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Control system modification of an electromechanical pulsatile total artificial heart
Y Ohashi1, A de Andrade, J Müller
1Baylor College of Medicine, Department of Surgery, Houston, Texas 77030, USA.
Artificial Organs
|January 10, 1998
Summary
A modified Hall effect sensor in the total artificial heart (TAH) ensures stable pumping, preventing malfunctions. This enhancement led to error-free operation during a one-month in vitro test.
Area of Science:
- Biomedical Engineering
- Cardiovascular Devices
- Control Systems
Background:
- Reliable control systems are crucial for electromechanical pulsatile total artificial hearts (TAHs).
- Ensuring error-free procedures is essential for successful in vivo implantation of TAHs.
- Previous controller designs were susceptible to Hall effect sensor missensing, risking TAH malfunction.
Purpose of the Study:
- To modify the TAH controller to prevent Hall effect sensor missensing.
- To ensure stable pumping performance of the TAH.
- To validate the modified controller's reliability through in vitro testing.
Main Methods:
- Modified the Hall effect sensor's installation position from the housing top to the central piece.
- Integrated small magnets into the stabilizer rods for sensor interaction.
- Utilized the Hall effect sensor as an electrical switch within the control system.
- Conducted a one-month in vitro running test of the modified TAH.
Main Results:
- The modified TAH control system demonstrated stable pumping without Hall effect sensor missensing.
- The in vitro test confirmed completely error-free pumping characteristics over one month.
- Achieved a total efficiency of 12.6 +/- 1.4% at 8 L/min and 10.7 +/- 1.0% at 6 L/min outflow.
Conclusions:
- The controller modification successfully eliminated Hall effect sensor missensing.
- The enhanced TAH exhibits reliable and error-free pumping performance.
- The improved TAH design is suitable for further in vivo evaluation.