Foley Catheter Pistoning Prevention System
Solution Overview
Problem
Current Foley catheters made of stretchable materials like latex or silicone allow for significant longitudinal stretch, leading to inadvertent pistoning actions that facilitate bacterial migration and increased rates of catheter-associated urinary-tract infections (CAUTI), which are difficult to prevent with existing aseptic techniques and coatings.
Innovation Solution
A device, referred to as PPS, is integrated within the catheter body to bind the latex or silicone material and reduce longitudinal stretch, using anchoring eyelets made of flexible materials like polyethylene or nylon, thereby minimizing pistoning and bacterial transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stretchable materials like latex or silicone are used for the catheter body, then the catheter can accommodate patient movement and maintain comfort, but the catheter undergoes significant longitudinal stretch that causes pistoning action and facilitates bacterial migration
Solution Approach 1:
The catheter is divided into segments with different properties: a stretchable portion (latex or silicone) for comfort and a non-stretchable reinforced portion (with PPS and braided wire) for infection prevention. This segmentation allows each section to perform its specific function without compromising the other.
Solution Approach 2:
The catheter uses composite construction combining stretchable latex/silicone material with non-stretchable components including polypropylene/nylon braided wire and PPS (polypropylene mesh or fabric). This composite structure provides both flexibility and resistance to longitudinal stretching that causes pistoning.
2Object-affected harmful factors
If the catheter is secured to prevent pistoning, then bacterial migration is reduced, but the securing devices may cause misplaced attachment or entanglement that worsens pistoning
Solution Approach 1:
The PPS and anchoring eyelets are pre-integrated into the catheter body during manufacturing, creating a built-in anchoring system that eliminates the need for external securing devices. This preliminary integration ensures proper positioning and prevents entanglement issues associated with separate securing components.
3Object-affected harmful factors
If external securing devices are added to reduce stretch, then pistoning action is minimized, but the device complexity and risk of misplaced attachment increase
Solution Approach 1:
The anchoring function is merged with the catheter body itself through integrated PPS and eyelets, eliminating the need for separate external securing devices. This integration reduces overall device complexity while maintaining the anti-pistoning function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The PPS device significantly reduces the incidence of CAUTI by minimizing bacterial migration into the urinary system while maintaining lateral flexibility and comfort, by limiting the longitudinal stretch of the catheter within the urethra and reducing friction and bacterial contact.
Implementation Method 1
The pistoning action is due to a catheter being made of a stretchable latex or silicone which allows for significant longitudinal stretch, much like a rubber band, of up to >350% of its length
Data Source
AI summary
A pistoning prevention system (PPS) that will improve catheter associated urinary tract infection rates of an indwelling Foley catheter while maintaining reliability, comfort, & safety. With the PPS incorporated within a Foley catheter during manufacturing it will eliminate the excess stretch along a specific length of a Foley catheter that resides within the patient's urethra. The excessive amount and ease of stretch is responsible for the pistoning action of an indwelling Foley catheter moving in and out of the urethra. This action is responsible for the retrograde movement of bacteria outside the body & into the urethra, bladder, & kidneys increasing preventable infections. With much prevention work globally, the pistoning action of a Foley catheter is now known to be partially or wholly to blame for the attributed $340 million spent in the U.S. on healthcare costs & 13,000 associated deaths making this an immediate global patient safety emergency.