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A flow visualization study of the NCVC centrifugal blood pump
K Araki1, Y Taenaka, T Masuzawa
1Department of Artificial Organs, National Cardiovascular Center Research Institute, Osaka-Suita, Japan.
Artificial Organs
|September 1, 1994
Summary
The NCVC-1 centrifugal pump shows excellent flow characteristics with minimal turbulence and stagnation, crucial for reducing blood damage and preventing clots. Visualization methods confirmed its efficient hydraulic performance.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Medical Device Design
Background:
- Centrifugal pumps are vital in medical devices, but flow characteristics like turbulence and stagnation can cause hemolysis and thrombus formation.
- The NCVC-1 pump is a novel design featuring an open-type impeller, no shaft, and no seal, with a central tunnel for rotor irrigation.
Purpose of the Study:
- To evaluate the internal flow characteristics of the compact centrifugal pump, NCVC-1.
- To assess the pump's potential for low hemolysis and high antithrombogenicity.
Main Methods:
- Employed three flow visualization techniques: tracer method, oil film, and injection streak line.
- Analyzed flow patterns along the impeller vanes and within the volute chamber.
- Observed the washout flow behind the rotor to assess stagnation and potential thrombus formation.
Main Results:
- Tracer method revealed minimal turbulence along the NCVC-1's vanes.
- The volute chamber effectively reduced vortex formation at the outlet.
- Oil film patterns showed no flow separation on vanes at 5 L/min; washout flow was an inward spiral without stagnation.
Conclusions:
- A combination of visualization techniques effectively analyzed complex flow conditions.
- The NCVC-1 pump exhibits excellent flow characteristics, including low turbulence and minimal flow stagnation.
- These findings suggest the NCVC-1 pump is highly suitable for applications requiring low hemolysis and high antithrombogenicity.