JPS635683Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an endoscope bending operation device that remotely bends the bending portion of an endoscope insertion portion using a proximal operation unit.

BACKGROUND ART Conventionally, a bending operation device is known in which a pulley is provided in a hand operation section of an endoscope, and a bending section of an endoscope insertion section is operated to bend via a pair of operation wires hooked to the pulley. This bending operation device rotates a pulley to pull one operating wire and let out the other, so while the operating wire on the winding side is pulled, the operating wire on the feeding side is relaxed. There will be slack in the middle. If this sagging phenomenon is left unaddressed, there is a risk that the operating wires will buckle or get entangled and break, or that the bending operation will not be possible.

Therefore, a method has been proposed in which a slack remover is inserted in the middle of the wire, but this method requires a special slack remover to be inserted in the middle of the wire, so it requires less space on the hand control unit. This results in an increase in the size of the hand-held operating section and complicates the configuration.

This invention was made with attention to the above circumstances,
The purpose of this is to absorb slack in the operating wire using the pulley cover without inserting a special slack remover in the middle of the operating wire, thereby simplifying and downsizing the configuration. Another object of the present invention is to provide an endoscope bending operation device that can reliably absorb the slack.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 in FIG. 1 is an endoscope main body, and this endoscope main body 1 is formed by connecting an endoscope insertion section 3 to a hand operation section 2. As shown in FIG. The endoscope insertion section 3 has a flexible tube 4
A distal end portion 6 is connected to the distal end of the endoscope through a bending portion 5, and the bending portion 5 is operated by a bending operation device (described later) using a bending operation lever 7 of the hand operation portion 2, and the endoscope operation portion 3 The curved portion 5 of the can be curved.

The above-mentioned bending operation device is constructed as shown in FIG. That is, a pulley 8 is rotatably provided within the hand operating section 2, and this pulley 8 is moved between the hand operating section 2 by the bending operating lever 7.
The rotation can be controlled from outside. A pair of upper and lower winding grooves 9 and 10 are provided on the outer periphery of the pulley 8.
is formed. The base end portions of the pair of operating wires 11 and 12 are wound around the winding grooves 9 and 10, respectively, and the base end portions are wound from opposite sides. The operating wires 11 and 12 are formed by connecting a winding wire section 13 and a transmission wire section 14,
The proximal end portion of the winding wire portion 13 is connected to the pulley 8.
It is adapted to be wound around the winding grooves 9 and 10, and its base end 15 is attached and fixed to the pulley 8. In addition, each of the transmission wire portions 14, 14
are connected to the distal end portion 6 through wire guides 16, 16 disposed within the endoscope insertion portion 3, respectively. By pulling one of the operating wires 11, 12 and letting out the other operating wire 11, 12, the bending portion 5 can be bent left and right (or up and down).

Winding wire portion 1 of the operation wires 11 and 12
3 and the transmission wire portion 14 are connected via a ring 17 as shown in FIG. That is, the ends of each of the wire parts 13 and 14 are connected to each other by brazing or the like after forming a loop 18 to be hung over the ring 17 and covering with a stopper pipe 19.

On the other hand, a plurality of wire pressers 20 are arranged at certain intervals along the circumferential surface of the pulley 8 so as to be close to and opposite to the circumferential surface portion around which the wrapped wire portion 13 is wound. That is, the wire presser body 20...
consists of a rising plate integrally formed with the C-shaped plate 21, and is provided close enough to touch the circumferential surface of the pulley 8. In addition, each winding wire portion 13,
13 is fitted into the winding grooves 9 and 10 of the pulley 8 and normally does not protrude. Further, each of the wire holding bodies 20 is installed at intervals such that the winding wire portion 13 can be curved and protruded from between the wire holding bodies 20 and can return to the winding grooves 9 and 10 again. For example, as shown in FIG. 2, three wire holding bodies 20 are installed in the vicinity of each position where the winding wire portions 13, 13 enter and leave the pulley 8 and in between.

Incidentally, the plate body 21 is fixed to the main body 22 of the hand-held operating section 2 with screws, as shown in FIG.
In addition, 23 in FIG. 2 is a wire guide 16, 16.
This is a fixing member that supports and fixes the end of the.

Next, the operation of the above embodiment will be described. First, as shown in FIG. 1, when bending the bending portion 5 of the endoscope insertion section 3 in the A direction, the bending operation lever 7 is rotated in the B direction. At this time, the pulley 8 is similarly rotated in the direction B by the bending operation lever 7, as shown in FIG. Therefore, the winding wire portion 13 on one operation wire 11 side is C
The winding wire portion 1 on the other operating wire 12 side is pulled in the direction and wound around the pulley 8.
3 is rolled out in the D direction. Therefore, the transmission wire section 14 on the winding side is pulled and the transmission wire section 14 on the feeding side is pushed out, so that the curved section 5 of the endoscope insertion section 3 can be curved in the A direction.

In the above operation, the operating wire 11 on the winding side is pulled and tensed, but the operating wire 12 on the feeding side is relaxed, so that the winding wire portion 1
3, there will be slack. However, this slack is absorbed by the winding wire part 13 being bent and protruding away from the winding groove 10 between the wire pressers 20. Therefore, sagging due to loosening does not occur between the pulley 8 and the fixing member 23, and the operating wires 11, 12 do not get entangled with each other, and the operating wires 11, 12 do not buckle or break due to repeated rapid bending. can be prevented.

4 and 5 show another embodiment of the present invention, in which each wire presser body 24 is independently formed, for example, by a cylindrical body, and the wire presser bodies 24... forming a threaded portion 25;
It is designed to be fixed to the main body 22 of the hand-held operating section 2 with screws. According to this configuration, the installation interval can be longer than in the case of the above embodiment, and the angle at which the operating wires 11 and 12 separate from the winding grooves 9 and 10 is small and smooth, and the operating wires can easily protrude and are durable. can be improved.

6 and 7 show still another embodiment of the present invention, in which a cover 26 that is close to and covers the winding side peripheral surface of the pulley 8 is cut out in the middle, and the remaining portion is used to hold the wire. The body 27... is formed. Further, each wire presser body 27 is connected together, and a cover portion 28 is formed to cover the upper surface of the pulley 8, thereby making it difficult to deform.

As explained above, the present invention has a plurality of drop-off prevention devices that face the peripheral surface of the pulley around which the operating wire is wound, and which allow the slack portion of the operating wire to curve and protrude and return to the winding groove. A wire holding body is installed at least near the position where the operating wire enters and exits from the pulley. Therefore, there is no absolute need to insert a specially constructed slack remover in the middle of the operating wire to remove the slack in the operating wire, and a simple structure in which a wire holding body is installed around the pulley can remove the slack. can be absorbed. Further, by simplifying and downsizing the configuration, the entire hand-held operating section can be downsized and lightened. Therefore, the operability of the hand-held operating section can be improved.

Furthermore, there is no slack in the operating wire between the pulley and the fixing member of the wire guide, for example, and even if it does, the slack is extremely small, so the operating wire will not be bent sharply in this area and will not buckle. . Furthermore, the operating wire is less likely to break due to repeated bending, and its durability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an endoscope showing an embodiment of the present invention, FIG. 2 is a configuration diagram of the bending operation device in the hand operation section, FIG. 3 is a side view of the pulley portion, and FIG. 5 is a side view of the pulley portion showing another embodiment of the present invention; FIG. 6 is a plan view of the pulley portion showing yet another embodiment of the present invention; FIG. FIG. 7 is a side view of the pulley portion. 2... Hand operation part, 3... Endoscope insertion part, 5... Curved part, 8... Pulley, 9, 10... Winding groove, 11,
12... Operation wire, 13... Winding wire part, 14
...Transmission wire part, 20... Wire presser body, 27... Wire presser body.

Claims (1)

[Scope of utility model registration request] By winding the proximal end portions of a pair of operating wires connected to the curved portion of the endoscope insertion section around a pulley provided in the hand operating section of the endoscope from opposite sides, and rotating the pulley. In an endoscope bending operation device that pushes and pulls a pair of operating wires to bend the bending portion, a winding groove is formed on the circumferential surface of the pulley, and a circumferential portion of the pulley around which the operating wire is wound. A plurality of wire retainers are installed at least at the position where the operating wire enters and exits from the pulley, and so that the slack portion of the operating wire can be curved and protruded and returned to the winding groove. An endoscope bending operation device characterized in that each device is installed nearby.