Locking bone screw with expansionstructure

Abstract

The invention discloses a locking bone screw with an expansion structure, which belongs to the technical field of medical devices. The locking bone screw with the expansion structure is characterized by comprising an expansion screw rod and a top screw matched with the expansion screw rod, wherein internal threads are formed in a blind hole or a through hole of the expansion screw rod; external threads which are engaged with the internal threads in the blind hole or the through hole of the expansion screw rod are formed in the top screw; more than one expansion groove is formed in the head part of the expansion screw rod; a groove, a polygonal blind hole or a polygonal bump through which the top screw can be screwed into the blind hole or the through hole of the expansion screw rod is formed in the tail part of the top screw; external threads through which the expansion screw rod can be screwed into a broken bone to form a taper are formed in the tail part of the expansion screw rod; a groove through which the external threads with the taper can be screwed into the broken bone is formed in the end surface of the tail part of the expansion screw rod. According to the locking bone screw with the expansion structure, the friction force between the bone screw and a cancellous bone can be increased, and the pulling resistance of the bone is increased, so that the screw is firmly connected with a cortical bone or the cancellous bone; the bone screw is easy and convenient to operate, and is easily screwed and removed during a surgery.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a locking bone screw with an expansion structure. Background technique [0002] The skeleton consists of cortical bone, cancellous bone, and bone marrow from the outside to the inside. Characteristics of cortical bone: relatively hard and relatively thick; characteristics of cancellous bone: relatively loose and relatively thick. Fracture is the most common clinical case, and the treatment method adopts the treatment method of common internal fixation, that is, usually adopts bone screw and locking plate to fix the broken bone back together. And the existing bone screws are all connected between cortical bone and cancellous bone by thread on the screw, such as publication number: 102458285A "bone screw"; publication number: 103126761A "bone screw"; announcement number: "bone screw" etc. The technical solution described. However, the connection between the t...

AI Technical Summary

Problems solved by technology

However, the connection between the thread on the screw and the cortical bone and cancellous bone has the following disadvantages: First, due to the characteristics of bone composition, once the thread on the screw fails to connect with the cortical bone, it is easy to cause the screw to loosen or even break away from the steel plate, resulting in nonunion or fracture. Delayed union or malunion or the consequences of secondary surgery, which seriously affects the patient's postoperative recovery and increases the suffering of the patient

The second is that no matter how long the thread of the existing bone screw is, the doctor can only screw it in manually, which is not only labor-intensive and time-consuming, but also easily causes damage to cortical bone and cancellous bone during screw screwing.

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