A degradable metal cable internal fixation system and application

A fixation system, metal technology, applied in the direction of internal fixator, fixator, internal bone synthesis, etc., can solve the problems of non-degradable alloy cable, easy premature cable breakage, insufficient cable strength, etc., to reduce the stress shielding effect, reduce the Pain and economic burden, effects of good mechanical compatibility

Active Publication Date: 2022-07-05
SHANGHAI INNOVATON MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the non-degradable shortcomings of existing stainless steel, titanium and their alloy cables, overcome the shortcomings of insufficient strength of absorbable polymer (such as poly-L-lactic acid) cables, and overcome the existing non-degradable cables (including clips). Tight buckle) structure design applied in the field of degradable cables is easy to break prematurely or cable loosening, providing a combination of excellent biodegradability, biocompatibility, good flexibility, sufficient strength, and at the same time Degradable metal cable internal fixation system to avoid premature cable fracture or loosening

Method used

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  • A degradable metal cable internal fixation system and application
  • A degradable metal cable internal fixation system and application
  • A degradable metal cable internal fixation system and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Degradable metal cable internal fixation system for phalangeal fractures

[0043] like Figure 7 As shown, the present invention provides a degradable metal cable internal fixation system for phalangeal fracture and a method of using the same, the cable internal fixation system includes a cable and a clamping buckle, and the above materials are all made of degradable pure magnesium. like figure 1 As shown, the structure of the cable is 3×7, and the mechanically combined end of the degradable metal cable adopts such as Image 6 Terminal D shown; figure 2 Pillow-shaped clamp shown with internal threads on the inner wall of the clamp; no lead pins attached to the cable.

[0044] During orthopaedic surgery, first insert the end of the cable without the mechanically combined end (hereinafter referred to as the moving end) into a through hole of the pillow-shaped clamping buckle, and move the clamping buckle to the side of the mechanically combined end of the...

Embodiment 2

[0046] Example 2: Degradable metal cable internal fixation system for patella fractures

[0047] like Figure 8 As shown, the present invention provides a degradable metal cable internal fixation system for patella fracture and a method of using the same, the cable internal fixation system includes a cable, a lead pin and a clamping buckle, and the above materials are all made of degradable Mg- Preparation of Nd-Zn-Zr alloy. like figure 1 As shown, the structural formula of the cable is 7×7, and the mechanically combined end of the degradable metal cable adopts such as Image 6 Terminal B shown; Figure 4 The top-tight clamping buckle shown has teeth on the inner wall of the clamping buckle; Figure 5 Single-ended looper cable shown.

[0048] During orthopaedic surgery, first pass the movable end of the cable into one side through hole of the top-tight clamping buckle, and move the clamping buckle to the fixed end of the cable; then pass the movable end of the cable thr...

Embodiment 3

[0051] A degradable metal cable internal fixation system is different from Example 2 in that the structural formula of the cable is 7×19, and the technical effect evaluation is: the tensile strength of the cable is 440.3MPa, and the elongation after breaking is 4.9%; The corrosion rate of the corrosion test (immersed in Hank's solution for 10 days) was 0.24mm / y; the in vitro cell test (MTT method was used, the extraction ratio was 1.25cm) 2 / ml, L-929 cells, MEM containing 10% (V / V) calf serum) showed that the relative proliferation rate of cells in the experimental group was 89%, and the cytotoxicity was grade 1; the cable internal fixation system healed well after implantation, No ectopic or detached cables were found, and the complete degradation time was about 26 months.

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Abstract

The invention discloses a degradable metal cable internal fixation system and its application, and relates to the field of passive implantable medical instruments; the cable internal fixation system is composed of a cable and a clamping buckle. The degradable metal cable is formed by helically twisting M degradable metal cables, and the degradable metal cable is formed by helically twisting N degradable metal wires; both ends of the degradable metal cable are provided with welding areas or terminals ; One end of the degradable metal cable is provided with a clamping buckle; the materials of the cable (including the end head) and the clamping buckle include pure magnesium and magnesium alloy materials, pure zinc and zinc alloy materials, pure iron and iron alloy materials; one end of the degradable metal cable A lead needle can be provided; when the cable is used for internal fixation, it can degrade and disappear in the body without the need for secondary surgery to be taken out, so as to avoid long-term immune rejection. At the same time, the invention improves the design scheme of the clamping buckle to relieve stress concentration and delay The loosening of the cable allows the cable internal fixation system to have a longer effective fixation time and ensure complete bone repair.

Description

technical field [0001] The invention relates to passive implantable medical instruments, in particular to a degradable metal cable internal fixation system and its application. Background technique [0002] The cable internal fixation system currently used in the clinical field is mainly made of non-degradable stainless steel or titanium alloy, which is mainly used for bundling and fixation after fracture. There are also many problems in clinical application. Stainless steel wire is the earliest developed bone cable material. It not only has good comprehensive mechanical properties, but also has excellent corrosion resistance. However, subsequent studies have shown that the tightening process and implantation of stainless steel wire used for fracture fixation in implantation. It is prone to fracture after insertion, which adversely affects fracture healing. [0003] In order to solve the above problems, the researchers chose titanium alloy cables with better flexibility to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/68A61B17/82A61L31/02A61L31/14
CPCA61B17/68A61B17/82A61L31/022A61L31/148
Inventor 张健尹林卢文龙董迪昇沈钦硕
Owner SHANGHAI INNOVATON MEDICAL TECH CO LTD
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