WO2014203365A1

WO2014203365A1 - Suction syringe

Info

Publication number: WO2014203365A1
Application number: PCT/JP2013/066922
Authority: WO
Inventors: 一美後藤; 保片柳
Original assignee: テルモ・クリニカルサプライ株式会社; 株式会社プラスチック・ホンダ
Priority date: 2013-06-20
Filing date: 2013-06-20
Publication date: 2014-12-24

Abstract

A suction syringe (1) is configured in such a manner that a pusher (12) comprises a front end section (20) on which a gasket is mounted and a shaft section (22) which fits to the front end section (20) and in such a manner that, when the pusher (12) is moved in the direction of pulling the pusher (12) out of a syringe cylinder (10) and the shaft section (22) is positioned outside the syringe cylinder (10), the shaft section (22) moves toward the outside of the syringe cylinder (10) in the radial direction thereof and engages with the base end section (10a) of the syringe cylinder (10), thereby restricting the return of the pusher (12) when a negative pressure is created.

Description

Syringe for suction

The present invention relates to a suction syringe having a syringe barrel having a suction port and a pusher provided with a gasket slidable in the syringe barrel at the tip.

As a treatment method for removing a foreign substance such as a thrombus clogged in a blood vessel, a method using a suction catheter in which a suction lumen is formed in a long shaft is performed. This suction catheter sucks and removes foreign matter from the suction port at the distal end to the suction lumen. As a source of negative pressure for sucking foreign matter, this suction catheter is connected to the hub at the proximal end. A syringe is used.

This suction syringe can generate a negative pressure in the syringe barrel by moving the pusher in the direction of pulling it out of the syringe barrel. At this time, when removing a foreign substance such as a thrombus clogged in a blood vessel using the suction catheter as described above, the foreign substance such as a thrombus is removed outside the body by being sucked into the syringe through the suction catheter. Therefore, in order to hold the sucked foreign matter in the syringe barrel, it is necessary to regulate the movement of the pusher so that the pusher does not return to the syringe barrel in a state where a negative pressure is generated in the syringe barrel.

Here, as a conventional technique for restricting the movement of the pusher, Patent Document 1 discloses a container in which a locking piece is rotatably mounted on an eccentric shaft formed on a plunger rod, and a medicine and a solution are filled therein. A technique is disclosed in which the plunger rod is locked so as not to move by setting the outer peripheral edge of the locking piece to the outside of the inner diameter of the main body and locking the locking piece to the container main body.

JP 2005-006675 A

However, the technique of Patent Document 1 is a technique of a prefilled syringe in which a container body is prefilled with a medicine and a solution, and is not a technique related to a suction syringe that generates a negative pressure in a syringe barrel.

In addition, the prefilled syringe of Patent Document 1 has a complicated structure because the pusher is composed of three components, that is, a gasket, a locking piece, and a plunger rod. Therefore, when handling the prefilled syringe of Patent Document 1 having a complicated structure as described above, the handler rotates the locking piece while holding both the container main body and the plunger rod to lock and unlock the plunger rod. An operation must be performed. As described above, the prefilled syringe of Patent Document 1 is not good in operability because the work of the handler becomes complicated. In particular, when performing treatment to remove foreign substances such as blood clots clogged in the blood vessel as described above, the handling of the operator may be troublesome because the treatment may be hindered. It is desirable that it can be engaged (locked).

Therefore, the present invention has been made to solve the above-described problems, and the return of the pusher is easily regulated under a state where a negative pressure is generated in the syringe barrel with a simple structure. An object of the present invention is to provide a syringe for suction that can be used.

One aspect of the present invention made to solve the above problems is a syringe for suction, which is a bottomed cylinder having an open base end, and is movable to the syringe barrel connected to the suction catheter And a pusher that generates a negative pressure in the syringe barrel by being moved in a direction of pulling out from the syringe barrel, and the pusher has a tip portion to which a gasket is attached, and the tip portion A shaft portion that fits into the syringe barrel, and when the shaft portion is positioned outside the syringe barrel by moving the pusher in a direction of pulling out from the syringe barrel, the shaft portion is outside the diameter of the syringe barrel. The return of the pusher when negative pressure is generated is regulated by moving in the direction and engaging with the base end.

According to this aspect, the pusher has a simple structure including a tip portion and a shaft portion. The suction syringe can easily regulate the return of the pusher when negative pressure is generated by moving the shaft portion outwardly of the syringe barrel and engaging with the proximal end portion. In this manner, the suction syringe can easily regulate the return of the pusher under a state where a negative pressure is generated in the syringe barrel with a simple structure.

In the above aspect, the distal end portion and the shaft portion are fitted by a groove formed in the distal end portion and a protrusion formed in the shaft portion and slidably fitted into the groove. Are preferred.

According to this aspect, by sliding the protrusion in the groove, the shaft portion can move in the radially outward direction of the syringe barrel while being guided by the groove. Therefore, the operability of the suction syringe is improved.

In the above aspect, the fitting portion of the groove with the protrusion is formed so as to be inclined with respect to the radial direction of the pusher in the direction of pulling out the pusher from the syringe barrel. It is preferable.

According to this aspect, the shaft portion can be naturally moved in the radially outward direction of the syringe barrel simply by moving the pusher in the direction of pulling out the syringe barrel. Therefore, the operability of the suction syringe is significantly improved.

In the above aspect, it is preferable that the fitting portion of the groove with the protrusion is formed along the radial direction of the syringe barrel.

According to this aspect, the pusher can easily move in the radially outward direction of the syringe barrel. Therefore, the operability of the suction syringe is significantly improved.

Further, in the above aspect, the protrusion is formed at a position that is eccentric to a side opposite to a side where the shaft portion moves in a radially outward direction of the syringe barrel with respect to a main body portion of the shaft portion. It is preferable.

According to this aspect, when the shaft portion moves in the radially outward direction of the syringe barrel and engages with the base end portion, the area of the engaging portion with the base end portion in the shaft portion can be increased. Therefore, the engagement state between the shaft portion and the base end portion is stabilized. Therefore, the suction syringe can reliably regulate the return of the pusher under a state in which a negative pressure is generated in the syringe barrel.

According to the suction syringe of the present invention, the return of the pusher can be easily regulated under a simple structure under a state in which a negative pressure is generated in the syringe barrel.

It is an external appearance perspective view of the syringe for suction of Example 1, and is a figure showing the state where the pusher was arranged in the syringe barrel. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG. FIG. 3 is a cross-sectional view taken along the line CC of FIG. It is an external appearance perspective view of the syringe for suction of Example 1, and is a figure which shows the state which the axial part of the pusher is engaging with the base end part of the injection cylinder. FIG. 6 is a DD sectional view of FIG. 5. FIG. 7 is a cross-sectional view taken along line EE in FIG. 6. It is an external appearance perspective view of the suction syringe of Example 2, and is a figure which shows the state by which the pusher was arrange | positioned in the syringe barrel. FIG. 9 is a sectional view taken along line FF in FIG. 8. FIG. 10 is a sectional view taken along line GG in FIG. 9. FIG. 10 is a cross-sectional view taken along line HH in FIG. 9. It is an external appearance perspective view of the syringe for suction of Example 2, and is a figure which shows the state which the axial part of the pusher is engaging with the base end part of the injection cylinder. It is II sectional drawing of FIG. It is JJ sectional drawing of FIG.

Hereinafter, embodiments of the suction syringe of the present invention will be described in detail with reference to the drawings.

<Example 1>
[Configuration of suction syringe]
First, the configuration of the suction syringe 1 of Example 1 will be described. Here, FIG. 1 is an external perspective view of the suction syringe 1 according to the first embodiment, in which no negative pressure is generated in the syringe barrel 10, and the pusher 12 is disposed in the syringe barrel 10. It is a figure which shows the state made. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line CC in FIG. FIG. 5 is an external perspective view of the suction syringe 1 according to the first embodiment, in which a negative pressure is generated in the syringe barrel 10, and the shaft portion 22 of the pusher 12 is the syringe barrel 10. It is a figure which shows the state engaged with the base end part 10a. FIG. 6 is a sectional view taken along the line DD of FIG. Further, FIG. 7 is a cross-sectional view taken along the line EE of FIG.

As shown in FIGS. 1 to 7, the suction syringe 1 has a syringe barrel 10 and a pusher 12.

The injection tube 10 is formed in a bottomed tube shape having an open base end portion 10a. Further, the syringe barrel 10 is integrally formed at the tip portion thereof, that is, at the center portion of the bottom portion on the tip side, so that a mouth portion 10b having a small diameter with respect to the barrel portion of the syringe barrel 10 protrudes from the bottom portion. ing. A suction catheter (not shown) is connected to the mouth portion 10b.

Further, the syringe barrel 10 is integrally formed with a flange-shaped finger rest 10c on the outer periphery of the base end 10a. The finger rests 10c are a pair of plate-like portions formed so as to protrude in opposite directions with respect to the central axis of the syringe barrel 10. The finger pad 10c is formed in a longitudinal shape having a longitudinal direction in one direction orthogonal to the central axis of the syringe barrel 10.

The syringe barrel 10 may be provided with a scale (not shown) indicating the amount of liquid on the outer peripheral surface 10e.

The pusher 12 includes a tip portion 20 and a shaft portion 22. The distal end portion 20 is disposed closer to the mouth portion 10 b (bottom portion) of the syringe barrel 10 than the shaft portion 22. The distal end portion 20 includes a first portion 20a, a second portion 20b, and a third portion 20c in order from the mouth portion 10b side of the syringe barrel 10. And the front-end | tip part 20 is mounted | worn with the gasket 14 at the opening | mouth part 10b side of the injection cylinder 10 in the 1st site | part 20a. Further, the second portion 20 b has a substantially cross-shaped cross section in the radial direction orthogonal to the axial direction of the pusher 12.

Further, the third portion 20c is formed in a substantially cylindrical shape, and a groove 30 is formed therein. The groove 30 is open on one end side in the radial direction of the pusher 12 and is closed on the other end side in the radial direction of the pusher 12 inside the inner peripheral surface 10 d of the syringe barrel 10.

As shown in FIG. 2, in the axial section of the pusher 12, the fitting portion 30 a with the protrusion 32 of the shaft portion 22 in the groove 30 is formed to be inclined with respect to the radial direction of the pusher 12. Has been. Specifically, in the axial cross section of the pusher 12, the fitting portion 30 a moves from the closed side to the open side of the groove 30, that is, the shaft portion 22 moves outward in the radial direction of the syringe barrel 10. When moving the shaft portion 22 in the direction of movement, the direction side in which the pusher 12 is pulled out of the syringe barrel 10 with respect to the radial direction of the pusher 12 (vertical direction in FIG. 2) (right side in FIG. 2). ). It should be noted that the inclination angle θ (see FIGS. 2 and 6) of the fitting portion 30a with respect to the radial direction of the pusher 12 is considered to be 5 ° to 50 °, and particularly preferably 10 ° to 30 °. . In FIG. 2 and FIG. 6, as an example, the inclination angle θ is shown as 10 °.

The shaft portion 22 is fitted to the tip portion 20. And the main-body part 22a of the axial part 22 has comprised the cross section of the radial direction orthogonal to the axial direction (left-right direction of FIG. 2) in substantially cross shape. Further, the shaft portion 22 includes a convex portion 22c that protrudes toward the distal end portion 20 on the end surface 22b of the main body portion 22a on the distal end portion 20 side.

And the shaft part 22 is provided with a projection 32 projecting in the radial direction of the shaft part 22 (perpendicular to the plane of FIG. 2 and up and down in FIG. 4) on the projection 22c. The protrusion 32 is formed in a substantially rectangular parallelepiped shape, and is fitted to the groove 30 in a slidable state.

Further, as shown in FIG. 2, in the axial section of the pusher 12, the position of the central axis Lt of the convex portion 22 c and the protrusion 32 is deviated from the position of the central axis Lj of the main body portion 22 a of the shaft portion 22. . That is, the convex portion 22 c and the protrusion 32 are eccentric with respect to the main body portion 22 a of the shaft portion 22 on the side opposite to the side where the shaft portion 22 moves outward in the radial direction of the syringe barrel 10. In FIG. 2, the position of the central axis Lj coincides with the position of the central axis Ls of the distal end portion 20 and the position of the central axis of the syringe barrel 10.

In addition, the shaft portion 22 includes an engaging portion 34 that abuts on the proximal end portion 10a of the syringe barrel 10 when negative pressure is generated in the syringe barrel 10 at the end surface 22b, as will be described later. Yes.

Further, the shaft portion 22 is provided with a flange 36 at the end opposite to the tip 20 side. The flange 36 is a portion that the operator grips with a finger when the handler of the suction syringe 1 moves the pusher 12 in the direction in which the pusher 12 is pulled out from the syringe barrel 10.

Such a pusher 12 is movably inserted inside the inner peripheral surface 10d of the syringe barrel 10 and moves in a direction in which it is pulled out of the syringe barrel 10, thereby generating a negative pressure in the syringe barrel 10. it can. Here, “generating negative pressure in the syringe barrel 10” means that the pressure inside the syringe barrel 10 is made lower than the pressure outside the syringe barrel 10. The suction syringe 1 has a structure in which the pusher 12 is not completely removed from the syringe barrel 10.

[Operation of suction syringe]
Next, the operation of the suction syringe 1 having such a configuration will be described. First, as shown in FIGS. 1, 2, and 4, the suction syringe 1 has an inner peripheral surface of the syringe barrel 10 before use, that is, before negative pressure is generated in the syringe barrel 10. It is stored in a state of being pushed inside 10d. At this time, as shown in FIG. 2, the shaft portion 22 of the pusher 12 is formed so that the position of the central axis Lj of the main body portion 22a coincides with the position of the central axis Ls of the distal end portion 20. Arranged inside the inner peripheral surface 10d. The position of the central axis Ls of the distal end portion 20 matches the position of the central axis of the syringe barrel 10.

Therefore, when the operator of the suction syringe 1 moves the pusher 12 in the direction of pulling out the syringe barrel 10, a negative pressure is generated in the syringe barrel 10. When the handler further moves the pusher 12 in the direction of pulling out the syringe barrel 10, the negative pressure generated in the syringe barrel 10 increases.

Eventually, as shown in FIGS. 5 and 6, when the main body portion 22 a of the shaft portion 22 is positioned outside the syringe barrel 10, the shaft portion 22 is released from the syringe barrel 10. Then, as shown in FIGS. 6 and 7, the protrusion 32 of the shaft portion 22 slides on the fitting portion 30 a of the groove 30 of the tip portion 20. In this way, as shown in FIGS. 5 and 6, the shaft portion 22 moves toward the outside in the radial direction of the syringe barrel 10. Then, the position of the central axis Lj of the main body portion 22a of the shaft portion 22 is naturally deviated from the position of the central axis Ls of the distal end portion 20. That is, the shaft portion 22 naturally moves to a position eccentric with respect to the distal end portion 20 and the syringe barrel 10.

Then, as shown in FIGS. 5 and 6, the engaging portion 34 of the shaft portion 22 contacts and engages with the proximal end portion 10 a of the syringe barrel 10. As a result, the pusher 12 is restricted from returning in the direction opposite to the direction in which the pusher 12 is pulled out from the syringe barrel 10. Further, at this time, as shown in FIG. 6, the projection 32 (convex portion 22 c) of the shaft portion 22 contacts the inner peripheral surface 10 d of the syringe barrel 10. As a result, the shaft portion 22 is further restricted from moving outward in the radial direction of the pusher 12.

As described above, in the syringe 1 for suction, the pusher 12 is locked (locked) under a state where a negative pressure is generated in the syringe barrel 10 as shown in FIGS. . Therefore, the operator can easily restrict the return of the pusher 12 under a state where a negative pressure is generated in the syringe barrel 10.

Thus, in the suction syringe 1 according to the first embodiment, the stopper 22 is used to restrict the shaft portion 22 of the pusher 12 from returning in the direction opposite to the direction in which the pusher 12 is pulled out of the syringe barrel 10. As a stopping means).

Thereafter, when the handler releases the generation of the negative pressure in the syringe barrel 10, the engaging portion 34 of the shaft portion 22 is engaged with the base end portion 10 a as shown in FIGS. 5 and 6. From the state, the shaft portion 22 is moved inward in the radial direction of the syringe barrel 10. Then, the protrusion 32 of the shaft portion 22 moves toward the inside in the radial direction of the syringe barrel 10 while sliding the fitting portion 30a of the groove 30 of the distal end portion 20. Thereby, the engaging part 34 of the shaft part 22 is separated from the base end part 10a, and the engagement with the base end part 10a is released. And the axial part 22 moves to the direction pushed inside 10d of the internal peripheral surface of the injection cylinder 10. As shown in FIG. As a result, the suction syringe 1 enters the state shown in FIGS. 1 to 4, and the generation of the negative pressure in the syringe barrel 10 is released.

[Effect of this embodiment]
According to the present embodiment, the suction syringe 1 has a bottomed cylindrical shape with an open proximal end portion 10a, and is inserted into the syringe barrel 10 connected to the suction catheter and the syringe barrel 10 so as to be movable. And a pusher 12 that generates a negative pressure in the syringe barrel 10 by being moved in a direction in which the syringe 10 is pulled out. The pusher 12 includes a distal end portion 20 to which the gasket 14 is attached, and a shaft portion 22 that is fitted to the distal end portion 20. When the suction syringe 1 moves the pusher 12 in the direction in which the pusher 12 is pulled out of the syringe barrel 10 and positions the shaft portion 22 outside the syringe barrel 10, the shaft portion 22 is placed on the outer side in the radial direction of the syringe barrel 10. By moving and engaging with the base end portion 10a, the return of the pusher 12 when negative pressure is generated is regulated.

Thus, the pusher 12 has a simple structure including the tip portion 20 and the shaft portion 22. The suction syringe 1 moves the shaft portion 22 to the outside in the radial direction of the syringe barrel 10 and engages the engaging portion 34 with the proximal end portion 10a, thereby returning the pusher 12 when negative pressure is generated. Can be easily regulated. In this manner, the suction syringe 1 can easily regulate the return of the pusher 12 under a simple structure under a state in which a negative pressure is generated in the syringe barrel 10.

Further, the distal end portion 20 and the shaft portion 22 are fitted by a groove 30 formed in the distal end portion 20 and a protrusion 32 that is formed in the shaft portion 22 and slidably fits into the groove 30. . Then, by sliding the protrusion 32 into the groove 30, the shaft portion 22 can be moved outward in the radial direction of the syringe barrel 10 while being guided by the groove 30. Therefore, the operability of the suction syringe 1 is improved.

In addition, the fitting portion 30 a of the groove 30 with the protrusion 32 is formed so as to be inclined with respect to the radial direction of the pusher 12 in the direction in which the pusher 12 is pulled out from the syringe barrel 10. Specifically, as shown in FIGS. 2 and 6, in the cross section in the axial direction of the pusher 12, the fitting portion 30 a moves from the closed side to the open side of the groove 30, that is, the shaft portion 22. When moving the outer side of the syringe barrel 10 in the radial direction, the pusher 12 is moved relative to the radial direction of the pusher 12 (vertical direction in FIGS. 2 and 6) as it moves in the direction in which the shaft portion 22 is moved. It is formed so that it may incline to the direction side (right side of FIG. 2 and FIG. 6) which pulls out from the injection cylinder 10. As shown in FIG. Thereby, the shaft part 22 can be naturally moved to the outer side in the radial direction of the syringe barrel simply by moving the pusher 12 in the direction of pulling out the syringe barrel 10. Therefore, the operability of the suction syringe 1 is significantly improved.

Also, the protrusion 32 is formed at a position that is eccentric with respect to the main body portion 22a of the shaft portion 22 on the side opposite to the side on which the shaft portion 22 moves outward in the radial direction of the syringe barrel 10. Thereby, when the axial part 22 moves to the outer side of the radial direction of the injection cylinder 10, and engages with the base end part 10a, the engagement area of the engaging part 34 of the axial part 22 can be enlarged. Therefore, the engagement state between the shaft portion 22 and the base end portion 10a is stabilized. Therefore, the suction syringe 1 can reliably regulate the return of the pusher 12 under a state where a negative pressure is generated in the syringe barrel 10.

<Example 2>
Next, the second embodiment will be described. The same components as those of the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and different points will be mainly described. Here, FIG. 8 is an external perspective view of the suction syringe 2 of Example 2, in which no negative pressure is generated in the syringe barrel 10, and the pusher 12 is disposed in the syringe barrel 10. It is a figure which shows the state made. FIG. 9 is a cross-sectional view taken along the line FF in FIG. 10 is a GG cross-sectional view of FIG. 9, and FIG. 11 is a HH cross-sectional view of FIG. FIG. 12 is an external perspective view of the suction syringe 2 according to the second embodiment, in which a negative pressure is generated in the syringe barrel 10, and the shaft portion 22 of the pusher 12 is connected to the syringe barrel 10. It is a figure which shows the state engaged with the base end part 10a. FIG. 13 is a cross-sectional view taken along the line II of FIG. Further, FIG. 14 is a sectional view taken along line JJ of FIG.

[Configuration of suction syringe]
As shown in FIGS. 8 and 9, the pusher 12 in the suction syringe 2 of the second embodiment is different from the first embodiment. As shown in FIGS. 8 and 9, the distal end portion 20 has a groove 40 in the third portion 20 c. I have. In the groove 40, one end side in the radial direction of the pusher 12 is opened inside the inner peripheral surface 10 d of the syringe barrel 10, and the other end side in the radial direction of the pusher 12 is closed. 9 and 13, in the axial section of the pusher 12, the fitting portion 40a with the protrusion 42 in the groove 40 is in the radial direction of the pusher 12 (the vertical direction in FIGS. 9 and 13). ) In parallel, that is, perpendicular to the axial direction of the pusher 12.

Further, the shaft portion 22 is provided with a projection 42 protruding in the radial direction of the shaft portion 22 on the convex portion 22d. The protrusion 42 is formed in a disk shape and engages with the groove 40 in a slidable state. Further, as shown in FIG. 9, in the axial section of the pusher 12, the position of the central axis Lt of the convex portion 22 d and the protrusion 42 is deviated from the position of the central axis Lj of the main body portion 22 a of the shaft portion 22. . That is, the convex portion 22 d and the protrusion 42 are eccentric with respect to the main body portion 22 a of the shaft portion 22 on the side opposite to the side where the shaft portion 22 moves outward in the radial direction of the syringe barrel 10.

In this embodiment, two grooves 40 and two protrusions 42 are formed.

[Operation of suction syringe]
Next, the operation of the suction syringe 2 having such a configuration will be described. First, as shown in FIGS. 8, 9, and 11, the suction syringe 2 has an inner peripheral surface of the syringe barrel 10 before use, that is, before negative pressure is generated in the syringe barrel 10. It is stored in a state of being pushed inside 10d.

Therefore, when the operator of the suction syringe 2 moves the pusher 12 in the direction of pulling out the syringe barrel 10, a negative pressure is generated in the syringe barrel 10. Eventually, as shown in FIGS. 12 and 13, when the main body portion 22 a of the shaft portion 22 is positioned outside the syringe barrel 10, the shaft portion 22 is released from the syringe barrel 10. Therefore, the handler rotates the shaft portion 22 around the central axis Lj. Then, as shown in FIG. 13 and FIG. 14, the shaft portion 22 moves toward the outside in the radial direction of the syringe barrel 10 by sliding the groove 40 while the projection 42 of the shaft portion 22 rotates. In this way, the position of the central axis Lj of the main body portion 22a of the shaft portion 22 deviates from the position of the central axis Ls of the distal end portion 20. That is, the shaft portion 22 moves to a position eccentric with respect to the distal end portion 20 and the syringe barrel 10.

Then, as shown in FIGS. 12 and 13, the engaging portion 34 of the shaft portion 22 comes into contact with and engages with the proximal end portion 10 a of the syringe barrel 10. As a result, the pusher 12 is restricted from returning in the direction opposite to the direction in which the pusher 12 is pulled out from the syringe barrel 10. Further, at this time, as shown in FIG. 13, the protrusion 42 (projection 22 d) of the shaft portion 22 comes into contact with the inner peripheral surface 10 d of the syringe barrel 10. As a result, the shaft portion 22 is further restricted from moving outward in the radial direction of the pusher 12.

As described above, in the suction syringe 2, the pusher 12 is locked under a state where a negative pressure is generated in the syringe barrel 10 as shown in FIGS. 12 to 14. Therefore, the operator can easily restrict the return of the pusher 12 under a state where a negative pressure is generated in the syringe barrel 10.

Thereafter, when the handler releases the generation of the negative pressure in the syringe barrel 10, as shown in FIGS. 12 and 13, the engaging portion 34 of the shaft portion 22 is engaged with the proximal end portion 10a. In the state, the shaft 22 is moved inward in the radial direction of the syringe barrel 10 while rotating. Then, the protrusion 42 of the shaft portion 22 slides along the groove 40 of the distal end portion 20 and moves toward the inside in the radial direction of the syringe barrel 10. Thereby, the engaging part 34 of the shaft part 22 is separated from the base end part 10a, and the engagement with the base end part 10a is released. And the axial part 22 moves to the direction pushed inside 10d of the internal peripheral surface of the injection cylinder 10. As shown in FIG. As a result, the suction syringe 2 enters the state shown in FIGS. 8 to 11, and the generation of the negative pressure in the syringe barrel 10 is released.

[Effect of this embodiment]
According to the present embodiment, the suction syringe 2 has a bottomed cylindrical shape with an open proximal end portion 10a, and is inserted into the syringe barrel 10 connected to the suction catheter and the syringe barrel 10 so as to be movable. And a pusher 12 that generates a negative pressure in the syringe barrel 10 by being moved in a direction in which the syringe 10 is pulled out. The pusher 12 includes a distal end portion 20 to which the gasket 14 is attached, and a shaft portion 22 that is fitted to the distal end portion 20. When the suction syringe 2 moves the pusher 12 in the direction in which the pusher 12 is pulled out from the syringe barrel 10 and positions the shaft portion 22 outside the syringe barrel 10, the shaft portion 22 is placed on the outer side in the radial direction of the syringe barrel 10. By moving and engaging with the base end portion 10a, the return of the pusher 12 when negative pressure is generated is regulated.

Thus, the pusher 12 has a simple structure including the tip portion 20 and the shaft portion 22. The suction syringe 2 moves the shaft portion 22 to the outside in the radial direction of the syringe barrel 10 and engages the engaging portion 34 with the base end portion 10a, thereby returning the pusher 12 when negative pressure is generated. Can be easily regulated. In this manner, the suction syringe 2 can easily regulate the return of the pusher 12 under a state where a negative pressure is generated in the syringe barrel 10 with a simple structure.

Further, the tip portion 20 and the shaft portion 22 are fitted by a groove 40 formed in the tip portion 20 and a projection 42 formed in the shaft portion 22 and slidably fitted to the groove 40. . Then, by sliding the protrusion 42 into the groove 40, the shaft portion 22 can be moved outward in the radial direction of the syringe barrel 10 while being guided by the groove 40. Therefore, the operability of the suction syringe 2 is improved.

Further, the fitting portion 40 a with the protrusion 42 in the groove 40 is formed along the radial direction of the syringe barrel 10. As a result, the pusher 12 can easily move outward in the radial direction of the syringe barrel 10. Therefore, the operability of the suction syringe 2 is significantly improved.

Further, the protrusion 42 is formed at a position eccentric with respect to the main body portion 22a of the shaft portion 22 on the side opposite to the side where the shaft portion 22 moves outward in the radial direction of the syringe barrel 10. Thereby, when the axial part 22 moves to the outer side of the radial direction of the injection cylinder 10, and engages with the base end part 10a, the engagement area of the engaging part 34 of the axial part 22 can be enlarged. Therefore, the engagement state between the shaft portion 22 and the base end portion 10a is stabilized. Therefore, the suction syringe 2 can reliably regulate the return of the pusher 12 under a state where a negative pressure is generated in the syringe barrel 10.

It should be noted that the above-described embodiment is merely an example, and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Syringe syringe 2 Suction syringe 10 Injection cylinder 10a Base end part 10d Inner peripheral surface 12 Pusher 20 Tip part 22 Shaft part 22a Main body part 22b End surface 30 Groove 30a Fitting part 32 Protrusion 34 Engagement part 40 Groove 40a Fitting Part 42 Projection Ls Center axis Lj (at the tip) Lj Center axis (at the main part of the shaft part) Lt (Projection) center axis

Claims

A syringe barrel connected to a suction catheter in a bottomed cylinder with an open proximal end;
A pusher that is movably inserted into the syringe barrel and generates a negative pressure in the syringe barrel by moving it in a direction of being pulled out of the syringe barrel;
Have
The pusher includes a tip portion to which a gasket is attached, and a shaft portion fitted to the tip portion,
When the pusher is moved in the direction of pulling out from the syringe barrel and the shaft portion is positioned outside the syringe barrel, the shaft portion moves in the radially outward direction of the syringe barrel and engages with the base end portion. By restricting the return of the pusher when negative pressure is generated,
A syringe for suction.
The suction syringe of claim 1, wherein
The tip portion and the shaft portion are fitted by a groove formed in the tip portion and a protrusion formed in the shaft portion and slidably fitted to the groove;
A syringe for suction.
The syringe for suction according to claim 2,
The fitting portion with the protrusion in the groove is formed so as to incline toward the direction in which the pusher is pulled out from the syringe barrel with respect to the radial direction of the pusher.
A syringe for suction.
The syringe for suction according to claim 2,
The fitting portion with the protrusion in the groove is formed along the radial direction of the syringe barrel,
A syringe for suction.
The syringe for suction according to any one of claims 1 to 4,
The protrusion is formed at a position that is eccentric to a side opposite to a side where the shaft portion moves in a radially outward direction of the syringe barrel with respect to a main body portion of the shaft portion;
A syringe for suction.