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Occlusion Devices Prevent Complications With Lithotripsy

Stone Cone device may help prevent stone migration, improve stone-free rate post-lithotripsy

FRIDAY, Jan. 21 (HealthDay News) -- Two ureteral occlusive devices, the Stone Cone and the entrapment net (N-Trap), have been found to be effective in reducing complications associated with pneumatic lithotripsy. The Stone Cone proved more effective at preventing proximal stone migration, according to a study published in the January issue of Urology.

Yasser A. Farahat, M.D., of Tanta University in Egypt, and colleagues compared the safety and efficacy of the Stone Cone and N-Trap in a study of 195 patients with proximal ureteric stones. The patients were randomized into one of three groups: pneumatic lithotripsy using the Stone Cone (Group I), using the N-Trap (Group II), or not using an occlusive device (Group III).

The researchers found that, although both devices effectively reduced the incidence of residual fragments, ureteral trauma, operative time, and the need for ureteral stenting compared with the control group, the Stone Cone group had a significantly lower incidence of retrograde stone migration and a greater stone-free rate at three weeks post-procedure. Auxiliary procedures were necessary in 4.76, 16.94, and 27.58 percent of the patients in groups I, II, and III, respectively.

"The Stone Cone was associated with a significantly lower rate of proximal stone migration during lithotripsy and a subsequently higher stone-free rate. It should be used during ureteroscopic treatment of proximal ureteral stone >1 cm in size," the authors write.

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