JP2000005189A - Catheter for removing foreign matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter for removing a foreign matter that can remove a foreign matter such as a calculus with one therapeutic means low-invasively without damaging tube's inner wall, even when objective foreign matter is relatively large. SOLUTION: This catheter has a catheter tube 12, a slide member movably inserted into a lumen of the catheter tube 12 in the axial line direction, an elastic body-made cylindrical balloon 16 whose one end is fixed to the tip of the catheter tube 12 and the other end is fixed to the tip of the slide member respectively so as to make the inside of a cylinder air-tight and liquid-tight, and a connection portion of a pressurizer for expanding and shrinking the balloon 16 by adjusting pressure in the cylinder of the balloon 16, and wraps a foreign matter 30 in an organism with the balloon 16 to remove it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a catheter tube for removing a foreign substance in a living body, and more specifically, for example, in a body cavity such as a heart, a blood vessel, a digestive tract, a urethra, an abdominal cavity and a living body. The present invention relates to a catheter for removing a foreign substance such as a calculus or a piece of tissue which can be inserted into a lumen artificially made in a tissue and can be carried out of the body in a minimally invasive manner.

[0002]

2. Description of the Related Art At present, highly invasive surgery is gradually being replaced by less invasive procedures. In particular, minimally invasive treatments based on endoscopes have been expanding dramatically.
Especially in urology, endoscopic treatment has the oldest history,
It is now an essential technology.

[0003] A major treatment of urology is the removal of stones such as kidney stones and ureteral stones. In recent years, stone removal has been
It is mainly performed by SWL (extracoporeal shock wave lithotripsy). Usually, PNL (percutaneous nephrolith) depends on the treatment site and case.
otripsy; percutaneous nephrolithotomy or TUL (trans ureth
ral lithotripsy (transurethral ureteral stone removal). In addition to urology, stone removal such as gallstones, common bile duct gallstones, and intrahepatic gallstones is also important in stone removal.

[0004] When these calculi are removed using an endoscope, mechanical crushing using forceps or crushing of calculi using energy such as laser, electric hydraulic shock wave, or ultrasonic waves may be performed. is there. With these techniques, the target stone is large, and if you try to forcibly trap and pull it out, the inner wall of the lumen may be damaged.Therefore, pulling out using forceps such as basket forceps or removing it by suction The first goal is to crush stones when it is not possible.

[0005]

In such a case, the treatment procedure becomes gradual, such as crushing and removal.
This puts a burden on the surgeon and the patient. Moreover, even a small foreign object or calculus may damage the inner wall of the lumen depending on the shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to perform a single operation without invasion and without damaging the inner wall of a lumen even if the target foreign matter is large. An object of the present invention is to provide a catheter for removing foreign matter such as a calculus which can be removed by a treatment technique.

[0007]

This and other objects are achieved by the present invention described below. That is, the present invention provides a catheter tube having at least one lumen,
Within the lumen of the catheter tube, a slide member that is movably inserted in the axial direction and a cylindrical shape made of an elastic body, one end of which is at the distal end of the catheter tube, and the other end is at the distal end of the slide member. A balloon which is fixed so that the inside of the cylinder can be air-tight or liquid-tight, and which allows the outer diameter of the maximum inflatable portion to be three times or more larger than the outer diameter at the time of deflation when inflated; And a connecting part for connecting a pressurizer for inflating and deflating the balloon, whereby a foreign matter in a living body is wrapped and removed by the balloon, and a foreign matter removing catheter is provided.

Another aspect of the present invention provides at least one
A catheter tube having two lumens, a slide member inserted movably in the axial direction into the lumen of the catheter tube, and a cylindrical member made of an elastic body, one end of which is at the distal end of the catheter tube, and the other end of which is at the other end. A balloon fixed to the tip of the slide member so that the inside of the cylinder can be air-tight or liquid-tight, and a pressurizer that expands and contracts the balloon by adjusting the pressure in the cylinder of the balloon are connected. A foreign matter removing catheter, comprising: a connecting portion; and a capturing means disposed at a distal end of the slide member for capturing foreign matter, wherein the balloon wraps and removes foreign matter in a living body.

In the foreign matter removing catheter of this aspect, the slide member preferably has a capturing means for capturing the foreign matter, and the capturing means is a means for sucking and capturing the foreign matter or a means for grasping and capturing the foreign matter. Preferably, the balloon has an outer diameter of a maximum inflatable portion at the time of inflation of at least three times the outer diameter at the time of deflation.

[0010] Such a foreign matter removing catheter of the present invention is inserted into a living body, and at least one end of the catheter tube and the slide member on the balloon fixing side is positioned near the foreign matter in the living body. With the pressurizer connected to the connection portion, the balloon is inflated and / or deflated, and further, the slide member and the foreign matter removal catheter body are moved in the axial direction, so that the foreign matter is wrapped and held by the balloon, and thereafter, The foreign matter is removed outside the living body by pulling out the foreign matter removing catheter.

Further, it is preferable that a bending function is added to the distal end portion of the catheter to provide directional selectivity, and that the distal end portion can be used while confirming the distal end portion by using an endoscope.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a catheter for removing foreign matter according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 shows an overall view of an example of the foreign matter removing catheter of the present invention. In the illustrated example, the foreign matter removing catheter (hereinafter, referred to as a catheter) 10 basically includes
Catheter tube 12, inner tube 14 as a slide member, balloon tube 16 fixed to one end of catheter tube 12 and inner tube 14, suction plate 18, catheter hub 20, catheter An opening 20b formed in the hub 20;
And a suction device 26. The pressurizer 22 for inflating and deflating the balloon tube 16 is provided with the opening 2.
0b. In the following description, the balloon tube 16 inserted into the living body is referred to as the distal end, and the opposite side is referred to as the proximal end. In each of the drawings, the proximal end is described as right and the distal end is described as left. .

FIG. 2 is a schematic sectional view of a distal end portion of the catheter 10 inserted into the body cavity 1. In the catheter 10 of the present invention, the catheter tube 12 has at least one lumen (in the illustrated example, one lumen 2).
It is a catheter tube having 8). The inner tube 14 which is a long tube is inserted into the lumen 28 of the catheter tube 12 movably in the axial direction (longitudinal direction) of the catheter tube 12.

Catheter tube 12 and inner tube 14
A balloon tube 16 which is a cylindrical elastic body is fixed to the distal end portion with the inside of the cylinder being airtight (depending on the pressurizing medium of the balloon tube 16, liquid-tight or less). More specifically, the balloon tube 16 is inserted into the inner tube 14 and the distal end of the catheter tube 12 in a state where the inner tube 14 protrudes from the catheter tube 12 toward the distal end, and the one end (the distal end) Side) is folded inside and the inner tube 1
4 is hermetically fixed over the entire circumference on the outer surface, and the other end is fitted with the distal end of the catheter tube 12,
It is airtightly fixed over the entire circumference of its outer surface. Therefore, the balloon tube 16 is pressurized by closing the proximal end side of the catheter tube 12 and introducing a fluid such as air into the gap between the lumen 28 and the inner tube 14 to pressurize the balloon tube 16. Can be inflated.
In the illustrated example, as a preferred embodiment, the balloon tube 16 has the tip on the side of the inner tube 14 folded back and fixed. Thereby, the balloon tube 16 can be inflated toward the distal end, and the foreign matter 30 such as a calculus can be appropriately wrapped by the balloon tube 16.

In the present invention, the fixed position of the balloon tube 16 is such that one end is the distal end of the catheter tube 12 and the other end is the distal end of the inner tube 14 (sliding member) so that the inside of the balloon tube 16 is airtight. If it is fixed as much as possible, it is not limited to the illustrated example. For example, one end of the balloon tube 16 may be inserted into the catheter tube 12 and fixed, or one end of the balloon tube 16 may be folded into the inner tube 14 and fixed. The end on the side may be fixed without being folded. The fixing method is not particularly limited, and various methods can be used as long as the airtight state can be maintained. For example, a method using an adhesive, a method using heat fusion, and the like are preferably exemplified.

In the illustrated catheter 10, an adsorbing plate 18, which constitutes a capturing means, is disposed at the tip of the inner tube 14. The suction plate 18 has a funnel-like shape that opens toward the distal end, and has a central through-hole 18a.
Is connected to the inner tube 14 and is fixed to the inner tube 14.
The suction plate 18 captures a foreign substance 30 such as a calculus in a sliver-like portion by a suction action of a suction device 26 described later.

FIG. 4 is a schematic sectional view of the catheter hub 20. The catheter hub 20 is a hollow member, and the proximal end of the catheter tube 12 has a lumen 28.
Is connected to the inside of the catheter hub 20 and is airtightly fixed. On the other hand, the inner cylindrical tube 14 penetrates the catheter hub 20 in the axial direction, and the proximal end portion is connected to the inner cylindrical tube hub 24.
Fixed to A sealing gasket (sliding bearing) 32 is arranged at a proximal end of the catheter hub 20. The sealing gasket 32 supports the inner tube 14 movably in the axial direction while keeping the inside of the catheter hub 20 airtight. Therefore, this allows the balloon tube 16,
A closed space including the gap between the lumen 28 and the inner tube 14 and the inside of the catheter hub 20 is formed.

In the catheter 10, the inner tube 14 is moved in the catheter tube 12 in the axial direction by moving the inner tube hub 24 relative to the catheter hub 20 in the axial direction. As described above, the distal end of the inner tube 14 can be housed in and protruded from the catheter tube 12.

If the inner tube 14 is housed in the catheter tube 12 more than necessary or unnecessarily protrudes from the catheter tube 12, a load is applied to the balloon tube 16 having both ends fixed to the distal ends thereof. In such severe cases, the balloon tube 16 may fall off or be damaged. Therefore, in the catheter 10 of the present invention, it is preferable to provide a means for restricting the axial movement of the inner tube 14 with respect to the catheter tube 12 within a predetermined range. The regulating means is not particularly limited. For example, a method of attaching a flange or a stopper to the catheter hub 20 and the inner tube 14 and / or the inner tube hub 24 by moving the inner tube 14 in the axial direction. Is exemplified. In addition, the catheter tube 12
For example, a scale for detecting the amount of protrusion or storage of the inner tube 14 with respect to the inner tube 14 may be provided on the surface of the inner tube 14, and further, the inside of the catheter tube 12 for preventing a large twist of the balloon tube 16. Means for regulating the amount of rotation relative to the cylindrical tube 14 may be provided.

The catheter hub 20 has a branch portion 20a.
Is formed at one end thereof, and an opening 20b for communicating the lumen 28 of the catheter tube 12 with the outside is formed. The opening 20b functions as a connecting part, and the pressurizer 22 is airtightly connected. The connection between the two may be performed by a known method. Further, the pressurizer 22 and the catheter hub 20 may be integrally formed. The pressurizer 22 is used to supply a fluid such as air to the catheter hub 2.
By introducing and / or discharging the inside of the catheter 10, the inside of the closed space is pressurized and depressurized to expand and contract the balloon tube 16 disposed at the distal end of the catheter 10. As the pressurizer 22, various types can be used as long as the balloon tube 16 can be expanded and contracted by pressurizing or depressurizing the closed space.
An electric or manual syringe (pressurized cylinder), an electric or manual pump or a blower equipped with a pressure release means, etc. can be suitably used. In the illustrated example, as an example,
A syringe is used as the pressurizer 22. Further, in order to prevent the balloon tube 16 from being unnecessarily expanded or ruptured, the pressurizer 22 may be provided with a means for limiting the pressing force by a known method such as a limiter or a pressure-sensitive valve. The fluid for inflating the balloon tube 16 is not particularly limited, and examples thereof include a gas such as air and an inert gas, and a liquid such as water and physiological saline.

As shown in FIG. 1, the inside of the inner tube 14 is connected to the suction device 26 via the inside of the inner tube hub 24 and the connecting tube 34. The suction device 26 is for sucking the foreign matter 30 on the suction plate 18 by sucking the inside of the inner cylindrical tube 14 and capturing the same. For example, a known device such as a manual or electric syringe, a suction pump, or a suction device is used. Is available, and a syringe is used as the suction device 26 in the illustrated example.

In the present invention, the balloon tube 16
Is preferably made of a material having a large compliance, and it is preferable that the outer diameter of the largest inflation portion when expanded is three times or more the outer diameter when contracted. As a preferred example, the material is an ethylene-based elastomer,
A tube having an outer diameter of 3 mm when contracted, a wall thickness of 300 μm, an outer diameter of 15 mm when expanded, and a length of 30 mm is exemplified. The elongation at break is preferably 2500%. Specifically, as shown in FIG. 5 (in FIG. 5, the suction plate 18 is omitted), the inner tube 14 is projected from the catheter tube 12 without loosening and extending the balloon tube 16. In the balloon tube 16, for example, 3a
When the outer diameter L when pressurized by about tm is contracted (when not expanded)
Has an expansion rate that is at least 3 times, preferably at least 5 times, especially at least 10 times the outer diameter l of L. In other words, L / l is 3 or more in FIG.
Since the balloon tube 16 has such characteristics, the foreign matter 3 from the living body can be obtained using the catheter of the present invention.
At the time of removing 0, it is possible to preferably form an expanded shape which advances forward as shown in FIG. 3 with respect to the body cavity wall by pressurization, so that the balloon tube 16 can suitably wrap the foreign matter 30.

The balloon tube 16 has an elongation at break of 900% to 3000% (JIS K6251),
In particular, it is preferable to use a material having physical properties of 1600% to 2500% (same). Further, the balloon tube 16
Has a tensile strength of 1 MPa to 40 MPa (JIS K6
251), particularly, a material having physical properties of 10 MPa to 35 MPa (same as above) is preferably used.

As a material for forming such a balloon tube 16, various materials capable of realizing the above characteristics can be used. Specifically, natural rubber, isoprene rubber,
Butadiene rubber, 1,2-polybutadiene, styrene-
Various rubbers such as butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, polysulfide rubber, silicone rubber, urethane rubber, styrene-based elastomer, polyamide-based elastomer, polyester-based elastomer, polyolefin-based elastomer, and polyurethane-based A polymer material having elasticity such as an elastomer or a thermoplastic elastomer such as a PVC elastomer is preferably exemplified. Among them, natural rubber, isoprene rubber, silicone rubber, urethane rubber and styrene-based elastomer are preferable, and styrene-based elastomer is particularly preferably used. Note that these materials may be used alone, or a material obtained by blending or copolymerizing these materials or other materials may be used.

The size of the balloon tube 16 is not particularly limited and may be appropriately determined according to the intended use of the catheter 10 of the present invention.
Is used for removal of ureteral stones by a transurethral approach, etc., formed of a styrenic elastomer, non-expanded outer diameter 3 mm, wall thickness 300 μm, expanded outer diameter 15-20 mm, Length 30mm, Tensile strength 10
Mpa is preferable.

Also, on the outer surface of the balloon tube 16,
It is preferable to coat with a hydrophilic lubricating substance in order to enhance the slidability with the inner surface of a living body lumen or the like. As the hydrophilic lubricating substance, a maleic anhydride copolymer, a cellulose-based polymer, an acrylamide-based polymer, and water-soluble nylon are suitable.

In the present invention, the catheter tube 12
Is formed of a material having a moderate flexibility and a sufficient rigidity against invasion into a living body, for example, soft polyvinyl chloride, polyethylene, polyethylene terephthalate, polyvinyl chloride, polyvinylene Formed of a polymer material such as polyurethane, polyamide, polytetrafluoroethylene, ethylene-vinyl acetate copolymer, silicone, and natural rubber. Note that the length and diameter of the catheter tube 12 are the same as those of the catheter 1 of the present invention.
What is necessary is just to determine suitably according to the use of 0.

In the present invention, the catheter tube 1
It is preferable that X-ray contrast is imparted so that No. 2 can be confirmed under X-ray fluoroscopy. As a method,
For example, a method of blending an X-ray opaque substance such as barium sulfate, bismuth oxide, or tungsten in the constituent material of the catheter tube 12, a method of embedding a marker using such an X-ray opaque substance or attaching the marker to the surface, or the like. Is exemplified. Such X-ray contrast may be provided only to the distal end of the catheter tube 12, or the balloon tube 16 or the inner tube 14 (whole or only the distal end) may be provided with X-ray contrast. Is also good.

Further, in order to improve the slidability in the body lumen or the like, for example, a hydrophilic polymer (for example, maleic anhydride copolymer) is provided on the outer surface of the catheter tube 12.
Or fluororesin (for example, polytetrafluoroethylene)
May be coated.

In the present invention, like the catheter tube 12, the inner tube 14 is desirably made of a material having a certain degree of flexibility.
It is preferably formed of a material having relatively hard physical properties, such as a fluororesin, polyethylene terephthalate, polyvinyl chloride, polyurethane, polyamide, polyimide, or a metal pipe such as stainless steel, titanium, or a Ni—Ti alloy. There is no particular limitation on the size and length of the inner tube 14, and depending on the use of the catheter 10 of the present invention and the length and diameter of the catheter tube 12 and the balloon tube 16,
It may be determined appropriately.

As described above, in the illustrated catheter 10, as a preferred embodiment, the distal end of the inner cylindrical tube 14 is
An adsorbing plate 18 as a means for capturing the foreign matter 30 is arranged. The material for forming the suction plate 18 is not particularly limited. For example, a flexible polymer material such as a styrene-based elastomer, natural rubber, or silicone rubber is preferably used.

The hub 20 for the catheter and the hub 24 for the inner tube are formed of a material having sufficient rigidity against the operation of the catheter 10 and the pressurization for inflation of the balloon tube 16. , Styrene-butadiene copolymer, silicone resin, ABS resin and the like. The sealing gasket 32 disposed on the catheter hub 20 is preferably made of a material that can keep the inside of the catheter hub 20 airtight and has excellent slidability with the outer periphery of the inner tube 14. , Polyisoprene, natural rubber, polybutadiene, polyurethane, polyvinyl chloride and the like are suitably used, and silicone, natural rubber and the like are particularly preferable.

Next, referring to FIGS. 2 and 3, an example of use of the illustrated catheter 10 will be described.

First, the pressurizer 22 is airtightly connected to the opening 20b. Subsequently, as shown in FIG. 2, in a state where the distal end of the inner tube 14 extends to the maximum from the distal end of the catheter tube 12 (the balloon tube 16 has no slack or wrinkles and does not extend), the catheter 10 is moved. From its tip, it is inserted into the ureter, bile duct, digestive tract, or other body lumen. For example, for insertion into a body cavity such as a bile duct, a Seldinger method or the like may be employed. When the distal end of the catheter 10 (the inner tube 14) comes closer to the foreign matter 30 such as a calculus, the catheter hub 20 is operated, and the inner tube 14 is operated.
The suction plate 18 arranged at the tip of
Then, the inner tube 14 is sucked by the suction device 26, and the foreign matter 30 is adsorbed and captured by the suction plate 18.

From this state, the pressurizer 22 is operated to pressurize the closed space formed by the inside of the catheter hub 20 and the like, and the balloon tube 16 is inflated. Next, the inner tube 14 is pulled back to the proximal side by operating the inner tube hub 24 while the foreign matter 30 is captured (the catheter tube 12 is fixed at this time). By this operation, the fixed positions of both ends of the balloon tube 16 are contracted, and the distal end side of the expanded balloon tube 16 is
Retracts to the proximal side of the, resulting in a constricted shape. Further, when the catheter 10 is pulled back to the proximal end side in this state, the balloon tube 16 wraps and holds the captured foreign matter 30. If the foreign matter 30 is not sufficiently wrapped, the catheter tube 12 is advanced in the distal direction or retracted to the proximal side by operation of the catheter hub 20 (hereinafter simply referred to as advanced and retracted), The balloon tube 1 is retracted and advanced by operating the pipe hub 24, and the balloon tube 16 is contracted and expanded by operating the pressurizer 22.
6 improves the entrapment of foreign matter.

When the catheter 10 is pulled back in this state,
Friction between the inner wall of the living body lumen and the balloon tube 16 further envelops the foreign matter 30, and the balloon tube 16
Thus, the foreign matter 30 can be more reliably held, and the foreign matter 30 can be removed by pulling the catheter 10 out of the living body. Further, since the foreign matter 30 is wrapped in the balloon tube 16, the foreign matter 30 does not damage the inner wall of the living body lumen. Therefore, even when the foreign matter 30 to be captured is relatively large, it can be safely extracted outside the body without performing operations such as crushing.

The catheter 10 shown in FIGS.
As a preferred embodiment, an adsorbing plate 18 that adsorbs and traps the foreign matter 30 is disposed at the tip of the inner cylindrical tube 14. However, the present invention is not limited to this. The foreign matter 30 may be adsorbed and captured by the tip of the inner tube 14 by the suction of 26.

The catheter of the present invention is not limited to the one having such a capturing means. The balloon tube which can make the outer diameter of the maximum inflatable portion at the time of inflation three times or more that at the time of deflation, a slide member, Alternatively, the foreign matter may be held only by the catheter tube. Therefore, in this case, the slide member does not need to be cylindrical. In this embodiment, after the distal end of the slide member is positioned near the foreign matter 30 in the same manner as in the above-described example, the balloon tube is inflated by the pressurizer. Pull back, and further advance or pull back the catheter tube as needed,
By retracting or advancing the slide member and further contracting and expanding the balloon tube, the foreign matter 30 may be wrapped and held by the balloon tube, and the catheter may be pulled out. In this embodiment, preferred balloon tubes are the same as in the previous embodiment.

Since the catheter 10 shown in the drawing has the suction plate 18, the balloon tube 16
Is slightly proximal to the distal end of the inner tube 14, but in an embodiment without the suction plate 18, the balloon tube 16 should be fixed at the distal end of the inner tube 14. preferable.

FIG. 6 shows the configuration of another embodiment of the catheter of the present invention, and FIG. 7 shows a schematic sectional view of the distal end thereof. The catheter 40 shown in FIGS. 6 and 7 has a forceps 42 for grasping and capturing the foreign material 30 as a means for capturing the foreign material 30. Here, the catheter 40 in the illustrated example includes the suction plate 18,
Except for using the forceps 42 instead of the suction-based means consisting of the inner tube 14 and the suction device 26, the catheter 10 has basically the same configuration as the catheter 10, and therefore the same members are denoted by the same reference numerals. Will mainly be described for different parts.

The forceps 42 includes a claw portion 44 for gripping the foreign matter 30.
, A wire 46, and a forceps operating tool 48. The claw portion 44 is configured to have a plurality of claws 44a whose tips are bent.
6 is rotatably supported at the tip. Also, the nail 44
a is urged in the outward direction, that is, the opening direction, by a known means using a shape memory alloy, a spring, or the like. The wire 46 is, for example, a flexible metal wire that is inserted through the inner tube 14 and supports the claw portion 44 at the distal end as described above. The proximal end of the wire 46 penetrates through the tube tube hub 24 and is connected to the forceps operating tool 48. The forceps operating tool 48 moves (progresses and retracts) the wire 46 inserted through the inner tube 14 in the axial direction by operating the lever 50.

When the forceps 42 is open, the distal end of the wire 46 slightly protrudes from the inner cylindrical tube 14.
Each claw 44a of the claw portion 44 is actuated by the applied urging force.
It is turning outward. By operating the lever 50 and pulling back the wire 46, the claw portion 44 is housed in the inner tube 14, the claw 44 a is moved inward by the inner tube 14, the forceps are closed, and the foreign matter 30 is removed. Capture. vice versa,
By operating the lever 50 to advance the wire 46 from the captured state, the claw portion 44 is ejected from the inner tube 14, and the claw 44 a is released from the inner tube 14, and the claw 44 a
, The forceps 42 is opened.

The operation of removing the foreign matter from the catheter 40 is performed in the same manner as the above-described catheter 10 except that the foreign matter 30 is captured by the forceps 42. That is, the catheter 40 is inserted into the body cavity 1 and the forceps 42
When the claw portion 44 comes close to the foreign object 30, the catheter hub 20 is operated to position the catheter 40 at a position where the claw portion 44 can grasp the capture. Next, by operating the lever 50 of the forceps operating tool 48, the connecting member 42 is pulled back,
The claw 44 is closed, and the foreign object 30 is grasped and caught by the forceps 42. Further, the balloon tube 16 is inflated by the pressurizer 22, and further, in the same manner as in the above-described example,
The inner tube 14 and the catheter 40 are pulled back, or the catheter tube 12 is advanced or retracted as necessary, the inner tube 14 is retracted or advanced, and further, the balloon tube 16 is contracted or expanded, and the like.
The foreign matter 30 is wrapped and held by the balloon tube 16,
The foreign matter 30 is removed from the body by pulling out the catheter.

In the illustrated example, the forceps 42 (the claw portion 44) is closed using the inner tube 14;
Separately, a tube for opening and closing the forceps 42 may be provided, and in the configuration of the illustrated example, a reinforcing material for securing the rigidity of the portion to be closed by contact with the claw portion 44 is disposed in the inner tube 14. You may. Further, the forceps used for the catheter of the present invention is not limited to the above configuration, and various known forceps can be used.

FIGS. 8 and 9 are schematic cross-sectional views of a tip portion according to another embodiment of the present invention. In this example, the catheter 1 of the present invention described above is added to an endoscope catheter incorporating an endoscope.
This is an example in which 0 is set.

The first lumen 62 of the endoscope catheter 60
Accommodates an endoscope 68 having a condenser lens 64 and an optical fiber bundle 66. Further, the second lumen 70 of the endoscope catheter 60 includes the catheter 1 of the present invention.
0 is stored. Thus, by using the catheter of the present invention in combination with an endoscope, foreign matter 3
Since the operation can be performed while observing 0, the treatment can be performed safely and accurately.

In this embodiment, as shown in FIG. 8, the catheter 10 of the present invention is retracted into the second lumen 70 of the endoscope catheter 60, and the endoscope 68 is used for observation. Advance catheter 60 to the desired location. Next, the catheter 10 is advanced while the calculus is confirmed by the endoscope 68, and as shown in FIG.
8 is brought into contact with the stone. In the above operation, it is preferable to flush the endoscope 68 with physiological saline at any time in order to secure the visual field of the endoscope 68. From now on,
The operation is performed in the same manner as the removal of the foreign material 30 by the catheter 10 described above, and as shown in FIG. 9, the foreign material 30 is wrapped in the balloon tube 16 and the endoscope catheter 60 is pulled out to remove the foreign material 30 from the living body. Remove.

In this embodiment, liquid injection, suction, and other medical treatments can be performed via the inner tube 14 or the endoscope catheter 60. Further, instead of the endoscope 68, a diagnostic ultrasonic probe, a therapeutic probe such as laser, ablation, or the like may be used. Of course, they can be used together.

Although the foreign matter removing catheter of the present invention has been described in detail above, the present invention is not limited to this, and various improvements and changes can be made without departing from the gist of the present invention. Of course it is good. For example, by incorporating means for arbitrarily bending the distal end portion into the catheter for removing foreign matter of the present invention, direction selectivity can be added and treatment can be suitably performed even in a complicated region, which is more preferable.

[0051]

As described above, according to the catheter for removing foreign matter of the present invention, even if a relatively large stone is trapped, it can be removed from the body in a minimally invasive manner without damaging the body lumen. can do. In addition, the treatment procedure can be unified, and the burden on the operator and the patient can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of a foreign matter removing catheter of the present invention.

FIG. 2 is a schematic cross-sectional view of a distal end portion of the foreign matter removing catheter shown in FIG.

FIG. 3 is a schematic sectional view of a distal end portion of the foreign matter removing catheter shown in FIG.

FIG. 4 is a schematic sectional view of a catheter hub of the catheter for removing foreign matter shown in FIG. 1;

FIG. 5 is a schematic sectional view of a distal end portion of the foreign matter removing catheter shown in FIG. 1;

FIG. 6 is a schematic view of another example of the foreign matter removing catheter of the present invention.

FIG. 7 is a schematic sectional view of a distal end portion of the foreign matter removing catheter shown in FIG. 6;

FIG. 8 is a schematic sectional view of a distal end portion of another example of the foreign matter removing catheter of the present invention.

9 is a schematic cross-sectional view of the distal end portion of the foreign matter removing catheter shown in FIG.

[Explanation of symbols]

 10, 40 (for removing foreign matter) catheter 12 catheter tube 14 inner tube 16 balloon tube 18 suction plate 20 catheter hub 22 pressurizer 24 inner tube hub 26 suction device 28 lumen 30 capture 32 sealing packing 42 forceps 44 nail 44a claw 46 connecting member 48 forceps operating tool 50 lever 60 endoscope catheter 62 first lumen 64 condenser lens 66 optical fiber bundle 68 endoscope 70 second lumen

Claims (3)

[Claims] 1. A catheter tube having at least one lumen, a slide member inserted movably in an axial direction into a lumen of the catheter tube,
A cylindrical member made of an elastic body, one end of which is fixed to the distal end of the catheter tube and the other end of which is fixed to the distal end of the slide member so that the inside of the cylinder can be air-tight or liquid-tight. A balloon capable of increasing the outer diameter of the balloon to at least three times the outer diameter at the time of deflation, and a connecting portion for connecting a pressurizer that expands and contracts the balloon by adjusting the pressure in the cylinder of the balloon. A foreign matter removal catheter, wherein foreign matter in the body is wrapped and removed by the balloon. 2. A catheter tube having at least one lumen, and a slide member inserted into the lumen of the catheter tube so as to be movable in an axial direction.
A balloon made of an elastic body, one end of which is fixed to the distal end of the catheter tube, and the other end of which is fixed to the distal end of the slide member so that the inside of the cylinder can be air-tight or liquid-tight; A connection portion for connecting a pressurizer for inflating and deflating the balloon by adjusting the pressure in the cylinder, and a capturing means disposed at the tip of the slide member for capturing a foreign material; Wherein the balloon is wrapped and removed by the balloon. 3. The catheter for removing foreign matter according to claim 2, wherein said capturing means is means for sucking and capturing foreign matter or means for grasping and capturing foreign matter.