Table 1. Currently available flexible ureteroscope models.
| Model | Manufacturer, country | Optical/digital | Tip diameter (Fr) | Proximal shaft diameter (Fr) | Primary deflection up/down (degrees) | Instrument channel diameter (Fr) | Special features |
|---|---|---|---|---|---|---|---|
| DUR-8 Elite | Gyrus ACMI, USA | Optical | 8.7 | 9.3 | 170/180 | 3.6 | Secondary deflection |
| URF-P5 | Olympus, Japan | Optical | 5.3 | 180/275 | 3.6 | Evolution tip | |
| Flexvision U500 | Stryker, USA | Optical | 6.9 | 275/275 | 3.6 | ||
| Invisio DUR-D | Gyrus ACMI, USA | Digital | 8.7 | 250/250 | 3.6 | ||
| Viper | Wolf, Germany | Optical | 6.0 | 8.8 | 270/270 | 3.6 | |
| Flex-X2 | Karl Storz, Germany | Optical | 7.5 | 270/270 | 3.6 | Photodyna-mic diagnosis enabled | |
| DUR-8 Ultra | Olympus | Optical | 8.6 | 270/270 | 3.6 | ||
| Flex-Xc | Karl Storz, Germany | Digital | 8.5 | 270/270 | 3.6 | ||
| URF-V | Olympus, Japan | Digital | 8.5 | 180/275 | 3.6 | NBI enabled | |
| Cobra | Richard Wolf, Germany | Optical | 6.0 | 9.9 | 270/270 | 3.3* | *Two instrument channels |
| 11274AA | Karl Storz, Germany | Optical | 7.5 | 8.7 | 170/120 | 3.6 |
Fr, francium; NBI, narrow-band imaging. *, refers to the quoted Fr gauge 3.3 for a ‘dual channel’ configuration-the Cobra ureterosope has 2 separate channels each of size 3.3 Fr.