Broken nail extractor

Abstract

A broken nail extractor comprises a hollow trephine, a threaded needle and a connection rod. A plurality of end teeth are arranged at the ring end of the head portion of the hollow trephine, spiral teeth are arranged on the rear portions of the end teeth, trephine inner holes are arranged at the centers of the end teeth, and the outer rear portions of the end teeth are tapered, and drill type spiral grooves are arranged at the tapered rear end. Inner threads are arranged on the rear portion of the hollow trephine, the threaded needle is arranged in the hollow trephine, the front end of the threaded needle stretches out of the trephine inner holes, and the connection rod is arranged at the rear end of the threaded needle. The broken nail extractor has the advantages that an alpha tapered angle is arranged on the head portion, and no resistance exists when bones around a broken nail is drilled; the plurality of the end teeth are arranged on the head portion, so that the extractor is sharp during bone extracting; hollow trephines with different diameters are provided according to different sizes of broken nails; the rotation directions of the grooves on the head portion are leftward; and threads on the tail portion are left-hand threads, the screwing direction is in accordance with the drilling direction during matching usage with the threaded needle and the connection rod, and looseness of connection threads is prevented.

Description

technical field

[0001] The invention relates to the technical field of medical devices, in particular to a broken nail extractor for taking out broken nails after screws break during orthopedic internal fixation operations or after the operation. Background technique

[0002] At present, internal fixation with bone plate screws is a common method for treating fractures. However, due to the quality of the screws or other reasons, sometimes the screws may break during clinical use or after surgery. How to successfully remove the broken screws without causing bone damage? Excessive destruction is a difficult problem for orthopedic surgeons to solve.

[0003] For many years, most hospitals have used osteotome to remove the bone around the broken nail, and then use the nail remover to grab the broken nail and take it out. With the advancement of time and the advancement of technology, it has been clinically found that the bone is first taken out with an osteotome, and then the b...

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