Computer-Assisted Joint Distraction for Soft Tissue Balance
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Solution Overview
Problem
Current joint replacement surgery techniques, particularly in total knee arthroplasty, face challenges in achieving consistent soft tissue tension and balance due to subjective assessment methods and the reliance on manual instrumentation, leading to variable outcomes and potential surgical failure.
Innovation Solution
An orthopedic distraction device with upper and lower paddles and a displacement mechanism, controlled by a drive assembly and a controller, which applies varying displacement forces based on joint angle and position to achieve precise soft tissue tension and balance, aided by a computer-assisted system for planning and tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual instrumentation and subjective assessment methods are used for soft tissue tensioning, then the surgeon can perform the procedure with simple tools, but the assessment of soft tissue tension varies depending on the surgeon and yields inconsistent results
Solution Approach 1:
The patent replaces manual mechanical assessment with a robotic system that uses sensors and computer control to objectively measure and apply forces to the joint. The robotic arm with force sensors substitutes the surgeon's manual instrumentation, providing precise, quantifiable measurements of soft tissue tension while eliminating subjective variability.
Solution Approach 2:
The robotic system performs self-assessment and self-adjustment of soft tissue tension through automated sensing and control. The system independently measures forces, calculates appropriate corrections, and applies adjustments without requiring subjective surgeon intervention, thereby achieving consistent results across different operators.
2Adaptability or versatility
If multiple instruments and provisional trial components are used to address soft tissue tensioning, then the system can accommodate various surgical scenarios, but the number of instruments required in the operating room increases
Solution Approach 1:
The robotic system serves multiple functions through a single integrated platform: it measures soft tissue tension, calculates appropriate adjustments, applies corrective forces, and adapts to different joint types and surgical scenarios. This multi-functional capability replaces the need for multiple specialized instruments and trial components while maintaining versatility across various surgical applications.
Solution Approach 2:
The robotic system dynamically adapts to different surgical scenarios through real-time sensing and control adjustment. Rather than requiring different static instruments for different situations, the system modifies its behavior and parameters on-the-fly to accommodate various joint anatomies, pathologies, and surgical goals, providing versatility through dynamic reconfiguration.
3Measurement precision
If robotic and computer-assisted surgery systems are introduced to improve soft tissue tensioning, then measurement and control precision improve, but the device complexity and cost increase
Solution Approach 1:
The patent employs robotic arms with integrated force sensors and computer control systems to replace manual mechanical assessment and adjustment. This substitution provides precise, automated measurement and control of soft tissue tension, achieving superior measurement accuracy while managing system complexity through integration and automation.
Data Source
AI summary
An orthopedic distraction device is provided. The orthopedic distraction device includes a first upper paddle for engaging a first bone of a joint, a lower paddle for engaging a second bone of the joint and a displacement mechanism. The displacement mechanism includes a drive assembly operable to move the upper paddle relative to the lower paddle. The lower paddle is releasably connected to the displacement mechanism.