The First Affiliated Hospital of Sun Yat-sen University

Guangzhou Heygears Imc. Inc

Peihui Wu

Songlin She

Heyuan Huang

Ming Fu

Xin Wan

Peiyan Gui

Weiming Liao

Puyi Sheng

Weitao Li

Disclosed are a method and system for optical calibration of a 3D printer. The method includes: projecting, by an optical apparatus, a projection image to a projection platform, placing a calibration plate on the projection platform, and capturing the projection platform; identifying the coordinates of calibration points and the coordinates of actual projection points according to the captured image to obtain a matrix of calibration points and a matrix of actual projection points; rotating and translating the matrix of the calibration points and/or the matrix of the actual projection points, and calculating a distance value Tbetween the calibration points and the actual projection points in an image coordinate system; converting the Tin the image coordinate system into an offset Cin a pixel coordinate system, and inversely distorting an initial ideal projection image according to the offset Cto offset optical distortion.

Method and system for optical calibration of 3D printer

The present invention has a simple structure which is convenient in preparation and easy to use. Moreover, in combination with three-dimensional preoperative analysis and rapid molding technology, the present invention has a high customized precision and clinical applicability, and is cost-effective. Based on the three-dimensional preoperative analysis and 3d printing model, the problems of high technical difficulty and cost of the customized accurate implantation of acetabular cup prosthesis in the total hip arthroplasty can be effectively solved, so that the learning curve of operator can be shortened. The present invention can realize the customized accurate implantation of acetabular cup prosthesis without fitting the positioning guiding module with the articular surface area, so that the assisted positioning and assisted reaming depth determination are realized without removing the guiding module when the acetabulum is being reamed, thus the accuracy of the assisted positioning can be guaranteed.

Positioning guiding device and positioning method thereof for acetabulum reaming and acetabular cup prosthesis implantation

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Guangzhou, China

Peihui Wu