Anti-rotation hollow screw

Abstract

The invention discloses an anti-rotation hollow screw, which comprises a hollow screw body. A plurality of first through holes is arranged on the outer side wall of the hollow screw body, an inner core is inserted into the hollow screw body, second through holes are respectively disposed on each of the inner core sidewalls corresponding to each of the first through holes, guide rods are disposed on the inner wall of the inner core, and one side screw is respectively mounted on each of the guide rods, and the side screw includes a turbine end and a self-drilling self-tapping screw head. a guiding hole is arranged in a middle portion of the turbine end, a guiding rod is inserted into the guiding hole, a plurality of turbine teeth are arranged outside the turbine end, a threaded tooth havinga helical structure is arranged on a worm corresponding to the thread tooth groove position, an adjusting block is arranged at one end of the worm near a head of the hollow screw body; a lower bearingand an upper bearing are respectively embedded in a lower bearing groove and an upper bearing groove, a sealing cover is embedded in the upper bearing groove above the upper bearing, and limiting blocks inserted into a clamping slot are symmetrically disposed on both sides of the outer wall of the inner core; the adjusting block is connected with a wrench, and the head of the hollow screw body isprovided with a limit cover.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to an anti-rotation hollow screw. Background technique [0002] The hollow nail body is an internal fixation device used for pressurization and fixation of fracture ends in fracture surgery. It is used for internal fixation of limb metaphysis, pelvic fractures, and irregular fractures. Hollow nails with different diameters are used for different types of fractures. 3.0mm is usually used for scaphoid fractures and small fracture avulsions, 4.0mm is usually used for epiphyseal fractures, 6.5mm and 7.3mm are usually used for proximal femoral fractures and femoral condyle fractures. When using the fracture, the fracture is first closed and reduced, the positioning guide pin is placed percutaneously, and the position of the guide pin is observed under the C wall. Guide pin, use a hollow drill to open, and a hollow screwdriver to screw into the tension hollow nail body. [0003] Most ...

AI Technical Summary

Problems solved by technology

The existing hollow nail body has no thread in the middle and tail of the nail. When fixing, only the threaded end can be fixed. The fixation effect of the unthreaded end is poor. The hollow nail is fixed by tension and pressure. Supply, it is possible to make the fracture pseudounion in a short period of time, and the surrounding bone is not healed and absorbed. After a period of time, the bone around the fracture line resorbs and heals, resulting in bone loss, while the length of the hollow nail remains unchanged, resulting in hollow nails. come out

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