Fetal Doppler Ultrasound Power Control for Longer Battery Life
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Solution Overview
Problem
Wireless fetal Doppler ultrasound transducers face challenges with high power consumption during prolonged monitoring sessions, leading to battery drain and potential interruptions, especially during extended labor.
Innovation Solution
Implementing a fetal sensor device (FSD) with an ultrasound transducer that alternates between transmit and receive periods, adjusts transmission power based on signal-to-noise ratio (SNR), and employs a sleep mode to minimize power consumption, while maintaining accurate fetal heart rate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless FSDs use continuous transmission to maintain signal quality, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The system implements periodic transmission at controlled intervals rather than continuous transmission. The processor determines optimal transmission intervals based on fetal movement detection, allowing the ultrasound transducer to transmit signals periodically while maintaining adequate signal quality for FHR measurement, thereby reducing overall power consumption.
Solution Approach 2:
The transmission interval is made dynamic rather than fixed. The system continuously monitors fetal movement and adjusts transmission intervals in real-time - increasing transmission frequency when fetal movement is detected (to maintain signal quality) and reducing intervals when no movement is present (to conserve power), thus adapting to changing conditions.
2Reliability
If wireless FSDs transmit data continuously to ensure accurate FHR monitoring, then reliability is improved, but battery life decreases
Solution Approach 1:
The system uses periodic transmission with variable intervals based on fetal activity. During periods of fetal movement, transmission occurs more frequently to maintain monitoring reliability. During quiescent periods, transmission intervals are extended, preserving battery life while still ensuring accurate FHR capture when needed.
Solution Approach 2:
The system incorporates feedback mechanisms where the processor monitors signal quality and fetal movement patterns, then adjusts transmission timing accordingly. This closed-loop control ensures reliable FHR monitoring by increasing transmission when signal quality degrades or movement occurs, while reducing transmission during stable conditions to extend battery life.
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
Extends battery life and reduces overheating by optimizing power usage without compromising signal fidelity, allowing for longer uninterrupted monitoring sessions.
Implementation Method 1
A doppler-based FHR monitoring system is a non-invasive FHR monitoring system that utilizes the Doppler effect to detect changes in as well as the absolute value of the FHR. The Doppler effect is a change in frequency or wavelength of a wave (in this case, ultrasound waves) when the source of the wave and the observer are in relative motion.
Implementation Method 2
The transducer emits sound waves (ultrasound waves) that travel through the mother's tissues and into the uterus. When these ultrasound waves encounter the fetal heart, they are reflected back toward the transducer.
Data Source
AI summary
Techniques for reducing power consumption by fetal ultrasound transducers are provided. In an example, a fetal sensor device (FSD) comprising a processor, controls operations an ultrasound transducer of the FSD in accordance with a power optimization protocol that results in minimizing power consumption by the FSD, wherein the ultrasound transducer is configured to measure one or more fetal parameters of a fetus using doppler based ultrasound technology, wherein the FSD operates in an active mode that comprises alternating between transmit periods wherein the ultrasound transducer transmits ultrasound signals, and receive periods wherein the ultrasound transducer measures reflected signals of the ultrasound signals that are received by the ultrasound transducer during the receive periods, and wherein the controlling comprises controlling a transmission power of the ultrasound signals and/or a duration of the transmit periods during the active mode in accordance with the power optimization protocol.