Breast Pump RF Heating Timed to the Suction Pressure Cycle
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Solution Overview
Problem
Existing breast pumps often lack efficiency and comfort 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 good electrode contact during negative pressure to avoid hot spots, using RF signals and electrodes integrated with the breast shield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If RF heating is applied continuously during breast pumping, then tissue warmth is improved, but hot spots and discomfort occur due to varying skin contact during cyclic pressure waveform
Solution Approach 1:
The RF heating system operates periodically in synchronization with the breast pump's cyclic pressure waveform. The controller activates RF heating only during phases when negative pressure is applied and the breast tissue is pressed against the electrode array, ensuring consistent contact. This periodic operation prevents continuous heating that would cause hot spots while maintaining effective tissue warmth during pumping phases.
Solution Approach 2:
The system incorporates a controller that monitors the pressure waveform in real-time and uses this feedback to regulate RF heating activation. By detecting when negative pressure is applied and when atmospheric pressure is restored, the controller dynamically adjusts heating timing to match contact conditions, preventing hot spots while ensuring effective heating during productive pumping phases.
2Temperature
If RF heating is applied during stimulation mode with high frequency waveform, then tissue warmth is improved, but heating effectiveness is reduced due to brief contact time
Solution Approach 1:
The RF heating system is synchronized to activate during the negative pressure phases of the cyclic waveform, regardless of frequency. This ensures that heating occurs precisely when contact is established, maximizing thermal transfer during the brief contact periods characteristic of stimulation mode while preventing heat loss during atmospheric pressure phases.
3Use of energy by moving object
If RF electrode array is integrated with breast shield, then heating efficiency is improved, but device complexity increases
Solution Approach 1:
The RF electrode array is integrated directly into the breast shield structure, combining the heating function with the existing mechanical component that contacts the breast. This merger eliminates the need for separate heating apparatus, reduces overall system complexity, and ensures automatic alignment of electrodes with breast tissue during pumping operations.
Solution Approach 2:
The breast shield is designed to serve multiple functions: mechanical containment of breast tissue, application of cyclic pressure waveform for milk expression, and delivery of RF heating through integrated electrodes. This multi-functionality reduces the number of separate components needed while improving overall system efficiency.
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 deeper tissue warmth without hot spots, making breast pumping more effective and comfortable.
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
Data Source
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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.