Press-Down Valve Catch Mechanism for Medical Instrument Cleaning
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Solution Overview
Problem
Press-down valves in medical instruments are difficult to clean due to a pretensioned spring that keeps the valve stem in a closed position, making it hard to access the valve body for flushing and cleaning, and they cannot be automatically cleaned or sterilized once dismantled from the instrument.
Innovation Solution
A press-down valve with a one-handed actuation element that overrides the spring force to open the valve stem, and a catch mechanism that locks the valve stem in the open position only when the valve is removed from the instrument, allowing for easy cleaning and automatic release upon reinstallation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pretensioned spring permanently presses the valve stem into the closure position, then the valve remains reliably closed and prevents leakage, but it becomes extremely difficult to clean the valve body because the valve stem cannot be moved to the open position
Solution Approach 1:
The catch mechanism transforms the static closed position into a dynamically lockable open position. When cleaning is needed, the valve stem can be moved to the open position and locked there by the catch mechanism, allowing cleaning liquid to flush through the valve body. The spring remains pretensioned to ensure reliable closure when not locked, while the catch mechanism temporarily overrides this for cleaning purposes.
Solution Approach 2:
The catch mechanism acts as an intermediary between the pretensioned spring and the valve stem. It allows the spring to maintain its closing force while providing a means to temporarily overcome this force for cleaning. The catch mechanism mediates between the conflicting requirements of maintaining closed position reliability and enabling open position accessibility for cleaning.
2Volume of moving object
If the press-down valve is kept small with dimensions of only a few centimeters, then it is compact and easy to handle, but it becomes very difficult to hold in the open position with one hand while carrying out irrigation
Solution Approach 1:
The catch mechanism provides self-service functionality by automatically locking the valve stem in the open position once activated. The user only needs to initially move the valve stem to the open position, and the catch mechanism self-locks it there, freeing the user's hand for irrigation tasks. This eliminates the need for continuous one-handed pressure to maintain the open position.
3Reliability
If the valve stem is permanently pressed into the closure position by spring force, then the valve maintains its press-down function, but automated irrigation/cleaning cannot be performed after dismantling because flushing in the open position is not possible
Solution Approach 1:
The catch mechanism enables preliminary action by allowing the valve stem to be locked in the open position before cleaning or sterilization processes begin. This preliminary locking action prepares the valve for automated cleaning systems by ensuring the valve body remains in the open position throughout the cleaning cycle, allowing cleaning liquid to effectively flush through all internal surfaces.
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
Enables easy cleaning and sterilization of the press-down valve by allowing the valve stem to be locked in the open position for cleaning and automatically releasing when reinstalled, ensuring the valve functions correctly as a press-down valve without locking, simplifying the handling and maintenance process.
Implementation Method 1
a pretensioned spring permanently pressing the valve stem into a closure position closing a flow through the valve
Data Source
AI summary
A press-down valve is provided for medical instruments for suction and irrigation and a medical instrument having installed such a press-down valve. A valve stem is pressed permanently into a closure position via a pretensioned spring. For actuation, the valve stem is moved counter to the force of the spring via an actuation element, and, after release, the spring presses the valve stem back into the closure position. A catch mechanism is provided by means of which the valve stem can be locked in the open position only when the press-down valve has been removed from the medical instrument, and that, when it is installed in the medical instrument, the catch mechanism is automatically released and remains released.