JPS6115841Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in an endoscope operating wire traction device that remotely operates a curved tube section for changing the direction of the distal end of an endoscope, a forceps lifting mechanism, or the like.

Generally, an endoscope is provided with a forceps outlet at the distal end of an insertion portion, and is provided with a lifting mechanism within the outlet for regulating the direction in which the forceps are guided out. FIG. 1 shows a lifting mechanism in a side-viewing endoscope.

That is, the configuration is such that an elevator 3 is pivotally attached to the inner bottom of the outlet 2 of the distal end portion 1, and the forceps 4 are guided out along the elevator 3. Furthermore, the elevating table 3 is connected to the tip of an operating wire 5, and the elevating table 3 can be appropriately raised by being pulled by a hand control unit (not shown) of the endoscope. . In other words, as shown in FIG. 2, the raising table 3 is raised against the elastic restoring force of the forceps 4 along the raising table 3, and the tip of the forceps 4 is guided to a desired position within the observation field. be.

On the other hand, in the hand operation section of the endoscope, as shown in FIG. 3, an operation wire pulling device is provided which pushes and pulls the operation wire 5 using a rack 6 and a pinion 7. That is, the pinion 7 is connected to an operating knob 8, and the operator operates the operating knob 8 by turning it by hand.

However, in order to raise the forceps 4, the forceps 4 and the like must be pulled against the repulsive force, so when the operator releases the operating knob 8, the forceps 4 and the like do not return to their original positions due to the repulsive force. It is necessary to provide a certain degree of holding force. For this reason, conventionally, a friction cork 9 is attached to the side surface of the operation knob 8, and this is attached to the operation part main body 10.
A spring 11 provided on the side is configured to slide, and its frictional force allows it to be held at each traction position. Therefore, when raising the forceps 4, it is necessary to pull the forceps 4 with a traction force that is the sum of the repulsive force of the forceps 4 and the sliding resistance thereof, resulting in an extremely heavy operation. Note that, originally, the above-mentioned sliding resistance is completely unnecessary at the stage of raising the forceps 4. Moreover, although it depends on the lever ratio of the raising table 3, the tensile force thereof is generally quite large, and the sliding resistance is accordingly very large.

As described above, in the case of the conventional wire traction device, the amount of rotational force of the operation knob is extremely large, making operation difficult and often causing pain to the operator.

Therefore, the inventor first developed an endoscope operation wire traction device with the following configuration, which has improved operability and can operate the operation knob without applying any frictional load in the direction of pulling the operation wire. I thought about things.

That is, FIGS. 5 and 6 are the first examples. To explain this example, reference numeral 21 in FIG. 5 is a shaft member, and a mounting collar portion 22 formed at one end of the shaft member is screwed and fixed to the wall portion of the operating section main body 23 of the endoscope. An operating knob 25 that also serves as a moving operating body is rotatably attached to the shaft portion 24 of the shaft member 21 . A pinion 26 is integrally formed at one end of the operating knob 25. Further, a rack 27 is engaged with the pinion 26, and by rotating the operation knob 25, the pinion 26 is rotated and the rack 27 is moved. And in the rack 27 above,
A manipulation wire is connected to the wire so that, for example, a lifting mechanism of the forceps can be manipulated. In other words, the operating wire 5 is connected to the raising base 3 of the raising mechanism for the forceps 4, and is configured to be able to raise the raising base 3 by being pulled.

Note that 28 in FIG. 5 is a guide for guiding the rack 27 so that it does not come off.

Further, a one-way clutch 29 is built inside the operating knob 25, and the operating knob 25 is further connected to a friction load generating mechanism 30, which will be described later, via the one-way clutch 29. As shown in FIG. 6, the one-way clutch 29 is provided with a wheel 32 having a plurality of triangular notches 31 on its periphery inside the operating knob 25, and rollers 33 inside the triangular notches 31, respectively. It contains Then, when the operation knob 25 is turned in the direction A shown in FIG. 6, the rollers 33 play within the triangular notches 31, thereby interrupting the transmission. Also, when the operating knob 25 is turned in the direction B, the triangular notch 31... and the operating knob 25
It bites between the inner surfaces of the two and fixedly connects the two to enable transmission.

In addition, the friction load generating mechanism 30 has a friction cork material 34 pasted on the side surface of the wheel 32, and a spring member 35 is attached to the wall of the operation section main body 23 opposite to this, and the spring member 35 is applied to the friction It is made to come into sliding contact with the cork material 34 for use. That is, the cork material 34 and the spring member 3
5 constitutes a friction member, and the spring member 35 itself constitutes an elastic member for urging. Therefore, when the wheel 32 rotates, it always receives frictional force and generates a load.

Next, the operation of the operating wire pulling device will be explained.

First, when pulling the operating wire to operate the raising mechanism of the forceps, the operating knob 25 is rotated in the direction A in FIG. 6. When rotating in this A direction,
Since the one-way clutch 29 is disconnected, the connection with the friction load generating mechanism 30 is broken, and the operating knob 25 rotates independently. In other words, the friction load generating mechanism 30
It can be rotated without receiving any load. Therefore, a traction force corresponding only to the repulsive force received when raising the forceps 4 is sufficient, and the forceps 4 can be easily operated.

When the desired lifting amount is indicated, if the operating knob 25 is left alone, the repulsive force is applied to the operating knob 25.
5, but in this case, the operating knob 25 attempts to rotate in the direction B in FIG. 6, so the one-way clutch 29 becomes connected. Therefore, it receives the load of the friction load generating mechanism 30, and its rotation is prevented. In other words, the forceps stop at the raised position and are held as they are.

Furthermore, in order to return the raised forceps to their original position, the operation knob 25 is rotated in the direction B in FIG. Therefore, sufficient rotation can be achieved with a force considerably smaller than the load of the friction load generating mechanism 30.

However, it has been found that the above operating wire pulling device has the following drawbacks. That is, when the operation knob 25 is rotated in a certain direction,
Since the rollers 33... have a margin (play) within the triangular notches 31..., there is always some rotational play, and even if the rotation is stopped, it does not stop immediately at that point, but the rotation returns by a certain amount (backlash). In other words, since the forceps cannot be stopped at each raising position, it takes effort and time to obtain the desired raising angle.

This invention was made with attention to the above circumstances,
The purpose is to provide an endoscope operating wire traction device that has a simple configuration and can be operated without any frictional load and play in the direction in which the operating wire is pulled, improving operability. It's about doing.

FIG. 7 shows a unidirectional friction load body portion according to an embodiment of the present invention.

That is, this one-way friction load body 36 has a plurality of sector-shaped cam pieces 38 pivotally attached to the circumference of a wheel 37, and only when the operating knob 25 rotates in the direction B in the figure, the unidirectional friction load body 36 moves inside the circular area of the operating knob 25. It is adapted to press into engagement with the peripheral surface. The wheel 37 and the operating knob 25 respectively correspond to the configuration shown in FIG. 5 described above. The sector-shaped cam 38
. . . are respectively operated by springs 39 . . .
is biased so as to come into pressure contact with the inner circumferential surface of.

As described above, when the operating knob 25 is rotated in the direction A, the fan-shaped cam pieces 38 do not come into contact with the inner circumferential surface of the operating knob 25 but only slide thereon. Therefore, the connection with the friction load generation mechanism 30 is disconnected, and the operation knob 25 does not receive any load from the friction load generation mechanism 30, that is, it responds only to the repulsive force received when raising the forceps 4. The traction force is sufficient and it can be operated easily.

When the desired lifting amount is indicated, if the operating knob 25 is left alone, the repulsive force is applied to the operating knob 25.
In this case, since the operation knob 25 tries to rotate in the direction B in FIG. becomes connected. At this time, the fan-shaped cam pieces 38 are pressed against the inner peripheral surface by the springs 39. Therefore, when the operating knob 25 is left alone, it is immediately pressed into engagement and there is no play. Then, the friction load generating mechanism 30 immediately
is subjected to a load, and its rotation is prevented. In other words,
The forceps stop at the raised position and are held there.

Furthermore, when returning the raised forceps to their original position, the operating knob 25 is rotated in the direction B in FIG. Therefore, it can be rotated lightly with a force less than the load of the friction load generating mechanism 30.

Furthermore, according to this configuration, if the tip of the forceps is raised more than necessary and pressed against the patient's body cavity wall, the one-way friction load body 36 will automatically move due to the reaction in the direction A. The engagement is released and the operating wire 5 is returned to ensure safety.

FIG. 8 shows another embodiment of the present invention, in which this one-way friction load body 43 is provided with a cam piece 45 that is directly connected to a rack 44 that also serves as a moving operation body. The piece 45 is brought into pressure contact with the back surface of the rack 44 by a spring 46. Then, only when the rack 44 is to be moved in the A direction, the cam piece 45 generates frictional resistance in the direction in which it bites into the rack 44, thereby preventing its free movement. Moreover, this constitutes a friction load generating mechanism. In this embodiment, the cam piece 45 itself constitutes a friction member, and the spring 46 constitutes an elastic member for urging the same.

As explained above, in the present invention, the one-way friction load body is cut off in the direction in which the operation wire is pulled, and the connection with the friction load generation mechanism is cut off.
In the opposite direction, the one-way friction load body is immediately connected and the friction load generation mechanism is immediately activated. In other words, when pulling the operating wire, it can be operated only by the force that rebounds from the pulling, and it is not subjected to any load from the frictional load generating mechanism, which makes the operation lighter and improves operability. First, it eliminates play during operation. Furthermore, safety can be ensured by the structure that can automatically release the crimp engagement when a reaction is received through the operation wire.

[Brief explanation of the drawing]

Figures 1 and 2 are side sectional views of the main parts of the distal end of a conventional endoscope, Figure 3 is a side sectional view of a conventional operating wire traction device, and Figure 4 is taken along the line - in Figure 3. 5 is a longitudinal sectional view of a certain traction device, FIG. 6 is a sectional view taken along the line - in FIG. . 25...operation knob, 26...pinion, 27...
...Rack, 36...One-way friction load body, 30...
Friction load generation mechanism, 43... one-way friction load body.

Claims (1)

[Claims for Utility Model Registration] (1) A movable operating body connected to an endoscope's operating wire and moved by an operating knob to push and pull the operating wire, and the operating wire being pulled in the opposite direction. A cam-shaped one-way friction load body whose frictional force increases to brake the movable operating body when the operating wire is pulled, and whose frictional force decreases in the direction of pulling the operating wire; and the one-way friction load body is attached to the movable operating body. 1. An endoscope operation wire indexing device, characterized in that the endoscope operation wire indexing device is composed of an elastic member that exerts force. (2) Registration of a utility model characterized in that the movable operating body is comprised of an operating knob having a pinion formed at one end that meshes with a rack to which the operating wire is connected, and the one-way friction load body is comprised of a sector-shaped cam piece. An operating wire traction device for an endoscope according to claim 1. (3) The endoscope according to claim 1, wherein the movable operating body is a rack to which an operating wire is connected, and the one-way friction load body is a cam piece. Operation wire traction device.