JP2000354633A - Production of treatment jig inserting pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a treatment jig inserting pipe having a good protruded part uniformly formed to the entire periphery thereof radially in good workability without requiring large-scaled equipment. SOLUTION: In a method for producing a treatment jig inserting pipe wherein a coil body 27 is fitted to the outer periphery of a flexible tube 26 and the parts positioned between the strands of the coil body 27 are outwardly protruded in a radial direction, a densely wound coil body 29 having an outer diameter slightly smaller than the inner diameter of the tube 26 is inserted in the tube 26 to be held to an arcuate state having a predetermined radius of curvature and a predetermined circumferential angle and rotated around its center line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a treatment instrument insertion tube used for an endoscope or the like.

[0002]

2. Description of the Related Art In order to guide a treatment tool such as forceps through an endoscope, a flexible treatment tool insertion tube is provided in the endoscope. By the way, if a simple plastic tube is used as the treatment instrument insertion tube, for example, a hip break (a phenomenon in which a part of the tube becomes flat and breaks at an acute angle) is likely to occur when the tube is bent. I have to use something big. However, there is a strong demand for a treatment instrument insertion tube for an endoscope that has as small an outer diameter as possible.

[0003] In view of the above, the one shown in FIG. 9 has been proposed. As shown in FIG. 9, this treatment instrument insertion tube fits the coil 2 around the outer periphery of the flexible tube 1 and is located between the strands 3 of the coil 2 on the outer periphery of the tube 1. The portion is formed as a raised portion 4 that protrudes radially outward. Thus, when the tube 1 is bent, the protruding portion 4 located outside the curved portion expands and disperses the tensile force, and the protruding portion 4 located inside the curved portion is compressed to suck the tensile force. Therefore, the tube 1 does not break due to the bending, and the diameter can be reduced.

[0004]

[Problems to be Solved by the Invention]
However, the above-mentioned conventional method does not particularly disclose a method of forming the raised portion. The first conceivable method for forming such a ridge is to insert a tightly wound coil having an outer diameter slightly smaller than the inner diameter of the tube into which the coil is inserted, and to form a ridge. Is to bend by hand or machine as many times as necessary at the position. According to this method, it is possible to form a ridge, but it is extremely difficult to form a uniform ridge over the entire circumference in the radial direction and in the longitudinal direction. In addition, workability is not very good even when bending with a machine.

It is also conceivable to close one end of the tube in which the coil body is inserted, place it in a high temperature state, and apply a high pressure from the other end to form a desired raised portion. For example, the tube bulges even in a portion where the coil body is not inserted, and it is not preferable to use this as a treatment tool insertion tube for an endoscope. Further, an apparatus for realizing the present method becomes large-scale.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to form an evenly good protrusion over the entire circumference in the radial direction.
An object of the present invention is to provide a method for manufacturing a treatment tool insertion tube which has good workability in manufacturing and does not require large-scale equipment.

[0007]

The invention according to claim 1 is
In a method for manufacturing a treatment instrument insertion tube in which a coil body is inserted into the outer periphery of a flexible tube and a portion located between wires of the coil body is raised radially outward, the inside diameter of the tube is slightly smaller. A closely-wound coil body having an outer diameter is inserted into the tube, held in an arc shape having a predetermined radius of curvature and a circumferential angle, and manufactured by rotating around the center line. This is a method for manufacturing a treatment instrument insertion tube.

According to a second aspect of the present invention, the close-wound coil body is inserted into the tube such that a part thereof is exposed, and the entire length or a part of the outer peripheral coil and the exposure of the close-wound coil body are exposed. The heat-shrinkable tube is covered over the portion and shrunk, the tightly wound coil body exposed portion is fixed by a chuck via the heat-shrinkable tube, and the treatment instrument insertion tube of the endoscope is provided with a predetermined radius of curvature and a predetermined circumferential angle. 2. The method for manufacturing a treatment tool insertion tube according to claim 1, wherein the chuck is held in an arc shape, and the chuck is rotated by a rotation mechanism to manufacture.

According to a third aspect of the present invention, the means for holding the treatment instrument insertion tube in an arc shape having a predetermined radius of curvature and a circumferential angle is provided.
The width and the depth are slightly larger than the outer diameter of the outer coiled portion of the treatment instrument insertion tube of the endoscope, and the shape includes at least a part of an arc having a predetermined radius of curvature and a circumferential angle. 2. The method for manufacturing a treatment instrument insertion tube according to claim 1, comprising a plate member having a groove and a lid plate corresponding thereto.

The invention according to claim 4 is the method for manufacturing a treatment instrument insertion tube according to claim 2, wherein the mechanism for rotating the chuck is manually operated.

The invention according to claim 5 is the method for manufacturing a treatment instrument insertion tube according to claim 2, wherein the mechanism for rotating the chuck uses an electric motor as a drive source.

According to a sixth aspect of the present invention, there is provided the treatment tool according to the fifth aspect, wherein the operation of the electric motor is automatically stopped after a lapse of a predetermined time from the start of the operation using a timer mechanism. This is a method for manufacturing an insertion tube.

[0013]

FIG. 1 to FIG. 4 show a first embodiment of the present invention.

In FIG. 1, reference numeral 11 denotes a rotary operation device. The rotation operating device 11 has a mounting fixture 12 and is fixed to, for example, an end of a desk using the mounting fixture 12. Further, the rotation operating device 11 is provided with a rotation shaft 13 and an operation handle 14, and when the operation handle 14 is turned, the rotation shaft 13 is driven via a built-in gear mechanism (not shown).
Is designed to rotate. A chuck 15 is coaxially mounted on the rotating shaft 13. Further, a support plate 17 projecting horizontally through a fixing plate 16 is attached to a main body portion of the rotary operation device 11, and a forming plate 18 is attached and fixed to a top surface of a projecting end of the support plate 17. This molded plate 1
As shown in FIG. 4, a holding groove 19 having a U-shaped cross section is carved in the upper surface of 8, and is arranged in a semicircular shape as shown in FIG. One point B where the center line of the holding groove 19 intersects with the end face 11 of the forming plate 18 coincides with the center axis of the rotating shaft 13, and the center axis of the rotating shaft 13 is held at the point B. The groove 19 is tangent to the center line (semicircular) of the groove 19. The chuck 15
Is desirably as close as possible to the point B as long as the tip of the chuck 15 does not touch.

A hook 21 is provided on the upper surface of the support plate 17. A guide receiving groove 22 is provided at the upper end of the fixing plate 16.
Are formed. The line connecting the hook 21 and the guide receiving groove 22 coincides with the center of the other end of the holding groove 19.

Further, a lid 23 shown in FIG. 1 is joined to the upper surface of the molded plate 18, and the lid 23 is fastened to the molded plate 18 by a thumb screw 24 passing therethrough. The lid 23 closes the upper opening of the holding groove 19.

On the other hand, the treatment instrument insertion tube 25 as a product to be manufactured is composed of a thin tube 26 made of, for example, a fluororesin material and a roughly wound coil body 27 fitted on the outer periphery of the thin tube 26 to be combined as shown in FIG. Consists of Coil body 27
Is fitted over the outer periphery of a portion 26a of which the outer diameter is reduced by molding the one end portion of the thin tube 26 over a desired length. The cross section of the wire 28a of the coil body 27 has a flat shape that is long in the longitudinal direction of the thin tube 26. As described above, the cylindrical body 28 is fitted into the end portion of the thin tube 26 near the coil winding portion so as to expand the inner periphery of the thin tube 26.

Incidentally, the inner diameter of the coil body 27 is formed to be slightly smaller than the outer diameter of the thin tube 26 in the portion to be wound. A closely wound coil 29 is fitted into the thin-walled tube 26 over a range including the wound portion of the coil body 27. Further, a heat-shrinkable tube 31 is covered so as to cover the whole or a part of the winding portion of the coil body 27 and the exposed outer peripheral surface of the close-wound coil 29 located on the cylindrical body 28 side. After covering, the heat shrinkable tube 31 is shrunk by heating. The structure thus configured is referred to as a group 32. The holding groove 19 of the forming plate 18 has a depth and a width slightly larger than the diameter of the group 32.

Therefore, as shown in FIG. 2, the above-mentioned set 32 is inserted into the holding groove 19, and the end of the set 32, that is, the heat-shrinkable tube 31 is brought into direct contact with the peripheral surface of the close-wound coil 29. Is held by the chuck 15. Further, the treatment instrument insertion tube 25 is hooked on the hook 21 on the support plate 17 and reaches the guide receiving groove 22. After this, the lid 2
3 is fitted on the forming plate 18 to close the holding groove 19,
It is fastened and fixed by the thumb screw 24. When such preparation is completed, the operation handle 14 of the rotary operation device 11 is turned. As a result, the rotating shaft 13 and the chuck 15 rotate, and the treatment instrument insertion tube 25 and the tightly wound coil 29 fixed by the heat shrink tube 31 rotate integrally without slipping with each other. I do.
At this time, since the assembly 32 is pressed by the lid 23, it does not jump out of the holding groove 19 and smoothly rotates in the holding groove 19. Thus, in the semicircular holding groove 19, the assembly 32 is rotated around its center line at a predetermined rotation speed and rotation speed.

Thus, the above-described set 32 has the same effect as being uniformly curved over the entire circumference in the radial direction. That is, on the outside of the bend it is pulled and on the inside it is compressed. This is repeated many times by rotation, so that the thin tube 26 plastically deforms in a slightly extending direction. When the part extended by plastic deformation comes inside the curve and is compressed, this part becomes a bulge and absorbs the compressive force. However, since the close-wound coil 29 is inserted inside the thin-walled tube 26, the raised portion is formed only on the outside. In addition, since the portion in contact with the coil body 27 cannot be raised by being pressed by the inner surface of the coil body 27, it can be raised only in the gap between the strands of the coil body 27. Then, the action of the tension and the compression is uniformly applied to the entire circumference in the radial direction of the thin tube 26 by the operation of rotation, so that the raised portion is also formed uniformly to the entire circumference in the radial direction of the thin tube 26. It is. Therefore, a treatment instrument insertion tube for an endoscope as shown in FIG. 9 is obtained. Note that the hook 21 is not particularly necessary in the above embodiment.

FIG. 5 shows a second embodiment of the present invention in which the length of the holding groove 19 formed in the formed plate 18 in the above embodiment is an arc longer than a semicircle. is there. According to this, when the curvature radius of the holding groove 19 is the same, the length of the holding groove 19 can be increased.
That is, the range in which the raised portion can be formed can be lengthened.

FIG. 6 shows a third embodiment of the present invention, in which one end of the holding groove 19 of the second embodiment is bent and further extended.

FIG. 7 shows a fourth embodiment of the present invention. In this configuration, the lid 23 is opened and closed in a hinged manner, and is locked in a closed state by a locking plate 34 and a locking pin 35. This improves workability.

FIG. 8 shows a fifth embodiment of the present invention. In this embodiment, a motor 41 is used as a drive source as a mechanism for rotatingly driving the rotating shaft 13. And the motor 4
1 is connected to the rotating shaft 13 via a pulley 42, a belt 43 and a pulley 44. The motor 41 is connected to a power supply 47 via a timer mechanism 46. The timer mechanism 46 has a switch button 48.
When the motor 8 is operated, the motor 41 is driven for a preset time.
Is energized.

Then, during the set time, the rotating shaft 13 is driven to perform the above-described operation, and stops automatically after the lapse of the set time. The pulleys 42, 4
4 by changing the ratio of rotation 4
3 can be rotated.

In this way, since there is less rotation unevenness and the rotation speed and the total number of rotations can be controlled accurately as compared with the manual operation, there is little variation in quality. In addition, since it does not depend on humans, efficiency can be improved accordingly.

The cross-sectional shape of the holding groove 19 may be rectangular. Further, the present manufacturing method is not limited to the endoscope, but can be applied to similar technical fields in other fields.

[0028]

As described above, according to the manufacturing method of the present invention, the raised portion can be formed in a good condition uniformly over the entire circumference in the radial direction, and the workability in the manufacturing is good.
Further, the treatment instrument insertion tube can be manufactured without requiring a large-scale facility.

[Brief description of the drawings]

FIG. 1 is a perspective view of a manufacturing apparatus according to a first embodiment.

FIG. 2 is a side sectional view of the assembly.

FIG. 3 is a plan view of a main part of the device.

FIG. 4 is a side view of the molded plate.

FIG. 5 is a plan view of a formed plate according to a second embodiment.

FIG. 6 is a plan view of a formed plate according to a third embodiment.

FIG. 7 is a perspective view of a formed plate according to a fourth embodiment.

FIG. 8 is a plan view of a fifth embodiment.

FIG. 9 is a side sectional view of a conventional treatment instrument insertion tube.

[Explanation of symbols]

11 ... rotary operation device, 13 ... rotary shaft, 15 ... chuck,
18: molded plate, 19: holding groove, 23: lid, 25: treatment instrument insertion tube, 26: thin tube, 27: coil body, 2
9: Closely wound coil, 31: Heat shrinkable tube, 32: Assembly.

Claims (6)

[Claims] 1. A method of manufacturing a treatment instrument insertion tube, wherein a coil body is inserted around the outer periphery of a flexible tube and a portion located between wires of the coil body is raised radially outward. A tightly wound coil body with an outer diameter slightly smaller than the inner diameter of
A method for manufacturing a treatment instrument insertion tube, comprising: inserting the tube into the tube; holding the tube in an arc shape having a predetermined radius of curvature and a circumferential angle; and rotating the tube around the center line. 2. The heat-shrinkable tube is inserted into the tube so that a part of the tightly wound coil body is exposed, and extends over the entire length or a part of the outer peripheral coil and an exposed part of the closely wound coil body. Covering and exposing the tightly wound coil body exposed portion with a chuck via a heat-shrinkable tube, and holding the treatment instrument insertion tube of the endoscope in an arc shape having a predetermined radius of curvature and a circumferential angle; The method for manufacturing a treatment instrument insertion tube according to claim 1, wherein the chuck is manufactured by rotating the chuck by a rotation mechanism. 3. A means for holding the treatment instrument insertion tube in an arc shape having a predetermined radius of curvature and a circumferential angle, wherein the width and depth of the outer circumference coil winding portion of the treatment instrument insertion tube of the endoscope are changed. Is slightly larger than the outer diameter of the plate, and is formed of a plate material having a groove including at least a part of an arc having a predetermined radius of curvature and a circumferential angle, and a corresponding cover plate. Claim 1
3. The method for producing a treatment instrument insertion tube according to item 1. 4. The method according to claim 2, wherein the mechanism for rotating the chuck is manually operated. 5. The method for manufacturing a treatment instrument insertion tube according to claim 2, wherein the mechanism for rotating the chuck uses an electric motor as a drive source. 6. The method according to claim 5, wherein a timer mechanism is used to stop the operation of the electric motor automatically after a lapse of a predetermined time from the start of the operation.