Method for preparing an endoscope handle cord resistant to high temperature autoclaving

Abstract

This invention provides a method for manufacturing an endoscope handle cable that can withstand high-temperature and high-pressure sterilization. The method includes: providing a segmented topology metal conductor with alternating straight and spiral segments, and setting a stress-isolation transition zone at the connection points; simultaneously extruding a gradient composite insulation layer onto the surface of the metal conductor to obtain a composite cable body; providing a shape memory alloy sealing compensation component with a geometrically enlarged structure, which is used to convert material phase transition strain into macroscopic displacement; assembling the sealing compensation component and the composite cable body into an end housing, and then encapsulating the entire assembly using an elastic sealing material. This invention solves the stress concentration caused by curvature steps through conductor topology optimization, and combines the dynamic active compensation mechanism of gradient insulation and shape memory alloy, enabling the handle cable to withstand more than 600 sterilization cycles in a saturated steam environment of 134°C and 3 bar, maintaining excellent electrical performance and airtightness.

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