Atherectomy Motor Controller Dynamic Load Adjustment
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Solution Overview
Problem
Current medical devices, particularly atherectomy systems, face challenges in effectively managing motor load outputs during procedures, leading to inadequate or excessive torque when navigating occlusions in vascular tissues, which can result in inefficiency or risk to patients.
Innovation Solution
The atherectomy system incorporates a controller that determines the initial load output of the motor and adjusts the maximum load output based on real-time feedback, using a predetermined range or threshold values to ensure the motor operates within safe limits, thereby maintaining adequate torque for occlusion removal without exceeding safe torque limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is configured to provide high torque output to effectively remove occlusions, then the productivity and effectiveness of the atherectomy procedure is improved, but the risk of causing harm to the patient increases due to excessive force
Solution Approach 1:
The system dynamically adjusts the motor's maximum load output parameter during operation based on real-time feedback. The controller monitors actual load output and automatically modifies the maximum allowable load to maintain safe operating limits while ensuring sufficient torque for occlusion removal, transforming a static motor configuration into a dynamically adaptive system that balances effectiveness and safety
Solution Approach 2:
The system incorporates feedback control where the controller receives real-time information about the motor's actual load output and uses this feedback to adjust the maximum load output parameter. This closed-loop control ensures that the motor operates within safe limits while maintaining adequate torque for the atherectomy procedure, preventing both insufficient and excessive force application
2Reliability
If the motor load output is strictly limited to safe maximum values, then patient safety is improved, but the adequacy of torque for effective occlusion removal deteriorates
Solution Approach 1:
Rather than using a fixed, conservative maximum load limit, the system dynamically determines and adjusts the maximum load output parameter based on real-time monitoring of actual motor performance. This allows the safety limit to adapt to actual operating conditions, ensuring both patient safety and adequate torque availability for effective occlusion removal
Solution Approach 2:
The feedback control mechanism continuously monitors actual load output and adjusts the maximum load parameter accordingly. This ensures that the motor operates within safe boundaries while maintaining sufficient torque for the procedure, resolving the contradiction between safety limits and effectiveness requirements
3Adaptability or versatility
If the motor provides variable load output during the procedure, then the adaptability to different tissue conditions is improved, but the complexity of controlling and monitoring the motor increases
Solution Approach 1:
The system implements self-service control where the motor controller automatically monitors and adjusts its own load output parameters based on real-time feedback from sensors. This autonomous operation eliminates the need for complex external monitoring and manual intervention, reducing overall system complexity while maintaining high adaptability to varying tissue conditions during the procedure
Data Source
AI summary
Medical systems and methods for making and using medical systems are disclosed. Example medical systems may include an atherectomy system configured to engage and remove plaque from walls in vessels of a vascular system. The atherectomy system may include a drive shaft, a rotational tip coupled to an end of the drive shaft, a motor coupled to the drive shaft to rotate the rotational tip, and a controller configured to control a motor state of the motor. The controller may adjust a range of possible load outputs from the motor and/or a maximum load output from the motor to account for external loads acting on the drive shaft and/or rotational tip rotated by the motor and facilitate passing an occlusion in a vasculature of a patient.