High-strength absorbable bone screw for internal fracture fixation

Abstract

The invention discloses a high-strength absorbable bone screw for internal fracture fixation. The bone screw is prepared from a degradable oriented polylactic acid sectional material, wherein the raw material of the oriented polylactic acid sectional material is L-polylactide having a specific rotation of negative155-negative 160 degrees; the sectional material is prepared from L-polylactide sequentially through blank preparing, oriented reinforcing and quenching, the blank preparing method is injection molding, the oriented reinforcing method is forging and pressing or extruding; and the sectional material is manufactured into the bone screw through a turning method, a carving method or a direct molding method. The bone screw has high strength, small attenuation rate of mechanical strength, ensures mechanical support in a bone healing stage and sufficient heating time for injured bones, has good biocompatibility, can be degraded and absorbed, can be used for reducing osteoporosis, and has a remarkable effect on fixing cancellous bone fracture. Under a special condition, the size of the bone screw can be adjusted according to the ankle osteotomy, ankle fracture degree and the growth plate characteristics of ulna.

Description

technical field [0001] The invention belongs to the field of medical and surgical instruments, and in particular relates to a high-strength absorbable fracture internal fixation bone screw. Background technique [0002] Polylactic acid is a fully degradable absorbent material with good biocompatibility. It can be degraded into lactic acid in the body and enter the tricarboxylic acid cycle. The final product is CO 2 and H 2 O, non-toxic and harmless to the human body, is one of the most widely used synthetic degradable polymers in medicine. It is widely used in the medical field as drug sustained-release materials, internal implant materials, surgical sutures, orthopedic internal fixation materials, and tissue engineering materials. [0003] Broken bones of the human or animal body can be combined by internal fixation devices. Screw internal fixation technology has a history of 100 years in the treatment of fractures, from ordinary screws to screws with different pitches an...

AI Technical Summary

Problems solved by technology

Existing bone screws are mainly made of polylactic acid materials composed of D-lactic acid and trimethylene carbonate, however, bone screws made of polylactic acid materials composed of D-lactic acid or trimethylene carbonate Due to the racemic form D, D-polylactic acid (PDLA) synthesized by D-polylactic acid has an amorphous structure, its mechanical properties are poor, and its degradation time is short, so it cannot maintain sufficient time and strength in the human body. , so that the patient's bone injury healing time is not sufficient, leaving hidden dangers

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