JPH0984878A - Catheter tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve or relax anisotropy in the curved direction and to improve operability of inserting operation. SOLUTION: This catheter tube has a tube main body 2 and four lumens are formed thereon. In the parts except bent parts (apex parts) of a pair of lumens among them, an anti-shrinking member 6 consisting of a flat sheet coil is stored and wires 41 and 42 are inserted into their insides, respectively. An operational tool main body 91 is arranged on the base end part 23 of the tube main body 2 and a fixing means 7 for fixing the movement of the anti- shrinking member 6 to the tube main body 2 and releasing the fixing is installed on the operational tool main body 91. The fixing means 7 is constituted of a supporting member 71, an elastic member 72, a rigid tube 73, a press member 74, a handle 75 and a sliding member 76.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is used by inserting it into a body cavity such as a blood vessel, heart, digestive tract, urethra, bile duct, abdominal cavity, uterus, or brain, and observing the insertion site, diagnosis, medical treatment. The present invention relates to a catheter tube for performing treatment and the like.

[0002]

2. Description of the Related Art In a catheter tube which is used by inserting it into a body cavity, the distal end of the catheter tube can be remotely controlled in order to direct the distal end of the catheter tube toward a target site or to position it at the target site. A catheter tube having a bending mechanism (pivoting mechanism) for bending a portion has been developed. In particular, in the catheter tube that constitutes the endoscope, the bending mechanism of the distal end portion is one of the important mechanisms for selecting the field of view of the observation site.

In recent years, as the diameter of an endoscope has been reduced, a bending mechanism having a structure not using node rings has been developed.

As one example thereof, a plurality of lumens are formed along the longitudinal direction of a tube main body composed of a non-bent portion (intermediate portion) to which a certain degree of rigidity is given and a bent portion located on the tip side thereof. There is a multi-lumen catheter.

As shown in FIG. 9, in this multi-lumen catheter 10, in addition to a lumen 11 for accommodating an optical fiber bundle 8 and a lumen 12 for injecting a liquid, two wires which are opposed to each other via a central axis of the catheter are inserted. The lumens 13 and 14 are formed, and the wire 1 for pulling and bending the bending portion 18 in both the lumens 13 and 14
5 and 16 are inserted respectively. Then, by pulling the wires 15 and 16 on the proximal side of the catheter, the bending portion 18 bends in the direction of the pulled wire.

Further, in the non-curved portion (intermediate portion) 17 of the multi-lumen catheter 10, the wires 15, 16 are relatively rigid in the lumens 13, 14 for wire insertion so that the wires 15, 16 will not be curved accordingly. The member (not shown) is stored.

By the way, such a multi-lumen catheter 10 bends following the bending of the tubular organ 19 when inserted into the tubular organ 7 such as a blood vessel or a bile duct, but the lumens 13 and 14 for wire insertion are used. Since the high-rigidity member is housed therein and both ends thereof are fixed to the multi-lumen catheter 10, it is difficult to bend in the direction in which the wire insertion lumens 13 and 14 are present, and therefore, in FIG. As indicated by the arrow, the lens bends in the direction in which the lumen 11 that houses the optical fiber bundle 8 or the liquid injection lumen 12 exists.

As described above, the conventional multi-lumen catheter 10 has a direction in which it easily bends and a direction in which it does not bend easily.
There is a problem that it is difficult to insert into a bile duct or the like, in particular, to smoothly, swiftly, and reliably insert a tubular organ having a small diameter portion, a branch portion, a stenosis portion, or the like.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a catheter tube capable of eliminating or relaxing the anisotropy in the bending direction and facilitating insertion operation.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (10).

(1) A catheter tube having at its tip a bent portion which is bent by a pulling operation of a wire, the tube body having flexibility in which at least one lumen is formed, and the tip is provided at the bent portion. Fixed,
At least one wire that bends the bent portion by a pulling operation on the base end side of the tube body, an anti-shrink member that is inserted into the lumen in a portion other than the bent portion, and a base end of the tube body. A catheter tube which is provided on a side of the catheter body, and which has fixing means for fixing movement of the anti-shrinkage member with respect to the tube body and releasing the fixation.

(2) The catheter tube according to (1), wherein the anti-shrink member has a hollow portion, and the wire is inserted into the hollow portion.

(3) The catheter tube according to the above (2), wherein the anti-shrinkage member is composed of a flat coil formed by spirally winding a flat wire.

(4) Any one of the above (1) to (3), which has at least one lumen for accommodating an observation instrument or a medical treatment / diagnosis tool between the lumens accommodating the anti-shrink member of the tube body. The catheter tube according to.

(5) The fixing means has a first member made of an elastic material and a second member for pressing and deforming the first member. First
The catheter tube according to any one of (1) to (4) above, wherein when the member of (1) is deformed, a part of the member is brought into close contact with the proximal end of the anti-shrink member to fix the movement thereof. .

(6) The first member has a hole through which the anti-shrinkage member passes, and the hole is deformed by the pressing of the second member so that the inner surface of the hole closely adheres to the anti-shrinkage member. The catheter tube according to (5), which is configured to:

(7) The catheter tube according to the above (5) or (6), wherein a third member which does not substantially deform even when the first member is deformed penetrates the first member. .

(8) The catheter tube according to any one of the above (5) to (7), which has a friction reducing means for reducing friction between the first member and the second member.

(9) A reinforcing material made of a linear body is embedded near the outer peripheral surface of the tube body.
The catheter tube according to any one of (1) to (8).

(10) The catheter tube according to the above (9), wherein the distal end of the reinforcing material is located in the middle of or at the proximal end of the bent portion.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The catheter tube of the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is an overall side view showing an embodiment in which the catheter tube of the present invention is applied to a catheter tube which constitutes an endoscope (fiberscope), and FIG.
Is a perspective view showing the configuration of the distal end portion of the catheter tube shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III in FIG.
4 is a sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a sectional view taken along line VV in FIG. 4, and FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a longitudinal sectional view showing a structural example of the fixing means in the present invention. In the following description, the right side in FIGS. 1 to 4 and 7 is referred to as “base end”, and the left side is referred to as “tip”.

As shown in FIGS. 1 to 6, the catheter tube 1 of the present invention has a tube body 2. The tube body 2 is made of a flexible polymer material such as soft polyvinyl chloride, polyethylene, polypropylene, polyurethane, polyamide, polytetrafluoroethylene, silicone rubber, and ethylene-vinyl acetate copolymer. Has been done.

In order to make the catheter tube 1 visible under fluoroscopy, it is preferable that the tube body 2 be provided with an X-ray contrast property. Examples thereof include a method of incorporating an X-ray opaque substance such as barium sulfate, bismuth oxide, and tungsten into the constituent materials, and a method of embedding or adhering a marker made of such an X-ray opaque substance to the surface.

Further, in order to improve the slidability with respect to the body cavity to be inserted, for example, a hydrophilic polymer (eg maleic anhydride copolymer) or a fluororesin (eg polytetrafluoroethylene) is provided on the outer surface of the tube body 2. Low friction materials such as) may be coated.

A bent portion 21 which is bent or bent by a wire pulling operation described later is formed on the distal end side of the tube body 2, and a bent portion 2 is formed at a base end portion 23 of the tube.
An operation tool 9 for performing a bending operation of 1, a fixing / unlocking operation of a fixing means 7 described later, and the like is installed. An intermediate portion 22 is formed between the bent portion 21 and the base end portion 23 of the tube body 2. The intermediate portion 22 has flexibility such that when the catheter tube 1 is inserted into a tubular organ such as a blood vessel or a bile duct, the intermediate portion 22 bends following the bending or bending of the tubular organ. It is configured not to be bent by a wire pulling operation described later.

Inside the tube body 2, four lumens 31, 32, 33 and 34 are formed over almost the entire length in the longitudinal direction.

The lumens 31 and 32 are formed so as to be separated from each other in the opposite direction from the central axis of the tube body 2 in the cross section, and the tips of the lumens 31 and 32 are respectively formed on the tip surface of the tube body 2. It is open to the public.

The lumen 31 has a catheter tube 1
An optical fiber bundle 8 is housed as an observing tool for observing the inside of the tubular organ into which is inserted. This optical fiber bundle 8
Can also be used for medical treatment such as irradiating the inner wall of a tubular organ with laser light.

The optical fiber bundle 8 is, as shown in FIG.
It is composed of a light-transmitting fiber (light guide) 81 and a light-receiving fiber (image fiber) 82, and these optical fibers are made into a bundle by being hardened with a resin such as epoxy, acrylic, or silicone rubber.

The light transmitting fiber 81 and the light receiving fiber 82 are composed of optical fibers made of quartz, multi-component glass, plastics or the like.

A lens 83 for collecting the reflected light from the observation site is attached to the tip of the optical fiber bundle 8, and this portion is located near the opening at the tip of the lumen 31. In addition, the optical fiber bundle 8 is
Lumen 31 is preferable, but fixedly installed
In contrast, the optical fiber bundle 8 can be slidable, and the tip end portion of the optical fiber bundle 8 can be retracted from the tip end opening of the lumen 31.

Light emitted from a light source (not shown) on the proximal end side (right side in FIG. 1) of the operating tool 9 is transmitted through the light-sending fiber 81 and is radiated from the tip to the observation portion, and the reflected light is reflected. The light is collected by the lens 83 and taken in from the tip of the light receiving fiber 82, and the image is transmitted through the fiber 82 and guided to the image receiving portion (not shown) on the base end side of the operation tool 9.

The lumen 32 is open to the tip of the tube body 2, and a fluid can be injected into the tubular organ or suctioned from the tubular organ through the opening of the tip. Specifically, the lumen 32 is used to administer a drug solution or the like into the tubular organ into which the catheter tube 1 has been inserted and left, or to obstruct the field of vision when observing the inside of the tubular organ with an endoscope. It is also used as a flush channel for ejecting a transparent liquid (for example, physiological saline or glucose solution) for pushing out body fluid such as blood and bile.

In addition to the above, the lumens 31 and 32 are
It can also be used as a channel for inserting a guide wire, a medical treatment / diagnostic tool, or the like. As medical treatment / diagnostic tools, for example, forceps, cytology brush, injection needle, high frequency,
Probes that emit ultrasonic waves, electrohydraulic shock waves, and the like (for calculus breaking), various sensors, and their conductors.

Note that the inner surface of at least one of the lumens 31 and 32 may be made of the low friction material described above (for example, a coating layer of the low friction material may be formed). In this case, the sliding resistance of the optical fiber bundle inserted into the lumen, the medical treatment, the diagnostic tool, etc. is reduced, and the insertion operation, movement, rotation, etc. of these can be performed more smoothly.

The lumens 33 and 34 accommodate the wires 41 and 42 for bending the bending portion 21 and the anti-shrinkage member 6 for preventing the bending of the intermediate portion 22 and the base end portion 23 during the bending operation of the bending portion 21. It is a lumen for doing.

These lumens 33 and 34 are separated from the central axis of the tube main body 2 in the opposite directions in the cross section, and in a direction orthogonal to the lumens 31 and 32, that is, in phase with respect to the lumens 31 and 32. Are formed at positions shifted by approximately 90 °. The tips of both lumens 33 and 34 are closed.

In the lumens 33 and 34 of the intermediate portion 22 and the base end portion 23, the anti-shrinkage member 6 made of a flat plate coil in which a flat plate wire is spirally wound with almost no space is housed. The anti-shrinkage member 6 has flexibility and can bend, but has anti-shrinkage properties that do not substantially shrink in the longitudinal direction.
The contraction and bending of the tube body 2 due to the pulling of 42 are prevented.

The tips of the two anti-shrinkage members 6 are inserted up to the vicinity of the boundary 24 between the bent portion 21 and the intermediate portion 22 of the tube body 2 and fixed at this boundary 24. That is, when the outer peripheral surface of the boundary portion 24 is heated and pressed (tightened) while being coated with, for example, a heat-shrinkable tube (not shown), the tube body material is melted or softened, and the lumens of the lumens 33 and 34 are narrowed. Become, lumen 33, 3
4 is deformed so that the inner wall surface on the outer peripheral side of the tube main body protrudes inward, and is pressed and brought into close contact with the outer peripheral surface of each anti-shrink member 6, and due to their frictional force, the distal end portion of each anti-shrink member 6 becomes lumen 33. , 34 are fixed.

The fixing of the tip of the anti-shrinkage member 6 is not limited to the above-mentioned method. For example, at the boundary 24, the inner surface of the lumens 33 and 34 and the outer circumferential surface of each anti-shrinkage member 6 are adhesive (filled). It is also possible to adopt a method of adhering with a material or the like, a method of tightening and fixing each anti-shrinkage member 6 by caulking with a caulking member. On the other hand, the base ends of the two anti-shrinkage members 6 are fixed by the fixing means described later.

The inner diameter of the lumens 33, 34 is preferably about 1.0 to 2.0 times the outer diameter of the anti-shrinkage member 6,
It is more preferable to set it to about 1.01 to 1.4 times. If the inner diameter of the lumens 33, 34 is less than 1.0 times the outer diameter of the anti-shrinkage member 6, the anti-shrinkage member 6 cannot be inserted, and if it exceeds 2.0 times, the tube body 2 is sufficiently thin. In addition, when the wires 41, 42 are pulled toward the proximal end side (hand side), the anti-shrinkage member 6 may meander in the lumens 33, 34, and the intermediate portion 22 may be curved. is there.

An insertion hole 61 is formed in the central portion of each anti-shrink member 6 housed in the lumens 33 and 34, and the bent portion 21 is pulled into the insertion holes 61 to be bent. Wires 41 and 42 are inserted therethrough.
The wires 41, 42 are exposed from the tip end openings of the respective insertion holes 61, and the lumens 33, 34 in the bent portion 21.
It is inserted inside. The tips (heads) 43 and 44 of the wires 41 and 42 are the lumens 33 and 44, respectively.
It is embedded and fixed in the closed portion of 34. In this case, the tips 43 and 44 of the wires 41 and 42 are arranged so as not to be exposed at the tip surface of the tube body 2.

The tips 43 and 44 of the wires 41 and 42 are
Positions eccentric from the central axis of the tube body 2,
It is preferably fixed near the outer periphery of the tube body 2, and therefore, when one of the wires 41, 42 is pulled toward the proximal end side, the bent portion 21 is pulled by the pulling part 21 as shown by the one-dot chain line in FIG. Bend the wire to the side with the tip.

As the wires 41 and 42, those having strength and durability to the extent that disconnection does not occur due to frequent pulling operations and having little elongation are preferable, for example, stainless steel and superelastic alloys. And the like, high-tensile resin fibers such as polyamide, polyethylene, polyarylate, polyester, and polyimide, and single wires and fiber bundles made of carbon fibers.

The outer diameters of the wires 41 and 42 differ depending on various conditions such as the constituent materials thereof, the cross-sectional shape of the tube body 2, the dimensions, the constituent materials, etc., but the wires 41, 42 are made of, for example, polyarylate twisted yarn or stainless steel. When it is made of steel single wire, its outer diameter is about 30-500 μm,
In particular, the thickness is preferably about 50 to 300 μm.

As the constituent material of the anti-shrinkage member 6, for example, various metal materials such as stainless steel, carbon steel, tungsten steel, copper-based alloys such as copper or brass, aluminum, platinum, superelastic alloys, etc. Fluoroethylene,
Examples include various resins such as polyethylene, polypropylene, polyvinyl chloride, and polyester.

The dimensions such as the thickness of the anti-shrinkage member 6 differ depending on various conditions such as the constituent material thereof, the cross-sectional shape of the tube body 2, the dimensions, and the constituent material. For example, the wire used for the flat coil has a rectangular cross section. In case of stainless steel, its thickness is about 10 μm to 1 mm, especially 10 to 300 μm
It is preferable to set the degree.

The flat coil forming the anti-shrinkage member 6 is preferably a tightly wound coil having as few gaps as possible. That is, the total gap between the flat plate coils is preferably 10% or less of the total length of the anti-shrinkage member 6, and more preferably 3% or less. As a result, the anti-shrinkage member 6 is less likely to bend in the intermediate portion 22, and the shrinkage of the tube body 2 can be prevented more reliably.

The flat coil of the anti-shrinkage member 6 is not limited to a single-layer winding, but may be a plurality of layers or a plurality of windings.

Further, the anti-shrinkage member 6 is not limited to the flat plate coil shown in the figure, but it can follow the bending and bending of the tubular organ of the intermediate portion 22, such as a super elastic alloy pipe and a metal pipe with a spiral slit. It may be flexible to the extent that it does not hinder flexibility and has anti-shrinkage properties in the longitudinal direction.

At the outer peripheral portion (near the outer peripheral surface) of the tube main body 2, a tubular reinforcing member 5 is embedded in at least the base end portion 23 and the intermediate portion 22 of the tube main body 2 so as to surround the lumens 31 to 34. There is. In this embodiment, the reinforcing material 5 is
It is installed in the base end portion 23 and the intermediate portion 22 and is extended to the middle of the bent portion 21 (see FIGS. 3 and 4), so that the bending rigidity of the bent portion 21 decreases toward the distal end. Is set to.

Examples of the reinforcing material 5 are metal materials such as stainless steel and superelastic alloys, polyamide, polyethylene, polypropylene, polyester, polyimide,
A resin material such as ABS resin or the like, a linear body made of carbon fiber or the like, particularly a braided body formed by intersecting the linear bodies to form a net is preferable.

By installing the reinforcing member 5 as described above, the torsional rigidity of the catheter tube 1 is enhanced, and when the proximal end portion 23 side is rotated, the torque is transmitted to the distal end portion 21 side. improves. Further, when the tube body 2 is bent, particularly when it is bent at a steep angle, the lumens 31 to 34 are prevented from being closed or narrowed accordingly. Further, by setting the tip position of the reinforcing member 5, the rigidity of the bent portion 21 can be adjusted to another stage, and the bending and bending of the bent portion 21 by the wire operation can be performed more easily and in an appropriate shape.

The position of the tip of the reinforcing member 5 is not limited to the middle of the bent portion 21 as shown in the drawing, but may be, for example, the boundary portion 24.
It may be at the base end of the bent portion 21 or in the middle of the intermediate portion 22.

As shown in FIG. 1, the catheter tube 1
The operating tool 9 connected to the proximal end side of the operating tool body 91 has an operating tool body 91, and the proximal end portion 23 of the tube body 2 is inserted from a manifold portion 92 formed at the tip of the operating tool body 91. . In addition, the grip portion 93 is provided on the proximal end side of the operation tool body 91.
A connector 94 for inserting the optical fiber bundle 8 of the endoscope into the lumen 31 via the tube 98 is attached to the proximal end portion of the grip portion 93. Further, the grip portion 93 is formed with a branched portion 95 which is branched in an oblique direction, and a connector 96 for injecting a liquid into the lumen 32 through a tube 99 is attached to an end portion of the branched portion 95, for example. ing.

An operation dial 97 for pulling the wires 41, 42 is rotatably supported between the manifold portion 92 of the operation tool body 91 and the grip portion 93. A take-up reel (not shown) is fixed to the rotary shaft of the operation dial 97 and rotates integrally with the operation dial 97. The proximal ends of the wires 41, 42 are exposed from the proximal end of the anti-shrinkage member 6, pass through the inside of the operation tool body 91, and are wound around the winding reel in mutually opposite directions. Accordingly, when the operation dial 97 is rotated clockwise in FIG. 1, the wire 42 is pulled, the wire 41 is relaxed, and the bending portion 21 is bent upward in FIG. 4, so that the operation dial 97 is moved in the opposite direction. When rotated, wire 4
1 is pulled, the wire 42 relaxes, and the bending portion 21 bends downward in FIG.

The manifold portion 92 of the operation tool body 91 is provided with fixing means 7 for fixing the movement of the anti-shrink member 6 with respect to the tube body 2 and for releasing the fixation. The structure of the fixing means 7 and its surroundings will be described below with reference to FIGS. 7 and 8.

As shown in FIG. 7, a cylindrical support member 71 for supporting the base end portion 23 of the tube body 2 and the like is fitted and fixed to the manifold portion 92. Support member 71
In the hole 711 formed on the tip side of the tube body 2
The base end side 23 thereof is fitted and adhered with an adhesive as required.

Further, on the base end side of the support member 71, there is provided an enlarged diameter portion 712 forming a space communicating with the hole 711, and in the enlarged diameter portion 712, an elastic member 72 described later is provided.
Is inserted. In this case, the tip end surface of the elastic member 72 is in contact with the tip end surface of the expanded diameter portion 712. A male screw 713 is formed on the outer peripheral surface of the base end portion of the support member 71.

From the base end of the tube body 2, the lumen 3
The anti-shrinkage member 6 inserted in 3, 34 projects toward the base end side. Further, one ends of connection tubes 98 and 99, which are preferably flexible, are fitted and connected in the lumens 31 and 32 at the proximal ends of the tube body 2, respectively.

The elastic member (first member) 72 is, for example,
It is a substantially columnar member made of various rubbers such as silicone rubber, natural rubber, isoprene rubber, styrene-butadiene rubber, nitrile rubber and urethane rubber, and elastic materials such as thermoplastic elastomer. An elliptical hole 721 into which a rigid tube 73 to be described later is fitted is formed in the central portion of the elastic member 72, and a pair of circular holes 722 and 723 facing each other through the hole 721 are formed.

A rigid tube (third member) 73 having a substantially elliptical cross section is fitted into the hole 721, and the rigid tube 73 is further provided.
The connection tubes 98 and 99 are inserted side by side in the inside of. Further, the anti-shrinkage members 6 projecting from the base end of the tube body 2 are inserted into the holes 722 and 723, respectively. The holes 722 and 723 are deformed so as to be flattened or elliptical, for example, as the elastic member 72 is compressed and deformed in the axial direction.

The inner diameter of the holes 722, 723 when the elastic member 72 is not compressed and deformed is preferably set to a value substantially equal to or slightly larger than the outer diameter of the anti-shrinkage member 6. Further, in the illustrated configuration, the inner diameters of the holes 722 and 723 are constant in the longitudinal direction, but the invention is not limited to this,
For example, the holes 722 and 723 may have one or two or more portions (constricted portions) in which the inner diameters are smaller than the other portions. As a result, the elastic member 72 is compressed and the hole 72
When 2,723 deform | transforms, the effect | action which fixes the inserted anti-shrink member 6 can be acquired more effectively.

The rigid tube 73 has such a rigidity that it does not substantially deform even when the elastic member 72 is pressed and deformed. For example, rigid polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, It is composed of various hard resins such as polyester such as polybutylene terephthalate, various metal materials such as stainless steel, aluminum, copper or copper alloys, and various ceramics.

When the connecting tubes 98, 99 have a certain degree of rigidity and there is no danger of being crushed by the deformation of the elastic member 72, or the connecting tubes 98, 99 are arranged at positions that are not affected by the deformation of the elastic member 72. In this case, it is not necessary to provide the rigid tube 73 on the elastic member 72.

An elastic member 72 is provided at the base end of the support member 71.
A pressing member (second member) 74 for axially pressing and deforming is attached. The pressing member 74 includes a cylindrical inner cylinder 741 and an outer cylinder 742 formed on the outer peripheral portion of the inner cylinder 741. The inner cylinder 741 is inserted into the expanded diameter portion 712 of the support member 71.

Inside the inner cylinder 741, a pair of anti-shrink members 6 projecting from the base end of the elastic member 72, wires 41 and 42 further projecting from them, and a tube 98 projecting from the base end of the rigid tube 73. , 99 are inserted. In addition, a ring-shaped slide made of a low-friction material is provided between the distal end surface of the inner cylinder 741 and the proximal end surface of the elastic member 72 as friction reducing means for reducing these frictions due to the rotation of the pressing member 74. A member 76 is installed.

As the constituent material of the sliding member 76, for example, polytetrafluoroethylene, polycarbonate,
Examples thereof include resin materials such as polyethylene terephthalate and polyimide, and metal materials such as aluminum and stainless steel.

It should be noted that such friction reducing means is not limited to the installation of the sliding member 76, but may be installation of, for example, a bearing, a roller, or a rotating body that rotates with respect to the pressing member 74 or the elastic member 73. Good.

On the other hand, the outer cylinder 742 has a shorter length than the inner cylinder 741, and a female screw 743 which is screwed with the male screw 713 of the support member 71 is formed on the inner peripheral surface thereof.

A handle 75 for rotating the pressing member 74 is fixedly or integrally formed at the base end of the pressing member 74. A hole 751 is formed in the center of the handle 75.
Are formed in the holes 751 and the wires 41, 4
2 and the connecting tubes 98 and 99 are inserted therethrough.

As shown in FIG. 1, a part of the handle 75 is exposed to the outside of the operation tool main body 91 through a rectangular opening 911 formed on each of opposite side surfaces of the operation tool main body 91. At the portion, the handle 75 is rotated with a finger or the like.

A ridge 752 is formed on the outer peripheral surface of the handle 75 to prevent slippage when the handle 75 is rotated.

The supporting member 71 and the elastic member 7 as described above.
2, the rigid tube 73, the pressing member 74, the handle 75, and the sliding member 76 constitute the fixing means 7.

The hole 75 of the handle 75 passes through the inside of the inner cylinder 741.
The wires 41 and 42 that have passed through 1 are further extended to the base end side in the operation tool body 91, and the base ends thereof are wound around the above-described take-up reel in mutually opposite directions. Further, the hole 751 of the handle 75 is passed through the inner cylinder 741.
The connection tubes 98 and 99 that have passed through are further extended to the base end side in the operation tool body 91, and those base ends are connected to the connectors 94 and 96, respectively. Also,
Optical fiber bundle 8 in lumen 31 of tube body 2
Is exposed from the base end of the connector 94 through the inside of the tube 98 and the inside of the connector 94.

Next, an example of the operation by the operation tool 9 and the operation thereof will be described. When the handle 75 is rotated in the predetermined direction and the pressing member 74 is moved to the most proximal side, no compressive force is applied to the elastic member 72,
The holes 722 and 723 maintain a circular cross section. As a result, the fixing of the anti-shrinkage member 6 is released (hereinafter, referred to as an unlocked state), and the base end portion of the anti-shrinkage member 6 is
The tube body 2 can be moved in the axial direction.

In this state, the tube main body 2 is inserted from its distal end side into a tubular organ such as a blood vessel or a bile duct. When the tube body 2 is inserted into the curved portion of the tubular organ,
Although it bends following the bending, in the unlocked state, the anisotropy of the bending direction in the intermediate portion 22 is eliminated or alleviated, and bending is possible in any direction. That is, since the anti-shrinkage member 6 does not exist in the direction in which the lumen 31 or 32 exists (vertical direction in FIG. 6), it can be easily bent,
On the other hand, the anti-shrinkage member 6 exists in the direction in which the lumen 33 or 34 exists (the left-right direction in FIG. 6), but since the base end portion of the anti-shrinkage member 6 is in the unfixed state, bending the tube body 2 in this direction , The base end of the anti-shrinkage member 6 is the tube body 2
With respect to the anti-shrinkage member 6, the tension and the compression force (the force that hinders bending) are prevented from acting on the anti-shrinkage member 6 respectively.

When the bent portion 21 of the tube body 2 reaches the target portion in the tubular organ, the handle 75 is rotated in the opposite direction to advance the pressing member 74 in the distal direction with respect to the support member 71. As a result, the tip of the pressing member 74 axially presses the elastic member 72 via the sliding member 76 and compresses it. The handle 75 and the pressing member 74
Since the tip end surface of the pressing member 74 and the sliding member 76 slide with low friction in accordance with the rotation, the handle 75 can be easily rotated with a relatively low torque, and damage to the elastic member 72 and the like is prevented. it can.

When the elastic member 72 is compressed in the axial direction in this manner, the holes 722 and 72 having circular cross sections are accordingly accompanied.
3 deforms into a flat or elliptical shape, and the inner surfaces of the holes 722 and 723 come into close contact with the outer peripheral surface of the anti-shrinkage member 6 inserted therethrough. As a result, the movement and rotation of the anti-shrink member 6 in the axial direction with respect to the tube body 2 are fixed (hereinafter, referred to as a fixed state).

Even if the elastic member 72 is compressed and deformed, the rigid tube 73 is not deformed due to its rigidity. Therefore, the connection tubes 98 and 99 inserted into the rigid tube 73 are inserted.
Will never collapse.

In such a fixed state, the bending portion 2 is rotated by rotating the operation dial 97 in a predetermined direction.
Bend 1 in the desired direction. That is, when the operation dial 97 is rotated clockwise in FIG.
2 is pulled, the wire 41 is relaxed and the bent portion 21 is bent upward in FIG. 4, and when the operation dial 97 is rotated in the opposite direction to the above, the wire 41 is pulled and the wire 42 is relaxed and bent portion 21. Bends downward in FIG.

In this case, the anti-shrinkage member 6 is fixed at the boundary portion 24 and the fixing means 7 so that the anti-shrinkage member 6 is prevented from moving relative to the tube body 2, and the anti-shrinkage member 6 moves in the radial direction (meandering) through the lumen 33. , 34 are restricted by the inner surfaces of the intermediate portions 22, and the bending of the intermediate portion 22 due to the pulling of the wires 41, 42 hardly occurs, and only the bent portion 21 where the anti-shrinkage member 6 does not exist bends reliably.

Thus, the inside of the tubular organ can be observed in a wide range through the optical fiber bundle 8 while bending the bending portion 21 in a desired direction. In addition, liquid injection, suction, and other medical treatments can be performed via the lumen 32, and in particular, they can be performed in a wide range.

When the tube main body 2 is moved forward or backward to move the bent portion 21 to another portion, the handle 75 is rotated again to bring the base end portion of the anti-shrinkage member 6 into the unlocked state. . Thereby, the anisotropy of the bending direction in the intermediate portion 22 is eliminated or alleviated, and the tube body 2
Bends easily following the curvature of tubular organs.

The catheter tube of the present invention has been described above based on the illustrated embodiment, but the present invention is not limited to this. For example, the fixing means may be the anti-shrinkage member 6
If it is possible to fix and release the movement of the tube body 2 with respect to the tube body 2, the elastic member 72 and its pressing member 7 as shown in the figure are used.
However, the structure may be any structure such as a structure including a clip mechanism or a chuck mechanism that can clamp and release the base end portion of the anti-shrinkage member 6.

In the catheter tube of the present invention, the number and arrangement of the lumens are not limited to those shown in the drawings. For example, at least one of the lumens 31 and 32 does not exist, or in addition to the lumens 31 to 34, other 1 or 2 or more lumens may be added.

Further, the catheter tube of the present invention may be a balloon catheter in which a balloon (not shown) which is expanded / contracted by injecting / exhausting a working fluid is provided at the tip of the tube body 2. In this case, a lumen for supplying the working fluid into the balloon can be added.

The use of the catheter tube of the present invention is not limited to the above-mentioned endoscope catheter tube,
For example, the present invention can be applied to various catheter tubes such as ablation catheters and cardiac output measurement catheters, trocar tubes used for laparoscopic surgery, and other various tubular bodies.

[0090]

As described above, according to the catheter tube of the present invention, by providing the fixing means for fixing / releasing the movement of the anti-shrinkage member with respect to the tube body,
In the fixed state, the bending portion can be bent easily and surely by pulling the wire.In the fixed state, the anisotropy of the bending direction of the tube body is eliminated or relieved, and the tubular body such as a blood vessel or bile duct is tubular. It is possible to easily, smoothly and properly perform the insertion operation into the organ.

When an anti-shrink member made of a flat plate coil is provided as the anti-shrink member, the diameter of the catheter tube is reduced, and the tube body is effectively prevented from shrinking or curving when the wire is pulled. be able to.

Further, the first fixing means is made of an elastic material.
Member and a second member that presses and deforms the first member, and by the deformation of the first member, a part thereof, particularly the inner surface of the hole through which the anti-shrink member is inserted, is the anti-shrink member. If it is configured so that it closely adheres to the base end of and secures its movement, the structure is simple and can be downsized, and the movement of the anti-shrinkage member can be securely fixed by simple operation It can be canceled.

Further, when the third member which is not substantially deformed even when the first member is deformed is provided, a soft tube or the like can be arranged so as to pass through the first member.

Further, when the friction reducing means for reducing the friction between the first member and the second member is provided, the movement of the anti-shrink member can be fixed / released with a smaller force. You can

Further, when a reinforcing material made of a linear body is embedded near the outer peripheral surface of the tube body, the torque transmissibility of the catheter tube is improved.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment in which the catheter tube of the present invention is applied to a catheter tube that constitutes an endoscope.

FIG. 2 is a perspective view showing a configuration of a distal end portion of the catheter tube shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a cross-sectional view showing the structure of a fixing means in the catheter tube shown in FIG.

FIG. 8 is a perspective view showing a structure of an elastic member and a rigid tube in the fixing means.

FIG. 9 is a cross-sectional view showing the structure of a conventional catheter tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Catheter tube 2 Tube main body 21 Curved part 22 Intermediate part 23 Base end part 24 Boundary part 31-34 Lumen 41, 42 Wire 43, 44 Tip 5 Reinforcing member 6 Anti-shrink member 61 Insertion hole 7 Fixing means 71 Supporting member 711 Hole 712 Expanded portion 713 Male screw 72 Elastic member 721 to 723 Hole 73 Rigid tube 74 Pressing member 741 Inner cylinder 742 Outer cylinder 743 Female screw 75 Handle 751 Hole 752 Convex strip 76 Sliding member 8 Optical fiber bundle 81 Light transmitting fiber 82 Light receiving fiber 83 lens 9 operation tool 91 operation tool body 911 opening 92 manifold section 93 gripping section 94 connector 95 branch section 96 connector 97 operation dial 98, 99 connection tube 10 multi-lumen catheter 11-14 lumen 15 and 16 wire 17 non-curved section 18 Bent part 19 Tubular organ

Claims (10)

[Claims] 1. A catheter tube having at its tip a bent portion that is bent by pulling a wire, the tube body having flexibility, wherein at least one lumen is formed, and the tip is fixed to the bent portion. And at least one wire that bends the bent portion by a pulling operation on the proximal end side of the tube body, an anti-shrink member that is inserted into the lumen in a portion other than the bent portion, and Provided on the base end side and fixing movement of the anti-shrink member with respect to the tube body,
A catheter tube having a fixing means capable of releasing the fixation. 2. The catheter tube according to claim 1, wherein the anti-shrink member has a hollow portion, and the wire is inserted into the hollow portion. 3. The anti-shrinkage member is composed of a flat plate coil formed by spirally winding a flat wire rod.
The catheter tube according to. 4. The catheter according to claim 1, wherein at least one lumen for accommodating an observation instrument or a medical treatment / diagnosis tool is provided between the lumens accommodating the anti-shrinkage member of the tube body. tube. 5. The first fixing member is made of an elastic material.
Member and a second member for pressing and deforming the first member, and when the first member is deformed by the pressing of the second member, a part of the member is the anti-shrink member. The catheter tube according to any one of claims 1 to 4, wherein the catheter tube is configured to be in close contact with the proximal end portion and to fix the movement thereof. 6. The first member has a hole through which the anti-shrinkage member passes, and the hole is deformed by the pressing of the second member, and the inner surface of the hole comes into close contact with the anti-shrinkage member. The catheter tube according to claim 5, which is configured as follows. 7. The catheter tube according to claim 5, wherein a third member which does not substantially deform even when the first member is deformed penetrates through the first member. 8. The catheter tube according to claim 5, further comprising friction reducing means for reducing friction between the first member and the second member. 9. The catheter tube according to claim 1, wherein a reinforcing material made of a linear body is embedded near the outer peripheral surface of the tube body. 10. The catheter tube according to claim 9, wherein the distal end of the reinforcing material is located in the middle or the proximal end of the bent portion.