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.
Department of Urology, Medical College of Wisconsin, Milwaukee.
F P
FP
Begun
R K
RK
Lawson
J E
JE
Cauley
C M
CM
Kearns
D
D
Foley
W D
WD
Middelton
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