Mechanical Safety Valve Venting for Breast Pump Over-Vacuum
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Solution Overview
Problem
Conventional lacteal extraction pump systems lack a mechanical safety valve within the fluid flow path to prevent over-vacuum conditions, which can cause discomfort and potentially harm lactating mothers.
Innovation Solution
A mechanical safety valve system is integrated within the fluid flow path of the pump system, automatically actuated to reduce vacuum levels by altering its geometry and allowing communication with atmospheric pressure when an over-vacuum condition is detected, using a combination of material thickness, properties, and design features such as ribs to prevent the valve from being pulled into the flow unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical safety valve system is integrated within the fluid flow path to automatically reduce vacuum levels, then the reliability and safety of the pump system is improved, but the device complexity increases
Solution Approach 1:
The mechanical safety valve system is designed to automatically detect and respond to over-vacuum conditions without requiring external control systems. The valve mechanism self-regulates by utilizing the pressure differential itself to actuate the safety response, thereby improving reliability while avoiding the complexity of electronic controls or external monitoring systems.
Solution Approach 2:
The patent introduces a mechanical intermediary valve system positioned within the fluid flow path that mediates between the vacuum source and the fluid being extracted. This intermediary component provides a safety function by mechanically limiting the maximum vacuum level, resolving the contradiction by adding a focused safety mechanism rather than complicating the entire system.
2Ease of operation
If the valve is designed to automatically vent excess vacuum by altering its geometry, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The valve is designed to automatically change its geometric parameters (opening area, flow path) in response to pressure differential changes. The valve geometry is configured so that at normal operating vacuum levels, the valve maintains a sealed position, but when the vacuum exceeds a predetermined threshold, the pressure differential automatically alters the valve's effective geometry to vent excess vacuum. This parameter change approach enables automatic operation while the manufacturing precision is focused on critical dimensions that define the venting threshold.
3Reliability
If material thickness and properties are optimized to prevent the valve from being pulled into the flow unit, then the reliability is improved, but the weight of the valve increases
Solution Approach 1:
Rather than uniformly increasing the weight of the entire valve assembly, the patent applies enhanced material thickness and strengthened properties specifically at critical locations where the valve is most susceptible to being pulled into the flow unit under over-vacuum conditions. This localized reinforcement approach maintains reliability by preventing catastrophic failure while minimizing the overall weight increase of the moving valve components.
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 solution effectively reduces the risk of over-vacuum conditions, enhancing user comfort by automatically venting excess vacuum and maintaining efficient milk extraction, while allowing for adjustable vacuum ranges based on user feedback.
Implementation Method 1
allowing communication with atmospheric pressure when an over-vacuum condition is detected
Implementation Method 2
automatically actuated to reduce vacuum levels by altering its geometry
Data Source
Figure 1~1A
Figure 2~3B
Figure 3C~3D
AI summary
The disclosure is directed to a mechanical over-vacuum safety system and method of use for a vacuum pump system designed to extract milk from lactating mothers. The over-vacuum safety system includes at least one mechanical safety valve configured to reduce a vacuum in the pump system given an over-vacuum condition. The mechanical safety valve(s) may be automatically actuated in response to specific vacuum ranges, such as an over-vacuum conditions ranging between negative 350 mmHG to negative 300 mmHG. The mechanical safety valve may allow fluid flow by folding.