Atherectomy Cutter Control Using Sensor Feedback
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Solution Overview
Problem
Operators face challenges in determining how to adjust the operation of atherectomy devices for cutting lesions in blood vessels, as it is difficult to precisely control the cutting unit's rotational speed and pressure, leading to inadequate cutting performance.
Innovation Solution
A medical system equipped with sensors to detect physical quantities related to cutting operations, a controller to determine cutting parameters based on these detections, and a motor to rotate the drive shaft accordingly, enabling automatic adjustment of cutting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operator increases the rotational speed of the cutting unit or presses the cutting unit strongly against the lesion, then the cutting performance is improved, but it is difficult to determine the appropriate adjustment according to various cutting situations
Solution Approach 1:
The system uses sensors to detect physical quantities related to the cutting operation (such as torque, rotational speed, pressure) and feeds this information back to the controller. The controller automatically adjusts the motor rotation based on this feedback, enabling the system to adapt to various cutting situations without requiring the operator to manually determine appropriate adjustments.
Solution Approach 2:
The cutting unit is equipped with an automatic control system that monitors its own operation through sensors and adjusts its parameters autonomously. The controller processes sensor data and automatically modifies motor rotation to optimize cutting performance, allowing the system to serve itself rather than requiring continuous operator intervention for parameter adjustment.
2Adaptability or versatility
If the operator manually adjusts the cutting operation, then the system can adapt to various cutting situations, but the workability is reduced due to difficulty in determining appropriate operations
Solution Approach 1:
Sensors continuously monitor cutting parameters and provide feedback to the controller, which automatically adjusts motor rotation to match the specific cutting situation. This closed-loop control enables the system to adapt to varying conditions while maintaining ease of operation, as the controller handles the adaptation automatically rather than requiring manual operator judgment.
Solution Approach 2:
The patent replaces the manual mechanical adjustment process with an automated control system. Instead of the operator manually determining and adjusting parameters, the system uses electronic sensors and controllers to automatically regulate motor rotation, substituting human decision-making with automated electronic control that provides consistent and accurate adaptation.
Data Source
AI summary
A medical system includes a device for removing an object in a body cavity, the device including a shaft portion including a rotatable drive shaft, a motor configured to rotate the drive shaft, and a cutter attached to a distal end of the drive shaft and configured to perform a cutting operation on the object when the drive shaft is rotated by the motor. The medical system further includes one or more sensors each configured to detect a physical quantity related to the cutting operation, and a controller configured to determine one or more cutting parameters for the cutting operation based on the physical quantity detected by each of the sensors, and control the motor to rotate the drive shaft according to the determined cutting parameters.