CN201912069U - Portable pulse wave detector - Google Patents

Abstract

The utility model relates to a portable pulse wave detector on the basis of a piezoelectric sensor, which uses a singlechip as a core. The piezoelectric sensor converts jumping of pulse waves of an objected to be detected into a weak electric signal; a medical integrated amplifier is adopted to carry out primary and secondary signal amplification; a second order lowpass filtering circuit is used to remove spurious signals; the obtained signal is shaped; and then the signal is subjected to analog-to-digital conversion. A digital signal is compared for carrying out pulse wave counting by a software method. The pulse rate is displayed by a liquid crystal.

Description

Portable pulse detector

(1) Technical field

The utility model relates to the technical field of electronic medical equipment, in particular to a portable pulse detector.

(2) Background technology

The pulse contains a lot of important information reflecting the state of the human heart and blood vessels. Measuring the pulse is an important diagnostic tool for doctors. At present, a variety of medical instruments for collecting, recording and identifying pulse signals have been developed, such as wristband pulse measuring instruments using pressure sensors, pulse monitors using piezoresistive sensors, photoplethysmometers using photoelectric sensors, and microphones Pulse pick-up devices, pulse detection devices using ultrasonic Doppler detection technology, etc., and even pulse collection and analysis systems that use array sensors to simulate pulse cutting in traditional Chinese medicine. However, the existing pulse detection instruments are relatively expensive and bulky, and are only suitable for professional medical institutions such as hospitals.

(3) Contents of utility model

The utility model provides a portable pulse detector, which collects the pulse signal with a piezoelectric sensor, amplifies and processes it into a digital signal, and digitally displays the pulse number per minute on the liquid crystal screen, and can also display the pulse beating waveform, which is intuitive and low cost. low.

The portable pulse detector designed by the utility model includes a pulse signal sensor, a connected amplification processing circuit and a DC power supply. The pulse signal sensor is a piezoelectric sensor, and the amplification processing circuit includes an amplification circuit, a filter shaping circuit, and an analog-to-digital conversion circuit. , Single-chip microcomputer, the output terminal of the single-chip microcomputer is connected to the LCD screen. The output terminal of the piezoelectric sensor is connected to the amplifier circuit, and then connected to the single-chip microcomputer through the filter shaping circuit and the analog-to-digital conversion circuit, the single-chip computer is connected to the power supply, and its output terminal is connected to the LCD screen.

The piezoelectric sensor converts the pulse beating of the object to be detected into a weak electrical signal, and the weak electrical signal obtained by the sensor is sent to the amplifying circuit to obtain a regular pulse waveform; the amplifying circuit is connected to the filter shaping circuit to perform shaping to remove stray signals; The analog-to-digital conversion circuit converts the analog signal into a digital signal; the digital signal is sent to the single-chip microcomputer, and the software in the single-chip microcomputer compares the digital signal to calculate the number of pulse beats in one minute, and finally sends it to the LCD screen to display the pulse per minute of the measured object , or display the change curve of the pulse signal voltage, that is, the pulse beating curve.

The amplifying circuit, the filtering and shaping circuit, the analog-to-digital conversion circuit, and the single-chip microcomputer are integrated on the integrated circuit board, and the integrated circuit board and the DC power supply are installed in the shell of the tester. The piezoelectric sensor is close to the inner side of the bottom surface of the shell, and the bottom surface of the shell is placed on the artery of the subject to be detected during detection, such as the artery of the wrist, or neck, or arm, or leg, and can also be placed in front of the left chest. The top surface of the shell is embedded with a LCD screen, which is convenient for viewing the test results. The power switch button and the display selection button connected with the single-chip microcomputer are installed beside the top liquid crystal screen of the casing. Use the display selection button to select the LCD screen to display the pulse rate per minute, or to display the pulse beating curve.

The advantages of the portable pulse detector designed by the utility model are: 1. The liquid crystal display and the user have established a good interactive interface, and the error of the pulse count is not more than 1%, which can quickly and accurately measure the pulse frequency and heart rate, and is suitable for professional medical treatment Institutional use is also suitable for self-testing by patients and the elderly; 2. Less components are used, the structure is simplified, and it is easy to carry; 3. The work is stable and reliable, with less power consumption and energy saving; 4. It is easy to manufacture and cost-effective.

(4) Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a schematic diagram of the circuit structure of the embodiment of the portable pulse detector.

Fig. 2 is the schematic circuit diagram of the utility model

Figure 3 is the front view of the pulse detector

Figure 4 is a side view of the pulse detector

In the figure, 1. is the digital-to-analog conversion module, 2. the operational amplifier module, 3. the filter module, 4. the operational amplifier module,

5 single chip microcomputer, 6. liquid crystal display module

(5) Specific implementation methods

The circuit block diagram of the embodiment of the portable pulse detector is shown in Figure 1, including the pulse signal sensor and the connected amplification processing circuit and DC power supply. The pulse signal sensor is a piezoelectric sensor, and the amplification processing circuit includes an amplification circuit and a filter shaping circuit. , Analog-to-digital conversion circuit, single-chip microcomputer, and the output terminal of the single-chip microcomputer is connected to the LCD screen. The output terminal of the piezoelectric sensor is connected to the amplifier circuit, and then connected to the single-chip microcomputer through the filter shaping circuit and the analog-to-digital conversion circuit, the single-chip computer is connected to the power supply, and its output terminal is connected to the LCD screen.

The amplifying circuit adopts a medical integrated amplifier.

The filter shaping circuit adopts a second-order low-pass filter circuit.

The DC power source is a battery.

The integrated circuit board and the battery as the direct current are installed in the casing of the tester. The piezoelectric sensor is closely attached to the inner side of the bottom surface of the housing. The top surface of the shell is embedded with a LCD screen, which is convenient for viewing the test results. The power switch button and the display selection button connected with the single-chip microcomputer are installed beside the top liquid crystal screen of the casing.

The above-mentioned embodiments are only specific examples for further specifying the purpose, technical solutions and beneficial effects of the utility model, and the utility model is not limited thereto. All modifications, equivalent replacements, improvements, etc. made within the disclosed scope of the utility model are included in the protection scope of the utility model.

Claims (4)

1. A portable pulse detector, comprising a pulse signal sensor and a connected amplification processing circuit and a DC power supply, characterized in that: The pulse signal sensor is a piezoelectric sensor, and the amplification processing circuit includes an amplification circuit, a filter shaping circuit, an analog-to-digital conversion circuit, and a single-chip microcomputer; the output terminal of the piezoelectric sensor is connected to the amplification circuit, and then the single-chip microcomputer is connected to the filter shaping circuit and the analog-to-digital conversion circuit , the microcontroller is connected to the power supply, and the output terminal of the microcontroller is connected to the LCD screen. 2. The portable pulse detector according to claim 1, characterized in that: The amplification circuit, filter shaping circuit, analog-to-digital conversion circuit, and single-chip microcomputer are integrated on the integrated circuit board, and the integrated circuit board and the DC power supply are installed in the casing of the tester; the piezoelectric sensor is closely attached to the inner side of the bottom surface of the casing; the top surface of the casing is embedded The liquid crystal screen is installed, and the power switch button and the display selection button connected with the single-chip microcomputer are installed beside the liquid crystal screen on the top surface of the shell. 3. The portable pulse detector according to claim 1 or 2, characterized in that: The amplifying circuit is a medical integrated amplifier. 4. The portable pulse detector according to claim 1 or 2, characterized in that: The filter shaping circuit is a second-order low-pass filter circuit.

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