Handheld Surgical Instrument Motor Limits for Driver-Specific Control
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Solution Overview
Problem
Current surgical instruments lack full control and customization over their functions, particularly in ultrasonic and electrosurgical procedures, leading to inefficiencies in tissue treatment.
Innovation Solution
A modular battery-powered handheld surgical instrument with a motor and controller system that selectively actuates drivers for different components, performing limiting operations based on specific conditions to optimize motor output and adapt to varying tissue types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single motor control limit is used for all drivers, then the device complexity is reduced, but the adaptability to different tissue types and surgical functions is limited
Solution Approach 1:
The motor control system dynamically adjusts limiting conditions based on which driver is actuated. The controller selectively applies different limiting conditions (first limiting condition for first driver, second limiting condition for second driver) depending on the operational mode, enabling adaptability without requiring a completely separate control system for each function.
Solution Approach 2:
The system changes control parameters (limiting conditions) based on the operational state. When the first driver is actuated, the first limiting condition is applied; when the second driver is actuated, the second limiting condition is applied. This parameter switching enables the same motor to adapt to different tissue types and surgical functions.
2Manufacturing precision
If variable motor control limits are implemented for different drivers, then precision and control are improved, but the device complexity increases
Solution Approach 1:
The control system is segmented into different limiting conditions for different drivers. The controller is configured to selectively apply the first limiting condition when the first driver is actuated and the second limiting condition when the second driver is actuated, allowing precision optimization for each function while maintaining a unified controller architecture.
Solution Approach 2:
A single motor and controller are designed to perform multiple functions with different control characteristics. The motor actuates both the first driver and second driver, and the controller universally manages both operations by selectively applying appropriate limiting conditions, achieving precision without requiring separate dedicated systems.
3Adaptability or versatility
If selective actuation of different drivers is enabled, then the versatility of the surgical instrument is improved, but the ease of operation becomes more complex
Solution Approach 1:
The controller automatically determines which limiting condition to apply based on which driver is actuated. The system self-manages the complexity by automatically switching between first and second limiting conditions without requiring the user to manually configure control parameters, maintaining ease of operation while enabling versatile functionality.
Data Source
AI summary
A surgical instrument is disclosed comprising a shaft assembly comprising a shaft, a housing coupled to a proximal end of the shaft, a button, a driver, a motor configured to actuate the driver, and a controller for translating displacement of the button to a velocity of the motor. The controller is configured to detect a displacement of the button, wherein the displacement is manifested as a frequency and magnitude over a period of time, compare the detected frequency to a frequency threshold, compare the detected magnitude with a magnitude threshold, determine that the detected frequency exceeds the frequency threshold and the detected magnitude exceeds the magnitude threshold, and smooth the velocity of the motor over the period of time based on determining the detected frequency exceeds frequency threshold and determining the detected magnitude exceeds the a magnitude threshold.