Bone Regeneration Scaffold With Dynamic Load Transfer
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Solution Overview
Problem
Conventional artificial scaffolds for bone regeneration face challenges in maintaining rigidity during the bone healing process and transferring loads to the regenerated bone without applying undue stress to the scaffold once the bone has regained sufficient strength.
Innovation Solution
A scaffold design featuring a main support member and a load supporting unit with bent supporting pieces that can be fixed to both compact and spongy bone areas, allowing for load distribution and transfer, with a mechanism to decouple the load transfer once the bone has regained sufficient rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional artificial scaffold is implanted to maintain rigidity during bone regeneration, then the scaffold provides sufficient structural support, but the scaffold continues to bear load after bone regeneration preventing the regenerated bone from gaining sufficient rigidity
Solution Approach 1:
The scaffold incorporates a dynamic load transfer mechanism that automatically adjusts load distribution between the scaffold and regenerated bone. The bent supporting pieces with contact portions allow the scaffold to bear load during early regeneration, then progressively transfer load to the regenerated bone as it gains strength, eliminating the need for manual intervention or removal
Solution Approach 2:
The scaffold utilizes changes in mechanical parameters over time through its bent supporting piece structure. The contact portion geometry and bending characteristics enable the scaffold to exhibit different load-bearing behaviors at different stages of bone regeneration, providing high rigidity initially and gradually transitioning to load transfer as bone strength increases
2Stability of the object's composition
If the scaffold maintains rigidity throughout the regeneration period, then structural support is ensured, but the regenerated bone cannot receive necessary load stimulation to develop sufficient strength
Solution Approach 1:
The bent supporting pieces create a dynamic system where load distribution automatically adjusts based on the relative stiffness of the scaffold and regenerated bone. As the bone regains strength, the load naturally shifts from the more compliant scaffold portions to the stiffer regenerated bone, providing necessary mechanical stimulation without compromising initial structural stability
3Device complexity
If a simple straight supporting piece is used, then the structure is simple and easy to manufacture, but it cannot effectively distribute load between compact bone and spongy bone regions
Solution Approach 1:
The supporting piece is segmented into distinct functional regions: a contact portion for compact bone engagement, bent sections for load distribution, and extensions for spongy bone region support. This segmentation allows each portion to optimize its function while maintaining overall structural efficiency
Solution Approach 2:
The bent supporting piece incorporates curved geometries that follow the natural contours of the bone defect site. The bending allows the supporting piece to conform to the complex three-dimensional structure of compact and spongy bone interfaces, maximizing contact area and load distribution effectiveness
Data Source
AI summary
There is provided a scaffold for bone regeneration which is adapted to be implanted at a bone defect site of a bone. The scaffold comprises a main support member configured to be fixed to the bone, and a load supporting unit configured to be installed in the bone defect site of the bone to selectively bear a load applied to the bone. The load supporting unit includes one or two supporting pieces to be installed in the bone defect site of the bone to selectively bear a load applied to the bone. The supporting piece has at one end portion a contact portion to be brought into contact with and fixed to a compact bone in the bone defect site of the bone. The other end portion of the supporting piece is selectively coupled to the main support member.