An anti-rotation orthopedic internal fixator

Abstract

The invention discloses an anti-rotation orthopedic internal fixer, which comprises an outer sleeve, a positioning assembly, an operating assembly for controlling the movement of the positioning assembly, and a return spring; the operating assembly includes a proximal push rod and a distal slide rod; the proximal push rod is set It is inside the outer casing and is slidingly connected with the outer casing; the distal sliding rod is arranged inside the outer casing, and is located on the inner side of the proximal push rod, and the distal sliding rod is slidingly connected with the outer casing; the positioning components are respectively arranged on the two sides of the distal sliding rod One end is detachably connected with the far-end slide rod; one end of the return spring is integrally connected with the nozzle end of the far-end slide rod away from the threaded pipe, and the other end is integrally connected with the inner bottom of the threaded pipe. This design has anti-rotation and avoids trauma caused by multiple internal fixation objects. At the same time, it can well protect the blood supply of the fracture end, avoid destroying the blood supply of the fracture end and the non-fracture site, and avoid avascular necrosis in some parts. It is very important for avulsion fractures, diaphysis fractures, and femoral neck fractures.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an anti-rotation orthopedic internal fixator. Background technique [0002] At present, avulsion fractures, diaphysis fractures, and femoral neck fractures often occur clinically. For avulsion fractures, screws or Kirschner wires are often used for clinical fixation. If a single Kirschner wire has no anti-rotation ability, it is prone to rotational displacement of the fracture end after operation. If multiple Kirschner wires will cause more wounds than a single one, the anti-rotation ability of two Kirschner wires is poor. According to mathematical theory, because three points fix a plane, three Kirschner wires can be fixed stably, but the wound is obviously weaker. The single root is large, and there may be a risk of destroying blood supply; when the existing products are fixed in the bone marrow, there are many incisions, and the locking nails at both ends ...

AI Technical Summary

Problems solved by technology

[0002] At present, avulsion fractures, diaphysis fractures, and femoral neck fractures often occur clinically. For avulsion fractures, screws or Kirschner wires are often used for clinical fixation. If a single Kirschner wire has no anti-rotation ability, it is prone to rotational displacement of the fracture end after surgery

If multiple Kirschner wires will cause more wounds than a single one, the anti-rotation ability of two Kirschner wires is poor. According to mathematical theory, because three points fix a plane, three Kirschner wires can be fixed stably, but the wound is obviously weaker. The single root is large, and there may be a risk of destroying blood supply; when the existing products are fixed in the bone marrow, there are many incisions, and the locking nails at both ends cause new soft tissue and bone trauma; when the existing products are used to fix femoral neck fractures, The traditional three hollow nails are more traumatic than a single internal fixation, and destroy the blood supply of the femoral head, which is likely to cause femoral head necrosis

In recent years, a single internal fixation has poor anti-rotation ability, which may easily cause the rotation and displacement of the fracture end, resulting in nonunion or severe malunion

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