CN105725986A - Infrared pulsemeter based on single chip microcomputer - Google Patents
Infrared pulsemeter based on single chip microcomputer Download PDFInfo
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- CN105725986A CN105725986A CN201610254559.6A CN201610254559A CN105725986A CN 105725986 A CN105725986 A CN 105725986A CN 201610254559 A CN201610254559 A CN 201610254559A CN 105725986 A CN105725986 A CN 105725986A
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- signal
- infrared
- receiver
- sphygmometer
- amplification circuit
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0075—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/02007—Evaluating blood vessel condition, e.g. elasticity, compliance
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6825—Hand
- A61B5/6826—Finger
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
Abstract
The invention relates to an infrared pulsemeter based on a single chip microcomputer. The infrared pulsemeter comprises a signal transmitter, a signal receiver, a signal amplifying circuit, a signal processor and a display screen; the signal receiver, the signal amplifying circuit, the signal processor and the display screen are connected in sequence; the signal receiver receives a signal transmitted by the signal transmitter; the signal transmitter is provided with an infrared transmitting tube and transmits an infrared optical signal to a fingertip, the infrared transmitting tube forms a loop with a power supply through a current controller, and the current controller is connected with a timer; the signal receiver receives the infrared optical signal transmitted from the fingertip; the signal amplifying circuit performs amplifying processing on the signal received by the signal receiver; the signal processor is provided with an AD conversion circuit for converting the optical signal processed by the signal amplifying circuit to a voltage signal and transmitting the voltage signal to the signal processor; the display screen receives the signal outputted by the signal processor, and the signal is displayed on the display screen. The infrared pulsemeter has the advantages that a pulse signal can be transmitted and collected by utilizing infrared light, the carrying is convenient, and the measurement accuracy is high.
Description
Technical field
The present invention relates toSCM Based infrared sphygmometer, particularly to utilizing light perspectives to gather the device of pulse letter。
Background technology
Pulse is one of important indicator of cardiovascular and cerebrovascular vessel health.The Human Physiology disease information extracted from pulse is the important evidence of clinical diagnosis and treatment.The collection of pulse is experienced from simple with finger, to the extraction of complex device, and method varied 1.Point have following several principle: photoplethysmographic method, fluid coupling chamber pulse transducer, pressure resistance type pulse transducer and strain-type pulse transducer.Comparatively speaking, photoelectric detecting technology can effectively avoid electromagnetic interference, has good stability, and detected person will not produce any injury, it is possible to accomplishes the various information 2 of the detection patient of non-intrusive.In present society, lack the pulse transducer adopting photoelectric detecting technology of a kind of portable low cost high accuracy and sensitivity, based on such market demand, Method of Spreading Design.
Summary of the invention
The technical problem to be solved is to provide a kind of SCM Based infrared sphygmometer, utilizes Infrared perspective to gather pulse signal, can be convenient for carrying, and it is high that it measures accuracy.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of SCM Based infrared sphygmometer includes signal projector, signal receiver, signal amplification circuit, signal processor, display screen；
Described signal receiver, signal amplification circuit, signal processor, display exhibition are sequentially connected with, and signal receiver receives the signal that signal projector sends；
Described signal projector, it has infrared emission tube, sends infrared signal to finger tip, and infrared emission tube forms loop by current controller with power supply, and current controller is connected with timer;
Described signal receiver, is received from the infrared signal of finger tip transmission；
Described signal amplification circuit, the signal that signal receiver is received is amplified processing；
Described signal processor, its optical signal having after being processed by signal amplification circuit converts voltage signal to and is transferred to the A/D convertor circuit of signal processor；
Described display screen, receives the signal of signal processor output and shows on a display screen.
Further, the faint sinusoidal current signal of signal receiver is transformed into square wave current signal by signal amplification circuit.
Further, infrared sphygmometer also includes signal adjustment circuit；
Described signal adjustment circuit, is filtered the infrared signal of signal amplification circuit processing and amplifying, amplitude adjustment.
Further, integrated wireless network emitter on signal receiver；
Integrated wireless net receptor at end on described signal amplification circuit, signal receiver is connected with wireless network receptor at end by wireless network emitter at end with signal amplification circuit.
Further, infrared sphygmometer also includes ring for fixing, fixed trap includes set frame, set frame is provided with slideway, set frame is provided with buffering spongy layer with skin contact, buffering spongy layer is provided with open-work, and signal projector, signal receiver are connected on set frame and can slide along slideway, and signal projector, signal receiver are connected by bow.
It is also possible that bow is contraction pole.
Further, buffering spongy layer is provided with cannelure, open-work on buffering spongy layer is connected by cannelure, cannelure is provided with opening with set frame phase-contact surface and skin bark graft contacting surface does not set opening, the light emission port of signal projector inserts in cannelure, and the light receiver mouth of signal receiver inserts in cannelure.
It is an advantage of the current invention that 1, the measurement of pulse, it is necessary to the bio signal of pulse is changed into the signal of telecommunication.Adopt photoelectric detecting technology, it is intended that the bio signal of pulse is changed into light pulse signal, after light pulse signal be changed into the signal of telecommunication process.Blood is mainly composed of hemoglobin and HbO2 Oxyhemoglobin, hemoglobin and HbO2 Oxyhemoglobin, and the absorption curves of different wave length is as follows, it is seen that two kinds of materials are relatively weak to infrared ray absorbing, and corresponding intensity in transmission is stronger.Using infrared ray radiation blood capillary, along with the fluctuating of pulse, in blood vessel, the quantity of hemoglobin and HbO2 Oxyhemoglobin is being continually changing, and the intensity of the Infrared therefore transmitted also can be continually changing, and forms light pulse.Adopt light-sensitive element that light pulse is converted to the change of electric current, namely complete the extraction of pulse signal.
2, carry out, by current controller, the ultrared intensity that control signal emitter sends, electric current is flowed through more big for infrared-emitting diode, launch infra-red intensity more big, infrared angle is more little, can within a period of time, gather the signal that Different Red outside line intensity illumination pulse is formed, it is possible to improve the accuracy of pulses measure.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the present invention.
Fig. 2 isSignal projector electrical block diagram.
Fig. 3 is signal amplification shaping circuit.
Fig. 4 isSignal processing and display circuit.
Fig. 5 is fixed ring schematic diagram.
Fig. 6 is A-A sectional schematic diagram in Fig. 5.
Fig. 7 is operational flowchart of the present invention.
Such as figure, signal projector 10, signal receiver 20, signal amplification circuit 30, signal processor 40, display screen 50, wireless network emitter 21, current controller 11, timer 12, fixed trap 60, set frame 61, buffering spongy layer 62, open-work 63, bow 64, cannelure 65.
Detailed description of the invention
In Fig. 1, a kind of SCM Based infrared sphygmometer includes signal projector 10, signal receiver 20, signal amplification circuit 30, signal processor 40, display screen 50；
Signal receiver 20, signal amplification circuit 30, signal processor 40, display exhibition 50 are sequentially connected with, and signal receiver 20 receives the signal that signal projector 10 sends, it is preferred that integrated wireless network emitter 21 on signal receiver 20；
Integrated wireless net receptor at end 31 on signal amplification circuit 30, signal receiver 20 is connected with wireless network receptor at end 31 by wireless network emitter at end 21 with signal amplification circuit 30；
nullSignal projector 10(signal projector preferably infrared-emitting diode)，It has infrared emission tube，Infrared signal is sent to finger tip，In Fig. 2，Infrared emission tube 10 forms loop by current controller 11 with power supply，Current controller 11 is connected with timer 12，During work，Timer 12 pre-sets or current controller 11 working time Changing Pattern is set temporarily，After current controller 11 starts，Electric current in its infrared emission tube 10 can change，Electric current is flowed through more big for infrared-emitting diode，Launch infra-red intensity more big，Infrared angle is more little，When gathering pulse signal，The red transmission of different infra-red intensities crosses the same pulse that need to gather data，The data of the lower pulse of different infra-red intensity can be formed，Namely improve later stage process and form the accuracy of final pulse data;
Signal receiver 20, is received from the infrared signal of finger tip transmission；
Signal amplification circuit 30, the signal that signal receiver is received is amplified processing；Preferably, the faint sinusoidal current signal of signal receiver is transformed into square wave current signal by signal amplification circuit；In Fig. 3, this partial circuit selects LM358, and including two operational amplifiers, higher level's signal is inputted by 5 feet, and the first order is closed loop application, and amplification is:
Av=1+ (the R6 right side+R5)/R6 is left
Amplification Av is up to ∞ in theory.In practical operation, standardsizing rheostat R6 examination amplification effect reaches best.C6 is amplifier input offset electric capacity, it is prevented that upper limiting frequency reduces because of the increase of R5, and eliminates the delayed of the output voltage phase place because of parasitic capacitance generation.
The second level is open loop application, and Vcc is set as the 5V therefore output high level when input voltage is higher than 2.5V, and output low level when voltage is lower than 2.5V, for subordinate's processing of circuit.
In Fig. 4, signal processor 40, its optical signal having after being processed by signal amplification circuit converts voltage signal to and is transferred to the A/D convertor circuit of signal processor；
Display screen 50, receives the signal of signal processor output and shows on a display screen.
Preferably, infrared sphygmometer also includes signal adjustment circuit；
Described signal adjustment circuit, is filtered the infrared signal of signal amplification circuit processing and amplifying, amplitude adjustment.
In Fig. 5, a kind of SCM Based infrared sphygmometer also includes ring for fixing 60, fixed trap 60 includes set frame 61, set frame 61 is provided with slideway, and set frame 61 and skin contact are provided with buffering spongy layer 62, and buffering spongy layer 62 is provided with open-work 63, signal projector 10, signal receiver 20 are connected on set frame 61 and can slide along slideway, signal projector 10, signal receiver 20 are connected by bow 64, it is preferred that bow 64 is contraction pole.
In Fig. 6, preferably, buffering spongy layer 62 is provided with cannelure 65, open-work 63 on buffering spongy layer 62 is connected by cannelure 65, cannelure 65 is provided with opening with set frame 61 phase-contact surface and skin bark graft contacting surface does not set opening, the light emission port of signal projector 10 inserts in cannelure 65, and the light receiver mouth of signal receiver 20 inserts in cannelure 65.
nullWhen gathering data，First set frame 61 can be enclosed within finger tip，Buffering spongy layer 62 deforms under the effect of set frame 61 and finger tip，Realize the sealing to set frame 61 with finger tip contacts face，Set frame 61 can adopt the material that intensity is bigger，With the signal projector 10 that guarantee is connected to it on、Signal receiver 20 can along slideway slidably，The thickness of buffering spongy layer 62 can be adjusted according to the structure of human body difference finger，Such as it is enclosed within big mother refers to，Its buffering spongy layer 62 thickness is that to refer to that two short sides connect face, place thin with big mother、And refer to that two long sides connect outside thickness with big mother，Adopt being enclosed within finger tip by set frame 61 of can more sealing of such buffering sponge room 62，There is gap (after having gap in buffering spongy layer 62 with finger tip，Natural light can pass through gap and enter in set frame，Spoofing transmitter 10、Signal receiver 20 is launched or receiving infrared-ray，Ultimately cause test result distortion)；After being packaged by set frame 61, it is possible to by slip signals emitter 10, signal receiver 20, gather the data formed from position through finger tip pulse, disturbed by skin (finger scratch, callous etc.) through finger tip shape in fixed position before so can avoiding.
Preferably, signal projector 10, signal receiver 20 are connected by bow 64, signal projector 10, signal receiver 20 can be made to move integrally, in case stop signal receptor 20 receives the signal of the infrared ray traverse finger tip that signal projector 10 sends, bow 64 length can be adjusted according to experimental data, it is also possible to is adjusted to the thickness of finger tip according to tested.
The light emission port of signal projector 10 inserts in cannelure 65, and the light receiver mouth of signal receiver 20 inserts in cannelure 65, it is possible to avoid nature light or the interference to signal projector 10, signal receiver 20 of other light.Signal projector 10 launches infrared ray by open-work, signal receiver 20 receives the infrared signal through finger tip by open-work.
Such as Fig. 7, a kind of SCM Based infrared sphygmometer operational flowchart, the control of liquid crystal display screen 1602, the control of singlechip interruption, the setting of measurement bound and the calculating of heart rate.The control of 1602 liquid crystal display screens designs according to device description book, writes five functions and realizes liquid crystal display screen respectively and write a byte data, writes a byte instruction, shows character, cls and initialization at ad-hoc location.These five functions call when needs control liquid crystal display screen.
The initialization of singlechip interruption carries out in principal function, and the setting opening and closing conjunction measuring bound of interruption is adjusted.
First arranging the timer interruption triggered time in principal function is 50ms, opens external interrupt, but now opening timing device does not interrupt.When receiving the signal of level saltus step.External interrupt is triggered, and now opens timer interruption and starts timing.Using an enumerator, each timer interruption flip-flop number adds one.External interrupt is added and judges, be only just calculated when this enumerator is more than 6, this time interrupt during less than 6 ignoring.The triggering intervals of twice external interrupt that namely and if only if is more than 300ms(50 × 6) just can be recorded.Record the interval of twice triggering as a pulse interval.The upper limit pulse that can calculate measurement is 200 beats/min (60000ms ÷ 300ms).Adding in timer interruption function and judge, when the value of enumerator is more than 25, all parameters reset, and close display.Namely it is considered as pulseless interval greater than 1250ms and closes measurement and display.The lower limit that can calculate measurement is 48 beats/min.Measuring to six pulse intervals continuously, the pulse being scaled a minute after asking expectation shows.If heart rate is 80 beats/min.So from the time starting to measure display required be 4.5 seconds, measuring speed is fast.
Claims (7)
1. a SCM Based infrared sphygmometer, it is characterised in that: described infrared sphygmometer includes signal projector, signal receiver, signal amplification circuit, signal processor, display screen；
Described signal receiver, signal amplification circuit, signal processor, display exhibition are sequentially connected with, and signal receiver receives the signal that signal projector sends；
Described signal projector, it has infrared emission tube, sends infrared signal to finger tip, and infrared emission tube forms loop by current controller with power supply, and current controller is connected with timer;
Described signal receiver, is received from the infrared signal of finger tip transmission；
Described signal amplification circuit, the signal that signal receiver is received is amplified processing；
Described signal processor, its optical signal having after being processed by signal amplification circuit converts voltage signal to and is transferred to the A/D convertor circuit of signal processor；
Described display screen, receives the signal of signal processor output and shows on a display screen.
2. the SCM Based infrared sphygmometer of one according to claim 1, it is characterised in that: the faint sinusoidal current signal of signal receiver is transformed into square wave current signal by described signal amplification circuit.
3. the SCM Based infrared sphygmometer of one according to claim 1, it is characterised in that: described infrared sphygmometer also includes signal adjustment circuit；
Described signal adjustment circuit, is filtered the infrared signal of signal amplification circuit processing and amplifying, amplitude adjustment.
4. the SCM Based infrared sphygmometer of one according to claim 1, it is characterised in that: integrated wireless network emitter on described signal receiver；
Integrated wireless net receptor at end on described signal amplification circuit, signal receiver is connected with wireless network receptor at end by wireless network emitter at end with signal amplification circuit.
5. the SCM Based infrared sphygmometer of one according to claim 1, it is characterized in that: described infrared sphygmometer also includes ring for fixing, fixed trap includes set frame, set frame is provided with slideway, set frame is provided with buffering spongy layer with skin contact, buffering spongy layer is provided with open-work, and signal projector, signal receiver are connected on set frame and can slide along slideway, and signal projector, signal receiver are connected by bow.
6. the SCM Based infrared sphygmometer of one according to claim 5, it is characterised in that: described bow is contraction pole.
7. the SCM Based infrared sphygmometer of one according to claim 5, it is characterized in that: described buffering spongy layer is provided with cannelure, open-work on buffering spongy layer is connected by cannelure, cannelure is provided with opening with set frame phase-contact surface and skin bark graft contacting surface does not set opening, the light emission port of signal projector inserts in cannelure, and the light receiver mouth of signal receiver inserts in cannelure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610254559.6A CN105725986A (en) | 2016-04-22 | 2016-04-22 | Infrared pulsemeter based on single chip microcomputer |
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| CN201610254559.6A CN105725986A (en) | 2016-04-22 | 2016-04-22 | Infrared pulsemeter based on single chip microcomputer |
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| CN201610254559.6A Pending CN105725986A (en) | 2016-04-22 | 2016-04-22 | Infrared pulsemeter based on single chip microcomputer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108937928A (en) * | 2018-06-12 | 2018-12-07 | 李长寿 | A kind of Medical electromagnetic induction type three uses diagnostic equipment |
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| CN102389299A (en) * | 2010-07-14 | 2012-03-28 | 罗姆股份有限公司 | Plethysmogram sensor |
| CN203724078U (en) * | 2014-01-16 | 2014-07-23 | 陕西理工学院 | Photoelectric pulse transducer |
| CN104138251A (en) * | 2014-07-07 | 2014-11-12 | 苏州经贸职业技术学院 | Simple human body pulse test instrument |
| CN104207754A (en) * | 2014-09-19 | 2014-12-17 | 苏州经贸职业技术学院 | Portable pulse measuring instrument with clock function |
| GB2516220A (en) * | 2013-06-17 | 2015-01-21 | Dennis Majoe | Heart and Blood Pressure Measurement Device |
| CN205658894U (en) * | 2016-04-22 | 2016-10-26 | 湖北三峡职业技术学院 | Infrared sphygmometer based on singlechip |
-
2016
- 2016-04-22 CN CN201610254559.6A patent/CN105725986A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1692874A (en) * | 2004-05-08 | 2005-11-09 | 香港中文大学 | Finger ring type physiological information monitoring device |
| US20100298677A1 (en) * | 2009-05-22 | 2010-11-25 | Astek Technology Ltd. | Wireless ring-type physical detector |
| CN102389299A (en) * | 2010-07-14 | 2012-03-28 | 罗姆股份有限公司 | Plethysmogram sensor |
| GB2516220A (en) * | 2013-06-17 | 2015-01-21 | Dennis Majoe | Heart and Blood Pressure Measurement Device |
| CN203724078U (en) * | 2014-01-16 | 2014-07-23 | 陕西理工学院 | Photoelectric pulse transducer |
| CN104138251A (en) * | 2014-07-07 | 2014-11-12 | 苏州经贸职业技术学院 | Simple human body pulse test instrument |
| CN104207754A (en) * | 2014-09-19 | 2014-12-17 | 苏州经贸职业技术学院 | Portable pulse measuring instrument with clock function |
| CN205658894U (en) * | 2016-04-22 | 2016-10-26 | 湖北三峡职业技术学院 | Infrared sphygmometer based on singlechip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108937928A (en) * | 2018-06-12 | 2018-12-07 | 李长寿 | A kind of Medical electromagnetic induction type three uses diagnostic equipment |
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