Natural Allograft Intervertebral Disk Preservation
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Solution Overview
Problem
Current treatments for degenerative disk disease, such as spinal fusion, lead to long-term complications like adjacent-segment degeneration, and artificial disk replacements face issues with implant fixation, biocompatibility, and maintaining natural biomechanical function, resulting in prosthesis loosening and revision surgery needs.
Innovation Solution
A method involving the harvesting and processing of a natural allograft intervertebral disk unit from a human donor, including the nucleus pulposus, annulus fibrosis, extracellular matrix, and endplates, which is then transplanted into the patient, with optional cell and scaffold augmentation to restore disk function and reduce pain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If spinal fusion is performed to obtain mechanical support and stability, then stability is improved, but adjacent-segment degeneration occurs
Solution Approach 1:
The invention divides the treatment approach into two parts: (1) performing spinal fusion only when absolutely necessary for stability, and (2) preserving or replacing only the specific degenerated disk while maintaining mobility in adjacent segments. This selective approach avoids the harmful effect of rigid instrumentation on adjacent segments while still providing needed stability.
Solution Approach 2:
The invention changes the biomechanical parameters of the spinal construct by using biologic materials (allograft disks, bone morphogenetic proteins) that allow for physiological movement and loading, rather than rigid fixation. This creates a more natural stress distribution that prevents adjacent-segment degeneration while maintaining spinal stability.
2Ease of operation
If artificial disk replacement is performed to preserve mobility, then mobility is maintained, but implant fixation and biocompatibility issues arise
Solution Approach 1:
The invention uses biologic materials (autografts, allografts, and bone morphogenetic proteins) that have the inherent ability to integrate with host bone through biological processes such as osteogenesis and osteoinduction. The implant essentially 'services itself' by stimulating the host's own bone-forming cells to create secure fixation, eliminating the need for complex mechanical fixation systems.
Solution Approach 2:
The invention employs composite biologic constructs combining allograft disk tissue with bone morphogenetic proteins and potentially other biologic agents. This composite approach leverages the structural properties of the allograft disk while adding the osteoinductive properties of BMPs, creating a material system that simultaneously addresses mobility preservation and reliable fixation.
3Ease of operation
If total disk replacement with artificial prosthesis is performed, then disk function is replaced, but prosthesis loosening and revision surgery are required
Solution Approach 1:
The biologic allograft disk construct continuously integrates with the host through ongoing biological processes. Bone morphogenetic proteins stimulate persistent osteogenesis at the host-allograft interface, creating a dynamic, self-reinforcing fixation that improves over time rather than degrading, thereby extending prosthesis longevity without requiring revision surgery.
Solution Approach 2:
The invention performs preliminary biological preparation by implanting bone morphogenetic proteins and osteoinductive factors before final structural integration occurs. This preliminary biologic activation prepares the host bone and interface tissues to rapidly and securely incorporate the allograft disk, establishing a strong foundation that prevents future loosening and eliminates the need for revision procedures.
Data Source
AI summary
A natural spinal disk including adjacent vertebral structures is removed from a deceased donor, rinsed in normal saline, preserved in a cryopreservative solution, and then frozen by gradually decreasing the temperature using liquid nitrogen or similar method. The implant may be thawed in normal saline solution and then implanted in a patient in need of a vertebral disk replacement.