Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1981-10-13
1984-05-29
Gill, James J.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73168, G01M 1900
Patent
active
044507100
ABSTRACT:
A device for hydrodynamic, in vitro testing of heart valve prostheses. The device has a flow channel in which a flow of desired characteristics is induced. The flow channel includes a test fixture for supporting a prosthesis to be tested in a desired orientation within the flow. In a preferred embodiment, the test fixture includes first and second chambers spaced from each other along the flow channel and a shuttle intermediate the chambers which is movable between at least first and second positions. The shuttle includes at least one support for a heart valve prosthesis and selectively positions that prosthesis in the desired orientation within the flow by movement between the first and second positions. The shuttle may carry two or more heart valve prostheses to alternatively positioned one of them within the flow by movement of the shuttle. The chambers may be movable relative to each other to facilitate the establishment of static and dynamic seals of the flow channel between each of the chambers and the shuttle.
REFERENCES:
patent: 3962906 (1976-06-01), Heitmann et al.
Article entitled, "In Vitro Assessment of Mitral Valve Protheses", J. Thorac Cardio Surg., 79:680-688, 1980.
Article entitled, "In Vitro Hydrodynamic Comparison of Mitral Valve Bioprostheses", Cardiovascular Surgery, 1978, Supp. 1, Cir., vol. 60, No. 2, Aug. 1979.
Article entitled, The New Tilting Disc Cardiac Valve Prostheses, submitted to J. Thorac Cardio Surg. by Lawrence N. Scotten et al., pp. 1-23.
Article entitled, Pressure Drops Across Prosthetic Aortic Heart Valves Under Steady and Pulsatile Flow-In Vitro Measurements, J. Biomechanics, vol. 12, pp. 153-164, 1979.
Article entitled, "A Method of Measuring the Mean Pressure Gradient Across Prosthetic Heart Valves under In Vitro Pulsatile Flow Conditions", Medical Instrumentation, vol. 11, No. 2, pp. 110-113, Mar.-Apr. 1977.
Article entitled, The Lillehei-Kaster Pivoting Disc Aortic Prosthesis and A Comparative Study of Its Pulsatile Flow Characteristics with Four Other Prostheses, Trans. Amer. Soc. Artif. Int. Organs, vol. XVI, pp. 233-243, 1970.
Gill James J.
Medtronic Inc.
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