An extramedullary combined bevel gear bone extension device

Abstract

The invention provides a novel bone lengthening device adopting intramedullary and extramedullary combination and adopting bevel gears, and relates to a medical apparatus for the orthopedics department. Two guide rods are fixed between a fixed bone connector I and a gear box, a movable bone connector slides on the two guide rods, a lead screw is screwed to an intramedullary thread sleeve, the connecting rod of the lead screw rotatably penetrates through an intramedullary shaft base and is fixedly provided with a driven gear, a lower transmission gear in the gear box is meshed with the driven gear, a bevel gear drive box is fixed on a fixed bone connector II, a transmission shaft is rotatably arranged between the bevel gear drive box and the gear box, an upper transmission gear is fixed atone end, positioned in the gear box, of the transmission shaft and is meshed with the lower transmission gear, a horizontal bevel gear is fixed at one end, positioned in the bevel gear drive box, of the transmission shaft, the horizontal bevel gear is meshed with a vertical bevel gear, a shaft barrel fixedly communicates with the upper end of the bevel gear drive box, a driving shaft is rotatablyarranged in the shaft barrel, the lower end of the driving shaft is fixedly connected with the vertical bevel gear, and a handholding rotating handle is fixed at the upper end of the driving shaft. The traction lengthening for the skeleton can be carried out at any time, and the treatment time is shortened.

Description

technical field [0001] The invention relates to an orthopedic medical device, in particular to a bone extension device combining extramedullary and extramedullary bevel gears. Background technique [0002] Bone lengthening is currently an effective method to treat limb shortening deformity and restore or improve limb function. Among them, callus extension of metaphysis of long tubular bone is a common osteotomy extension method with large extension length, fast bone healing, less injury, relatively few complications, and simple operation. It means that the periosteum is reserved behind the metaphyseal bone, and the mesenchymal cells in the periosteum with strong osteogenic ability will heal the bone through the formation of callus. At this time, a slow and continuous traction force is applied through the bone extension device, which can make the The callus formed at the osteotomy is slowly extended to achieve the purpose of bone lengthening. [0003] The current bone exten...

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