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ATS prosthetic valve motion: an in vitro analysis.
1Department of Surgery, Kurume University School of Medicine, Kurume-city, Japan.
The Journal of Heart Valve Disease
|July 11, 2000
Summary
The ATS valve, unlike the St. Jude Medical valve, did not open fully in most outflow configurations. This restricted opening of the ATS valve may be due to its structural features.
Area of Science:
- Biomedical Engineering
- Cardiovascular Devices
- Fluid Dynamics
Background:
- Clinical findings indicate incomplete opening of normally functioning open pivot ATS valves.
- In vitro testing was necessary to precisely analyze ATS valve motion.
Purpose of the Study:
- To compare the opening characteristics of ATS and St. Jude Medical (SJM) valves.
- To investigate the influence of outflow configurations on valve performance.
Main Methods:
- Measured opening angles and pressure gradients of ATS and SJM valves under steady and pulsatile flow.
- Evaluated valve performance in straight and abrupt enlargement outlet configurations.
- Conducted flow visualization studies.
Main Results:
- ATS valve opening was restricted in most outflow configurations, unlike the SJM valve.
- Under pulsatile flow, the ATS valve showed incomplete opening in an abrupt enlargement outlet.
- Turbulent flow was observed, particularly with the ATS valve.
Conclusions:
- The ATS valve's full opening is dependent on a straight outflow configuration.
- Structural characteristics of the ATS valve likely contribute to its unique opening behavior.