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Partial-thread magnesium alloy fixing screw for cancellous bone and preparation process thereof

A fixing screw and preparation technology, which is applied in the field of orthopedic instruments, can solve problems such as insufficient pressurization effect, low fastening strength, easy slipping wire twisting, etc., and achieve the effect of complete reduction and rapid healing

Pending Publication Date: 2020-02-28
ZHUHAI INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention proposes a partially threaded magnesium alloy fixation screw for cancellous bone and its preparation process. The screw has high fastening strength, sufficient compression effect and good mechanical properties, which can greatly improve the current The common problems of magnesium alloy screws are low fastening strength, insufficient compression effect and easy slipping wire torn off

Method used

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  • Partial-thread magnesium alloy fixing screw for cancellous bone and preparation process thereof
  • Partial-thread magnesium alloy fixing screw for cancellous bone and preparation process thereof
  • Partial-thread magnesium alloy fixing screw for cancellous bone and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This embodiment provides a partially threaded magnesium alloy fixation screw for cancellous bone, such as Figure 4 with Figure 5 As shown, including nail rod 2; and

[0050] A nail head 1 integrally formed with the nail shank 2;

[0051] The nail shank 2 is provided with a first thread 5, the ratio of the length of the first thread 5 to the length of the nail shank 2 is (0.3-0.5): 1, and the depth of the first thread 5 is 30-45% of the diameter of the nail shank 2;

[0052] The top of the nail head 1 is provided with a hole groove 3, and the side of the nail head 1 is provided with a second thread 4, the length of the second thread 4 is 50% of the length of the nail head 1, and the depth of the second thread 4 is 50% of the length of the nail head 1. 10-20% of the diameter.

[0053] Among them, the top of the screw head 1 is provided with a hole-shaped groove 3, which can effectively avoid the twisting of the sliding wire of the screw and improve the mechanical pro...

Embodiment 2

[0057] This embodiment provides a preparation process for a partially threaded magnesium alloy fixation screw for cancellous bone, the preparation process is as follows Figure 8 As shown, the steps include:

[0058] S1: After the magnesium alloy raw material 6 is vacuum smelted, the magnesium alloy ingot 7 is obtained by casting;

[0059] S2: After the magnesium alloy ingot 7 is subjected to solution treatment, the magnesium alloy round ingot 8 is obtained by turning and skinning;

[0060] S3: After the magnesium alloy round ingot 8 is preheated, the magnesium alloy rod 9 is obtained by plastic extrusion;

[0061] S4: After annealing the magnesium alloy rod 9, a partially threaded magnesium alloy fixing screw for cancellous bone is obtained through precision machining.

[0062] Wherein, the temperature of vacuum smelting is 700-760°C. Stirring is carried out while vacuum smelting, and the stirring time is 1 to 2 hours. After the vacuum smelting is completed, a magnesium a...

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Abstract

An embodiment of the invention provides a partial-thread magnesium alloy fixing screw for the cancellous bone and a preparation process thereof. The partial-thread magnesium alloy fixing screw comprises a screw rod and a screw head and is characterized in that the screw rod and the screw head are integrally formed, the screw rod is provided with a first thread, the length of the first thread is identical with the length of the screw rod, the depth of the first thread is 30-45% of the diameter of the screw rod, the first thread is a deep thread, the magnesium alloy screw can perform sufficientcompression when being implanted into different types of bone tissue, and thorough restoration and fast healing of a bone fracture part are benefited. The preparation process is simple in operation steps, low in processing cost and convenient in batch production.

Description

technical field [0001] The invention belongs to the technical field of orthopedic instruments, and in particular relates to a partially threaded magnesium alloy fixation screw for cancellous bone and a preparation process thereof. Background technique [0002] At present, the commonly used intraosseous fixation screws are mainly made of inert metal materials such as stainless steel, titanium alloy, and cobalt-chromium alloy. Non-degradable, it will cause problems such as mechanical friction damage, toxic ion precipitation, local inflammatory response and stress shielding effect during its long-term service, which will seriously affect the healing of bone tissue and can lead to osteoporosis and even the risk of re-fracture . [0003] In view of the above reasons, researchers have developed a magnesium alloy fixation screw, which has the following significant advantages: (1) Good biological safety. Magnesium is an essential nutrient element for the human body. It can not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72C22C1/02C22F1/06
CPCA61B17/7216A61B17/725A61B2017/00831C22C1/02C22F1/06
Inventor 马国睿吴锋张凌风
Owner ZHUHAI INST OF ADVANCED TECH
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