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April 1, 2026Urology1 citationsOpen Access

Ureteroscopic Aspiration Dynamics and Stone Fragment Evacuation: In Vitro Comparison of the Second-Generation CVAC System and Direct In-Scope Suction

NCNicolas Corsi AGAshley N. Gonzalez BJB. Connor Johnson

Key Points

To evaluate and compare the performance of the second-generation CVAC aspiration system to that of direct in-scope suction devices.
Utilized synthetic stones sized 63 m-3.3 mm
Compared CVAC catheter with two DISS ureteroscopes of different sizes
Conducted standardized trials using an irrigation system at specified pressures
Measured aspiration efficiency, clearance success, and clogging incidence
Determined aspiration efficiency in grams per minute
Assessed clearance success within 180 seconds
Measured time to clearance using Kaplan-Meier analysis
Evaluated clogging incidence rates between systems

Abstract

Objective: To compare the aspiration efficiency and fragment evacuation performance of the second-generation CVAC aspiration system with direct in-scope suction (DISS) devices.Methods: Synthetic stones (Begostone) were sieved into five size groups (63 m-3.3 mm).The CVAC catheter (7 Fr lumen) was tested against two DISS ureteroscopes (Pusen 3.6 Fr and 5.1 Fr).Standardized trials were performed using a Thermedx irrigation system (160 mmHg) and Neptune suction (155 mmHg).Endpoints included aspiration efficiency (g/min), clearance success within 180 s, time to clearance (Kaplan-Meier analysis), and clogging incidence.

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