A photoelectric reflective pulse heart rate acquisition device with variable output threshold

Abstract

The invention discloses a photoelectric reflecting type pulse heart rate collecting device with changeable output threshold, and relates to a photoelectric type pulse heart rate collecting device in medical electronics. The device is composed of a housing and a circuit thereof, wherein the circuit comprises a LED (light-emitting diode), an optical receiver circuit, a low-pass filter circuit, an operational amplifying circuit and an output threshold changeable circuit, wherein the LED adopts green-light LED with peak wavelength of 515nm, is suitable for responding to skin shallow-part arteriole information and is suitable for extracting a pulse signal; the optical receiver circuit is composed of APDS-9300 and a peripheral circuit thereof; the low-pass filter circuit consists of RC filter circuits; the operational amplifying circuit adopts LMC6001, and is used for amplifying a millivolt-level signal to 3V; the output threshold changeable circuit is used for realizing control on an output signal; the output threshold variable circuit consists of a divider resistor, a program-control resistor, a comparator and an electronic switch. The photoelectric reflecting type pulse heart rate collecting device filters the interference of dicrotic wave without missing the collection of normal pulse waves, so that stability of heart rate non-contact measurement can be greatly improved.

Description

technical field [0001] The invention relates to a photoelectric pulse heart rate measuring device in medical electronics, in particular to a photoelectric reflective pulse heart rate acquisition device with a variable output threshold. Background technique [0002] Non-invasive monitoring technology is an important direction for the development of medical engineering in the future, and the human pulse signal contains rich physiological information, which has gradually aroused great interest of clinicians. There are three main traditional pulse measurement methods: one is to extract from the ECG signal; the other is to calculate the pulse heart rate from the fluctuation detected by the pressure sensor when measuring blood pressure; the third is the photoelectric volume method. The first two methods of extracting signals will limit the activity of the subject, and if used for a long time, it will increase the physical and psychological discomfort of the subject. As one of the...

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Problems solved by technology

The output of the circuit only converts the pulse signal into an electrical signal, and does not filter out the dicrotic wave, which requires the user to process it through a program, which makes it difficult to measure the heart rate.

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