JPH0533736U - catheter - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a catheter that can easily and surely bend the distal end portion of a catheter tube with a simple structure, thereby enabling observation of the inner wall of a body cavity and medical treatment. With the goal. [Constitution] Catheter 100 used by being inserted into a body cavity
Is composed of a shaft-shaped body 1 and an operating portion 30 connected to the shaft-shaped body 1. The shaft-shaped body 1 has at least two lumens extending over the entire length in the axial direction and extends a predetermined distance from the tip. The first tube 4 has at least two lumens formed therein, and the first lumen 6 has an opening at the tip of the first tube 4. A pulling wire 8 whose one end is fixed near the tip of the first tube 4 is inserted into the second lumen 7, and the main body 3 has at least two continuous wires formed from the tip 2. The first tube 4 is formed with a lumen, and the second tube 5 is formed so as to surround the outer circumference of the first tube 4 and has a bending rigidity larger than the first tube 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a catheter which is used by being inserted into a body cavity, for example, for observing and diagnosing the inside of the body cavity, and for medical treatment from the outside of the body to the inner wall surface of the body cavity, particularly a catheter constituting an endoscope (fiberscope). ..

[0002]

[Prior Art]

 An endoscope is inserted from the outside of the body to observe and diagnose the inside of the body cavity, and further administers a medicinal solution to the inner wall of the body cavity, collects body fluid, breaks stones by ultrasonic waves or shock waves, and irradiates laser beams or polyps caused by high-frequency current. Since it is possible to perform a therapeutic treatment such as cauterization, attention has been paid in recent years, and its diameter has been reduced.

In this endoscope, an optical fiber bundle for illumination and an image is housed in a flexible tube, and the tube is inserted to a target site in a body cavity and observed from the tip of the illumination fiber. The observation is performed by irradiating the part with light and taking the image from the tip of the imaging fiber to the base end side.

When observing the inside of a body cavity using such an endoscope, it is necessary to change the direction by bending the tip of the catheter tube according to the shape of the body cavity.

As a method of bending the tip of the tube from the position outside the body, conventionally, there is a method of using a guide wire which is a tube and a separate body, a method of sequentially connecting a plurality of node rings rotatably and moving the node ring with an operation wire (special feature Kosho Sho 60-21734, Shoko 62-23442 and Shoko 62-23447) were conducted.

However, in the method (1), since the guide wire is originally for guiding the catheter tube to the target site, it is difficult to operate and there is a drawback in that the tip of the tube cannot be fixed as the operator desires.

The tube used in the other method has a drawback that it is difficult to insert into a thin tube or a portion having a large bend because the tube has a complicated structure, the outer diameter of the tube becomes large, and the flexibility of the tube is lost. Therefore, under the present circumstances, there is no suitable method for bending the distal end of the catheter tube in an endoscope which is used by inserting it into a tube having a small inner diameter such as a blood vessel, a bile duct, a pancreatic duct and a ureter.

[0008]

[Problems to be solved by the device]

 The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to perform observation and treatment of body cavities, particularly the inner wall of thin tubes such as blood vessels, bile ducts, and ureters, and treatment of calculus with a simple structure. It is to provide a catheter capable of

[0009]

[Means for Solving the Problems]

 Such an object is achieved by the present invention described below.

That is, the present invention is a catheter used by being inserted into a body cavity, which comprises a shaft-shaped body and an operating portion connected to the shaft-shaped body, and the shaft-shaped body extends over the entire length in the axial direction. A main body having at least two lumens extending a predetermined distance from the distal end, and the main body comprising a first tube having at least two lumens formed therein, and the first lumen is A hole is opened at the tip of the first tube, and a draw wire having one end fixed near the tip of the first tube is inserted into the second lumen, and the main body is A first tube having at least two lumens formed continuously from the portion, and a material having a bending rigidity larger than that of the first tube formed so as to surround the outer circumference of the first tube. Second Chi It is a catheter characterized by comprising a tube.

It is preferable that a device for observing or treating a body cavity is housed in the first lumen.

The operation unit includes a tip control unit, a housing that houses the tip control unit, and a manifold unit that connects the shaft-shaped bodies. The manifold unit and the housing are in communication with each other, and At one end of the shaft-like body, the first lumen is connected to the passage means communicating with the outside, and the pulling wire extending from the second lumen is fixed in the housing through the manifold portion. The tip control means has reached the tip control means, and the tip control means presses the rotary shaft and a disk fixed to the rotary shaft, the rubbing body, and the disk against the friction body to apply an appropriate rotation suppressing force to the rotary shaft. It is preferable that the pulling wire is wound around the rotary shaft body, and the pulling wire moves bidirectionally in the second lumen by rotating the rotary shaft body.

Further, the friction body forming the tip control means is made of a rubber-like substance and, when the tip of the shaft is bent, generates a rotation suppressing force sufficient to maintain the bent state of the tip. Is preferred.

Hereinafter, a preferred embodiment of the catheter of the present invention shown in the accompanying drawings will be described in detail.

<< First Configuration Example >> FIG. 1 (a) shows a first configuration example of the catheter of the present invention. 1 (b) is a sectional view of only the distal end portion of the catheter of FIG. 1 (a), FIG. 2 is a sectional view taken along the line I-I in FIG. 1, and FIG. 3 is a line II-II. FIG.

As shown in these figures, a catheter 100 of the present invention, which is used by inserting it into a body cavity, comprises a shaft-shaped body 1 and an operating portion 30 connected to the shaft-shaped body 1, and a shaft-shaped body 1 Has at least two lumens extending over the entire length in the axial direction, and is composed of a tip portion 2 and a body portion 3 extending a predetermined distance from the tip, and the tip portion 2 has at least two lumens formed therein. It consists of the first tube 4, and the first lumen 6 is open at the tip of the first tube 4, and one end is fixed inside the second lumen 7 near the tip of the first tube 4. The pulling wire 8 is inserted, and the main body 3 surrounds the first tube 4 having at least two lumens formed continuously from the tip 2 and the outer circumference of the first tube 4. Formed, the bending stiffness The second tube 5 is larger than the first tube 4.

That is, the shaft-shaped body 1 is composed of a tip portion 2 extending from the tip by a predetermined distance and a main body portion 3, and lumens 6 and 7 are formed in an inner tube 4 which is a first tube. The lumen 6 is opened at the tip of the inner tube 4. A wire 8 extends through the lumen 7, and the end of the wire 8 is fixed near the tip of the inner tube 4 by a wire tip fixing portion 62 as shown in FIG. 1 (b).

In actual use, an endoscope is detachably inserted into the lumen 6 to observe and diagnose the body cavity.

The tip portion 2 is composed only of the inner tube 4 which is the first tube. A wire 8 to be described later is fixed near the tip of the distal end portion 2, and the distal end portion 2 can be bent by pulling the wire 8 by the operating portion 30. The length of the tip portion 2 is 5 to 30 mm. The outer diameter of the tip portion 2 is 1.0 to 20 mm.

The inner tube 4 is preferably made of a flexible elastic material, and is, for example, various rubbers, polyurethanes, polyvinyl chlorides, ethylene / vinyl acetate copolymers, polyethylenes, or other various elastomers.

The hardness of the material forming the inner tube 4 is Shore A 20 to 100 (ASTM D-2240-64T). If it is less than A20, it will bend due to its own weight, and it will be difficult to insert it into the narrowed portion. If it is more than D60, it will be difficult to bend. Furthermore, it is preferable to provide X-ray contrast by mixing an X-ray contrast agent when forming the inner tube.

The lumen 6 of the inner tube 4 has a diameter such that an optical fiber bundle for imaging and illumination is stored in a sheath and an endoscope having a lens attached to the distal end thereof can be inserted. Specifically, it is 0.2 to 5.0 mm.

The lumen 7 has a diameter that allows the pulling wire 8 to be housed and inserted therein. Specifically, it is 0.1 to 1.0 mm. The tip of the lumen 7 is closed by a wire tip fixing portion 62 for fixing the wire 8.

The distal end portion 2 may be provided with a balloon that blocks blood flow at the distal end of the inner tube 4. When a balloon is provided, a lumen for balloon inflation is provided in the inner tube 4 accordingly.

The body portion 3 is formed continuously from the tip portion 2 and has a double-tube structure in which the outer tube 5 is inserted into the outer circumference of the inner tube 4. The body portion 3 is more rigid than the tip portion 2 in order to fix the body portion 3 so as not to bend even when the tip portion 2 is curved. That is, the inner tube 4 is common to both the tip portion 2 and the main body portion 3, but the outer tube 5 is laminated, and the material of the outer tube 5 is higher in rigidity than the material of the inner tube 4.

The length of the main body 3 is 100 to 2000 mm. The outer diameter is 1.0 to 20 mm. The tip portion 2 and the main body portion 3 have steps corresponding to the thickness of the outer tube 5, but the ends of the outer tube 5 are tapered or curved so that there is no step.

The outer tube 5 is preferably made of a material that has greater rigidity than the inner tube 4 and is less likely to bend. For example, hard vinyl chloride, hard polyurethane, high density polyethylene, polyamide, polyimide, polyethylene terephthalate, fluororesin, etc. are preferable. Not good.

The hardness of the material forming the outer tube 5 is Shore D50 to 90 (ASTM D-2240-64T).

The wire 8 is preferably thinner than the inner diameter of the lumen 7 and has strength that does not cut by the tension applied at the tip and sufficient flexibility that does not affect the tip. Specifically, stainless steel, amorphous alloy Examples thereof include monofilaments or twisted yarns made of polyamide, polyethylene terephthalate, carbon and the like.

4 and 5 show partial cross-sections of the operating portion.

The operation unit 30 includes a tip control unit 14, a housing 13 that houses the tip control unit 14, and a manifold unit 10 that connects the shaft-shaped body 1. The manifold unit 10 and the housing 13 are in communication with each other. At the end surface of the shaft-shaped body 1 in the manifold portion 10, the first lumen 6 is connected to the passage means 11 communicating with the outside, and the pulling wire 8 extending from the second lumen 7 penetrates the manifold portion 10. Reaching the tip control means 14 fixed in the housing 13, and the tip control means 14 rubs the rotating shaft body 16 and the disk 17, the friction body 19 and the disk 17 fixed to the rotating shaft body 16. It is composed of a spring 20 that presses against the body 19 and generates an appropriate rotation restraining force on the rotary shaft body 16. The pulling wire 8 is wound around the rotary shaft body 16 to rotate the rotary shaft body 16. It is preferable that the pulling wire 8 moves bidirectionally in the second lumen 7 by and.

Further, the friction body 19 which constitutes the tip control means 14 is made of a rubber-like substance and has a sufficient rotation suppressing force to maintain the curved state of the tip when the tip 2 of the shaft-shaped body 1 is curved. It preferably occurs.

The shaft-shaped body 1 is fitted and fixed to the manifold 10. A port 11 which is a passage means is formed on a side surface of the manifold 10, and an end surface of the lumen 6 and the port 11 are connected by a tube 12. A wire 8 extending from the lumen 7 passes through a manifold 10 and is wound around a winding shaft 15 of a tip controller 14 which is tip control means fixed in a housing 13.

The tip controller 14 includes a disk 17 formed integrally with the shaft 16, a bearing 18, a donut-shaped sheet 19 adhered to the bearing 18, and a spring 20 for pressing the disk 17 against the sheet (friction body) 19. It is composed of a spring stopper 21.

The frictional force between the disk 17 and the sheet 19 causes resistance to the rotation of the shaft 16 to prevent the tip 2 from returning to its original shape when it is bent. Further, when the shaft 16 is pushed in, the disc 17 and the sheet 19 are separated, so that the shaft 16 can be rotated with a light force. Also, by adjusting the spring 20, the rotation restraining force can be changed. The disc 17 may be made of any material as long as it is not deformed. On the other hand, the sheet 19 is preferably made of a material having a friction coefficient as large as possible and resistant to abrasion, for example, various rubbers such as butyl rubber and silicon rubber, and elastomers.

A knob 22 is attached to the shaft 16, and when the knob 22 is rotated in the forward direction, the wire 8 wound around the winding shaft 15 is wound and the wire 8 moves to the proximal end side of the shaft-shaped body 1. .. Since the main body 3 has a double pipe structure and has a large rigidity and is hard to be compressed and deformed, the tip 2 eventually bends starting from the vicinity of the boundary with the main body 3. The larger the rotation angle of the knob, the larger the winding amount of the wire 8, that is, the moving amount, and the larger the tip angle. When the knob 22 is rotated in the reverse direction and returned to the original position, the distal end portion 2 returns to the original state by the elastic force of the inner catheter 4.

The curved state of the tip portion 2 can be changed by the length of the tip portion 2. That is, if the length of the front end portion 2 is made longer, the bending radius becomes larger, and if it is made shorter, the bending radius becomes smaller. Therefore, shafts of various lengths may be prepared according to the shape of the part to be used.

A stopper 23 for limiting the rotation angle of the shaft 16 is provided on the bearing 18 in order to prevent cutting due to excessive wire winding.

<< Second Configuration Example >> FIG. 6 is a partial vertical cross-sectional view showing another configuration example of the catheter of the present invention, and FIG. 7 is a cross-sectional view taken along the line III-III in FIG. FIG. 8 is a sectional view taken along line IV-IV.

The shaft-like body 51 includes a tip portion 52 extending from the tip by a predetermined distance and a body portion 53, and lumens 56, 57, 58 and 59 are formed in the inner tube 54. The lumens 56 and 57 are open at the tip of the inner tube 54. The lumens 58 and 59 are arranged at positions symmetrical to each other with respect to the central axis in the cross section of the inner tube 54, and the wires 60 and 61 penetrate therethrough and are fixed near the tip of the inner tube 54, respectively.

The main body portion 53 has a double-tube structure in which an outer tube 55 is fitted around the inner tube 54. In actual use, the endoscope is detachably inserted into the lumen 56, and at the same time, the probe of the electro-hydraulic crusher, the optical fiber for guiding the laser, or the basket forceps is inserted into the lumen 57. Observe and perform therapeutic treatment under monitoring.

9 and 10 are partial sectional views of the operating portion 90.

Ports 71 and 72 are formed on the side surface of the manifold 70, and are connected to the lumens 56 and 57 by tubes 73 and 74, respectively. The wires 60 and 61 extending from the lumens 58 and 59 pass through the manifold 70 and are wound around the winding shaft 77 of the tip controller 76 which is main body inside the housing 75. At this time, the respective wires 60, 61 are wound in reverse.

When the shaft 78 of the tip controller 76 is rotated to the right, the wire 60 wound right around the winding shaft 77 moves to the proximal end side of the shaft 51. The wire 61 wound left is It is loosened and moves to the tip side of the shaft 51. That is, the tip portion 52 can be bent in two directions by changing the rotation direction of the shaft 78, and the bending angle of the tip can be changed by changing the rotation angle of the shaft.

[0045]

【Example】

 Example 1 A catheter tube having a structure shown in FIGS. 1 to 5 was produced. The conditions of this catheter tube are as follows. << Inner tube >> Material: Polyurethane containing X-ray contrast agent Hardness: Shore A 80-100 Outer diameter: Approx. 1.6 mm Total length: Approx. 50 cm Lumen: 2 lumen Lumen for endoscope storage 1 lumen Lumen for wire storage 1 >> Material: Polyvinylidene fluoride Hardness: Shore D60 ~ 90 Outer diameter: About 1.9mm Thickness: About 0.15mm Total length: About 40cm (Tip: About 10cm, Main body: About 40cm) << Endoscope >> Image fiber : Approximately 2000 silica fibers of about 2 to 3 μm are bundled for illumination: Approximately 40 silica fibers of about 50 μm are bundled and arranged on the outer periphery of the image fiber. The above fiber bundle is housed in a Teflon sheath and integrated. To have an outer diameter of about 0.6 mm. In addition, a convex lens is attached to the end surface of the image fiber bundle, and the image of the observation part illuminated by the illumination light is formed on the end surface of the image fiber. << Wire >> Material: Aromatic polyamide Outer diameter: approx. 0.05 mm << Tip controller >> Shaft: φ6 mm, brass Disc: φ20 mm, brass Sheet: Nitrile rubber (Example 2) Of the structure shown in FIGS. A catheter tube was made. The conditions of this catheter tube are as follows. <Inner tube> Material: Fluorine-based elastomer Hardness: Shore D30-50 Outer diameter: Approx. 2.5 mm Total length: Approx. 50 cm Lumen: 4 lumen Lumen for endoscope storage 1 lumen for medical treatment equipment 1 lumen for wire storage 2 << Outer tube >> Material: Polyethylene tetrafluoroethylene (ETFE) Hardness: Shore D70-90 Outer diameter: 2.8 mm Thickness: 0.15 mm Total length: Approximately 40 cm (tip: approximately 10 cm, body: approximately 40 cm) << Endoscope >> Image fiber: Approximately 3,000 silica fibers of about 2 to 3 mm are bundled. Illumination fiber: Approximately 50 silica fibers of about 50 μm are bundled and placed on the outer periphery of the image fiber. Outer diameter is about 0.85 mm, others are the same as Example 1. << Wire >> Material: Aromatic polyamide Outer diameter: about 0.05 mm << Tip controller >> Same as in Example 1.

[0046]

[Effect of the device]

 According to the catheter tube of the present invention, the distal end portion of the catheter tube can be bent easily and surely with a simple structure, so that the inner wall of the body cavity can be observed and medical treatment can be performed.

Further, since the structure is simple, the diameter of the catheter tube can be made smaller, so that the catheter tube can be applied to a lumen having a very small diameter.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a configuration example of a catheter of the present invention.

FIG. 2 is a sectional view taken along line I-I in FIG.

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

FIG. 4 is a partial cross-sectional view of an operation unit in FIG.

5 is a partial cross-sectional view of the operation unit in FIG.

FIG. 6 is a diagram schematically showing another configuration example of the catheter of the present invention.

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

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

9 is a partial cross-sectional view of the operation unit in FIG.

FIG. 10 is a partial cross-sectional view of the operation unit in FIG.

[Explanation of symbols]

1, 51 ... Shaft-shaped body 17,
79 ... Disk 2, 52 ... Tip 18, 8
0 ... Bearing 3,53 ... Main body 19,8
1 ... Sheet 4, 54 ... Inner tube 20,
82 ... Spring 5, 55 ... Outer tube 21,
83 ... Spring stop 6, 7, 56, 57, 58, 59 ... Lumen 22,
84 ... Knob 8, 60, 61 ... Wire 23,
85 ... Stopper 10, 70 ... Manifold 30,
90 ... Operation part 11, 71, 72 ... Port 62 ...
Wire tip fixing portion 12, 73, 74 ... Connection tube 13, 75 ... Housing 14, 76 ... Tip controller 15, 77 ... Winding shaft 16, 78 ... Shaft

Claims (4)

[Scope of utility model registration request] 1. A catheter used by being inserted into a body cavity, comprising a shaft-shaped body and an operating portion connected to the shaft-shaped body, the shaft-shaped body extending at least along the entire length in the axial direction. It comprises a tip portion having two lumens and extending from the tip by a predetermined distance, and a body portion, and the tip portion comprises a first tube having at least two lumens formed therein, and the first lumen is the first tube. An opening is made at the tip of the tube, and a pulling wire having one end fixed near the tip of the first tube is inserted into the second lumen, and the main body is continuous from the tip. A first tube having at least two lumens formed therein, and a second tube formed so as to surround the outer periphery of the first tube and having a bending rigidity higher than that of the first tube. To Characteristic catheter. 2. The catheter according to claim 1, wherein a device for observing or treating a body cavity is housed in the first lumen. 3. The operation section comprises a tip control means, a housing for accommodating the tip control means, and a manifold section for connecting the shaft-like body. The manifold section and the housing are in communication with each other, and the inside of the manifold section. At the end face of the shaft-like body, the first lumen is connected to the passage means communicating with the outside, and the pulling wire extending from the second lumen penetrates through the manifold portion and is fixed in the housing. The tip control means has reached the tip control means, and the tip control means generates a proper rotation suppressing force on the rotary shaft body by pressing the rotary shaft body, a disc fixed to the rotary shaft body, the friction body, and the disc against the friction body. The catheter according to claim 1, comprising a spring, wherein the pulling wire is wound around the rotary shaft body, and the pulling wire moves bidirectionally in the second lumen by rotating the rotary shaft body. Tell. 4. The friction body which constitutes the tip control means is made of a rubber-like substance, and when the tip portion of the shaft is bent, generates sufficient rotation suppressing force to maintain the bent state of the tip. The catheter according to.