PMID: 8580934Oct 1, 1995Paper

Mechanical impactor employing Nitinol probes to fragment human calculi: fragmentation efficiency with flexible endoscope deflection

Journal of Endourology
P LoisidesD H Bagley

Abstract

The Browne Pneumatic Impactor (BPI; Browne Medical Systems, Minneapolis, MN) is a new mechanical lithotripter that relies on a pneumatically driven metal probe. It can be employed through both rigid and actively deflectable flexible endoscopes. Prior in vivo studies have shown excellent fragmentation of hard human calculi while employing the BPI with active endoscope deflection of as much as 45 degrees. In this study, we set out to define the efficiency of stone fragmentation with active endoscope deflection and to quantify the extent of retrograde stone migration that is often noted when mechanical lithotripters are employed. Pressure transducer testing of the BPI revealed an inverse relation between increased deflection of the endoscope and transduced voltage. Calculus fragmentation tests showed that as the endoscope was actively deflected to 90 degrees, the BPI still was able to fragment human calcium oxalate monohydrate calculi into extractable fragments with as few as six pulses. The maximum active endoscope deflection was 95 degrees with the 0.020-inch Nitinol probe passed through the working channel. At this deflection, the BPI was able to fragment an 8 mm pure calcium oxalate monohydrate calculus into two fragments afte...Continue Reading

Citations

Jun 2, 1998·Journal of Endourology·C L TehG M Preminger
Feb 1, 1997·The Urologic Clinics of North America·J A Grocela, S P Dretler
Mar 29, 2012·Scandinavian Journal of Urology and Nephrology·Takashi KawaharaJunichi Matsuzaki
Jun 1, 2000·The Australian and New Zealand Journal of Surgery·A J CostelloJ S Peters
Jan 10, 2001·Current Opinion in Urology·M S MichelP Alken
Apr 25, 2000·The Urologic Clinics of North America·W Zheng, J D Denstedt

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