Method for designing and preparing personalized segmental bone implant based on selective laser melting technology

Abstract

The invention provides a method for designing and preparing a personalized segmental bone implant based on a selective laser melting technology; a regular-gradient porous structural model of the segmental bone implant is designed using the computer-aided design technology according to characteristics and requirements of a patient in combination with CT scanning results; model data are imported into finite element analysis software, biomechanical analysis is performed on the data by means of a finite element method, implant model optimization is carried out according to the biomechanical analysis results, and a reinforcing rib structure with improved strength is designed inside the model; a transition arc structure for reducing stress concentration is designed on a surface layer of the model; a cylindrical hole structure for fixing use is designed. Optimized model slicing and layering, scanning path planning, scanning parameter setting and the like are carried out through rapid formingassist software, processing data are imported into metal selective laser melting molding equipment to complete printing, and finally a regular-gradient porous segmental bone implant with reinforcing ribs, transition arcs and fixing holes is obtained.

Description

technical field [0001] The invention relates to a method for a personalized segmental bone implant, in particular to a design and preparation method for a personalized segmental bone implant based on a selective area laser melting technique. Background technique [0002] At present, the clinical treatment methods for bone defects include autologous or allogeneic bone transplantation and artificial bone transplantation. Although the former has less rejection and faster recovery, the collection of raw materials is complicated and the bone source is limited, which will cause secondary trauma and affect the repair effect; artificial bone transplantation does not have the problem of insufficient bone source, but it is difficult to combine with human bone tissue at high strength. The matching of the bone is poor. For patients with bone defects, the traditional dense structure and uniform porous structure are difficult to meet the requirements of the best mechanical and biological ...

AI Technical Summary

Problems solved by technology

Although the former has less rejection and faster recovery, the collection of raw materials is complicated and the bone source is limited, which will cause secondary trauma and affect the repair effect; artificial bone transplantation does not have the problem of insufficient bone source, but it is difficult to combine with human bone tissue at high strength. The matching of the bone is poor. For patients with bone defects, the traditional dense structure and uniform porous structure are difficult to meet the requirements of the best mechanical and biological properties of the implant. Therefore, it is necessary to improve the porous structure of the implant

The porous structure is relatively complex, and it is difficult for traditional techniques to meet its precision requirements. The rapid development and close integration of digital imaging technology, computer-aided technology and additive manufacturing technology provide an effective way for the preparation of personalized segmental bone defect implants

In addition, during the implantation process of porous personalized implants, fatigue cracks and fractures are prone to occur due to stress concentration in individual parts and insufficient overall strength. These problems need to be solved urgently

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