Compound Hinged Rod Bender Mechanical Advantage
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Solution Overview
Problem
Existing devices for bending spinal rods and plates lack the precision and ease of use required for accurate pre-insertion modification to accommodate individual spinal anatomy, making it difficult for surgeons to stabilize vertebrae effectively.
Innovation Solution
A compound rod bender with a system of pivot points and handle arms, featuring rotatable rolling elements and a barrel with varying bending surfaces, allows for precise and efficient bending of spinal rods by distributing the force required for contouring, utilizing a compound hinge mechanism to increase mechanical advantage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rod bending devices are used, then the device structure is simple, but the bending precision and ease of operation deteriorate
Solution Approach 1:
The device is divided into multiple functional segments: handle arms for force application, pivot points for motion control, rolling elements for rod engagement, and a barrel for bending support. This segmentation allows each component to perform its specific function efficiently, achieving precise bending control.
Solution Approach 2:
The device incorporates multiple pivot points that create a dynamic compound hinge mechanism, allowing the handle arms to move through controlled arcs during operation. This dynamic motion distribution enables precise force application and rod contouring while maintaining operational ease.
2Ease of operation
If traditional rod bending devices are used, then the device structure is simple, but the ease of operation deteriorates
Solution Approach 1:
The compound hinge mechanism with multiple pivot points creates a dynamic system that distributes the bending force required across different motion arcs. This allows the surgeon to apply force more easily through the handle arms while the mechanism translates this into precise rod bending.
Solution Approach 2:
The rolling elements act as intermediaries between the handle arms and the rod, providing controlled engagement and reducing friction. The barrel serves as an intermediary support surface that guides the bending process, making operation easier while maintaining precision.
3Manufacturing precision
If traditional rod bending devices are used, then the force requirement is high, but the bending precision deteriorates
Solution Approach 1:
The dynamic compound hinge mechanism distributes the required bending force across multiple pivot points and motion arcs, reducing the peak force requirement while maintaining control precision throughout the bending process.
Solution Approach 2:
The rolling elements and barrel serve as intermediaries that distribute and manage the force application to the rod, reducing the direct force requirement from the surgeon while achieving precise bending through the mechanical advantage of the compound hinge system.
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 surgeons to easily and accurately bend spinal rods with reduced force requirement, accommodating different rod sizes and bend severities, thereby enhancing the precision and efficiency of spinal stabilization procedures.
Implementation Method 1
first and second rolling elements which are coupled to the distal ends of the first and second distal arms
Implementation Method 2
compound hinge mechanism to increase mechanical advantage
Data Source
AI summary
A compound rod bender includes a first distal arm, a second distal arm, a rotating and translating barrel, and a compound hinge. The barrel includes a plurality of bending surfaces configured to be selectively positioned to contour a rod. The barrel is positioned on a pivot point between the first and second distal arms. The compound hinge includes at least one additional pivot point configured to increase a bending force when the rod is contoured.