Medical internal fracture fixation needle and medical fracture fixation tool

Abstract

The invention discloses a medical internal fracture fixation needle and a medical fracture fixation tool. The medical internal fracture fixation needle is made of biodegradable magnesium or magnesiumalloy materials, and comprises a needle head, a needle body and a needle tail, wherein the needle head is conical so that an internal fixation needle can be inserted into a bone hole; the needle bodyis cylindrical, and a clamping structure is arranged on the needle body, and is used for achieving locking of the needle body after the internal fixation needle is inserted into the bone hole; multiple tail vane structures arranged at intervals are arranged on the surface of the needle tail, the ends, away from the needle tail, of the tail vane structures are pointed, so that the tail vane structures are inserted into the bone hole to achieve the anchoring effect, and a sliding groove for achieving the guiding effect is formed between every two tail vane structures. By means of the medical internal fracture fixation needle and the medical fracture fixation tool, the discomfort of a patient in the application process is reduced while a fixation operation can be conveniently carried out on the patient, and a second operation is avoided; as a degradation product of magnesium and magnesium alloy is alkalescency, stem cells can be better differentiated into osteoblast, generation of new bones is facilitated, and fracture healing is promoted.

Description

technical field [0001] The invention relates to the technical field of orthopedic implantable medical devices, in particular to a medical fracture internal fixation needle and a medical fracture fixation tool. Background technique [0002] Fixing pin is a kind of medical device commonly used in orthopedic surgery, mainly used for fracture internal fixation. At present, the most widely used fixing needles clinically are Kirschner wires and Steiner wires, followed by absorbable needles made of polymer polylactic acid materials. [0003] Kirschner wires have become the most commonly used and most widely used internal fixation devices in trauma orthopedics because of their ease of use. The Kirschner wire is made of thinner stainless steel or titanium alloy material, and its structure is relatively simple, only a straight needle. Usually the diameter is less than 3mm and easy to bend. It is inserted into the bone marrow cavity at the fracture site when used. After the operati...

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Problems solved by technology

The temperature is higher during operation, which has a greater impact on bone healing

[0004] In addition, because the Kirschner wire and the Steiner wire are all made of traditional inert metals (stainless steel, titanium alloy, etc.), the strength value of these metals is about 1000 MPa. Although the ultra-high strength brings convenience in the use process, but Clinical studies have shown that for the fracture healing of the human body, this ultra-high strength is partially redundant, too high, and exceeds the functional requirements of the implant itself

On the contrary, it will have adverse effects, such as the common clinical "stress shielding" effect, which is not conducive to fracture healing and the strength of new bone

[0005] The clinical fixation needles made of absorbable polylactic acid polymer materials, but because of the low strength of polylactic acid polymer materials, usually only about 80-90MPa, the fixation needles made of them have low strength and poor mechanical properties. , easy to break, leading to operation failure

Moreover, the degradation product of polylactic acid polymer materials is lactic acid, which is acidic, which can easily lead to aseptic inflammation and form a hole in the bone, which is difficult to heal for a long time

These defects have seriously limited the clinical trial effect and application range of polylactic acid polymer material fixation pins, and the market usage is very small.

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