High-strength combined self-degrading expansion bone peg

A combined, self-degrading technology, applied in the fields of internal bone synthesis, medical science, fastening devices, etc., can solve the problems of non-self-degradation and easy slippage of bone nails, achieving long degradation cycle, avoiding slippage, and good corrosion resistance. Effect

Active Publication Date: 2014-10-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem: In order to solve the shortcomings of existing bone screws that cannot be self-degraded or are easy to slip, the

Method used

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  • High-strength combined self-degrading expansion bone peg
  • High-strength combined self-degrading expansion bone peg
  • High-strength combined self-degrading expansion bone peg

Examples

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Embodiment 1

[0023] The schematic diagram of the structure of the high-strength combined self-degrading expansion bone nail described in Example 1 is shown in figure 1 , figure 2 and image 3 .

[0024] exist figure 1 The outer surface of the polylactic acid expansion-type internal thread cavity is a trapezoidal inverted triangle wedge 3, and the angle between it and the surface of the thread cavity is between 70° and 90°. There is a slot at the front end.

[0025] exist image 3 The outer surface of the bone nail body 1 shown has deep threads and shallow threads, and the top of the nail body is a spherical head type cap, and the cap is provided with an inner triangular hole groove.

[0026] When the bone nail body 1 has not been screwed into the expandable internal thread cavity 2, the front end of the thread cavity is in a state of not being stretched by the nail body. The length of the bone nail body 1 is L=10mm-120mm, the diameter of the spherical head is D=6mm-12mm; the depth o...

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Abstract

A high-strength combined self-degrading expansion bone peg comprises a bone peg body (1) made of pure magnesium or magnesium alloy and an expansion internal-threaded cavity (2) located outside the bone peg body (1) and matching with the same. The surface of the middle of an inner surface taper of the expansion internal-threaded cavity (2) is provided with a high thread, the front of the inner surface taper is provided with a low thread, and the outer surface of the expansion internal-threaded cavity (2) is provided with a plurality of wedges (3) which are in trapezoidal or inverted triangle shapes and which have a 70-90 degrees angle with the outer surface. The bone peg body (1) is in the shape of a taper with a larger head; the surface of the middle of the outer surface of the bone peg body (1) is provided with a high thread, and the surface of the front of the outer surface of the bone peg body is provided with a low thread. A cap of the bone peg body (1) is provided with an internal triangular or linear slotted inner cavity (4) communicated with the bone peg body (1). When the high-strength combined self-degrading expansion bone peg is in use, the bone peg body (1) is disposed inside the expansion internal-threaded cavity (2). The high threads can be better joined with the expansion internal-threaded cavity, higher resistance and a longer path are provided for unscrewing the bone peg body, and slipping of the bone peg body is effectively avoided.

Description

technical field [0001] The invention relates to an orthopedic implant in a medical device, which belongs to the technical field of degradable bone nails, in particular to a medical high-strength combined bone nail which can be absorbed by human body. Background technique [0002] Bone nails are used as internal fixation and implantation equipment, and its selection has always been one of the difficult problems faced by orthopedic surgery. The bone nails prepared by the patent No. 200320123881.X "anti-slip clavicle nail" and the patent No. 200720178243.X "expandable bone nail" can play a certain role in preventing slippage, but there are still certain technical defects , and cannot be self-decomposed in the human body and absorbed by the human body. After the fracture heals, a second operation is required to remove it, causing secondary damage to the patient. The bone nail prepared by the patent No. 201120074842.3 "high-strength absorbable bone nail combination" can eventual...

Claims

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Application Information

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IPC IPC(8): A61B17/86A61L31/02A61L31/06A61L31/14
CPCA61B17/863A61B17/864A61B17/866A61B17/8685A61B2017/8655A61L31/022A61L31/06A61L31/14
Inventor 储成林于红光李旋白晶郭超薛烽林萍华
Owner SOUTHEAST UNIV
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