JP2000135292A - Balloon fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balloon fixture for fixing a balloon firmly to a fixing shaft or connector with appropriate caulking strength, absorbing change of the thickness of the balloon even when the thickness is changed. SOLUTION: This balloon fixture consists of an inner caulking member 1 to be inserted into the end of a tubular-formed balloon B and an outer caulking member 2 to be engaged with the outside of the end of the balloon B. The inner caulking member 1 has caulking protrusions to expand the end of the balloon B in the radial direction and fix the balloon, and the outer caulking member 2 has a fixing cylinder 21 to clasp the end of the balloon B together with the caulking protrusions 13, 14 of the inner caulking member 1. The fixing cylinder 21 of the outer caulking member 2 is a tapered cylinder whose inner diameter becomes larger from the top end to the bottom end, and the caulking strength can be increased/decreased by the relative movement of the inner caulking member 1 inserted into the outer caulking member 2 in the axial direction. And slipping of the balloon in the axial direction is prevented by engagement of the sawlike protrusions 15 of the inner caulking member 1 with the engagement hooks 25 of the outer caulking member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a balloon fixing device. More specifically, the present invention relates to a balloon fixing device for fixing a balloon of a balloon infuser to a fixed shaft or a connector for continuously injecting a small amount of a drug solution into a blood vessel, a bladder, or the like.

[0002]

2. Description of the Related Art Balloons made of vulcanized rubber are mainly used for balloon infusers due to their pressure characteristics.
However, when these materials are bonded with a resin component such as a fixed shaft member or a connector member using a solvent or an adhesive,
There is almost no adhesive force, and the balloon cannot be held and fixed under the deflating pressure of the balloon. For this reason, balloon infusers are fixed using metal fittings or O-rings.However, in order to have a fixed fixing strength, these are applied to tubes with a set wall thickness. Correspondingly, the specifications of the fixture had to be determined, and generally the thickness tolerance of the balloon had to be tight.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention absorbs a change in the thickness of a balloon even if the thickness of the balloon changes, and securely fixes the balloon to a fixed shaft or connector with an appropriate crimping strength. It is an object to provide a balloon fixing device for use in such a device.

[0004]

According to a first aspect of the present invention, there is provided a balloon fixing device for use in a drug solution injecting pump which fills a drug solution into a drug solution balloon made of an elastic body and injects a small amount into the body by the contraction force of the balloon. The balloon fixing device is inserted into an end of a balloon formed in a tubular shape, has a distal end and a proximal end, and expands and fixes the end of the balloon in the radial direction on the distal end side. A fixed cylinder having a distal end and a base end, which is fitted to the outer periphery of the end portion of the balloon, and has a distal end and a proximal end, and which sandwiches the end of the balloon with the swaged projection of the inner crimped member. An outer caulking member having an outer caulking member, and the fixing cylinder of the outer caulking member is formed into a tapered cylindrical body whose inner diameter increases from the distal end toward the base end, and the axial direction of the inner caulking member inserted into the outer caulking member. Relative movement to Characterized in that it is possible to moderate the more caulking strength. The balloon fixing device of claim 2 is
The invention according to claim 1, wherein the outer caulking member and the inner caulking member are provided with a slip-off preventing mechanism for preventing slipping out of each other. According to a third aspect of the present invention, in the second aspect of the invention, the detachment preventing mechanism prevents the detachment in the axial direction by engaging the saw-shaped projection of the inner crimping member with the engaging claw of the outer crimping member. It is characterized by being. According to a fourth aspect of the present invention, in the balloon fixing device according to the second aspect, the detachment preventing mechanism prevents the detachment in the axial direction by screwing a male screw of the inner caulking member and an engaging claw of the outer caulking member. It is characterized by being.

According to the first aspect of the present invention, since the crimping projection of the inner crimping member can continuously change the insertion depth and the gap of the outer crimping member in the tapered fixed cylinder, the thickness of the end portion of the balloon is increased. Even if there is a change, the pressure can be absorbed and the pressure can be reliably reduced. Therefore, if the thickness of the tube is within a certain range, the tube can be fixed with an appropriate caulking strength. According to the second aspect of the present invention, once the outer caulking member and the inner caulking member are connected, the caulking strength can be maintained for a long period of time since the caulking strength is not maintained by the removal prevention mechanism. Reliability can be improved. According to the third aspect of the invention, when the engaging claw is engaged with the saw-shaped projection, the inner and outer caulking members can be reliably prevented from coming off. According to the invention of claim 4, when the engaging claw is screwed into the male screw, the swaging strength can be delicately adjusted only by screwing, and the inner and outer caulking members can be prevented from being pulled out freely. Can also be removed.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded cross-sectional view of a balloon fixing device according to an embodiment of the present invention. FIG. 2A is a cross-sectional view showing a state where the balloon fixing device of FIG. FIG. 4 is a cross-sectional view showing a state where the fixing bracket is connected to a thick balloon end portion. FIG. 3 is an exploded cross-sectional view of a balloon fixing apparatus according to another embodiment of the present invention.
3A is a cross-sectional view showing a state where the balloon fixing device of FIG. 3 is connected to a thin-walled balloon end, and FIG. 3B is a cross-sectional view showing a state where the fixing bracket is connected to a thick-walled balloon end. It is.

[0007] In Figs. 1 to 5, B is a balloon filled with a chemical solution, only one end of which is shown. This balloon is a member formed into a cylindrical shape by an elastic body such as rubber, and has a function of discharging a chemical solution by being filled with a medical solution and expanding in a balloon shape by the contraction force of the elastic body generated in the expanded state. Things. 1 to 5 show only the cylindrical end of such a balloon B. As shown in FIG.
The balloon fixing device A includes an inner caulking member 1 and an outer caulking member 2.
It is composed of The inner caulking member 1 is formed at an end of a fixed shaft or a connector, and the outer caulking member 2 is inserted and used at the end of the balloon B.

Next, the details of the balloon fixing device A will be described with reference to FIG. The inner caulking member 1 includes a glans-shaped insertion portion 11 and a cylindrical body 1 in order from the distal end to the proximal end.
2, a first caulking projection 13 having a larger outer diameter than the body 12 is formed between the insertion portion 11 and the body 12,
A second caulking projection 14 having an outer diameter larger than that of the body is formed at the root of 2. The first caulking projection 13 and the second caulking projection 14 correspond to the caulking projection described in the claims. Further, a saw-like projection 15 is formed on the base end side of the body 12. The saw-shaped projection 15 has a shape and an outer diameter that engage with an engagement claw 25 of the outer caulking member 2 described later.

The outer caulking member 2 is formed with a tapered fixed cylinder 21 and a connecting portion 22 having a larger diameter from the distal end toward the proximal end. The inner peripheral surface of the fixed cylinder 21 has a gentle taper from the distal end toward the proximal end.
An engagement claw 25 is formed inside the base end of the connecting portion 22. The engaging claw 25 is a member that engages with and engages with the saw-shaped protrusion 15 of the inner caulking member 1. This engaging claw 25 is not provided on the entire circumference of the connecting portion 22,
It is provided intermittently in the circumferential direction. That is, in the present embodiment, there are four places at equal intervals in the circumferential direction, and the connection part 22 also has four cavities 26 in the circumferential direction. The reason why the engaging claw 25 and the connecting portion 22 are provided intermittently in the circumferential direction is to allow a certain degree of bending and to enable the engagement with the saw-shaped protrusion 15 of the inner caulking member 1. . The engagement claw 25 and the saw-like projection 15 constitute a slip-off prevention mechanism.

Next, a method of using the balloon fixing device A will be described with reference to FIG. (A) shows a state in which the ends of the thin balloon B are connected. In this case, the first caulking projection 13 and the second caulking projection 14 are inserted into the fixed cylinder 21 to clamp the end of the thin balloon B at two places.
The engaging claw 25 is engaged behind the serrated projection 15.
(B) shows a state in which the ends of the thick balloon B are connected.
In this case, the first caulking projection 13 is inserted into the fixed cylinder 21 to press the end of the thick balloon B at one place. The second crimping projection 14 pushes the end of the balloon B outside the fixed cylinder 21. The engaging claw 25 is engaged in front of the serrated projection 15. Above thin-walled balloon B
Fig. (A) shows the combined state of the case of thick balloon B and
As shown in the figure (B), in the case of the tube having the above-mentioned intermediate thickness, the tube is caulked and connected in the state between the above-mentioned figures (A) and (B). Therefore, even if the thickness of the balloon B fluctuates, swaging can be performed with appropriate strength without fail, and once the connection is made by the connecting claw 25 and the saw-like projection 15, it does not come off.

Next, a balloon fixing device A according to another embodiment will be described with reference to FIG. In this embodiment, a male screw 16 is formed on the inner caulking member 1 instead of the saw-like projection 15. The male screw 16 and the engagement projection 25 constitute a detachment prevention mechanism. Other configurations are the same as those of the embodiment of FIG. 1, and therefore, the same portions are denoted by the same reference characters and description thereof will be omitted. When connecting the inner caulking member 1 and the outer caulking member 2, the tip of the inner caulking member 1 is inserted into the end of the balloon B in the outer caulking member 2, and the outer caulking member 2 is rotated to engage the engaging claw 25. May be screwed into the male screw 16. And when screwed until an appropriate crimping strength is obtained,
The swaging is completed. Also in this embodiment, as shown in FIGS. 4A and 4B, the balloon B can be securely caulked when the balloon B is thin or thick, and the inner caulking member 1 and the outer caulking member are also provided. Once you have joined the two, you won't get out on your own. Moreover, when the outer caulking member 2 is rotated, the outer caulking member 2 is loosened with respect to the male screw 16 and can be artificially removed.

Next, another embodiment of the present invention will be described with reference to the drawings. In the above embodiment, the inner caulking member 1 has 2
Although the crimping projections 13 and 14 are provided, the number of the crimping projections may be one or three or more depending on the case. In the above embodiment, four engaging claws 25 and cavities 26 are formed in the outer caulking member 2 in the circumferential direction.
This may be three or two places, and may be five or more places.

[0013]

According to the first aspect of the present invention, even if there is a change in the thickness of the end portion of the balloon, the change can be absorbed and the pressure can be reduced reliably, and the balloon can be fixed with an appropriate caulking strength. . According to the second aspect of the present invention, once the outer caulking member and the inner caulking member are connected, the caulking strength can be maintained at the same level for a long time because the caulking strength is prevented by the removal prevention mechanism. According to the third aspect of the invention, when the engaging claw is engaged with the saw-shaped projection, the inner and outer caulking members can be reliably prevented from coming off. According to the invention of claim 4, when the engaging claw is screwed into the male screw, the swaging strength can be delicately adjusted only by screwing, and the inner and outer caulking members can be prevented from being pulled out freely. Can also be removed.

[Brief description of the drawings]

FIG. 1 is an exploded sectional view of a balloon fixing device according to an embodiment of the present invention.

2 (A) is a cross-sectional view showing a state where the balloon fixing device of FIG. 1 is connected to a thin-walled balloon end, and FIG. 2 (B) is a view showing a state where the fixing metal fitting is connected to a thick-walled balloon end. FIG.

FIG. 3 is an exploded sectional view of a balloon fixing device according to another embodiment of the present invention.

4A is a cross-sectional view showing a state where the balloon fixing device of FIG. 3 is connected to a thin-walled balloon end, and FIG. 4B is a cross-sectional view showing a state where the fixing device is connected to a thick-walled balloon end. FIG.

[Explanation of symbols]

 Reference Signs List A balloon fixing tool B balloon 1 inner caulking member 2 outer caulking member 11 insertion section 13 first caulking projection 14 second caulking projection 15 saw-like projection 16 male screw 25 engaging claw

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takeshi Mori 3-9-3 Honjo Nishi, Kita-ku, Osaka-shi, Osaka F-term in Nissho Corporation (reference) 4C066 AA09 BB01 CC01 DD13 EE03 FF03 HH30 JJ07

Claims (4)

[Claims] 1. A balloon fixing device used for a drug solution injection pump for filling a drug solution balloon made of an elastic body with a drug solution and injecting a small amount into the body by the contraction force of the balloon, wherein the balloon fixing device is formed in a tubular shape. An inner caulking member having a distal end and a proximal end, and a caulking projection provided on the distal end side for radially expanding and fixing the end of the balloon; and a balloon. An outer caulking member having a distal end and a proximal end, and having a fixed cylinder that sandwiches the end of the balloon with the caulking protrusion of the inner caulking member. The fixed cylinder is formed into a tapered cylindrical body whose inner diameter increases from the distal end to the proximal end, and the crimping strength can be adjusted by relative movement in the axial direction of the inner crimping member inserted into the outer crimping member. To Balloon fixture and butterflies. 2. The outer caulking member and the inner caulking member,
2. The balloon fixing device according to claim 1, further comprising a detachment prevention mechanism for preventing mutual detachment. 3. The detachment preventing mechanism is a mechanism for preventing detachment in the axial direction by engaging a saw-shaped projection of an inner crimping member with an engagement claw of an outer crimping member.
The balloon fixture as described. 4. A mechanism according to claim 2, wherein said detachment preventing mechanism is a mechanism for preventing detachment in an axial direction by screwing a male screw of an inner caulking member and an engagement claw of an outer caulking member. Balloon fixture.