JP2007244682A - Balloon catheter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a balloon catheter capable of placing a balloon in the inflated state inside the body cavity. <P>SOLUTION: The balloon catheter is composed of a balloon member 1 to which a balloon part 12 and a valve element 15 are integrally attached, a tubular catheter body 2 to detachably attach the balloon member 1 to the distal end with the valve element 15 in the opened state, a connection part 2a integrally attached to the distal end of the catheter body 2, and an outer barrel 3 fitted to the catheter body 2. The connection part 2a is composed of a locking piece 23 to be detachably locked to a locking hole 13 formed at the proximal end of the balloon member 1 and a resilient member to energize the catheter body 2 in the direction of separating from the balloon member 1 with the locking piece 23 locked with the locking hole 13 of the balloon member 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is used by being inserted into a living body for examinations and treatments. The state of the stenosis is expanded for a long time after smooth expansion of a stenosis, occlusion of a hole formed in a living body cavity, tissue peeling, etc. The present invention relates to a balloon catheter that can be stably maintained throughout.

  Today, minimally invasive treatment methods using catheters and endoscopes are widely used, and various balloon catheters are used for the purpose of dilating stenosis of living cavities such as blood vessels, trachea, and gastrointestinal tract, and tissue detachment. Proposed and used.

  And, specifically, the balloon catheter is used to expand the stenosis of the blood vessel by inserting it into the blood vessel and expanding the balloon part of the balloon member in order to treat the stenosis in the blood vessel, In a surgical method for closing a hole formed in a blood vessel, a balloon catheter is introduced to a position where the hole is generated in the blood vessel, and the balloon portion of the balloon member is expanded to close the hole of the blood vessel. Alternatively, a balloon catheter is introduced into a living body cavity endoscopically and used for diagnosis and treatment of expansion of a stenosis or tissue detachment.

  Further, as a kind of such a balloon catheter, the balloon member with the balloon portion inflated is separated from the outer cylinder and is left in the living body cavity, and the separated balloon member can be used to expand the constricted portion of the living body cavity. A balloon catheter capable of maintaining the closed state of the living body cavity for a long time has been proposed. Particularly, in the treatment using an endoscope, the balloon member is in a state where the balloon portion is inflated, It is possible to introduce another device into the forceps channel, which is very useful in that the range of diagnosis and treatment is expanded.

  As such a balloon catheter, in Patent Document 1, a balloon catheter having an in-vivo indwelling member at the tip thereof, a portion to be melted at or near the joint portion between the in-vivo indwelling member and the outer tube, and A balloon catheter provided with a heating means for fusing a portion has been proposed.

  However, the balloon catheter requires an electrode and a high-frequency current generator as its heating means, and the structure of the balloon catheter is not only complicated, but also the work of separating the in-vivo indwelling member from the outer cylinder is complicated. There was a problem.

Japanese Patent Publication No. 60-30225

  The present invention is used by being inserted into a living body cavity for examinations and treatments, and can smoothly expand a stenosis, block a hole formed in the living body cavity, peel tissue, and the like. Provided is a balloon catheter that can stably maintain an expanded state of a stenosis or a closed state of a living body cavity by being placed in a living body cavity while maintaining an expanded state.

  The balloon catheter of the present invention includes a balloon member that is integrally provided with a balloon portion that can be inflated and deflated, and that is integrally provided with a valve body for preventing the fluid supplied into the balloon portion from flowing out. A tubular catheter body that is detachably connected to the distal end portion in a state where the valve body is opened, and a connection portion that is integrally provided at the distal end portion of the catheter body, and is integrated with the distal end portion of the catheter body. And a catheter spring body provided integrally with the spring support body so as to be raised and lowered and detachably engaged with a locking hole formed in a base end portion of the balloon member. And a locking piece that integrates the balloon member, and the catheter in a state of being wound around the spring support and the locking piece being locked in the locking hole of the balloon member. A connection portion having a coil spring for urging the body in a direction away from the balloon member; and a engagement between the engagement piece of the connection portion and the engagement hole of the connection portion that is fitted to the catheter body. An outer cylinder that releases the stopped state is provided.

  In the balloon catheter, a locking claw protruding from the inner surface of the distal end of the locking piece and detachably locked in the locking hole of the balloon member, and protruding from the inner peripheral surface of the outer tube, and The outer tube is displaced in the proximal direction relative to the catheter body to press the proximal end of the locking piece, and the locking claw of the locking piece and the balloon member are locked. An annular projecting portion for releasing the locking state with the hole is provided.

  Further, the balloon catheter is provided with a stopper projecting on the outer surface of the base end of the locking piece and preventing the annular projecting portion of the outer cylinder from falling off the locking piece. Features.

  Furthermore, the balloon catheter is characterized in that the distal end portion of the spring support is inserted into the proximal end portion of the balloon member in a state where the catheter body and the balloon member are connected and integrated.

  The balloon catheter includes a regulating piece that is detachably disposed at the proximal end portion of the catheter main body and prevents the outer tube from moving toward the proximal end relative to the catheter main body. Features.

  The balloon catheter of the present invention includes a balloon member that is integrally provided with a balloon portion that can be inflated and deflated, and that is integrally provided with a valve body for preventing the fluid supplied into the balloon portion from flowing out. A tubular catheter body that is detachably connected to the distal end portion in a state where the valve body is opened, and a connection portion that is integrally provided at the distal end portion of the catheter body, and is integrated with the distal end portion of the catheter body. And a catheter spring body provided integrally with the spring support body so as to be raised and lowered and detachably engaged with a locking hole formed in a base end portion of the balloon member. And a locking piece that integrates the balloon member, and the catheter in a state of being wound around the spring support and the locking piece being locked in the locking hole of the balloon member. A connection portion having a coil spring for urging the body in a direction away from the balloon member; and a engagement between the engagement piece of the connection portion and the engagement hole of the connection portion that is fitted to the catheter body. And an outer tube that releases the stop state, so that the inflated state of the balloon portion can be stably maintained even after being detached from the catheter body, and the stenosis portion in the living body cavity can be maintained. The expanded state, the closed state of the hole generated in the living body cavity, or the closed state of the living body cavity can be stably maintained for a long time, and the diagnosis and treatment of the living body can be performed smoothly.

  The balloon member and the catheter main body are detachably and reliably integrated by detachably engaging the locking piece of the catheter main body with the locking hole of the balloon member, while the locking piece and the balloon member When the locking state with the locking hole is released, the balloon member and the catheter body can be reliably separated by the elastic repulsive force of the coil spring, and the balloon member can be reliably detached from the distal end of the catheter body.

  In the balloon catheter, a locking claw protruding from the inner surface of the distal end of the locking piece and detachably locked in the locking hole of the balloon member, and protruding from the inner peripheral surface of the outer tube, and The outer tube is displaced in the proximal direction relative to the catheter body to press the proximal end of the locking piece, and the locking claw of the locking piece and the balloon member are locked. In the case of having an annular projecting portion for releasing the locking state with the hole, the catheter main body is detachably locked with the locking claw of the locking piece to the locking hole of the balloon member. And the balloon member can be reliably connected and integrated.

  Furthermore, by releasing the outer cylinder toward the proximal end relative to the catheter body, the locking state of the locking claw of the locking piece and the locking hole of the balloon member is released, A situation in which the balloon member is unexpectedly detached and separated from the distal end portion of the catheter body does not occur, and the balloon member can be reliably detached and separated from the distal end portion of the catheter body at an appropriate time.

  Then, the locking piece of the connecting portion in the catheter body is pressed by the annular projecting portion of the outer cylinder, and even if the outer cylinder rotates and displaces relative to the catheter body in the circumferential direction, the outer cylinder The annular projecting portion can surely press the locking piece of the connection portion of the catheter body, so that the connection state between the balloon member and the catheter body can be reliably released by operating the outer cylinder.

  Further, since the connection between the balloon member and the catheter body is released by a simple operation such as displacing the outer tube relative to the catheter body, diagnosis and treatment using the balloon catheter can be performed. It can go smoothly and reduce the burden on the patient.

  Further, in the above balloon catheter, when the stopper is provided so as to protrude from the base end outer surface of the locking piece and to prevent the annular protruding portion of the outer cylinder from falling off the locking piece. Can reliably press the locking piece by the annular protrusion of the outer cylinder, and can reliably release the locking state between the locking claw of the locking piece and the locking hole of the balloon member. The balloon member and the catheter body can be reliably separated at a desired position in the cavity.

  Further, in the above balloon catheter, when the distal end portion of the spring support is inserted into the proximal end portion of the balloon member in a state where the catheter body and the balloon member are connected and integrated, In the state of connecting and integrating, the axial center of the balloon member and the axial center of the distal end portion of the catheter body are matched, and the connection portion between the balloon member and the distal end portion of the catheter body is unexpectedly greatly refracted. Can be prevented.

  Therefore, the balloon catheter is inserted into the living body cavity by pressing the proximal end portion of the catheter body toward the living body cavity. The balloon member of the balloon catheter can enter and be positioned at a desired location in the living body cavity.

  When the balloon catheter includes a regulating piece that is detachably disposed at the proximal end of the catheter body and prevents the outer tube from moving toward the proximal side relative to the catheter body. The balloon catheter can be inserted into the living body cavity while synchronizing the outer tube and the catheter body, and the balloon member is unexpectedly detached from the catheter body while the balloon catheter is being inserted into the living body cavity. In other words, the balloon member can enter and be positioned at a desired location in the living body cavity while reliably maintaining the state where the balloon member is connected to the catheter body.

  An example of the balloon catheter of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the balloon member 1 is integrally formed with a bottomed cylindrical body 11 having a constant inner and outer diameter, and an outer peripheral surface of a portion excluding the base end portion of the bottomed cylindrical body 11. And a balloon portion 12 that can be inflated and deflated. Note that the bottomed cylindrical body 11 is formed such that the tip end portion thereof is completely closed while the base end portion is fully open. Furthermore, a locking hole 13 having a horizontally long rectangular shape penetrating between the inner and outer peripheral surfaces is provided at the base end of the bottomed cylindrical body 11 of the balloon member 1.

  The balloon portion 12 has a length that is shorter than the length of the bottomed cylindrical body 11 and an elastic cylindrical body having both ends opened, and is fitted on the tip of the bottomed cylindrical body 11. The cylindrical body is formed by hermetically fixing the both ends of the cylindrical body to the outer peripheral surface of the bottomed cylindrical body 11 opposed to the entire body. In addition, the method for fixing both ends of the cylindrical body to the outer peripheral surface of the bottomed cylindrical body 11 is not particularly limited, and in addition to the method using thermal fusion, a method using an adhesive, a thread, or the like. Examples include how to bind.

  Then, by supplying fluid into the balloon part 12 through the fluid supply hole 14 penetrating through the bottomed cylindrical body 11 of the balloon member 1 between its inner and outer peripheral surfaces, the balloon part 12 is It is configured to expand and contract freely.

  The material constituting the cylindrical body is not particularly limited as long as it is elastically deformable, and examples thereof include natural rubber; silicone rubber; urethane rubber; polyolefin elastomer, polystyrene elastomer, polyamide elastomer, and the like. Thermoplastic elastomers; Polyethylene resins such as polyethylene, polypropylene, ethylene-α-olefin copolymers such as ethylene-propylene copolymer, propylene-α-olefin copolymers, ethylene-vinyl acetate copolymer, soft polychlorinated Examples thereof include vinyl, polyurethane, polyisoprene, and natural rubber, silicone rubber, and urethane rubber are preferable because the balloon portion 12 can be easily expanded and contracted in the living body cavity.

  Further, when the thickness of the cylindrical body is thin, the strength of the balloon portion 12 is reduced. On the other hand, when the thickness is thick, the insertion property of the balloon catheter A into the living body cavity is lowered, so 50 to 300 μm is preferable.

  Further, examples of the fluid include gases such as air, and liquids such as water, physiological saline, and gel-like medicine. As means for supplying the fluid into the bottomed cylindrical body 11 through the catheter body 2. The conventional fluid regulator such as a syringe barrel is used.

  Further, a valve body 15 is integrally provided on the distal end side of the locking hole 13 in the base end portion of the bottomed cylindrical body 11 of the balloon member 1. This valve body 15 is formed in a hemispherical dome shape, and the outer peripheral edge portion of the base end opening is hermetically fixed and integrated with the inner peripheral surface of the bottomed cylindrical body 11 over its entire circumference, A single slit portion 15a penetrating between both surfaces is formed in the central portion, that is, the central portion of the top portion, and the valve body 15 can be opened and closed freely by opening and closing the slit portion 15a. It is configured as follows.

  The material of the valve body 15 is not particularly limited as long as it can be elastically deformed. For example, an ethylene-α-olefin copolymer such as polyethylene, polypropylene, ethylene-propylene copolymer, propylene-α, and the like. -Polyolefin resins such as olefin copolymers and ethylene-vinyl acetate copolymers, polyesters such as polyethylene terephthalate, polyvinyl chloride, polyurethane, polyamide, polyimide, natural rubber, silicone rubber, urethane rubber, polyolefin elastomer, polystyrene Examples thereof include elastomers such as elastomers and polyamide-based elastomers.

  A cylindrical catheter body 2 is detachably connected to the proximal end portion of the balloon member 1. Both ends of the catheter main body 2 are opened to the whole, and the tip of the catheter main body 2 is formed at the sharp end 20, and the sharp end 20 of the catheter main body 2 is passed through the slit portion 15 a of the valve body 15. The valve body 15 is configured to be in an open state, and the valve body 15 is configured to be in a closed state by pulling out the sharp end 20 of the catheter body 2 from the slit portion 15a of the valve body 15 and removing it. Has been.

  Further, a connecting portion 2 a is integrally provided at the distal end portion of the catheter body 2. The spring support 21 of the connecting portion 2a is formed in a columnar body having a fixed length having an outer diameter slightly smaller than the inner diameter of the bottomed cylindrical body 11 of the balloon member 1. The spring support 21 is integrally provided at the distal end portion of the catheter main body 2 so that the distal end portion of the catheter main body 2 penetrates along the axis of the spring support 21.

  A coil spring 22 is wound around the spring support 21 as an elastic member, and a spring receiving portion 21a projecting in an annular shape on the outer peripheral edge of the base end of the spring support 21 is attached to the spring support 21. The base end is fixed. The coil spring 22 is in a state in which the distal end protrudes further to the distal end side than the distal end of the spring support 21 in an uncompressed state, while the portion other than the base end is free with respect to the spring support 21. It is in a state and is configured to be compressible in the length direction of the spring support 21.

  Furthermore, a flat horizontally-long rectangular locking piece 23 is integrally provided on the outer peripheral surface of the spring receiving portion 21a of the spring support 21 so as to be raised and lowered. The locking piece 23 has a proximal end portion of the locking piece 23 fixed to a support portion 24 protruding from the outer peripheral surface of the spring receiving portion 21a of the spring support 21 so as to be raised and lowered. The locking piece 23 is formed in a state inclined obliquely inward from the proximal end toward the distal end, and is formed elastically up and down around the support portion 24 of the spring support 21. .

  The front end of the locking piece 23 protrudes from the front end of the coil spring 22 to the front end side. A locking claw 23a having a right-angled triangular cross section is provided on the inner surface of the distal end of the locking piece 23 so as to be detachably locked to the locking hole 13 of the balloon member 1. The end surface of the locking claw 23a on the spring support 21 side is in contact with and locked to the proximal inner peripheral surface 13a of the locking hole 13 when locked to the locking hole 13 of the balloon member 1. On the other hand, the end surface on the balloon part 12 side of the locking claw 23a is formed on an inclined surface 232a inclined obliquely inward toward the spring support 21 side (base end side of the catheter body 2). Yes.

  Further, when an annular projecting portion 31 of the outer cylinder 3 to be described later presses the proximal end portion of the locking piece 23 inward, the annular projecting portion 31 of the outer cylinder 3 is In order to prevent falling off from the outer end surface, a stopper portion 23b projects outwardly from the outer end surface of the locking piece 23 over the entire length in the width direction.

  The distal end of the spring support 21 is inserted into the proximal end of the bottomed cylindrical body 11 of the balloon member 1, and the catheter body 2 is locked in the locking hole 13 of the balloon member 1. The locking claw 23a of the piece 23 is locked so as to be freely disengaged from the outside, and the balloon member 1 and the catheter body 2 are integrated so as to be separable (see FIG. 2). In this state, the sharp end 20 of the catheter body 2 passes through the slit portion 15a of the valve body 15 of the balloon member 1, and the valve body 15 is open.

  Furthermore, the distal end portion of the coil spring 22 wound around the spring support 21 is pressed in the compression direction by the proximal end opening end surface of the bottomed cylindrical body 11 of the balloon member 1, and the coil spring 22 is The bottom end cylindrical surface 11 of the bottomed cylindrical body 11 and the spring receiving portion 21a of the spring support 21 are compressed.

  Accordingly, the force in the direction of separating from each other along the axial direction is urged between the balloon member 1 and the catheter body 2 by the compression restoring force of the coil spring 22.

  The outer cylinder 3 is fitted to the catheter body 2 so as to be able to advance and retreat in the remaining portion of the catheter body 2 excluding the base end portion and the locking hole 13 of the bottomed cylindrical body 11 of the balloon member 1. ing.

  As shown in FIGS. 1 and 2, the outer cylinder 3 has flexibility so that it can be smoothly inserted into the living body cavity, and the operation force at the operation portion on the proximal end side is applied to the distal end side. It consists of a cylindrical body having a certain length with rigidity that can be smoothly transmitted. The inner diameter of the outer cylinder 3 is larger than the outer diameter of the bottomed cylindrical body 11 of the balloon member 1 and is formed in a state in which a space portion having a circular cross section penetrates between both ends over the entire length. ing.

  An annular projecting portion 31 having an inner diameter slightly larger than the outer diameter of the bottomed cylindrical body 11 of the balloon member 1 projects inwardly from the inner peripheral surface of the proximal end opening of the outer cylinder 3. Has been. The annular projecting portion 31 of the outer cylinder 3 is in contact with or close to the outer peripheral surface of the bottomed cylindrical body 11 of the balloon member 1 on the distal end side of the locking hole 13 of the balloon member 1. ing.

  By displacing the outer cylinder 3 toward the proximal side relative to the catheter body 2, the proximal end of the locking piece 23 of the catheter body 2 is moved by the annular projecting portion 31 of the outer cylinder 3. It is configured so that the locking state between the locking piece 23 and the locking hole 13 of the balloon member 1 can be released by pressing toward the direction.

  In addition, it does not specifically limit as a material which comprises the outer cylinder 3, For example, polyethylene-polypropylene, ethylene-alpha-olefin copolymers, such as an ethylene-propylene copolymer, propylene-alpha-olefin copolymer, ethylene -Polyolefin resin such as vinyl acetate copolymer; Polyester resin such as polyethylene terephthalate; Polyvinyl chloride; Polytetrafluoroethylene; Polyurethane; Polyamide; Polyimide; Silicone rubber Polyurethane and polyamide are preferred.

  Next, how to use the balloon catheter A will be described. First, as shown in FIG. 3, the catheter body 2 is inserted into the outer cylinder 3 from its proximal end opening portion so that the connecting portion 2 a is at the distal end side of the outer cylinder 3, and the outer cylinder 3. The proximal end portion of the balloon member 1 is inserted into the inside from the distal end opening.

  Subsequently, when the balloon member 1 and the catheter body 2 are brought close to each other against the elastic repulsion force of the coil spring 22 of the catheter body 2, the locking claw 23 a of the locking piece 23 of the catheter body 2 is attached to the balloon member 1. It rides on the bottomed cylindrical body 11.

  Further, the balloon member 1 and the catheter body 2 are brought close to each other against the elastic repulsion force of the coil spring 22 of the catheter body 2, and the engagement piece 23 of the catheter body 2 is engaged with the engagement hole 13 of the balloon member 1. The balloon member 1 and the catheter body 2 are detachably integrated with the pawl 23a being detachably locked from the outside (see FIG. 2).

  In this state, the annular projecting portion 31 of the outer cylinder 3 is in contact with or close to the outer peripheral surface of the bottomed cylindrical body 11 on the tip side of the locking hole 13 of the balloon member 1. In addition, the sharp end 20 of the catheter body 2 passes through the slit portion 15a of the valve body 15 of the balloon member 1 so that the valve body 15 is open.

  Further, the distal end portion of the spring support 21 of the connecting portion 2a is inserted into the proximal end portion of the bottomed cylindrical body 11 of the balloon member 1, and the coil wound around the spring support 21 The distal end portion of the spring 22 is pressed in the compression direction by the proximal end opening end surface of the bottomed cylindrical body 11 of the balloon member 1, and the coil spring 22 is the proximal end opening end surface of the bottomed cylindrical body 11 of the balloon member 1. And the spring receiving portion 21a of the spring support 21 are compressed.

  Therefore, in a state where the balloon member 1 and the catheter body 2 are connected and integrated via the connection portion 2a, the shafts between the balloon member 1 and the catheter body 2 are moved between the balloon member 1 and the catheter body 2 by the compression restoring force of the coil spring 22. Forces in directions away from each other along the core direction are urged.

  Further, as shown in FIG. 4, the balloon member 1 and the catheter body 2 are connected and integrated in a separable manner, and the outer cylinder 3 protrudes from the proximal end portion of the catheter body 2 protruding from the proximal end opening of the outer cylinder 3. A circular regulation piece 4 having an outer diameter larger than the outer diameter of the outer cylinder 3 is detachably fixed in contact with the proximal end opening end surface of the outer cylinder 3 so that the outer cylinder 3 is relatively relative to the catheter body 2. Do not displace to the base end side. The restricting piece 4 is not particularly limited as long as the outer tube 3 can be prevented from being displaced toward the proximal side relative to the catheter body 2, and as shown in FIG. It may be a rod-like body 4 ′ having a length longer than the diameter.

  The balloon catheter A thus assembled is inserted into the living body cavity with the balloon part 12 completely contracted, and the balloon part 12 of the balloon member 1 is positioned at a desired position in the living body cavity.

  Even when the outer tube 3 is unexpectedly hooked to the inner peripheral surface of the living body cavity when the balloon catheter A is inserted into the living body cavity, the restriction piece 4 is disposed at the proximal end portion of the catheter body 2. Therefore, the outer tube 3 is not displaced proximally relative to the catheter body 2, and the balloon catheter A is placed in the living body cavity while synchronizing the outer tube 3 and the catheter body 2. It can be inserted smoothly.

  Next, as shown in FIG. 6, fluid is supplied from the proximal end opening of the catheter body 2, and the balloon portion 12 is passed through the catheter body 2 and the fluid supply hole 14 of the bottomed cylindrical body 11 of the balloon member 1. A fluid is supplied into the balloon section 12 to inflate the balloon section 12, and the balloon section 12 is fixed to a desired portion of the living body cavity by the expansion force.

  Thereafter, the restriction piece 4 attached to the proximal end portion of the catheter body 2 is removed, and the outer tube 3 is displaced toward the proximal end side relative to the catheter body 2. Then, the annular projecting portion 31 of the outer cylinder 3 collides with the locking piece 23 (see FIG. 7).

  Further, when the outer cylinder 3 is displaced toward the base end side from this state, as shown in FIG. 8, the annular projecting portion 31 of the outer cylinder 3 moves the outer surface of the locking piece 23 toward the base end side. The annular projecting portion 31 presses the proximal end portion of the locking piece 23 inward. By the pressing by the annular protrusion 31, the locking piece 23 is elastically displaced in the direction in which the locking claw 23 a is displaced outward, and the locking claw 23 a of the locking piece 23 and the balloon member 1 are elastically displaced. The locked state with the locking hole 13 is released.

  Then, as shown in FIG. 9, a repulsive force in a direction away from each other by the coil spring 22 of the connecting portion 2 a acts between the balloon member 1 and the catheter main body 2, and this repulsive force causes the catheter main body to be separated. 2 is relatively displaced toward the proximal end side with respect to the balloon member 1, and the catheter body 2 and the balloon member 1 are completely separated.

  Further, along with the separation of the catheter body 2 and the balloon member 1, the sharp end 20 of the catheter body 2 is also pulled out from the slit portion 15a of the valve body 15. Then, the slit portion 15a of the valve body 15 after the sharp end 20 of the catheter body 2 is pulled out is automatically closed by the fluid pressure supplied into the balloon portion 12, and the balloon portion 12 of the balloon member 1 is expanded. Ensure state is maintained. The balloon member 1 is placed in the living body cavity with the balloon portion 12 inflated.

  As described above, when detaching the balloon member 1 from the catheter body 2, the balloon member 1 is moved to the balloon portion 12 by a simple operation of displacing the outer cylinder 3 relative to the catheter body 2 relative to the proximal end side. The balloon member 1 can be reliably detached from the catheter body 2 while maintaining the inflated state, and the balloon member 1 can be stably placed at a desired position in the living body cavity. After the catheter body 2 is taken out from the living body cavity, another treatment instrument or inspection instrument can be inserted into the living body cavity so that treatment or examination can be performed smoothly.

  Further, in the above balloon catheter, the case where the valve body 15 is opened and closed by forming the slit portion 15a in the valve body 15 and inserting and removing the distal end portion of the catheter body 2 into the slit portion 15a has been described. While the slit 15a is not formed in the valve body 15, a needle-like body is provided integrally instead of forming a sharp end at the tip of the catheter body 2, and a through-hole is formed in the needle-like body over its entire length. The through hole may be communicated with the catheter body 2.

  Then, by passing the needle-like body of the catheter body 2 through the valve body 15, the balloon portion 12 of the balloon member 1 and the inside of the catheter body 2 are communicated with each other through the needle-like body, and the fluid supplied through the catheter body 2. Is formed so as to be able to flow into the balloon portion 12 through the needle-like body and the fluid supply hole 14 of the balloon member, while the needle-like body of the catheter body 2 is pulled out from the valve body 15 and formed in the valve body 15. The hole is automatically closed, the fluid is prevented from flowing out from inside the balloon part 12, and the inflated state of the balloon part 12 can be maintained.

It is the disassembled perspective view which showed the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed the balloon catheter of this invention. It is a decomposition | disassembly longitudinal cross-sectional view of the balloon catheter of FIG. It is the perspective view which showed the control piece. It is the perspective view which showed another example of the control piece. It is the longitudinal cross-sectional view which showed the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed the use condition of the balloon catheter of FIG.

Explanation of symbols

1 Balloon material
11 Bottomed cylindrical body
12 Balloon part
13 Locking hole
14 Fluid supply hole
15 Disc
15a Slit 2 Catheter body
2a connection
20 sharp edges
21 Spring support
21a Spring catch
22 Coil spring
23 Locking piece
23a Claw
23b Stopper
24 Support section 3 outer cylinder
31 Toroidal protrusion
231a Contact surface
232a Inclined surface 4 Regulating piece A Balloon catheter

Claims (5)

A balloon member integrally provided with an inflatable / shrinkable balloon part and a valve body integrally provided for preventing outflow of fluid supplied into the balloon part, and a state in which the valve body is opened A cylindrical catheter body that is detachably connected to the distal end portion, and a connection portion that is integrally provided at the distal end portion of the catheter body, the spring support being integrally provided at the distal end portion of the catheter body. The catheter body and the balloon member are integrated with the body and the spring support body so as to be undulated and removably locked in a locking hole formed at the base end of the balloon member. And the catheter body with respect to the balloon member in a state where the locking piece is wound around the spring support and the locking piece is locked in the locking hole of the balloon member. A connecting portion having a coil spring that biases in the direction in which it is sandwiched, and an outer cylinder that is fitted on the catheter body and releases the locking state between the locking piece of the connecting portion and the locking hole of the balloon member A balloon catheter comprising: A locking claw that protrudes from the inner surface of the distal end of the locking piece and removably engages with a locking hole of the balloon member, protrudes from the inner peripheral surface of the distal end of the outer cylinder, and the outer cylinder is connected to the catheter body. The base end portion of the locking piece is pressed inward by displacing the locking piece relative to the base end direction, and the locking claw of the locking piece and the locking hole of the balloon member A balloon catheter comprising an annular projecting portion for releasing the locked state. 3. The stopper according to claim 2, further comprising a stopper projecting from the outer surface of the base end of the locking piece and preventing the annular projecting portion of the outer cylinder from falling off the locking piece. The balloon catheter described. 4. The device according to claim 1, wherein the distal end portion of the spring support is inserted into the proximal end portion of the balloon member in a state where the catheter body and the balloon member are connected and integrated. The balloon catheter according to 1. 2. A restricting piece that is detachably disposed at a proximal end portion of the catheter body and prevents the outer cylinder from moving toward the proximal end side relative to the catheter body. The balloon catheter of any one of Claim 4.

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