Medical porous implant material
A porous material and cavity technology, applied in the field of porous materials for medical implants, can solve the problems of inability to repair and regenerate materials, insufficient depth of bone ingrowth, and insufficient uniformity of bone ingrowth, so as to promote accelerated flow and improve capillary force effect
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Embodiment 1
[0022] The porous material in this example is made of tricalcium phosphate, which is a secondary porous material. The first-stage cavity diameter in the body is 100 μm-400 μm, and the second-stage cavity diameter is 110 nm-300 nm. The same-level pores are interconnected. , and the cavities at all levels are also connected to each other. Its preparation method is as follows:
[0023] (1) Material preparation
[0024] Irregularly shaped tricalcium phosphate powder with a maximum particle size of 20nm-30nm, methyl cellulose with a particle size of 200nm-400nm as a pore-forming agent, polyvinyl butyral powder, and distilled water in a volume ratio of 3:7:5 : 15 to make a slurry; ultrasonically disperse for 30min, and stir repeatedly for 3h, then dry at 150°C.
[0025] (2) Evenly mix the dried powder obtained above with urea with a particle size of 180 μm-500 μm as a pore-forming agent according to a volume ratio of 1:4, put it into a mold and press it into a dense green body;
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Embodiment 2
[0034] This example is similar to Example 1, except that during preparation, the material preparation in step (1) is changed to: irregularly shaped tricalcium phosphate powder with a maximum particle size of 20nm-30nm, the particle size of the pore-forming agent 400nm-500nm methyl cellulose, 90nm-240nm diameter polylactic acid fiber, polyvinyl butyral powder and distilled water with a diameter of 90nm-240nm and a length of 2μm are prepared into a slurry according to the volume ratio of 3:7:3:5:15; ultrasonic dispersion 30min, and repeatedly stirred for 3h, then dried at 150°C. Step (2) is changed to: mix the obtained dried powder with urea with a particle size of 180 μm-500 μm as a pore-forming agent and polylactic acid fibers with a diameter of 82 μm-330 μm and a length of 900 μm in a volume ratio of 1:1:8 Mix evenly to make a dense green body. The prepared porous tricalcium phosphate has two levels of pores, and the two levels are graded according to the size of the pores; ...
Embodiment 3
[0039] The porous material in this example is prepared from hydroxyapatite, which is a secondary porous material, which is graded according to the size of the pores. There are second-stage cavities on the wall of the primary cavity, and the same-level cavities are connected to each other, and the cavities of each level are also connected to each other. Its preparation method is similar to that of Example 1, wherein the maximum particle size of the irregularly shaped hydroxyapatite powder is 160nm-200nm.
[0040] Tested according to the method of Example 1, the surface roughness Ra value of the secondary hole reaches 87nm.
[0041] According to the method of Example 1, the porous hydroxyapatite of this example was made into a sample of 10 mm × 10 mm × 60 mm and put into a shallow cup for water test. The water rose to the top of the sample along the porous tricalcium phosphate in 38 seconds. According to the implementation Example 1 Test method Further test, water rises 1650mm ...
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