Design method of mask of surgical guide plate taking articular cartilage surface as binding surface

Abstract

A design method of a mask of a surgical guide plate taking an articular cartilage surface as a binding surface comprises the steps that data obtained through image examination are imported into a computer, a 3D digital model is established, and the surgical guide plate is designed on the basis of the 3D digital model. The surgical guide plate is characterized in that the binding surface of the mask of the surgical guide plate is matched with the cartilago articularis surface to be detected; during design, the cartilage thickness needs to be calculated by dividing the distance between the osteoarticular clearances of the joints by 2, and then the cartilage thickness is increased to the cartilage surface thickness by deviating the bone surface on the basis of a subchondral bone surface morphology 3D digital model, so that the cartilage surface morphology 3D digital model is formed; and on the basis of the artificial virtual cartilage surface 3D digital model, the cartilage surface of thebone is thickened to the thickness required by the mask in a thickening mode, and finally, the bone and the virtual cartilage surface are subtracted in a Boolean subtraction mode, so that the designof the mask of the guide plate is completed.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a design method of a surgical guide mask with the articular cartilage surface as the bonding surface. Background technique [0002] 3D printed surgical guides have been widely used in orthopedic clinical operations to guide positioning, drilling, osteotomy, reduction and other surgical operations. It is composed of guiding devices such as guide tubes and guide grooves; the basis of its guidance is to establish a mask on the surface of the bone that has a unique fit with the bone surface, and use the mask as a reference for positioning or reset, or here A guide for drilling or osteotomy is established on the mask; therefore, the accuracy of the mask is the basis for the application of the surgical guide. [0003] A mask with the bone surface as the fitting surface can usually overlap and match the fitting surface with the real bone surface seen during the operation to o...

AI Technical Summary

Problems solved by technology

[0003] A mask with the bone surface as the fitting surface can usually overlap and match the fitting surface with the real bone surface seen during the operation to obtain a precise fit; however, for a mask with all or part of the articular surface as the In other words, the situation is complicated. The completely flat articular cartilage surface and the subchondral bone surface should be cloned, but in fact all articular surfaces have curved surfaces, that is, they are not planar; although the surface shape of the curved articular cartilage surface is similar to that of The subchondral bone is similar, but the surface area of ​​the cartilage must be greater than that of the subchondral bone; because the image of the articular cartilage is difficult to obtain at present, that is, the cartilage does not develop, and the montmorillonite cloned based on the surface floating offset of the subchondral bone collected by the image The plate fitting surface will inevitably be smaller than the area of ​​the cartilage surface of the corresponding part, that is, the mask will not coincide with the cartilage surface, which will inevitably affect the accuracy of the surgical guide

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