CN113331807B - A portable blood pressure detector - Google Patents

Abstract

The invention relates to the technical field of electronic equipment, and provides a portable blood pressure detector which comprises a host and a cuff, wherein the host is communicated with the cuff through a hose I, an inflatable belt II, an inflatable belt III, an inflatable belt IV and an inflatable belt V which are mutually communicated are arranged on the inner surface of the cuff, the inflatable belt I and the inflatable belt III are parallel to the width direction of the cuff, the inflatable belt II and the inflatable belt IV are parallel to the length direction of the cuff, one end of the inflatable belt V is communicated with the middle part of the inflatable belt II, the other end of the inflatable belt V is communicated with the middle part of the inflatable belt IV, the middle part of the inflatable belt II is communicated with the host through a hose II, and the length of the inflatable belt II is 1/2-2/3 of the length of the cuff. Through the technical scheme, the problems that the blood pressure detector in the prior art is not standard in use and the test result is inaccurate are solved.

Description

A portable blood pressure detector

technical field

The invention relates to the technical field of electronic equipment, in particular to a portable blood pressure detector.

Background technique

An electronic sphygmomanometer is a medical device that uses modern electronic technology and the principle of indirect measurement of blood pressure to measure blood pressure. It usually consists of a blocking cuff, a sensor, an air pump, and a measurement circuit. Nowadays, the electronic sphygmomanometer has realized automatic intelligent measurement, and the measurement data can be automatically transmitted to the health management platform through the network, and the generated health data report will be fed back to the user. The measurement results are also more accurate than traditional electronic blood pressure monitors due to the use of more advanced technology. The electronic sphygmomanometer needs to be operated in a standardized manner. For example, the armband needs to be properly bound. Everyone has different standards for the moderate binding force. If the binding force is not appropriate, the test results will be affected.

Contents of the invention

The invention proposes a portable blood pressure detector, which solves the problem in the prior art that the use of the blood pressure detector is not standardized, resulting in inaccurate test results.

The technical scheme of the present invention is as follows: comprising a host and a cuff, the host communicates with the cuff through a hose one, and the inner surface of the cuff is provided with interconnected inflatable belt one, inflatable belt two, inflatable belt three, inflatable belt Band four and inflatable band five, said inflatable band one and said inflatable band three are all parallel to the width direction of said cuff, said inflatable band two and said inflatable band four are all parallel to the length direction of said cuff , one end of the inflatable belt five communicates with the middle part of the inflatable belt two, the other end of the inflatable belt five communicates with the middle part of the inflatable belt four, and the middle part of the inflatable belt two communicates with the said inflatable belt two through the hose two host connected,

The length of the second inflatable belt is 1/2 to 2/3 of the length of the cuff.

Further, one end of the cuff is provided with a snap ring, and the other end of the cuff is provided with a stopper, and the height of the stopper is greater than the height of the snap ring.

Further, the stopper is made of elastic material.

Further, an air pump control circuit connected to the main control circuit is arranged inside the host, and the air pump control circuit includes a triode Q2, an optocoupler U1 and a Darlington tube Q1 connected in sequence, and the base of the triode Q2 is connected to the The PWM output terminal of the main control circuit is connected, the emitter of the triode Q2 is connected to the power supply VCC, the collector of the triode Q2 is connected to the input terminal of the optocoupler U1, and the output terminal of the optocoupler U1 is connected to the Darlington tube The base of Q1 is connected, the emitter of the Darlington Q1 is connected to the power supply VDD through the resistor R1, the collector of the Darlington Q1 is grounded, and the emitter of the Darlington Q1 is also connected to the air pump M The positive power supply end is connected, and the negative power supply end of the air pump M is grounded.

Further, the negative power supply terminal of the air pump M is grounded through a resistor R4, the remote end of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier U4B, and the inverting input terminal of the operational amplifier U4B is connected to the reference voltage VREF. The output end of the amplifier U4B is connected with the IO port of the main control circuit.

Further, it also includes a reference source circuit, the reference source circuit includes a resistor R6 and a potentiometer RP1 connected in series, one end of the resistor R6 is connected to the power supply VDD, one end of the potentiometer RP1 is grounded, and the slide of the potentiometer RP1 As the reference voltage VREF, the terminal is connected to the inverting input terminal of the operational amplifier U4B.

Further, the host is also provided with a power switching circuit, the power switching circuit includes a triode Q7, a diode D1 and a diode D2, the emitter of the triode Q7 is connected to the positive pole of the battery B1, and the base of the triode Q7 is in turn The diode D1 and the resistor R9 are connected to the power supply 3.3V, the collector of the triode Q7 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the power supply 3.3V, and the cathode of the diode D2 is used as the output of the power switching circuit, which is The circuit components in the host are powered.

Working principle of the present invention and beneficial effect are:

In the present invention, by setting the inflatable belt (including inflatable belt 1, inflatable belt 2, inflatable belt 3, inflatable belt 4 and inflatable belt 5) on the inner wall of the cuff, when the tester sets the cuff on the upper arm, click on the The pre-inflation button, the host first inflates the inflatable belt through the hose two-way, when the inflatable belt is full, the user adjusts the tightness of the cuff according to the pressure of the upper arm, so that the upper arm does not feel oppressed. After the cuff tightness is adjusted, the main engine discharges the gas in the inflatable belt through the hose two. After the air in the inflatable band is exhausted, keep a proper distance between the cuff and the upper arm. At this time, the tester clicks the start button on the host, and the host inflates the cuff through the hose to start the blood pressure test.

Usually, the length of the cuff is 2/3~3/2 of the circumference of the upper arm. In order to ensure the accuracy of the measurement results, the length of the second inflatable belt should be less than the circumference of the upper arm. The length of the second inflatable belt is 1/2 of the length of the cuff. 2~2/3 is appropriate.

The setting of the inflatable belt in the present invention provides a suitable reference for the tester to adjust the tightness of the cuff, facilitates the tester to adjust the cuff to a suitable value, and is beneficial to improve the accuracy of the measurement result.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the cuff top view structure schematic diagram among the present invention;

Fig. 2 is a schematic diagram of a three-dimensional structure of a cuff in the present invention;

Fig. 3 is the schematic diagram of the air pump control circuit in the present invention;

Fig. 4 is a schematic diagram of a power switching circuit in the present invention;

Fig. 5 is a schematic diagram of the automatic power-off circuit in the present invention;

In the figure: 1 cuff, 101 clip ring, 102 stopper, 2 inflatable belt, 21 inflatable belt one, 22 inflatable belt two, 23 inflatable belt three, 24 inflatable belt four, 25 inflatable belt five, 26-hose two , 3-air pump control circuit, 4-power switching circuit.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all involve the protection scope of the present invention.

As shown in Figure 1-2, the portable blood pressure detector of this embodiment includes a host and a cuff. The host communicates with the cuff through a flexible hose. Belt 3, inflatable belt 4 and inflatable belt 5, inflatable belt 1 and inflatable belt 3 are parallel to the width direction of the cuff, inflatable belt 2 and inflatable belt 4 are parallel to the length direction of the cuff, and one end of inflatable belt 5 is parallel to the inflatable The middle part of belt 2 is connected, the other end of inflatable belt 5 is connected with the middle part of inflatable belt 4, and the middle part of inflatable belt 2 is connected with the host through hose 2.

The length of the inflatable band two is 1/2 to 2/3 of the length of the cuff.

In the present invention, by setting the inflatable belt (including inflatable belt 1, inflatable belt 2, inflatable belt 3, inflatable belt 4 and inflatable belt 5) on the inner wall of the cuff, when the tester sets the cuff on the upper arm, click on the The pre-inflation button, the host first inflates the inflatable belt through the hose two-way, when the inflatable belt is full, the user adjusts the tightness of the cuff according to the pressure of the upper arm, so that the upper arm does not feel oppressed. After the cuff tightness is adjusted, the main engine discharges the gas in the inflatable belt through the hose two. After the air in the inflatable band is exhausted, keep a proper distance between the cuff and the upper arm. At this time, the tester clicks the start button on the host, and the host inflates the cuff through the hose to start the blood pressure test.

Usually, the length of the cuff is 2/3~3/2 of the circumference of the upper arm. In order to ensure the accuracy of the measurement results, the length of the second inflatable belt should be less than the circumference of the upper arm. The length of the second inflatable belt is 1/2 of the length of the cuff. 2~2/3 is appropriate.

The setting of the inflatable belt in the present invention provides a suitable reference for the tester to adjust the tightness of the cuff, facilitates the tester to adjust the cuff to a suitable value, and is beneficial to improve the accuracy of the measurement result.

Inflatable belt 1, inflatable belt 5 and inflatable belt 3 are distributed along the length direction of the cuff, and are separated from each other by a certain distance. When in use, inflatable belt 1, inflatable belt 5 and inflatable belt 3 are distributed along the circumference of the upper arm It plays a supporting role to ensure that the cuff is set equidistantly on the outer side of the upper arm, thereby helping to ensure accurate adjustment of the tightness of the cuff.

Among them, the air source for inflating the inflatable belt comes from the air pump in the host to inflate the cuff, the hose required for inflating the inflatable belt 2, the setting method of the one-way valve, and the hose required for inflating the cuff 1, the location of the one-way valve The setting method is the same; the setting method of the exhaust valve required when the inflatable belt is exhausted is the same as the setting method of the exhaust valve required when the cuff is exhausted, and will not be repeated here.

Furthermore, one end of the cuff is provided with a snap ring, and the other end of the cuff is provided with a blocking portion, and the height of the blocking portion is greater than that of the snap ring.

Under normal conditions, the end of the cuff away from the snap ring passes through the snap ring, and due to the blocking effect of the stopper, the two ends of the cuff are snapped together and remain in a ring shape; Put the ring-shaped cuff on the upper arm, which is convenient for the tester to operate.

Further, the retaining portion is made of elastic material.

The stopper is made of elastic material. When the two ends of the cuff need to be disengaged, the volume of the stopper is reduced by squeezing the stopper, and can be pulled out from the snap ring to realize the detachment of both ends of the cuff.

Further, an air pump control circuit connected to the main control circuit is arranged inside the host computer. As shown in FIG. The PWM output terminal of the control circuit is connected, the emitter of the transistor Q2 is connected to the power supply VCC, the collector of the transistor Q2 is connected to the input terminal of the optocoupler U1, the output terminal of the Q6 optocoupler U1 is connected to the base of the Darlington tube Q1, The emitter of Q6 Darlington tube Q1 is connected to the power supply VDD through resistor R1, the collector of Q6 Darlington tube Q1 is grounded, the emitter of Q6 Darlington tube Q1 is also connected to the positive power supply terminal of the air pump M, and the negative terminal of the air pump M The power supply terminal is grounded.

When it is necessary to inflate the cuff or inflatable belt, the main control circuit outputs a control signal, the transistor Q2 is turned on, the optocoupler U1 is turned on, the Darlington tube Q1 is turned on, the air pump M is powered, and the cuff or inflatable belt starts to be inflated. Inflatable; the optocoupler U1 plays the role of electrical isolation, preventing external interference signals from entering the main control circuit, thereby ensuring the reliable operation of the main control circuit; the control signal of the main control circuit is amplified by the Darlington tube Q1, driving the air pump, and the circuit The structure is simple and the cost is low.

Further, as shown in Figure 3, the negative power supply terminal of the air pump M is grounded through the resistor R4, the remote terminal of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier U4B, and the inverting input terminal of the operational amplifier U4B of Q6 is connected to the reference voltage VREF, The output end of the operational amplifier U4B of Q6 is connected with the IO port of the main control circuit of Q6.

The resistor R4 is connected in series with the air pump M, and the current flowing through the air pump M generates a voltage UR1 on the resistor R4, and the voltage UR1 is input to the non-inverting input terminal of the operational amplifier U4B. When the air pump M is working, the voltage UR1 is greater than the reference voltage VREF, and the op amp U4B outputs a high level; on the contrary, when the air pump M is not working, the voltage UR1 is less than the reference voltage VREF, and the op amp U4B outputs a low level; The output end of the main control circuit is connected to the main control circuit, and the main control circuit calculates the actual working time of the blood pressure detector in this embodiment by calculating the high level time.

When determining the service life of the blood pressure detector in this embodiment, both the factory date and the actual working time can be taken into account. The blood pressure detector with a relatively short actual working time can appropriately increase the service life; on the contrary, the blood pressure detector with a relatively long actual working time, The service life can be appropriately reduced; compared with simply determining the service life by the delivery time, it can avoid waste of resources while ensuring the detection accuracy.

Further, it also includes a reference source circuit, as shown in Figure 3, the reference source circuit includes a series resistor R6 and a potentiometer RP1, one end of the resistor R6 is connected to the power supply VDD, one end of the potentiometer RP1 is grounded, and the sliding end of the potentiometer RP1 serves as The reference voltage VREF is connected to the inverting input terminal of the operational amplifier U4B of Q6.

Resistor R6 and potentiometer RP1 are connected in series between the power supply VDD and ground to form a resistor divider circuit. The divided voltage of potentiometer RP1 is output as the reference voltage VREF. By adjusting the resistance value of potentiometer RP1, the reference voltage VREF can be adjusted. Circuit structure Simple and low cost.

Further, a power switching circuit is also provided in the host computer, as shown in Figure 4, the power switching circuit includes a triode Q7, a diode D1 and a diode D2, the emitter of the triode Q7 is connected to the positive pole of the battery B1, and the base of the triode Q7 is sequentially passed through the diode D1 and resistor R9 are connected to the power supply 3.3V, the collector of the transistor Q7 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the power supply 3.3V, and the cathode of the diode D2 is used as the output of the power switching circuit to supply power to the circuit components in the host.

This embodiment is a portable product, which is powered by batteries for easy use at any time; at the same time, this embodiment is also equipped with a power adapter. In the case of an AC power supply, the user can use the power adapter to connect an external AC power supply to this embodiment. The output voltage of the battery B1 is 3V, the output voltage of the power adapter is 3.3V, the emitter of the transistor Q7 is connected to the battery B1, the base of the transistor Q7 is connected to the power supply of 3.3V, when there is an external power supply, the emitter junction of the transistor Q7 is reverse biased, Transistor Q7 is turned off, diode D2 is turned on, and the power supply 3.3V supplies power for subsequent electrical equipment; when the external power supply is disconnected, the emitter junction of triode Q7 is forward-biased, triode Q7 is turned on, battery B1 supplies power for subsequent electrical equipment, and the diode D2 is cut off to prevent the current of battery B1 from flowing back into the power adapter. When the battery B1 supplies power for subsequent electrical equipment, the diode D1 and the resistor R10 provide bias current for the triode Q7. When the power of the battery B1 is lower than the set value, the bias current is too small, the triode Q7 is disconnected, and the battery B1 stops. Provide power for subsequent electrical equipment to avoid over-discharge of the battery B1.

Furthermore, an automatic power-off circuit is also provided in the host computer, as shown in Figure 5, the automatic power-off circuit includes a triode Q4 and a triode Q6, the collector of the triode Q4 is connected to the output PWR_SEL of the power switching circuit, and the base of the triode Q4 passes through the The resistor R5 and the resistor R7 are connected to the collector of the transistor Q6, the base of the transistor Q6 is connected to the Q6 main control circuit, the emitter of the transistor Q6 is grounded, the series point of the resistor R5 and the resistor R7 is connected to one end of the button KEY1, and the button KEY1 The other end is grounded through capacitor C1, and the remote end of Q6 capacitor C1 is connected to the collector of transistor Q4 through resistor R8. The collector of transistor Q4 is used as the output end of the automatic power-off circuit to supply power to the circuit components in the host.

In the initial state, both the transistor Q4 and the transistor Q6 are turned off, and the main control circuit is disconnected from the battery B1 and the power adapter. When the tester presses the button KEY1, since the terminal voltage of the capacitor C1 cannot change abruptly, the output PWR_SEL of the power switching circuit charges the capacitor C1 through the emitter junction of the transistor Q4, the resistor R5 and the button KEY1, and the transistor Q4 obtains a larger bias The output current of the power supply switching circuit PWR_SEL enters the saturation state quickly, and the main control circuit is powered by the transistor Q4. The main control circuit is powered on and starts to work. The main control circuit outputs the control signal SW to the transistor Q6, and the transistor Q6 is turned on. At this time, even if the button KEY1 is released, the transistor Q6 can still provide a bias current for the transistor Q4, and the transistor Q4 continues to saturate. On, the circuit enters a stable working state.

If the main control circuit does not receive the tester's instruction input within the set time, it is judged that the tester has used up, the main control circuit outputs the control signal SW to the base of the transistor Q6, the transistor Q6 is turned off, and cannot continue to be the transistor Q4. The bias current is provided, the transistor Q4 is turned off, and the output PWR_SEL of the power switching circuit stops supplying power to the main control circuit. Correspondingly, other electrical equipment is powered off to avoid the equipment being in a power-on standby state for a long time.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention within.

Claims (5)

1. A portable blood pressure detector, comprising a main unit and a cuff, the main unit communicates with the cuff through a flexible pipe one, and is characterized in that the inner surface of the cuff is provided with interconnected inflatable bands one and two inflatable bands , inflatable belt three, inflatable belt four and inflatable belt five, the inflatable belt one and the inflatable belt three are all parallel to the width direction of the cuff, the inflatable belt two and the inflatable belt four are all parallel to the The length direction of the cuff is parallel, one end of the five inflatable belts communicates with the middle part of the two inflatable belts, the other end of the five inflatable belts communicates with the middle part of the four inflatable belts, and the middle part of the inflatable belt two passes through The second hose communicates with the host, The length of the second inflatable belt is 1/2~2/3 of the length of the cuff, before starting the blood pressure test, inflate the inflatable belt through the second hose to determine the distance between the cuff and the upper arm; specifically includes : After the tester puts the cuff on the upper arm, click the pre-inflate button on the main unit, the main unit first inflates the inflatable band through the hose, and when the inflatable band is full, the user adjusts the cuff according to the pressure of the upper arm. It is appropriate that the upper arm does not feel oppressed; after the cuff tightness is adjusted, the main unit discharges the gas in the inflatable belt through the second hose; after the gas in the inflatable belt is discharged, keep a proper distance between the cuff and the upper arm; At this time, the tester clicks the start button on the host, and the host inflates the cuff through the hose to start the blood pressure test; The host is internally provided with an air pump control circuit connected to the main control circuit. The air pump control circuit includes a triode Q2, an optocoupler U1 and a Darlington tube Q1 connected in sequence, and the base of the triode Q2 is connected to the main control circuit. The PWM output terminal of the circuit is connected, the emitter of the triode Q2 is connected to the power supply VCC, the collector of the triode Q2 is connected to the input terminal of the optocoupler U1, and the output terminal of the optocoupler U1 is connected to the Darlington tube Q1 The base is connected, the emitter of the Darlington Q1 is connected to the power supply VDD through the resistor R1, the collector of the Darlington Q1 is grounded, and the emitter of the Darlington Q1 is also connected to the positive power supply of the air pump M terminal connection, the negative power supply terminal of the air pump M is grounded, The negative power supply terminal of the air pump M is grounded through a resistor R4, the remote end of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier U4B, the inverting input terminal of the operational amplifier U4B is connected to the reference voltage VREF, and the operational amplifier U4B The output terminal is connected with the IO port of the main control circuit, The resistor R4 is connected in series with the air pump M, the current flowing through the air pump M generates a voltage UR1 on the resistor R4, and the voltage UR1 is input to the non-inverting input terminal of the operational amplifier U4B; when the air pump M is in the working state, the voltage UR1 is greater than the reference voltage VREF, and the operational amplifier U4B Output high level; on the contrary, when the air pump M is not working, the voltage UR1 is less than the reference voltage VREF, the op amp U4B outputs low level; the output terminal of the op amp U4B is connected to the main control circuit, and the main control circuit calculates the high level time , to calculate the actual working time of the blood pressure monitor. 2. A portable blood pressure detector according to claim 1, wherein one end of the cuff is provided with a snap-fit ring, and the other end of the cuff is provided with a retaining portion, and the height of the retaining portion is greater than the height of the snap ring. 3. A portable blood pressure detector according to claim 2, wherein the stopper is made of elastic material. 4. A kind of portable blood pressure detector according to claim 1, is characterized in that, also comprises reference source circuit, and described reference source circuit comprises the resistance R6 of series connection and potentiometer RP1, and one end of described resistance R6 is connected with power supply VDD One end of the potentiometer RP1 is grounded, and the sliding end of the potentiometer RP1 is used as a reference voltage VREF to be connected to the inverting input end of the operational amplifier U4B. 5. A portable blood pressure detector according to claim 1, wherein a power switching circuit is also provided in the host, and the power switching circuit includes a triode Q7, a diode D1 and a diode D2, and the triode Q7 The emitter of the triode Q7 is connected to the positive pole of the battery B1, the base of the triode Q7 is connected to the power supply 3.3V through the diode D1 and the resistor R9 in turn, the collector of the triode Q7 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the power supply 3.3V connection, the cathode of the diode D2 is used as the output of the power switching circuit to supply power to the circuit components in the host.