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Considerations and problems in the development of the mini-spindle pump
J Hager1, J Koller, F Gschnitzer
1Surgical Clinic I, University of Innsbruck, Austria.
Artificial Organs
|July 1, 1995
Summary
This study developed an implantable mini-spindle pump for assisted circulation. Early prototypes showed promise but caused significant blood trauma (hemolysis), necessitating design modifications to improve biocompatibility.
Area of Science:
- Biomedical Engineering
- Cardiovascular Devices
- Hemodynamics
Background:
- Development of implantable devices for assisted circulation is crucial for treating heart failure.
- Existing devices face challenges with efficiency and blood compatibility.
Purpose of the Study:
- To design and evaluate a novel mini-spindle pump for assisted circulation.
- To assess and minimize blood trauma (hemolysis) during device operation.
Main Methods:
- Initial prototype design based on hydrodynamic calculations for water circulation.
- Testing in mock circulation and subsequent evaluation in a Maxima oxygenator with blood.
- Iterative design modifications of the rotor and housing to reduce hemolysis.
Main Results:
- First prototype achieved high flow rates in mock circulation but caused significant hemolysis (>250 mg% free hemoglobin).
- Modified prototypes showed improved flow (4.3-4.5 L/min) and reduced hemolysis (down to 180 mg% in one iteration), but blood trauma remained a concern.
- Fourth prototype improved function but increased blood trauma compared to the third.
Conclusions:
- The mini-spindle pump design requires further optimization to balance flow efficiency and hemocompatibility.
- Reducing blood trauma is a critical challenge for the successful clinical application of this assisted circulation device.