Professor Robin Cleveland, Institute of Biomedical Engineering, Oxford University

Lithotripsy: role of spall and shear in kidney stone fragmentation
When Feb 03, 2014
from 02:00 PM to 03:00 PM
Where LR8
Contact Name
Contact Phone 01865-283302
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Shock wave lithotripsy (SWL) is a clinical procedure whereby shock waves, generated outside the body, are used to break-up kidney stones.  First introduced in  1980 it revolutionized the treatment of renal calculi and at it is still the first line modality for treating kidney stones in the UK.   Despite the wide spread use of SWL there is no agreement in the literature as to the mechanism, or mechanisms, by which shock waves fragment kidney stones.  The leading effects are the direct stress of the shock wave on the stone and cavitation in the fluid surrounding the stone.    In this talk I will look at the evolution of stress due to the incident shock wave and in particular looking at spall - associated with reflection from the back of the stone - and shear waves - associated with mode coupling at the equator of the stone.  It will be shown that shear waves appear to dominate the generation of tensile stress in the stone and this has an impact on how shock waves should be generated.