Surgical Device Motor Control via Stored Force Profiles
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Solution Overview
Problem
Current powered surgical devices lack effective control over retraction forces, which can lead to system damage or malfunction and prolonged surgical procedures due to the absence of feedback-based control during the retraction phase.
Innovation Solution
A powered handheld electromechanical surgical device equipped with a motor, sensor, and controller that uses force feedback from a strain gauge to control motor speed during extension and retraction, storing force and speed profiles to manage retraction forces without explicit feedback during this phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback-based control is implemented during retraction phase, then retraction forces are controlled and system damage is prevented, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The system determines speed and force profiles during the extension phase when feedback is available, and then applies these pre-determined profiles during retraction. This preliminary action during extension allows the retraction phase to proceed with controlled forces without requiring real-time feedback, thus improving reliability while avoiding the complexity of continuous feedback control during retraction.
Solution Approach 2:
The retraction phase copies the speed and force profiles that were determined during the extension phase. By replicating the controlled profile approach rather than implementing independent real-time control during retraction, the system achieves force control reliability without the full complexity of dual-phase feedback systems.
2Reliability
If real-time force feedback control is used during retraction, then system damage is prevented, but surgical procedure time increases due to prolonged control cycles
Solution Approach 1:
The control profiles are established during the extension phase before retraction begins. This preliminary determination of speed and force parameters eliminates the need for continuous real-time control calculations during retraction, thereby preventing system damage while maintaining efficient surgical procedure timing.
3Manufacturing precision
If speed control during extension is adjusted based on sensed force, then manufacturing precision and operation safety are improved, but device complexity increases due to additional control processing
Solution Approach 1:
The sensor detects force applied to the drive component during extension, and the controller adjusts motor speed based on this feedback to maintain precise control. This feedback mechanism ensures safe and precise operation while the controller processes the force data to determine appropriate speed adjustments.
Solution Approach 2:
The controller modifies motor operating parameters (speed) in response to sensed force conditions during extension. By dynamically adjusting speed based on force feedback, the system achieves precise control and safe operation through parameter optimization.
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 solution ensures controlled retraction forces, minimizing the risk of system damage and reducing surgical procedure times by utilizing stored force and speed profiles to adjust motor speed accordingly, even in the absence of real-time feedback during retraction.
Implementation Method 1
a sensor configured to sense force exerted on the drive component during extension of the drive component
Data Source
AI summary
A powered handheld electromechanical surgical device includes a motor configured to drive extension and retraction of a drive component, a sensor configured to sense force exerted on the drive component during extension of the drive component, and a controller including a processor and a non-transitory computer-readable storage medium storing instructions that, when executed by the processor, cause the processor to receive the sensed force from the sensor, control a speed of the motor during extension of the drive component in accordance with the sensed force, determine a speed profile or a force profile during extension of the drive component, and control a speed of the motor during retraction of the drive component in accordance with the speed profile or the force profile.