
When the plunger moves forward, the engaging means and the engaged means are engaged, and the plunger is retracted from this state, whereby the inner hub is detached from the holding mechanism, and the cannula is stored in the barrel together with the inner hub. In a syringe designed to do
The engaging means includes a cylindrical member provided at the distal end portion of the plunger, an engaging portion provided on the cylindrical member and engaged with the engaged means of the inner hub, and further on the engaging portion. Abutting the engaged means to be engaged and pressing and decentering the engaged means radially outward from the central axis of the cylindrical member, the tip of the cannula is radially outward from the central axis of the barrel. A syringe characterized by comprising a pressing portion that is eccentric.   The cylindrical member includes an insertion hole into which the engagement means of the inner hub is inserted. The insertion hole includes a front-side small-diameter hole, a rear-side large-diameter hole, a small-diameter hole, and a large-diameter. The engagement portion formed by a step portion with a hole is provided, and the engaged means of the inner hub is locked to the engagement portion. The syringe described.   The pressing portion is provided in the large-diameter hole and presses the engaged means radially outward from the central axis of the cylindrical member. The pressing portion is provided in the small-diameter hole and the The syringe according to claim 2, further comprising: a second pressing portion that presses the engaging means radially outward from the central axis of the cylindrical member, on the opposite side to the first pressing portion.   The said large diameter hole is formed so that it may penetrate the said cylindrical member in the direction orthogonal to the axial direction, The surface of the 1st press part is formed in parallel with the penetration direction, It is characterized by the above-mentioned. The syringe according to claim 2 or claim 3.   5. The small diameter hole is formed as a hole having a circular cross section in the axial direction from the distal end surface of the cylindrical member, and the second pressing portion is formed to project in a semicircular shape. The syringe according to any one of the above.   The inner hub includes a holding portion held by the holding mechanism and the engaged means connected to the rear of the holding portion, and the engaged means is provided from a rear end portion of the holding portion. Two thin plate-like portions extending rearward with a space between each other, and a triangular cross-sectional portion having a pointed rear end side integrally connecting the rear end portions of the thin plate-like portions, and the front end side of the triangular portion being 6. The projection according to any one of claims 1 to 5, wherein each projecting outward in a radial direction is a locking portion that engages with an engaging portion of the engaging means. Syringe.   The cylindrical member is integrally provided at the distal end portion of the plunger, extends slidably through the gasket provided at the distal end portion of the plunger while maintaining liquid tightness, In the state of “zero point alignment” moved to the forward end, the engaging means does not engage with the engaged means of the inner hub, and the plunger is further pushed in from the state of “zero point alignment” to move the gasket. The syringe according to any one of claims 1 to 6, wherein the engaging means and the engaged means are engaged when the cylindrical member is advanced while being compressed in the axial direction. .   The syringe according to any one of claims 1 to 6, wherein the cylindrical member is provided on a gasket provided at a distal end portion of the plunger.

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