Beta titanium alloy falling-off-proof nail for sagittal condylar fracture and using method of beta titanium alloy falling-off-proof nail

Abstract

The invention discloses a beta titanium alloy falling-off-proof nail for sagittal condylar fracture and a using method of the beta titanium alloy falling-off-proof nail. The falling-off-proof nail comprises a shell, a screw and two barbs, wherein the shell has a circular truncated cone shaped structure with the hollow inside; two opposite first grooves are formed in the top end of the shell; two second grooves are respectively formed in the inner side of two edges which are perpendicular to a connecting line of the two first grooves in the top end of the shell; a cylindrical transverse rod is arranged in each second groove; the shape and the size of the side wall of the screw are the same as those of the inner wall of the shell; and a third groove is formed in the tail end of the screw. The beta titanium alloy falling-off-proof nail for sagittal condylar fracture does not contain aluminum or vanadium harmful to human bodies, is good in biocompatibility, and does not need to be taken out by secondary surgery; wound can be reduced obviously; meanwhile growth of osteocytes can be induced; the area of a part, which is in contact with a lower jawbone, of the beta titanium alloy falling-off-proof nail is large, and the retention effect is good. The beta titanium alloy falling-off-proof nail for sagittal condylar fracture is simple in structure, sophisticated in manufacturing technology, low in cost and low in price. Tests prove that the effect is good, and the market prospect is good.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a β-titanium alloy detachment-preventing nail for condylar sagittal fractures and an application method thereof. Background technique [0002] Saggital fracture of mandibular condyle (SFMC) is a relatively rare but special intracapsular fracture. With the development of imaging technology, the detection rate of saggital condyle fracture has increased significantly. Surgical open reduction and fixation (ORIF) can reduce the occurrence of temporomandibular joint disorder and joint ankylosis, but its narrow space and special anatomical structure of the condyle (rich in cancellous bone, only a thin layer of compact bone on the surface) increase Difficulty of operation, conventional surgical methods are often difficult to achieve the ideal fixation effect, so it is necessary to develop a more reasonable fixation device while improving the surgical method. [0003] At present, a lot of ...

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Problems solved by technology

In the 2nd National Symposium on Condylar Fractures and Ankylosis in 2015, experts recommended two 16mm long screws for penetrating fixation to avoid rotational displacement of fracture fragments or screw loosening, but two screws increased secondary fractures risk, or the fracture fragment is too small to accommodate two screws

Lag screws and absorbable screws have been studied more. Clinically, lateral lag screw technology is used to perform ORIF for sagittal condylar fractures. The fixation effect is better, but the fracture fragments must be large enough, otherwise it is difficult to achieve the ideal retention force. Even the exposed screw damages the articular surface and peripheral blood vessels and nerves, leading to joint ankylosis or osteomyelitis, and the operation is difficult, requiring high accuracy in the direction of screw insertion

Absorbable screws mainly adopt 16-18mm bicortical screw technology, with modified high-strength polylactic acid (PLGA) as the main material, which has good biocompatibility and is eventually degraded into carbon dioxide and water to be excreted from the body without secondary surgery. However, its strength is far lower than that of titanium alloy screws, which is not enough to withstand strong chewing pressure, and PLGA will produce glycolic acid and lactic acid after degradation, which will inevitably cause acidic substances to accumulate. In addition, the high-strength absorbable screws currently on the domestic market mainly rely on imports , such as Finnish Biofix Biofix, Japanese Taxiron Fixsorb, etc., are expensive, which limits the wide application of absorbable screws in clinical practice

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