Fenestrated Spinal Attachment Device with Pressure Reduction Mechanism
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Solution Overview
Problem
Current fenestrated attachment devices for bone stabilization in the spine have unpredictable anchoring strengths due to uncontrolled cement flow during implantation, which affects the stability and reliability of bone fixation, especially in osteoporotic bones.
Innovation Solution
The development of fenestrated attachment devices with a pressure reduction mechanism that includes a pressure reduction device with a lateral fenestration, allowing for controlled flow of bone cement through the device, reducing pressure and ensuring consistent anchoring force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bone cement is pressurized into the attachment device lumen to increase anchor strength, then anchoring force improves, but cement flow becomes uncontrolled leading to unpredictable anchoring strength
Solution Approach 1:
The patent changes the physical parameters of the cement delivery system by incorporating a pressure reduction device with specific fenestration geometry. The device includes a first fenestration with a larger cross-sectional area and a second fenestration with a smaller cross-sectional area, creating a controlled pressure gradient that regulates cement flow rate and distribution. This parameter control ensures predictable anchoring strength while maintaining high anchor force.
Solution Approach 2:
The pressure reduction device acts as an intermediary component between the cement source and the bone tissue. It mediates the cement flow by reducing pressure and controlling distribution through its fenestrations, preventing direct uncontrolled injection into the bone while still delivering sufficient cement for reliable anchoring.
2Strength
If cement flow is increased to improve anchoring in osteoporotic bone, then anchor strength improves, but cement distribution becomes non-uniform
Solution Approach 1:
The pressure reduction device incorporates fenestrations with different cross-sectional areas to create local quality variations in cement flow. The first fenestration with larger area allows higher flow rates for initial cement delivery, while the second fenestration with smaller area provides controlled distribution to specific regions. This local differentiation ensures uniform cement distribution throughout the bone structure, particularly important for osteoporotic bone where uniform infiltration is critical for reliable anchoring.
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 solution provides more predictable and reliable anchoring forces, improving the stability and outcomes of bone fixation procedures by ensuring uniform cement distribution and increased anchor strength, regardless of bone health.
Implementation Method 1
The pressure of the bone cement can decrease when the bone cement passes through the pressure reduction first fenestration
Implementation Method 2
The attachment device can have an attachment device lumen and an attachment device first fenestration in fluid communication with the attachment device lumen and the target site
Data Source
AI summary
Attachment devices and methods of using the same are disclosed. The attachment devices can be fenestrated. The fenestrations can control the flow of fluid out of and/or into the device.