Bone Particle Slurry for Vertebral Stabilization
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Solution Overview
Problem
Current treatments for osteoporotic compression fractures, such as vertebroplasty and kyphoplasty, using PMMA bone cement can cause complications like avascular necrosis, adjacent segment fractures, and limited bone healing due to its exothermic reaction and foreign body response, while also being contraindicated in certain thoracic and lumbar fractures.
Innovation Solution
A surgical kit and method involving a cannula, catheter, and slurry pump to inject a pressurized slurry of cortical or cancellous bone particles into the vertebral body, allowing natural bone healing and increasing density without the use of PMMA, which includes a slurry comprising 30% to 85% bone by mass with specific particle size distribution for structural support and visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PMMA bone cement is used in vertebroplasty or kyphoplasty, then rigid support and pain relief are achieved, but complications such as avascular necrosis, adjacent segment fractures, and limited bone healing occur due to exothermic reaction and foreign body response
Solution Approach 1:
The invention changes the material parameter from PMMA bone cement to autologous bone graft particles, fundamentally altering the chemical and biological properties. This substitution eliminates the exothermic reaction and foreign body response while maintaining structural support capabilities through the mechanical properties of bone particles themselves
Solution Approach 2:
By using autologous bone graft particles, the patient's own bone material serves the dual function of providing immediate structural support and stimulating long-term bone healing. The bone particles act as both the filling material and the biological stimulus for regeneration, eliminating the need for separate healing processes
2Strength
If PMMA bone cement is injected into the vertebral body, then immediate structural stabilization is achieved, but cord compression from ectopic cement extension and extrusion through the cartilaginous endplate may occur
Solution Approach 1:
The invention changes the material parameter from PMMA bone cement to autologous bone graft particles, fundamentally altering the chemical and biological properties. This substitution eliminates the exothermic reaction and foreign body response while maintaining structural support capabilities through the mechanical properties of bone particles themselves
Solution Approach 2:
By using autologous bone graft particles, the patient's own bone material serves the dual function of providing immediate structural support and stimulating long-term bone healing. The bone particles act as both the filling material and the biological stimulus for regeneration, eliminating the need for separate healing processes
3Strength
If high density PMMA cement is placed in the vertebral body, then rigid support is provided, but adjacent segment microfracturing and later compression fractures occur due to density mismatch
Solution Approach 1:
The invention changes the material parameter from PMMA bone cement to autologous bone graft particles, fundamentally altering the chemical and biological properties. This substitution eliminates the exothermic reaction and foreign body response while maintaining structural support capabilities through the mechanical properties of bone particles themselves
Solution Approach 2:
By using autologous bone graft particles, the invention creates a homogeneous material environment within the vertebral body. The bone particles match the density and mechanical properties of the surrounding native bone, eliminating the density mismatch that causes stress concentration and adjacent segment fractures
4Strength
If vertebroplasty or kyphoplasty is performed to treat osteoporotic compression fractures, then pain is decreased and fracture is stabilized, but the procedure does not allow new bone growth and may cause adjacent segment collapse
Solution Approach 1:
The invention changes the material parameter from PMMA bone cement to autologous bone graft particles, fundamentally altering the chemical and biological properties. This substitution eliminates the exothermic reaction and foreign body response while maintaining structural support capabilities through the mechanical properties of bone particles themselves
Solution Approach 2:
By using autologous bone graft particles, the patient's own bone material serves the dual function of providing immediate structural support and stimulating long-term bone healing. The bone particles act as both the filling material and the biological stimulus for regeneration, eliminating the need for separate healing processes
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 enables gradual bone density increase, stabilization of fractures, and potential healing of vertebral bodies, reducing the risk of complications associated with PMMA, and can be used in both stable and unstable fractures, including those contraindicated for traditional vertebroplasty or kyphoplasty, with visualization under imaging techniques.
Implementation Method 1
The slurry is pressurized during and/or after the injecting to force bone particles of the slurry into direct contact with bone tissue inside the vertebral body
Data Source
AI summary
A medical implant comprises a slurry of bone particles that are injected into a vertebral body under pressure. The liquid component of the slurry may be aspirated while the slurry is being injected so that the bone particles of the slurry pack into the central area of the vertebral body to provide structural support. The injected slurry may be agitated during the procedure to maximize the structural strength of the implant after the procedure.