Context-Sensitive Flow Interrupter for Urinary Drainage
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Solution Overview
Problem
Current urinary catheter and drainage bag systems face challenges with urine backflow and backpressure, leading to urinary tract infections and discomfort, due to the formation of loops in the drainage tubing that create airlocks and trapped air pockets, which resist urine flow and cause pressure buildup in the bladder.
Innovation Solution
A context-sensitive flow interrupter and drainage outflow optimization system that includes a holding device with a normally closed clamp on the drainage tube to prevent backflow when the bag is above the bladder and a mechanical template to shape the tube for a monotonic downward gradient, along with a venting system to equalize pressures and prevent loop formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drainage bag is placed above the bladder level, then the collection bag can be positioned conveniently and prevented from protruding, but urine backflow to the bladder occurs due to gravity
Solution Approach 1:
A flow interrupter device is introduced as an intermediary component in the drainage tube between the bladder and collection bag. This device includes a float that automatically blocks the drainage lumen when the bag is positioned above the bladder, preventing backflow while allowing convenient bag placement. The float mechanism acts as a mediator that senses bag position and controls flow accordingly.
2Adaptability or versatility
If loops are formed in the drainage tubing, then the tubing can accommodate movement and positioning, but airlocks and trapped air pockets form that resist urine flow and cause backpressure
Solution Approach 1:
Air pockets and airlocks are extracted or removed from the drainage system by providing multiple air vents that allow trapped air to escape. The vents are positioned to capture air pockets that form in loops, preventing them from creating backpressure. This extraction of harmful air elements maintains tubing flexibility while eliminating flow resistance.
Solution Approach 2:
The drainage tube incorporates porous sections or hydrophobic membranes that allow air to pass through while blocking urine. This enables air pockets in loops to dissipate without compromising urine flow, maintaining tubing adaptability while improving flow rate by eliminating airlock obstructions.
3Productivity
If a normally open clamp is used to allow free urine flow, then drainage is unobstructed, but backflow prevention requires additional manual intervention
Solution Approach 1:
The flow interrupter device provides self-service backflow prevention through an automatic float mechanism. When the collection bag is positioned above the bladder, the float rises and automatically blocks the drainage lumen without requiring manual intervention. When the bag is below the bladder, the float descends and opens the lumen for free flow. This self-actuating system maintains drainage efficiency while eliminating the need for manual clamp operation.
4Productivity
If the drainage tube is kept straight without loops, then airlocks are minimized, but the tube cannot accommodate patient movement and positioning
Solution Approach 1:
The drainage tube is designed with differentiated local qualities: sections near the bladder connection maintain a straight configuration to prevent airlocks, while distal sections incorporate flexibility and loop-forming capability to accommodate patient movement. Air vents are strategically positioned in specific locations to address air trapping in flexible sections, allowing the tube to have both flow efficiency and positioning adaptability in different regions.
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 system effectively inhibits urine backflow and minimizes backpressure, reducing the risk of urinary tract infections and improving urine outflow by ensuring unobstructed flow and equalizing pressures within the drainage system.
Implementation Method 1
a venting system to equalize pressures and prevent loop formation
Implementation Method 2
a holding device with a normally closed clamp on the drainage tube to prevent backflow when the bag is above the bladder
Implementation Method 3
a mechanical template to shape the tube for a monotonic downward gradient
Data Source
AI summary
Embodiments of the invention provide methods and devices for improved drainage systems and tubing. In one embodiment, a context-sensitive flow interrupter is provided that inhibits or facilitates flow of fluid when engaged with a mating holder. In another embodiment, outflow is optimized through control of the pressure in gas pockets in a tube, drainage tube or assembly. In one such embodiment, gas pockets are vented to inhibit excessive back-pressure or suction on an organ, vessel or cavity being drained. In another such embodiment, loops in the tubes are avoided by using a mechanical template in the form of a groove or peg assembly to thread the slack in the drainage tube to generate a monotonic gradient. In another embodiment, such as for active drainage systems, a bypass channel is provided that allows an applied vacuum to go around an obstruction created by the collection of fluid in an undrained dependent loop.