CN201085618Y - Volume pulsation wave signal capture apparatus based on USB interface - Google Patents
Volume pulsation wave signal capture apparatus based on USB interface Download PDFInfo
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- CN201085618Y CN201085618Y CNU2007201737078U CN200720173707U CN201085618Y CN 201085618 Y CN201085618 Y CN 201085618Y CN U2007201737078 U CNU2007201737078 U CN U2007201737078U CN 200720173707 U CN200720173707 U CN 200720173707U CN 201085618 Y CN201085618 Y CN 201085618Y
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Abstract
Disclosed is a volume pulse wave signal acquisition device based on a USB interface, which belongs to the human parameters detection field and is used for the biomedical engineering, and comprises a photoelectric sensor, a CPU central processing unit, a signal filter circuit, a signal amplifying circuit, a numerical control gain circuit, a pulse power supply circuit, a power switch control circuit, a USB universal serial bus interface circuit and a personal computer. The pulse power supply circuit supplies pulse voltage for the photoelectric sensor; the power switch control circuit is used for controlling the start-up or stop of the sensor; the electrical signal acquired by the photoelectric sensor is processed by the signal filter circuit and the signal amplifying circuit and is inputted to the CPU after the amplitude regulation of the numerical control gain circuit, and then is processed with analog-to-digital convert in an A/D converter in the CUP and the data is stored in the CPU; the acquired data is transmitted to the personal computer through real-time transmission by the USB universal serial bus interface circuit; the personal computer supplies power for the whole system; the device has small volume, convenient carrying and is applicable to the detection and analysis of the cardiovascular function.
Description
Technical field
This utility model belongs to the human parameters detection range of biomedical engineering.Be a kind of USB interface-based volume pulsation wave signal picker, can gather finger volume pulse ripple signal, and signal is sent into PC by the USB USB, can be widely used in cardiovascular function and detect and analyze.
Background technology
At present, both at home and abroad the noinvasive equipment that detects the cardiovascular hemodynamic mathematic(al) parameter mainly contains: ultrasoundcardiogram method, cardiac impedance method, spiral CT, nuclear cardiology method, magnetic resonance method etc., but these methods exist that volume is big, complicated operation, cost an arm and a leg, shortcoming such as testing environment is strict.1938, Hertzman proposed photoelectricity volume pulse tracing first, was to detect a kind of noinvasive detection method that volumetric blood changes by the photoelectricity means in biological tissue.At present, utilize this method generally to be used for detecting blood oxygen, brain oxygen, flesh oxygen, breathing rate and respiratory capacity etc. more.Before and after the nineties in 20th century, research worker begins mechanism research and the pressure pulse wave theory and combining with volume pulsation wave both at home and abroad, think that the blood flow characteristic that removes to derive and analyze volume pulsation wave by the characteristic of pressure pulse wave just becomes the directly perceived and effective method of comparison, their both relations will constitute the cardiovascular flow parameter of keys such as the Peripheral resistance of cardiovascular system and vascular compliance.
Under this prerequisite, utilize volume pulsation wave to detect and calculate the cardiovascular hemodynamic mathematic(al) parameter, just can become a kind of very feasible noinvasive detection method.Collecting device for the volume pulsation wave signal mainly is monitor of clinical practice etc., but this kind equipment costs an arm and a leg mostly, is unsuitable for carrying.Part pulse wave signal acquisition system also has RS232 standard serial communication interface circuit and is connected with PC.
Yet, these be used for fixing place, bigger, the expensive equipment of volume can not adapt to current in real time, detect the requirement of cardiovascular hemodynamic mathematic(al) parameter easily, thereby missed the evaluation of a lot of crucial physiological statuss, physiological process.In addition, the communication of RS232 standard serial is a kind of data transmission technology of low speed, and transfer rate is generally between 9600bps-38400bps.Need take a long time when transmitting a large amount of detection data, it does not support plug and play and hot plug yet simultaneously, uses very inconvenient as the pulse wave signal harvester.
The utility model content
The purpose of this utility model is to overcome the shortcoming that existing volume pulsation wave signal acquiring system volume is big, carry inconvenience, and the inconvenience of using the RS232 communication interface to be brought.
The technical solution of the utility model as depicted in figs. 1 and 2, a kind of USB interface-based volume pulsation wave signal picker, comprise photoelectric sensor, cpu central processing unit, signal filter circuit, signal amplification circuit, numerical control gain circuit, pulse power supply circuit, power switch control circuit, USB USB circuit, PC.The pulse power supply circuit is used for providing pulse voltage for photoelectric sensor; PC sends to CPU by USB USB circuit with instruction, CPU control power switch control circuit, thus the control photoelectric sensor begins or quits work; The signal of telecommunication that is collected by photoelectric sensor at first carries out signal processing through signal filter circuit, signal amplification circuit; The numerical control gain circuit is connected to form by digital potentiometer, operational amplifier and CPU, is controlled the increase or the minimizing of its amplification by CPU; Signal exports CPU at last to, finishes the A/D conversion in the A/D converter of CPU, and digital signal is stored among the CPU; USB USB circuit is connected to form by USB interface and CPU, be used for the volume pulsation wave Wave data after the CPU A/D conversion is uploaded to PC in real time by USB cable, or from PC reception instruction, the transmission of its data and receiving course are controlled by CPU; PC is system's power supply by USB interface.
Described cpu central processing unit is 51 series monolithics of Siliconlabs company, it is integrated 10 A/D converters and USB controller etc.; Control other each circuit working by the input/output signal of its each port.
Described signal filter circuit is made up of high pass filter and low-pass first order filter.High pass filter is made up of the RC circuit, and low-pass first order filter is made up of operational amplifier and RC feedback network.
Described signal amplification circuit comprises preamplifier and two-stage amplifier.Preamplifier is made up of instrument amplifier and peripheral resistance, and two-stage amplifier is made up of operational amplifier and feedback resistance.
Multivibrator and audion that described pulse power supply circuit is made up of 555 intervalometers and peripheral circuit are formed.Come the regulating impulse width by the resistance of resistance R A and RB, IRED+ is the pulse voltage of output.
Described power switch control circuit is made up of PNP audion and non-essential resistance thereof, and the base stage of audion links to each other with the P0.0 port of CPU through resistance R k-1, the conducting of control audion.
Described USB USB circuit is made up of CPU and USB interface and filter capacitor.5 different filter capacitors of capacity are used to shield the various High-frequency Interference of USB interface.Four lines of USB USB link to each other with VBUS, D+, D-and the GND of CPU respectively.VBUS is+input of 5V voltage, and D+ and D-are positive negative signal inputs, GND is a ground wire.Data among the CPU can be imported PC into by the USB USB (universal serial bus), and PC also sends to CPU by USB interface with instruction.
Described numerical control gain circuit is connected to form by digital potentiometer and operational amplifier and CPU, and the I/O port of CPU links to each other with each control end of digital potentiometer respectively, comprises the sheet choosing, sends pulse, the control of amplitude of variation direction.Potentiometer and operational amplifier have been formed feedback circuit.The last output of signal is connected to the input end of analog signal mouth of CPU by a diode, carries out the A/D conversion in CPU inside.
This utility model whole system is utilized the power supply of USB USB, after the voltage conversion circuit blood pressure lowering, gives each amplifier power supply.CPU has controlled the opening and closing of photoelectric sensor pulse power supply circuit.During unlatching, the signal of telecommunication will through baseline adjustment, be sent into 10 A/D converters among the CPU by high pass filter, pre-amplification circuit, low pass filter and numerical control gain regulating circuit.PC sends instruction by USB to CPU, the change in resistance of unbalanced pulse power supply circuits and control numerical control gain resistance.The data that collect are uploaded to PC in real time by the USB USB.
Characteristics of the present utility model are:
This utility model has been selected the higher CPU of integrated level, it is integrated A/D converter and USB controller, thus reduced some loaded down with trivial details external circuits, make whole signal picker realize the miniaturization design, easy to carry.
Can open pick off during detection in the opening and closing of PC end control pick off, just close it when not detecting, not only can protect pick off but also reduced power consumption.Simultaneously, also can send the amplitude size that acquired signal is regulated in instruction, to adapt to the big characteristics of different crowd signal amplitude gap by PC.
The RS232 standard serial communication interface transfer rate of using at present more existing signal pickers is low, do not support plug and play, do not support the shortcoming of hot plug, and this utility model uses USB USB and PC communication.This interface has fast, the characteristics of plug and play, support hot plug, thereby makes harvester and being connected of computer more efficient, convenient, simple to operate.Simultaneously, this utility model can import the signal that collects into PC in real time, makes that the detection of cardiovascular function and analysis are more quick and convenient.
Description of drawings
Fig. 1 schematic block diagram of the present utility model;
Fig. 2 circuit theory diagrams of the present utility model;
The specific embodiment
In conjunction with Fig. 1, Fig. 2 this utility model is further described:
A kind of USB interface-based volume pulsation wave signal picker, by photoelectric sensor, cpu central processing unit, signal filter circuit, signal amplification circuit, numerical control gain circuit form, pulse power supply circuit, power switch control circuit, USB USB circuit, power-switching circuit, baseline adjusted circuit, jtag interface circuit.
Cpu central processing unit U4 is 51 series monolithics of Siliconlabs company, and model is C8051F320.It is integrated 10 A/D converters, USB controller, and support on-line debugging.The vdd terminal mouth of CPU is its inner manostat general+5V voltage transitions for the output of+3.3V, can be external circuit voltage is provided.Light emitting diode links to each other with protective resistance R4-3, represents on USB USB circuit when lamp is bright.
The pulse power supply ON-OFF control circuit is connected to form by Q1 and CPU.4 feet of photoelectric sensor interface J1 are power supply ports of photoelectric sensor, are connected to the colelctor electrode of Q1 with Rin; Q1 is that model is 9015 PNP audion.The base stage of Q1 links to each other with the P0.0 foot of CPU through protective resistance Rk-1, controls the voltage of this port by CPU, thereby controls the conducting and the disconnection of audion.To the photoelectric sensor power supply, just stop power supply during disconnection during conducting.
The pulse power supply circuit is that 555 intervalometer and non-essential resistance, electric capacity, diode are formed multi-resonant oscillating circuit by the UR model.The dutycycle of pulse voltage is by the resistance control of RA and RB, and the Q foot of UR is the output of pulse voltage.The Q foot links to each other with the Q2 base stage by protective resistance RIRI; Q2 is that model is 9013 NPN audion.The Q foot voltage output of UR is controlled the conducting of Q2 and is closed.When conducting, IRED+ be output as VDD (+3.3V), during disconnection, IRED+ is output as 0V.
The volume pulsation wave signal of telecommunication is from 1, the 3 feet input of interface J1.After passing through the high-pass filtering circuit of C1-1, R1-1 and C1-2, R1-2 respectively, the preamplifier U1 of input system, the model of U1 is the instrument amplifier AD620 of ADI company.Rg is a feedback resistance, is connected between 1 foot and 8 feet of U1, and its resistance has determined preposition amplification.7,4 feet of U1 be respectively chip provide+5V and-voltage of 5V, C1-3, C1-4 are filter resistance, are used for High-frequency Interference on the filter out power line.Second amplifying circuit is made up of U2A and R2-1, R1-3, and U2 is that model is one of them operational amplifier of NE5532.The secondary amplification is the ratio of R2-1 and R1-3.RC network and U2A that R2-1 and C2-1 constitute have constituted low-pass first order filter.4,8 feet of chip provide respectively-5V and+voltage of 5V, C2-2 and C2-3 are filter capacitor.
Signal is from the 1 foot output of U2A, then by numerical control gain circuit adjustment amplification.U3 and U2B and CPU have connected to form the numerical control gain circuit.U3 is the numerical control gain potentiometer, and model is X9C103; U2B is that model is another operational amplifier of NE5532.The CS foot of U3 links to each other with the P0.1 of CPU, is used for sheet choosing.The INC foot links to each other with the P1.2 foot of CPU, is used for sending pulse to chip, just can trigger the adjustment of a resistance when pulse arrives.The U/D foot links to each other with the P1.3 of CPU, is used for controlling the increase of digital potentiometer resistance or reducing.VL links to each other with 7 feet with 6 feet of U2B respectively with VH, VW, constitutes feedback network, forms amplifying circuit, and its amplification is the resistance of X9C103 and the ratio of R2-3.Potentiometer RBase and resistance R Base1-1, RBase1-2 and U2B constitute the baseline adjusted circuit, by the resistance of regulator potentiometer RBase, regulate the reference voltage to U2B, make the useful signal of exporting in the scope that A/D converter allows.The output of the signal of 7 feet of U2B is through diode D2, filter negative signal after, link to each other with the P1.4 of CPU, P1.4 is as the input end of analog signal mouth of A/D converter among the CPU.
USB USB circuit is connected to form by USB interface and CPU.J2 is the USB USB, has 4 lines.4 foot ground connection, 3,2 feet link to each other with D-with the D+ of CPU respectively, are the positive-negative input ends of signal.1 foot is the VCC of system for whole system provides+5V voltage, and links to each other with REGIN with the VBUS of CPU, is the CPU power supply.C4-4, C4-5, C4-6, C4-7, C4-8 link to each other with VBUS, and other end ground connection is filter capacitor, and the high-frequency noise that is used on the filter out power disturbs.
Voltage conversion circuit is made up of U5 and non-essential resistance, electric capacity, inductance and diode.The model of U5 is MAX735, and the V+ foot provides+5V voltage, is provided by USB interface by PC.The VOUT foot is after the voltage transitions-5V output, is each amplifier power supply of system.
The external reset circuit of CPU is connected to form by RESET switch, electric capacity and CPU.RESET switch one end process resistance R 4-2 meets the VDD of CPU, other end ground connection, and when switch was pressed, system resetted.
The jtag interface circuit is connected to form by J4 and CPU.Because CPU possesses the function of on-line debugging, therefore jtag interface can be set in circuit, can write and download the CPU program flexibly.
This utility model inserts equipment the USB interface of PC earlier when detecting, simultaneously, only the forefinger or the middle finger of human body need be put into photoelectric sensor; Treat to get final product real-time acquired volume pulse wave signal after PC starts collection, and data upload to PC is further analyzed.This utility model volume little (being about 4.5cm*1.7cm), similar with the common U disk size, easy to carry, simple to operate, practical.
Claims (4)
1. USB interface-based volume pulsation wave signal picker, comprise photoelectric sensor, cpu central processing unit, signal filter circuit, signal amplification circuit, numerical control gain circuit, pulse power supply circuit, power switch control circuit, USB USB circuit, PC; The pulse power supply circuit is used for providing pulse voltage for photoelectric sensor; PC sends to CPU by USB USB circuit with instruction, CPU control power switch control circuit, thus the control photoelectric sensor begins or quits work; The signal of telecommunication that is collected by photoelectric sensor at first carries out signal processing through signal filter circuit, signal amplification circuit; The numerical control gain circuit is connected to form by digital potentiometer, operational amplifier and CPU, is controlled the increase or the minimizing of its amplification by CPU; Signal exports CPU at last to, finishes the A/D conversion in the A/D converter of CPU, and digital signal is stored among the CPU; USB USB circuit is connected to form by USB interface and CPU, be used for the volume pulsation wave Wave data after the CPU A/D conversion is uploaded to PC in real time by USB cable, or from PC reception instruction, the transmission of its data and receiving course are controlled by CPU; PC is system's power supply by USB interface.
2. a kind of USB interface-based volume pulsation wave signal picker according to claim 1, it is characterized in that: cpu central processing unit is 51 series monolithics.
3. a kind of USB interface-based volume pulsation wave signal picker according to claim 1, it is characterized in that: multivibrator and audion that the pulse power supply circuit is made up of 555 intervalometers and peripheral circuit are formed.
4. a kind of USB interface-based volume pulsation wave signal picker according to claim 1, it is characterized in that: the power switch control circuit is made up of PNP audion and non-essential resistance thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201737078U CN201085618Y (en) | 2007-10-19 | 2007-10-19 | Volume pulsation wave signal capture apparatus based on USB interface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201737078U CN201085618Y (en) | 2007-10-19 | 2007-10-19 | Volume pulsation wave signal capture apparatus based on USB interface |
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| CN201085618Y true CN201085618Y (en) | 2008-07-16 |
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| CNU2007201737078U Expired - Fee Related CN201085618Y (en) | 2007-10-19 | 2007-10-19 | Volume pulsation wave signal capture apparatus based on USB interface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101703396B (en) * | 2009-11-06 | 2011-08-03 | 中国科学院合肥物质科学研究院 | Radial artery pulse wave based cardiovascular function parameter detection and analysis method and detection device |
| CN101703392B (en) * | 2009-11-06 | 2011-08-03 | 中国科学院合肥物质科学研究院 | Radial artery pulse wave based cardiovascular function assessment system |
| CN102429646A (en) * | 2011-08-17 | 2012-05-02 | 天津大学 | Device and method for measuring orthogonal sine wave photoelectric volume pulse wave |
| CN102670183A (en) * | 2012-05-10 | 2012-09-19 | 北京工业大学 | Automobile steering wheel auxiliary device capable of monitoring pulse wave of human body |
| CN103354729A (en) * | 2011-01-24 | 2013-10-16 | 株式会社Act医疗服务 | Blood vessel pulse-wave measuring system |
| CN104526215A (en) * | 2014-11-28 | 2015-04-22 | 柳州振业焊接机电设备制造有限公司 | Sliding type automatic welding device |
-
2007
- 2007-10-19 CN CNU2007201737078U patent/CN201085618Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101703396B (en) * | 2009-11-06 | 2011-08-03 | 中国科学院合肥物质科学研究院 | Radial artery pulse wave based cardiovascular function parameter detection and analysis method and detection device |
| CN101703392B (en) * | 2009-11-06 | 2011-08-03 | 中国科学院合肥物质科学研究院 | Radial artery pulse wave based cardiovascular function assessment system |
| CN103354729A (en) * | 2011-01-24 | 2013-10-16 | 株式会社Act医疗服务 | Blood vessel pulse-wave measuring system |
| CN102429646A (en) * | 2011-08-17 | 2012-05-02 | 天津大学 | Device and method for measuring orthogonal sine wave photoelectric volume pulse wave |
| CN102670183A (en) * | 2012-05-10 | 2012-09-19 | 北京工业大学 | Automobile steering wheel auxiliary device capable of monitoring pulse wave of human body |
| CN104526215A (en) * | 2014-11-28 | 2015-04-22 | 柳州振业焊接机电设备制造有限公司 | Sliding type automatic welding device |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |