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Stryker frame gantry modification for extracorporeal shock wave lithotripsy to circumvent positioning problems
M Wiatrak1, D A Ohl, L P Sonda
1Department of Surgery, University of Michigan Medical Center, Ann Arbor.
The Journal of Urology
|August 1, 1991
Summary
A modified Stryker frame gantry improved Dornier HM3 lithotriptor positioning for renal and biliary calculi. This enabled shock wave therapy for patients with challenging anatomy or stone locations.
Area of Science:
- Urology
- Medical Engineering
Background:
- Standard Dornier HM3 lithotriptor gantry limitations hinder treatment for certain patient groups.
- Nonstandard patient positioning is often required for calculi in challenging locations or anatomies.
Purpose of the Study:
- To evaluate the efficacy of a Stryker frame gantry modification for Dornier HM3 lithotripsy.
- To assess the feasibility of treating patients with difficult-to-reach renal and biliary calculi.
Main Methods:
- A modified Stryker frame gantry was used with the Dornier HM3 lithotriptor for 45 patients between July 1986 and December 1989.
- Patients included those with distal/mid ureteral, gallbladder, common bile duct stones, and unusual body habitus.
Main Results:
- Successful shock wave focusing was achieved in 87% of patients.
- Fragmentation of calculi was successful in 89% of patients.
Conclusions:
- The Stryker frame gantry modification effectively overcomes positioning challenges with the Dornier HM3 lithotriptor.
- This modification expands lithotripsy candidacy to patients previously excluded due to positioning difficulties.