A low-temperature phase-change memory alloy tissue stapler

Abstract

The invention discloses a tissue anastomat made by low-temperature phase-change memory alloy. The tissue anastomat comprises a suture line and a non-damage medical suture line fixedly connected with one end or two ends of the suture line. The suture line is a titanium-nickel alloy wire which has a linear memory shape in the range from 18 to 26 DEG C. The tissue anastomat made by low-temperature phase-change memory alloy has following beneficial effects: with a product, the suture line is at the conventional room temperature ranging from 18 to 26 DEG C in an operating room; after the package of the product is opened, the suture line naturally restores in the linear memory state; before stitching, the suture line is shaped under effect of external force; after stitched into a human body, the suture line again restores in the linear memory state; and purposes of conducting an intradermal suture operation smoothly, improving saturation precision of the operation and decreasing the duration for saturation of operation are fulfilled.

Description

technical field [0001] The invention relates to a medical tissue stapler, in particular to a tissue stapler using a titanium-nickel memory alloy wire as a base material. Background technique [0002] At present, a memory alloy intradermal tissue stapler commonly used clinically in hospitals includes a medical suture made of titanium-nickel or titanium-nickel-silver memory alloy. The memory shape is a straight line, and it is connected to one or both ends of the suture. It is composed of non-damaging medical suture needles of different specifications and shapes made of stainless steel. And set the shape memory of the memory alloy suture wire to be linear, and the phase transition temperature is between 27 and 33°C. The intradermal suture method is used for suture. When the suture wire enters the human body, the linear memory state is restored, and the recovery process produces mechanical damage. The tension makes the surgical incisions fit together naturally, thus meeting th...

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Problems solved by technology

This connection method has problems that are difficult or impossible to realize in actual process production

First of all, in the actual production process of titanium-nickel memory alloy wire, the required small-diameter wire is formed from a large-diameter wire after repeated stretching (the commonly used wire diameter for intradermal tissue suture is 0.070mm-0.299mm, that is, USP6-0 to USP2-0 / T), the diameter is uniform and the surface of the wire is flat, so it is impossible to form the protruding end at one time during the wire drawing process

In addition, due to the extremely small diameter of the wire, after the wire is stretched, it is almost impossible to form a firm protruding end through stamping, hot-melt deformation and other post-processing methods without affecting the tensile strength of the wire. possible or the process is extremely complex

At the same time, as recorded in the patent, it is difficult or impossible to realize the connection by welding after the middle section is sunken.

Since the material of the suture thread is titanium-nickel, and the material of the suture needle is stainless steel, this method not only has the risk of welding material falling off, but also puts forward higher technical requirements for the welding material and welding tools used; The gap between the inner walls of the blind hole is usually between 0.03 and 0.08mm. Normally, a high-power magnifying glass is required for observation. The welding material is difficult to melt into the tiny gap due to surface tension factors.

Moreover, any hot-melt method may denature and fuse the suture wire at the connection part, or form irregular solder joints on the edge of the blind hole entrance, which will increase the puncture resistance and affect the suture effect

[0004] In addition, the memory alloy intradermal tissue stapler used clinically in the hospital mostly uses non-invasive medical suture needles that are semicircular triangular needles (1 / 2 arc triangular needles), and the needle arc is too large, which is not suitable for intradermal tissue suturing; At the same time, although triangular needles are good for suturing tough tissues (such as abdomen and back), when using triangular needles to suture the eyes and face, it is easy to cause secondary damage such as contusion and cracking of skin tissue, and it is easy to form scars or affect wounds. healing time

Therefore, connecting the semicircular triangular needle has certain limitations in clinical use

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