CN-122005045-A - Proximal femur inner side reduction spreader for preventing wedge effect of fracture between trochanters of femur

CN122005045ACN 122005045 ACN122005045 ACN 122005045ACN-122005045-A

Abstract

A femoral proximal end inner side reduction spreader for preventing a femoral intertrochanteric fracture wedge effect comprises a central upright post and a push rod, wherein a cylindrical inserting rod is formed at the lower part of the central upright post and used for being inserted and fixed in a reserved fixing hole of an operating table, a mounting hole is formed transversely and penetratingly in the upper part of the central upright post, the mounting hole extends along the upper and lower directions of the upper part of the central upright post, a jacking block is mounted in the mounting hole and is statically kept at a preset height position in the mounting hole through friction force between the jacking block and the left side surface and the right side surface of the mounting hole, a threaded hole is formed in the front and rear directions of the jacking block in a penetrating mode, a push head assembly is rotatably mounted at the front end of the push rod, a wheel-shaped handle is fixedly mounted at the rear end of the push rod, external threads are formed at the middle part of the push rod, the middle part of the push rod is mounted in the threaded hole of the jacking block, and extends to the front of the jacking block and is used for pressurizing the proximal end inner side of a thigh of a subject, and corresponds to a femoral lesser trochanter or an inner cortical projection area.

Inventors

ZHANG HAIJUN
LIU TAO
SHI ZHONGJU
SONG XIUYUN
WANG FEI
GAO XU
LI XINXIN

Assignees

天津医科大学总医院

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (5)

1. A proximal femur inner side reduction spreader for preventing fracture wedge effect between femur trochanters comprises a central upright post and a mandril; The lower part of the central upright post is provided with a cylindrical inserting rod which is used for being inserted and fixed in a reserved fixing hole of an operation table, so that the central upright post is positioned at the crotch position of a subject, the upper part of the central upright post is transversely and penetratingly provided with a mounting hole, the left side surface and the right side surface of the mounting hole are respectively inclined outwards, so that the mounting hole is formed into an opening with a wide front part and a narrow rear part in an eight shape, the mounting hole extends along the upper and lower directions of the upper part of the central upright post, the mounting hole is internally provided with a jacking block, the left side surface of the jacking block is pressed on the left side surface of the mounting hole, the right side surface of the jacking block is pressed on the right side surface of the mounting hole, and the jacking block is statically kept at a preset height position in the mounting hole by friction force between the jacking block and the left side surface and the right side surface of the mounting hole; the front end of the ejector rod can be rotatably provided with an ejector head assembly, the rear end of the ejector rod is fixedly provided with a wheel-shaped handle, and the middle part of the ejector rod is provided with external threads; The middle part of the ejector rod is arranged in a threaded hole of the jacking block, the ejector head component extends to the front of the jacking block and is used for pressurizing the inner side of the proximal end of the thigh of a subject, the corresponding femur lesser trochanter or the inner cortical projection area is achieved, the pressure applied to the subject by the ejector head component is adjusted by adjusting the length of the ejector rod extending from the jacking block so as to prevent the wedge effect of fracture between femur trochanters, and the wheel-shaped handle is positioned at the rear of the jacking block and is used for adjusting the length of the ejector rod extending from the jacking block.
2. The medial femoral proximal reduction distractor for preventing the wedge effect of intertrochanteric fractures according to claim 1, wherein: The top head assembly comprises a bottom plate and an elastic cushion block, the elastic cushion block is fixed on the front side of the bottom plate, an annular clamping ring is integrally formed at the center position of the rear side of the bottom plate, an annular protruding edge is integrally formed on the outer peripheral surface of the front end of the top rod, and the protruding edge of the top rod can be rotatably arranged in the clamping ring of the bottom plate.
3. The medial femoral proximal reduction distractor for preventing the wedge effect of intertrochanteric fractures according to claim 2, wherein: The front side of the elastic cushion block is formed into an arc-shaped concave surface.
4. The medial femoral proximal reduction distractor for preventing the wedge effect of intertrochanteric fractures according to claim 2, wherein: The central upright post, the ejector rod, the jacking block and the bottom plate are made of medical polymer materials, and the elastic cushion block is made of medical silica gel or polyurethane.
5. The medial femoral proximal reduction distractor for preventing the wedge effect of intertrochanteric fractures according to claim 2, wherein: the plug assembly is formed in a rectangular shape as viewed in the front-rear direction.

Description

Proximal femur inner side reduction spreader for preventing wedge effect of fracture between trochanters of femur Technical Field The application relates to the technical field of medical appliances, in particular to an auxiliary appliance for orthopedic surgery, in particular to a special resetting device for controllable ejection of inner cortex of proximal femur to prevent or correct wedge effect in the internal fixation surgery of intramedullary nails for intertrochanteric fracture. Background Intertrochanteric fractures are common fractures of the hip, and the current mainstream treatment mode is closed reduction intramedullary nail internal fixation. One key difficulty in surgery is the "wedge effect". When a fracture occurs, the cortex on the medial side of the proximal femur often loses support by compression or crushing, resulting in the distal end of the fracture moving inward during reduction, forming a wedge-shaped gap on the medial side of the fracture end. If the gap fails to close, this will result in: 1) The internal fixation mechanical environment is deteriorated, the intramedullary nail and the spiral blade bear abnormal shearing stress, and the risks of internal fixation failure (such as cutting and fracture) are increased. 2) Poor fracture healing-the presence of gaps that affect callus growth may result in delayed healing or non-healing. 3) The reposition is difficult to effectively recover the continuity of the inner cortex by simply relying on axial traction and manual reposition, and the incision is often required to be enlarged for direct vision reposition, thereby increasing the operation wound, bleeding amount and infection risk. At present, a special tool which can specially, accurately and controllably push and reset the inner cortex of the proximal end of the femur from outside to inside under a minimally invasive condition so as to actively eliminate the wedge-shaped gap is lacking clinically. The doctor relies on empirical techniques or general instruments to indirectly operate, so that the pushing force and direction are not well controlled, and the effect is unstable. Disclosure of Invention In view of the foregoing, the present application is directed to a proximal medial femoral reduction distractor for preventing the wedge effect of intertrochanteric fractures. The application relates to a femoral proximal end inner side reduction spreader for preventing a wedge effect of fracture between femoral trochanters, which comprises a central upright post and an ejector rod; The lower part of the central upright post is provided with a cylindrical inserting rod which is used for being inserted and fixed in a reserved fixing hole of an operation table, so that the central upright post is positioned at the crotch position of a subject, the upper part of the central upright post is transversely and penetratingly provided with a mounting hole, the left side surface and the right side surface of the mounting hole are respectively inclined outwards, so that the mounting hole is formed into an opening with a wide front part and a narrow rear part in an eight shape, the mounting hole extends along the upper and lower directions of the upper part of the central upright post, the mounting hole is internally provided with a jacking block, the left side surface of the jacking block is pressed on the left side surface of the mounting hole, the right side surface of the jacking block is pressed on the right side surface of the mounting hole, and the jacking block is statically kept at a preset height position in the mounting hole by friction force between the jacking block and the left side surface and the right side surface of the mounting hole; the front end of the ejector rod can be rotatably provided with an ejector head assembly, the rear end of the ejector rod is fixedly provided with a wheel-shaped handle, and the middle part of the ejector rod is provided with external threads; The middle part of the ejector rod is arranged in a threaded hole of the jacking block, the ejector head component extends to the front of the jacking block and is used for pressurizing the inner side of the proximal end of the thigh of a subject, the corresponding femur lesser trochanter or the inner cortical projection area is achieved, the pressure applied to the subject by the ejector head component is adjusted by adjusting the length of the ejector rod extending from the jacking block so as to prevent the wedge effect of fracture between femur trochanters, and the wheel-shaped handle is positioned at the rear of the jacking block and is used for adjusting the length of the ejector rod extending from the jacking block. Preferably, the top head assembly comprises a bottom plate and an elastic cushion block, wherein the elastic cushion block is fixed on the front side of the bottom plate, an annular clamping ring is integrally formed at the center position of the rear side of the bottom plate, an annular prot