Porous Filter Cap for Endoscope Pressure Equalization
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Solution Overview
Problem
Endoscopes are prone to damage due to pressure differentials during sterilization and shipping, and existing pressure compensation caps often allow fluid ingress during wet sterilization processes, leading to unnecessary returns for evaluation and repair, as users may mistakenly use the wrong cap for different processes.
Innovation Solution
A pressure compensation cap with a filter made from a material that allows gases to pass through while preventing liquids, such as water or sterilization fluids, from entering the endoscope, ensuring pressure equalization without fluid ingress, and designed to remain in place during wet sterilization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure compensation cap with open holes is used to equalize pressure during sterilization and shipping, then pressure differentials are relieved, but liquids can enter the endoscope causing fluid ingress
Solution Approach 1:
The cap incorporates a porous filter material that allows gas molecules to pass through via diffusion and pressure-driven flow while blocking liquid molecules due to surface tension effects. The porous structure provides interconnected voids at the micrometer scale that permit gas permeation but prevent liquid penetration, resolving the contradiction between pressure equalization and fluid ingress prevention.
Solution Approach 2:
The filter acts as an intermediary component between the external environment and the endoscope interior. It mediates the interaction between pressure equalization and fluid protection by selectively transmitting gases while blocking liquids, allowing the cap to perform both functions simultaneously without requiring multiple separate caps.
2Reliability
If multiple separate caps are provided for different sterilization processes, then the correct cap can be selected for each process, but device complexity and user error increase
Solution Approach 1:
The cap is designed with multi-functionality by integrating both pressure equalization and liquid blocking capabilities into a single device. The porous filter enables the same cap to be used across different sterilization processes (dry heat, moist heat, chemical sterilization) and storage conditions, eliminating the need for multiple process-specific caps and reducing user error.
Solution Approach 2:
The invention merges the functions of pressure compensation and liquid protection into a single integrated cap design. By combining the pressure equalization feature (openings for gas flow) with the liquid barrier feature (porous filter), the design consolidates what previously required multiple separate caps into one universal component.
3Object-affected harmful factors
If a water resistant cap is used during vacuum sterilization, then fluid ingress is prevented, but pressure differentials cause damage to endoscope components
Solution Approach 1:
The porous filter material provides selective permeability that allows pressure equalization while maintaining liquid barrier properties. During vacuum sterilization, the porous structure permits pressure equalization to prevent component damage while its surface tension characteristics block liquid penetration, resolving the contradiction between preventing fluid ingress and protecting against pressure differentials.
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 cap effectively equalizes pressure between the interior and exterior of the endoscope, preventing fluid ingress and reducing damage from pressure differentials, while allowing gases to pass through, thus reducing the need for multiple caps and minimizing returns for repair.
Implementation Method 1
a filter occluding the hole and made from a material which permits gas to pass through the filter and which prevents the liquid from passing through the filter
Implementation Method 2
a filter occluding the hole and made from a material which permits gas to pass through the filter and which prevents the liquid from passing through the filter
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pressure compensation cap, system, and method for equalizing pressure in an endoscope while preventing a liquid from entering an interior of the endoscope through an opening. The cap is adapted to fit over an opening in the endoscope and includes a hole occluded by a filter. The filter is made with a material which allows certain gasses to pass through the cap into or out of the endoscope while preventing certain liquids from passing through at certain pressures and temperatures. The liquids, gasses, pressures, and temperatures may include those typically encountered when sterilizing an endoscope, those typically encountered during transport of an endoscope by air or otherwise, or those encountered at any time during the lifecycle of an endoscope. ( Fig 1 )