JP5135816B2 - Balloon catheter for stone removal - Google Patents

Description

  The present invention relates to a calculus-removing balloon catheter used for removing a calculus generated in, for example, a bile duct.

  Several methods are known as methods for removing and removing stones generated in the bile duct, that is, gallstones outside the body, and one of them is a method using a balloon catheter. When removing gallstones from the bile duct using a balloon catheter, first, insert the balloon catheter with the balloon deflated through the endoscope into the bile duct, and then go deeper than the position of the gallstone where the balloon should be removed. To be located. Next, when the balloon is inflated and the balloon catheter is pulled back, the gallstone can be scraped out by the balloon and discharged out of the bile duct.

  As the calculus removing balloon catheter used for removing gallstones as described above, for example, those having the structures described in Patent Document 1 and Patent Document 2 are known. In the balloon catheter described in these documents, a cylindrical balloon made of a stretchable material is joined to the distal end portion (distal end portion) of the catheter tube. By introducing a fluid into the balloon, The balloon can be inflated.

  In such a conventional calculus removing balloon catheter, in order to remove the calculus, there is a disadvantage that the calculus easily escapes from the inflated balloon when the catheter is pulled out so as to scrape the calculus at the inflated balloon portion.

  As shown in Patent Document 3 below, a structure in which a balloon is eccentrically attached to a catheter is known for the purpose of changing the bending angle of the distal end of the catheter.

However, simply attaching the balloon eccentrically with respect to the catheter does not eliminate the inconvenience that the calculus easily escapes from the inflated balloon when the catheter is pulled out so as to scrape the calculus with the inflated balloon.
Japanese Utility Model Publication No. 5-63551 JP-A-6-210001 JP-A 64-15063

  The present invention has been made in view of such a situation, and when a catheter is pulled out so as to scrape a calculus with an inflated balloon, the calculus does not escape from the inflated balloon, and a calculus removing balloon catheter excellent in calculus removal characteristics is provided. The purpose is to provide.

In order to achieve the above-mentioned object, a balloon catheter for stone removal according to the present invention is:
A catheter tube having a distal end and a proximal end;
A calculus removing balloon catheter having a cylindrical balloon attached to a distal end of the catheter tube,
The balloon has a joint portion joined to the outer peripheral surface of the catheter tube, and an inflatable portion that can be inflated by introducing a fluid into the internal space,
At least a part of the balloon in the circumferential direction is provided with an eccentric inflation means so that the balloon inflating portion swells eccentrically with respect to the axis of the catheter tube .
The eccentric expansion means is a fixing tape for fixing a part of the balloon in the circumferential direction from above the balloon along the longitudinal direction of the balloon to the catheter tube,
Expansion of the balloon is restricted at the balloon portion to which the fixing tape is fixed, and the balloon expands eccentrically with respect to the axis of the catheter tube, and has a maximum bulge on the opposite side of the fixing tape. It is characterized by that.

  In the calculus removing balloon catheter according to the present invention, by pulling out the catheter tube toward the proximal end side, it is easy to scrape the calculus at the proximal end side of the maximum bulge portion in the balloon inflated eccentrically. Moreover, since the eccentric expansion means tries to maintain the eccentric expansion state, the calculus does not escape from the inflated balloon, and the calculus removal characteristics are excellent.

The eccentric expansion means is a fixing tape for fixing a part of the balloon in the circumferential direction from above the balloon along the longitudinal direction of the balloon to the catheter tube. Thus , after the balloon is attached to the catheter tube according to a standard method, the fixing tape is attached along the longitudinal direction from above the balloon, and the both ends of the tape are fixed to the catheter tube, and the eccentric balloon Can be created.

  Inflation is restricted in the balloon part to which the fixing tape is applied. Even if the calculus comes into contact with the proximal end of the largest inflated part of the balloon inflated eccentrically and the reaction force acts, the inflated balloon There is no escape space for the fluid inside, trying to maintain an eccentric expansion state. For this reason, the calculus does not escape from the inflated balloon, and the calculus removal property is excellent.

Or the said eccentric expansion | swelling means may further have the contact bonding layer for fixing a part of the circumferential direction of the said balloon with respect to the said catheter tube along the longitudinal direction of the said balloon. In this case, when the balloon is attached to the catheter tube, an adhesive is applied along the longitudinal direction in a part of the circumferential direction of the catheter tube, and a part of the balloon in the circumferential direction is applied along the longitudinal direction. By simply adhering to the tube, an eccentric balloon inflation state can be created. In the present invention, the adhesive layer is used in a concept including a heat-sealing layer. That is, instead of using an adhesive, a part of the balloon in the circumferential direction may be fixed to the catheter tube along the longitudinal direction by heat fusion.

  In the balloon part provided with the adhesive layer, the inflation is restricted, so even if a stone touches the proximal end of the largest inflated part in the eccentric inflated balloon and a reaction force acts on the balloon part in the inflated balloon, There is no escape space for fluid, and it tries to maintain an eccentric expansion state. For this reason, the calculus does not escape from the inflated balloon, and the calculus removal property is excellent.

Alternatively, the eccentric inflating means has a long support member having one end connected to a part of the balloon in the circumferential direction and the other end connected to a part of the catheter tube located on the proximal end side of the balloon. May be further included .

  In the balloon portion to which the long support member is connected, the balloon is inflated by being pulled by the long support member, so that an eccentric balloon inflated state can be created. In addition, because the balloon is inflated by being pulled by the long support member, even if the stone touches on the proximal end side of the largest bulge part in the eccentric inflated balloon, the reaction force acts on the long support. It is received by the member and tries to maintain an eccentric expansion state. For this reason, the calculus does not escape from the inflated balloon, and the calculus removal property is excellent.

Further, since the long support member is provided at the proximal end of the maximum bulge portion in the eccentrically inflated balloon, the long support member also functions as a basket effect of the calculus, and the calculus gripping effect is improved. Preferably, the long support member is inclined at an angle of 10 to 45 degrees with respect to a line parallel to the axis of the catheter tube, and the long support member is a proximal end of the maximum bulge portion of the balloon. Is provided.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is a schematic perspective view of a calculus removing balloon catheter according to an embodiment of the present invention.
FIG. 2 is a schematic longitudinal sectional view of the balloon catheter for calculus removal shown in FIG.
3 is a cross-sectional view taken along line III-III shown in FIG.
FIG. 4 is a schematic perspective view of a calculus removing balloon catheter according to another embodiment of the present invention,
FIG. 5 is a schematic perspective view of a balloon catheter for calculus removal according to still another embodiment of the present invention,
FIG. 6 is a schematic longitudinal sectional view of the balloon catheter for stone removal shown in FIG.
FIG. 7 is a transverse sectional view taken along line VII-VII shown in FIG.
FIG. 8 is a transverse cross section of a balloon in a calculus removing balloon catheter according to another embodiment of the present invention.
First embodiment

  As shown in FIGS. 1 and 2, a calculus removing balloon catheter 1 according to an embodiment of the present invention includes a catheter tube 5 and a balloon 2. The catheter tube 5 is a tube formed of a flexible material, and includes a distal end portion 7 which is an end portion to be inserted into the body and a proximal end portion (not shown) located on the other end side. And have. The outer diameter d1 of the catheter tube 5 is usually 1.0 to 3.0 mm, and the total length is usually 500 to 2500 mm.

  The material of the catheter tube 5 is not particularly limited as long as it is a flexible material, but is preferably a polymer material, and particularly preferably a polyamide resin or a polyamide-based elastomer.

  As shown in FIG. 2, a balloon lumen 8, a contrast medium lumen 9, and a guide wire lumen 10 are formed inside the catheter tube 5. The balloon lumen 8 is a lumen serving as a flow path for sending a fluid such as air used to inflate the balloon 2 to the internal space 24 of the balloon 2. The balloon lumen 8 extends from the proximal end of the catheter tube 5 to the middle of the distal end portion 7 of the catheter tube 5, and a fluid outlet 11 provided so as to open to the internal space 24 of the balloon 2. Conducted.

  The contrast medium lumen 9 is a lumen used as a contrast medium channel when performing X-ray contrast in the body for the purpose of confirming the position of the calculus. The contrast medium lumen 9 penetrates from the proximal end of the catheter tube 5 to the spout 12 at the distal end 7 of the catheter tube 5. The spout 12 is an opening provided so as to be positioned closer to the proximal end than the balloon 2. The spout may be an opening provided so as to be located on the distal end side of the balloon 2.

  The guide wire lumen 10 is a lumen through which the guide wire is inserted when the calculus removing balloon catheter 1 is inserted into the body along the guide wire. The guide wire lumen 10 is inserted from the proximal end of the catheter tube 5 to the distal end opening 10a. It penetrates to. In the catheter tube 5, the contrast medium lumen and the guide wire lumen 10 are not necessarily provided, and other lumens having functions other than the functions described above can be formed.

The cross-sectional shapes of the balloon lumen 8, the contrast medium lumen 9, and the guide wire lumen 10 are not limited, and may be shapes that can be efficiently arranged in the catheter tube 5. However, the guide wire lumen 10 preferably has a circular cross-sectional shape. The cross-sectional area of the balloon lumen 8 is 0.03 to 0.3 mm ² , the cross-sectional area of the contrast medium lumen 9 is 0.08 to 0.8 mm ² , and the cross-sectional area of the guide wire lumen 10 is 0.5 to It is preferably 1.0 mm ² respectively.

  The balloon 2 of the calculus removing balloon catheter 1 is attached to the distal end portion of the catheter tube 5 so as to cover the fluid outlet 11. The balloon 2 is formed of a stretchable material, and is inflated by introducing a fluid into the inside through a balloon lumen 8 of the catheter tube 5. The inflated balloon 2 can scrape or extrude the calculus to remove the calculus in the body.

  The stretchable material forming the balloon 2 is preferably one having a 100% modulus (measured in accordance with JIS K 6251) of 0.1 to 10 Mpa, particularly preferably 1 to 5 Mpa. If the 100% modulus is too small, the strength of the balloon 2 may be insufficient. If it is too large, the balloon 2 may not be expanded to a sufficient size. Specific examples of the stretchable material suitable for forming the balloon 2 include natural rubber, silicone rubber, polyurethane elastomer, and the like.

  As shown in FIGS. 1 to 3, the balloon 2 has a tubular shape as a whole, and joint portions 4 a and 4 b that are joined to the outer peripheral surface of the catheter tube 5 are formed at both ends thereof.

  The shape of the joint portions 4a and 4b located on both ends of the inflatable portion 3 of the balloon 2 is not particularly limited as long as it is a shape that can be joined to the distal end portion 7 of the catheter tube 5, but is preferably cylindrical. . When the joint portions 4a and 4b of the balloon 2 are cylindrical, the inner diameter is preferably substantially equal to the outer diameter of the catheter tube 5, and the length is preferably 0.5 to 5 mm. Further, the thickness of the joint portion 4 of the balloon 2 is not particularly limited, and may be, for example, substantially equal to the inflatable portion 3. The method for joining the joint 4 of the balloon 2 and the distal end 7 of the catheter tube 5 is not particularly limited. For example, bonding with an adhesive, thermal fusion, welding with a solvent, ultrasonic welding, etc. Can be mentioned.

  In the balloon 2, an inflatable portion 3 that is inflated by introducing a fluid into the internal space 24 is formed between the joint portions 4 a and 4 b. 1-3, an inflated balloon 2 is shown.

  The inflatable portion 3 of the balloon 2 preferably has a maximum outer diameter in the inflated state of 110 to 200% of the minimum outer diameter in the deflated state. If this ratio is too small, the balloon 2 may not expand to a sufficient size, and if it is too large, the balloon 2 may become an obstacle when the calculus removing balloon catheter 1 is inserted into the body. Further, the length of the inflatable portion 3 in the balloon 2 (the length along the axial direction of the catheter tube 5) is preferably 5 to 20 mm, and the wall thickness is preferably 0.10 to 0.50 mm. The wall thickness of the balloon 2 is preferably uniform along the circumferential direction.

  A method for manufacturing the balloon 2 having the shape as described above is not particularly limited, and a known method may be used as a method for forming the stretchable material, but it is preferable to use a dipping method. In the dipping molding method, a stretchable material and various additives as necessary are dissolved in a solvent to form a solution or suspension, and a mold having an outer shape substantially equal to the desired balloon shape is formed in this solution (suspension). It is immersed and a solution (suspension) is applied to the surface of the mold, and the solvent is evaporated to form a film on the surface of the mold. By repeating this immersion and drying, a balloon having a desired thickness can be formed. Depending on the type of stretchable material, crosslinking is performed after film formation, if necessary.

  In the present embodiment, a fixing tape 20 for fixing a part of the balloon 2 in the circumferential direction to the catheter tube 5 is attached from above the balloon 2 along the longitudinal direction of the balloon 2. The fixing tape 20 is longer than the axial length of the balloon 2, and both ends 22 a and 22 b of the tape 20 are fixed to the outer peripheral surface of the catheter tube 5.

  The material of the fixing tape 20 is not particularly limited, and is made of the same resin as that constituting the catheter tube 5. A method for fixing both ends of the fixing tape 20 is not particularly limited, and examples thereof include adhesion, heat fusion, and high frequency fusion. For example, in the case of the bonding method, an adhesive (adhesive) is applied to the back surface of the tape 20 so as to adhere to a part of the balloon 2 in the circumferential direction and a part of the catheter tube 5.

  The width of the fixing tape 20 is a width equal to or less than ½ of the circumferential length on the outer periphery of the catheter tube 5, and preferably a width of 1/3 to 1/5. If the width is too small, the function of fixing a part of the balloon 2 in the circumferential direction from the top of the balloon 2 to the catheter tube 5 becomes small. If the width is too large, the balloon 2 is eccentric and inflated. Becomes difficult.

  In this embodiment, since the fixing tape 20 for fixing a part of the balloon 2 in the circumferential direction to the catheter tube 5 is attached from above the balloon 2, as shown in FIG. The inflatable portion 3 expands eccentrically with respect to the axis of the catheter tube 5. The eccentric amount h1 of the expansion center of the expansion part 3 with respect to the axis of the catheter tube 5 is preferably 50 to 100%, more preferably 75 to 100% with respect to the expansion radius R of the expansion part 3. The balloon 2 does not need to be completely inflated in the cross section, and may be inflated into an elliptical shape or other shapes.

  Next, an example of removing gallstones from the bile duct will be described as an example of use of the calculus removal balloon catheter 1 of the present embodiment.

  First, the guide wire is inserted into the guide wire lumen 10 from the distal end side (not shown) of the calculus removing balloon catheter 1 with respect to the proximal end of the guide wire previously inserted into the bile duct through the channel of the endoscope. After the catheter is inserted, the distal end side of the catheter tube 5 is inserted from the distal end side of the catheter tube 5 into the bile duct along the guide wire from the distal end side of the catheter tube 5 without inflating the balloon 2. Insert.

  Next, the contrast medium is sent to the spout 12 through the contrast medium lumen 9 by a syringe or the like, the contrast medium is ejected, X-ray contrast in the bile duct is confirmed, and the state of the gallstone is confirmed. After the balloon 2 of the catheter 1 is pushed forward to the back side, air is sent into the balloon 2 through the balloon lumen 8 by a syringe or the like to inflate the balloon 2. At this time, in the present embodiment, the inflating portion 3 of the balloon 2 swells eccentrically.

  Subsequently, when the catheter 1 is pulled back while the balloon 2 is inflated, the gallstone can be scraped out of the bile duct from the duodenal papilla by the balloon 2. At this time, in the catheter 1 of the present embodiment, as shown in FIG. 2, the catheter tube 5 is pulled out toward the proximal end (in the direction of the arrow X in FIG. 2), thereby inflating the eccentric portion 3 of the balloon 2 eccentrically. It is easy to scrape the calculus 50 on the proximal end side of the maximum bulge portion.

  In the balloon portion to which the fixing tape 20 is attached, the expansion is restricted. Therefore, even if the calculus 50 comes into contact with the proximal end side of the maximum inflated portion of the balloon 2 that is eccentrically inflated, There is no escape space for the fluid in the inflated balloon, trying to maintain an eccentric inflated state. For this reason, the calculus does not escape from the inflated balloon 2, and the calculus removal property is excellent.

  In this embodiment, after attaching the balloon 2 to the catheter tube 5 according to a conventional method, the fixing tape 20 is attached along the longitudinal direction from above the balloon 2, and both ends 22a and 22b of the tape 20 are connected to the catheter tube. An inflated balloon inflated state can be created simply by gluing and fixing to 5. That is, the manufacture of the calculus removing balloon catheter 2 is very easy.

In the present invention, in the embodiment shown in FIGS. 1 to 3, the inside of the balloon 2 corresponding to the width of the fixing tape 20 is used without using the fixing tape 20 or together with the fixing tape 20. 5 may be fixed to the outer peripheral surface of the catheter tube 5 by means such as adhesion or fusion along the longitudinal direction. That is, a part of the balloon 2 in the circumferential direction may be fixed to the catheter tube 5 via an adhesive layer along the longitudinal direction of the balloon 2. Also in this case, the same effects as those of the above-described embodiment can be obtained.
Second embodiment

  In the second embodiment shown in FIG. 4, as shown below, a calculus removing balloon catheter is provided in the same manner as in the first embodiment except that a pair of long support members 30 and 32 are further added. 1a is constituted. In this embodiment, one end joint portions 30a and 32a of the respective long support members 30 and 32 are connected to a part of the circumferential direction of the inflatable portion 3 in the balloon 2 which is eccentrically inflated, and the other end joint portion 30b and 32 b is connected to a part of the catheter tube 5 located on the proximal end side of the balloon 2.

  The long support members 30 and 32 are not particularly limited, but may be in various forms such as monofilament yarns, twisted yarns, tape-like yarns, wires, rods, flat plates, etc., but preferably monofilament yarns and tape-like yarns. It is preferable that The material of the long support members 30 and 32 is not particularly limited as long as it is excellent in moderate flexibility and strength. For example, it is composed of polyamide resin, polyamide elastomer, olefin resin, polyvinyl chloride, or the like. .

  In this embodiment, two long support members 30 and 32 are used, and the respective one-end joint portions 30a and 32a are different at the same position along the axial direction of the tube 5 and in the circumferential direction of the expansion portion 3. In position, it is joined to the inflatable part 3 of the balloon 2. Further, the other end joint portions 30 b and 32 b of the long support members 30 and 32 are joined to the tube 5 at the same position along the axial direction of the tube 5 and at different positions in the circumferential direction of the tube 5. It is. The lengths of the long members 30 and 32 are substantially the same in this embodiment.

  In this embodiment, the two long support members are arranged so that the two long support members 30 and 32 are stretched to some extent even when the inflated portion 3 of the balloon 2 is inflated or deflated. It is preferable that the lengths 30 and 32 and the joining positions are adjusted.

  Moreover, in this embodiment, in a state where the inflating portion 3 of the balloon 2 is inflated, the two long support members 30 and 32 are preferably 10 to 45 with respect to the line L1 parallel to the axis of the tube 5. The lengths and joining positions of the two long support members 30 and 32 are adjusted so as to be inclined at an angle of degrees.

  In the calculus removing balloon catheter 1a according to the second embodiment, the balloon part to which the long support members 30 and 32 are connected is pulled by the long support members 30 and 32 and inflated, so that the eccentric balloon 2 Can be created. Even if the calculus 50 comes into contact with the proximal end of the maximum inflated portion of the balloon 2 which is eccentrically inflated because it is pulled by the long support members 30 and 32 and expands, the reaction force acts on the reaction force. The force is received by the long support members 30 and 32 and tries to maintain an eccentric expansion state. For this reason, the calculus 50 does not escape from the inflated balloon 2 and the calculus 50 removal characteristics are excellent.

  Furthermore, since the long support members 30 and 32 are provided at the proximal end of the maximum bulge portion in the balloon 2 that is eccentrically inflated, the long support members 30 and 32 also function as a basket effect of the calculus 50. The gripping effect is improved. Other functions and effects of the balloon catheter 1a according to the present embodiment are the same as those of the first embodiment described above.

  In the present invention, the number of the long support members 30 and 32 is not limited to two, and may be one or three or more. In addition, the one end joint portions 30a and 32a of the long support members 30 and 32 do not necessarily have to be joined to the balloon 2 at the same position along the axial direction of the tube 5, but at different positions along the axial direction, It may be joined to the balloon 2. Further, the one end joint portions 30a, 32a of the long support members 30, 32 are not necessarily joined to the balloon 2 at different positions along the circumferential direction of the balloon 2, but at the same position along the circumferential direction. It may be joined to.

Similarly, the other end joint portions 30b and 32b of the long support members 30 and 32 do not necessarily have to be joined to the tube 5 at the same position along the axial direction of the tube 5, but along the axial direction. You may join to the tube 5 in a different position. Further, the other end joining portions 30b and 32b of the long support members 30 and 32 do not necessarily have to be joined to the tube 5 at different positions along the circumferential direction of the tube 5, but at the same position along the circumferential direction. 5 may be joined.
Third embodiment

  In the third embodiment shown in FIGS. 5 to 7, as shown below, a calculus removing balloon catheter is obtained in the same manner as in the second embodiment except that the fixing tape 20 shown in FIG. 4 is not provided. 1b is constituted. In this embodiment, the eccentric expansion part 3 of the balloon 2 is realized only by the long support members 30 and 32 without using the fixing tape 20 shown in FIG. Specifically, the lengths of the long support members 30 and 32, the joining positions of the one end joint portions 30a and 32a and the other end joint portions 30b and 32b, and the angle θ of the long support members 30 and 32 are adjusted. Thus, the eccentric expansion part 3 of the balloon 2 is realized.

The balloon catheter 1b according to this embodiment has the same effects as those of the second embodiment described above except that the fixing tape 20 shown in FIG. 4 is not provided.
Fourth embodiment

  In the embodiment shown in FIG. 8, in the cross section of the balloon 2a, the thickness is changed along the circumferential direction, and the long support members 30 and 32 shown in FIGS. 5 and 6 are not used. The calculus removing balloon catheter is constructed in the same manner as the third embodiment shown in FIG. In this embodiment, without using the long support members 30 and 32 shown in FIG. 5 and FIG. 6, the balloon 2a is simply changed in thickness along the circumferential direction in the cross section of the balloon 2a. The eccentric expansion part 3a is realized. Specifically, in the cross section of the balloon 2a, along the circumferential direction of the balloon membrane, a thick portion 42 and a thin portion 40 of the balloon membrane are formed to realize the eccentric expansion portion 3 of the balloon 2. .

  That is, in the portion 40 where the balloon membrane is thin, the balloon 2a is greatly inflated as compared with the portion 42 where the balloon membrane is thick, so that the balloon 2a can be inflated eccentrically with respect to the catheter tube 5 as a whole. become.

  The balloon catheter according to the present embodiment does not have the fixing tape 20 shown in FIG. 4 and does not use the long support members 30 and 32 shown in FIGS. 5 and 6. The same effect is produced.

However, in this fourth embodiment, since the eccentric state of the balloon 2a is maintained only by the thickness change in the circumferential direction of the balloon membrane, in terms of the effect of gripping stones and scraping effect by the eccentric balloon, The first to third embodiments are excellent. Another problem is that the balloon 2a having a thickness change in the circumferential direction is difficult to make.
Other embodiments

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

  For example, in the above-described embodiment, the calculus removal balloon catheter 1 includes one balloon, but may include a plurality of balloons, and at least one of them may be a balloon having the shape described above.

  Moreover, the balloon catheter 1 for stone removal of this invention should just be used in order to remove a stone from a body, and is not limited to the removal use of a gallstone.

FIG. 1 is a schematic perspective view of a calculus removing balloon catheter according to an embodiment of the present invention. FIG. 2 is a schematic longitudinal sectional view of the calculus removing balloon catheter shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. FIG. 4 is a schematic perspective view of a calculus removing balloon catheter according to another embodiment of the present invention. FIG. 5 is a schematic perspective view of a calculus removing balloon catheter according to still another embodiment of the present invention. 6 is a schematic longitudinal sectional view of the calculus removing balloon catheter shown in FIG. FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG. FIG. 8 is a transverse cross section of a balloon in a calculus removing balloon catheter according to another embodiment of the present invention.

Explanation of symbols

1, 1a, 1b ... Balloon catheter for stone removal 2, 2a ... Balloon 3, 3a ... Expansion part 4a, 4b ... Joint part 5 ... Catheter tube 8 ... Balloon lumen 9 ... Contrast medium lumen 10 ... Guide wire lumen 11 ... Fluid guide Exit 12 ... Spout 20 ... Fixing tape 30 ... Long support member 50 ... Stone

Claims (4)

A catheter tube having a distal end and a proximal end;
A calculus removing balloon catheter having a cylindrical balloon attached to a distal end of the catheter tube,
The balloon has a joint portion joined to the outer peripheral surface of the catheter tube, and an inflatable portion that can be inflated by introducing a fluid into the internal space,
At least a part of the balloon in the circumferential direction is provided with an eccentric inflation means so that the inflation portion swells eccentrically with respect to the axis of the catheter tube .
The eccentric expansion means is a fixing tape for fixing a part of the balloon in the circumferential direction from above the balloon along the longitudinal direction of the balloon to the catheter tube,
Expansion of the balloon is restricted at the balloon portion to which the fixing tape is fixed, and the balloon expands eccentrically with respect to the axis of the catheter tube, and has a maximum bulge on the opposite side of the fixing tape. A balloon catheter for calculus removal. The eccentric expansion means,
The balloon catheter for calculus removal according to claim 1, further comprising an adhesive layer for fixing a part of the balloon in the circumferential direction to the catheter tube along a longitudinal direction of the balloon. The eccentric expansion means,
The elongate support member further comprising one end connected to a part of the balloon in the circumferential direction and the other end connected to a part of the catheter tube located on the proximal end side of the balloon. The balloon catheter for calculus removal according to 1.   The long support member is inclined at an angle of 10 to 45 degrees with respect to a line parallel to the axis of the catheter tube;
  The balloon catheter for removing a calculus according to claim 3, wherein the long support member is provided at a proximal end of a maximum bulge portion of the balloon.

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