Mat for effective cardiopulmonary resuscitation. Free Technical Library News

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Mat for effective cardiopulmonary resuscitation

05.09.2019

Researchers at the Fraunhofer Institute in Germany have created a pressure-sensitive chest pad that will allow paramedics, first responders and other emergency workers to learn how to perform cardiopulmonary resuscitation faster and more efficiently.

The device was called Rescue Aid, and its main task is to help people who have to do cardiopulmonary resuscitation feel confident in their abilities and hone their first aid skills to restore the body's vital functions and bring it out of a state of clinical death.

Cardiopulmonary resuscitation includes chest compressions to a depth of 5-6 cm at a rate of 100-120 compressions per minute. During training, the strain sensors on the Rescue Aid chest pad will determine the force of pressing and their speed, so that in real life a first responder can correctly perform all the necessary actions.

The panel also beeps with every squeeze, essentially serving as a metronome to help users keep up the beat.

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The new digital pressure sensor Infineon DPS310 is capable of measuring atmospheric pressure with high accuracy, which allows it to be used in altimeters with a resolution of up to 5 centimeters. The DPS310 also provides a temperature value with an error of no more than +- 0,5 ° C, which makes it an excellent candidate for a weather station measuring unit. Due to the very low current consumption of 1,7 μA and the miniature size, the microcircuit can be used in portable battery equipment.

The sensing element of the sensor uses a capacitive measuring principle, which guarantees high accuracy over wide temperature changes. The internal signal processor converts the output signal from the pressure and temperature sensors into a digital code up to 24 bits wide. Each DP310 is individually calibrated, and the personal coefficients calculated during this process are stored in non-volatile memory. The calibration data is used by the application to convert measurements into temperature and pressure values with high accuracy.

The output data buffer FIFO can store up to 32 measurements, which allows you to reduce the speed of polling the sensor by the host processor. Measurement results and calibration factors are available via I2C or SPI serial interface. The operation of the encoder can be monitored via status bits or an interrupt signal can be used, which can be issued on the SDO line.

Features of DPSZ10:

Working range: Pressure: 300 - 1200 hPa. Temperature: -40 - 85 °C
Pressure Sensor Accuracy: +- 0,005 hPa (or +- 0,05 m) (high precision mode)
Relative error: +- 0,06 hPa (or +- 0,5 m)
Absolute error: +- 1 hPa (or +- 8 m)
Temperature measurement accuracy: +- 0,5 ° C
Temperature sensitivity by pressure measurement: 0.5Pa / K
Measurement time: Typical value: 27,6 ms for standard mode (16x). Minimum: 3.6 ms for low precision mode
Average current consumption: 1,7uA for pressure measurement, 1,5uA for temperature measurement (@ sampling rate 1Hz), standby: 0,5uA
Supply voltage: VDD: 1,7 - 3,6 V; VDDIO: 1,2 - 3,6V
Operating modes: Command (manual), Background (automatic), Standby mode
Calibration: Individually calibrated with saving coefficients for measurement correction
FIFO: Stores up to 32 pressure or temperature measurements
Interface: I2C and SPI (both interruptable)
Enclosure: 8-pin LGA connector, 2,0mm x 2,5mm x 1,0mm.

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