Porous stent for bone repair and preparation method thereof

Abstract

The invention relates to the technical field of medical device design, and discloses a porous stent for bone repair. The porous stent comprises a plurality of structural units; the outer contour of each structural unit is in a regular quadrangular prism shape, the bottom side length of the regular quadrangular prism is a, and the height is h; each structural unit comprises supporting beam columns,a central beam column and connecting rods, wherein the supporting beam columns are arranged at the four side edges of the regular quadrangular prism respectively, the central beam column is arrangedat the center of the regular quadrangular prism and is parallel to and flush with the supporting beam columns, the connecting rods are correspondingly arranged between the supporting beam columns andthe central beam column, and the cross-sectional radius of the supporting beam columns and the cross-sectional radius of the central beam column are both R; the structural units are arrayed to form the porous stent. The invention also provides a preparation method of the porous stent for bone repair. The porous stent has the advantages of high porosity, low elasticity modulus, high bearing capacity and the like.

Description

technical field [0001] The invention relates to the technical field of medical device design, in particular to a porous bracket for bone repair and a preparation method thereof. Background technique [0002] Implant repair is the most advantageous repair method in the repair of large-area bone defects caused by trauma or disease. For example, in a comminuted fracture of the femur, the required implant needs to have a low elastic modulus to match the autogenous bone to prevent stress shielding, and at the same time have a certain bearing capacity to prevent the implant from breaking. Metal porous implants can meet the above requirements and have good biocompatibility. [0003] Among existing products, titanium alloy implants have absolute advantages because of their excellent mechanical compatibility and biological compatibility. The elastic modulus of titanium alloy is closer to that of natural bone tissue than other metals, and there are no or few pathogenic elements in t...

AI Technical Summary

Problems solved by technology

The structure described in the Chinese patent CN 107847327 A publication is a regular tetrahedral diamond lattice structure, but its structure is relatively complex, the edge length is long, and the strength is low, which cannot meet the two-way requirements of porosity and strength at the same time

The unit structure described in the Chinese patent CN107174382 A is a body-centered cubic lattice structure, and the specific strength value is not indicated in the patent. Referring to its design method, after comparison of tests, it is found that its strength is only 39.04MPa, which is far lower than that of Natural bone tissue compressive strength 100-230MPa

The porous scaffold described in Chinese patent CN108601662 A is an irregular structure. Although the structure is closer to the structure of human bone tissue, the design process is relatively complicated and time-consuming, which is not conducive to time control in traumatic bone repair.

The mechanical properties of the above-mentioned structural unit scaffolds can match the natural bone tissue within a certain range to achieve the purpose of promoting bone growth, but the longer rib length leads to lower overall structural strength and insufficient bearing capacity, thereby limiting the growth microenvironment of bone cells. Affects bone tissue integration

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