JP4794258B2 - Balloon mounting device - Google Patents

Description

  The present invention relates to a balloon mounting device for mounting a balloon at a predetermined position on the outer peripheral portion of an axial insertion member constituting an endoscope, an ultrasonic probe, or the like, and in particular, a cylinder between a pair of fastening portions. The present invention relates to a balloon mounting apparatus in which a balloon provided with a flexible film is mounted so that each fastening portion is engaged with a mounting portion on an outer peripheral surface of a shaft-like insertion member.

  In a body cavity inspection apparatus having an axial insertion member inserted into a body cavity, that is, an insertion section, such as an endoscope, an ultrasound endoscope, an intracorporeal ultrasound probe, etc., the distal end or distal end of the insertion section A device in which a balloon is attached in the vicinity has been widely known.

  A balloon attached to an endoscope is used, for example, for inserting an insertion portion of an endoscope into a body cavity tube and holding the insertion portion fixedly at a predetermined position. That is, the balloon is inflated by supplying a fluid made of gas or liquid into the balloon, and the insertion portion is fixed so as to press the outer surface of the balloon against the inner wall of the body cavity. Therefore, the balloon is mounted on the proximal end side of the portion where the endoscope observation means is provided in the insertion portion and in a position close to the endoscope observation means. In addition, a cylindrical guide member may be used to guide the endoscope. This guide member is also a hollow shaft-like insertion member, and a balloon is mounted near the tip of the guide member. is there. On the other hand, in an ultrasonic inspection apparatus, that is, an ultrasonic endoscope or an intracorporeal ultrasonic probe, an ultrasonic signal transmitted and received by an ultrasonic transducer is transmitted to the insertion portion when performing an ultrasonic inspection. A balloon is mounted to suppress the attenuation as much as possible. Therefore, the balloon is mounted so as to surround the site where the ultrasonic transducer is mounted, and when performing an ultrasonic inspection, an ultrasonic transmission medium is supplied into the balloon to bulge it, and the balloon surface is It is made to contact | abut to a body cavity inner wall.

  As a balloon, when it is attached to an endoscope, it is necessary to prevent the endoscope observation means from being covered with the balloon. Mount on the base end side from the mounting part of the means. On the other hand, the balloon to be attached to the ultrasonic inspection apparatus only needs to cover the position where the ultrasonic transducer is attached. For this purpose, the balloon is not limited to a cylindrical shape but may be a bag-like shape. However, since the shape of the bag-shaped balloon is not stable when an ultrasonic transmission medium is supplied and inflated, it is common to use a cylindrical one like a balloon attached to an endoscope. Is.

  Since the balloon is inflated by supplying a fluid to the inside of the balloon, it must be prevented from airtight leakage. For this reason, both end portions of the balloon are mounted so as to be tightened with respect to the insertion portion, so that they are not separated from the outer surface of the insertion portion even if the inside becomes high pressure. For this purpose, at least both ends of the balloon are used as fastening parts, and the diameter of this fastening part is made sufficiently smaller than the outer diameter dimension of the insertion part to which it is attached, and is brought into pressure contact with the outer surface of the insertion part, And it is set as the strip | belt-shaped fastening part which widened the width | variety of this fastening part. In addition, a pair of annular fastening grooves are formed on the outer peripheral surface of the insertion portion as front and rear as balloon attachment portions, ring attachment portions are provided at both ends of the balloon, and these ring attachment portions are inserted. Some are fixed so as to be fitted in the fastening grooves of the part. Even when the ring-shaped fastening portion is used, the inner diameter thereof is sufficiently smaller than the diameter of the bottom portion of the fastening groove.

  Whether it is a belt-like fastening part or a ring-like fastening part, it cannot be attached to the insertion part unless at least these fastening parts are expanded in diameter. In addition, since the distance from the distal end of the anchoring portion at the proximal end side in the balloon insertion portion is increased, it is extremely difficult to operate the balloon end to the position. For this reason, a device or jig for mounting a balloon has been used conventionally.

  For example, in Patent Document 1, a foldable cylindrical jig is used to mount the balloon on the proximal end side of the insertion portion, and this jig has a claw for expanding the end portion of the balloon. The cylindrical portion is provided with an inner diameter that can be fitted to the insertion portion.

Patent Document 2 discloses a balloon mounting device including a cylindrical body having an inner surface through which an outer surface becomes a sliding surface and an insertion portion is inserted. This balloon mounting device uses the good sliding property of the sliding surface to fit the balloon into the cylinder, and then inserts the insertion portion into the cylinder and is fixed to the distal end side of the insertion portion. When the part to be moved is located at the end of the cylinder, one end of the balloon is moved to the outer surface of the insertion part, and the insertion part is further inserted into the cylinder, and the fastening part on the base end side is the cylinder. When the end of the balloon is reached, the other end of the balloon is detached so as to fit into the insertion portion.
JP 2005-137413 A JP-A-8-182678

  By the way, since the insertion portion of the endoscope, the ultrasonic endoscope or the in-body type ultrasonic probe is inserted into the body cavity, the balloon attached to the distal end portion of the insertion portion or the vicinity thereof is substantially It is desirable that the attachment is made so as to be in close contact with the outer surface of the insertion portion, so that the attached balloon is not loosened or wrinkled. For this reason, the cylindrical flexible membrane of the balloon also has an inner diameter that is substantially the same as or slightly smaller than the outer diameter of the insertion portion. Therefore, in the configuration of Patent Document 1, since the fastening portion fitted to the jig is larger than the outer diameter of the insertion portion, it can be smoothly moved along the outer peripheral surface of the insertion portion. Since the flexible film is mounted so as to slide on the outer peripheral surface of the insertion portion, the operation of mounting the entire balloon is difficult. In Patent Document 2, in order to attach the cylindrical flexible membrane to the outer surface of the cylindrical body, the sliding surface must also slide with respect to the outer surface of the cylindrical body. Even if it is a surface, it is still a difficult task.

  The present invention has been made in view of the above points. The object of the present invention is to expand the fastening portions at both ends of the balloon and to engage with the outer cylinder and the inner cylinder, and to form the cylinder. An object of the present invention is to make it possible to attach the flexible membrane without substantially sliding on the insertion portion to which the flexible membrane is attached, the mounting cylinder, or the like.

  In order to achieve the above-described object, the present invention provides a balloon in which fastening portions are provided at both ends, and a portion between these fastening portions is a cylindrical flexible membrane, and both fastening portions are inserted axially. A device for mounting on the outer peripheral surface of a member that is positioned on the front and rear of the member in the axial direction, a cylindrical outer cylinder having an open end, and the axial direction in the outer cylinder An inner cylinder in which the tip of the shaft-like insertion member can be inserted, and an inner cylinder connected to the inner cylinder, the inner cylinder being moved in the axial direction within the outer cylinder And a first holding portion on one end of the balloon that is engaged with the outer peripheral surface of the outer cylinder, and the other end of the balloon on the outer peripheral surface of the inner cylinder. A second holding portion to which the attachment portion is engaged is provided, and the inner cylinder is connected to the outer cylinder. In a state in which the distal end of the shaft-shaped insertion member is inserted from the position where the second holding portion provided on the outer tube protrudes from the distal end of the outer cylinder, the attachment portion on the proximal end side of the shaft-shaped insertion member is the first It is characterized in that it can be reciprocated as a stroke range that reaches the position facing the holding portion or the position where it enters the outer cylinder.

  Examples of the shaft-like insertion member to which the balloon is attached include an insertion portion of an endoscope or an ultrasonic endoscope, and an intracorporeal insertion type ultrasonic probe. Furthermore, a balloon may be attached to a cylindrical guide member into which an insertion portion of an endoscope or the like is inserted. The balloons attached to these shaft-like insertion members have a cylindrical flexible membrane and have a fastening part at both ends thereof. As this fastening part, a belt-like fastening part or a ring-like fastening part is used. Configured as a landing part. If the belt-like fastening part is used, it is not necessary to perform special processing on the outer surface of the shaft-like insertion member, and if the ring-like fastening part is used, the balloon can be made more stable in the mounted state.

  When the inner cylinder is pulled into the outer cylinder by a predetermined amount or more with the fastening parts at both ends of the balloon having the above structure engaged with the first and second holding parts, tension acts on the cylindrical flexible film. To do. Since the diameters of the first and second holding portions are larger than the outer diameter of the shaft-shaped insertion member, the tubular flexible membrane is also larger than the outer diameter of the shaft-shaped insertion member. The cylindrical flexible membrane can be smoothly inserted into the inner cylinder from the inner side in a non-contact state.

  The inner cylinder is a piston part whose base end slides on the inner cylinder surface, and at least the outer peripheral surface of the portion where the second holding part is provided has a smaller diameter than the inner cylinder surface of the outer cylinder. When configured so that an annular gap is formed, the gap is hermetically sealed when both ends of the balloon are engaged with the first and second holding portions. Therefore, when the inner cylinder is further drawn into the outer cylinder, this gap is expanded, and a negative pressure is applied to the inside. As a result, the cylindrical flexible membrane of the balloon is in close contact with the inner surface of the outer cylinder. Since the inner diameter of the outer cylinder is larger than the outer diameter of the shaft-shaped insertion member, the shaft-shaped insertion member can be fitted into the inner cylinder in a non-contact state with the tubular flexible film.

  Insert the tip of the shaft-shaped insertion member into the inner cylinder by applying tension to the cylindrical flexible membrane with the fastening part expanded in diameter, or by bringing it into close contact with the inner peripheral surface of the outer cylinder by the action of negative pressure After that, when the proximal end portion of the balloon mounting portion of the shaft-like insertion member is at a position facing the end of the outer cylinder, the fastening portion is detached from the first holding portion, Attached to the outer peripheral surface of the shaft-like insertion member. Next, the inner cylinder can be pushed out to a state protruding from the tip of the outer cylinder, the fastening portion can be detached from the second holding portion, and can be attached to the outer peripheral surface of the shaft-like insertion member.

  In the first and second holding portions, it is necessary to hold the fastening portions at both ends of the balloon in a stable state. However, in the case of a belt-like fastening portion, there is a friction surface, and this friction surface includes the outer cylinder and It is formed in an annular shape having substantially the same width as the width of the belt-like fastening portion on the outer peripheral surface on the tip side of the inner cylinder. On the other hand, in the case of a ring-shaped fastening part, the holding part can be constituted by a protrusion or groove formed circumferentially on the outer peripheral surface of the outer cylinder and the inner cylinder.

  When a balloon is attached to form a sealed annular gap between the outer cylinder and the inner cylinder, and when the operating cylinder is operated and the inner cylinder is retracted, this sealed space is made negative. When the pulling stroke of the inner cylinder by the operating member becomes long, the pressure in the sealed annular gap is remarkably lowered, and the cylindrical flexible membrane of the balloon is drawn toward the gap. In order to prevent the tubular flexible membrane from being drawn from the second holding portion toward the proximal end side, a pressure adjusting means can be provided. As the pressure adjusting means, for example, a through hole may be formed in the inner cylindrical portion of the inner cylinder, and a flexible partition made of an elastic member may be provided in the through hole.

  By configuring as described above, the cylindrical flexible membrane of the balloon can be expanded at least beyond the outer diameter of the shaft-shaped insertion member, and the shaft-shaped insertion member can be inserted without sliding on the balloon. Therefore, the shaft-like insertion member can be mounted smoothly and quickly.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an insertion portion 1 of a body cavity insertion type ultrasonic probe as an example of a shaft-like insertion member. As is clear from the figure, the insertion portion 1 is a circular and thin long member, and the ultrasonic transducer 2 is provided near the tip. In the insertion portion 1, a pair of fastening grooves 3 a and 3 b formed in an annular shape are provided as attachment portions of the balloon 10 at positions before and after the attachment portion of the ultrasonic transducer 2. Further, an outlet 4 for an ultrasonic transmission medium is formed at a position between the fastening groove 3 a on the proximal end side and the ultrasonic transducer 2.

  The balloon 10 is formed between ring-shaped fastening portions 11, 11 as fastening portions to be attached to the fastening grooves 3 a, 3 b on the distal end side and the proximal end side, and between these ring-shaped fastening portions 11. It is comprised from the cylindrical flexible film 12. FIG. Both the ring-shaped fastening portions 11 are attached to the fastening grooves 3a and 3b of the insertion portion 1, and the ultrasonic flexible medium 12 is supplied from the outlet 4 so that the tubular flexible membrane 12 is swelled. The tubular flexible membrane 12 thus bulged can be held in contact with the inner wall of the body cavity so that no air layer is interposed in the ultrasound transmission / reception path from the ultrasound transducer 2 to the body.

  When the balloon 10 is attached to the insertion portion 1, the balloon 10 is brought into close contact with the outer peripheral surface of the insertion portion 1, and when the ultrasonic transmission medium is supplied into the balloon 10, the ultrasonic transmission medium does not flow out. Need to be sealed. For this reason, the ring-shaped fastening part 11 has a diameter in a free state sufficiently smaller than the diameter of the groove bottom part of the fastening grooves 3a and 3b. Further, the diameter of the tubular flexible membrane 12 in the free state is approximately the same as or slightly smaller than the outer diameter of the insertion portion 1, so that the tubular shape is attached to the insertion portion 1. The slack and wrinkles are prevented from occurring in the flexible film 12.

  In order to attach the balloon 10 to the insertion portion 1, the balloon attaching device shown in FIG. 2 is used. In the figure, 20 is an outer cylinder, 21 is an inner cylinder provided in the outer cylinder 20 so as to be movable in the axial direction, and these outer cylinder 20 and inner cylinder 21 are preferably made of metal such as stainless steel. It is made of material. The outer cylinder 20 has a configuration in which an annular end wall 23 is provided at the base end portion of a thin outer cylindrical portion 22 having an open end.

  Further, the inner cylinder 21 has an inner cylindrical portion 24 having an open front end, and a disc-shaped piston portion 25 connected to the base end portion of the inner cylindrical portion 24. The proximal end side of the inner cylinder 21 is closed. The outer diameter of the inner cylindrical portion 24 is smaller than the outer diameter of the piston portion 25, and a step is formed therebetween. The piston portion 25 slides along the inner peripheral surface of the outer cylindrical portion 22, and the sliding portion has an airtight structure by the seal ring 26. On the other hand, the inner cylindrical portion 24 is formed with an annular gap 27 (see FIG. 3) with respect to the inner surface of the outer cylindrical portion 22.

  An inner peripheral side of the inner cylindrical portion 24 is an insertion portion receiving portion 28 having a large diameter on the distal end side, and a small-diameter pressure regulating chamber 29 is formed on the back side from the insertion portion receiving portion 28. . One or a plurality of through holes 30 that open to the position of the pressure adjusting chamber 29 are provided in the peripheral body portion of the inner cylindrical portion 24, and a flexible partition wall 31 is attached to the through hole 30. In the case where the inner cylinder 21 is not provided with a pressure adjusting chamber, the length of the inner cylinder 21 can be shortened by the length of the pressure adjusting chamber in the axial direction.

  An operation rod 32 as an operation means is connected to the proximal end portion of the inner cylinder 21, that is, the piston portion 25. The operation rod 32 extends through the annular end wall 23 that constitutes the outer cylinder 20, and a knob 32 a is provided at the base end portion thereof. The inner cylinder 21 reciprocates in the axial direction within the outer cylinder 20. In order to smoothly perform the pushing and pulling operation of the inner cylinder 21, one or a plurality of vent holes 33 communicating with the outside are provided at a transition portion from the outer cylindrical portion 22 to the end wall 23.

  The insertion portion receiving portion 28 provided in the inner cylinder 21 is for inserting the distal end portion of the insertion portion 1, and the insertion depth of the insertion portion 1 into the insertion portion receiving portion 28 is the distal end of the insertion portion 1. To the fastening groove 3a. Further, the inner diameter of the insertion portion receiving portion 28 of the inner cylinder 21 is slightly larger than the outer diameter of the insertion portion 1, so that the insertion portion 1 can be stably held in a state of being connected to the balloon mounting device. I am doing so.

  As shown in FIG. 3, a first holding portion 34 is provided on the outer peripheral surface of the distal end portion of the outer cylindrical portion 22 constituting the outer cylinder 20, and the outer periphery of the distal end portion of the inner cylindrical portion 24 of the inner cylinder 21. A second holding portion 35 is provided on the surface. These first and second holding portions 34 and 35 are for mounting and holding the ring-shaped fastening portion 11 in the balloon 10. Here, the first holding portion 34 is constituted by an annular ridge provided on the outer peripheral surface of the distal end of the outer cylindrical portion 22. On the other hand, the second holding portion 35 is formed by an annular groove having a V-shaped cross section formed on the outer peripheral surface of the distal end portion of the inner cylindrical portion 24. Here, the first and second holding portions 34 and 35 are not necessarily configured as described above. That is, by forming the first holding portion 34 with an annular ridge, the thickness of the outer cylindrical portion 22 of the outer cylinder 20 can be reduced, and the second holding portion 35 is formed by an annular groove. By doing so, although the thickness of the inner cylindrical portion 24 of the inner cylinder 21 is somewhat increased, the difference in diameter between the outer peripheral surface of the inner cylindrical portion 24 and the inner peripheral surface of the outer cylindrical portion 22 can be reduced. As a result, the diameters of the first and second holding portions 34 and 35 can be reduced, and the ring-shaped fastening portion 11 can be easily attached.

  By operating the operation rod 32, the inner cylinder 21 can be moved in the axial direction of the outer cylinder 20. The movement stroke of the inner cylinder 21 is at least in the direction in which the second holding portion 35 protrudes from the tip of the outer cylinder 20 to the outside in the direction protruding from the outer cylinder 20, in the direction in which the inner cylinder 21 is retracted. When the insertion portion 1 is inserted into the insertion portion receiving portion 28 of the inner cylinder 21, the fastening groove 3 b on the proximal end side of the insertion portion 1 is substantially at the same position as the first holding portion 34 of the outer cylinder 20, or Further, the position reaches the position inside the outer cylinder 20. The moving stroke of the inner cylinder 21 depends on the length of the outer cylinder 20 in the axial direction. The moving stroke range is set by the length of the operation rod 32. That is, the position where the knob 32 a provided at the end of the operating rod 32 contacts the end wall 23 of the outer cylinder 20 is the stroke end in the protruding direction of the inner cylinder 21, and the end of the inner cylinder 21 is the end wall 23. The position in contact with the stroke is the stroke end of the inner cylinder 21 in the retracting direction.

  Then, the ring-shaped fastening part 11 of the balloon 10 can be engaged with the second holding part 35 provided on the inner cylinder 21 and can be moved in the axial direction of the outer cylinder 20. The width of the gap 27 is set so that the fixed fastening portion 11 and the cylindrical flexible film 12 do not come into contact with the inner surface of the outer cylinder 20.

  Therefore, a method for mounting the balloon 10 on the insertion portion 1 using the balloon mounting apparatus will be described with reference to FIG.

  First, as shown in FIG. 4A, the operation rod 32 is operated so that the inner cylinder 21 is pushed out from the tip of the outer cylinder 20. In the figure, the inner cylindrical portion 24 in the inner cylinder 21 completely protrudes from the outer cylinder 20, but the second holding portion 35 only needs to protrude outside, and the entire inner cylindrical portion 24 necessarily protrudes. There is no need. In this state, the diameter of one ring-shaped fastening portion 11 of the balloon 10 is increased and the second holding portion 35 is engaged.

  Next, the inner cylinder 21 is operated to be pulled into the outer cylinder 20. However, the inner cylinder 21 is not moved to the stroke end position in the retracting direction into the outer cylinder 20, but substantially corresponds to the length of the balloon 10 in the free state, as shown in FIG. The other ring-shaped fastening part 11 is engaged with the first holding part 34 provided on the outer cylinder 20. As a result, a sealed space defined by the gap 27 and the balloon 10 is formed between the inner cylinder 21 and the outer cylinder 20 on the distal end side of the piston portion 25.

  Therefore, the operation rod 32 is further operated to move the inner cylinder 21 to the stroke end position. As a result, as shown in FIG. 4 (c), the volume of the sealed space is enlarged, so that the inside of the sealed space becomes negative pressure, and the cylindrical flexible membrane 12 of the balloon 10 becomes the inner surface of the outer cylinder 20. Will be in close contact. Since the outer diameter of the outer cylinder 20 is sufficiently smaller than the outer diameter of the insertion section 1, as shown in FIG. 4 (d), the insertion section 1 can be easily connected to the cylindrical flexible membrane 12 and Can be inserted into the insertion portion receiving portion 28 formed in the inner cylindrical portion 24 of the inner cylinder 21 in a non-contact state. And by inserting the insertion part 1 into the insertion part receiving part 28, the axial center of this insertion part 1 is aligned with the axial center of the outer cylinder 20 and the inner cylinder 21 which comprise a balloon mounting apparatus. Become.

  As is apparent from FIG. 4D, when the inner cylinder 21 is at the retracting stroke end position with respect to the outer cylinder 20, the insertion portion 1 held by the insertion portion receiving portion 28 of the inner cylinder 21 is located on the proximal end side. The fixing groove 3b is substantially at the same position as the first holding portion 34 in the outer cylinder 20. Therefore, the ring-shaped fastening portion 11 that is engaged with the first holding portion 34 is detached and moved to the fastening groove 3 b of the insertion portion 1.

  Next, the inner cylinder 21 is operated to be pushed out from the outer cylinder 20. Then, when the inner cylinder 21 is displaced in a direction in which the inner cylinder 21 protrudes from the outer cylinder 20, the ring-shaped fastening part 11 of the balloon 10 fitted to the fastening part 3b is pushed out, and the cylindrical flexible film 12 is inserted into the insertion part. 1 is surrounded. Then, as shown in FIG. 4 (e), when the second holding portion 35 provided on the inner cylinder 21 protrudes from the tip of the outer cylinder 20, the balloon 10 engaged with the second holding portion 35. The ring-shaped fastening part 11 is detached and moved to the fastening groove 3 a of the insertion part 1. As a result, the balloon 10 is attached to the insertion portion 1.

  In this way, the ring-shaped fastening part 11 of the balloon 10 is expanded and engaged with the first and second holding parts 34, 35, and the inner cylinder 21 is moved, so that these ring-like fastenings are obtained. The cylindrical flexible membrane 12 as well as the portion 11 can be attached to the insertion portion 1 in a substantially non-contact state with respect to the insertion portion 1. That is, since the entire balloon 10 can be mounted without sliding with the balloon mounting apparatus or the insertion portion 1, the operability is improved, and the balloon 10 is smoothly and yet damaged. Can be installed without letting

  Here, the pressure regulating chamber 29 having the flexible partition wall 31 is provided in the inner cylinder 21 because the ring-shaped fastening part 11 of the balloon 10 is engaged with the first holding part 34, After the sealed space formed by the balloon 10 and the outer cylinder 20 is formed, the length in which the inner cylinder 21 is further drawn is not constant. Therefore, if the stroke in which the inner cylinder 21 is drawn becomes longer after the sealed space is formed, this sealed space causes a pressure drop more than necessary. At this time, the flexible partition wall 31 bulges out toward the sealed space, so that the pressure in the sealed space is extremely reduced and the balloon 10 is prevented from entering the gap 27 between the outer cylinder 20 and the inner cylinder 21. It is to do. Therefore, if the retracting stroke of the inner cylinder 21 is substantially constant after the sealed space is formed, it is not necessary to provide the through hole 30 and provide the pressure regulating chamber 29 to which the flexible partition wall 31 is attached.

  Further, the balloon has been described as having a ring-like fastening portion as a fastening portion at both ends, but the balloon 40 shown in FIG. 5 can also be used. That is, the balloon 40 has a band-like fastening portion 41 at both ends, and a portion between the two belt-like fastening portions 41 is a cylindrical flexible film 42. In this case, the first and second holding portions 43 and 44 formed on the outer cylinder 20 and the inner cylinder 21 are portions having a large friction coefficient and are frictionally engaged with the belt-like fastening portion 41. . Other configurations and operations are not different from the first embodiment described above.

It is composition explanatory drawing which shows the state which attached the balloon to the insertion part and swelled. It is sectional drawing which shows the structure of the balloon mounting apparatus which concerns on this invention. It is a principal part enlarged view which shows the structure of a 1st, 2nd holding | maintenance part. It is effect | action explanatory drawing which shows the procedure which mounts | wears a balloon with an insertion part using the balloon mounting apparatus of FIG. It is a structure explanatory drawing which shows the structure of a different type balloon and its mounting apparatus from 1st Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 10,40 Balloon 11 Ring-shaped fastening part 12,42 Cylindrical flexible membrane 20 Outer cylinder 21 Inner cylinder 22 Outer cylindrical part 23 End wall 24 Inner cylindrical part 25 Piston part 27 Gap 28 Insertion part receiving part 29 Adjustment Pressure chamber 30 Through-hole 31 Flexible partition wall 32 Operating rods 34, 43 First holding portion 35, 44 Second holding portion 41 Band-shaped fastening portion

Claims (4)

Fastening parts are provided at both ends, and a balloon having a cylindrical flexible membrane between the two fastening parts is positioned at the attachment part where the both fastening parts are arranged in the axial direction of the axial insertion member. And a device for mounting on the outer peripheral surface,
A cylindrical outer cylinder with an open end;
An inner cylinder that is movably disposed in the axial direction in the outer cylinder and into which the tip of the shaft-shaped insertion member can be inserted;
It is connected to the inner cylinder, and comprises an operating means for moving the inner cylinder in the outer cylinder in the axial direction,
A first holding portion is provided on the outer peripheral surface of the outer cylinder at one end of the balloon, and the other fixing portion of the balloon is engaged on the outer peripheral surface of the inner cylinder. A second holding part is provided,
The inner cylinder is inserted into the outer cylinder in a state where the distal end of the shaft-shaped insertion member is inserted from a position where a second holding portion provided on the inner cylinder protrudes from the distal end of the outer cylinder. A balloon characterized in that it can be reciprocated as a stroke range that reaches a position where the attachment portion on the proximal end side of the cylindrical insertion member faces the first holding portion or a position where the attachment portion enters the outer cylinder. Mounting device. The inner cylinder is a piston portion whose base end side slides on the inner peripheral surface of the outer cylinder, and at least the outer peripheral surface of the portion where the second holding portion is provided has a smaller diameter than the inner peripheral surface of the outer cylinder. Thus, an annular gap is formed between them, and when both ends of the balloon are engaged with the first and second holding portions, the gap is sealed, and in this state, the inner gap is sealed. 2. The balloon mounting device according to claim 1, wherein a negative pressure is applied to the sealed space by drawing the tube into the outer tube. The inner cylinder is provided with one or a plurality of through holes in an inner cylindrical portion thereof, and the through holes are provided with pressure adjusting means formed by mounting a flexible partition wall. Item 3. A balloon mounting device according to Item 2. The fastening portions at both ends of the balloon are both formed by ring-like fastening portions, and the mounting portions on the outer peripheral surface of the shaft-like insertion member are the distal end side and the proximal end side where these ring-like fastening portions are fitted. And the first holding portion includes a ring-shaped fastening portion that is mounted on the annular groove on the proximal end side of the shaft-like insertion member among the ring-shaped fastening portions. The second holding portion holds the ring-shaped fastening portion mounted in the annular groove on the distal end side of the shaft-like insertion member so as to be detachable. The balloon mounting device according to claim 1.

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