Breast Pump RF Heating Synchronized With Vacuum Cycles
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Solution Overview
Problem
Existing breast pumps often fail to provide efficient and comfortable milk expression due to challenges in implementing tissue heating, particularly with RF heating, which can result in hot spots and discomfort due to varying skin contact during the cyclic pressure waveform.
Innovation Solution
A breast pump with an RF heating system that coordinates heating timing with the pressure profile, ensuring effective contact during negative pressure to avoid hot spots, using RF signals and electrodes integrated with the breast shield, controlled by a controller that synchronizes heating with the vacuum cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If RF heating is applied continuously to the breast during pumping, then warmth and comfort are improved, but hot spots and discomfort occur due to varying skin contact during the cyclic pressure waveform
Solution Approach 1:
The RF heating is applied periodically in synchronization with the pumping cycle. The controller activates RF heating only during phases when adequate skin contact is detected (when the breast is pressed against the breast shield by negative pressure), and deactivates it when contact is insufficient. This periodic application ensures warmth during effective contact phases while avoiding hot spots during poor contact phases.
Solution Approach 2:
The system uses a sensor to detect skin contact quality in real-time and feeds this information back to the controller. Based on the feedback signal indicating adequate or inadequate contact, the controller dynamically adjusts RF heating activation. This closed-loop feedback mechanism ensures heating is applied only when safe and effective, preventing hot spots while maintaining comfort.
2Use of energy by moving object
If RF heating is applied during periods of inadequate skin contact, then energy efficiency is improved by avoiding unnecessary heating, but breast warmth and comfort are reduced
Solution Approach 1:
The system employs periodic RF heating synchronized with the pumping cycle phases. During phases of inadequate skin contact, RF heating is deactivated to avoid energy waste. During phases of adequate contact, RF heating is activated to provide beneficial warmth. This periodic on-off cycling optimizes energy usage while maintaining thermal comfort during effective heating windows.
Solution Approach 2:
The system automatically adjusts RF heating based on real-time detection of skin contact conditions without requiring user intervention. The sensor and controller work together to self-regulate heating activation, ensuring energy is applied only when physically effective (during adequate contact), thereby optimizing energy efficiency while maintaining comfort.
3Device complexity
If simple thermal conduction heating is used, then device complexity is reduced, but heating effectiveness and penetration are insufficient compared to RF heating
Solution Approach 1:
The system replaces simple mechanical thermal conduction heating (which would require complex insulation and contact mechanisms) with RF electromagnetic heating. RF signals can penetrate tissue directly without requiring prolonged skin contact or complex thermal management structures, achieving deeper and more uniform heating with simpler overall device architecture.
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 RF heating system enhances comfort and efficiency by providing consistent warmth during milk expression, avoiding hot spots and ensuring effective penetration without requiring extensive user preparation.
Implementation Method 1
an RF signal source for generating RF signals; an electrode arrangement for direct or indirect contact with the breast and to which the RF signals are supplied, for providing RF heating of the breast
Implementation Method 2
a pressure source for applying a pressure profile to a breast received in the breast shield
Implementation Method 3
a vacuum is applied such that milk is extracted
Data Source
AI summary
A breast pump comprises a breast shield, a pressure source for applying a pressure profile to a breast received in the breast shield and an RF signal source for generating RF signals. The RF signals are applied to an electrode arrangement to provide RF heating of the breast. The supply of the RF signals to the electrode arrangement, i.e. the heating, is controlled with timing which depends on the pressure profile. In this way, the heating is provided at times within the pressure profile when the heating function will be most effective, for example at times of maximum under pressure and hence suction of the breast tissue against the breast shield.