Metal spicule

Abstract

The invention discloses a metal spicule and relates to an instrument used in an orthopedic operation. A threaded part is arranged on the front portion of a cylindrical rod body of the metal spicule, and a planar clamping part is arranged on the outer circumference of the rear end of the rod body; the threaded part with the cylindrical outer circumference being the same as that of the rod body is arranged on the front portion of the rod body, the outer diameter of the root of each thread on the threaded part becomes larger gradually from front to back, and the height of each thread becomes smaller gradually from front to back; a hydroxylapatite coating is arranged on the outer circumference of the threaded part; radial blind holes which extend towards the central axis of the rod body are formed in the portions, between the threads on the upper portion of the threaded part, of the spiral circumferential surfaces of the roots; an antibiotics coating is arranged on the outer circumference of the middle of the rod body. The metal spicule is high in holding force, capable of preventing inflammation of the skin of a human body, and suitable for osteoporotic patients or the metaphysis.

Description

technical field [0001] The present invention relates to a device for orthopedic surgery. Background technique [0002] The structural features of the existing metal bone pins for orthopedic surgery are: the front part of the cylindrical rod body on the metal bone pin is connected with a conical outer peripheral threaded part that gradually increases from front to back, so as to be screwed into the patient's bone; The outer periphery of the rear end is provided with a flat clamping part, so that a socket wrench can be used to rotate the bone needle to screw in or withdraw the bone needle. A major problem that plagues orthopedic surgery is the loosening of bone pins after implantation, which eventually leads to the failure of internal fixation. Because the thread part adopts a single helical tooth design with a constant thread height, and the outer circumference of the thread part is tapered, the holding force is insufficient when used in patients with osteoporosis or metaphy...

AI Technical Summary

Problems solved by technology

A major problem that plagues orthopedic surgery is the loosening of bone needles after they are implanted into the human body, which eventually leads to the failure of internal fixation

Since the thread part adopts a single helical tooth design with constant thread height, the outer circumference of the thread part is tapered, and the holding force is insufficient when used for patients with osteoporosis or the metaphysis, and it is easy to loosen after operation

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