Handle locking mechanism of endoscope operating hand wheel

Abstract

The invention discloses a handle locking mechanism of an endoscope operating hand wheel. A small shaft screw cap fixedly sleeves a small rotating shaft; left and right rotary hand wheels sleeve the small shaft screw cap; a friction pad is arranged in an inner cavity of the small shaft screw cap; a spring and a pressing plate are arranged in the friction pad sequentially from bottom to top; an inner cover is arranged at the upper side of the pressing plate; a cam is fixedly arranged at the bottom of the inner cover; the bottom of a driving block of the cam is of a stepped structure; a low-order surface, a middle-order surface and a high-order surface are arranged at the bottom of the driving block; the middle-order surface or high-order surface of the driving block is pressed on the pressing plate; outer teeth are arranged at the upper side of the outer wall of the inner cover; and the outer teeth are meshed with tooth grooves in the inner wall of a wrench socket. The handle locking mechanism provided by the invention can offer effective locking force, and the left and right rotary hand wheels can still rotate after a locking action is implemented; a rotating torque is reliable in transfer; a rotating position of a bent operating knob can be reliably fixed by operating force, which is lower than original force, in a non-bias mode; and under a loose state, operating force, which is required to rotate the left and right rotary hand wheel, is low, and the hand wheels are light and flexible.

Description

technical field [0001] The invention belongs to the technical field of medical instruments, and in particular relates to a locking mechanism for an endoscope operating handwheel handle. Background technique [0002] The operating handle of the medical gastrointestinal endoscope is equipped with a curved hand wheel, which is used to control the bending action of the end of the endoscope lens. The medical staff can maintain the bending angle of the end of the endoscope lens through the handwheel locking mechanism, so that the doctor can better It is also required that the medical staff can still turn the handwheel in the locked state. [0003] At present, the left and right curved hand wheel locking mechanisms in most domestic gastrointestinal endoscope products use metal sheets to clamp friction parts to provide the friction force required for locking. In the structure disclosed in Japanese Patent Application Laid-Open No. 10-286220, since the friction member is elastically ...

AI Technical Summary

Problems solved by technology

In the structure disclosed in Japanese Patent Application Laid-Open No. 10-286220, since the friction member is elastically deformed by sandwiching the movable member and the fixed member, the friction member tends to deteriorate due to multiple elastic deformations. , as a result, there is a problem that after many times of use, the friction force of the friction member against the inner peripheral surface of the bending operation knob decreases, that is, the friction force of the friction member deviates

Moreover, in order to make the plastic pad 16 produce elastic deformation, it is necessary to use a relatively large force to clamp the plastic pad 16 through the stop plate 17 and the pressure plate 3, and the movement between the inner cover 1 and the handle main shaft 5 is converted into axial motion through the screw thread To realize the compression or release of the plastic pad 16, so there is a problem that the wrench set 2 that rotates the inner cover 1 must be rotated with a large force

At the same time, the friction force after the assembly of the inner cover 1 and the handle spindle 5 is related to the assembly experience, and there is no quantitative index to guide the assembly

The connection between the inner cover 1 and the wrench set 2 is also unreliable. During the rotation, the wrench set and the inner cover tend to slide relative to each other.

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