Artificial femoral stem for fracture surgery around hip joint prosthesis

A technology of hip joint prosthesis and femoral stem, applied in the direction of hip joint, prosthesis, femoral head, etc., can solve problems such as difficult to use, high fracture redisplacement rate, difficult to obtain satisfactory curative effect, etc. Minimize wounds and reduce economic burden

Inactive Publication Date: 2012-07-11
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the medullary cavity in the femoral fracture area is occupied by the prosthetic stem, the conventional internal fixators used for femoral fractures, such as intramedullary nails, bone plate screws, etc., are difficult to use because they cannot pass through the medullary cavity occupied by the prosthetic stem
However, unreliable internal fixation methods such as steel wire or hoop band tying, oblique penetration of screws, fixation of the proximal side of the bone plate with cable ties and distal screw fixation can only be used. High rate of fracture redisplacement
Difficult to achieve satisfactory results, especially for comminuted or spiral fractures

Method used

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  • Artificial femoral stem for fracture surgery around hip joint prosthesis
  • Artificial femoral stem for fracture surgery around hip joint prosthesis
  • Artificial femoral stem for fracture surgery around hip joint prosthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see Figure 1 to Figure 6 , the artificial femoral stem of the present embodiment for hip joint periprosthetic fracture surgery is especially suitable for comminuted intertrochanteric fractures, the artificial femoral stem mainly includes an artificial femoral stem, the artificial femoral stem consists of femoral shaft 1 and femoral head 2, the proximal end edge of the femoral shaft 1 is provided with an upwardly inclined femoral neck 1-1, the root of the femoral neck 1-1 is provided with a neck collar 1-2, and the upper end of the femoral neck 1-1 is provided with a step. The above-mentioned femoral head 2 is set on the step; the center of the proximal end surface of the femoral shaft 1 is provided with a threaded hole 1-4, and the threaded hole 1-4 is coaxial with the femoral shaft 1. The outer wall of the proximal end of the femoral shaft 1 is provided with three screw holes 1-3. When the artificial femoral handle was implanted into the human femur 8, two of the scre...

Embodiment 2

[0051] see Figure 12 and Figure 13 The difference between the artificial femoral stem used for hip joint prosthetic fracture surgery in this embodiment and embodiment 1 is that two screw holes 1- 3. One of the screw holes 1-3 is located in the greater trochanter region 8-2 corresponding to the human femur 8 on the femoral shaft 1, and its axis is located in the longitudinal section of the femoral shaft 1 through the femoral neck 1-1 and the axis of the femoral shaft 1 The above-mentioned distance between the entrance center of the screw hole 1-3 corresponding to the greater trochanter region 8-2 of the human body femur 8 and the proximal end face of the femoral shaft 1 is 3mm, and its axis is toward the femoral shaft 1 of the artificial femoral handle The proximal end is inclined, and the included angle with the cross section of the femoral shaft 1 is 15°; the setting position of the other screw hole 1-3 in the above-mentioned two screw holes 1-3 corresponds to that of the ...

Embodiment 3

[0055] see Figure 15 and Figure 16 The difference between the artificial femoral stem used for hip joint periprosthetic fracture surgery in this embodiment and embodiment 1 is that only one screw hole 1 is provided on the outer wall of the proximal end of the femoral shaft 1 in this embodiment -3, the screw hole 1-3 is located on the lower part of the femoral shaft 1 corresponding to the lesser trochanteric area 8-1 of the human femur 8, and runs through the femoral stem 1 transversely. The screw holes 1-3 provided at the distal end of the femoral shaft 1 in this embodiment are the same as those in Embodiment 1.

[0056] see Figure 17 , in this case using Figure 15 and Figure 16 The shown artificial femoral stem is used for the implantation guide frame of the periprosthetic fracture of the hip joint. In this embodiment, the arc-shaped plate 4 extends downward with two lower extensions 4-2; the guide There are two cylinders 5, which are respectively installed on the l...

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Abstract

The invention relates to an artificial femoral stem for a fracture surgery around a hip joint prosthesis, wherein a proximal end of a femoral shaft (1) of the artificial femoral stem is provided with at least one bolt hole (1-3) on the external wall; and a distal end is provided with one bolt hole (1-3) transversely penetrating through the femoral shaft (1). The invention also relates to a screw implant guiding frame for performing the fracture surgery around the hip joint prosthesis by the artificial femoral stem, wherein the screw implant guiding frame is constituted by a positioning arm (3), a positioning rod (7), an arc plate (4) below the positioning arm (3), and a guiding cylinder (5) which is installed on the arc plate (4) and is colinear with the bolt hole (1-3). The invention is applicable to secondary fracture surgery around the prosthesis after hip joint replacement surgery, and is beneficial for improving a fixation effect and improving the surgery quality.

Description

technical field [0001] The invention relates to a human body internal fixation device, in particular to a human body femur fracture fixation device. Background technique [0002] In recent years, the number of patients undergoing hip arthroplasty (THA) and revision surgery has been increasing. After THA, the survival time of elderly patients is prolonged and the activity level is increased, which increases the incidence and complexity of femoral periprosthetic fractures. Periprosthetic femoral fractures have become the third leading reason for total hip revision in Swiss patients. It has been reported that the incidence of femoral periprosthetic fractures accounts for about 1.1% of primary replacements and 4% after revisions. Peripsthetic femoral fractures that occur during or after artificial hip replacements are due to the presence of prosthetic stems. , the general bone plate or intramedullary nail is difficult to apply, but the method of steel wire or band cerclage or c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/32A61F2/46
CPCA61F2/36A61F2002/30001
Inventor 李松建于博陈彦
Owner SOUTHERN MEDICAL UNIVERSITY
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