METHOD FOR MANUFACTURING MEDICAL PRODUCTS FROM PLASTIC USING SLA TECHNOLOGY WITH GRADIENT ILLUMINATION Russian patent published in 2023 - IPC B32B7/02 

FIELD: 3D objects manufacturing.

SUBSTANCE: present invention relates to the field of manufacturing 3D objects by additive technologies and can be used in various industries, including medicine in the manufacture of plastic products with gradient properties, which make it possible to obtain products with uneven strength that can change in any preselected direction. The substance is a method for manufacturing medical products from plastic using the SLA technology with gradient illumination, which consists in creating an stl-model of the product in a computer-aided design system using software. The photopolymer is poured into the bath, leaving 2 mm to the edge, the bath is installed in the corresponding slots in the block, the substrate, fixed at the corresponding points with the block, is lowered into the photopolymer, leaving the minimum possible gap between the substrate and the bottom of the bath to supply the photopolymer to the substrate in order to create a minimum thin layer. A photopolymer flows into the gap between the substrate and the bottom of the bath, the block is closed with a lid, the created stl model of the product is remotely loaded into the block, the layer thickness required for this product is selected, and the 3D printer is started. The first layer of the photopolymer is created, for which, in accordance with the introduced stl-model, the areas are locally irradiated with LEDs built into the optical system: under the action of irradiation, the local irradiated area freezes and sticks to the substrate. After solidification of the local irradiated area, they continue to irradiate it, thereby carrying out additional illumination to increase strength; after additional illumination, the drives in the block lift the substrate to a height equal to the selected layer thickness. A second layer of photopolymer is created, for which, after lifting the substrate, a new portion of the photopolymer flows into the gap and displaces the first portion of the photopolymer upwards. In accordance with the introduced stl-model, new areas are locally irradiated with LEDs built into the optical system. Since close layers are located relative to each other with a slight offset, the hardened second layer adheres to the first layer; increase the time of additional illumination of the second layer in comparison with the first layer in order to increase the strength of the second layer, while, since the strength of the second layer is higher than that of the first layer, a strength gradient of plastic materials is obtained.

EFFECT: invention provides high accuracy of manufacturing medical devices, less time and material consumption, the possibility of using one type of material in the manufacture, the presence of gradient properties, for combining flexibility and strength in one product.

1 cl, 4 dwg