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Internal fixation system and use method thereof

A technology of fixation system and bone plate, applied in the field of internal fixation system, can solve problems such as inability to achieve fixation effect, fixation failure, and impractical application of internal fixation system, so as to reduce hospitalization rate and hospitalization time, avoid stress shielding effect, and be reliable. The effect of internal fixation

Active Publication Date: 2019-02-15
苏州卓恰医疗科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Based on the advantages of magnesium alloys, the corresponding magnesium alloy bone plate, but when magnesium alloy materials are used alone as an internal fixation system for long bone fractures, the biggest problem is low strength. As the degradation progresses, the mechanical properties decay rapidly, and there are fixation failures. risks of
[0004] Those skilled in the art have been trying to use magnesium alloy intramedullary nails. However, due to the galvanic corrosion effect, there is a problem of accelerated corrosion at the contact between the bioinert material bone plate and the magnesium alloy intramedullary nail, and the expected fixation effect cannot be achieved. This defect has made the internal fixation system unable to be practically applied, so there is still room for further improvement

Method used

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  • Internal fixation system and use method thereof
  • Internal fixation system and use method thereof
  • Internal fixation system and use method thereof

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Embodiment 1

[0042] In this embodiment, magnesium-calcium alloy bone screws combined with titanium alloy bone plates, and an internal fixation removal forceps are used for minimally invasive treatment of limb bone fractures with low load-bearing strength. The bone screw is a conventional cortical bone screw processed from a magnesium-calcium alloy extruded rod with a Ca mass fraction of 3%. The total content of impurity elements Al, Cu, Fe, Mn, Ni and Si in the magnesium-calcium alloy is less than 0.01%. The ingot is obtained through a secondary extrusion process to obtain a 6mm diameter rod. The extrusion ratios of the two extrusions are 3.8 and 122.7 respectively, and the extrusion temperature is 280-380 degrees. The tensile strength of the bar is 310MPa, the yield strength is 253MPa, the elongation after fracture is 11%, the reduction of area is 13%, and the microhardness is 65.3Hv. The magnesium-calcium alloy rod is machined into a bone screw, and a layer of calcium-phosphorus biocera...

Embodiment 2

[0057] In this embodiment, the internal fixation system needs to be used with a guide to perform minimally invasive treatment of limb bone fractures with low load-bearing strength, and the bone screws are magnesium-zinc-calcium screws.

[0058] The bone screw can be a locking screw or a non-locking screw, which is not limited here. The bone screw in this embodiment is made of a forged magnesium-zinc-calcium alloy bar with a mass fraction of Zn of 3% and a mass fraction of Ca of 0.5%. The total content of impurity elements Al, Cu, Fe, Mn, Ni and Si in the magnesium-zinc-calcium alloy is less than 0.01%. The ingot is obtained by a hot swaging process to obtain a rod with a diameter of 6mm, the swaging temperature is 200-350 degrees, and the total deformation rate of the section is 96%. The obtained rod has a tensile strength of 385MPa, a yield strength of 320MPa, an elongation after fracture of 12%, a reduction of area of ​​15%, and a microhardness of 71.2Hv.

[0059] The magne...

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Abstract

The invention relates to an internal fixation system and a use method thereof. The internal fixation system comprises a bone fracture plate of an inert biological material and a bone fracture screw ofone or more capable of degrading a magnesium alloy, and may further comprise an internal fixation extraction forceps in actual use. The invention also discloses a use method of the aforementioned internal fixation system. The internal fixation system and the use method have the advantages of a traditional internal fixation system, and utilize the feature that the position that the bone fracture plate is in contact with the bone fracture screw easily generates galvanic corrosion so that corrosion residual screws can be simply and quickly cut off when taking out the bone fracture plate, and screw rod parts of the remaining bone fracture screws can remain in a human body, thereby reducing the hospitalization rate and hospitalization time of patients, and improving the surgical satisfaction of the patients.

Description

technical field [0001] The present invention relates to an orthopedic medical device, in particular to an internal fixation system and its usage. Background technique [0002] In orthopedic treatment, long bone fracture of extremities is a common and frequently-occurring disease clinically. With the extensive development of orthopedic minimally invasive surgery, the superiority of minimally invasive surgery is becoming more and more obvious. In the treatment of limb long bone fractures, open reduction and internal fixation and closed reduction and internal fixation are mostly used clinically. The internal fixation system used is bone plate, marrow Mainly inner nails. The metal materials used in these implants are mostly stainless steel, pure titanium or titanium alloy, which have good strength and toughness, and can form a strong fixation effect on the fracture. Although stainless steel and titanium alloys are biologically inert materials, they may react with the complex b...

Claims

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Application Information

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IPC IPC(8): A61B17/80A61B17/86
CPCA61B17/80A61B17/8052A61B17/808A61B17/86A61B17/8625
Inventor 展京美王以朋李政垚王勇益明星肖杰
Owner 苏州卓恰医疗科技有限公司
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