Extracorporeal shock wave lithotripsy is a non surgical alternative for the treatment of cholelitiasis. At present, there are three main types of shock waves generators, one of them an electromagnetic device is (lithostar plus). The aim of this work is inform results obtained using Lithostar plus machine for the treatment of patients with a single gallstone. From total of 722 patients, 98 filled criteria for lithotripsy treatment; 63 patients had a single gallstone, with a mean age of 48.83 +/- 13.89 22 were males and 41 females. Patients were divided in 5 groups in base of the number of extracorporeal shock waves used, all of them had similar a gallstones of similar size. 32 patients (50.8%) showed total fragmentation with only one session. According with the results obtained, we can conclude that using lithostar plus we can get total fragmentation in one session in 50.8% of patients with a single gallstone.