Marrow nail used for patellae

Abstract

The invention provides a marrow nail for patellae. The marrow nail comprises a nail shank; the nail shank is provided with a first break-off groove and a second break-off groove; an intramedullary rodis between the first break-off groove and the second break-off groove; the end, near the first break-off groove, of the intramedullary rod is provided with a first threading hole; and the end, near the second break-off groove, of the intramedullary rod is provided with a second threading hole. The invention designs a special marrow nail for patella fracture; after a nail body passes through a patella, except the first threading hole and the second threading hole at two ends of the intramedullary rod, the remaining middle part stays in the patella, and the first break-off groove and the secondbreak-off groove are utilized to break off and separate parts respectively connected with the two ends of the intramedullary rod; the intramedullary rod fixes a fracture position by making multiple auxiliary steel wires thread through the first threading hole and the second threading hole, so that the fracture is stable and reliable to fix, and the technical problems that a slender rod connectedwith a top end of an intramedullary nail in the prior art is bent to form a ring to thread the auxiliary steel wires, and the ring formed by bending has poor closure, and has a gap, so that the auxiliary steel wires are prone to slip off are relieved.

Description

technical field [0001] The invention relates to the technical field of medical appliances, in particular to an intramedullary nail for patella. Background technique [0002] Bone marrow nail is a kind of medical needle-shaped instrument used to insert into the medullary cavity on both sides of the broken end in fracture repair surgery. Its main function is traction or fixation support. It is generally used for the fracture of long bones and does not need to penetrate too much auxiliary steel wire. Fix the fracture site, so usually only one threading hole is provided on the shank of the intramedullary nail to meet the requirements. [0003] Fractures at the patella are generally comminuted to a relatively high degree. Multiple auxiliary steel wires need to be used to wrap the patella in different ways when using intramedullary nails. The intramedullary nail has only one threading hole, which cannot meet the requirements. In this case, the tip of the intramedullary nail is usu...

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the intramedullary nail uses a thin rod connected to the tip to bend into a loop to pass around the auxiliary steel wire. The bent ring has poor closure and has a gap, and the auxiliary steel wire is easy to slip off.

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