Measurement method of porosity of 3D printed titanium alloy trabecular acetabular cup

Abstract

The invention provides a method for measuring the porosity of a 3D titanium alloy trabecular bone cup, and belongs to the technical field of design and manufacture of metal implants for medical devices. The present invention mainly divides the trabecular bone acetabular cup into three regions that can represent the overall structure of the acetabular cup based on the periodic symmetry of the trabecular bone cup; Theoretical morphological figures of the trabecular bone on the surface and inside of the region; at the same time, the surface and internal trabecular bone patterns of the acetabular cup samples in the three structural regions are collected separately by digital image technology; then the trabecular bone samples at the spherical position of the designated area are compared The number of holes in the morphological graph of the trabecular bone theory model and the morphological graph of the theoretical model is used to calculate the porosity of the trabecular bone at the position. Finally, the minimum value of the surface and internal trabecular bone porosity in the three regions of the acetabular cup was taken as the porosity of the whole acetabular cup. The invention effectively solves the problem that the through-porosity of the 3D printed titanium alloy trabecular bone cup cannot be measured at present.

Description

technical field [0001] The invention relates to a method for measuring the porosity of a 3D titanium alloy trabecular acetabular cup, and belongs to the technical field of design and manufacture of medical device metal implants. Background technique [0002] At present, there have been some reports on the design and application of 3D printed titanium alloy trabecular bone prosthesis at home and abroad, but there is no corresponding test method for the test of titanium alloy trabecular bone specimens and the important index of prosthesis performance. Liu Yi and others published a device for measuring the through-porosity of a ceramic carrier using flat light, 201120211275.1, and Jiang Dacheng published a method for measuring the through-porosity of an automobile exhaust filter using parallel light and frosted glass, 201410086862.0. Using this method to detect the multi-layer porous structure of titanium alloy trabecular bone, the through-porosity of the specified section cann...

AI Technical Summary

Problems solved by technology

Using this method to detect the multi-layer porous structure of titanium alloy trabecular bone, the through-porosity of the specified section cannot be determined due to the mutual shielding of multi-layer porous materials. Translucent, the porosity of the trabecular bone of the acetabular cup cannot be measured by this method

Using the drop method to measure the porosity, it is impossible to determine the number and location of trabecular plugged holes

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