JPWO2007094374A1 - Balloon catheter - Google Patents

Abstract

The present invention is inserted into a living body for examination and treatment to expand the stenosis and maintain the expanded state, exfoliate the tissue and maintain the exfoliated state, and lift the tissue or maintain the lifted state. A balloon catheter that can be smoothly performed is provided. The balloon catheter A of the present invention includes a catheter body 1, a slide member 2 disposed at the distal end portion of the catheter body 1 and slidable in the length direction of the catheter body 1, and the distal end portion of the catheter body 1. And a balloon 3 that can be inflated and deflated by fixing the distal end to the distal end of the slide member 2.

Description

  The present invention is used by being inserted into a living body for examination and treatment, and expands the stenosis and maintains the expanded state, exfoliates the tissue and maintains the exfoliated state, and lifts the tissue. The present invention relates to a balloon catheter that can be maintained smoothly.

  Today, minimally invasive treatments 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 removal. Proposed and used. As such a balloon catheter, Patent Document 1 proposes a balloon catheter in which the film thickness of the tapered portion satisfies a predetermined formula everywhere on the tapered portion of the balloon.

  However, when a balloon is inflated by supplying a fluid from the fluid supply port of the catheter body of the balloon catheter into the balloon, the balloon portion near the fluid supply port expands more than the balloon portion far from the fluid supply port. As a result, wrinkles may occur in the balloon part away from the fluid supply port and the balloon may not be inflated smoothly, and the balloon may not be inflated uniformly, or the balloon may burst at a specified pressure capacity or less. The problem was.

Japanese Patent Laid-Open No. 2003-144553

  The present invention is capable of inflating a balloon as a whole in a stable manner, expanding a stenosis and maintaining the expanded state, exfoliating the tissue and maintaining the exfoliated state, and lifting the tissue or maintaining the lifted state. Provided is a balloon catheter that can be smoothly performed.

  The balloon catheter of the present invention has a catheter body, a slide member disposed at the distal end portion of the catheter body and slidable in the length direction of the catheter body, and a proximal end portion fixed to the distal end portion of the catheter body. And a balloon capable of being inflated and deflated by fixing the tip to the tip of the slide member.

  The balloon catheter includes a cylindrical body fitted on the distal end portion of the slide member, and the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the outer peripheral surface of the cylindrical body. It is characterized in that the tip of the balloon is fixed.

  Furthermore, the balloon catheter is characterized in that the tubular body and the catheter body are in contact with each other in the deflated state of the balloon.

  In the balloon catheter, the outer peripheral surface of the joint portion between the tubular body and the catheter body is flush with the tubular body and the catheter body in contact with each other. And

  The balloon catheter is provided with a detachment preventing means for preventing the slide member from detaching from the catheter body.

  Further, in the balloon catheter, a locking portion protruding inwardly at the distal end opening of the catheter body and a protruding portion outwardly protruding at the base end portion of the slide member are engaged with the locking portion. And a flange portion that is detachably locked.

  Further, in the balloon catheter, an enlarged head is formed at the distal end portion of the slide member, the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the outer peripheral surface of the enlarged head portion of the slide member. It is characterized in that the tip of the balloon is fixed.

  The balloon catheter of the present invention has a catheter body, a slide member disposed at the distal end portion of the catheter body and slidable in the length direction of the catheter body, and a proximal end portion fixed to the distal end portion of the catheter body. And a balloon that can be inflated and deflated by adhering the distal end to the distal end of the slide member, and the slide member disposed at the distal end of the catheter body as the balloon expands is the length of the catheter body. The balloon protrudes in the vertical direction, and the balloon is inflated while thinning the film thickness substantially uniformly throughout the inflating process.

  Therefore, the balloon does not form a weakened part that is partially thinned during the inflation process, and the fluid pressure supplied into the balloon is applied almost uniformly to the entire balloon without deforming the balloon. It can be inflated as a whole and smoothly inflated into a predetermined shape.

  The balloon catheter includes a cylindrical body fitted on the distal end portion of the slide member, and the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the outer peripheral surface of the cylindrical body. When the tip of the balloon is fixed, the slide member is housed inside the catheter body in the deflated state of the balloon, and the outer diameter of the catheter body, and hence the outer diameter of the deflated balloon is reduced. Therefore, it is possible to facilitate the insertion of the balloon catheter into the patient's living body cavity and to reduce the burden on the patient.

  Further, in the above balloon catheter, when the tubular body and the catheter body are in contact with each other in the deflated state of the balloon, the length of the balloon is minimized when the balloon is deflated. The balloon is configured not to contract in the length direction.

  Therefore, when the balloon catheter is inserted into the living body cavity of the patient, the balloon is not deformed in the length direction and does not expand in the radial direction. The balloon catheter can be smoothly inserted into the living body cavity of the patient. The burden on the patient can be reduced.

  Further, in the balloon catheter, when the cylindrical body and the catheter body are in contact with each other, the outer peripheral surface of the joint portion between the cylindrical body and the catheter body is flush with the balloon catheter. When the balloon is deflated, the joint between the tubular body and the catheter body can be kept smooth without any step, and the step formed at the joint between the catheter body and the tubular body is the inner peripheral surface of the living body cavity. Therefore, it is possible to reduce the burden on the patient by smoothly inserting the balloon catheter into the living body cavity of the patient.

  Furthermore, when the balloon catheter is provided with a separation preventing means for preventing the slide member from being detached from the catheter body, the slide member is unexpectedly detached from the catheter body during the balloon inflation process. It is possible to inflate the balloon accurately and reliably in the living body cavity while reliably preventing this.

  Further, in the balloon catheter, a locking portion projecting inwardly at the distal end opening of the catheter main body and a locking portion projecting outward from the proximal end portion of the slide member are engaged with the locking portion. And a flange portion that is removably latched, the balloon can be more accurately inserted into the living body cavity while more reliably preventing the slide member from being accidentally detached from the catheter body during the balloon inflation process. And can be reliably inflated.

  In the balloon catheter, an enlarged head is formed at the distal end portion of the slide member, the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the outer peripheral surface of the enlarged head portion of the slide member. When the tip of the balloon is fixed to the balloon, the number of parts constituting the balloon catheter can be reduced.

  Further, the slide member is prevented from being inserted into the catheter body more than necessary by the enlarged head, and when the balloon catheter is inserted into the living body cavity of the patient, the balloon is contracted and deformed in the length direction thereof. The balloon catheter can be smoothly inserted into the living body cavity of the patient and the burden on the patient can be reduced.

It is the longitudinal cross-sectional view which showed the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed one form of the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed one form of the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed one form of the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed the state which expanded the balloon of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention.

Explanation of symbols

1 Catheter body 2 Slide member 3 Balloon 4 Removal prevention means
11 lumens
12 Ring-shaped locking part
21 Tubular body
21a Fluid supply port
22 Ring-shaped flange
23 Fluid supply port A Balloon catheter

  An example of the balloon catheter of the present invention will be described with reference to the drawings. As shown in FIG. 1, the catheter main body 1 constituting the balloon catheter A has flexibility so that it can be smoothly inserted into the living body cavity, and is operated at the proximal end operation portion. It consists of a cylindrical rod-shaped body having a certain length with rigidity capable of smoothly transmitting force to the tip side, and a lumen 11 having a circular cross section is formed over the entire length thereof. The tip is open all over.

  In addition, it does not specifically limit as a material which comprises the catheter main body 1, For example, polyethylene-polypropylene, ethylene-alpha-olefin copolymers, such as an ethylene-propylene copolymer, propylene-alpha-olefin copolymers, etc. Polyolefin resin; ethylene-vinyl acetate copolymer; flexible polyester resin such as polyethylene terephthalate, polyvinyl chloride, polytetrafluoroethylene, polyurethane, polyamide, polyimide, silicone rubber, silicone rubber, natural rubber Examples thereof include polymer materials, and polyurethane and polyamide are preferable.

  In the distal end portion of the catheter body 1, a cylindrical slide having a constant length having a constant outer diameter substantially matching the inner diameter of the lumen 11 of the catheter main body 1 and having both ends opened completely. The member 2 is slidably inserted in the length direction of the catheter body 1 (along the axis of the catheter body 1).

  The outer peripheral surface of the slide member 2 and the inner peripheral surface of the distal end opening of the catheter body 1 that is in sliding contact with the outer peripheral surface are both formed as smooth surfaces, and sliding friction between the slide member 2 and the catheter body 1 is achieved. The force is configured to be small.

  Furthermore, the slide member 2 is always in a state in which the distal end portion protrudes from the distal end opening of the catheter body 1, and the tubular body 21 is fitted and integrated with the projected distal end portion of the slide member 2. It has become.

  Specifically, the cylindrical body 21 has a constant outer diameter that matches the outer diameter of the catheter body 1 and an inner diameter that matches the outer diameter of the slide member 2, and the tip opening is completely closed. It is formed in a bottom cylindrical shape. Then, the distal end portion of the slide member 2 is inserted into the proximal end opening of the tubular body 21 and fixed and integrated, and the tubular body 21 is in a state where a part of the tubular body 21 protrudes from the distal end of the slide member 2. Is fixed to the tip of the slide member 2.

  Then, the distal end portion of the tubular body 21, that is, the tubular body 21 portion protruding from the distal end of the slide member 2 is filled with a fluid such as gas or liquid supplied through the lumen 11 of the catheter body 1 in the balloon 3 described later. A fluid supply port 21a for supplying to the inside of the balloon 3 penetrates between the inner and outer peripheral surfaces. By supplying and discharging fluid into the balloon 3 through the fluid supply port 21a, the balloon 3 is inflated. Configured to contract.

  Examples of the fluid include gases such as air, and liquids such as water, physiological saline, and gel-like drugs. As means for supplying the fluid into the balloon 3, conventionally used injections are used. A fluid regulator such as a cylinder is used.

  Here, the slide member 2 can be bent following the bending of the catheter body 1, but the portion protruding from the distal end opening of the catheter body 1 is in a straight line state despite the stress generated when the balloon 3 is inflated. It is formed from the material which has the intensity | strength which can be maintained in this.

  Specifically, the slide member 2 is preferably made of a material having a strength equal to or higher than that of the material constituting the catheter body 1, and examples of such a material include ABS resin and nylon. Examples thereof include synthetic resins such as stainless steel, nickel titanium alloy, platinum nickel alloy and other metals, gold, platinum and other metals.

  A balloon 3 that can be inflated and deflated is integrally provided at the distal end of the catheter body 1. Specifically, the distal end portion of the catheter body 1 is formed of an elastic material that is uniformly stretchable in the length direction and the radial direction, and has a constant inner and outer diameter slightly larger than the outer diameter of the catheter body 1. A cylindrical body is covered with the proximal end of the cylindrical body on the outer peripheral surface of the catheter body 1 and the distal end of the cylindrical body is integrated with the outer peripheral surface of the cylindrical body 21 on the distal side of the fluid supply port 21a. Thus, the balloon 3 is configured.

  At this time, in a state where the balloon 3 is completely deflated, the distal end surface of the catheter body 1 and the proximal end surface of the cylindrical body 21 are joined together over the entire circumference thereof, and the catheter body 1 The outer peripheral surface of the distal end of the tube and the outer peripheral surface of the base end of the cylindrical body 21 are flush with each other, and the outer peripheral surface of the joint portion between the catheter body 1 and the cylindrical body 21 has a smooth periphery without a step. Formed on the surface.

  The cylindrical body constituting the balloon is formed so that its inner diameter is substantially equal to the outer diameter of the catheter body 1, and as shown in FIG. 2, when the balloon 3 'is deflated, the inner periphery of the balloon 3' is formed. You may comprise so that the whole surface may be in the state closely_contact | adhered to the outer peripheral surface of the catheter main body 1 and the cylindrical body 21. FIG. Since the configuration other than the above is the same as that of the balloon catheter A shown in FIG. 1, the same reference numerals are given and the description thereof is omitted.

  Here, the method of integrating the proximal end of the cylindrical body constituting the balloon into the catheter body 1 and the distal end of the cylindrical body into the outer peripheral surface of the cylindrical body 21 is not particularly limited, and heat fusion is performed. , A method using an adhesive, a method of binding both open ends of a cylindrical body with a thread, and the like.

  The material constituting the balloon 3 is not particularly limited. For example, natural rubber; silicone rubber; urethane rubber; thermoplastic elastomer such as polyolefin elastomer, polystyrene elastomer, polyamide elastomer; polyethylene, polypropylene, ethylene- Polyolefin resins such as ethylene-α-olefin copolymers such as propylene copolymers and propylene-α-olefin copolymers; ethylene-vinyl acetate copolymers, soft polyvinyl chloride, polyurethane, polyisoprene, etc. Natural rubber, silicone rubber, and urethane rubber are preferred because the balloon can be easily expanded and contracted in the living body cavity.

  As shown in FIG. 1, the balloon 3 is in a completely contracted state, that is, in a normal state, the opposed surfaces of the catheter body 1 and the tubular body 21 are completely in contact with each other over the entire circumference. Thus, the slide member 2 is completely accommodated in the catheter body 1 and the tubular body 21, while the fluid supplied through the lumen 11 of the catheter body 1 as shown in FIGS. 4 and 5. Is supplied into the balloon 3 through the fluid supply port 21a of the cylindrical body 21 and the balloon 3 is inflated, the slide member 2 gradually protrudes from the distal end opening of the catheter body 1 as the balloon 3 expands. The tubular body 21 and the catheter body 1 are configured to be separated from each other.

  Next, how to use the balloon catheter A will be described. In the following, an example will be described in which the balloon catheter A is used to expand a stenosis in a living body cavity such as a blood vessel, trachea, or digestive tract.

  First, the balloon catheter A is inserted into the living body cavity, and the distal end portion of the balloon catheter A is positioned in the narrowed portion of the living body cavity. At this time, when the balloon 3 of the balloon catheter A is deflated, the opposing surfaces of the catheter body 1 and the tubular body 21 are in close contact with each other, and the slide member 2 is further in contact with the catheter body 1. The proximal end portion is fixed to the outer peripheral surface of the distal end portion of the catheter body 1 and the distal end portion is fixed to the outer peripheral surface of the distal end portion of the cylindrical body 21. The balloon 3 is not deflated in the length direction and swelled in the radial direction, and the balloon catheter A is smoothly inserted into the living body cavity of the patient while the outer diameter of the balloon 3 is maintained at the minimum diameter. Can do.

  Next, fluid is supplied into the balloon 3 of the balloon catheter A through the lumen 11 of the catheter body 1, the slide member 2, and the fluid supply port 21 a of the cylindrical body 21. Then, as shown in FIG. 3, the balloon 3 has its tip portion, specifically, a portion in the vicinity of the fluid supply port 21a of the cylindrical body 21 gradually in the radial direction as the fluid flows in. Inflate. When the distal end portion of the balloon 3 is inflated to the vicinity of the expansion limit, an excessive inflating force is required for further expansion of the distal end portion of the balloon 3, so that as shown in FIG. The inflowing fluid increases the amount of inflow toward the proximal end side of the balloon 3.

  Then, as the amount of fluid flowing in the length direction of the balloon 3 increases, the balloon 3 begins to expand while expanding in the length direction, and the catheter body 1 follows the expansion of the balloon 3 in the length direction. The slide member 2 accommodated in the tube gradually protrudes from the distal end opening of the catheter body 1 and is separated from each other while maintaining the state where the cylindrical body 21 and the catheter body 1 are connected via the slide member 2. Go.

  The distance between the catheter body 1 and the cylindrical body 21 allows the balloon 3 to be smoothly elongated in the length direction, and the balloon 3 can be stretched substantially uniformly over the entire length in the length direction.

  Accordingly, a part of the balloon 3 extends excessively, and a weak part having a thin film thickness is partially generated. The fluid pressure is concentrated on the weak part, and the weak part expands excessively as compared with other parts. As a result, the balloon 3 expands substantially uniformly over the entire length in the longitudinal direction without partially forming the weak body portion (see FIG. 5).

  The separation between the catheter body 1 and the tubular body 21 is performed in synchronization with the degree of expansion of the balloon 3, so that the separation between the catheter body 1 and the tubular body 21 is delayed with respect to the inflation of the balloon 3. The expansion of the balloon 3 is prevented, or the separation between the catheter body 1 and the tubular body 21 precedes the expansion of the balloon 3, and the balloon 3 is forcibly extended in the length direction thereof, so that the balloon 3 is wrinkled. An unexpected situation does not occur in which the balloon 3 is not inflated smoothly.

  Therefore, in any state from the deflated state to the fully inflated state, the balloon 3 is surely inflated into a predetermined shape almost uniformly without wrinkles or deforming in part. To do.

  When the balloon 3 of the balloon catheter A is deflated, the fluid in the balloon 3 may be discharged to the outside through the fluid supply port 21 of the cylindrical body 21, the slide member 2, and the lumen 11 of the catheter body 1. Then, the slide member 2 slides into the distal end opening of the catheter body 1 in synchronization with the contraction of the balloon 3, and the slide member 2 has a portion other than the distal end to which the cylindrical body 21 is fixed. The proximal end surface of the cylindrical body 21 and the distal end opening end surface of the catheter body 1 are joined to each other, and the balloon 3 is restored to its original contracted state. In order to adjust the degree of expansion of the balloon 3 of the balloon catheter A, the amount of fluid supplied into the balloon 3 may be adjusted as described above.

  In this way, by supplying or discharging the fluid from outside the living body through the catheter body 1 into the balloon 3 of the balloon catheter A, the balloon 3 of the balloon catheter A can be inflated and contracted into a predetermined shape with high accuracy and reliability. Treatment can be performed smoothly without burdening the patient.

  Further, in the balloon catheter A, the balloon catheter A may be provided with a detachment preventing means 4 so that the slide member 2 is not completely removed from the proximal end opening of the catheter body 1.

  Such a detachment prevention means 4 includes the structure shown in FIG. That is, the radial thickness of the catheter main body 1 is reduced so that the inner diameter of the catheter main body 1 is larger than the outer diameter of the slide member 2, and the inner diameter of the catheter main body 1 toward the inner end of the distal end opening is increased. Is provided with a ring-shaped locking portion 12 having a constant width substantially matching the outer diameter of the slide member. On the other hand, a ring-shaped flange portion 22 having a constant width whose outer diameter matches the substantially inner diameter of the catheter body 1 protrudes outwardly from the proximal end opening edge of the slide member 2. When the slide member 2 protrudes from the proximal end opening of the catheter body 1, as shown in FIG. 7, the ring-shaped locking portion 12 of the catheter body 1, the ring-shaped flange portion 22 of the slide member 2, Are configured such that the slide member 2 is completely detached from the proximal end opening of the catheter body 1 and the slide member 2 is not detached from the catheter body 1. Good. Except for the above, the configuration is the same as that of the balloon catheter A shown in FIG.

  Further, in the balloon catheter A, the case where the cylindrical body 21 is integrally fitted to the distal end portion of the slide member 2 and the distal end portion of the balloon 3 is integrally fixed to the outer peripheral surface of the cylindrical body 21 will be described. However, as shown in FIG. 8, the tip of the balloon 3 is directly fixed and integrated with the outer peripheral surface of the tip of the slide member 2 without fitting the cylindrical body 21 to the slide member 2. There may be. In such a case, the distal end opening of the slide member 2 is completely closed, and the fluid supply port 23 communicating with the inside of the balloon 3 penetrates between the inner and outer peripheral surfaces at the distal end of the slide member 2. It is penetrated by. Except for the above, the configuration is the same as that of the balloon catheter A shown in FIG.

  Further, FIG. 8 illustrates the case where the slide member 2 is formed to have the same outer diameter over the entire length, but as shown in FIG. 9, the distal end of the catheter body 1 is in a state where the balloon 3 is completely deflated. The distal end portion of the slide member 2 protruding from the end portion may be an enlarged head 24 having an annular cross section having the same outer diameter as the outer diameter of the catheter body 1 over its entire length. The enlarged head 24 is provided with a fluid supply port 25 penetrating between the inner and outer peripheral surfaces thereof, so that the balloon 3 and the slide member 2 are in communication with each other. Note that the enlarged head 24 only needs to have the same outer diameter as the outer diameter of the catheter body 1. For example, the thickness of the slide member 2 is uniform over the entire length thereof, and the distal end portion of the slide member 2 is formed. The enlarged head portion 24 may be formed by expanding the diameter of.

  When the balloon 3 is completely deflated, the proximal end surface of the enlarged head 24 of the slide member 2 and the distal end surface of the catheter body 1 are in contact with each other over the entire circumference, and the slide member 2 is in contact. And the outer peripheral surface of the joint portion between the enlarged head 24 and the enlarged head 24 are flush with each other to form a smooth joint surface. In addition, about the same structure part as the balloon catheter A shown in FIG. 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The balloon catheter of the present invention can inflate the balloon as a whole, expand the stenosis and maintain the expanded state, exfoliate the tissue and maintain the exfoliated state, and lift or lift the tissue. The state can be maintained smoothly and can be used for various treatments or diagnoses.

  The present invention is used by being inserted into a living body for examination and treatment, and expands the stenosis and maintains the expanded state, exfoliates the tissue and maintains the exfoliated state, and lifts the tissue. The present invention relates to a balloon catheter that can be maintained smoothly.

  Today, minimally invasive treatments 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. As such a balloon catheter, Patent Document 1 proposes a balloon catheter in which the film thickness of the tapered portion satisfies a predetermined formula everywhere on the tapered portion of the balloon.

  However, when a balloon is inflated by supplying a fluid from the fluid supply port of the catheter body of the balloon catheter into the balloon, the balloon portion near the fluid supply port expands more than the balloon portion far from the fluid supply port. As a result, wrinkles may occur in the balloon part away from the fluid supply port and the balloon may not be inflated smoothly, and the balloon may not be inflated uniformly, or the balloon may burst at a specified pressure capacity or less. The problem was.

Japanese Patent Laid-Open No. 2003-144553

  The present invention is capable of inflating a balloon as a whole in a stable manner, expanding a stenosis and maintaining the expanded state, exfoliating the tissue and maintaining the exfoliated state, and lifting the tissue or maintaining the lifted state. Provided is a balloon catheter that can be smoothly performed.

The balloon catheter of the present invention has a catheter body, a slide member disposed at the distal end portion of the catheter body and slidable in the length direction of the catheter body, and a proximal end portion fixed to the distal end portion of the catheter body. And a balloon that can be inflated and deflated by fixing the distal end portion to the distal end portion of the slide member, a locking portion projecting inwardly at the distal end opening of the catheter body, and a base of the slide member And a flange portion projecting outward from the end portion and detachably locked to the locking portion .

The balloon catheter of the present invention includes a catheter body, a slide member disposed at the distal end portion of the catheter body and slidable in the length direction of the catheter body, and a proximal end portion at the distal end portion of the catheter body. And a balloon that can be inflated and deflated by fixing the distal end portion to the distal end portion of the slide member, an enlarged head is formed at the distal end portion of the slide member, and a proximal end portion of the slide member Is inserted into the distal end portion of the catheter body, and the distal end portion of the balloon is fixed to the outer peripheral surface of the enlarged head portion of the slide member .

  The balloon catheter of the present invention has a catheter body, a slide member disposed at the distal end portion of the catheter body and slidable in the length direction of the catheter body, and a proximal end portion fixed to the distal end portion of the catheter body. And a balloon that can be inflated and deflated by adhering the distal end to the distal end of the slide member, and the slide member disposed at the distal end of the catheter body as the balloon expands is the length of the catheter body. The balloon protrudes in the vertical direction, and the balloon is inflated while thinning the film thickness substantially uniformly throughout the inflating process.

  Therefore, the balloon does not form a weakened part that is partially thinned during the inflation process, and the fluid pressure supplied into the balloon is applied almost uniformly to the entire balloon without deforming the balloon. It can be inflated as a whole and smoothly inflated into a predetermined shape.

  The balloon catheter includes a cylindrical body fitted on the distal end portion of the slide member, and the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the outer peripheral surface of the cylindrical body. When the tip of the balloon is fixed, the slide member is housed inside the catheter body in the deflated state of the balloon, and the outer diameter of the catheter body, and hence the outer diameter of the deflated balloon is reduced. Therefore, it is possible to facilitate the insertion of the balloon catheter into the patient's living body cavity and to reduce the burden on the patient.

  Further, in the above balloon catheter, when the tubular body and the catheter body are in contact with each other in the deflated state of the balloon, the length of the balloon is minimized when the balloon is deflated. The balloon is configured not to contract in the length direction.

  Therefore, when the balloon catheter is inserted into the living body cavity of the patient, the balloon is not deformed in the length direction and does not expand in the radial direction. The balloon catheter can be smoothly inserted into the living body cavity of the patient. The burden on the patient can be reduced.

  Further, in the balloon catheter, when the cylindrical body and the catheter body are in contact with each other, the outer peripheral surface of the joint portion between the cylindrical body and the catheter body is flush with the balloon catheter. When the balloon is deflated, the joint between the tubular body and the catheter body can be kept smooth without any step, and the step formed at the joint between the catheter body and the tubular body is the inner peripheral surface of the living body cavity. Therefore, it is possible to reduce the burden on the patient by smoothly inserting the balloon catheter into the living body cavity of the patient.

  Furthermore, when the balloon catheter is provided with a separation preventing means for preventing the slide member from being detached from the catheter body, the slide member is unexpectedly detached from the catheter body during the balloon inflation process. It is possible to inflate the balloon accurately and reliably in the living body cavity while reliably preventing this.

  Further, in the balloon catheter, a locking portion projecting inwardly at the distal end opening of the catheter main body and a locking portion projecting outward from the proximal end portion of the slide member are engaged with the locking portion. And a flange portion that is removably latched, the balloon can be more accurately inserted into the living body cavity while more reliably preventing the slide member from being accidentally detached from the catheter body during the balloon inflation process. And can be reliably inflated.

  In the balloon catheter, an enlarged head is formed at the distal end portion of the slide member, the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the outer peripheral surface of the enlarged head portion of the slide member. When the tip of the balloon is fixed to the balloon, the number of parts constituting the balloon catheter can be reduced.

  Further, the slide member is prevented from being inserted into the catheter body more than necessary by the enlarged head, and when the balloon catheter is inserted into the living body cavity of the patient, the balloon is contracted and deformed in the length direction thereof. The balloon catheter can be smoothly inserted into the living body cavity of the patient and the burden on the patient can be reduced.

  An example of the balloon catheter of the present invention will be described with reference to the drawings. As shown in FIG. 1, the catheter main body 1 constituting the balloon catheter A has flexibility so that it can be smoothly inserted into the living body cavity, and is operated at the proximal end operation portion. It consists of a cylindrical rod-shaped body having a certain length with rigidity capable of smoothly transmitting force to the tip side, and a lumen 11 having a circular cross section is formed over the entire length thereof. The tip is open all over.

  In addition, it does not specifically limit as a material which comprises the catheter main body 1, For example, polyethylene-polypropylene, ethylene-alpha-olefin copolymers, such as an ethylene-propylene copolymer, propylene-alpha-olefin copolymers, etc. Polyolefin resin; ethylene-vinyl acetate copolymer; flexible polyester resin such as polyethylene terephthalate, polyvinyl chloride, polytetrafluoroethylene, polyurethane, polyamide, polyimide, silicone rubber, silicone rubber, natural rubber Examples thereof include polymer materials, and polyurethane and polyamide are preferable.

  In the distal end portion of the catheter body 1, a cylindrical slide having a constant length having a constant outer diameter substantially matching the inner diameter of the lumen 11 of the catheter main body 1 and having both ends opened completely. The member 2 is slidably inserted in the length direction of the catheter body 1 (along the axis of the catheter body 1).

  The outer peripheral surface of the slide member 2 and the inner peripheral surface of the distal end opening of the catheter body 1 that is in sliding contact with the outer peripheral surface are both formed as smooth surfaces, and sliding friction between the slide member 2 and the catheter body 1 is achieved. The force is configured to be small.

  Furthermore, the slide member 2 is always in a state in which the distal end portion protrudes from the distal end opening of the catheter body 1, and the tubular body 21 is fitted and integrated with the projected distal end portion of the slide member 2. It has become.

  Specifically, the cylindrical body 21 has a constant outer diameter that matches the outer diameter of the catheter body 1 and an inner diameter that matches the outer diameter of the slide member 2, and the tip opening is completely closed. It is formed in a bottom cylindrical shape. Then, the distal end portion of the slide member 2 is inserted into the proximal end opening of the tubular body 21 and fixed and integrated, and the tubular body 21 is in a state where a part of the tubular body 21 protrudes from the distal end of the slide member 2. Is fixed to the tip of the slide member 2.

  Then, the distal end portion of the tubular body 21, that is, the tubular body 21 portion protruding from the distal end of the slide member 2 is filled with a fluid such as gas or liquid supplied through the lumen 11 of the catheter body 1 in the balloon 3 described later. A fluid supply port 21a for supplying to the inside of the balloon 3 penetrates between the inner and outer peripheral surfaces. By supplying and discharging fluid into the balloon 3 through the fluid supply port 21a, the balloon 3 is inflated. Configured to contract.

  Examples of the fluid include gases such as air, and liquids such as water, physiological saline, and gel-like drugs. As means for supplying the fluid into the balloon 3, conventionally used injections are used. A fluid regulator such as a cylinder is used.

  Here, the slide member 2 can be bent following the bending of the catheter body 1, but the portion protruding from the distal end opening of the catheter body 1 is in a straight line state despite the stress generated when the balloon 3 is inflated. It is formed from the material which has the intensity | strength which can be maintained in this.

  Specifically, the slide member 2 is preferably made of a material having a strength equal to or higher than that of the material constituting the catheter body 1, and examples of such a material include ABS resin and nylon. Examples thereof include synthetic resins such as stainless steel, nickel titanium alloy, platinum nickel alloy and other metals, gold, platinum and other metals.

  A balloon 3 that can be inflated and deflated is integrally provided at the distal end of the catheter body 1. Specifically, the distal end portion of the catheter body 1 is formed of an elastic material that is uniformly stretchable in the length direction and the radial direction, and has a constant inner and outer diameter slightly larger than the outer diameter of the catheter body 1. A cylindrical body is covered with the proximal end of the cylindrical body on the outer peripheral surface of the catheter body 1 and the distal end of the cylindrical body is integrated with the outer peripheral surface of the cylindrical body 21 on the distal side of the fluid supply port 21a. Thus, the balloon 3 is configured.

  At this time, in a state where the balloon 3 is completely deflated, the distal end surface of the catheter body 1 and the proximal end surface of the cylindrical body 21 are joined together over the entire circumference thereof, and the catheter body 1 The outer peripheral surface of the distal end of the tube and the outer peripheral surface of the base end of the cylindrical body 21 are flush with each other, and the outer peripheral surface of the joint portion between the catheter body 1 and the cylindrical body 21 has a smooth periphery without a step. Formed on the surface.

  The cylindrical body constituting the balloon is formed so that its inner diameter is substantially equal to the outer diameter of the catheter body 1, and as shown in FIG. 2, when the balloon 3 'is deflated, the inner periphery of the balloon 3' is formed. You may comprise so that the whole surface may be in the state closely_contact | adhered to the outer peripheral surface of the catheter main body 1 and the cylindrical body 21. FIG. Since the configuration other than the above is the same as that of the balloon catheter A shown in FIG. 1, the same reference numerals are given and the description thereof is omitted.

  Here, the method of integrating the proximal end of the cylindrical body constituting the balloon into the catheter body 1 and the distal end of the cylindrical body into the outer peripheral surface of the cylindrical body 21 is not particularly limited, and heat fusion is performed. , A method using an adhesive, a method of binding both open ends of a cylindrical body with a thread, and the like.

  The material constituting the balloon 3 is not particularly limited. For example, natural rubber; silicone rubber; urethane rubber; thermoplastic elastomer such as polyolefin elastomer, polystyrene elastomer, polyamide elastomer; polyethylene, polypropylene, ethylene- Polyolefin resins such as ethylene-α-olefin copolymers such as propylene copolymers and propylene-α-olefin copolymers; ethylene-vinyl acetate copolymers, soft polyvinyl chloride, polyurethane, polyisoprene, etc. Natural rubber, silicone rubber, and urethane rubber are preferred because the balloon can be easily expanded and contracted in the living body cavity.

  As shown in FIG. 1, the balloon 3 is in a completely contracted state, that is, in a normal state, the opposed surfaces of the catheter body 1 and the tubular body 21 are completely in contact with each other over the entire circumference. Thus, the slide member 2 is completely accommodated in the catheter body 1 and the tubular body 21, while the fluid supplied through the lumen 11 of the catheter body 1 as shown in FIGS. 4 and 5. Is supplied into the balloon 3 through the fluid supply port 21a of the cylindrical body 21 and the balloon 3 is inflated, the slide member 2 gradually protrudes from the distal end opening of the catheter body 1 as the balloon 3 expands. The tubular body 21 and the catheter body 1 are configured to be separated from each other.

  Next, how to use the balloon catheter A will be described. In the following, an example will be described in which the balloon catheter A is used to expand a stenosis in a living body cavity such as a blood vessel, trachea, or digestive tract.

  First, the balloon catheter A is inserted into the living body cavity, and the distal end portion of the balloon catheter A is positioned in the narrowed portion of the living body cavity. At this time, when the balloon 3 of the balloon catheter A is deflated, the opposing surfaces of the catheter body 1 and the tubular body 21 are in close contact with each other, and the slide member 2 is further in contact with the catheter body 1. The proximal end portion is fixed to the outer peripheral surface of the distal end portion of the catheter body 1 and the distal end portion is fixed to the outer peripheral surface of the distal end portion of the cylindrical body 21. The balloon 3 is not deflated in the length direction and swelled in the radial direction, and the balloon catheter A is smoothly inserted into the living body cavity of the patient while the outer diameter of the balloon 3 is maintained at the minimum diameter. Can do.

  Next, fluid is supplied into the balloon 3 of the balloon catheter A through the lumen 11 of the catheter body 1, the slide member 2, and the fluid supply port 21 a of the cylindrical body 21. Then, as shown in FIG. 3, the balloon 3 has its tip portion, specifically, a portion in the vicinity of the fluid supply port 21a of the cylindrical body 21 gradually in the radial direction as the fluid flows in. Inflate. When the distal end portion of the balloon 3 is inflated to the vicinity of the expansion limit, an excessive inflating force is required for further expansion of the distal end portion of the balloon 3, so that as shown in FIG. The inflowing fluid increases the amount of inflow toward the proximal end side of the balloon 3.

  Then, as the amount of fluid flowing in the length direction of the balloon 3 increases, the balloon 3 begins to expand while expanding in the length direction, and the catheter body 1 follows the expansion of the balloon 3 in the length direction. The slide member 2 accommodated in the tube gradually protrudes from the distal end opening of the catheter body 1 and is separated from each other while maintaining the state where the cylindrical body 21 and the catheter body 1 are connected via the slide member 2. Go.

  The distance between the catheter body 1 and the cylindrical body 21 allows the balloon 3 to be smoothly elongated in the length direction, and the balloon 3 can be stretched substantially uniformly over the entire length in the length direction.

  Accordingly, a part of the balloon 3 extends excessively, and a weak part having a thin film thickness is partially generated. The fluid pressure is concentrated on the weak part, and the weak part expands excessively as compared with other parts. As a result, the balloon 3 expands substantially uniformly over the entire length in the longitudinal direction without partially forming the weak body portion (see FIG. 5).

  The separation between the catheter body 1 and the tubular body 21 is performed in synchronization with the degree of expansion of the balloon 3, so that the separation between the catheter body 1 and the tubular body 21 is delayed with respect to the inflation of the balloon 3. The expansion of the balloon 3 is prevented, or the separation between the catheter body 1 and the tubular body 21 precedes the expansion of the balloon 3, and the balloon 3 is forcibly extended in the length direction thereof, so that the balloon 3 is wrinkled. An unexpected situation does not occur in which the balloon 3 is not inflated smoothly.

  Therefore, in any state from the deflated state to the fully inflated state, the balloon 3 is surely inflated into a predetermined shape almost uniformly without wrinkles or deforming in part. To do.

  When the balloon 3 of the balloon catheter A is deflated, the fluid in the balloon 3 may be discharged to the outside through the fluid supply port 21 of the cylindrical body 21, the slide member 2, and the lumen 11 of the catheter body 1. Then, the slide member 2 slides into the distal end opening of the catheter body 1 in synchronization with the contraction of the balloon 3, and the slide member 2 has a portion other than the distal end to which the cylindrical body 21 is fixed. The proximal end surface of the cylindrical body 21 and the distal end opening end surface of the catheter body 1 are joined to each other, and the balloon 3 is restored to its original contracted state. In order to adjust the degree of expansion of the balloon 3 of the balloon catheter A, the amount of fluid supplied into the balloon 3 may be adjusted as described above.

  In this way, by supplying or discharging the fluid from outside the living body through the catheter body 1 into the balloon 3 of the balloon catheter A, the balloon 3 of the balloon catheter A can be inflated and contracted into a predetermined shape with high accuracy and reliability. Treatment can be performed smoothly without burdening the patient.

  Further, in the balloon catheter A, the balloon catheter A may be provided with a detachment preventing means 4 so that the slide member 2 is not completely removed from the proximal end opening of the catheter body 1.

  Such a detachment prevention means 4 includes the structure shown in FIG. That is, the radial thickness of the catheter main body 1 is reduced so that the inner diameter of the catheter main body 1 is larger than the outer diameter of the slide member 2, and the inner diameter of the catheter main body 1 toward the inner end of the distal end opening is increased. Is provided with a ring-shaped locking portion 12 having a constant width substantially matching the outer diameter of the slide member. On the other hand, a ring-shaped flange portion 22 having a constant width whose outer diameter matches the substantially inner diameter of the catheter body 1 protrudes outwardly from the proximal end opening edge of the slide member 2. When the slide member 2 protrudes from the proximal end opening of the catheter body 1, as shown in FIG. 7, the ring-shaped locking portion 12 of the catheter body 1, the ring-shaped flange portion 22 of the slide member 2, Are configured such that the slide member 2 is completely detached from the proximal end opening of the catheter body 1 and the slide member 2 is not detached from the catheter body 1. Good. Except for the above, the configuration is the same as that of the balloon catheter A shown in FIG.

  Further, in the balloon catheter A, the case where the cylindrical body 21 is integrally fitted to the distal end portion of the slide member 2 and the distal end portion of the balloon 3 is integrally fixed to the outer peripheral surface of the cylindrical body 21 will be described. However, as shown in FIG. 8, the tip of the balloon 3 is directly fixed and integrated with the outer peripheral surface of the tip of the slide member 2 without fitting the cylindrical body 21 to the slide member 2. There may be. In such a case, the distal end opening of the slide member 2 is completely closed, and the fluid supply port 23 communicating with the inside of the balloon 3 penetrates between the inner and outer peripheral surfaces at the distal end of the slide member 2. It is penetrated by. Except for the above, the configuration is the same as that of the balloon catheter A shown in FIG.

  Further, FIG. 8 illustrates the case where the slide member 2 is formed to have the same outer diameter over the entire length, but as shown in FIG. 9, the distal end of the catheter body 1 is in a state where the balloon 3 is completely deflated. The distal end portion of the slide member 2 protruding from the end portion may be an enlarged head 24 having an annular cross section having the same outer diameter as the outer diameter of the catheter body 1 over its entire length. The enlarged head 24 is provided with a fluid supply port 25 penetrating between the inner and outer peripheral surfaces thereof, so that the balloon 3 and the slide member 2 are in communication with each other. Note that the enlarged head 24 only needs to have the same outer diameter as the outer diameter of the catheter body 1. For example, the thickness of the slide member 2 is uniform over the entire length thereof, and the distal end portion of the slide member 2 is formed. The enlarged head portion 24 may be formed by expanding the diameter of.

  When the balloon 3 is completely deflated, the proximal end surface of the enlarged head 24 of the slide member 2 and the distal end surface of the catheter body 1 are in contact with each other over the entire circumference, and the slide member 2 is in contact. And the outer peripheral surface of the joint portion between the enlarged head 24 and the enlarged head 24 are flush with each other to form a smooth joint surface. In addition, about the same structure part as the balloon catheter A shown in FIG. 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The balloon catheter of the present invention can inflate the balloon as a whole, expand the stenosis and maintain the expanded state, exfoliate the tissue and maintain the exfoliated state, and lift or lift the tissue. The state can be maintained smoothly and can be used for various treatments or diagnoses.

It is the longitudinal cross-sectional view which showed the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed one form of the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed one form of the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed one form of the use condition of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed the state which expanded the balloon of the balloon catheter of FIG. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention. It is the longitudinal cross-sectional view which showed another example of the balloon catheter of this invention.

Explanation of symbols

1 Catheter body 2 Slide member 3 Balloon 4 Removal prevention means
11 lumens
12 Ring-shaped locking part
21 Tubular body
21a Fluid supply port
22 Ring-shaped flange
23 Fluid supply port A Balloon catheter

Claims (7)

A catheter body, a slide member disposed at a distal end portion of the catheter body and slidable in a length direction of the catheter body; a proximal end portion fixed to the distal end portion of the catheter body; and a distal end of the slide member A balloon catheter comprising a balloon capable of being inflated and deflated, wherein a distal end portion is fixed to the portion. A cylindrical body fitted to the distal end portion of the slide member is provided, the proximal end portion of the slide member is inserted into the distal end portion of the catheter body, and the distal end portion of the balloon is fixed to the outer peripheral surface of the cylindrical body. The balloon catheter according to claim 1, wherein The balloon catheter according to claim 2, wherein the balloon and the catheter main body are in contact with each other in a deflated state of the balloon. The structure according to claim 3, wherein an outer peripheral surface of a joint portion between the tubular body and the catheter body is flush with the tubular body and the catheter body in contact with each other. Balloon catheter. The balloon catheter according to claim 1, further comprising a detachment preventing means for preventing the slide member from detaching from the catheter body. A locking portion projecting inward from the distal end opening of the catheter body, and a flange projecting outward from the proximal end portion of the slide member and detachably locked to the locking portion The balloon catheter according to claim 1, further comprising: a portion. An enlarged head is formed at the distal end of the slide member, the proximal end of the slide member is inserted into the distal end of the catheter body, and the distal end of the balloon is fixed to the outer peripheral surface of the enlarged head of the slide member. The balloon catheter according to claim 1, wherein

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