Circulatory Support Controller Feedback Loop
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Solution Overview
Problem
Current mechanical circulatory support devices, such as percutaneous ventricular assist devices (PVADs), face challenges in efficiently managing blood flow parameters like flow rate, mean arterial pressure, and left ventricular pressure, often requiring trial-and-error adjustments and relying on motor speed settings that can vary in effectiveness across patients and devices.
Innovation Solution
A circulatory support system with a controller that receives real-time circulatory parameter values, determines a command signal based on these parameters, and adjusts the blood pump's speed to achieve specific flow rates and pressures, incorporating sensors for motor speed and aortic pressure to optimize blood flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If motor speed settings are used to control blood flow parameters, then the device can operate with simple control mechanisms, but the effectiveness varies across patients and devices requiring trial-and-error adjustments
Solution Approach 1:
The system incorporates sensors that continuously monitor blood flow parameters (flow rate, mean arterial pressure, left ventricular pressure) and feed this information back to the controller. The controller automatically adjusts motor speed based on this feedback to maintain target parameter values, eliminating the need for manual trial-and-error adjustments and ensuring consistent effectiveness across different patients and devices.
2Device complexity
If trial-and-error adjustments are used to manage blood flow parameters, then the device structure remains simple, but the time required to achieve optimal parameters increases
Solution Approach 1:
The control system performs self-adjustment by automatically processing sensor data and modifying motor speed commands without requiring external intervention. The controller continuously compares actual parameter values against target values and autonomously adjusts operation to achieve optimal parameters, significantly reducing the time required compared to manual trial-and-error methods.
3Measurement precision
If real-time sensor monitoring and automated control are implemented, then blood flow parameter management precision improves, but the device complexity increases
Solution Approach 1:
The controller is designed as a multi-functional integrated system that performs multiple tasks: acquiring data from multiple sensors, processing signals, comparing values against targets, calculating required adjustments, and commanding motor speed changes. This universal controller consolidates what could be separate complex subsystems into a single coordinated unit, achieving precise parameter management while managing overall device complexity.
4Manufacturing precision
If multiple sensors for motor speed and aortic pressure are added, then the precision of blood flow control improves, but the manufacturing cost and device complexity increase
Solution Approach 1:
The system merges multiple sensing functions into an integrated sensor assembly that monitors motor speed, aortic pressure, and other circulatory parameters simultaneously. The controller integrates data from all sensors and processes them together to generate unified control commands, streamlining the manufacturing process and reducing assembly complexity compared to separate independent control systems for each parameter.
Data Source
AI summary
A circulatory support system may include a blood pump and a controller. The blood pump may include a driven component and a motor in communication with the driven component and the controller to drive the driven component to pump a blood flow through the blood pump. The controller may be configured to receive a value of a circulatory parameter related to blood flow through a patient, determine a value of a command signal based on the received value, and output the command signal to the motor to drive the driven component at a speed configured to achieve the value of the circulator parameter related to blood flow through the patient.