Novel syphon ureteral access sheath has potential to improve renal pressures and irrigant flow
Abstract
Objective
This paper describes a novel syphoning ureteral access sheath (UAS) intended for use during flexible uretero-renoscopy (URS). We aimed to assess if in vitro it could reduce intrarenal pressure (IRP) and increase irrigation flow compared to traditional UAS.
Methods
A validated phantom kidney with fiber optic pressure sensing capabilities was used to assess IRP. Standardized 80cm H20 irrigation via a ureterorenoscope was instilled through a traditional (11/13 Fr and 12/14 Fr) UAS and compared to the novel 11/13Fr syphoning UAS. Measured minute volume, calculated hourly flow volume and steady state IRP were compared.
Results
The traditional 11/13 Fr and 12/14 Fr UAS has statistically poorer irrigation flow compared to the novel syphoning UAS of 19,3 vs 29,3ml/min (p=0.0004) and 22,7 vs 29,3ml/min (p=0.0021) respectively. The steady state IRP were 20mmHg for the traditional 11/13Fr and 13mmHg for the 12/14Fr compared to 0mmHg for the novel UAS.
Conclusion
The described novel UAS is different from traditional devices by incorporating a syphon mechanism. Our in vitro assessment demonstrates that the novel UAS holds clinical potential to reduce IRP while allowing a significant increase in irrigant flow compared to larger diameter traditional UAS.