Resorbable Calcium Cement for Osteoporotic Vertebrae
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Solution Overview
Problem
Current treatments for osteoporotic vertebral compression fractures, such as vertebroplasty and kyphoplasty, often lead to complications like adjacent vertebral fractures due to the rigidity of PMMA bone cement, and there is a need for a prophylactic treatment to prevent fractures in osteoporotic patients before they occur.
Innovation Solution
A minimally invasive method involving the injection of a biocompatible, resorbable calcium-based cement paste into osteoporotic vertebrae, which hardens and is gradually replaced by new bone growth, using a delivery system that prevents powder-liquid separation and is suitable for non-fractured vertebrae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PMMA bone cement is injected into osteoporotic vertebrae to provide mechanical support, then the strength and stability of the vertebra are improved, but the risk of adjacent vertebral fractures increases due to the rigidity of PMMA
Solution Approach 1:
The patent changes the material parameter from rigid PMMA to flexible calcium-based cement with different mechanical properties. The calcium-based cement has lower rigidity and can deform with bone movement, reducing stress concentration on adjacent vertebrae while still providing sufficient mechanical support to treat osteoporotic vertebrae
Solution Approach 2:
The patent uses composite material strategy by combining calcium-based cement with bone grafting materials. The calcium-based cement provides initial mechanical support and stability, while the bone grafting materials provide osteoconductive scaffold for new bone growth, creating a composite structure that balances strength and flexibility
2Reliability
If PMMA bone cement is used to stabilize fractured vertebrae, then the fracture fixation is achieved, but the biocompatibility is reduced due to non-resorbable nature of PMMA
Solution Approach 1:
The patent applies the principle of temporary support by using calcium-based cement that is resorbable over time. The cement provides temporary mechanical support during the critical healing period, then gradually degrades as new bone forms, ultimately being completely replaced by biological tissue. This eliminates the long-term biocompatibility issues of permanent PMMA implants
Solution Approach 2:
The calcium-based cement serves as a temporary scaffold that is discarded (resorbed) once its function is fulfilled. As the cement degrades, it is recovered by the body's natural bone remodeling process, with osteoblasts forming new bone tissue in its place. This cyclic process of degradation and regeneration improves biocompatibility while maintaining fracture fixation
3Reliability
If calcium-based cement paste is injected into non-fractured osteoporotic vertebrae for prophylactic treatment, then the prevention of subsequent fractures is achieved, but the mechanical support may be insufficient compared to PMMA
Solution Approach 1:
The patent applies preliminary action by injecting calcium-based cement into non-fractured osteoporotic vertebrae before fractures occur. This prophylactic treatment strengthens the bone structure in advance, creating mechanical support and stability before the bone fails. The cement hardens to provide immediate structural reinforcement, preventing future compression fractures
Solution Approach 2:
For prophylactic treatment, the patent uses composite material approach by combining calcium-based cement with bone grafting materials in specific ratios. The calcium-based cement provides initial mechanical strength and stability, while the bone grafting materials provide osteoinductive and osteoconductive properties to stimulate new bone formation, creating a synergistic effect that enhances both immediate strength and long-term bone quality
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
This approach reduces the risk of subsequent fractures by providing mechanical support and stimulating bone growth, addressing the limitations of existing treatments by using a more biocompatible and resorbable material that is less likely to cause complications.
Implementation Method 1
injecting a calcium-based cement paste into said osteoporotic vertebra, wherein the injected calcium-based cement paste will harden in said osteoporotic vertebra to form a hardened block
Implementation Method 2
at least a portion of the hardened block is bioresorbable and will be gradually replaced by a newly-grown bone structure in said osteoporotic vertebra
Data Source
AI summary
A percutaneous minimally-invasive procedure to prevent a potential fracture in an osteoporotic vertebra of an osteoporotic patient who has no history of vertebral fracture is provided by minimally-invasively injecting a non-dispersive, biocompatible and resorbable calcium-based cement paste into the osteoporotic vertebral body.