JP2956589B2 - Inflation and deflation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for expanding and contracting a balun catheter or the like used in angioplasty such as percutaneous transluminal coronary angioplasty (PTCA).

[0002]

2. Description of the Related Art In angioplasty such as PTCA, a balun catheter is inserted into a stenotic blood vessel, the balun is expanded at a high pressure of 6 atm or more, the stenosis is expanded, and then the balun is contracted instantaneously. Resume blood flow in the blood vessels.
In this manner, the blood flow is restarted by rapidly repeating the expansion and contraction of the balun of the catheter inserted into the blood vessel, and the catheter is taken out from the blood vessel, so that a great deal of time and labor required for the operation can be saved. However, this procedure requires skilled techniques, and requires quick and accurate operation, particularly when expanding and contracting the catheter. In general, the inflation / deflation device of a vasodilation catheter has the shape of a pressure gauge syringe having two operation modes, a release mode and an engagement mode. In the release mode, the inner cylinder (piston) can be freely slid within the outer cylinder of the syringe, and the fluid is sucked into the syringe and discharged from the syringe to rapidly expand and contract the balun. Used when On the other hand, in the engagement mode, the screw engraved on the inner cylinder shaft (piston shaft) is engaged with a threaded member or the like carried on the outer cylinder, so that the inner cylinder cannot be moved by sliding. The axial movement is only possible by rotating the inner cylinder shaft along the screw. This mode achieves and maintains the high pressure required to inflate the balun catheter. Since such high pressure is difficult to achieve manually, it is achieved by turning a screw. In this engagement mode, the pressure can be finely adjusted (increased or decreased) while the catheter is inflated.

In the meantime, in the conventional expansion / contraction device, an engagement mode is usually set, and in many cases, a switch is pressed to enter a release mode. These had to be a continuous push of the switch to maintain release mode, which was not an easy task. Further, in the release mode, since the piston must be slid while pressing the switch, another operation cannot be performed at the same time. For example, after aspirating fluid into the balun catheter, to remove gas in the syringe, grasp the outer cylinder while holding the tip of the catheter connected to the inflation / deflation device upward with one hand, and use the other hand. It was necessary to push the piston to expel gas from the syringe. However, the operation of grasping the outer cylinder while holding down the switch with one hand and further holding the catheter tip is troublesome, and if not used, it may contaminate the catheter tip,
There is a risk that the suctioned fluid may be erroneously discharged.

[0004] In order to solve this problem, an improved inflating / contracting device has been devised, which is capable of maintaining the engagement mode and the release mode without holding down the switch, and is commercially available. For example, it is as disclosed in JP-A-6-86823. However, these devices are complicated in structure, are expensive, are relatively easy to break down, and are difficult to repair when broken down.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to quickly and easily switch the mode in order to quickly and surely expand and contract the balun catheter, and to further simplify the structure. To provide a simple device.

[0006]

SUMMARY OF THE INVENTION In the present invention, a cylindrical outer cylinder, an inner cylinder slidably disposed in the inner cavity of the outer cylinder, and a screw connected to an end of the inner cylinder to at least a part thereof are provided. An engraved inner cylinder shaft, an engaging member carried in the rear end of the outer cylinder and having the inner cylinder shaft inserted therein, a spring mounted between the outer cylinder and the engaging member, and an engaging member A balun catheter comprising a switch member slidably mounted on the top and a cover member joined to the rear end of the outer cylinder and covering the rear end of the outer cylinder with an engagement member leaving a part of the switch member. An engagement member is provided so as to be movable in a direction perpendicular to the inner cylinder shaft together with a switch member, and the engagement member is provided on a part of a lumen wall into which the inner cylinder shaft is inserted. A screw engageable with the screw of the cylinder shaft is formed, and the cover member has an insertion hole into which the inner cylinder shaft is inserted, and a switch. A slit that allows the movement of the material and a guide path that guides the movement are formed, and the switch member cooperates with the guide path to move the switch member in two stages in the axial direction of the inner cylinder and in the direction perpendicular thereto. Induces
In addition, the above problem is solved by a medical inflation / contraction device characterized in that a guide for preventing movement at a predetermined position is formed.

More simply, a switch member having a specific structure which can be slidably mounted on the engagement member, a guide path for allowing the switch member to move in two steps, and a connection between the engagement member and the outer cylinder. The above problem was solved by a spring mounted between the two. Here, for the sake of simplicity, the following description will be made with the axial direction of the inner cylinder as the axial direction and the direction perpendicular to the inner cylinder axis as the vertical direction. The working mechanism of this device will be described in detail in Examples and Embodiments. However, simply, the cooperation of a guide, a guide path, and a spring causes the switch member to move in two steps in the vertical and axial directions. In conjunction therewith, the engaging member is moved up and down, and the switch member is held at a predetermined (lower) position on the guide path. When the engaging member moves downward in conjunction with the switch member, the inner cylinder shaft and the engaging member disengage, and the inner cylinder shaft can freely slide in the outer cylinder (release mode). When the engaging member moves upward in conjunction with the switch member, the detached inner cylinder shaft and the engaging member are engaged with each other by the screws. In this engaged state, the inner cylinder shaft cannot slide freely in the outer cylinder, but only by rotating the inner cylinder shaft along the screw,
It is possible to move inside the outer cylinder (engagement mode). As described above, the engagement member is moved up and down by the switch member, the guide path, and the spring, and the state is maintained. Thereby, the engagement and disengagement of the engagement member and the inner cylinder shaft, that is, the selection of the engagement mode and the release mode, and the maintenance of the mode become possible.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inflation and deflation device of the present invention has an outer cylinder and an inner cylinder that slides in its inner cavity, and in that respect it is not much different from an ordinary syringe. What is different is that, even if the pressure in the syringe becomes high during injection, the inner cylinder is not pushed back but can maintain its position without being pushed back, and furthermore, means for applying pressure for injection are provided. The expansion / contraction device of the present invention is mainly provided with a cylindrical outer cylinder, an inner cylinder slidably disposed in the outer cylinder bore, and a rear end (an end opposite to the catheter mounting side) of the inner cylinder. An inner cylinder shaft having a diameter smaller than that of the connected inner cylinder, an engagement member carried in the rear end of the outer cylinder and capable of screwing with the inner cylinder shaft, a spring mounted between the engagement member and the outer cylinder, It comprises a switch member slidably mounted on the joint member and a cover member joined to and mounted on the switch member at the rear end of the outer cylinder. An embodiment will be described below for each component.

The diameter of the outer cylinder is important in the present device. That is, when the diameter of the outer cylinder is increased, the force required to slide the inner cylinder increases, and it becomes difficult to inject the liquid in the outer cylinder. However, if the diameter of the outer cylinder is too small (the amount of liquid to be injected is almost constant), the length of the outer cylinder must be increased. Also,
If the outer cylinder is made thinner, molding becomes difficult, and the desired shape cannot be produced. Therefore, the diameter of the outer cylinder is 1
6 to 21 mm is suitable, and 18 to 19 mm is more preferable. The length of the outer cylinder is suitably 60 to 100 mm,
0-100 mm is more preferable. The material of the outer cylinder is selected from hard resins such as polycarbonate in order to provide pressure resistance. It is preferable to form a port for pressure measurement at the distal end (the end on the catheter mounting side) of the outer cylinder. At the rear end of the outer cylinder, a through hole for inserting an engaging member and supporting the engaging member is formed in a vertical direction. The shape of the through hole is not particularly limited, but it is necessary that the engaging member can be attached and that the supporting member is supported so as not to move freely in the axial direction. A mounting portion for mounting the spring is formed on the edge of the through hole. The mounting portion needs a space for stably mounting the spring. Further, it is preferable to form a spring mounting assisting means on the mounting portion so that the spring can be easily mounted. Specifically, it is a projection formed on the mounting portion and having an appropriate length and diameter. The projection makes it easy for the spring to be mounted, and makes it difficult for the mounted spring to come off. The shape and dimensions of the spring mounting assisting means are not particularly limited, but those which do not hinder expansion and contraction of the spring and which can easily be mounted by the spring are preferable. Further, the rear end portion of the outer cylinder desirably has a larger diameter than the central portion of the outer cylinder in order to dispose members indispensable for the present invention, such as an engagement member and a switch member. The rear end of the outer cylinder is largely open so that the inner cylinder shaft can pass through.

The inner cylinder must be inserted into the bore of the outer cylinder so that when the high pressure is applied to the syringe, the fluid in the syringe does not leak out from the gap between the inner cylinder and the outer cylinder. Therefore, it is desirable that a part of the surface of the inner cylinder that comes into contact with the outer cylinder be made of an elastic body or be covered. At least a part or the whole of the inner cylinder shaft is formed with a screw that can be engaged with a screw formed on the engagement member. It is convenient to make the rear end of the inner cylinder shaft large in diameter so that the inner cylinder can easily slide and rotate.

The engaging member is supported in the rear end of the outer cylinder so as not to move in the axial direction, and is formed so that the inner cylinder shaft can be inserted into the center. The portion to be inserted is a U-shaped groove or an oblong hole or the like, and a screw formed on an inner cylinder shaft in a part of the inner wall of the groove or hole (for example, at a lower portion thereof). An engageable screw is formed. The screw of this engagement member is a so-called half-split shape, and is a partially formed screw as shown in FIG. When the engagement member is engaged with the inner cylinder shaft by the mutual screw, the inner cylinder cannot move in the outer cylinder unless it is rotated.
Conversely, when the screw engagement between the engagement member and the inner cylinder shaft is released,
The inner cylinder can be moved freely. In order to mechanically engage and disengage the inner cylinder shaft and the engagement member, a spring is mounted between the engagement member and the outer cylinder. A spring mounting portion for mounting a spring is provided on both outer side portions of the engaging member, and a spring mounting assisting means is formed on the spring mounting portion so that the spring can be easily mounted.
This is as described above for the mounting portion of the outer cylinder. Further, the spring mounting portion is provided with a falling-off preventing means for preventing the mounted spring from falling off. The drop-off prevention means is provided with two walls facing each other along the spring to be mounted, or a cylindrical wall (each having an appropriate length) surrounding the spring so as not to disturb the expansion and contraction of the spring. Simple and effective.

The spring is mounted between the spring mounting portion of the engaging member and the spring mounting portion of the outer cylinder, and the engaging member can move up and down by expansion and contraction of the spring. The spring is suitably coiled, but expands and contracts by a predetermined pressure.
The shape is not particularly limited as long as it has an appropriate compressive stress. However, the engagement between the screw of the engagement member and the screw of the inner cylinder shaft is held by the restoring force of the spring, and the position of the engagement member is moved by the expansion and contraction of the spring. Is important in this device. For example, if two engaging members are used on both sides, one (one) of the compressive stress is preferably 0.75 kgf to 1.5 kgf. That is, in order to maintain the engagement between the screws, the compression stress of the spring is 1.5 kgf (0.75
× 2) The above is necessary, and the compressive stress of the spring which is kept compressed by the engagement between the switch member and the guide path is 3 kgf. The length of the spring when the engaging member moves downward is L1 (compressed state), and the length of the spring when the engaging member moves upward is L2 (completely extended to engage the screws. It is not as good, but it is in an extended state compared to L1)
Then, the expansion / contraction ratio represented by L2 / L1 is 1.3 to 1.
Those between 5 are preferred. Guides are formed on both sides of the switch member. As described above, the guide guides the switch member along the guide path formed in the cover member and moves the switch member in two stages, that is, the axial direction and the vertical direction. .
Further, the switch, which has moved downward, is prevented from moving upward in cooperation with the guide, the guide path, and the spring. Various embodiments are conceivable as a guide, but if a short rod-like projection (FIG. 12) or a flange (FIG. 4) projecting downward on both sides is provided on both sides of the switch member, the object can be easily achieved. You. Providing a protruding portion on the upper surface of the switch member is convenient as a non-slip means when the switch is moved.

The cover member is joined to the rear end of the outer cylinder, and the engagement member, the rear end of the outer cylinder, and the like are covered except for the upper part of the switch member. One end of the cover member is open so that it can be joined to the rear end of the outer cylinder, and the other end is closed leaving a hole through which the inner cylinder shaft passes. Further, a slit having a width and a length such that the switch member is mounted and movable is formed in the cover member. A guide path for guiding the guide and moving the switch member is formed inside the cover member on both sides of the slit. Various embodiments are also conceivable for the guide path, for example, a groove having a depth such that the protrusion does not easily come off because it corresponds to the guide of the bar-like protrusion on both sides of the switch member. The guide can move freely in the groove. As shown in FIG. 12, the groove is composed of a vertically extending vertical groove and a horizontal groove formed in parallel to the axial direction from the lower end of the vertical groove. The guide path is flat and a rib is provided in the middle of the guide path in parallel with the slit so as to correspond to a flange guide projecting downward on both sides. By adopting the above shape, the switch member moves in two stages. That is, even if the guide member is moved in the axial direction along the guide path, the guide member hits the vertical groove or the rib and the switch member cannot move in the axial direction. Therefore, the switch member is moved in the vertical direction by moving the guide along the vertical groove or rib, and the switch member can be moved in the axial direction by releasing the constraint of the guide by the vertical groove or rib.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing the appearance of the expansion / contraction device 1, and FIG. 2 is an exploded schematic view of the present device for easy understanding. As shown in FIG. 2, the apparatus mainly includes an outer cylinder 2, an inner cylinder 3, an inner cylinder shaft 4, an engaging member 5, a spring 6
And a switch member 7 and a cover member 8.

Next, each component will be described. FIG. 3 is a plan view showing only the outer cylinder 2. Outer cylinder tip 9 of outer cylinder 2
Is formed with a port 10 for pressure measurement.
A pressure gauge 11 is connected to the end of the port. The lumen at the center of the outer cylinder is formed smoothly so that the inner cylinder 3 can slide, and has an appropriate inner diameter to maintain airtightness. The outer cylinder rear end 12 is provided with various members required for the present apparatus, and thus has a larger diameter than the center and the front end, and has a through hole 13 so that the engaging member 5 can be carried there. Are formed. A spring 6 is provided on both edges of the through hole 13.
A mounting portion 14 is formed as a space for mounting the mounting portion, and the mounting portion 14 is a frame for the engaging member 5 in the outer cylinder. Then, the engaging member 5 can move up and down in the outer cylinder by the spring 6. Spring mounting assisting means 15 is formed on the mounting portion 14 so that the spring 6 can be easily mounted. At the time of manufacturing the device, the spring mounting assisting means 15 makes it easy to mount the spring 6, and also prevents the spring 6 from coming off or shifting during use. The outer cylinder rear end 16 is the inner cylinder shaft 4
It is open so that it can pass through.

It is desirable that a part of the outer surface of the inner cylinder 3 which comes into contact with the inner wall of the outer cylinder 2 be made of an elastic body 17 or be covered. Alternatively, an O-ring or the like may be attached. Inner cylinder 3
A screw 18 is formed on the inner cylindrical shaft 4 detachably connected to the rear end of the inner cylindrical shaft 4 (FIG. 2). The rear end 19 of the inner cylinder shaft has a diameter larger than that of the inner cylinder shaft 4 so as to be easily supported by hand. FIG.
The engagement member 5 shown in FIG.
0 has a half screw 21 partially formed.
A spring mounting portion 22 for mounting the spring 6 is provided on both sides of the engaging member 5, and the mounting portion 1 is mounted on the spring mounting portion 22.
4 is provided with the same spring mounting assisting means 23 as provided in FIG. Further, the spring mounting portion 22 includes a spring drop prevention means 24 so that the spring does not come off or slip during use.
Is also provided.

The spring 6 has a coil shape as shown in FIG. 2, and is mounted between the spring mounting portion 22 and the mounting portion 14. Therefore, two springs 6 are mounted on both sides of the engagement member 5. Under the switch member 7 shown in FIG. 4, two mounting means 25 are formed so that the (switch member 7) is slidably mounted on the engagement member 5. A flange-like guide 2 for guiding the switch member 5 is provided below both sides.
6 are formed. In order to prevent slippage when the switch member 7 is moved in the axial direction, 2
A book protrusion 27 is formed. As shown in FIG.
The end of the cover member 8 on the side joined to the rear end 12 of the outer cylinder is open, and the opposite end is an insertion hole 2 into which the inner cylinder shaft 4 is inserted.
8 closed. A slit 29 is formed at the center of the upper surface of the cover member 8 from the open end to a position short of the closed end. Guide paths 30 for guiding the guide 26 are formed inside the cover member 8 on both sides of the slit 29. A rib 31 is formed in the middle of the guide path 30 so as to hold the switch member 7 by lowering the guide 26 downward.

Next, the combination (arrangement) of the components will be described with reference to FIG. First, after the inner cylinder 3 is inserted into the inner cavity of the outer cylinder 2, the switch member 7 is mounted on the engagement member 5. That is, the switch member 7 is mounted so that the mounting means 25 of the switch member 7 fits into the groove 20 of the engaging member (see also FIGS. 4 and 5). The spring 6 is fitted to the spring attachment assisting means 23, and the spring 6 is attached to the spring attachment portion 22 of the engagement member 5. The engaging member 5 on which the spring 6 and the switch member 7 are mounted is connected to the outer cylinder rear end 12.
In the through hole 13. That is, the spring 6 is supported so that the free (unfitted) end of the spring 6 is fitted to the spring mounting assisting means 15 of the mounting portion 14. Then, the spring 6 expands and contracts by the pressing of the switch member 7, and as a result, the engaging member 5 can move up and down in the outer cylinder. Next, the tip of the inner cylinder shaft 4 is inserted through the insertion hole 28 of the cover member 8, and the tip of the inner cylinder shaft 4 is further inserted from the outer cylinder rear end 16. The engaging member 5 is carried in the rear end portion 12 of the outer cylinder, and the distal end of the inner cylinder shaft is inserted along the groove 20 of the engaging member 5. The end of the inner cylinder 3 inserted into the inner cavity of the outer cylinder is connected to the tip of the inner cylinder shaft. Finally, the cover member 8 is moved along the inner cylinder shaft 4 and joined to the outer cylinder rear end 12 so as to cover the engagement member 5 except for the upper part of the switch member.

Next, the operation mechanism of the present apparatus will be briefly described. First, switching between the engagement mode and the release mode by moving the switch member 7 will be described. As shown in FIG. 7, due to the restoring force of the spring 6 mounted between the mounting portion 14 in the outer cylinder and the spring mounting portion 22 of the engaging member 5, the engaging member 5 is normally pushed upward. And is located above the inside of the outer cylinder. In this state, the half screw 21 formed on the engaging member 5 and the screw 1 formed on the inner cylinder shaft 4
8 is in screw engagement. Since this screw engagement is held by the restoring force of the spring 6, it does not easily come off. Further, since the engaging member 5 is carried in the rear end portion 12 of the outer cylinder, it cannot move in the axial direction. Due to this screw engagement, the inner cylinder 3 cannot slide freely in the outer cylinder 2 and can withstand high pressure. Furthermore, it is also possible to obtain a higher pressure by rotating the inner cylinder shaft 4 along the screw, so that a fluid can be injected at a specific pressure into a necessary part in the patient (engagement). mode). As shown in FIG. 8, when the switch member 7 is pushed downward, the engaging member 5 also moves downward in conjunction therewith. When the engaging member 5 moves downward, the inner cylinder shaft 4 engaged with the screw is detached from the engaging member 5, and the spring 6 is simultaneously compressed. Because it has detached from the engagement member 5,
The axial movement of the inner cylinder shaft 4 is free. In this detached state, the inner cylinder shaft 4 can freely slide in the outer cylinder, and can suck liquid into the syringe and eliminate bubbles (release mode). However, if a force opposing the restoring force of the amplified spring is not applied, the mode automatically returns to the engagement mode.

Second, a mechanism for holding the engaging member 5 at a predetermined position will be described. FIG. 9 shows a schematic partial cross-sectional view in the axial direction so that each arrangement (combination) of the outer cylinder 2, the switch member 7, the engagement member 5, and the cover member 8 in the present apparatus can be easily understood. As shown in FIG. 10, the switch member 7 is moved on the cover member 8 along with the guide 26 along the guide path 30. In this state, the engagement member 5 is located above the outer cylinder, and the apparatus is in the engagement mode. As can be seen in the figure, the guide 26 cannot move rearward in the axial direction (in the direction of the insertion hole 28) because of the obstruction of the rib 31. However, the engagement member 5 can move up and down in the outer cylinder by the expansion and contraction of the spring 6, and the switch member 7 can also move up and down because it is mounted on the engagement member 5. Therefore, when the switch member 7 is pushed downward as shown in FIG. 11, the guide 26, which has been hindered from moving backward in the axial direction by the rib 31, moves below the rib 31, thereby enabling axial movement. . When the switch member 7 is moved rearward in the axial direction in this state, only the switch member 7 slides in the axial direction on the engagement member 5 because the engagement member 5 is carried in the rear end portion 12 of the outer cylinder. I do.

When the switch member 7 is moved within the range permitted by the slit 29 of the cover member 8, the guide 26 enters below the rib 31 as shown in FIG. 11, and the spring 6 is compressed. However, since the guide 26 is locked by the rib 31, the upward movement of the switch member 7 is prevented. Therefore, the switch member 7 is held while moving downward, and the engagement member 5 is also maintained in a state of being detached from the inner cylinder shaft 4 as shown in FIG. That is, the device is in the release mode. In this state, since the guide 26 is pressed against the rib 31 by the restoring force of the spring 6, the switch member 7 cannot move in the axial direction unless a force is applied (FIG. 11). Therefore, the switch member 7 does not move in the axial direction without permission, but is held at that position.

To return the device to the engagement mode, the switch member 7 may be moved in the opposite direction. When the switch member 7 is moved forward in the axial direction (in this case, only the switch member 7 is moved on the engagement member 5), the guide 26 is moved.
Is released from the engagement of the rib 31, the switch member 7 can be moved upward, and the switch member is pushed upward by the restoring force of the spring. In conjunction with this, the engaging member 5 moves upward, and as a result, the inner cylinder shaft 4 and the engaging member 5 are screw-engaged as shown in FIG. As described above, by the cooperation of the switch member 7, the rib 31 (the guide path 30) and the spring 6, the engaging member 5 can be moved up and down and held at a predetermined position. As a result, the engagement and disengagement between the engagement member 5 and the inner cylinder shaft 4 can be performed, and the state can be maintained. That is, the engagement mode and the release mode of the present apparatus can be easily switched, and the mode can be maintained.

[0023]

According to the inflation / contraction device of the present invention, the mode can be switched easily and quickly, so that the inflation / contraction of the balun of the vascular catheter can be performed quickly and reliably. Further, since the present apparatus has a simpler structure, it is less likely to break down, and even if it breaks down, it can be easily repaired.

[Brief description of the drawings]

FIG. 1 is a plan view showing the appearance of an expansion / contraction device (the present device) of the present invention.

FIG. 2 is an exploded schematic view showing main components of the apparatus.

FIG. 3 is a plan view showing an outer cylinder of the apparatus.

FIG. 4 is a perspective view showing a switch member of the apparatus.

FIG. 5 is a perspective view showing an engagement member of the present apparatus.

FIG. 6 is a perspective view showing a cover member of the present apparatus.

FIG. 7 is a schematic cross-sectional view in a direction perpendicular to the axis, showing an engagement state between an engagement member and an inner cylinder shaft in the apparatus.

FIG. 8 is a schematic cross-sectional view showing a detached state of the engagement member and the inner cylinder shaft in FIG. 7;

FIG. 9 is a schematic partial sectional view in the axial direction showing an arrangement of an outer cylinder, a switch member, an engagement member, and a cover member of the apparatus.

FIG. 10 is a schematic partial cross-sectional view in the axial direction showing a positional relationship between a switch member and a cover member in an engagement mode of the device.

FIG. 11 is a schematic partial sectional view in the axial direction showing a positional relationship between a switch member and a cover member in a release mode of the apparatus.

FIG. 12 is a schematic view showing a structure of a switch member and a cover member according to another embodiment of the present invention.

[Explanation of symbols]

 1. Expansion / contraction device 2. Outer cylinder 3. Inner cylinder 4. Inner cylinder shaft 5. Engaging member 6. Spring 7. Switch member 8. Cover member 9. 10. End of outer cylinder Port 11. Pressure gauge 12. 12. Rear end of outer cylinder 13. Through hole Placement part 15. Spring mounting assisting means 16. 17. Rear end of outer cylinder Elastic body 18. Screw 19. Rear end of inner cylinder shaft 20. Groove 21. Half screw 22. Spring mounting part 23. Spring mounting assisting means 24. Spring fall prevention means 25. Mounting means 26. Guide 27. Projection 28. Insertion hole 29. Slit 30. Guide path 31. Rib 32. Rod-shaped protrusion

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61M 25/00

Claims (10)

(57) [Claims] A cylindrical outer cylinder, an inner cylinder slidably disposed in an inner cavity of the outer cylinder, an inner cylinder shaft connected to an end of the inner cylinder and having at least a part of a screw cut therein; An engaging member carried in the rear end of the outer cylinder and having the inner cylinder shaft inserted therein, a spring mounted between the outer cylinder and the engaging member, and slidably mounted on the engaging member. A device for expanding and contracting a balun catheter, comprising a switch member and a cover member joined to a rear end of the outer cylinder and covering an engagement member and a rear end of the outer cylinder while leaving a part of the switch member, The engaging member is provided so as to be movable in a direction perpendicular to the inner cylinder shaft together with the switch member, and the engaging member can engage with a screw of the inner cylinder shaft on a part of a lumen wall into which the inner cylinder shaft is inserted. The cover member has an insertion hole into which the inner cylinder shaft is inserted, and a slit for allowing the movement of the switch member. And a guide path for guiding the movement thereof is formed. The switch member cooperates with the guide path to guide the switch member in two stages of movement in the axial direction of the inner cylinder and in the direction perpendicular thereto, and at a predetermined position. A medical inflation / shrinkage device, wherein a guide for preventing movement is formed. 2. The medical inflation / contraction device according to claim 1, wherein the guides are convex portions formed on both side portions of the switch member. 3. The medical inflation / contraction device according to claim 2, wherein the protrusion is a flange formed below both sides of the switch member. 4. The medical inflation / contraction device according to claim 2, wherein the guide path is provided inside the cover member in parallel with the slit. 5. The guide path according to claim 3, wherein a rib is formed in the guide path.
Or the medical inflation / deflation device according to any one of the above items 4. 6. The guide path includes a vertical groove formed on both inner side surfaces of the cover member and perpendicular to the inner cylinder axis, and a lateral groove formed from a lower end of the groove and parallel to the inner cylinder axis. Claim 2
Or the medical inflation / deflation device according to any one of the above items 4. 7. The medical inflation / contraction device according to claim 1, wherein a non-slip means for movement is formed on an upper surface of the switch member. 8. The outer cylinder according to claim 1, wherein a through hole for supporting an engaging member is formed at a rear end of the outer cylinder, and a mounting portion for mounting a spring is formed on an edge of the through hole. The medical inflation / deflation device according to any of the above items. 9. A spring mounting portion in which the engaging member has a U-shaped groove or an oblong hole into which an inner cylinder shaft can be inserted, and springs are mounted on both outer side portions of the engaging member. The medical inflation / deflation device according to any one of claims 1 to 8, comprising: 10. The device according to claim 1, wherein a spring mounting assisting means is formed on the mounting portion or the spring mounting portion, and a spring falling-off preventing means is further formed on the spring mounting portion. The medical inflation / deflation device according to claim.