... of a simulation chamber under the physiologic and elevated closing conditions of 2500 mm Hg / s and 4500 mm Hg / s , respectively. Cavitation energy, detected as high-frequency pressure transients with a hydrophone, was the measure used to compare the modified valve with its unaltered counterpart. The cavitation...

... cycle, where cavitation is known to occur and blood damage is most severe. Closure of the tilting disk valve was studied in a “single shot” chamber driven by a pneumatic pump. Laser Doppler velocimetry was used to measure all three velocity components over a 30 ms period encompassing the initial valve...

...Luke H. Herbertson; Varun Reddy; Keefe B. Manning; Joseph P. Welz; Arnold A. Fontaine; Steven Deutsch Cavitation is known to cause blood element damage and may introduce gaseous emboli into the cerebral circulation, increasing the patient’s risk of stroke. Discovering methods to reduce...

...Brant H. Maines; Christopher E. Brennen The cavitation inception threshold of mechanical heart valves has been shown to be highly variable. This is in part due to the random distribution of the initial and final conditions that characterize leaflet closure. While numerous hypotheses exist...

...Peter Johansen; Keefe B. Manning; John M. Tarbell; Arnold A. Fontaine; Steven Deutsch; Hans Nygaard Evaluation of cavitation in vivo is often based on recordings of high-pass filtered random high-frequency pressure fluctuations. We hypothesized that cavitation signal components are more...

...Hsin-Yi Lin; Brian A. Bianccucci; Steven Deutsch; Arnold A. Fontaine; J. M. Tarbell Clinical studies using transcranial Doppler ultrasonography in patients with mechanical heart valves (MHV) have detected gaseous emboli. The relationship of gaseous emboli release and cavitation on MHV has been...

...Sean D. Chambers; Robert H. Bartlett; Steven L. Ceccio The purpose of this study was to determine the hemolytic potentials of discrete bubble cavitation and attached cavitation. To generate controlled cavitation events, a venturi-geometry hydrodynamic device, called a Cavitation Susceptibility...