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15 results on '"Akers, W. W."'

10. Numerical hydrodynamic calculations of catheter characteristics.

Author

Akers WW, Barnard AC, Bourland HM, Hunt WA, Timlake WP, and Varley E

Subjects
Biophysical Phenomena, Biophysics, Blood Flow Velocity, Blood Pressure, Computers, Humans, Models, Theoretical, Blood Circulation, Catheterization, Rheology
Abstract

The theory of fluid flow in compliant tubes developed in a previous paper is applied to a catheter, and the results of various calculations are compared with experiment. When a parabola is used for the unknown velocity profile, the calculated gains are too high. Agreement is slightly improved by using more reasonable profiles. It is shown that there exists a functional relationship between the parameter gamma and the nondimensional parameter alpha(10) which gives reasonable agreements with all the experimental data considered. The theory of Womersley is applied to the catheter, and the calculated gains are larger than those observed experimentally. A form for the frictional force suggested by Lambossy is used in some further calculations.

Published
1966
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11. Progress toward an orthotopic cardiac prosthesis.

Author

Kennedy JH, DeBakey ME, Akers WW, Ross JN Jr, O'Bannon W, Baker LE, Greenberg SD, Wieting DW, Lewis CW, Adachi M, Alfrey CP Jr, Spargo WJ, and Fuqua JM Jr

Subjects
Anesthesia, Animals, Blood Circulation, Brain pathology, Cardiac Output, Cardiac Surgical Procedures, Cattle, Extracorporeal Circulation, Female, Heart, Artificial adverse effects, Hemodynamics, Intestine, Small pathology, Kidney pathology, Liver pathology, Lung pathology, Lung physiology, Methods, Prosthesis Design, Time Factors, Trachea pathology, Heart, Artificial instrumentation
Published
1973
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14. Development of an orthotopic cardiac prosthesis.

Author

Kennedy JH, De Bakey ME, Akers WW, Ross JN Jr, O'Bannon W, Baker LE, Greenberg SD, Wieting DW, Lewis CW, Adachi M, Alfrey CP Jr, Spargo WJ, Walker W, and Fuqua JM Jr

Subjects
Animals, Aspartate Aminotransferases blood, Biomedical Engineering, Blood Coagulation, Blood Platelets, Cattle, Cerium Isotopes, Chromium Isotopes, Embolism etiology, Hemodynamics, Hemoglobins, Kidney blood supply, Kidney Diseases etiology, Lung Diseases etiology, Methylmethacrylates, Microspheres, Monitoring, Physiologic, Oscillometry, Polyethylene Terephthalates, Polyvinyls, Pulmonary Edema etiology, Strontium Isotopes, Thrombosis etiology, Water-Electrolyte Balance, Heart, Artificial adverse effects
Published
1973

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