Palm finger intramedullary needle

Abstract

A palm-finger intramedullary needle comprises a needle body, an inner cavity is formed in the position, close to the tip, of the needle body, at least one pair of oppositely-arranged elastic locking barbs is arranged in the inner cavity, one ends of the elastic locking barbs are fixedly connected to the needle body, and the other ends of the elastic locking barbs face the tail end of the needle body and warp in an arc shape along the radial outer side. An opening groove allowing the warped end of the elastic locking barb to extend out is formed in the inner cavity wall of the needle body, a control sleeve is arranged in the inner cavity in a sliding mode and comprises a middle body, and a receding groove correspondingly matched with the opening groove to allow the warped end of the elasticlocking barb to extend out of the opening groove is formed in the middle body. The two axial ends of the middle body are provided with a retaining ring and a folding ring respectively, the warping ends of the elastic locking barbs are folded in the open grooves, the folding ring is located at the end, close to the front end of the needle body, of the control sleeve, the control sleeve is connected with a driving device for driving the control sleeve to slide, and the operating end of the driving device is arranged at the tail end of the needle body. The intramedullary needle is provided withan internal locking structure, reliable in fixation and convenient to disassemble.

Description

technical field [0001] The invention relates to a surgical instrument, specifically a metacarpophalangeal intramedullary needle. Background technique [0002] Metacarpal fractures can generally be divided into four categories: metacarpal head fractures, metacarpal neck fractures, metacarpal shaft fractures, and metacarpal base fractures. Among them, metacarpal neck and metacarpal shaft fractures are more common, and the incidence of fractures is more common in men than in women. Fracture displacement is smaller , External fixation is feasible, generally there are many fixation methods, and the fixation techniques are different, including traction fixation, plaster cast external fixation, small splint fixation, and intramedullary nailing. The above-mentioned surgical treatment methods have their own advantages and disadvantages, but the general development direction of trauma treatment is [0003] Small trauma, good prognosis, etc.; therefore, intramedullary nailing is curre...

AI Technical Summary

Problems solved by technology

The metacarpophalangeal intramedullary nails currently used in clinical practice are in the shape of bare rods, which have the problem of low holding force on the fracture end, and the slippage of the intramedullary nail leads to unreliable fixation at the fracture site.

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