3D-Printed Composite Bone Grafts for Strength and Osteoinduction
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Solution Overview
Problem
Current methods for producing custom bone grafts lack a material that is both biocompatible and capable of osteoinduction, providing adequate load-bearing strength while being resorbable, and are not easily adaptable to specific surgical needs.
Innovation Solution
A method using 3-D printing to create custom bone grafts from a porous, biodegradable material infused with Bone Morphogenetic Proteins (BMPs), such as demineralized allograft bone matrix (DBM) and Poly Methyl Methacrylate (PMMA), which can be tailored to specific shapes and sizes using a 3-D printer, ensuring compatibility and strength comparable to natural bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If demineralized bone matrix (DBM) is used as graft material, then osteoinduction capability is improved, but load-bearing strength deteriorates
Solution Approach 1:
The patent combines demineralized bone matrix (DBM) particles with a biodegradable polymer matrix (such as poly-L-lactic acid or polycaprolactone) to create a composite bone graft material. The DBM provides osteoinduction capability while the polymer matrix provides structural support and load-bearing strength, resolving the contradiction between biological activity and mechanical strength.
2Adaptability or versatility
If custom-shaped bone grafts are produced using traditional methods, then adaptability to surgical needs is improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent uses computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies to digitally model and fabricate custom-shaped bone grafts. By changing the manufacturing approach from traditional surgical shaping to additive manufacturing or CNC milling, the system achieves high adaptability to patient-specific anatomy while reducing manual manufacturing complexity and surgical time.
3Duration of action of stationary object
If bone graft material is made biodegradable, then resorbability by body is improved, but structural stability deteriorates
Solution Approach 1:
The patent creates a biodegradable polymer matrix with controlled porosity and degradation rate. The matrix is designed to maintain structural stability in the short term to support the graft, while gradually degrading over time as new bone forms. The local quality of the material allows different regions to have different degradation characteristics, ensuring both initial stability and eventual resorbability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the production of custom bone grafts that integrate well with the body, promote bone regeneration, and can be precisely shaped to fit specific surgical requirements, enhancing the chances of successful bone graft maturation and healing.
Implementation Method 1
Osteoinduction allows bone formation to be induced even at non-skeletal sites and is initiated by bone morphogenetic proteins (BMP)
Implementation Method 2
The present invention provides a system and method of producing custom bone grafts that are made of a porous, biocompatible material infused with BMPs that can be used as ink in a 3-D printer to produce bone grafts of any desired shape
Implementation Method 3
The ideal bone graft material would be a strong, porous biocompatible material infused with BMP
Data Source
AI summary
A method for producing bone grafts using 3-D printing is employed using a 3-D image of a graft location to produce a 3-D model of the graft. This is printed using a 3-D printer and a printing medium that produces a porous, biocompatible, biodegradable material that is conducive to osteoinduction. For example, the printing medium may be PCL, PLLA, PGLA, or another approved biocompatible polymer. In addition such a method may be useful for cosmetic surgeries, reconstructive surgeries, and various techniques required by such procedures. Once the graft is placed, natural bone gradually replaces the graft.