Oleamide-Modified Valve Stem Torque Control
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Solution Overview
Problem
Urostomy pouch valves experience increased torque requirements over time due to the migration of silicone oil lubricants, leading to valve sticking and difficulty in operation for users, especially after extended storage periods.
Innovation Solution
Incorporating oleamide into the polymeric material of the valve stem and body, with concentrations between 0.1 wt.% to 5 wt.%, particularly 1.5 wt.% to 2 wt.% oleamide in combination with HDPE or other polyethylene-based polymers, to maintain low torque values throughout the valve's life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone oil is applied topically to the valve stem and body to reduce friction, then initial torque is sufficiently low, but after extended storage the lubricant flows away leaving dry spots that significantly increase torque and cause valve sticking
Solution Approach 1:
The lubricant (silicone oil) is applied in advance during the molding process to create a pre-lubricated valve assembly. The lubricant is incorporated into the polymer material before the valve components are formed, ensuring lubrication is present from the start and maintains consistency throughout storage and use.
Solution Approach 2:
The patent changes the concentration parameter of the lubricant within the polymer matrix, specifying 0.1 wt.% to 5 wt.% silicone oil content. This optimized concentration range ensures sufficient lubrication is maintained throughout the valve's lifecycle without excessive lubricant that could cause other issues.
Solution Approach 3:
The valve components are made from a composite material consisting of polymer (such as polyethylene, polypropylene, or polyester) combined with silicone oil lubricant. This composite structure allows the lubricant to be distributed and retained within the material matrix, preventing migration and dry spot formation during storage.
2Ease of operation
If a polymeric compound containing silicone oil is used to form the valve stem, then low torque is maintained throughout storage and use, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the lubrication function with the structural polymer material by combining silicone oil with common valve materials such as polyethylene, polypropylene, or polyester. This integration allows a single molding process to produce both the structural component and the lubrication system simultaneously, eliminating separate lubrication steps.
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 use of oleamide in the valve's material structure ensures a consistently low torque of 0.5 in·lbs to 2.0 in·lbs, even after one month of storage and throughout its usage, facilitating easy and comfortable operation of the valve.
Implementation Method 1
a polymeric compound comprising oleamide... maintain a low torque even after an extended period of time in storage and throughout the life of the valve
Data Source
AI summary
A valve for a pouch for collecting biological fluids includes a valve stem, at least a portion of which is formed from a polymeric material including oleamide.