STUDY OF SHOCK WAVE PROPAGATION AND PHASED-ARRAY FOCUSING FOR LITHOTRIPSY

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$200,000.00
Award Year:
1987
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
1574
Agency Tracking Number:
1574
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Southeast Division, 4917 Professional Court, Raleigh, NC, 27909
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Lawrence A. Twisdale
Principal Engineer & Manager
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
THIS PHASE I EFFORT WILL APPLY THEORETICAL METHODS BASED PRINCIPALLY ON CAGNIARD'S FORMALISM (PREVIOUSLY INCORPORATED BY US INTO OUR POWERFUL SWREF CODE), TO THE PROPAGATION AND FOCUSING, IN BOTH REFLECTIVE AND PHASED-ARRAY EQUIPMENT, OF SHOCK-WAVES PRODUCED BY UNDERWATER SPARKS. THE OBJECTIVE IS TO INVESTIGATE AND PROVIDE DESIGN DATA FOR LITHOTRIPSY EQUIPMENT IN WHICH FOCUSED SHOCK WAVES ARE USED TO DISINTEGRATE HUMAN KIDNEY STONES WITHOUT SURGICAL INTERVENTION. AREAS OF INTEREST NOT STUDIED BY PREVIOUS INVESTIGATORS WILL BE THE EFFECT OF EXTRA-FOCAL INCLUSIONS (E.G., PELVIC BONE) ON THE FOCUSING PROPERTIES OF REFLECTIVE AND PHASED ARRAYS, THE IMPORTANCE OR OTHERWISE ANOMALOUS EFFECTS SUCH AS PRODUCTION OF PSEUDO-RAYLEIGH WAVES, AND REVERBERATION EFFECTS IN STONES OF VARIOUS SIZES AND COMPOSITION; DEGRADATION OF SHOCK-PULSE RISE-TIMES WITH DISTANCE WILL ALSO BE INVESTIGATED. THE ADVANTAGES OF PHASED ARRAYS, EXPECTED TO BE INCREASED POWER-DENSITY, SHORT PROPAGATION DISTANCES AND FACILITY OF LOCALIZATION (THROUGH ELIMINATION OF THE LARGE WATER BATHS NOW NECESSARY), WILL BE EVALUATED. THE PHASING REQUIREMENTS AND THE ROLE OF FIRING-TIME JITTER WILL BE STUDIED BOTH THEORETICALLY AND BY A SIMPLE EXPERIMENT INVOLVING TWO INDEPENDENTLY-TRIGGERED SPARK GAPS. THE STUDY IS PLANNED TO ELUCIDATE FUNDAMENTAL PHENOMENA, AND NEITHER EQUIPMENT CONSTRUCTION NOR EXPERIMENTS IN LIVING TISSUES ARE CONTEMPLATED IN PHASE I.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government