Special processing method of nickel-titanium alloy driving structure for vascular aortic catheter

Abstract

The invention discloses a nickel-titanium alloy driving structure non-traditional machining method for a blood vessel active catheter. The method comprises the steps that a three-dimensional structural model is built according to shape and size design requirements of a driving structure, and a numerical control machining code for a three-dimensional scanning track is generated; according to the numerical control machining code, a fine electrosparking device with a three-axis numerical control function is utilized for machining the designed three-dimensional structure on a nickel-titanium alloy tube by the adoption of a fine electrosparking servo scanning machining procedure with two-axis linkage and one axis servo control movement; and a supersonic vibration aided acid radical electrolyte electrochemical polishing method is adopted for removing a surface remelting layer of the three-dimensional structure, and the nickel-titanium alloy active catheter is obtained. The nickel-titanium alloy driving structure non-traditional machining method has the following advantages that the tubular complex micro three-dimensional driving structure can be machined on a nickel-titanium alloy difficult-to-machine material, the problem that machining depth, complexity and machining precision based on a photoetching technology at present are limited can be solved, and nickel-titanium alloy driving structure machining and forming precision of the blood vessel active catheter can be improved.

Description

technical field [0001] The invention relates to the technical field of micro special processing, in particular to a special processing method of a nickel-titanium alloy driving structure used for an active catheter of a blood vessel. Background technique [0002] Vascular-interventional minimally invasive surgery is a medical technology that uses tiny catheters and guide wires to reach distant lesion sites in the body through the lumen of blood vessels, and implements corresponding minimally invasive diagnosis or treatment. The traditional catheter intubation process relies on the operator's manual experience, and the complex environment inside the blood vessel makes it difficult to control the intubation. In order to overcome these shortcomings, a tiny interventional catheter robot is integrated at the front end of the interventional device to realize a millimeter-scale micro-active catheter that can actively deform with the vascular environment, which can make intubation a...

AI Technical Summary

Problems solved by technology

Although this process can directly process the overall structure, it is difficult to guarantee the processing accuracy of each part of the "S-shaped" microstructure due to the different exposure distances when using a flat mask plate to lithify the circular tube microstructure. Consistency, which affects the precision of drive control

[0007] In short, the above two processes based on the principle of photolithography cannot fundamentally solve the processing problem of complex and tiny three-dimensional structures.

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