Artificial Heart Pump Suction Detection via Hysteresis Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Continuous flow total artificial heart systems face challenges in detecting and preventing suction conditions at pump inlets, which can lead to imbalances in blood flow and potentially cause hemolysis or thrombosis, and existing solutions are not effective in automatically responding to physiological changes with minimal sensor usage.
Innovation Solution
The system employs mathematical algorithms to recognize suction conditions by analyzing hysteresis loops in position sensor output, pump power, and motor current waveforms, using these parameters to modulate pump speed and adjust operations to prevent suction events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump operates at high speed to maintain adequate blood flow, then productivity is improved, but suction conditions occur causing hemolysis and thrombosis
Solution Approach 1:
The system performs preliminary detection of suction conditions by analyzing hysteresis loops in position sensor output, pump power, and motor current waveforms before actual suction damage occurs. The controller continuously monitors these parameters and modulates pump speed in advance to prevent suction events, thereby protecting against hemolysis and thrombosis while maintaining adequate blood flow productivity
Solution Approach 2:
The system implements feedback control by continuously monitoring position sensor output, pump power, and motor current waveforms, comparing them against expected hysteresis loop patterns, and automatically adjusting pump speed in response to detected deviations that indicate developing suction conditions, thus preventing harmful effects while maintaining productivity
2Ease of operation
If external control is used to operate the CFTAH, then ease of operation is improved, but the system cannot automatically respond to physiological changes
Solution Approach 1:
The system performs self-service by automatically detecting suction conditions through analysis of position sensor output, pump power, and motor current waveforms, and autonomously modulating pump speed in response to detected physiological changes without requiring external intervention, thereby maintaining ease of operation while achieving adaptability
Solution Approach 2:
The controller continuously monitors system parameters including position sensor output, pump power, and motor current waveforms, uses feedback from hysteresis loop analysis to automatically adjust pump operation in response to physiological changes, eliminating the need for external control while maintaining ease of use
3Measurement precision
If multiple sensors are used to detect suction conditions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system applies multi-functionality by using existing pump operational parameters (position sensor output, pump power, motor current waveforms) for multiple purposes: normal pump control, physiological response adjustment, and suction condition detection. This eliminates the need for additional dedicated suction sensors, reducing device complexity while maintaining measurement precision through hysteresis loop analysis of the multi-functional parameters
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively identifies and mitigates suction conditions, ensuring stable blood flow and preventing complications such as hemolysis and thrombosis, while minimizing unnecessary responses to fluctuations in vascular resistance.
Implementation Method 1
a position sensor monitors the axial position of the rotating assembly magnet
Implementation Method 2
a suction condition is recognized by characteristics in the hysteresis loop of position sensor output versus speed
Implementation Method 3
a suction condition is recognized by characteristics in the hysteresis loop of pump power versus speed
Data Source
AI summary
A system and method of controlling the operation of a pump system includes modulating the speed of the pump and calculating a system condition parameter having a value related to the area of a hysteresis loop generated by a system operating parameter that varies in response to pump speed. The condition of the system is determined in response to the value of the system condition parameter.