Blood Pump Algorithm for Suction Prevention via Dynamic Speed
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Solution Overview
Problem
Implantable blood pumps face adverse events such as suction and occlusion due to volumetric depletion or proximity issues, which existing control methods fail to prevent effectively without negatively impacting patient perfusion.
Innovation Solution
A control circuit with processing circuitry that adjusts the pump speed based on the timing of the cardiac cycle and flow parameters, reducing speed during specific segments of the systole phase when flow thresholds are met to prevent adverse events with minimal impact on perfusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump speed is reduced to clear adverse events, then suction is prevented, but patient perfusion is negatively affected by unsafe magnitude and duration
Solution Approach 1:
The pump control system dynamically adjusts speed in real-time based on detected cardiac cycle phase and adverse event status. During systole, the pump operates at high speed to maximize perfusion, while during diastole, speed is reduced to prevent suction. This dynamic adjustment allows the system to optimize both perfusion and suction prevention without compromising either parameter.
Solution Approach 2:
The control algorithm implements periodic speed modulation synchronized with the cardiac cycle. The pump alternates between high-speed operation during systole and low-speed operation during diastole, creating a rhythmic pattern that matches physiological cycles. This periodic action enables the system to maintain high overall perfusion while periodically preventing suction events.
2Reliability
If pump speed is reduced during systole to prevent suction, then adverse events are cleared, but perfusion is significantly impacted
Solution Approach 1:
The cardiac cycle is segmented into distinct phases (systole and diastole), and the pump operates at different speeds during each phase. During systole, the pump runs at high speed to maximize blood flow and perfusion. During diastole, the pump transitions to low speed to prevent suction. This segmentation allows the system to achieve suction prevention without compromising overall flow rate.
Solution Approach 2:
The control system changes the operational parameter (pump speed) based on the detected cardiac phase. Speed is set to a first value during systole and a second, lower value during diastole. This parameter change enables the system to prevent suction during vulnerable phases while maintaining high perfusion during productive phases.
3Device complexity
If existing control methods are used, then pump operation is simplified, but adverse events cannot be prevented without compromising perfusion
Solution Approach 1:
The control algorithm continuously monitors pump operation and cardiac cycle phase, using this feedback to dynamically adjust speed. The system detects adverse events in real-time and responds by modulating speed according to the current cardiac phase. This feedback mechanism enables sophisticated suction prevention while maintaining relatively simple overall system architecture.
Solution Approach 2:
The pump control system autonomously adjusts its own operation based on detected conditions. The algorithm automatically detects cardiac phase, identifies adverse events, and modifies speed without external intervention. This self-service capability allows the system to prevent adverse events while maintaining perfusion, without requiring complex external control mechanisms.
Data Source
AI summary
A control circuit for controlling a pump speed of a blood pump implanted in a patient including a processor in communication with the implanted blood pump, the processor having processing circuitry configured to reduce a pump speed relative to a standard set speed based on a timing of a systole phase of the patient, the systole phase including a first segment during which a ventricular pressure is at its greatest and a second segment occurring after the first segment during which the ventricular pressure is at its lowest, the pump speed being reduced during the second segment.