Porous tantalum metal hollow screw and application thereof

A technology of hollow screw and porous tantalum, which is applied in medical science, internal bone synthesis, fastening devices, etc., can solve the problems of poor biomechanical performance, internal fixation screw breakage, and insufficient mechanical strength, and is beneficial to implementation and clinical application. Effects of application, pain relief, and low cost

Active Publication Date: 2015-12-16
赵德伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are common clinical problems such as complex structure, weak biomechanical efficiency, insufficient mechanical strength, and the need for secondary removal. In the application, problems such as internal fixation screw breakage and fracture re-displacement often occur.

Method used

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  • Porous tantalum metal hollow screw and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, a hollow screw made of porous tantalum metal comprises a screw 1 and a nut 2, the screw 1 and the nut 2 are integrally formed, the outer surface of the front section of the screw 1 has a thread 11, and the length of the thread 11 is The length ratio of the screw 1 is 1:2, the nut 2 is a conical nut with a cylindrical nail head, the angle between the conical surface of the conical nut and the centerline of the screw is 45°, and the cylindrical The two side outer surfaces of the shaped nail head are symmetrically provided with grooves 21 with the center line of the screw rod, and the angle between the two slopes of the groove 21 is 60°. And between the nut 2 is a smooth slide bar.

[0037] in:

[0038] The pitch of the thread 11 is 4mm, the width of the thread 11 is 2mm, the difference between the outer diameter and the inner diameter of the thread 11 is 10% of the diameter of the screw rod 1, and the lead angle of the thread 11 is 91°; 11 is...

Embodiment 2

[0047] The porous tantalum metal hollow screw described in Example 1 is prepared by the following method:

[0048] (1) The graphite carbon skeleton with a porosity of 85% was etched with dilute hydrochloric acid for 10 minutes, washed with water and ethanol in turn, dried with nitrogen, and placed in the reaction chamber;

[0049] (2) Put the carbon pentachloride powder with a particle size of 400 mesh into the source tank, heat it to 150°C, and use high-temperature argon (300°C) as the carrier gas to pass into the reaction chamber, and the flow rate of the carrier gas is 100ml / min , the temperature of the reaction chamber is 1050°C, and the vacuum degree of the reaction chamber is 10Pa; while the tantalum pentachloride powder is passed into the reaction chamber with argon as the carrier gas, hydrogen is passed into the reaction chamber at a flow rate of 120ml / min, and the reduction reaction is carried out for 4 hours. The tantalum metal reduced to metal powder is evenly depos...

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Abstract

The invention discloses a porous tantalum metal hollow screw which comprises a screw rod and a screw cap. The screw rod and the screw cap are integrally formed. A thread is arranged on the outer surface of the front end of the screw rod, and the length ratio of the thread and the screw rod is 1:1.7-2.3. The screw cap is a conical screw cap with a cylindrical screw head, an included angle between the conical surface of the conical screw cap and the central line of the screw rod ranges from 44 degrees to 46 degrees, grooves symmetric about the central line of the screw rod are formed in the outer surfaces of the two sides of the cylindrical screw head, the included angle between the two inclined faces of each groove is 60 degrees, a through hole is formed in the central axis of the screw rod, and a smooth sliding rod is arranged between the thread and the screw cap. By means of the structure of the hollow screw, screwing-in and firm fixation of the hollow screw are facilitated, secondary displacement at a bone fracture part is avoided, the defect that the tail part of the screw is deformed when the screw is screwed in is overcome, force can reach the front end uniformly, and the possibility of deformation and cracking of the screw is reduced.

Description

technical field [0001] The invention relates to a medical permanent implant, in particular to a porous tantalum metal hollow screw of the medical implant used for the treatment of femoral neck fracture. Background technique [0002] Femoral neck fracture is a common clinical disease. There is also some controversy regarding its treatment. Most scholars believe that the treatment principles for fresh femoral neck fractures should be early, anatomical reduction, and firm fixation. However, the current internal fixation methods basically use cannulated compression screws. At present, hollow screws made of titanium are mostly used clinically. Although certain clinical effects have been achieved, they have no clinical disadvantages such as induction of bone formation and secondary removal. [0003] Porous medical metal implant materials have important and special uses such as treating bone tissue trauma and inducing bone tissue regeneration. The common materials of this type inc...

Claims

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Application Information

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IPC IPC(8): A61B17/86A61L31/08
CPCA61B17/861A61B17/862A61B17/8625A61B17/864A61B17/866A61B2017/00526A61B2017/00831A61L31/082A61L2420/02
Inventor 赵德伟王本杰谢辉黄诗博尉晓蔚王威
Owner 赵德伟
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