Intraosseous fixing screw made of semi-threaded magnesium alloy and magnesium alloy

A technology of fixing screws and magnesium alloys, which is applied in the field of orthopedic instruments, can solve the problems of increased difficulty of use by surgical operators, insufficient holding force of the nail body, and affecting the recovery effect, etc., achieve good biological safety, avoid deformation and fracture, and accelerate healing Effect

Pending Publication Date: 2020-02-28
珠海中科先进技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the clinical application of the above-mentioned standard screws, there are often problems such as insufficient holding force of the nail body, insufficient pressure after the screw cap is screwed in, and deformation and fracture of the screw due to uneven transmission of force.
These situations not only add extra difficulty to the operation personnel, but also affect the recovery effect after operation.

Method used

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  • Intraosseous fixing screw made of semi-threaded magnesium alloy and magnesium alloy
  • Intraosseous fixing screw made of semi-threaded magnesium alloy and magnesium alloy
  • Intraosseous fixing screw made of semi-threaded magnesium alloy and magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a half-threaded magnesium alloy intraosseous fixation screw, such as Figure 8 and Figure 9 As shown, it includes a nail body 1 and a nail cap 2 integrally formed with the nail body 1. The nail body 1 is provided with a thread 11, and the ratio of the length of the thread 11 to the length of the nail body 1 is (0.3-0.5):1. The cap 2 is provided with a molded hole 21, the nail cap 2 is a pressurized nut, and the angle between the conical surface of the pressurized nut and the centerline of the nail body 1 is 20-40°.

[0053] After the screw is implanted into hard bone such as cortical bone, the pressure screw cap can form a certain angle of pressure on the surrounding bone tissue to embed again through its structural characteristics, which can further strengthen the fixation effect of the screw on the bone block and bone flap. like Figure 10 As shown, 5 of them are bone tissue. The pressurized nail cap is designed with a taper and has an ang...

Embodiment 2

[0063] This embodiment illustrates the working principle of a half-threaded magnesium alloy intraosseous fixation screw.

[0064] like Figure 12 As shown, this embodiment provides a half-thread structure in a half-thread magnesium alloy intraosseous fixation screw, so that the thread 11 is located in the two objects to be fixed, and the holding force of the screw comes from between the thread 11 and the nail cap 2 There is also the holding force of the nail body 1 itself. This design can have a better holding effect on the fixing position with high tension, and can improve the fixing strength of the screw.

[0065] During the use of magnesium alloy screws, it is necessary to use a measuring device to select a screw with a suitable length after drilling, and to expand the hole by tapping to match the thread 11, and then install and use the screw with a surgical tool. Since magnesium alloy screws have low strength and are easily deformed, they do not have self-tapping ability....

Embodiment 3

[0067] This embodiment provides a magnesium alloy for preparing a fully threaded magnesium alloy intraosseous fixation screw, including the following components in mass percentage:

[0068] Nd 0.1~8.0%,

[0069] Zn 0.1~6.0%,

[0070] Ca 0.1~6.0%,

[0071] Zr 0.1~5.0%,

[0072] The balance is Mg,

[0073] In the above magnesium alloy, the total amount of impurity elements is less than 0.05%.

[0074] A half-threaded magnesium alloy intraosseous fixation screw according to an embodiment of the present invention. The magnesium alloy includes high-purity magnesium materials, magnesium-zinc alloys, magnesium-calcium alloys, magnesium-manganese alloys, magnesium-tin alloys, magnesium-lithium alloys, and magnesium-neodymium alloys. alloy, magnesium-yttrium-based alloy, and magnesium-gadolinium-based alloy. Compared with screws made of inert metal materials, the half-threaded magnesium alloy intraosseous fixation screw processed from magnesium alloy in the embodiment of the prese...

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Abstract

The embodiment of the invention provides an intraosseous fixing screw made of semi-threaded magnesium alloy and magnesium alloy. The screw comprises a nail body and a nail cap integrally formed with the nail body, wherein the nail body is provided with threads, and the ratio of the length of the threads to the length of the nail body is (0.3-0.5): 1; a hole is formed in the nail cap; the nail capis a pressurized nail cap; and the included angle between the conical surface of the pressurized nail cap and the center line of the nail body is 20-40 degrees. The intraosseous fixing screw made of semi-threaded magnesium alloy can exert pressure on bone tissues again after the screw is completely implanted, and thus the fixation effect of the screw on bone blocks and bone flaps can be strengthened; as the screw has higher fixation strength, when the screw is implanted into hard bone such as cortical bone, deformation and fracture of threads can be avoided, and sliding and twisting breaks ofthe nail cap can be avoided; and the intraosseous fixing screw made of semi-threaded magnesium alloy has a semi-threaded structure, has a better holding effect on a fixed position with larger tension,and can improve the fixation strength of the screw.

Description

technical field [0001] The invention belongs to the technical field of orthopedic instruments, and in particular relates to a half-thread magnesium alloy intraosseous fixation screw and a magnesium alloy. Background technique [0002] At present, the commonly used intraosseous fixation screws are mainly made of inert metal materials such as stainless steel, titanium-based alloy and cobalt-based alloy. After being 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 cause re-fracture. risk. [0003] In view of the above reasons, the researchers developed a medical magnesium alloy screw, which has the following significant advantages: (1) Good biological safety. Magnesium is an essential nutrient element for the human body. It can not only serve as an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72
CPCA61B17/7216A61B17/725A61B2017/00831
Inventor 吴锋马国睿张凌风
Owner 珠海中科先进技术研究院有限公司
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