Leaf-Spring Joint Distractor for Tight-Space Tension Measurement
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Solution Overview
Problem
Existing joint distraction tensors for orthopedic procedures face challenges in tight joint spaces due to their thickness and the need for load sensors, which complicate insertion and accurate load measurement.
Innovation Solution
A joint distractor with a flexible, thin-profile design and a leaf spring mechanism that forms an arch for distraction, allowing easy insertion and precise load measurement using integrated load sensors or mechanical deflection members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the paddle thickness is increased to prevent plastic deformation under load, then the structural strength is improved, but the ease of insertion into tight joint spaces deteriorates
Solution Approach 1:
The paddle transitions from a rigid thick structure to a flexible thin structure that can dynamically adapt its shape. The paddle is configured to deflect under load rather than requiring excessive thickness for rigidity, enabling easy insertion while maintaining strength through elastic deformation capability
Solution Approach 2:
The paddle material properties are changed to allow flexible deformation. By selecting materials with appropriate elastic properties, the paddle can temporarily deform during insertion and then maintain structural integrity when loaded, resolving the contradiction between thickness and strength
2Measurement precision
If load sensors are added to provide real-time ligament tension measurement, then the measurement precision is improved, but the device complexity and paddle size increase
Solution Approach 1:
The load sensing functionality is merged with the paddle structure itself. The paddle is designed so that its deflection directly indicates ligament tension, eliminating the need for separate sensor components and reducing overall device complexity while maintaining measurement capability
Solution Approach 2:
Complex electronic load sensors are replaced with a simplified mechanical deflection-based indication system. The paddle's physical deformation serves as the measurement mechanism, reducing device complexity while providing sufficient measurement precision for clinical use
3Reliability
If the paddle thickness is increased to accommodate load sensors and ensure proper load path alignment, then the measurement reliability is improved, but the ease of operation in tight joint spaces deteriorates
Solution Approach 1:
The paddle is designed as a flexible component that dynamically deflects under load to provide measurement indication. This dynamic behavior ensures reliable load path alignment through the paddle material itself, eliminating the need for thick rigid structures or separate sensors, thereby maintaining both reliability and ease of insertion
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
Enables efficient joint distraction with improved insertion capability and accurate load sensing, facilitating procedures like total knee arthroplasty by maintaining a low profile and providing reliable force measurement.
Implementation Method 1
The first surface may be a spring. The spring may be a leaf spring disposed in a housing at a distal end of the joint distractor. The leaf spring may be in an unstressed condition in the first position and a stressed condition in the second position.
Data Source
AI summary
Disclosed herein are a joint distractor for joint distraction and a method for utilizing the same in a joint distraction procedure. The joint distractor may include a first surface and a second surface. The first surface may contact a first bone of a joint and the second surface may contact a second bone of a joint. The first surface may be a flexible surface that is substantially parallel to the second surface in a first position and forms an arch in a second position to distract the first bone from the second bone. A method for distracting a joint may utilize the first and second surfaces of the joint distractor.