Preparation method of snake bone device of endoscope

Abstract

The invention relates to a preparation method of a snake bone device of an endoscope. The method comprises the following specific steps: machining a front section ring, comprising raw material cutting, center hole machining, directional key shape bending after machining, large hole diameter turning, steel wire rope perforation machining, polishing and de-burring; machining middle section rings, comprising raw material cutting, center hole machining, first bent directional key shape machining, first bent directional concave body structure and steel wire rope perforation machining, polishing andde-burring; machining a rear section ring, comprising raw material cutting, center hole machining, large hole diameter turning, front bent directional concave body structure and steel wire rope perforation machining, polishing and de-burring; and finally, assembling the front section ring, the middle section rings and the rear section ring into a whole through a steel wire rope. The preparation method is simple and reasonable, the machining difficulty is reduced, the machining cost is reduced, the angle of bend cannot deviate after the snake bone obtained through assembly is bent, and the positioning precision of the angle of bend is guaranteed.

Description

technical field [0001] The invention relates to a snake bone device, in particular to a preparation method of the snake bone device of a medical flexible tube endoscope and an industrial flexible tube endoscope, and belongs to the technical field of medical devices. Background technique [0002] The existing endoscopes use a built-in metal snake bone joint to bend and change the direction of the head, and bend it by pulling the control wire connected to it. The metal snake bone depends on the joints of each joint If the connecting shafts are connected to each other and then rotated axially to work, the shafts in the same direction (on the plane) have bending in both positive and negative directions, and there are two bending directions in the positive and negative directions of the two axis planes where the two axes are perpendicular to each other. , to obtain the corners in four directions, which are usually called the corners in the four directions of up, down, left and ri...

AI Technical Summary

Problems solved by technology

[0004] First, if the axis of the riveting tooling and the rivet are not on the same axis or the riveting force is too large, it will cause deformation of the riveting part of the middle segment ring of the snake bone;

[0005] Second, in the riveting process, if the riveting pressure is too large, the surface of the workpiece is easily damaged or the rivet is deformed or the rivet head is cracked;

[0006] Third, the riveted workpiece is prone to incomplete riveting, or the phenomenon that the riveting is not strong enough; therefore, the requirements for workers' riveting skills are relatively high, which makes the production efficiency low, and it is also relatively easy to have unqualified riveting quality. Sometimes the rivets will fall off, resulting in many defects in the final product and a high scrap rate, which makes the production cost higher;

[0007] Fourth, even if the processing accuracy is high, there are still insurmountable dimensional tolerances in the processed snake bone front segment ring, snake bone middle segment ring and snake bone rear segment ring. At the same time, the front segment ring and middle segment ring in the riveting process The respective connecting ears of the joint ring and the rear joint ring will be deformed, resulting in a large tolerance error in shape and position. After riveting, the accumulated error of the snake bone is large, and the gap between the rivets cannot be guaranteed, so that no matter which snake bone device is finally produced The corner of the direction, the shape after the corner has a position that deviates from the bent axial plane, resulting in a corner offset, that is, it cannot be accurately up, down, left, and right in a plane bend orientation, there will be a bend offset

Therefore, due to the large "bend angle offset" after the rivet riveted snake bone bends, it cannot reach the track bending on a plane of the designed bend, and the probe at the end of the endoscope lens is offset by the required amount. It is difficult to align the opening of the small turning hole. Therefore, sometimes the operating engineer inserts and inserts the corner after repeated operations, and often fails to align with the small hole inside the device. , after many operations until it is inserted into the corner hole and reaches the observed position, it takes a long time

Therefore, the "bend angle offset" generated after the "rivet snake bone device" is bent has caused the defects of long detection time and low work efficiency

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