Development and testing of second generation extracorporeal shock-wave lithotriptor.
The Northgate SD-3 extracorporeal shock-wave lithotriptor is a second generation device that utilizes an ultrasound-guided computer-assisted system for calculus localization. Focused electrohydraulic shock waves are generated in a movable membrane-covered ellipsoidal reflector. Pressure wave characteristics and energy output of the SD-3 and the Dornier HM-3 were tested and found to be comparable. The ultrasound unit was capable of identifying radiolucent calculi as well as calculus fragments 2-3 mm in size. The computer-assisted aiming system was found to be accurate to within 1 mm. The overall successful calculus fragmentation rate using an animal model was 80 percent with an 87.5 percent rate following machine modifications resulting in increased energy output.
Begun
F P
FP
Department of Urology, Medical College of Wisconsin, Milwaukee.
Lawson
R K
RK
Cauley
J E
JE
Kearns
C M
CM
Foley
D
D
Middelton
W D
WD
D000818:Animals; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008096:Lithotripsy / Q000295:instrumentation* / Q000379:methods; D013552:Swine; D014463:Ultrasonography; D014545:Urinary Calculi / Q000175:diagnosis / Q000628:therapy