Multi-Axis Joint Stabilizer for Carpometacarpal Alignment
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Solution Overview
Problem
Existing joint stabilization devices are inadequate for joints with multiple axes of rotation, such as the carpometacarpal joint, as they fail to maintain proper alignment and allow for natural motion, leading to chronic instability and potential irreversible damage.
Innovation Solution
A multi-axis internal joint stabilizer comprising two axle portions aligned with the joint's axes of rotation, connected by a body portion to maintain correct spatial alignment, which can be implemented as a single or multi-part device, made from bio-compatible materials like titanium or shape memory alloys, facilitating early joint movement and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-axis stabilization device is used, then the device structure is simple, but it cannot maintain proper alignment in multi-axis joints
Solution Approach 1:
The stabilizer is divided into multiple axle portions (first axle portion and second axle portion) that align with different axes of rotation of the joint. Each axle portion independently stabilizes motion along its respective axis, allowing the device to handle complex multi-axis joint mechanics while maintaining manageable structural complexity
Solution Approach 2:
The invention transitions from single-axis stabilization to multi-axis stabilization by adding spatial dimensions to the stabilizer structure. The axles are positioned at specific angles relative to each other to match the joint's natural axes of rotation, enabling stabilization in three-dimensional space
2Reliability
If a multi-axis stabilizer with multiple axles is used, then joint alignment is maintained, but the device complexity increases
Solution Approach 1:
Multiple axle portions are merged into a single integrated stabilizer device with a common body portion. This unified structure reduces the number of separate components that would need to be assembled and positioned, thereby managing device complexity while maintaining multi-axis alignment capabilities
3Reliability
If immobilization is applied to maintain reduction, then joint stability is improved, but joint motion is restricted leading to ankylosis
Solution Approach 1:
The stabilizer dynamically adapts to the joint's natural motion by providing stabilization along the joint's axes of rotation while permitting motion along those same axes. This dynamic approach allows the joint to move naturally during healing rather than imposing rigid fixed-position immobilization
Solution Approach 2:
The stabilizer acts as an intermediary between the bone fragments, providing controlled stabilization that permits physiological motion. It mediates between the need for stability (to maintain reduction) and the need for motion (to prevent ankylosis) by allowing movement along the joint's natural axes while preventing pathological displacement
Data Source
AI summary
An internal device is provided for stabilizing a joint having multiple axes of rotation. The device includes two axles, separated by a body portion. The two axles are maintained by the body portion in a geometric relationship that replicates the geometric relationship of the rotational axes of the joint. The axles are installed into the bones of the joint to stabilize the joint.