Surface roughening method of thin-wall metal shell implanted into human body

Abstract

The invention discloses a surface roughening method of a thin-wall metal shell implanted into a human body, and belongs to the technical field of medical instruments. The method comprises the following steps that (1), punch forming is carried out to obtain a metal shell, the surface of the metal shell is washed, and oil stains and impurities on the surface are removed; (2), the metal shell is fixed to a machining table, the to-be-roughened metal surface is set as a machining area, laser technological parameters are adjusted, the to-be-roughened surface is focused, a laser is started to scan the to-be-roughened metal surface, a roughening effect is generated on the metal surface, and natural cooling is conducted; (3), the metal surface subjected to laser treatment is scrubbed with citric acid, and oxide particles generated in the laser treatment process are removed; and (4), the metal surface is washed with water, the residual citric acid is removed, and the metal surface is naturally aired. By the utilization of the method, personal danger to operators in the surface treatment process can be avoided, unexpected foreign substance residues are avoided, the structural strength of parts is not changed, and the biocompatibility and the structural reliability of materials can be ensured.

Description

technical field [0001] The invention belongs to the technical field of medical devices, in particular to a method for roughening the surface of a thin-walled metal shell implanted into a human body. Background technique [0002] An implantable cardiac pacemaker is an electronic therapy device that is implanted in the patient's body for a long time. The pulse generator sends out electric pulses powered by batteries, and through the conduction of wire electrodes, it stimulates the myocardium in contact with the electrodes, making the heart Excitement and contraction, so as to achieve the purpose of treating cardiac dysfunction caused by certain arrhythmias. As a long-term implant, the pulse generator needs to work in the human tissue fluid environment for 8-20 years, and its long-term biocompatibility, long-term structural reliability and long-term electrical continuity are crucial. [0003] The pulse generator of an implantable cardiac pacemaker generally consists of two par...

AI Technical Summary

Problems solved by technology

[0010]At the same time, thin-walled parts with a thickness of 0.1-0.5mm have poor rigidity, and sandblasting on them will easily warp and deform the parts, resulting in residual stress. Affects the assembly fit and weld seal of the shell

[0011]If the part only needs to be roughened on the local surface, the above two methods need to use additional means to protect the unprocessed surface, which complicates the entire machining process , and strong acid or high-speed sand easily invades the interface to make the boundary blurred, and the product consistency is not easy to guarantee

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