A method for surface layering and path planning for in-situ 3D printing

Abstract

The invention discloses an in-situ 3D printing curved surface layering and path planning method, which uses three-dimensional point clouds as input, surface layering results and three-dimensional printing paths as output, and proposes a method for calculating the depth of complex skin and soft tissue defects based on three-dimensional point clouds , and then distinguish the tissue layer of the defect site according to the defect depth value, and perform surface layering and in-situ printing path planning for different tissue layers, and generate a 3D printing path so that printing materials containing different cells can be formed on the corresponding tissue In situ 3D printing forms a multi-layer tissue structure similar to the original main skin and soft tissue structure on the skin and soft tissue defect wound, and the shape and structure of the tissue defect wound after in situ 3D printing repair are basically the same as those before the defect.

Description

technical field [0001] The invention belongs to the field of material repair and in-situ printing in 3D printing, and in particular relates to a layering and path planning method for in-situ 3D printing curved surfaces. Background technique [0002] According to the shape and characteristics of the skin and soft tissue defect of the living body, use bio-3D printing equipment to directly print biomaterials, cells and growth factors on the defect site, which can seal the wound in time, reduce the risk of infection, and can promote the repair effect and speed of the defect site , this technology is called in-situ 3D printing technology. [0003] 3D printing layering technology is one of the key technologies of 3D printing, that is, the three-dimensional object is first split into a two-dimensional plane structure by a certain method, and finally the printed part is obtained by layer-by-layer accumulation method. The thickness and method of layering directly affect the forming ...

AI Technical Summary

Problems solved by technology

The two commonly used printing paths are the parallel scanning path and the contour offset path. The former is simple to implement, but the forming accuracy is poor, and the latter has complex algorithms but high printing accuracy.

In situ 3D printing technology, most of the current methods are based on parallel scanning paths. For example, researchers from Xi’an Jiaotong University proposed a path planning method for dividing 3D point cloud surfaces by discontinuous grids when in situ 3D printing repair of rat skin. , a parallel scanning printing path is generated, but when the printing shape is complicated by this method, the end of the parallel scanning path tends to be incompletely bonded to the edge of the rat tissue defect

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