Multiple-Fulcrum Surgical Cutter for High-Force Rod Cutting
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Solution Overview
Problem
Surgical cutters face difficulties in cutting stronger and stiffer materials due to insufficient leverage and mechanical advantage, making it challenging to modify or shape surgical fixation components effectively.
Innovation Solution
The design incorporates multiple sets of lever arms and leverage arrangements to increase the force applied to the material being cut, while reducing the size, bulk, and complexity of the device, allowing for various configurations and positions of the cutting mechanism without significant disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple sets of lever arms are added to increase mechanical advantage, then the force applied to the material being cut is increased, but the device complexity increases
Solution Approach 1:
The patent implements nested lever arms where inner lever arms are positioned within outer lever arms, creating a compact multi-stage mechanical advantage system. This nesting allows multiple lever arms to be integrated in a space-efficient manner, increasing cutting force while minimizing the increase in device complexity and overall size.
2Force
If the cutter length is increased to provide greater mechanical advantage, then the leverage is improved, but the overall device size and bulk increase
Solution Approach 1:
The nested lever arm configuration allows the system to achieve extended effective leverage without proportionally increasing the physical device length. By nesting lever arms within each other, the mechanical advantage is multiplied while the overall device footprint remains compact.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of lever arms at different angles and positions, allowing mechanical advantage to be achieved through spatial configuration rather than simply extending the linear length of the device. This dimensional approach enables compact design with high leverage.
3Adaptability or versatility
If the cutting mechanism is repositioned to extend outward from the device, then versatility of positioning is improved, but the device bulk increases
Solution Approach 1:
The patent implements adjustable and reconfigurable lever arm configurations that can be dynamically positioned in multiple orientations. This dynamic capability allows the cutting mechanism to be positioned in various configurations (extended outward, between handles, at different angles) without requiring multiple separate devices, thereby achieving versatility without proportionally increasing device bulk.
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 approach provides a significant mechanical advantage, enabling easier cutting of stronger materials with reduced user effort and allowing for versatile positioning of the cutting mechanism, improving the efficiency and effectiveness of surgical cutting tools.
Implementation Method 1
incorporates multiple sets of lever arms and/or other leverage arrangements to desirably increase the amount of force applied to the material being cut
Data Source
AI summary
Disclosed are devices, systems and methods for modifying, cutting and/or shaping surgical fixation components of various configurations, including spinal fixation rods and related components.