3D Printed Bone Scaffold with Dual Modulus for Segmental Defects
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Solution Overview
Problem
Current bone grafting methods face challenges such as immunological issues, infection risks, and mechanical instability, particularly in large bone deficiencies, where traditional scaffolds lack sufficient mechanical support and nutrient flow, leading to suboptimal healing outcomes.
Innovation Solution
A bone repair scaffold with an inner and outer core of varying porosity and modulus, fabricated using 3D printing with biocompatible polylactic acid, mimicking the internal architecture of bone, including horizontal and vertical conduits to provide mechanical stability and promote nutrient exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bone grafting methods (autograft or allograft) are used, then bone repair can be achieved, but immunological issues, infection risks, and mechanical instability occur
Solution Approach 1:
The patent uses biodegradable polymers that temporarily provide mechanical support and then degrade as native bone regenerates, eliminating the need for permanent implants and reducing long-term complications. The scaffold is designed to be temporary, serving its purpose during the healing period and then being resorbed by the body.
Solution Approach 2:
The scaffold employs a porous structure with controlled pore size and interconnectivity to enable nutrient transport, cell migration, and vascular infiltration. This porous architecture mimics natural bone tissue and facilitates biological integration while maintaining mechanical integrity during the healing process.
2Reliability
If tissue-engineered scaffolds are used to enhance healing response, then bone regeneration is promoted, but insufficient mechanical support is provided
Solution Approach 1:
The scaffold employs a gradient structure with varying porosity and mechanical properties across different regions. The outer cortex region has lower porosity for mechanical strength, while the inner medullary region has higher porosity for cell infiltration and nutrient transport, mimicking the natural bone structure and providing both strength and biological functionality.
Solution Approach 2:
The patent uses composite material structures combining different polymer phases or material combinations to achieve both mechanical strength and biological functionality. The scaffold integrates load-bearing structural components with porous regions optimized for tissue ingrowth, creating a multi-functional composite structure.
3Ease of manufacture
If traditional fabrication methods are used for scaffolds, then manufacturing is simplified, but control over internal architecture is inhibited
Solution Approach 1:
The patent utilizes 3D printing technology to precisely control fabrication parameters such as pore size, porosity, strut thickness, and interconnectivity. By adjusting printing parameters like layer height, infill density, and support structures, the scaffold's internal architecture can be optimized for both mechanical performance and biological functionality with high manufacturing precision.
4Reliability
If scaffolds with high porosity are used to allow nutrient flow, then tissue vascularization is promoted, but mechanical stability is reduced
Solution Approach 1:
The scaffold employs a gradient structure with varying porosity and mechanical properties across different regions. The outer cortex region has lower porosity for mechanical strength, while the inner medullary region has higher porosity for cell infiltration and nutrient transport, mimicking the natural bone structure and providing both strength and biological functionality.
Solution Approach 2:
The scaffold is divided into distinct functional regions: an outer cortical shell providing mechanical strength and an inner trabecular core providing high porosity for nutrient exchange. This segmentation allows each region to be optimized for its specific function while working together as an integrated structure.
Data Source
AI summary
A bone repair scaffold having two moduli that match those of the cancellous and cortical bone in a patient receiving a bone graft/implant. The bone repair scaffold possesses increased mechanical properties to sustain physiological loading and biologically active capability to facilitate bone fusion. The bone repair scaffold may be 3D-printed, which allows for a variety of scaffold designs and configurations. Pore size, interconnected porosity, shape, and modulus of the bone repair scaffold may be modified for different bone graft applications, whether it is used as filler for bone cancer resections or trauma, or as a fusion device in cases of surgery. Depending on the defect location of the bone shaft, the relative porosity of the scaffold may be modified to account for changes in cortical bone thickness. A method for treating a bone defect using the bone repair scaffold is also disclosed.