Mechanical Pressure Relief Valve for Quiet Breast Pump Control
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Solution Overview
Problem
Existing breastmilk expression systems face design complexity, increased cost, and noise issues due to solenoid valves, and performance limitations from piston-cylinder aperture designs, which hinder optimal pressure control.
Innovation Solution
A mechanical fluid pressure modification valve (MFLP-valve) is integrated into the system, made of expandable material with vents that open upon expansion, allowing for non-electric pressure relief and intake, and a flag for sensor detection to monitor system states, reducing complexity and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solenoid valve is used for pressure control, then pressure regulation function is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the electrical solenoid valve from the system and replaces it with a purely mechanical pressure control mechanism. The mechanical valve uses a spring-loaded plunger that responds directly to pressure differential to open or close the aperture, eliminating the need for electrical components and reducing system complexity while maintaining pressure regulation functionality.
Solution Approach 2:
The mechanical pressure control valve is self-actuating based on pressure differential. When pressure inside the chamber exceeds external pressure by a certain threshold, the valve automatically opens to relieve pressure. When pressure equalizes, the spring automatically closes the valve. This self-regulating mechanism eliminates the need for external control systems.
2Reliability
If a solenoid valve is used for pressure control, then pressure regulation function is achieved, but system cost increases
Solution Approach 1:
The patent replaces expensive electrical solenoid valves with inexpensive mechanical components such as springs, plungers, and elastomeric membranes. These simple mechanical parts are significantly cheaper to manufacture and assemble, reducing overall system cost while maintaining the essential pressure control function.
3Reliability
If a solenoid valve is used for pressure control, then pressure regulation function is achieved, but noise is generated
Solution Approach 1:
The patent substitutes the electromagnetic actuation system (solenoid) with a purely mechanical pressure-responsive system. The mechanical valve opens and closes based on pressure differential acting on the elastomeric membrane and spring force, eliminating electromagnetic noise and coil buzzing associated with solenoid operation.
4Reliability
If a piston-cylinder aperture design is used, then pressure relief is achieved, but overall system performance is limited
Solution Approach 1:
The patent implements a dynamic pressure control mechanism where the aperture size can vary based on pressure differential. The elastomeric membrane deforms elastically in response to pressure changes, allowing the aperture to open progressively as pressure increases, providing more nuanced and effective pressure control compared to fixed aperture designs.
Solution Approach 2:
The patent changes the physical state and properties of the aperture mechanism by using an elastomeric membrane that can deform elastically. This allows the aperture area to change dynamically based on pressure conditions, improving pressure control effectiveness and system performance compared to rigid fixed-aperture designs.
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 MFLP-valve provides efficient pressure control, minimizes repetitive friction on the nipple, and offers customizable tuning for precise fluid flow management, enhancing system performance and user experience.
Implementation Method 1
The MFLP-valve can be formed of an expandable material, and can be vented or selectively vented. For example, where the MFLP-valve is an expandable member, the expandable portions of the MFLP-valve can include one or more vents that only open upon expansion of the MFLP-valve
Data Source
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AI summary
A mechanical fluid pressure modification valve, or "MFLP-valve", is set forth. The MFLP-valve can be actuated upon movement of a movable pressure system member of a medical pressure system reaching a selected position. Additionally, the MFLP-valve can be actuated based on a pressure condition of the system. When the MFLP-valve unseals, a pressure differential between a pressure chamber and a volume outside of the chamber can be relieved. Disengagement of the movable pressure system member from the MFLP-valve can enable the MFLP-valve to re-seal. The MFLP-valve may include a flag that indicates the position of the movable pressure system member. The MFLP-valve may be provided in a diaphragm-type pressure source.