Urinary Catheter Dependent Loops as a Potential Contributing Cause of Bacteriuria: An Observational Study

Wuthier, Phil; Sublett, Karen; Riehl, Lance

doi:10.7257/1053-816x.2016.36.1.7

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Tubing diameters might also have an adverse effect on the formation of dependent loops, which can occur when the routing of the tubing connected from the catheter drops lower than the collection bag hung on the bed-end (forming a looped path) -a common issue in hospitalised patients, where urine can accumulate and be trapped with air in a drainage system. 15,16 These aspects would warrant further research and would benefit from input from clinicians and catheter users. The computational study performed to study the effect of tube geometry on kinking behaviour showed that a reduced lumen diameter, and thicker drainage tubes, would generally improve the tube resistance to kinking and collapse that may obstruct flow.…”

Section: Resultsmentioning

confidence: 99%

An engineering approach towards a more discrete and efficient urinary drainage system

Marzo

Melis

Unger

et al. 2018

Proc Inst Mech Eng H

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Modern urinary catheter-to-leg-bag systems suffer from a number of shortcomings. Drainage tubing of current urinary leg bags is perceived as unnecessarily bulky compared to the indwelling catheters to which it is connected, and catheter designs are prone to the formation of biofilms, leading ultimately to encrustation and blocking. We used analytical and experimental engineering methodologies, aligned with current international (International Standards Organisation) and European standards, to optimise drainage tube size and flow efficiency and characterise tube kinking behaviour. Using computational fluid dynamics, we studied the influence of modern Foley catheter design on urodynamics and explored its potential influence on biofilm formation and encrustation. Results indicate that tubing diameters could be reduced by 40%-50% and still satisfy current International Standards Organisation flow rate standards for leg bags; this might also reduce the likelihood of tube kinking. The computational study showed how current catheter design may promote the development of lower velocity recirculating flows and high shear in proximity of regions known to be affected by bacterial adhesion and biofilm formation. If confirmed, these findings will give manufacturers greater flexibility to develop less obtrusive and more encrustation-resistant products for end users.

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Section: Resultsmentioning

confidence: 99%