Memory-alloy-wire sternum fixer with three pairs of encircling arms

Abstract

The invention discloses a memory-alloy-wire sternum fixer with three pairs of encircling arms. One memory alloy wire is used to make an integrated molding structure with three pairs of encircling arms, wherein two encircling arms in each pair are all bent inwards in an opposite direction to form an open circular structure; the three open circular structures are parallel to each other, and each encircling arm is formed by parallelly bending two memory alloy wires; two parallel memory alloy wires positioned on the top of each encircling arm are expanded to form a single arch-shaped arm girder; the middle section of the single arch-shaped arm girder positioned between two adjoining encircling arms is pressed inwards to constitute an arc-shaped pressing ring, and all pressing rings are positioned on one plane. By adopting one memory alloy wire to make the sternum fixer with three pairs of encircling arms and six pressing rings, the memory-alloy-wire sternum fixer is applicable to a patient who has a pretty big wound. Damage caused to vascularis nervus by the patient's sternum fixed by the memory-alloy-wire sternum fixer is small, and the memory-alloy-wire sternum fixer also has the advantages of having a small foreign body sensation, and being uneasy to detach, safe and reliable. After recovery of the patient, cold compress is only one thing needed during disassembly and the fixer can be extracted easily without any other auxiliary tools, so that the operation is simple and fast.

Description

technical field [0001] The invention belongs to medical equipment, and relates to a sternum fixer, in particular to a memory alloy wire sternum fixer with three pairs of embracing arms. Background technique [0002] In recent years, sternal fractures have been caused by traffic accidents, falls and other reasons. Sternal fractures are relatively serious chest injuries. Fractures cause the chest wall to lose support and soften, causing abnormal breathing and mediastinal oscillations, which seriously affect the patient's respiratory and circulatory functions and are life-threatening. Fixers such as steel wire binding, Kirschner wire fixation, steel plate fixation and synthetic resin fixation are generally used in thoracic surgery at present. During thoracic surgery, due to the need for patient treatment, it is sometimes necessary to incise the sternum along the midline, and then bind the sternum with stainless steel wire or fix it with Kirschner wires after the operation is co...

AI Technical Summary

Problems solved by technology

The sternum is a flat bone, which is easy to shift, and it is difficult to control the binding strength of the wire due to the tension of lung respiration

If the binding is too loose, the fixing effect will not be achieved. If the binding is too tight, the steel wire will easily break, and the longitudinal steel wire will easily tear the sternum. If the steel wire is used, the steel wire is easy to loosen, resulting in adverse consequences such as poor healing of the sternum and delayed healing.

After the sternum heals, the steel wire is not easy to remove, and may even damage vital organs under the sternum, leading to medical accidents

Although the fixation with steel plates is more reliable, it requires drilling, which is easy to damage the organs behind the sternum, and the steel plates in the body are prone to electrolytic reactions, requiring a second operation to remove them

Although synthetic resin is absorbable and does not require a second operation to remove the fixation, it needs to be inserted into the bone marrow cavity during fixation, which is prone to infection and the fixation effect is not reliable

The above-mentioned existing surgical operation is more difficult when it is fixed, and the operation time is longer. More importantly, it is difficult to remove after healing.

With the development of science and technology, memory alloy plates are used to make sternal bone plates. Although this type of bone plate has greatly improved the fixation strength and connection stability, because the plate is made by forging, rolling, and wire cutting, there may be internal Inhomogeneous tissue, defects in strength, plasticity, hardness, etc. This type of bone plate may have a risk of fracture after installation. Not only is there hidden danger when installed in the patient's body, but also time-consuming and labor-intensive to disassemble, and many tools are required for disassembly, especially cold compress during disassembly. After the bone plate, you need to use special pliers and a crowbar to pry open the jaws one by one. The disassembly process is cumbersome, time-consuming, and risky. Generally, medical personnel need to have certain operating experience to successfully disassemble the bone plate. In some critical cases, chest surgery is required. In an emergency situation, a little careless operation will bring harm to the patient, and in serious cases will directly endanger the life of the patient.

Especially when the wound is large, the model of the sternal bone plate installed is larger, the contact area with the patient is larger, and the disassembly is more cumbersome

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