Medical Tool Adaptive Rotation via Drag Monitoring
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Solution Overview
Problem
Current dental and medical procedures using rotary tools face challenges in efficiently managing torque to prevent damage during single-direction and reciprocating rotations, lacking a system that can adaptively switch between these motions based on real-time conditions.
Innovation Solution
A method that allows the tool to coast after rotating in a single direction, determining drag parameters to decide whether to continue or reverse direction, ensuring adaptive rotation to prevent unwanted stress and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-direction rotation is used, then cutting efficiency is improved, but stress accumulation and tool damage risk increase
Solution Approach 1:
The system implements periodic reciprocating rotation where the tool alternates between forward and reverse directions. This periodic action allows the tool to relieve accumulated stress during reverse rotation while maintaining high cutting efficiency during forward rotation, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The system dynamically switches between single-direction and reciprocating rotation modes based on real-time torque conditions. When torque exceeds thresholds indicating stress accumulation, the system transitions to reciprocating mode to relieve stress, then returns to single-direction mode for efficient cutting, optimizing both productivity and reliability.
2Reliability
If reciprocating rotation is used, then tool stress is relieved and operator feel is improved, but cutting efficiency decreases
Solution Approach 1:
The system uses periodic reciprocating rotation rather than continuous reciprocating motion. The tool performs brief reverse rotations to relieve stress, then returns to efficient single-direction cutting. This periodic approach maintains stress relief benefits while minimizing the impact on overall cutting efficiency.
Solution Approach 2:
The system dynamically adapts between rotation modes based on stress levels. When stress accumulation is detected through torque monitoring, the system switches to reciprocating rotation for stress relief, then transitions back to single-direction rotation for efficient cutting, optimizing the balance between reliability and productivity.
3Productivity
If continuous motor power is applied, then cutting efficiency is maintained, but operator feel and stress monitoring capability are reduced
Solution Approach 1:
The system implements periodic coasting periods where motor power is temporarily removed, allowing the tool to coast while the operator maintains tactile feedback. This periodic interruption of continuous power maintains cutting efficiency over time while providing regular opportunities for stress assessment and operator feel.
Solution Approach 2:
The system dynamically controls motor power delivery, switching between continuous power application for efficient cutting and temporary power removal for coasting periods. This dynamic control allows the operator to maintain tactile feedback and assess stress conditions while preserving overall cutting efficiency through strategic power application.
Data Source
AI summary
A method for cutting with a tool comprises rotating the tool in a first direction. Then, at a predetermined moment, quit rotating the tool and allow the tool to coast in the first direction. While the tool coasts, a parameter is determined that represents drag experienced by the tool as the tool coasts. If the determined parameter does not exceed a predetermined limit then the tool is rotated in the first direction. If the determined parameter exceeds the predetermined limit, then the tool is rotated in another direction opposite the first direction. The predetermined moment when the tool begins to coast may be any desired moment, such as when the tool rotates through a specific distance or for a specific period of time.