Atherectomy Motor Stall Detection and Active Deceleration Control
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Solution Overview
Problem
Current medical devices, particularly atherectomy systems, face challenges in safely and effectively managing stall conditions during procedures, which can lead to increased torque and force on patients due to the lack of real-time monitoring and automated response mechanisms.
Innovation Solution
The integration of a control unit with sensors and a motor state estimator that monitors motor parameters such as speed, torque, and position, allowing for the detection of stall conditions and automatic deceleration through adjustments in motor torque or current direction, thereby mitigating forces applied to patients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time monitoring and automated response mechanisms are added to medical devices, then safety and control during procedures is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors motor parameters (speed, current, voltage) and automatically adjusts motor state in response to detected stall conditions. This closed-loop feedback system enables real-time safety monitoring and automated response without requiring complex mechanical structures, resolving the contradiction by using electronic control to achieve reliability while managing complexity.
2Productivity
If motor speed is increased to maintain effective therapy, then productivity is improved, but the risk of injury during stall conditions worsens
Solution Approach 1:
The control unit proactively detects stall conditions by monitoring motor parameters and automatically decelerates the motor before excessive kinetic energy can cause harm. This preliminary protective action allows the motor to operate at high speeds for effective therapy while preventing injury by intervening before dangerous conditions develop.
Solution Approach 2:
The system converts the potentially harmful high-speed operation during stall conditions into a benefit by using the motor's own kinetic energy to drive the atherectomy procedure effectively, then quickly dissipating that same kinetic energy through automated deceleration when stall conditions are detected, thus transforming the risk into therapeutic effectiveness.
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 member coupled to an end of the drive shaft, a motor coupled to the drive shaft to rotate the rotational tip, and a control unit configured to control a motor state of the motor. The motor may be an electric motor. The control unit may adjust the motor state to decelerate the motor in response to detecting a jam or a stall condition. The jam or stall condition may be detected when a speed of the motor or other motor state reaches or goes beyond a threshold value as prescribed by a reference schedule.