A carbon fiber composite material bone plate and its preparation method

Abstract

The invention discloses a carbon fiber composite material bone plate and a preparation method thereof. The preparation method specifically comprises the following steps of: coiling, stacking and laying up carbon fiber prepreg cloth according to the design, preheating, pre-forming, preheating and molding; cooling, feeding into a demolding table, opening the mold, taking out the product, cleaning and drying; performing CNC machining on a bulk material according to a bone plate design drawing so as to form a bone plate blank; and performing biosafety coating treatment on the surface of the obtained bone plate blank. The bone plate is high in biocompatibility; by virtue of biological coating, the biosafety of medical implants is improved; the bone plate is close to real bone strength; the various mechanical parameters are equivalent to those of bones, the adaptation problem is solved, and a stress-shielding effect caused by stress concentration is avoided; the carbon fiber composite material bone plate has excellent X-ray penetrability, can meet the nuclear magnetic resonance testing requirements and is suitable for batch production and low in cost.

Description

technical field [0001] The invention relates to the field of orthopedic materials, in particular to a carbon fiber composite bone plate and a preparation method thereof. Background technique [0002] Traditional bone plate materials are stainless steel and titanium alloy; they have the following problems: 1. The mechanical properties, such as modulus, do not match with natural bone. If the gap is too large, it will cause stress shielding, bone resorption, bone inflammation, and then secondary surgery; 2. Long-term implantation will cause metal dissolution and cytotoxicity; 3. X-rays cannot penetrate, which will affect the follow-up inspection of postoperative recovery; 4. Since it is a metal object, MRI detection cannot be performed after implantation . [0003] CF (carbon fiber) is a high-strength, high-modulus fiber material with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microc...

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Problems solved by technology

[0002] Traditional bone plate materials are stainless steel and titanium alloy; they have the following problems: 1. The mechanical properties, such as modulus, do not match with natural bone. If the gap is too large, it will cause stress shielding, bone resorption, bone inflammation, and then secondary surgery; 2. Long-term implantation will cause metal dissolution and cytotoxicity; 3. X-rays cannot penetrate, which will affect the follow-up inspection of postoperative recovery; 4. Since it is a metal object, MRI detection cannot be performed after implantation

[0005] Patent CN1296013C discloses a carbon fiber-reinforced polyether ether ketone composite bone plate, which is obtained by mixing and granulating carbon fiber particles and polyether ether ketone and then injection molding. Since it is injection molding, it is impossible to use continuous carbon fibers with a length greater than 2cm and A continuous spreading structure can be obtained, so the reinforcing effect played by carbon fiber does not fully play a role; patent application CN2223081Y discloses a carbon fiber reinforced epoxy resin bone plate, which is to laminate carbon fiber woven cloth soaked in epoxy resin glue in parallel, It only needs to be pressurized and solidified. The products obtained by this invention are prone to fiber burrs after lathe processing, and the surrounding tissues after implantation are easily stimulated to produce inflammatory reactions.

Patent application CN104902832A discloses a bone-synthesizing device, which is prepared by overmolding or dual-material injection. Since it is injection molding, it is impossible to use continuous carbon fibers with a length greater than 2 cm and obtain a continuous spread structure. Therefore, the role played by carbon fibers Enhancement not fully working

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