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porous metal rod

A porous metal and round rod technology, applied in the field of medical implanted porous metal rods, can solve the problems of affecting the fixation effect, prolong the operation time, and spend the tapping time, and achieve a good fixation effect, reduce the operation time, and reduce the stress. Effect

Active Publication Date: 2020-11-20
CHONGQING RUNZE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Because the existing porous metal rod has a threaded structure, special tapping tools are required during implantation, and it takes a certain amount of tapping time, which prolongs the operation time. In some patients, the tapping effect in the bone is not good, which affects the fixation. Effect

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] The porous metal rod structure of the present embodiment is as figure 1 As shown, the porous metal rod body 1 is made of metal tantalum, and the porous metal tantalum material is prepared by foam impregnation. The needle 4 is made of dense metal tantalum, the minimum wall thickness of the blind hole is 3 mm, the rounded corner r1 at the bottom of the straight wall hole 1-3-2, and the rounded corner r2 at the junction of the small end 1-1 and the big end 1-2 of the body 1 is 1.7mm, the threaded hole 1-3-1 of the blind hole 1-3 inside the big end 1-2, the thread of the threaded part 2-1 of the propulsion shaft is a circular thread, the root fillet radius r3 is 0.6mm, and the convex pin 4 The diameter d is 1mm.

[0034]According to the design of this embodiment, 2arctg ((l-b) / z)=15.8°, α is 16.5°, which meets the requirement of α≥2arctg((l-b) / z), so that the protruding pin 4 is pushed into the bone installation hole on the porous metal rod When the through hole 1-3-3 on ...

Embodiment 2

[0036] For this example see Figure 8 , similar to Example 1, the difference is that the large end 1-2 of the porous metal rod body 1 gradually decreases in diameter through the transition part 1-4 and transitions to the small end 1-1, the material used is metal niobium, and the diameter of the protruding pin 4 is d is 2mm, the porosity of the prepared porous niobium is 85%, and the pore diameter is 450µm-600µm.

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Abstract

A porous metallic bar includes a body made of a porous metallic material; the body is circular bar-shaped, and includes a big end and a small end; a blind hole is formed in the big end; a part near an outer end of the big end, in the blind hole is a threaded hole, and the other part is a straight wall hole; a propulsion shaft is arranged in the blind hole; the propulsion shaft includes a threaded portion and a conical shaft portion; the diameter of an axial outer side surface of the conical shaft portion is gradually and linearly decreasing from the big end near the threaded portion to an outer part; lateral blocks are arranged in the blind hole; inner side surfaces of the lateral blocks match the axial outer side surface of the conical shaft, and outer side surfaces match the straight wall hole of the big end; through holes are distributed and formed in a wall of the straight wall hole; convex needles are arranged in the through holes; each convex needle includes a cylindrical portion and a conical portion having a sharp, the sharp points outward, the length 1 of the convex needle is greater than the thickness b of the wall of the straight wall hole of the big end; and the conical angle Alpha of the conical shaft, the length 1 of the convex needle, the thickness b of the wall of the straight wall hole of the big end, and the length z of the conical shaft portion satisfy Alpha>=2arctg((1-b) / z). The porous metallic bar can avoid bone internal tapping, can shorten the operation time, and has a good fixing effect.

Description

technical field [0001] The invention relates to the field of prostheses, in particular to a medically implanted porous metal rod for treating early and mid-term necrosis of the femoral head. Background technique [0002] Femoral head necrosis is a pathological process in which the blood supply of the femoral head is destroyed and the degeneration of bone cells leads to the death of the active components of the bone caused by various reasons. The early clinical symptoms are chronic pain of the hip joint on the affected side, mobility dysfunction and progressive claudication. If it develops further, it will develop into osteoarthritis of the hip joint until it leads to joint stiffness and persistent joint pain. It is one of the common clinical diseases. The number of people with necrosis of the femoral head in my country is very large, and it often occurs in young adults aged 30-50. Total hip replacement will have a serious impact on personal life and work. [0003] With the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/28
CPCA61F2/28A61F2/2846A61F2002/2825A61F2002/2835A61F2002/30332A61F2002/30433A61F2310/00011A61F2310/00017A61F2310/00023A61F2310/00029A61F2310/00095A61F2310/00131
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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