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The valvo-pump. An axial, nonpulsatile blood pump.
1Department of Surgery, Keio University School of Medicine, Tokyo, Japan.
ASAIO Transactions
|July 1, 1991
Summary
The valvo-pump offers a promising alternative to artificial heart replacement, featuring an anatomical fit and simpler implantation. Further development of its motor and seal could enhance its feasibility for clinical use.
Area of Science:
- Biomedical Engineering
- Cardiovascular Devices
- Medical Technology
Background:
- Artificial heart replacements present challenges in anatomical fit and blood contact surface area.
- The valvo-pump is designed as an axial, nonpulsatile blood pump implanted at the heart valve position.
- This approach aims to preserve native heart muscle while offering potential advantages over total heart replacement.
Purpose of the Study:
- To evaluate the performance characteristics of the valvo-pump.
- To assess the feasibility of the valvo-pump as a cardiac assist device.
- To identify areas for further development to improve pump performance.
Main Methods:
- The valvo-pump, featuring a 37mm diameter housing and variable impeller designs, was tested.
- A samarium-cobalt-rare-earth magnet DC brushless motor with a magnetic fluid seal was utilized.
- Performance was evaluated using a hydraulic mock circulatory system.
Main Results:
- The valvo-pump achieved a flow rate of 6.9 L/min at a differential pressure of 48 mmHg.
- A flow rate of 3.1 L/min was recorded at a differential pressure of 58 mmHg.
- The pump's design includes a 10-vane or 5-vane impeller and a 4-vane guiding wheel.
Conclusions:
- The valvo-pump demonstrates potential as a cardiac assist device with advantages in fit and implantation.
- Optimization of the impeller design, motor power, and seal durability are crucial for clinical feasibility.
- Further research and development are needed to refine the valvo-pump technology.