CN113397550A - Wrist strap self-locking type mobile electrocardiograph - Google Patents
Wrist strap self-locking type mobile electrocardiograph Download PDFInfo
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- 208000024172 Cardiovascular disease Diseases 0.000 description 5
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- 238000001914 filtration Methods 0.000 description 1
- 210000004247 hand Anatomy 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
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- 210000005259 peripheral blood Anatomy 0.000 description 1
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/251—Means for maintaining electrode contact with the body
- A61B5/256—Wearable electrodes, e.g. having straps or bands
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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
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
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Abstract
The invention belongs to the field of heart detection equipment and instruments, and comprises a testing host and a wrist strap body, wherein the wrist strap body comprises a first wrist strap and a second wrist strap, the testing host is arranged on the first wrist strap, the wrist strap is divided into two sections, the two sections of the wrist strap second are connected through a self-locking device, and the self-locking device is arranged opposite to the testing host. The wrist strap sleeve is arranged on the first wrist strap, a first spring is arranged inside the first wrist strap and the second wrist strap, one end of the first spring is connected with the first wrist strap, and the other end of the first spring is connected with the second wrist strap. The wrist strap I and the wrist strap II are arranged in a sleeving manner and are connected together through the spring, so that the wrist strap I and the wrist strap II can slide relatively, and the wrist strap body is always clung to the wrist of a user under the action of the contraction elasticity of the spring, so that a gap between the test main body and the wrist of a tester is eliminated, and the test result is prevented from being influenced by external illumination.
Description
Technical Field
The invention belongs to the field of heart detection equipment and instruments, and relates to an electrocardiograph, in particular to a wrist strap self-locking type mobile electrocardiograph.
Background
With the increasing pressure and the increasing aging of the modern society, cardiovascular diseases become a timed bomb in the human body and are the first factors of death and injury of people. Since the clinical manifestations of most cardiovascular diseases are not obvious in the early or middle stages, the later stages are often reached once they are found. Therefore, the detection and prevention of cardiovascular diseases have become important research directions. Heart rate variability is one of the important criteria for detecting cardiovascular diseases, and its detection method is widely used in clinic.
The traditional heart rate variability detection method mainly detects the heart rate change after electrocardiosignals are measured by an electrocardiogram through a chest lead electrode, has the defects of high cost, inconvenient use and the like although the method is accurate in measurement, and is not suitable for being used in daily life.
For convenience of use, the wrist-worn heart rate measurement device appears in our field of vision, such as some smart watches or smart bracelets. In the use of wrist strap formula heart rate measuring equipment, can require the carrier to wear strictly usually, avoid ambient light to disturb the measuring result. However, the existing wrist strap type heart rate measuring equipment is often not capable of ensuring the tightness of contact with the wrist of a testee because the testee is not reasonable to wear, thereby causing the problem of inaccurate measuring results.
Disclosure of Invention
In order to solve the problems, the invention designs the wrist strap self-locking type mobile electrocardiograph, two nested wrist straps are connected by a spring, the tight contact between the wrist straps and the wrist of a user is realized, and the problem that the existing wrist strap type heart rate measuring equipment is influenced by light is solved.
The technical scheme adopted by the invention is that,
a wrist strap self-locking type mobile electrocardiograph comprises a testing host machine and a wrist strap body, wherein the wrist strap body comprises a first wrist strap and a second wrist strap, the testing host machine is arranged on the first wrist strap, the wrist strap is divided into two sections, the two sections of the wrist strap second are connected through a self-locking device, the self-locking device is arranged opposite to the testing host machine,
the wrist strap set is arranged on the first wrist strap, the first spring is arranged inside the first wrist strap and the second wrist strap, one end of the first spring is connected with the first wrist strap, the other end of the first spring is connected with the second wrist strap,
the self-locking device comprises a first magnetic block and a second magnetic block, wherein the first magnetic block and the second magnetic block are oppositely arranged on two wrist straps, and the two wrist straps are connected together under the action of the first magnetic block and the second magnetic block.
Furthermore, the self-locking device further comprises a push rod and a second spring, the push rod is arranged above the first magnetic block and below the second magnetic block, the second spring is arranged below the first magnetic block and above the second magnetic block, through holes are formed in two side portions of the wrist strap, and the push rod penetrates through the through holes.
Furthermore, a limiting rod is arranged on the push rod, a limiting groove is formed in the second wrist strap, and the limiting rod is arranged in the limiting groove in a moving mode in the vertical direction under the action of the push rod.
Furthermore, a protruding block is arranged at the connecting end of the second wrist strap, a groove is arranged at the connecting end of the second wrist strap, and the protruding block is located in the groove.
Further, the test host comprises a controller, a display, a power supply unit, a driving unit, a processing unit, a Light Emitting Diode (LED) 1 and a phototriode Q2, wherein the controller is connected with the LED2 through the driving unit, the phototriode Q2 is connected with the controller through the processing unit, and the power supply unit supplies power to the test host;
the first wrist strap is provided with a first round hole and a second round hole, the light emitting diode LED1 is arranged opposite to the first round hole, and the photoelectric triode Q2 is arranged opposite to the second round hole.
Furthermore, one side of the first wrist strap, which deviates from the test host machine, is provided with an elastic gasket, and the first round hole and the second round hole are both located in the elastic gasket.
Further, the driving unit comprises an operational amplifier U1 and a triode Q1, a non-inverting input end of the operational amplifier U1 is sequentially connected with a resistor R2 and a resistor R1 in series and then connected with a PWM output end of the controller, a capacitor C1 is connected between a connection point of the resistor R1 and the resistor R2 and the ground in series, a capacitor C2 is connected between a connection point of the resistor R2 and the operational amplifier U1 and the ground in series, an output end of the operational amplifier U1 is connected with a base of a triode Q1 through the resistor R3 in back, an emitter of the triode Q1 is grounded through a resistor R4, the light emitting diode LED1 is connected between a 5V power supply and a collector of the triode Q1 in series, and the conducting direction of the light emitting diode LED1 is directed to the triode Q1 from the 5V power supply.
The processing unit comprises an operational amplifier chip U3, a collector of a phototriode Q2 is connected with a + INA pin of the operational amplifier chip U3 through a capacitor C3, the + INA pin and the-INA pin of the operational amplifier chip U3 are respectively connected with reference voltage through resistors R6 and R7, a resistor R8 is connected between the OUTA pin and the-INA pin of the operational amplifier chip U3 in series, a capacitor C4 is connected on the resistor R8 in parallel, the OUTA pin of the operational amplifier chip U3 is connected with the + INB pin, the + INB pin and the-INB pin of the operational amplifier chip U3 are respectively connected with the reference voltage through a resistor R11 and a resistor R10, a resistor R9 is connected between the OUTB pin and the-INB pin of the operational amplifier chip U3 in series, a capacitor C5 is connected on the resistor R9 in parallel, and the OUTB pin of the operational amplifier chip U3 is used as an output end of the processing unit and is connected with the controller.
The working principle and the beneficial effects of the invention are as follows:
1. the wrist strap I and the wrist strap II are arranged in a sleeving manner and are connected together through the spring, so that the wrist strap I and the wrist strap II can slide relatively, and the wrist strap body is always clung to the wrist of a user under the action of the contraction elasticity of the spring, so that a gap between the test main body and the wrist of a tester is eliminated, and the test result is prevented from being influenced by external illumination.
2. According to the invention, the two wrist straps are connected through the first magnetic block and the second magnetic block, so that the wrist strap body forms a closed loop, and the magnetic connection mode can avoid the arrangement of parts on the inner side and the outer side of the wrist strap body, so that even under the condition that the wrist strap is tightly attached to the wrist, the tightening mark can be avoided, and the comfort degree of a wearer is improved.
The present invention will be described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the self-locking device of the present invention;
FIG. 3 is a schematic view of the present invention in an expanded configuration;
FIG. 4 is a circuit diagram of the drive unit of the present invention;
FIG. 5 is a circuit diagram of a processing unit of the present invention;
FIG. 6 is a circuit diagram of the low power consumption self-starting circuit of the present invention;
in the attached drawing, the test device comprises a test host 1, a test host 2, a first wrist strap, a second wrist strap, a third wrist strap, a fourth wrist strap, a fourth magnetic block, a 7, a fourth magnetic block, a fourth spring, a fourth spring, a fourth spring, a fourth spring, a fourth a.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, but the scope and implementation of the present invention are not limited thereto.
In one embodiment, as shown in FIGS. 1-3,
the embodiment provides a wrist strap self-locking type mobile electrocardiograph, which comprises a test host 1 and a wrist strap body, the wrist strap body comprises a first wrist strap 2 and a second wrist strap 3, the testing host 1 is arranged on the first wrist strap 2, the second wrist strap 3 is divided into two sections, the two sections of the second wrist strap 3 are connected through a self-locking device, the self-locking device is arranged opposite to the test host 1, the second wrist strap 3 is sleeved on the first wrist strap 2, a first spring 4 is arranged inside the first wrist strap 2 and the second wrist strap 3, one end of the first spring 4 is connected with the first wrist strap 2, the other end of the first spring 4 is connected with the second wrist strap 3, the self-locking device comprises a first magnetic block 5 and a second magnetic block 6, the first magnetic block 5 and the second magnetic block 6 are oppositely arranged on the two wrist straps 3, and the two wrist straps 3 are connected together under the action of the first magnetic block 5 and the second magnetic block 6.
In order to solve the problem that the wrist strap of the existing wrist strap type heart rate measuring equipment is unreasonable in design, a user cannot ensure that the wrist strap is tightly attached to the wrist when wearing the wrist strap, and the measuring result is easily influenced by external illumination. This embodiment sets up wrist strap 2 and two 3 of wrist strap with the cover mode setting, and the centre links together through spring 4, makes can relative slip between wrist strap 2 and the wrist strap two 3, under the effect of spring 4 shrink elasticity, user's wrist is always hugged closely to the wrist strap body to eliminate between test main part and the tester wrist space, avoided outside illumination to influence the test result. The first spring 4 of the present embodiment may be a flat spring or a plurality of thin springs arranged between the first wristband 2 and the second wristband 3, and the first spring 4 should keep the wristband body at a length similar to the narrowest circumference of the wrist in a natural extension state, so as to ensure that the first spring 4 enters the extension state when different users wear the wristband. The first wrist strap 2 and the second wrist strap 3 in this embodiment are preferably made of rubber with certain flexibility, so that the wrist strap can be worn conveniently. Although the prior watch band also has an elastic wrist strap with one section by one section, the elastic wrist strap is easy to clamp sweat hair or skin, which causes discomfort when being worn by people, and has the disadvantages of tedious work, higher cost and certain defects.
This embodiment has realized two wrist straps two 3's connection through magnetic block 5 and magnetic block two 6, makes the wrist strap body form a closed loop, and the mode of magnetism connection can avoid setting up the part in the wrist strap body outside, even like this hugs closely under the condition of wrist at the wrist strap, also can avoid producing and reing in the trace, improves the comfortable degree of person of wearing. And because cardiovascular disease appears in older crowd mostly, set up the self-lock device of magnet on the wrist strap formula electrocardiograph, easy operation more is applicable to the old person.
Further, in order to solve the problem of the separation of the first magnetic block 5 and the second magnetic block 6,
in this embodiment, the self-locking device further comprises a push rod 7 and a second spring 8, the push rod 7 is arranged above the first magnetic block 5 and below the second magnetic block 6, the second spring 8 is arranged below the first magnetic block 5 and above the second magnetic block 6, a through hole is formed in the side portion of the second wrist strap 3, and the push rod 7 penetrates through the through hole. Suitably, a long circular hole is preferably formed at the joint of the two wrist straps 3, so that the magnetic block I5 and the magnetic block II 6 can vertically move in the long circular hole.
When the wrist strap separating device is used, the upper push rod 7 and the lower push rod 7 are pressed by hands to push the first magnetic block 5 and the second magnetic block 6 to be staggered with each other, the two wrist straps 3 can be separated easily without the action of magnetic force, and the first magnetic block 5, the second magnetic block 6 and the two push rods 7 are all restored to the original positions under the action of the second spring 8 to wait for next use. In the present embodiment, the two push rods 7 are arranged one above the other in order to reduce the length of the push rods 7 exposed to the outside as much as possible. In this case, the length of the two push rods 7 exposed outside is half of the contact height of the two magnetic blocks, and if the push rods 7 are arranged on the wrist band two 3 on one side only, the length of the push rods 7 exposed outside is twice of the current length, which may affect the wearing experience of the user.
Further, in order to solve the problem of the sliding out of the push rod 7,
in this embodiment, the push rod 7 is provided with the limiting rod 9, the second wrist strap 3 is provided with the limiting groove 10, and the limiting rod 9 is located in the limiting groove 10 to move vertically under the action of the push rod 7.
Further, in order to further enhance the wearing stability of the wrist band body,
in the embodiment, the connecting end of one second wrist strap 3 is provided with a convex block 11, the connecting end of the other second wrist strap 3 is provided with a groove 12, and the convex block 11 is positioned in the groove 12. When two wrist straps 3 are connected together, the lug 11 is arranged in the groove 12, so that the upper and lower or front and back dislocation at the interface of the two wrist straps 3 can not occur, and the wearing stability of the wrist strap body at the wrist of a user is further ensured.
Furthermore, the present embodiment adopts the photoplethysmography to perform the detection of the electrocardiogram,
the testing host 1 comprises a controller, a display, a power supply unit, a driving unit, a processing unit, a Light Emitting Diode (LED) 1 and a phototriode Q2, wherein the controller is connected with the LED2 through the driving unit, the phototriode Q2 is connected with the controller through the processing unit, and the power supply unit supplies power to the testing host 1; the first wrist strap 2 is provided with a first round hole 13 and a second round hole 14, the light emitting diode LED1 is arranged opposite to the first round hole 13, and the phototriode Q2 is arranged opposite to the second round hole 14.
The test host is specifically set as a conventional setting of an intelligent bracelet or a watch, and is not described herein, the light emitting diode LED1 adopts a green light emitting diode, green light is emitted to irradiate the wrist, light beams are transmitted to the phototriode Q2 in a reflection mode to be received, in the process, the light intensity detected by the phototriode Q2 is weakened due to the absorption attenuation effect of skin muscles and blood of the wrist, wherein the absorption of the skin muscles, tissues and the like to the light is kept constant in the whole blood circulation, the blood volume in the skin is changed in a pulsating mode under the action of the heart, when the heart contracts, the peripheral blood volume is the largest, and the light absorption amount is the largest and the detected light intensity is the smallest; when the heart is in diastole, on the contrary, the detected light intensity is the maximum, so the light intensity received by the phototriode Q2 is in pulsatile change, and the change signal of the light intensity is converted into an electric signal, so the change of the volume pulse blood flow can be obtained.
Further, as shown in FIG. 3,
in this embodiment, an elastic washer 15 is arranged on one side of the first wrist strap 2 departing from the testing host 1, and the first round hole and the second round hole are both located in the elastic washer 15. Elastic washer 15 has further protected the detection zone that emitting diode LED1 and photoelectric triode Q2 formed not to receive external illumination to influence, guarantees measuring result's accuracy, on this basis, can set up a plurality of tiny holes on the elastic washer 15 perisporium, makes the detection zone can ventilative handle, avoids the detection zone to sweat and influences the testing result.
Further, as shown in FIG. 4,
in this embodiment, the driving unit includes an operational amplifier U1 and a triode Q1, a non-inverting input terminal of the operational amplifier U1 is connected to a PWM output terminal of the controller after being sequentially connected in series with resistors R2 and R1, a capacitor C1 is connected in series between a connection point of the resistors R1 and R2 and the ground, a capacitor C2 is connected in series between a connection point of the resistor R2 and the operational amplifier U1 and the ground, an output terminal of the operational amplifier U1 is connected to a base of the triode Q1 after passing through the resistor R3, an emitter of the triode Q1 is grounded through the resistor R4, the light emitting diode LED1 is connected in series between a 5V power supply and a collector of the triode Q1, and a conduction direction of the light emitting diode LED1 is directed to the triode Q1 from the 5V power supply.
In order to ensure that the light intensity of the light output by the light emitting diode LED1 is stable, so as to adapt to individual difference of a measurer, a voltage-controlled constant current source driving circuit is adopted, a PWM signal output by a controller passes through resistors R1, R2, C1 and C2 low-pass filters to obtain a direct current component which is used as an input signal, and Q1 is driven to be conducted through an operational amplifier U1, so that the light emitting diode LED1 is conducted to emit light, and the working current of the light emitting diode LED1 can be adjusted by changing the duty ratio of PWM, so that the output signal of a sensor is ensured to be in the optimal effective working interval.
Further, as shown in FIG. 5,
the processing unit of the embodiment comprises an operational amplifier chip U3, wherein a collector of a phototriode Q2 is connected with a + INA pin of an operational amplifier chip U3 through a capacitor C3, the + INA pin and the-INA pin of the operational amplifier chip U3 are respectively connected with reference voltage through resistors R6 and R7, a resistor R8 is connected in series between the OUTA pin and the-INA pin of the operational amplifier chip U3, a capacitor C4 is connected in parallel to the resistor R8, the OUTA pin of the operational amplifier chip U3 is connected with the + INB pin, the + INB pin and the-INB pin of the operational amplifier chip U3 are respectively connected with reference voltage through a resistor R11 and a resistor R10, a resistor R9 is connected in series between the OUTB pin and the-INB pin of the operational amplifier chip U3, a capacitor C5 is connected in parallel to the resistor R9, and the OUTB pin of the operational amplifier chip U3 is used as an output end of the processing unit and is connected with a controller.
Because the biological signals of the human body mostly belong to low-frequency weak signals under the background of strong noise, the pulse wave signals are low-frequency weak non-electrophysiological signals and need to be amplified and post-filtered to meet the acquisition requirement. The collected optical signals are converted into electric signals through a phototriode Q2, amplified and filtered through a processing circuit, and then input to a controller for operation and analysis, and real-time electrocardiogram parameters are displayed on a display.
The operational amplifier chip U3 includes A, B two operational amplifiers, the signal output from the phototransistor Q2 is coupled to the operational amplifier a through the capacitor C3 for amplification, and is set to be in-phase amplification, and at the same time, the capacitor C3 and the resistor R6 form a first-order passive high-pass filter, and the capacitor C4 and the resistor R8 make the operational amplifier a have low-pass filtering characteristics, and form a first-order active low-pass filter. The circuit adopts a single power supply working mode, the reference potential is 1/2VCC, and the reference potential can be provided by a voltage stabilizing diode. The circuit structure of the operational amplifier B is the same as that of the operational amplifier A. The processing unit adopts a two-stage amplification cascade mode, so that the phenomenon of circuit instability caused by overhigh gain of a single operational amplifier is avoided.
Further, in this embodiment, a key switch is used to implement the opening and closing actions of the electrocardiograph, the key switch is connected in series between the power supply unit and the controller, and the key switch is disposed on the side of the test host 1, so that a user can perform corresponding actions on the key switch.
Because the user is when wearing the wrist strap, always remember to open electrocardiograph detection switch, but when taking off the wrist strap, often can forget to close, arouse that unnecessary electric quantity is extravagant, in order to solve this problem, this embodiment still includes low-power consumption from starting circuit, as shown in fig. 6, low-power consumption from starting circuit includes tongue tube U2 and opto-coupler U4, tongue tube U2 is established ties between the input of opto-coupler U4 and voltage source VCC, the interrupt pin of opto-coupler U4's output connection controller, tongue tube U2 sets up in the position relative with magnetic block one 5, promptly near magnetic block two 6, be close to or keep away from along with the takeing of wrist strap magnetic block one 5, in this embodiment, replace magnetic block two 6 with ordinary iron plate, avoid magnetic block two 6 to influence the break-make-break action of tongue tube U2.
When a user takes off the wrist strap, the reed switch U2 is separated from the magnetic block I5 and is not interfered by the magnetic block I5, the reed switch U2 is disconnected, the corresponding optocoupler U4 is not conducted, the output signal INT0 is a low level signal, the interrupt pin of the controller judges that the user takes off the wrist strap by receiving the signal, the electrocardio detection is not needed, the data transmission with the driving unit, the processing unit and the display is not carried out, the electrocardiograph stops working for a while, and the loss of electric quantity is avoided.
Claims (8)
1. The wrist strap self-locking type mobile electrocardiograph comprises a testing host (1) and a wrist strap body, and is characterized in that the wrist strap body comprises a first wrist strap (2) and a second wrist strap (3), the testing host (1) is arranged on the first wrist strap (2), the second wrist strap (3) is divided into two sections, the two sections of the second wrist strap (3) are connected through a self-locking device, the self-locking device is arranged opposite to the testing host (1),
the second wrist strap (3) is sleeved on the first wrist strap (2), a first spring (4) is arranged inside the first wrist strap (2) and the second wrist strap (3), one end of the first spring (4) is connected with the first wrist strap (2), the other end of the first spring (4) is connected with the second wrist strap (3),
the self-locking device comprises a first magnetic block (5) and a second magnetic block (6), wherein the first magnetic block (5) and the second magnetic block (6) are oppositely arranged on the two wrist straps (3), and the two wrist straps (3) are connected together under the action of the first magnetic block (5) and the second magnetic block (6).
2. The wrist band self-locking type mobile electrocardiograph according to claim 1, which is characterized in that: the self-locking device further comprises a push rod (7) and a second spring (8), the push rod (7) is arranged above the first magnetic block (5) and below the second magnetic block (6), the second spring (8) is arranged below the first magnetic block (5) and above the second magnetic block (6), a through hole is formed in the side portion of the second wrist strap (3), and the push rod (7) penetrates through the through hole.
3. The wrist band self-locking type mobile electrocardiograph according to claim 2, which is characterized in that: be equipped with gag lever post (9) on push rod (7), be equipped with spacing groove (10) on wrist strap two (3), gag lever post (9) are in along vertical direction removal setting under the effect of push rod (7) in spacing groove (10).
4. The wrist band self-locking type mobile electrocardiograph according to claim 1, which is characterized in that: the connecting end of one second wrist strap (3) is provided with a convex block (11), the connecting end of the other second wrist strap (3) is provided with a groove (12), and the convex block (11) is positioned in the groove (12).
5. The wrist band self-locking type mobile electrocardiograph according to claim 1, which is characterized in that: the testing host (1) comprises a controller, a display, a power supply unit, a driving unit, a processing unit, a Light Emitting Diode (LED) 1 and a phototriode Q2, wherein the controller is connected with the LED2 through the driving unit, the phototriode Q2 is connected with the controller through the processing unit, and the power supply unit supplies power to the testing host (1);
the wrist strap I (2) is provided with a first round hole (13) and a second round hole (14), the light emitting diode LED1 is arranged opposite to the first round hole (13), and the photoelectric triode Q2 is arranged opposite to the second round hole (14).
6. The wrist band self-locking type mobile electrocardiograph according to claim 5, which is characterized in that: one side of the first wrist strap (2) departing from the testing host (1) is provided with an elastic gasket (15), and the first round hole and the second round hole are both located in the elastic gasket (15).
7. The wrist band self-locking type mobile electrocardiograph according to claim 5, which is characterized in that: the driving unit comprises an operational amplifier U1 and a triode Q1, the non-inverting input end of the operational amplifier U1 is sequentially connected with a resistor R2 and a resistor R1 in series and then connected with the PWM output end of the controller, a capacitor C1 is connected between the connection point of the resistor R1 and the connection point of the resistor R2 and the ground in series, a capacitor C2 is connected between the connection point of the resistor R2 and the connection point of the operational amplifier U1 and the ground in series, the output end of the operational amplifier U1 is connected with the base of a triode Q1 through the resistor R3 in back, the emitter of the triode Q1 is grounded through a resistor R4, a light emitting diode LED1 is connected between a 5V power supply and the collector of the triode Q1 in series, and the conducting direction of the light emitting diode LED1 is directed to a triode Q1 from the 5V power supply.
8. The wrist band self-locking type mobile electrocardiograph according to claim 5, which is characterized in that: the processing unit comprises an operational amplifier chip U3, a collector of a phototriode Q2 is connected with a + INA pin of the operational amplifier chip U3 through a capacitor C3, the + INA pin and the-INA pin of the operational amplifier chip U3 are respectively connected with reference voltage through resistors R6 and R7, a resistor R8 is connected between the OUTA pin and the-INA pin of the operational amplifier chip U3 in series, a capacitor C4 is connected on the resistor R8 in parallel, the OUTA pin of the operational amplifier chip U3 is connected with the + INB pin, the + INB pin and the-INB pin of the operational amplifier chip U3 are respectively connected with the reference voltage through a resistor R11 and a resistor R10, a resistor R9 is connected between the OUTB pin and the-INB pin of the operational amplifier chip U3 in series, a capacitor C5 is connected on the resistor R9 in parallel, and the OUTB pin of the operational amplifier chip U3 is used as an output end of the processing unit and is connected with the controller.
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| CN202110681805.7A CN113397550A (en) | 2021-06-19 | 2021-06-19 | Wrist strap self-locking type mobile electrocardiograph |
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Application publication date: 20210917 |