Self-Regulating Vent Assembly for Endoscope Pressure Management
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Solution Overview
Problem
Endoscopes and similar instruments face damage from positive and negative pressure differentials during air transport and cleaning/sterilization, leading to elastic fatigue and potential rupture, as existing seals do not effectively manage pressure changes.
Innovation Solution
A self-regulating vent assembly with a piston that moves between closed, first, and second positions in response to pressure differentials, allowing pressure to escape or be introduced into the compartment, using biasing members and gaskets to maintain predetermined pressure differentials and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the instrument remains sealed during normal operation, then cleaning and sterilization is simplified, but pressure differentials during air transport and cleaning/sterilization can cause elastic fatigue and potential rupture of flexible sheathing material
Solution Approach 1:
A vent assembly acts as an intermediary mechanism between the sealed instrument compartment and the external environment. The vent assembly includes a piston that can move between positions to either seal the compartment or allow pressure equalization, mediating between the need for sealing during cleaning and the need for pressure relief during transport.
Solution Approach 2:
The vent assembly transitions from a static sealed state to a dynamic pressure-regulating state. The piston can move between a first position (sealed) and a second position (vented), allowing the system to adapt its sealing characteristics based on operational requirements such as cleaning, sterilization, or air transport.
2Reliability
If a vent assembly is added to manage pressure differentials, then damage from pressure differentials is prevented, but device complexity increases
Solution Approach 1:
The vent assembly is designed to be self-regulating, using the pressure differential itself to drive the piston between sealed and vented positions. The biasing member provides automatic return to the sealed position, eliminating the need for external control systems or complex actuation mechanisms.
Solution Approach 2:
The vent assembly extracts only the necessary functionality from a complex pressure control system. By using a simple piston, biasing member, and gasket configuration, the design achieves pressure differential management without requiring complex sensors, actuators, or control electronics.
3Reliability
If the piston is designed to move between multiple positions, then pressure differentials are effectively regulated, but manufacturing precision requirements increase
Solution Approach 1:
The vent assembly incorporates inherent feedback through the biasing member that continuously monitors and adjusts piston position. When pressure differentials change, the piston moves to a position that balances the pressure forces, and the biasing member provides feedback to return the piston to the sealed position, automatically maintaining proper sealing without requiring precision positioning systems.
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 vent assembly effectively manages pressure differentials, preventing damage to the instrument by allowing controlled pressure release or introduction, thus protecting the instrument from elastic fatigue and rupture during varying environmental conditions.
Implementation Method 1
The piston is movable from a closed position to a first position and is also movable from the closed position to a second position. A positive pressure differential between the compartment and the environment that is greater than a first pressure differential moves the piston from the closed position to the first position.
Implementation Method 2
The first biasing member may have a compressive force that is greater than a compressive force of the second biasing member, thus making it easier to draw the piston towards the compartment relative to pushing the piston away from the compartment.
Data Source
AI summary
A vent assembly configured to maintain predetermined positive and negative pressure differentials between gas within a compartment and the environment, such as a compartment defining an interior of an endoscope is provided. The vent assembly includes a first housing having an upper vent and a lower vent coupled to the compartment. A piston is movable from a closed position to a first position, and from the closed position to a second position. In the closed position the piston blocks the upper and lower vents. A positive pressure differential moves the piston so as to open the vent to allow gas to escape from the compartment. A negative pressure differential draws the piston from the closed position to a second position to allow gas to enter the compartment.