JPH0239441Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a bending operation device provided within the operation section of an endoscope.

Generally, a bending section provided at the distal end of an insertion section of an endoscope is bent by pulling a wire through a bending operation knob provided on an operation section. In such a configuration,
If the curved portion is curved too much, accidents such as breakage of the light guide or image guide inserted into the insertion portion may occur. Therefore, by attaching a collision member to the wire and causing the collision member to collide with a stopper, the maximum bending angle of the curved portion is regulated.

Conventionally, the collision surfaces where the collision member and the stopper collide with each other have been formed at a position away from the axis of the wire and perpendicular to the axis. Therefore, when the collision surfaces of the collision member and the stopper collide, bending stress is generated on these collision surfaces, and the collision surfaces are inclined relative to each other due to this bending stress. Then, the collision surface of the collision member slides away from the collision surface of the stopper, so that the collision member shifts in the width direction of the wire passage formed in the bending operation device and comes into strong pressure contact with the side surface of this passage. .
For this reason, the members constituting the passage must have more strength than necessary, and in the worst case, the collision member may dig into the side of the passage, making it impossible to pull the wire, and the curved part may become attached to the patient's body cavity. There is a risk that it will remain curved inside, causing an extremely dangerous situation.

This idea was made based on the above circumstances,
The purpose of this is to generate a force in the direction of attracting each other between the collision members when they collide with the stopper due to the traction operation of the wire, so that the collision members shift and strongly push against the side of the passage. An object of the present invention is to provide a bending operation device for an endoscope that prevents pressure contact.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 6. Reference numeral 1 in the figure is the operation section of the endoscope. The operating section 1 is composed of a main body 2 made of synthetic resin and formed into a hollow shape, and a grip section 4 consisting of a cylindrical grip cover 3. The main body 2 is connected to a universal cord 4a, and is also provided with an eyepiece 5, a gas feed button 6, a suction button 7, an air/water feed button 8, two angle operation knobs 9, and the like. Further, the gripping portion 3 is provided with an insertion opening body 10 for a treatment tool such as forceps, and an insertion portion 11 is connected to the distal end thereof. As is well known, this insertion section 11 has a distal end forming section provided at the distal end of a flexible tube section 12 via a curved section (not shown). Note that one end of the grip cover 3 is joined to the end surface of the main body 2 in a liquid-tight manner via an O-ring 13, and positioned by a protrusion 14 projecting from the end surface.

On the other hand, a bending operation device 15 is built into the operation section 1 . The substrate 16 of this bending operation device 15
is formed longer than the main body 2, and one end thereof is bent at the inner metal fitting 17 of the inner metal fitting 17 and the outer metal fitting 18, which are metal bodies clamped and fixed to one side wall of the main body 2. A pair of tongue pieces 19, 19
The connection is fixed. A frame 20 has one end fixed to the other end of the substrate 16, and a connecting tube (not shown) for connecting the insertion section 11 to the operating section is attached to the other end of the frame 20. There is. The connecting tube and the base end portion of the insertion portion 11 are as follows:
It is covered with an anti-bending member 21 that prevents the insertion portion 11 from being bent excessively. The gripping cover 3 is fixed to the main body 2 by a presser fitting (not shown) attached to the connecting tube.
Further, the outer metal fitting 18 also serves as a connecting body for attaching the eyepiece 5 to the main body 2.

Further, a shaft 22 is protruded from the upper surface of one end of the substrate 16 located inside the main body 2.
An inner sleeve 23 and an outer sleeve 24 are rotatably fitted into the inner sleeve 23 and outer sleeve 24 . Each sleeve 23, 24
One end is provided with a pair of sprockets 25, 2 which are rotatably positioned vertically in the axial direction of the shaft 22.
5 (only one is shown), and the other end protrudes from the main body and is connected to the angle operation knobs 9, 9, respectively. Further, on the upper surface of the other end side of the substrate 16 protruding into the grip portion 4, a partition wall member 26 having a U-shaped cross section is attached to a presser plate 27 via its intermediate side.
is attached and fixed along the longitudinal direction of the board 16. Then, on the outside of both sides of the partition wall member 26, passages 29 are arranged in upper and lower stages by partition walls 28...
...are formed into sections. The partition walls 28 are divided into an inner partition wall 28a and an outer partition wall 28b in the width direction of the passage 29.
8a and 28b are the first members whose longitudinal midway portions and end portions on the sprocket 25 side are erected on the base plate 16;
It is supported and fixed to second support parts 30a and 30.

A mounting plate 31 is erected on the end surface of the partition wall member 26 on the side opposite to the sprocket 25, and a flat holding member 32 having a width larger than that of the partition wall member 26 is bonded and fixed to this mounting plate 31. . The passages 2 are provided at both ends of the holding member 32 in the width direction.
Two notches 33 are formed corresponding to the notches 9. This notch 33 has a hollow cylindrical regulating member 34 with a small-diameter step 34a formed in the middle part in the axial direction.
is provided in a state in which movement in the axial direction is restricted by engaging the stepped portion 34a. This regulating member 3
4 is held by the end of the outer partition wall 28b so as not to come off from the notch 33. Further, a flexible wire guide pipe 35 made of a tightly wound coil or the like, which is inserted over the entire length of the insertion portion 11, is fitted into the regulating member 34 at its base end and fixed by brazing with a brazing material 36a. ing.
A wire 36 is inserted through the wire guide pipe 35 . The tip of this wire 36 is connected and fixed to a piece (not shown) constituting the curved portion,
The proximal end side is guided to the passage 29 described above. aisle 29
A connecting member 37 is connected to the proximal end of the wire 36 led to, and an end of a chain 38 whose midway portion is engaged with the sprocket 25 is connected to the connecting member 37. The collision member 3 is attached to the connecting member 37 in a state perpendicular to the axis of the wire 36.
9 have been planted. A portion of the collision member 39 protrudes outward in the width direction of the substrate 16, and the outer peripheral surface of this protruding portion is formed into a slope 40 forming an acute angle with the end surface thereof.

On the other hand, the first support section 30 erected on the substrate 16
A wall portion 41 formed by bending a part of this substrate 16 or a separate member into an L-shape is provided between a and the second support portion 30 . The substrate 16 of this wall portion 41
A support hole 42 is bored on one side along the width direction of the
This support hole 42 has a threaded portion 43a and a head portion 43b.
A screw 43 having a receiving portion 43c therebetween is rotatably supported via the receiving portion 43c.
That is, this screw 43 has its axis aligned with the wire 36.
parallel to the axis of the substrate 1 and further than the axis of the wire 36
6, and is provided at the outside in the width direction of the threaded portion 4.
The end of 3a is engaged with a support hole 44 formed in the second support part 30. A stopper 45 is hinged to the threaded portion 43a of this screw 43. Since the height of this stopper 45 is formed to be slightly smaller than the height of the passage 29,
When the screw 43 is rotated, the stopper 45 moves back and forth through the passage 28 without rotating. Note that the passage 29 in the portion where the screw 43 is provided is defined by an outer partition wall 28b. A slope 46 having an angle corresponding to the slope 40 of the collision member 39 is formed on one side of the stopper 45 facing the partition wall member 26 side. When the wires 40 collide, the travel of the wire 36, that is, the maximum bending angle of the curved portion in the vertical and horizontal directions is restricted.

On the other hand, the head 43b of the screw 43 is provided with an engagement hole 47 that passes through the head 43b in the radial direction. A locking spring 48 made of a wire bent into a wave shape is provided in the engagement hole 47 with one end thereof engaged.
Further, the other end of the locking spring 48 is in pressure contact with the first support portion 30a in a compressed state. Therefore, the rotation of the screw 43 is restricted by the locking spring 48, and the end surface of the head 43b is brought into pressure contact with the side surface of the wall portion 41 by the restoring force of the locking spring 48, so that the screw 43 is rotated in the direction of exiting from the support hole 42. Movement is regulated.

In the bending operation device 15 configured in this way, when the sprocket 25 is rotated by the angle operation knob 9 and the chain 38 is run in order to bend the bending portion, one passage 29 side in the width direction of the board 16 is rotated. wire 36 is towed,
The wire 36 on the other side of the passage 29 is pushed. The curved portion will therefore be curved in the direction of the wire 36 being towed. Then, when the wire 36 is further towed, this wire 36
A connecting member 37 connecting the base end of the chain 38 to the chain 38
Since the slope 40 of the collision member 39 provided at the front collides with the slope 46 of the stopper 45, the wire 36 can no longer be towed. That is, the maximum bending angle of the bending portion is regulated by the stopper 45.

By the way, the collision member 39 and the stopper 45 have surfaces that collide with each other on an acute slope 4.
0.46, the slope 4 of the stopper 45
When the slope 40 of the collision member 39 collides with the collision member 6, the slope 40 of the collision member 39 slides along the slope 46 of the stopper 45.
Attracted to the 5 side. Therefore, the collision member 3
Since the connecting member 37 to which 9 is attached is displaced in the direction away from the side surface of the partition wall member 26 that forms the passage 29, the connecting member 37 may press strongly against the side surface of the partition wall member 26, or in the worst case, the connecting member 37 may press against the side surface of the partition wall member 26. There is no chance of it getting stuck and not moving.

It should be noted that the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. 7, the collision member 39 may be formed into an L-shape, and the tip thereof may be an abutting portion that collides with the slope 46 of the stopper 45. According to such a configuration, when the abutting portion of the tip of the collision member 39 collides with the slope 46 of the stopper 45, the collision member 39 slides on the slope 46 and is drawn toward the stopper 45. The same effects as in the example can be obtained. That is, when the stopper 45 and the collision member 39 collide, at least one of them is formed into a slope so that the collision member 39 is drawn into a predetermined position of the stopper 45, and when only one is sloped, the other is formed into the slope. It may be formed at the abutting portion that collides with.

As described above, in the present invention, at least one of the collision member and the stopper is formed on a slope,
When a slope is formed on only one side, a contact portion that collides with the slope is formed on the other side, so that when they collide, the collision member is pulled into a predetermined position of the stopper by the slope. Therefore, since the collision member does not shift away from the stopper, the collision member does not come into strong pressure contact with the side surface of the passage or bite into it, making it impossible to pull the wire, unlike in the conventional case.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention,
FIG. 1 is a partially sectional side view of the endoscope operating section, FIG. 2 is a sectional view showing the inside of the operating section, FIG. 3 is a sectional view of the bending operating device along the line shown in FIG. 2, and FIG. 4 is a side view, FIG. 5 is a front view of the tip side of the bending operation device, FIG. 6 is a side view, and FIG. 7 is a plan view of a collision member and a stopper showing another embodiment of the present invention. be. DESCRIPTION OF SYMBOLS 11... Insertion part, 36... Wire, 39... Collision member, 40... Slope of collision member, 45... Stopper, 4
6...Slope of the stoppa.

Claims (1)

[Scope of utility model registration request] The wire is pulled to bend the bending section provided at the distal end of the insertion section of the endoscope, and
In the bending operation device that regulates the maximum bending angle of the bending portion by causing a collision member attached to the wire to collide with a stopper, a slope is formed on at least one of the portions where the collision member and the stopper collide. When a slope is formed on only one side, an abutting portion that collides with the slope is formed on the other side, so that when the collision member and the stopper collide, the collision member is pulled into a predetermined position by the slope. An endoscope bending operation device characterized by: