A core-inserted expansion screw and method of use thereof

Abstract

The invention provides an inner core inserting type expansion screw. The inner core inserting type expansion screw comprises a screw body, wherein an expansion inner core is arranged in the screw body, a through side slit is arranged at the lower part, a pushing and locking nut is arranged at the top, and the lower end of the expansion inner core extends from the side slit of the screw body. The invention further provides a use method of the expansion screw. The expansion degrees of expansion arms can be controlled by controlling the pushing distance of the pushing and locking nut. When the expansion screw is used for bone fixation for symptoms of pathological bone density reduction and osteoporosis and fixation of soft tissue and bones, the fixation area can be increased, the range of a bone trabecular can be controlled, the fixation strength can be improved, and the screw retreating, breakage and fixation failure occurrence rate can be reduced or eliminated. Further, the expansion inner core, the pushing and locking nut and the screw body are arranged in a non-fixed manner, thereby being conveniently taken out of a body after fixation; the structure is simple, the practicability is high and the operation is easy.

Description

technical field [0001] The invention belongs to the technical field of medical devices and relates to the technical field of bone repair and reconstruction, in particular to an inner core-inserted expansion screw and a usage method thereof. Background technique [0002] In clinical treatment of fractures, osteotomy, soft tissue and bone fixation, or other bone fixation, the requirement for the fixation strength of the internal fixation is based on the principle of obtaining sufficient stability, and the bone density For bone quality with normal parameters, ordinary screws can achieve the required fixation strength and holding force. For the elderly with degenerative osteoporosis, or when they are required to bear early load, or have overweight, pathological osteoporosis, etc., the common cancellous bone screws or cortical bone screws currently used clinically cannot Obtain sufficient mechanical strength of fixation, but complications such as screw breakage, loosening, prola...

AI Technical Summary

Problems solved by technology

For the elderly with degenerative osteoporosis, or when they are required to bear early load, or have overweight, pathological osteoporosis, etc., the common cancellous bone screws or cortical bone screws currently used clinically cannot To obtain sufficient mechanical strength of fixation, complications such as screw breakage, loosening, prolapse or bone displacement, and fixation failure often occur

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