Development of a computer assisted gantry system for gaining rapid and accurate calyceal access during percutaneous nephrolithotomy
Int. braz. j. urol
;
36(6): 738-748, Dec. 2010. ilus, graf
Article
in English
| LILACS
| ID: lil-572425
ABSTRACT
PURPOSE:
To design a simple, cost-effective system for gaining rapid and accurate calyceal access during percutaneous nephrolithotomy (PCNL). MATERIALS ANDMETHODS:
The design consists of a low-cost, light-weight, portable mechanical gantry with a needle guiding device. Using C-arm fluoroscopy, two images of the contrast-filled renal collecting system are obtained at 0-degrees (perpendicular to the kidney) and 20-degrees. These images are relayed to a laptop computer containing the software and graphic user interface for selecting the targeted calyx. The software provides numerical settings for the 3 axes of the gantry, which are used to position the needle guiding device. The needle is advanced through the guide to the depth calculated by the software, thus puncturing the targeted calyx. Testing of the system was performed on 2 target types 1) radiolucent plastic tubes the approximate size of a renal calyx (5 or 10 mm in diameter, 30 mm in length); and 2) foam-occluded, contrast-filled porcine kidneys.RESULTS:
Tests using target type 1 with 10 mm diameter (n = 14) and 5 mm diameter (n = 7) tubes resulted in a 100 percent targeting success rate, with a mean procedure duration of 10 minutes. Tests using target type 2 (n = 2) were both successful, with accurate puncturing of the selected renal calyx, and a mean procedure duration of 15 minutes.CONCLUSIONS:
The mechanical gantry system described in this paper is low-cost, portable, light-weight, and simple to set up and operate. C-arm fluoroscopy is limited to two images, thus reducing radiation exposure significantly. Testing of the system showed an extremely high degree of accuracy in gaining precise access to a targeted renal calyx.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Nephrostomy, Percutaneous
/
Surgery, Computer-Assisted
/
Kidney Calices
Type of study:
Evaluation studies
Language:
English
Journal:
Int. braz. j. urol
Journal subject:
Urology
Year:
2010
Type:
Article
Affiliation country:
South Africa
Institution/Affiliation country:
University of Stellenbosch/ZA
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