WO2014199478A1

WO2014199478A1 - Suction syringe

Info

Publication number: WO2014199478A1
Application number: PCT/JP2013/066310
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: 2013-06-13
Filing date: 2013-06-13
Publication date: 2014-12-18

Abstract

In this suction syringe, the engagement section of a lock mechanism integrally formed with a pusher is provided pressed inward or outward in the radial direction of a syringe cylinder by the syringe cylinder. When the pusher is moved in the direction of pulling the pusher out of the syringe cylinder and the engagement section is positioned outside the syringe cylinder, the engagement section moves inward or outward in the radial direction of the syringe cylinder by elastic force and engages a base end.

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, in Patent Document 1, a suction operation is performed while pressing one end of the piston radially inward and opening the other end of the syringe piston retrograde blocker radially outward. A technique is disclosed in which the piston is locked and the piston is prevented from moving in the direction opposite to the suction operation direction.

Further, in Patent Document 2, a stick-shaped protrusion having elasticity extending obliquely outward and forward is integrally formed on the plunger rod, and the tip of the stick-shaped protrusion is brought into contact with the finger grip, whereby the plunger rod A technique is disclosed in which inadvertent forward movement is restricted.

Also, Patent Document 3 discloses a technique in which when the plunger is pushed into the syringe barrel, the engaging portion of the protector collides with the proximal end portion of the syringe barrel and the movement of the plunger is restricted.

JP 09-0666105 A Japanese Patent Laid-Open No. 08-229122 Japanese Patent Laid-Open No. 08-164206

However, in the technique of Patent Document 1, when performing a suction operation by moving the piston in the direction of pulling out from the syringe barrel, it is necessary to apply a force that simultaneously presses one end of the piston in the radial direction. Becomes complicated. In particular, when performing treatment to remove foreign matters such as blood clots clogged in the blood vessel as described above, the handling of the operator may be troublesome in this way. It is desirable to be easily locked.

Moreover, the technique of patent document 2 and the technique of patent document 3 are techniques for restricting the inadvertent forward movement of the plunger when a medicine is preliminarily enclosed in a cartridge or an outer cylinder. It is not a technology that regulates plunger movement during operation. Patent Documents 2 and 3 do not disclose any method for locking the plunger in the suction operation.

Accordingly, the present invention has been made to solve the above-described problems, and a suction syringe capable of easily regulating the return of the pusher under a state in which a negative pressure is generated in the syringe barrel. The purpose is to provide.

One aspect of the present invention made in order to solve the above problems is a syringe for suction, which has a bottomed cylindrical shape 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 to be pulled out from the syringe barrel, and an engaging portion that engages with the base end portion, and is elastically deformable to the pusher And a locking mechanism that restricts the return of the pusher when negative pressure is generated by engaging the base end with the engaging portion, and the engaging portion is It is arranged in a state of being urged inwardly or radially outwardly of the syringe barrel by the syringe barrel, and moves the pusher in the direction of pulling out the syringe barrel so that the engaging portion is moved out of the syringe barrel. When positioned, the engaging portion is elastically Moves in the radially outward direction or radially inward direction of the serial syringe engaging said proximal end, characterized by.

According to this aspect, when the pusher is moved in the direction of pulling out from the syringe barrel and the negative pressure is generated in the syringe barrel, if the engagement portion of the lock mechanism is positioned outside the syringe barrel, the engagement portion is elastic. It moves by force and engages with the proximal end. Therefore, only by the handler of the suction syringe moving the pusher in the direction of pulling it out of the syringe barrel, the engaging portion naturally engages with the base end portion, and the return of the pusher is restricted. Therefore, the operator can lock (lock) the pusher with a single touch under a state where negative pressure is generated in the syringe barrel, and the return of the pusher can be easily regulated.

In the above aspect, it is preferable that the locking mechanism is formed in a U shape that is open to the bottom side of the syringe barrel.

According to this aspect, since the lock mechanism includes the double elastic portion, even if it is disposed in a state of being urged inward in the radial direction of the syringe barrel for a long time, deformation due to creep is suppressed and elastic force is exerted. Is maintained. Therefore, when the pusher is moved in the direction of pulling out from the syringe barrel and the engaging portion is positioned outside the syringe barrel, the engaging portion is surely moved outward in the radial direction of the syringe barrel by the elastic force. Engage with the end. Therefore, the return of the pusher can be stably regulated under a state where a negative pressure is generated in the syringe barrel.

Further, in the above aspect, the locking mechanism is formed from the vicinity of the bottom of the syringe barrel to the vicinity of the proximal end in the axial direction of the pusher in a state of being arranged in the syringe barrel. Is preferred.

According to this aspect, since the elastic portion of the lock mechanism is formed long in the axial direction of the pusher, even if it is arranged for a long time in a state of being urged radially inward of the syringe barrel, The deformation due to is further suppressed.

In the above aspect, it is preferable that an elastic member is disposed in the U-shaped gap of the lock mechanism.

According to this aspect, when the pusher is moved in the direction of pulling out from the syringe barrel and the engagement portion is positioned outside the syringe barrel, the engagement portion is radially moved by the radial elastic force of the pusher by the elastic member. Move outside of. Therefore, the engaging part can be reliably engaged with the base end part.

Further, in the above aspect, the locking mechanism intersects with the first inclined portion that inclines toward the bottom side of the syringe barrel toward the radially outward direction of the pusher, and the inclination direction of the first inclined portion. It is preferable to include a second inclined portion.

According to this aspect, even if the lock mechanism is arranged in a state of being urged outward in the radial direction of the syringe barrel, the urging force from the syringe barrel is distributed to the first inclined portion and the second inclined portion. Therefore, deformation due to creep is suppressed and the elastic force is maintained. For this reason, when the pusher is moved in the direction of pulling out the syringe barrel and the engaging portion is positioned outside the syringe barrel, the engaging portion is surely moved inward in the radial direction of the syringe barrel by the elastic force. Engage with the end. Therefore, the return of the pusher can be stably regulated under a state where a negative pressure is generated in the syringe barrel.

Further, in the above aspect, the second inclined portion is formed from the vicinity of the bottom portion of the syringe barrel to the vicinity of the base end portion in the axial direction of the pusher while being arranged on the outer peripheral surface of the syringe barrel. It is preferable.

According to this aspect, since the second inclined portion of the lock mechanism is formed long in the axial direction of the pusher, even if the lock mechanism is arranged for a long time in a state of being biased outward in the radial direction of the syringe barrel. Further, deformation due to creep is further suppressed.

Moreover, in the above aspect, it is preferable that the pusher and the lock mechanism are integrally molded products made of resin.

According to this aspect, the manufacturing cost can be reduced.

According to the suction syringe of the present invention, the return of the pusher can be easily regulated under a state where 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. It is an external appearance perspective view of the syringe for suction of Example 1, and is a figure showing the state where the engaging part is engaged with the base end part. FIG. 4 is a sectional view taken along line BB in FIG. 3. 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. 6 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 2, and is a figure which shows the state which the engaging part has engaged with the base end part. FIG. 8 is a DD sectional view of FIG. 7.

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 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 engaging portion 26 is engaged with the proximal end portion 10a. It is a figure which shows the state which is match | combining. 4 is a cross-sectional view taken along the line BB in FIG.

As shown in FIG. 1 to FIG. 4, 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 is provided with a rod-shaped main body portion whose cross section in the radial direction perpendicular to the axial direction (the left-right direction in FIGS. 2 and 4) is substantially cross-shaped. The pusher 12 is operated to move the gasket 14 provided at the tip of the pusher 12, that is, the end opposite to the flange 12 a in the axial direction of the pusher 12 along the axial direction of the syringe barrel 10. To do. As described above, the pusher 12 is movably inserted inside the inner peripheral surface 10d of the syringe barrel 10 and generates a negative pressure in the syringe barrel 10 by moving in the direction of being pulled out of the syringe barrel 10. Can do. 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.

Also, as shown in FIGS. 1 to 4, a lock mechanism 16 of an elastic member is integrally formed with the pusher 12. In this embodiment, the pusher 12 and the lock mechanism 16 are integrally molded products made of resin. As shown in FIGS. 2 and 4, the lock mechanism 16 is formed in a U-shaped cross section in the axial direction of the pusher 12 that is open to the bottom side of the syringe barrel 10 (the distal end side of the pusher 12). ing. Specifically, the lock mechanism 16 includes a first spring portion 20 and a second spring portion 22 corresponding to a U-shaped linear portion, and a bottom portion 24 corresponding to a U-shaped bottom portion. The first spring portion 20 and the second spring portion 22 are connected via the bottom portion 24.

In the lock mechanism 16, the first spring portion 20 is disposed inside the pusher 12 in the radial direction, and the second spring portion 22 is disposed outside the pusher 12 in the radial direction. In the state where no negative pressure is generated in the syringe barrel 10, the first spring portion 20 and the second spring portion 22 have a diameter of the syringe barrel 10 by the syringe barrel 10 as shown in FIGS. 1 and 2. It is arranged in a state of being urged inside the direction. In the example shown in FIG. 2, the first spring portion 20 and the second spring portion 22 are arranged so as to be parallel to the axial direction of the pusher 12. When the first spring portion 20 and the second spring portion 22 are not biased by the syringe barrel 10, the diameter of the pusher 12 with respect to the axial direction of the pusher 12 is shown in FIGS. 3 and 4. It is elastically deformed in the radial direction of the pusher 12 so as to incline outward in the direction.

Further, the lock mechanism 16 includes an engaging portion 26 and a flange portion 28 at the tip of the second spring portion 22 (the end opposite to the bottom portion 24). The engaging portion 26 is a tip surface of the second spring portion 22. As shown in FIGS. 3 and 4, the engaging portion 26 can be engaged with the proximal end portion 10 a of the syringe barrel 10. Thereby, the lock mechanism 16 can restrict the return of the pusher 12 when a negative pressure is generated in the syringe barrel 10. Further, the flange portion 28 is formed so as to protrude from the engaging portion 26 in the axial direction of the second spring portion 22.

Further, as shown in FIG. 2, the lock mechanism 16 is arranged in the vicinity of the bottom portion (mouth portion 10 b) of the syringe barrel 10 in the axial direction of the pusher 12 in a state of being disposed inside the inner peripheral surface 10 d of the syringe barrel 10. To the vicinity of the base end portion 10a. Thus, the lock mechanism 16 is formed long in the axial direction of the pusher 12. As shown in FIG. 2, the lock mechanism 16 is formed in a length of 60% to 70% with respect to the length of the syringe barrel 10 in the axial direction of the pusher 12, for example.

Furthermore, the lock mechanism 16 includes an operation unit 30 in the vicinity of the tip of the second spring portion 22. A U-shaped gap of the lock mechanism 16, that is, a gap between the first spring portion 20 and the second spring portion 22, a metal leaf spring or metal that can be elastically deformed in the radial direction of the pusher 12. An elastic member such as a spring may be arranged.

[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 and 2, the suction syringe 1 is disposed inside the inner peripheral surface 10 d 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 where it is pushed in. At this time, the lock mechanism 16 (engagement portion 26) is arranged in a state of being urged by the syringe barrel 10 toward the inside of the syringe barrel 10 in the radial direction.

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. 3 and 4, when the engaging portion 26 is located outside the syringe barrel 10, the lock mechanism 16 is released from the state biased by the syringe barrel 10. Then, the lock mechanism 16 is elastically deformed by the elastic force of the first spring part 20 and the elastic force of the second spring part 22, and the engaging part 26 and the collar part 28 move to the outside in the radial direction of the syringe barrel 10. .

And the engaging part 26 contacts the base end part 10a. At this time, the collar portion 28 comes into contact with the inner peripheral surface 10 d of the syringe barrel 10. Thus, the engaging part 26 engages with the base end part 10a. 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. As described above, the suction syringe 1 allows the operator to lock (lock) the pusher 12 with one touch in a state where a negative pressure is generated in the syringe barrel 10. The return of 12 can be easily regulated.

Thereafter, when the handler releases the generation of the negative pressure in the syringe barrel 10, as shown in FIGS. 3 and 4, the engaging portion 26 is engaged with the proximal end portion 10a. Then, the operation unit 30 of the lock mechanism 16 is pushed inward in the radial direction. Then, the engaging part 26 moves away from the base end part 10a of the syringe barrel 10, and the engagement with the base end part 10a is released. Then, while the lock mechanism 16 is pushed into the inner peripheral surface 10 d of the syringe barrel 10, the pusher 12 is moved in a direction to be pushed into the inner peripheral surface 10 d of the syringe barrel 10. Thereby, the syringe 1 for suction | inhalation will be in the state shown in FIG. 1 and FIG. 2, and generation | occurrence | production of the negative pressure in the injection cylinder 10 is cancelled | 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 has a syringe barrel 10 connected to a suction catheter. In addition, the suction syringe 1 has a pusher 12 that is movably inserted into the syringe barrel 10 and generates a negative pressure in the syringe barrel 10 by being moved in a direction of being pulled out of the syringe barrel 10. Furthermore, the suction syringe 1 has a lock mechanism 16 that restricts the return of the pusher 12 when negative pressure is generated. The lock mechanism 16 includes an engagement portion 26 that engages with the base end portion 10a, is integrally formed with the pusher 12 so as to be elastically deformable, and the engagement portion 26 engages with the base end portion 10a. The return of the pusher 12 when negative pressure is generated is restricted. The engaging portion 26 is arranged in a state of being urged inward in the radial direction of the syringe barrel 10 by the syringe barrel 10, and moves the pusher 12 in the direction of pulling out the syringe barrel 10 to engage the engaging portion 26. Is positioned outside the syringe barrel 10, the engaging portion 26 moves outward in the radial direction of the syringe barrel 10 by elastic force and engages with the proximal end portion 10 a.

As a result, when the pusher 12 is moved in the direction in which the pusher 12 is pulled out of the syringe barrel 10 to generate a negative pressure in the syringe barrel 10, the engagement portion 26 of the lock mechanism 16 is positioned outside the syringe barrel 10. The portion 26 is moved by the elastic force and engaged with the base end portion 10a. Therefore, only by the operator moving the pusher 12 in the direction of pulling out the syringe barrel 10, the engaging portion 26 naturally engages with the base end portion 10 a and the return of the pusher 12 is restricted. Therefore, in the syringe 1 for suction, the operator can lock the pusher 12 to the syringe barrel 10 with a single touch while the negative pressure is generated in the syringe barrel 10, and the pusher 12 can be returned. It can be easily regulated.

Also, the lock mechanism 16 is formed in a U-shape that is open to the bottom side of the syringe barrel 10. Thereby, since the lock mechanism 16 includes the first spring portion 20 and the second spring portion 22 that are double elastic portions, the lock mechanism 16 is arranged for a long time in a state of being biased radially inward of the syringe barrel 10. However, the deformation due to creep is suppressed and the elastic force is maintained. Therefore, when the pusher 12 is moved in the direction in which the pusher 12 is pulled out of the syringe barrel 10 and the engaging portion 26 is positioned outside the syringe barrel 10, the engaging portion 26 is reliably moved in the radial direction of the syringe barrel 10 by the elastic force. It can move outward and engage the proximal end 10a. Therefore, the return of the pusher 12 can be stably regulated under a state where a negative pressure is generated in the syringe barrel 10.

Further, the lock mechanism 16 is formed from the vicinity of the bottom portion of the syringe barrel 10 to the vicinity of the proximal end portion 10a in the axial direction of the pusher 12 in a state where the lock mechanism 16 is disposed inside the inner peripheral surface 10d of the syringe barrel 10. As described above, since the first spring portion 20 and the second spring portion 22 that are elastic portions of the lock mechanism 16 are formed long in the axial direction of the pusher 12, the lock mechanism 16 is attached to the inside of the syringe barrel 10 in the radial direction. Even if it is placed in a biased state for a long time, deformation due to creep is further suppressed.

Further, an elastic member such as a metal leaf spring or a metal spring may be disposed in the U-shaped gap of the lock mechanism 16. As a result, when the pusher 12 is moved in the direction in which the pusher 12 is pulled out of the syringe barrel 10 and the engaging portion 26 is positioned outside the syringe barrel 10, the engaging portion 26 moves outward in the radial direction by the elastic force of the elastic member. To do. Therefore, the engaging part 26 can be reliably engaged with the base end part 10a.

Further, the pusher 12 and the lock mechanism 16 are integrally molded products made of resin. Thereby, the manufacturing cost is reduced.

<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. 5 is an external perspective view of the suction syringe 2 of Example 2, in which the pusher 12 is disposed in the syringe barrel 10, and the engaging portion 56 is in the radial direction of the syringe barrel 10. It is a figure which shows the state urged | biased outside. 6 is a cross-sectional view taken along the line CC of FIG. FIG. 7 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 engaging portion 56 is engaged with the proximal end portion 10a. It is a figure which shows the state which is match | combining. FIG. 8 is a sectional view taken along the line DD of FIG.

[Configuration of suction syringe]
As shown in FIGS. 5 to 8, the pusher 12 in the suction syringe 2 of the second embodiment is integrally formed with a lock mechanism 40 of an elastic member as shown in FIGS. As shown in FIGS. 6 and 8, the lock mechanism 40 is formed in a clip shape in which the axial section of the pusher 12 is convex upward (outside in the radial direction of the pusher 12). Specifically, the lock mechanism 40 includes a first inclined portion 50, a second inclined portion 52, and a joint portion 54. The pusher 12 and the lock mechanism 40 are an integrally molded product made of resin.

As shown in FIG. 6 and FIG. 8, the first inclined portion 50 has a bottom portion (mouth portion 10 b) of the syringe barrel 10 as the axial cross section of the pusher 12 goes outward in the radial direction of the pusher 12. It inclines to the side (the front end side of the pusher 12). The inclination angle θ1 formed by the inclination direction of the first inclined portion 50 with respect to the axial direction of the pusher 12 is an acute angle. In the example shown in FIG. 6, the inclination angle θ1 is about 60 °.

As shown in FIGS. 6 and 8, the second inclined portion 52 is inclined such that the axial cross section of the pusher 12 intersects the inclined direction of the first inclined portion 50. Specifically, in the second inclined portion 52, the axial section of the pusher 12 is such that the bottom portion (mouth portion 10b) side of the syringe barrel 10 (the distal end portion side of the pusher 12) is the base end portion 10a side of the syringe barrel 10. It is formed so as to incline to the outer side in the radial direction of the pusher 12 toward the flange 12a side of the pusher 12. Note that the inclination angle θ2 formed by the inclination direction of the second inclination portion 52 with respect to the inclination direction of the first inclination portion 50 is an obtuse angle. In the example shown in FIG. 6, the inclination angle θ2 is about 120 °.

Further, in the state where no negative pressure is generated in the syringe barrel 10, the second inclined portion 52 is formed on the outer peripheral surface 10 e of the syringe barrel 10 by the syringe barrel 10 as shown in FIGS. 5 and 6. It arrange | positions in the state urged | biased to the radial direction outer side of the injection cylinder 10. As shown in FIG. And when the 2nd inclination part 52 is not urged | biased by the injection cylinder 10, as shown to FIG. 7 and FIG. 8, it elastically deforms to the inner side of the radial direction of the pusher 12. FIG.

Further, the lock mechanism 40 includes an engaging portion 56 and a flange portion 58 at the tip of the second inclined portion 52 (the end portion opposite to the joint portion 54). The engaging portion 56 is a tip surface of the second inclined portion 52. The engaging portion 56 can be engaged with the proximal end portion 10a of the syringe barrel 10 as shown in FIGS. Thereby, the lock mechanism 40 can restrict the return of the pusher 12 when a negative pressure is generated in the syringe barrel 10. Further, the flange portion 58 is formed so as to protrude from the engaging portion 56 in the axial direction of the second inclined portion 52. As shown in FIG. 6, when no negative pressure is generated in the syringe barrel 10, the surface on the syringe barrel 10 side of the collar portion 58 is in contact with the outer peripheral surface 10 e of the syringe barrel 10.

Further, as shown in FIG. 6, the second inclined portion 52 is arranged on the outer peripheral surface 10 e of the syringe barrel 10 from the vicinity of the bottom portion (mouth portion 10 b) of the syringe barrel 10 in the axial direction of the pusher 12. It is formed over the vicinity of the base end portion 10a. As described above, the second inclined portion 52 is formed long in the axial direction of the pusher 12. As shown in FIG. 6, the second inclined portion 52 is formed with a length of 60% to 70% with respect to the length of the syringe barrel 10 in the axial direction of the pusher 12, for example.

[Operation of suction syringe]
Next, the operation of the suction syringe 2 having such a configuration will be described. First, as shown in FIGS. 5 and 6, the suction syringe 2 is disposed inside the inner peripheral surface 10 d 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 where it is pushed in. At this time, the lock mechanism 40 (engaging portion 56) is arranged in a state of being urged by the syringe barrel 10 to the outside in the radial direction of the syringe barrel 10.

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. 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. 7 and 8, when the engaging portion 56 is positioned outside the syringe barrel 10, the lock mechanism 40 is released from the state of being biased by the syringe barrel 10. Then, the lock mechanism 40 is elastically deformed by the elastic force of the first inclined portion 50 and the elastic force of the second inclined portion 52, and the engaging portion 56 and the collar portion 58 move inward in the radial direction of the syringe barrel 10. .

Then, the collar part 58 enters the inside of the inner peripheral surface 10d of the syringe barrel 10, and the engaging part 56 contacts the base end part 10a. At this time, the collar portion 58 contacts the inner peripheral surface 10d of the syringe barrel 10. In this way, the engaging portion 56 engages with the base end portion 10a. 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. As described above, the suction syringe 2 allows the operator to lock the pusher 12 to the syringe barrel 10 with a single touch while the negative pressure is generated in the syringe barrel 10. The return of 12 can be easily regulated.

Thereafter, when the handler releases the generation of the negative pressure in the syringe barrel 10, as shown in FIGS. 7 and 8, the engaging portion 56 is engaged with the base end portion 10a. Once, the pusher 12 is slightly moved in the direction of withdrawing from the syringe barrel 10, and the joint portion 54 of the lock mechanism 40 is pushed inward in the radial direction. Then, since the 1st inclination part 50 and the 2nd inclination part 52 are raised by the radial direction outer side of the presser 12, the engaging part 56 leaves | separates from the base end part 10a, and the outer side of the radial direction of the presser 12 Moving. Then, the engaging portion 56 is disengaged from the base end portion 10a. Then, while the locking mechanism 40 is in contact with the outer peripheral surface 10 e of the syringe barrel 10, the pusher 12 is moved in a direction to be pushed inside the inner peripheral surface 10 d of the syringe barrel 10. Thereby, the syringe 2 for suction | inhalation will be in the state shown in FIG. 5 and FIG. 6, and generation | occurrence | production of the negative pressure in the injection cylinder 10 is cancelled | 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 has a syringe barrel 10 connected to a suction catheter. In addition, the suction syringe 2 has a pusher 12 that is movably inserted into the syringe barrel 10 and generates a negative pressure in the syringe barrel 10 by being moved in a direction of being pulled out of the syringe barrel 10. Furthermore, the suction syringe 2 has a lock mechanism 40 that restricts the return of the pusher 12 when negative pressure is generated. The lock mechanism 40 includes an engagement portion 56 that engages with the base end portion 10a, is integrally formed with the pusher 12 so as to be elastically deformable, and the engagement portion 56 engages with the base end portion 10a. The return of the pusher 12 when negative pressure is generated is restricted. The engaging portion 56 is arranged in a state of being urged outward in the radial direction of the syringe barrel 10 by the syringe barrel 10, and moves the pusher 12 in the direction of pulling out the syringe barrel 10 to engage the engaging portion 56. Is positioned outside the syringe barrel 10, the engaging portion 56 moves inward in the radial direction of the syringe barrel 10 by the elastic force and engages with the proximal end portion 10 a.

As a result, when the pusher 12 is moved in the direction in which the pusher 12 is pulled out from the syringe barrel 10 to generate a negative pressure in the syringe barrel 10, the engagement portion 56 of the lock mechanism 40 is positioned outside the syringe barrel 10. The part 56 is moved by elastic force and engaged with the base end part 10a. Therefore, only by the operator moving the pusher 12 in the direction of pulling out the syringe barrel 10, the engaging portion 56 naturally engages with the base end portion 10 a and the return of the pusher 12 is restricted. Therefore, the suction syringe 2 allows the operator to lock the pusher 12 to the syringe barrel 10 with a single touch while the negative pressure is generated in the syringe barrel 10, and the pusher 12 can be returned. It can be easily regulated.

The locking mechanism 40 includes a first inclined portion 50 that inclines toward the bottom side of the syringe barrel 10 toward the outer side in the radial direction of the pusher 12, and a second inclination that intersects the inclination direction of the first inclined portion 50. Part 52. Thereby, even if the lock mechanism 40 is arranged in a state of being urged outward in the radial direction of the syringe barrel 10, the urging force from the syringe barrel 10 is distributed to the first inclined portion 50 and the second inclined portion 52. Therefore, deformation due to creep is suppressed and the elastic force is maintained. Therefore, when the pusher 12 is moved in the direction in which the pusher 12 is pulled out from the syringe barrel 10 and the engaging portion 56 is positioned outside the syringe barrel 10, the engaging portion 56 is surely moved in the radial direction of the syringe barrel 10 by the elastic force. It can move inward and engage with the proximal end 10a. Therefore, the return of the pusher 12 can be stably regulated under a state where a negative pressure is generated in the syringe barrel 10.

Further, the second inclined portion 52 is formed from the vicinity of the bottom portion of the syringe barrel 10 to the vicinity of the proximal end portion 10a in the axial direction of the pusher 12 in a state where the second inclined portion 52 is disposed on the outer peripheral surface 10e of the syringe barrel 10. Thus, since the second inclined portion 52 is formed long in the axial direction of the pusher 12, the lock mechanism 40 is arranged for a long time in a state in which it is biased outward in the radial direction of the syringe barrel 10. However, deformation due to creep is further suppressed.

Further, the pusher 12 and the lock mechanism 40 are integrally molded products made of resin. Thereby, the manufacturing cost is reduced.

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 1,2: Syringe syringe 10: Injection cylinder, 10a: Base end part 10d: Inner peripheral surface, 10e: Outer peripheral surface 12: Pusher, 16: Lock mechanism 20: 1st spring part, 22: 2nd spring part 26 : Engaging part, 28: collar part 30: operation part, 40: locking mechanism 50: first inclined part, 52: second inclined part 56: engaging part, 58: collar part

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;
An engagement portion that engages with the base end portion is formed integrally with the pusher so as to be elastically deformable, and the engagement portion engages with the base end portion to cause the push when negative pressure is generated. A locking mechanism that regulates the return of the child;
Have
The engaging portion is arranged in a state of being biased inwardly or radially outwardly of the syringe barrel by the syringe barrel, and moves the pusher in a direction in which the pusher is pulled out from the syringe barrel. When the portion is positioned outside the syringe barrel, the engaging portion moves in the radially outward direction or radially inward direction of the syringe barrel by elastic force and engages with the proximal end portion,
A syringe for suction.
The suction syringe of claim 1, wherein
The locking mechanism is formed in a U-shape opened to the bottom side of the syringe barrel;
A syringe for suction.
The syringe for suction according to claim 2,
The locking mechanism is formed from the vicinity of the bottom of the syringe barrel to the vicinity of the proximal end in the axial direction of the pusher in a state of being arranged in the syringe barrel;
A syringe for suction.
The suction syringe according to claim 2 or 3,
An elastic member is disposed in the U-shaped gap of the locking mechanism;
A syringe for suction.
The suction syringe of claim 1, wherein
The locking mechanism includes a first inclined portion that inclines toward the bottom side of the syringe barrel as it goes in a radially outward direction of the pusher, and a second inclined portion that intersects the inclined direction of the first inclined portion. To have,
A syringe for suction.
The syringe for suction according to claim 5,
The second inclined portion is formed from the vicinity of the bottom portion of the syringe barrel to the vicinity of the proximal end portion in the axial direction of the pusher while being arranged on the outer peripheral surface of the syringe barrel.
A syringe for suction.
The suction syringe according to any one of claims 1 to 6,
The pusher and the lock mechanism are integrally molded products made of resin;
A syringe for suction.