Positioning marker made of degradable metal and method for preparing positioning marker

Abstract

The invention relates to a positioning marker made of degradable metal and a method for preparing the positioning marker. The positioning marker is made of pure magnesium or magnesium alloy. The totalcontent of impurities in the pure magnesium and the magnesium alloy is lower than 0.01% by mass fraction. At least three magnesium wires are woven to obtain the positioning marker. The positioning marker is provided with a wound end and a positioning end. The positioning end is connected to the wound end and is of a claw-shaped or anchor-shaped structure. The positioning marker and the method have the advantages that the tensile strength of the positioning marker is higher than 200 megapascal, the percentage elongation after fracture is higher than 10%, and the in-vivo degradation rate is lower than 0.5 mm/year; the positioning marker can be developed in ultrasonic and X rays, the locations of the positioning marker can be detected by the aid of ultrasonic or molybdenum target X rays in operative procedures and postoperative treatment procedures, and the positioning marker can be gradually degraded along with postoperative treatment, and can be absorbed by surrounding tissues or discharged from human bodies by means of metabolism without being taken out by means of second operation.

Description

technical field [0001] The invention relates to a positioning marker related to preoperative biopsy, intraoperative resection and postoperative treatment of breast tissue during the treatment of breast tumors, in particular to a positioning marker made of degradable metal and a preparation method thereof. Background technique [0002] Breast minimal lesions are small and clinically inaccessible. Precise positioning is required for marking after biopsy sampling, during surgery, and postoperative treatment to avoid surgical resection of too much normal tissue while ensuring the accuracy of diagnosis and treatment. [0003] The currently used positioning marker material is generally titanium, titanium alloy or stainless steel. For breast tumors that require surgical resection, the markers will be removed along with the lesion and part of the normal tissue. For patients who do not need surgery after postoperative treatment or biopsy, the markers will remain in the body for a lo...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing positioning markers are made of non-degradable metal or alloy materials, which may bring foreign body sensation to patients, and may also move to other parts, and even require a second operation to remove the markers, bringing potential risks and risks to patients. Hidden dangers, the main purpose of the present invention is to provide a positioning marker made of degradable metal and its preparation method. The posi

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