SPONSORED FEATURE Cover story
POWER SUPPLY DESIGN CONSIDERATIONS FOR PRIMARY CELL POWERED REMOTE PATIENT MONITORS
By Fahad Masood, member of Technical Staff, Analog Devices
Remote patient monitors (RPMs) are continuously evolving to include more features that enable doctors to gain greater insights into their patients’ health. These features create greater demands on the single-cell batteries that power the monitors. This article provides a power supply solution for an ECG remote patient monitoring patch that preserves battery life to take advantage of these features. The article also presents strategies to accurately estimate battery life for an RPM as well as ways to extend the battery life of the RPM before it is even powered on.
T 8
he Internet of Things (IoT) revolution has allowed for a paradigm shift in the way healthcare providers leverage technology to provide their patients with real-time care. Today,
remote patient monitoring is an area where new medical devices are changing the way doctors interact with their patients. Smaller ICs and wireless communication have enabled decades old devices to be updated to enhanced functional form factors that increase patient adherence and outcomes. Replacing clunky Holter devices of the past, current remote patient monitoring patches include a variety of sensors that gather heart rate, temperature, and accelerometer data. These patches transmit patient data to the cloud allowing patients and doctors to access the data in real time.
While these devices are increasing the ability for doctors to provide better care, they pose challenges for power supply designers who must balance system performance and battery life requirements. The challenges increase further as second- generation patches adopt multimodal sensing to improve accuracy and efficacy, which, in turn, increases the demands on the power supply. In this article, we will refer to the ECG RPM patch example shown in Figure 1. This patch continuously monitors the ECG and accelerometer while checking the temperature every 15 minutes. The data are transmitted via Bluetooth Low Energy (BLE) once every two hours for a total of 12 BLE transactions per day. This patch incorporates three different modes each with distinct load profiles: standard monitoring, temperature monitoring,
Figure 1. ECG patch power supply diagram. A 235 mAh CR2032 lithium coin cell battery provides power to the voltage regulators, microcontroller, ECG front end, temperature sensor, and accelerometer.
August 2023 Instrumentation Monthly
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82
