Construction system and method of 3D (three-dimensional) micro/nano-scale prefabricated vessel network of bone tissues
A micro-nano scale and construction method technology, applied in tissue regeneration, additive manufacturing, pharmaceutical formulations, etc., can solve problems that cannot be effectively solved, and achieve the effect of easy materials, high flexibility, and simple preparation process
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Embodiment 1
[0031] In this example, see Figure 1 ~ Figure 3 , a method for constructing a three-dimensional micro-nano-scale prefabricated vascular network of bone tissue, comprising the following steps:
[0032] a. Use the blend of PVA aqueous solution and chitosan solution as the sacrificial material, use absolute ethanol as the catalyst, and the aluminum alloy round shaft that can coordinate the movement as the receiving device, connect the positive electrode of the high-voltage power supply to the 3D printing nozzle, and ground The wire is connected to the rotating receiving shaft, and the fiber filament formed when there is voltage connects the nozzle to the rotating receiving shaft to form a closed path, and the direct writing process can be controlled by shortening the distance between the nozzle and the rotating receiving shaft;
[0033]b. Replace the nozzle in step a with a 20G needle, input the coding program of the sacrificial structure into the 3D printer and run it. Under th...
Embodiment 2
[0038] This embodiment is basically the same as Embodiment 1, especially in that:
[0039] In this embodiment, a method for constructing a three-dimensional micro-nano-scale prefabricated vascular network of bone tissue, using PGA as the polymer I material, includes the following steps:
[0040] a. Use the blend of PGA aqueous solution and chitosan solution as the sacrificial material, use absolute ethanol as the catalyst, and the aluminum alloy round shaft that can coordinate the movement as the receiving device, connect the positive electrode of the high-voltage power supply to the 3D printing nozzle, and ground The wire is connected to the rotating receiving shaft, and the fiber filament formed when there is voltage connects the nozzle to the rotating receiving shaft to form a closed path, and the direct writing process can be controlled by shortening the distance between the nozzle and the rotating receiving shaft;
[0041] b. Replace the nozzle in step a with a 20G needle...
Embodiment 3
[0045] This embodiment is basically the same as the foregoing embodiment 1, and the special features are:
[0046] In this embodiment, a method for constructing a three-dimensional micro-nano-scale prefabricated vascular network of bone tissue, the hydrogel uses gelatin loaded with human bone marrow mesenchymal stem cells, including the following steps:
[0047] a. This step is identical with embodiment 1;
[0048] B. this step is identical with embodiment 1;
[0049] c. After the three-dimensional micro-nano-scale sacrificial module prepared in step b is formed, coat a layer of liquid paraffin on its surface, then place it in a 37°C drying oven to dry the paraffin, and configure 15% gelatin with deionized water at the same time, Place in a 60°C water bath and stir until the gelatin particles are uniformly dissolved and the temperature drops to 30°C. At this time, add mTG enzyme (the mass ratio of gelatin to mTG enzyme is 10:1) to cross-link the gelatin solution. When prepari...
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