Hydrophilic Urinary Catheter Coating to Inhibit Bacterial Swarming
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Solution Overview
Problem
Urinary catheters often introduce bacteria into the urethra due to contamination during use, leading to urinary tract infections, especially in non-voiding patients, as urine flow is disrupted and urethral mucus viscosity is diluted by hydrophilic coatings or lubricants, activating bacterial motility.
Innovation Solution
A urinary catheter with a hydrophilic coating and hydration medium containing a compound to retain or increase urethral mucus viscosity, using desiccants or thickening agents to maintain or enhance the urethral environment's viscosity, preventing bacterial swarming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydrophilic coating is applied to the catheter shaft to improve lubricity and reduce tissue damage, then patient comfort is improved, but the coating dilutes urethral mucus viscosity which activates bacterial motility and increases infection risk
Solution Approach 1:
The patent modifies the chemical composition parameters of the lubricating coating by incorporating viscousifying agents (polymers, glycerin, propylene glycol) into the hydrophilic coating formulation. This changes the rheological properties of the coating to maintain higher viscosity in the urethral environment, thereby reducing bacterial motility activation while preserving lubricity benefits
Solution Approach 2:
The patent creates a composite lubricating coating material that combines hydrophilic polymers with viscousifying agents. This composite material provides both the lubrication properties needed for comfortable insertion and the viscosity-maintaining properties needed to inhibit bacterial motility, resolving the contradiction between comfort and infection risk
2Object-affected harmful factors
If lubricants are applied to the catheter surface to reduce soft tissue damage, then tissue trauma is reduced, but urethral mucus viscosity is diluted which promotes bacterial swarming toward the bladder
Solution Approach 1:
The patent changes the physical-chemical parameters of the lubricant by formulating it with high-viscosity components and viscousifying agents. This modification allows the lubricant to provide tissue protection while maintaining sufficient viscosity to prevent bacterial swarming, thus resolving the contradiction between reducing tissue damage and preventing bacterial introduction
3Productivity
If urine flow is disrupted by catheter insertion, then continuous bladder drainage is achieved, but urethral flushing function is lost allowing bacteria to accumulate and increase infection risk
Solution Approach 1:
The patent introduces viscousifying agents as intermediary substances in the lubricating coating that serve dual functions: they maintain coating lubricity for comfortable insertion and create a viscosity barrier that inhibits bacterial motility. This intermediary substance compensates for the loss of natural urethral flushing function while maintaining drainage efficiency
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 catheter design inhibits bacterial motility and reduces the risk of urinary tract infections by keeping bacteria static in the urethra, preventing them from traveling to the bladder.
Implementation Method 1
a hydrophilic coating on the catheter shaft (16); a hydration medium (18) for hydrating the hydrophilic coating
Implementation Method 2
the compound comprises a desiccant that removes moisture from the urethral mucus
Data Source
Figure 1~2
AI summary
Urinary catheters and methods for preventing bacterial infections.