Assembled distal femur tumour type bionic prosthesis containing universal assembly

A modular, femoral technology, applied in the field of medical equipment, can solve the problems of aggravating the fracture or wear of the host bone, the mismatch of the elastic modulus of the bone, and the failure of the prosthesis, so as to reduce the risk of bone loss and avoid stress shielding. effect, the effect of reducing secondary fractures

Pending Publication Date: 2021-09-24
PEOPLES HOSPITAL PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1) The current hinged knee joint does not match the motion behavior of the normal knee joint of the human body, and the multi-directional force causes the life of the prosthesis to be shortened; 2) The CoCrMo alloy does not match the elastic modulus of the bone, and stress shielding is prone to occur after implantation. While accelerating the

Method used

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  • Assembled distal femur tumour type bionic prosthesis containing universal assembly
  • Assembled distal femur tumour type bionic prosthesis containing universal assembly
  • Assembled distal femur tumour type bionic prosthesis containing universal assembly

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049] Example 1

[0050] In this example, the polymerization of PEEK is 105, and the number average molecular weight is 34,000, the weight average molecular weight is 3.2-3.8, wherein the content of carbon fibers is 30% by weight, CFR-Peek The mechanical properties and density are shown in Table 1.

Example

[0051] Example 2 ~ 6

[0052] Examples 2 to 6 The difference from Embodiment 1 is that the content of carbon fibers is different, and the specific test results are shown in Table 1.

[0053] Table 1 Effect of Different Carbon Fibers on the Mechanical Properties and Density of PEEK

[0054]

[0055] As can be seen from Table 1, as the proportion of carbon fibers is gradually increased, the elastic modulus strength of the prosthesis is gradually increased, and the stiffness is gradually increased, but the toughness gradually decreases. When the carbon fiber content reaches 60%, the material has completely no plastic function, which is very hard, and this material is not suitable for preparation of joint prosthesis. Therefore, after an attempt, the mechanical properties of the final determination of 30% by weight of CFR-PEEK materials are most suitable for knee prosthesis, which combines rigidity and toughness. Further, the carbon fibers in the present invention are selected to ran...

Example Embodiment

[0056] Example 7

[0057] The present embodiment is the same as that of Example 3, wherein the content of carbon fibers is 30% by weight, and the polymerization of PEEK is 105, and the number average molecular weight is 34,000, the weight average molecular weight is 100,000, and the molecular weight distribution is 3.2-3.8.

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PUM

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Abstract

The invention relates to an assembled distal femur tumour type bionic prosthesis containing a universal assembly, which comprises the following components: a femur assembly, a tibia assembly, a buffering assembly and a universal assembly; the femur assembly comprises a distal femur; the lower end of the distal femur is provided with a first groove and two through holes located at the two ends of the first groove; the tibia assembly comprises a tibia platform; a second groove is formed in the tibia platform; the buffering assembly comprises a liner; the liner is arranged at the upper end of the tibia platform; the universal assembly comprises a universal shaft and a pin shaft; the upper end of the universal shaft is installed in the first groove; the lower end of the universal shaft is installed in the second groove; and the pin shaft is arranged between the two through holes in a penetrating mode and used for connecting the distal femur and the tibia platform together. According to the invention, the integrated universal assembly is added into the distal femur tumour type prosthesis; stress borne by the prosthesis is effectively dispersed; and the service life of the prosthesis is prolonged.

Description

technical field [0001] The invention relates to a modular distal femur tumor-type bionic prosthesis containing a universal component, which belongs to the technical field of medical equipment. Background technique [0002] The distal femur is a common site for malignant bone tumors. The current method of treating malignant bone tumors in this area is mainly to resect the tumor segment, remove the tumor completely, and then use artificial hinged knee joint prosthesis to reconstruct the defective bone. [0003] There are two major disadvantages in the currently commercially available distal femur tumor-type hinge knee joints: [0004] 1. From the design point of view: Currently, there are only two types of tumor-type distal femoral prosthesis on the market: simple hinge and rotary hinge. These two simple structural designs have greatly restricted the movement of the knee prosthesis in all directions, which is very different from the normal knee joint activities (flexion, ext...

Claims

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Application Information

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IPC IPC(8): A61F2/38A61L27/08A61L27/18A61L27/50
CPCA61F2/3859A61F2/389A61L27/18A61L27/08A61L27/50A61F2002/2825A61F2002/2892A61F2002/30329A61L2430/02C08L61/16
Inventor 郭卫郭煜
Owner PEOPLES HOSPITAL PEKING UNIV
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