Pressurized intramedullary expanding interlocking screw and manufacturing method thereof

Abstract

The invention discloses a pressurized intramedullary expanding interlocking screw. The pressurized intramedullary expanding interlocking screw comprises a main intramedullary screw, an inward-expanding screw, a pressurized set screw and an arc tail end screw plate. A hollow hole is formed in a main rod of the main intramedullary screw, the near end of the main intramedullary screw is provided with an axial inner hole connected with the pressurized set screw through threads, the far end of the main intramedullary screw is provided with a set of petal type wing-shaped sheets which can be driven by the inner supporting force to open outwards, and at least two tip blades are arranged on the outer side of each wing-shaped sheet; the inward-expanding screw is screwed down to stretch the wing-shaped sheets at the far end of the main intramedullary screw. The pressurized set screw can be screwed into the axial inner hole in the near end of the main intramedullary screw, and a screw cap is arranged at the tail of the pressurized set screw, and the whole length of the pressurized intramedullary expanding interlocking screw can be shortened and prolonged by screwing in and out the pressured set screw. The arc tail end screw plate is provided with an opening hole where the pressurized set screw can penetrate, and is abutted to an acted body through the screw cap at the tail of the screwed pressured sleeve screw. According to the pressurized intramedullary expanding interlocking screw, the mini-invasive surgical treatment can be achieved for an olecranal fracture and a fibula external ankle fracture, and the functions of elbow joints and ankle joints can be recovered early.

Description

technical field [0001] The invention relates to a medical device, in particular to a pressurized expansion locking nail in the bone marrow cavity for fractures of the olecranon of the ulna and the fracture of the lateral malleolus of the fibula. Background technique [0002] (1) Olecranon fracture [0003] Olecranon fracture is one of the common injuries of elbow joint. It is more common in adults and is mainly caused by indirect violence. Since the injury is an intra-articular fracture, an anatomical reduction is required during treatment, the articular surface is smooth, the fixation is firm, and early activities can be performed in order to restore good elbow function. The treatment methods for displaced olecranon fractures usually include closed manipulative reduction and surgical open reduction and internal fixation. [0004] At present, the treatment methods for olecranon fractures at home and abroad usually include: [0005] 1) Closed manipulative restoration, ext...

AI Technical Summary

Problems solved by technology

Disadvantages: Complications such as Kirschner wire withdrawal and wire breakage may occur

Disadvantages are: large skin incision, heavy soft tissue damage, high chance of infection

[0018] In addition, for the internal fixation of fractures in patients with advanced age, diabetes and osteoporosis, the current common surgical treatment has a greater risk, which makes many patients lose the opportunity for better treatment

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