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Battery-less Biomedical Signal Acquisition

IP.com Disclosure Number: IPCOM000202143D
Original Publication Date: 2010-Dec-06
Included in the Prior Art Database: 2010-Dec-06
Document File: 5 page(s) / 142K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

The continuous and simultaneous measurement of human breath rate and heart signal supports physicians in better diagnosis for patients with various diseases. Currently, multiple state of the art systems are known which are capable of measuring various vital functions. Although some of these systems are built for continuous mobile medical data acquisition, they tend to get bulky. This is primarily because such systems comprise more than one wearable unit which is often dependent on wired sensors and a battery based power supply. In the following a novel system for medical data acquisition is proposed where two separate sensors are used to measure a patient’s breath and heart rate simultaneously. The one sensor measuring the breath rate can be a MEMS (Micro-Electro-Mechanical System) based accelerometer sensor while the other sensor measuring the heart rate is an acoustic based sensor. The sensor output of the proposed system is pre-processed and transmitted to a signal conditioning receiver unit, where suitable signal processing is performed to calculate the breath rate and the heart rate. The power supply for the proposed sensor module is ensured through wireless power transmission. The proposed setup can be realized in a system on the chip architecture for both the transmitting and the receiving module, providing an integrated solution for the complete system. A detailed description of each module of the proposed system is given by the following sections.

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Battery-less Biomedical Signal Acquisition

Idee: Chinmayee Agnihotri, IN-Bangalore; Kumar Gupta Goutam, IN-Bangalore

The continuous and simultaneous measurement of human breath rate and heart signal supports physicians in better diagnosis for patients with various diseases. Currently, multiple state of the art systems are known which are capable of measuring various vital functions. Although some of these systems are built for continuous mobile medical data acquisition, they tend to get bulky. This is primarily because such systems comprise more than one wearable unit which is often dependent on wired sensors and a battery based power supply.

In the following a novel system for medical data acquisition is proposed where two separate sensors are used to measure a patient's breath and heart rate simultaneously. The one sensor measuring the breath rate can be a MEMS (Micro-Electro-Mechanical System) based accelerometer sensor while the other sensor measuring the heart rate is an acoustic based sensor. The sensor output of the proposed system is pre-processed and transmitted to a signal conditioning receiver unit, where suitable signal processing is performed to calculate the breath rate and the heart rate. The power supply for the proposed sensor module is ensured through wireless power transmission. The proposed setup can be realized in a system on the chip architecture for both the transmitting and the receiving module, providing an integrated solution for the complete system. A detailed description of each module of the proposed system is given by the following sections.

The Sensor Module

The proposed sensor module consists of two sensors, a single chip analog transmitter module and a T/R module (Transmit/Receive module). Figure 1 shows a block diagram of the complete sensor module. The sensor S1 is the breath rate measuring sensor which is preferably a MEMS based accelerometer. The sensor S2 is a heart rate measuring sensor which is basically a condenser microphone. The proposed sensor module has an integrated analog transmitter module which consists of a charge amplifier A1, a microphone amplifier A2, and a multiplexer M1, transmitter and Wireless Power Receiver (WPR) module.

1. Location of the sensors

The appropriate location for the sensors to be placed on the human body can be determined through experimentation with the help of an expert physician. However, the proposed accelerometer sensor is to be placed on the second right intercostal space of the human body. The proposed acoustic based sensor is to be placed on the third or fourth intercostal region of the human body. Figure 2 depicts these locations.

2. Transmitting analog signals

The output of the microphone sensor is sent to a pre-processing stage wherein it is amplified by the MICrophone amplifier (MIC Amplifier). A Switched-Capacitor (SC) charge amplifi...