CN208129994U - Pulse signal acquires Transmission System - Google Patents

Abstract

The utility model discloses a pulse signal acquisition and transmission experiment system, which mainly includes a pulse signal acquisition module, a microprocessor module, a wireless bluetooth communication module and a system power supply module, the pulse signal acquisition module is connected with the microprocessor module, and the microprocessor module It is connected with the wireless bluetooth communication module, and the system power module is respectively connected with the other three modules and provides power for them; the pulse signal acquisition module includes three kinds of pulse sensors and signal conditioning circuits; the pulse signal acquisition module includes piezoelectric film pulse sensors, penetrating Infrared pulse sensor and reflective infrared pulse sensor. Because the system adopts a modular design, the system is small in size and easy to carry, and the modules can be disassembled freely, which is helpful for students to understand the system, and is also conducive to the technical update of the modules and the reuse of results. Therefore, the utility model is very suitable for use in the innovative practice teaching of biomedical engineering specialty.

Description

Pulse signal acquisition and transmission experimental system

technical field

The utility model belongs to the technical field of teaching equipment for collecting pulse signals in biomedical engineering, in particular to an experimental system for collecting and transmitting pulse signals.

Background technique

Physiological parameter detection system is an important learning module for biomedical engineering major (medical instrument direction). The modular design is integrated into a test box. However, such teaching equipment can usually only complete confirmatory experiments.

As a basic physiological signal, the pulse wave can be further used to detect and analyze other physiological parameters such as cardiovascular parameters, heart rate variability, respiration, and blood pressure. Due to the non-invasive characteristics of pulse signal detection, it has a wide application prospect in practice. In recent years, cardiovascular parameter analysis and blood pressure measurement based on non-invasive pulse detection technology are also research hotspots.

With the advent of the "Internet +" era and the adoption of new teaching methods, traditional teaching equipment can no longer meet the requirements of innovative practical teaching. Therefore, designing a set of experimental equipment with the pulse signal as the teaching object and introducing the current new technology into the practical teaching to meet the needs of the current innovative practical teaching is very important for the cultivation of students' innovative practical ability. Class teaching equipment is very lacking.

Utility model content

The technical problem to be solved by the utility model is to provide a pulse signal acquisition and transmission experiment system with small size, convenient portability, modularization and easy technical update.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical proposals: the pulse signal acquisition and transmission experimental system mainly includes a pulse signal acquisition module, a microprocessor module, a wireless bluetooth communication module and a system power supply module, a pulse signal acquisition module and a microprocessor The microprocessor module is connected with the wireless bluetooth communication module, and the system power supply module is respectively connected with the other three modules to provide power for them; the pulse signal acquisition module includes three kinds of pulse sensors and signal conditioning circuits; the pulse signal acquisition module includes pressure Electric film pulse sensor, penetrating infrared pulse sensor and reflective infrared pulse sensor.

The signal conditioning circuit is mainly composed of an impedance converter, a 20HZ low-pass filter, a primary amplifier filter circuit, a secondary amplifier filter circuit, a low-pass filter and an amplifier circuit; The device, the secondary amplification and filtering circuit are connected with the microprocessor module, the penetrating infrared pulse sensor is connected with the microprocessor module through the primary amplification and filtering circuit, and the secondary amplification and filtering circuit is connected with the microprocessor module, and the reflective infrared pulse sensor is connected with the microprocessor module through the low-pass filter, The amplifying circuit is connected with the microprocessor module.

The microprocessor module mainly includes an MCU chip, and the MCU chip is respectively connected to a crystal oscillator circuit, a reset circuit, a buzzer circuit, an independent key circuit, an LED display circuit, a download circuit, and a matrix key circuit.

The penetrating infrared pulse sensor adopts the HRM-2104 type opposite infrared transmitting and receiving sensor; the reflective infrared pulse sensor adopts the PulseSensor module; the wireless bluetooth communication module adopts the 2.0 standard HC-05 bluetooth serial port module.

The impedance converter is composed of a 10M ohm voltage emitter follower; the secondary amplification and filtering circuit includes a first-order passive high-pass filter with a cut-off frequency of 0.5HZ and a first-order active low-pass filter with a cut-off frequency of 20HZ; MCU The chip is an enhanced 51-core single-chip microcomputer STC12C5A60S2 model.

Aiming at the problems existing in the existing pulse signal acquisition teaching equipment, the inventor designed and manufactured a pulse signal acquisition and transmission experimental system, which mainly includes a pulse signal acquisition module, a microprocessor module, a wireless bluetooth communication module and a system power supply module. The module is connected to the microprocessor module, the microprocessor module is connected to the wireless bluetooth communication module, and the system power supply module is connected to the other three modules to provide power for them; the pulse signal acquisition module includes three kinds of pulse sensors and signal conditioning circuits; The signal acquisition module includes a piezoelectric film pulse sensor, a penetrating infrared pulse sensor and a reflective infrared pulse sensor. The experimental system takes the pulse signal as the teaching object, introduces new technologies such as non-invasive measurement of blood pressure and non-invasive detection of cardiovascular parameters, and transmits the collected signals to The upper computer can be further used to analyze other physiological parameters such as blood pressure and cardiovascular parameters, which is conducive to the improvement of students' innovative practice ability and achievement output. Because the system adopts a modular design, the system is small in size and easy to carry, and the modules can be disassembled freely, which is helpful for students to understand the system, and is also conducive to the technical update of the modules and the reuse of results. Therefore, the utility model is very suitable for use in the innovative practice teaching of biomedical engineering specialty.

Description of drawings

Fig. 1 is a schematic structural diagram of the pulse signal acquisition and transmission experimental system of the present invention.

In the figure: 1 pulse signal acquisition module, 11 three kinds of pulse sensors, 12 signal conditioning circuit, 2 microprocessor module, 3 wireless bluetooth communication module, 4 system power supply module.

Detailed ways

Basic structure and function

As shown in Figure 1, the pulse signal acquisition transmission experimental system of the present utility model mainly comprises pulse signal acquisition module 1, microprocessor module 2, wireless bluetooth communication module 3 and system power supply module 4, pulse signal acquisition module and microprocessor module The microprocessor module is connected with the wireless bluetooth communication module, and the system power supply module is connected with the other three modules and provides power for them. The pulse signal acquisition module includes three pulse sensors 3 and a signal conditioning circuit 12 . The signal conditioning circuit is mainly composed of an impedance converter, a 20HZ low-pass filter, a primary amplifier filter circuit, a secondary amplifier filter circuit, a low-pass filter and an amplifier circuit.

The pulse signal acquisition module uses three common pulse sensors to realize pulse signal acquisition in three different ways, including piezoelectric film pulse sensors, penetrating infrared pulse sensors and reflective infrared pulse sensors. The piezoelectric film pulse sensor is connected to the microprocessor module through the impedance converter, 20HZ low-pass filter, and the secondary amplification and filtering circuit; the penetrating infrared pulse sensor is connected to the microprocessor through the primary amplification and filtering circuit, the secondary amplification and filtering circuit The module is connected, and the reflective infrared pulse sensor is connected with the microprocessor module through a low-pass filter and an amplifying circuit. in,

The piezoelectric film pulse sensor (referred to as the piezoelectric film sensor) adopts the SDT1-028K model. The signal output by the sensor first passes through an impedance transformer. The impedance converter consists of a voltage emitter follower with an impedance value of 10M ohms, which can change the high output impedance of the piezoelectric sensor into a low output impedance. The input signal is sent to an active second-order filter for filtering after being changed by impedance, and the cut-off frequency of the filter is 20HZ. The filtered signal is then input into a filter amplifier circuit, which realizes the functions of filtering and signal amplification. The circuit is powered by a single power supply, including a first-order passive high-pass filter with a cutoff frequency of 0.5HZ and a cutoff frequency of 20HZ. A first-order active low-pass filter with a magnification of 40 times in the same direction.

The penetrating infrared sensor adopts the HRM-2104 type opposite-beam infrared emitting and receiving sensor. The signal output by the sensor is sent to the microprocessor module after passing through the signal conditioning circuit. The signal conditioning circuit includes two stages of amplification and filtering circuits, and the circuit structures of the two stages of amplification and filtering circuits are the same. The amplification and filtering circuit is powered by a single power supply, including a first-order passive high-pass filter with a cut-off frequency of 0.5HZ and a first-order active low-pass filter with a cut-off frequency of 20HZ, and the amplification factor in the same direction is 40 times.

The reflective sensor uses the PulseSensor module. The module's amplifier circuit and sensor core components are integrated on an independent circuit board. The emission tube of the sensor adopts a green light-emitting diode AM2520ZGC09 with a wavelength of 525nm, and the photosensitive element of the receiving tube model is APDS-9008. The collected signal is filtered by a low-pass filter, and then passed through an amplifier circuit composed of an operational amplifier MCP6001 to amplify the signal by 331 times.

The minimum system circuit of the single-chip microcomputer in the microprocessor module mainly includes the MCU chip, and the MCU chip is respectively connected to the crystal oscillator circuit, the reset circuit, the buzzer circuit, the independent key circuit, the LED display circuit, the download circuit, and the matrix key circuit; the MCU chip is an enhanced 51-core microcontroller STC12C5A60S2 model. The microprocessor module receives the signal output by the pulse signal acquisition module, converts it into a digital signal, and sends it to the wireless bluetooth communication module.

The wireless bluetooth communication module adopts the 2.0 standard HC-05 bluetooth serial port module, which supports a very wide baud rate range: 4800~1382400, and the module is compatible with 5V or 3.3V single-chip microcomputer system, and can pass the collected pulse signal through Bluetooth transmission to the PC.

The above-mentioned modules are integrated on one board, and the integrated board is connected with the PC through the wireless bluetooth communication module.

Specific work process

The pulse signal acquisition module has three types of sensors. When collecting pressure pulse waves, the piezoelectric film pulse sensor is attached to the wrist; at your fingertips. The pulse wave fluctuations are converted into electrical signals by using the piezoelectric thin film electrodes to contact the wrist of the human body or the infrared transmitting and receiving tubes to contact the fingers. The collected pulse wave is amplified and filtered by the signal conditioning circuit, and then sent to the STC12C5A60S2 microcontroller. The AD module of the STC12C5A60S2 microcontroller converts the received original pulse wave signal into a digital signal. The STC12C5A60S2 single-chip microcomputer controls the wireless bluetooth communication module to transmit the digital pulse wave to the data terminal equipment such as PC or mobile phone. The collected signals can be displayed and analyzed on the data terminal equipment.

Claims (5)

1. A pulse signal acquisition and transmission experiment system is characterized by mainly comprising a pulse signal acquisition module, a microprocessor module, a wireless Bluetooth communication module and a system power module, wherein the pulse signal acquisition module is connected with the microprocessor module, the microprocessor module is connected with the wireless Bluetooth communication module, and the system power module is respectively connected with other three modules and provides power for the other three modules; the pulse signal acquisition module comprises three pulse sensors and a signal conditioning circuit; the pulse signal acquisition module comprises a piezoelectric film pulse sensor, a penetrating infrared pulse sensor and a reflecting infrared pulse sensor.

2. The pulse signal acquisition and transmission experimental system as claimed in claim 1, wherein: the signal conditioning circuit mainly comprises an impedance converter, a 20HZ low-pass filter, a primary amplifying and filtering circuit, a secondary amplifying and filtering circuit, a low-pass filter and an amplifying circuit; the piezoelectric film pulse sensor is connected with the microprocessor module through the impedance converter, the 20HZ low-pass filter and the secondary amplification filter circuit, the penetrating infrared pulse sensor is connected with the microprocessor module through the primary amplification filter circuit and the secondary amplification filter circuit, and the reflecting infrared pulse sensor is connected with the microprocessor module through the low-pass filter and the amplification circuit.

3. The pulse signal acquisition and transmission experimental system as claimed in claim 2, wherein: the microprocessor module mainly comprises an MCU chip, and the MCU chip is respectively connected with a crystal oscillator circuit, a reset circuit, a buzzer circuit, an independent key circuit, an LED display circuit, a download circuit and a matrix key circuit.

4. The pulse signal acquisition and transmission experimental system as claimed in claim 3, wherein: the penetrating infrared pulse sensor adopts an HRM-2104 model correlation type infrared transmitting and receiving sensor; the piezoelectric film pulse sensor adopts an SDT1-028K type sensor; the reflective infrared pulse sensor adopts a pulseSensor module; the wireless Bluetooth communication module adopts a 2.0 standard HC-05 mode Bluetooth serial port module.

5. The pulse signal acquisition and transmission experimental system as claimed in claim 4, wherein: the impedance converter is composed of a voltage level follower of 10M ohm; the second-order amplification filtering circuit comprises a first-order passive high-pass filter with the cut-off frequency of 0.5HZ and a first-order active low-pass filter with the cut-off frequency of 20 HZ; the MCU chip is an enhanced 51-core singlechip STC12C5A60S2 model.