The first, installed in 1985, has treated over 15,000 patients so far. The second, the Piezo-electric lithotripter, has the added advantage of using ultrasound and x-ray guidance, enabling treatment of stones which were previously inaccessible.

Lithotripsy
Years	No. of Patients	Years	No. of Patients
1999	2,878	2004	3,844
2000	3,196	2005	2,968
2001	3,403	2006	3,725
2002	3,464	2007	3,609
2003	3,764