scholarly journals Visualization of the Cavitation Bubbles on the Mechanical Heart Valves using High-speed Cameras

2002 ◽  
Vol 22 (1Supplement) ◽  
pp. 293-294
Author(s):  
Koki TAKIURA ◽  
Tsuneo CHINZEI ◽  
Yusuke ABE ◽  
Takashi ISOYAMA ◽  
Itsuro SAITO ◽  
...  
Keyword(s):  
High Speed ◽  
Heart Valves ◽  
Mechanical Heart Valves ◽  
Cavitation Bubbles

Cavitation Dynamics of Medtronic Hall Mechanical Heart Valve Prosthesis: Fluid Squeezing Effect

1996 ◽  
Vol 118 (1) ◽  
pp. 97-105 ◽  
Author(s):  
C. S. Lee ◽  
K. B. Chandran ◽  
L. D. Chen
Keyword(s):  
Flow Field ◽  
Vapor Pressure ◽  
High Speed ◽  
Heart Valves ◽  
Loading Rate ◽  
Mechanical Heart Valve ◽  
Mechanical Heart Valves ◽  
Valve Prosthesis ◽  
Pressure Reduction ◽  
Local Flow

The cause of cavitation in mechanical heart valves is investigated with Medtronic Hall tilting disk valves in an in vitro flow system simulating the closing event in the mitral position. Recordings of pressure wave forms and photographs in the vicinity of the inflow surface of the valve are attempted under controlled transvalvular loading rates averaged during valve closing period. The results revealed presence of a local flow field with a very high velocity around the seat stop of mechanical heart valves that could induce pressure reduction below liquid vapor pressure and a cloud of cavitation bubbles. The analysis of the results indicates that the “fluid squeezing” between the stop and occluder as the main cause of cavitation in Medtronic Hall valves. The threshold loading rate for cavitation initiation around the stop was found to be very low (300 and 400 mmHg/s; half the predicted normal human loading rate that was estimated to be 750 mmHg/s) because even a mild impact created a high speed local flow field on the occluder surface that could induce pressure reduction below vapor pressure. The present study suggests that mechanical heart valves with stops at the edge of major orifice region are more vulnerable to cavitation, and hence, have higher potential for damage on valve components and formed elements in blood.

Observation of cavitation bubbles in monoleaflet mechanical heart valves

2004 ◽  
Vol 7 (3) ◽  
pp. 121-127 ◽  
Author(s):  
Hwansung Lee ◽  
Tomonori Tsukiya ◽  
Akihiko Homma ◽  
Tadayuki Kamimura ◽  
Yoshiaki Takewa ◽  
...  
Keyword(s):  
Heart Valves ◽  
Mechanical Heart Valves ◽  
Cavitation Bubbles

Dabigatran versus Warfarin in Patients with Mechanical Heart Valves

2013 ◽  
Vol 369 (13) ◽  
pp. 1206-1214 ◽  
Author(s):  
John W. Eikelboom ◽  
Stuart J. Connolly ◽  
Martina Brueckmann ◽  
Christopher B. Granger ◽  
Arie P. Kappetein ◽  
...  
Keyword(s):  
Heart Valves ◽  
Mechanical Heart Valves
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