CN220309117U

CN220309117U - Pressure pulse wave sensor

Info

Publication number: CN220309117U
Application number: CN202320724231.1U
Authority: CN
Inventors: 章年平; 黄智明; 龚大成
Original assignee: Shenzhen Ambo Health Technology Co ltd
Current assignee: Shenzhen Ambo Health Technology Co ltd
Priority date: 2023-02-07
Filing date: 2023-03-30
Publication date: 2024-01-09
Anticipated expiration: 2033-03-30
Also published as: CN116509352A

Abstract

The utility model discloses a pressure pulse wave sensor for detecting arterial pressure pulse wave signals by using a tension method, which comprises a pressure sensor and an analog switch; the pressure sensor comprises at least three pressure sensing units; the pressure sensing unit comprises a piezoresistor; the piezoresistor is connected with the analog switch in series and used as a bridge arm to form a Wheatstone bridge, or the piezoresistor is used as a bridge arm to form a Wheatstone bridge, and the analog switch is connected with the Wheatstone bridge; the pressure signal is used for generating the pressure pulse wave signal of the artery through controlling the on-off control of the analog switch, and the pressure sensing unit works partially or completely according to the time sharing as required, so that the power consumption of the pressure sensor is reduced, the power consumption of the whole pressure pulse wave sensor is further reduced, and further the continuous voyage time of the pressure pulse wave sensor is improved and better user experience is obtained.

Description

Pressure pulse wave sensor

Technical Field

The utility model relates to the field of tension method pulse wave measurement and blood pressure measurement, in particular to a tension method pressure pulse wave sensor.

Background

The pressure pulse wave comprises extremely rich biological health information, and the plane tension method is a very effective method for detecting the pressure on the vessel wall caused by the blood flow in the arterial vessel; the blood pressure can be further calculated through the pressure pulse wave, namely the accuracy and the continuity of the invasive blood pressure measurement are achieved, the comfort of the noninvasive blood pressure measurement is achieved, and the rapidity of the blood pressure measurement can be realized. Therefore, detecting the pressure pulse wave by the planar tension method is a significant problem for those skilled in the art.

The current pressure pulse wave sensor adopts a plurality of sensors or sensing units in an array; the pressure signals are detected simultaneously by adopting the plurality of sensors or the sensing units in the array mode so as to detect the pressure pulse wave signals of the artery, so that the power consumption is high, and the heat is easy to generate.

Disclosure of Invention

The pressure pulse wave sensor provided by the utility model is used for solving the problems of high power consumption and easiness in heating.

In one embodiment of the present utility model, there is provided a pressure pulse wave sensor for detecting a pressure pulse wave signal of an artery, including: the power supply input device, the control connection terminal, the pressure sensor, the analog switch and the output connection terminal;

the power input device comprises a power input end, a power output end and a power ground, and is used for inputting power from the outside and providing power for the pressure pulse wave sensor;

the pressure sensor comprises at least three pressure sensing units, wherein the pressure sensing units are used for detecting first pressure signals, and the first pressure signals are used for generating pressure pulse wave signals of arteries; the pressure sensing unit comprises a piezoresistor; the piezoresistor is connected with the analog switch in series and used as a bridge arm to form a Wheatstone bridge, or the piezoresistor is used as a bridge arm to form a Wheatstone bridge, and the analog switch is connected with the Wheatstone bridge; the wheatstone bridge includes: a first node, a second node, a third node, and a fourth node, the first node being opposite the third node, the second node being opposite the fourth node;

The analog switch is provided with a control end;

the control connection terminal controls the on-off of the analog switch through the control end and controls the pressure sensing unit to detect the first pressure signal;

the output connection terminal is used for outputting the first pressure signal.

In one embodiment, the analog switches include a first analog switch, a second analog switch, a third analog switch, and a fourth analog switch;

at least three nodes of the wheatstone bridge are respectively connected with the analog switch, and the wheatstone bridge comprises:

the first node is connected with the power supply output end through the first analog switch, and/or the third node is connected with the power supply ground through the third analog switch;

and the second node is connected with the output connection terminal through the second analog switch, and the fourth node is connected with the output connection terminal through the fourth analog switch.

In one embodiment, the device further comprises a decoder, wherein the control connection terminal is connected with the control end of the analog switch through the decoder; the decoder receives the control signal from the control connection terminal, decodes the control signal and outputs a decoded signal, and the control connection terminal controls the pressure sensing unit to detect the first pressure signal through the decoder.

In one embodiment, the analog switch and the decoder are integrated as an analog multiplexer.

In one embodiment, the constant current driving circuit further comprises a constant current driving circuit, wherein the constant current driving circuit comprises a sampling resistor; the constant current driving circuit is connected with the power input device and the Wheatstone bridge;

the constant current drive circuit is connected with the Wheatstone bridge, and comprises: the output of the constant current driving circuit is directly or indirectly connected with the first node of the Wheatstone bridge, and the third node of the Wheatstone bridge is directly or indirectly connected with the power ground through the sampling resistor.

In one embodiment, the system further comprises an analog preprocessing unit; the analog preprocessing unit is connected with the output connecting terminal; the second node is directly or indirectly connected with the analog preprocessing unit, and the fourth node is directly or indirectly connected with the analog preprocessing unit; the analog preprocessing unit is used for acquiring the first pressure signal from the pressure sensor, amplifying the first pressure signal to obtain a second pressure signal, and the output connecting terminal is used for outputting the second pressure signal.

In one embodiment, the system further comprises a digital preprocessing unit; the digital preprocessing unit is arranged between the analog preprocessing unit and the output connection terminal; the digital preprocessing unit is used for acquiring the second pressure signal from the analog preprocessing unit; converting the second pressure signal into a first pressure digital signal; the output connection terminal is used for outputting the first pressure digital signal.

In one embodiment, the power input device further includes the power management device, where the power management device is connected to the power input terminal, the power output terminal, and the power ground, and is configured to manage an externally input power.

In one embodiment, the pressure sensing unit is an absolute pressure sensing unit.

In one embodiment, the device further comprises an atmospheric pressure sensor connected to the output connection terminal, the atmospheric pressure sensor being used for measuring the ambient atmospheric pressure;

and/or, the device further comprises a temperature sensor, wherein the temperature sensor is connected with the output connection terminal, is arranged close to the pressure sensor and is used for measuring the temperature of the pressure sensor;

And/or, the pressure pulse wave sensor further comprises a start-stop switch, wherein the start-stop switch is connected with the power input device and is used for controlling the start and the stop of the pressure pulse wave sensor.

In one embodiment of the present utility model, there is provided a pressure pulse wave sensor including: the power supply input device, the pressure sensor, the analog switch, the first processor and the signal interface;

the pressure sensor comprises at least three pressure sensing units, wherein the pressure sensing units are used for detecting a third pressure signal, and the third pressure signal is used for generating a pressure pulse wave signal of an artery; the pressure sensing unit comprises a piezoresistor; the piezoresistor is connected with the analog switch in series and used as a bridge arm to form a Wheatstone bridge, or the piezoresistor is used as a bridge arm to form a Wheatstone bridge, and the analog switch is connected with the Wheatstone bridge; the wheatstone bridge includes: a first node, a second node, a third node, and a fourth node, the first node being opposite the third node, the second node being opposite the fourth node;

The analog switch is provided with a control end;

the first processor is connected with the control end of the analog switch, controls the on-off of the analog switch through the control end, and controls the pressure sensing unit to detect the third pressure signal;

the first processor further comprises an analog preprocessing unit, a digital preprocessing unit and a calculation processing unit which are sequentially connected; the analog preprocessing unit receives the third pressure signal from the selected pressure sensing unit, amplifies the third pressure signal to obtain a fourth pressure signal, and the digital preprocessing unit converts the fourth pressure signal into a second pressure digital signal; the processing unit calculates the blood pressure value according to the second pressure digital signal;

the signal interface is connected with the first processor, and the first processor is communicated with the outside through the signal interface and outputs the second pressure digital signal and the blood pressure value.

and the second node is connected with the first processor through the second analog switch, and the fourth node is connected with the first processor through the fourth analog switch.

In one embodiment, the analog switch and the first processor are integrally integrated as a second processor;

and/or the pressure sensor, the analog switch and the first processor are integrated into a first integrated pressure pulse wave sensor.

In one embodiment, the device further comprises a decoder, and the first processor is connected with the control end of the analog switch through the decoder; the decoder receives the control signal from the first processor, decodes the control signal and outputs a decoded signal, and the first processor controls the pressure sensing unit to output the third pressure signal through the decoder.

In one embodiment, the analog switch and the decoder are integrated as an analog multiplexer;

and/or the analog switch, the decoder and the first processor are integrated into a third processor;

And/or the pressure sensor, the analog switch, the decoder and the first processor are integrated into a second integrated pressure pulse wave sensor.

In one embodiment, the constant current source driving circuit, the analog switch, the decoder, and the first processor are integrally integrated into a fourth processor;

and/or the pressure sensor, the constant current source driving circuit, the analog switch, the decoder and the first processor are integrated into a third integrated pressure pulse wave sensor.

In one embodiment, the signal interface comprises a wireless communication device; the wireless communication device is coupled to the first processor.

In one embodiment, the wireless communication device, the constant current source driving circuit, the analog switch, the decoder, and the first processor are integrally integrated into a fifth processor;

and/or the pressure sensor, the wireless communication device, the constant current source driving circuit, the analog switch, the decoder and the first processor are integrated into a fourth integrated pressure pulse wave sensor;

In one embodiment, the power management device, the wireless communication device, the constant current source driving circuit, the analog switch, the decoder, and the first processor are integrally integrated into a sixth processor;

and/or the pressure sensor, the power management device, the wireless communication device, the constant current source driving circuit, the analog switch, the decoder and the first processor are integrated into a fifth integrated pressure pulse wave sensor.

In one embodiment, the device further comprises an atmospheric pressure sensor connected to the output connection terminal or the first processor, the atmospheric pressure sensor being configured to measure ambient atmospheric pressure;

and/or, further comprising a temperature sensor connected to the output connection terminal or the first processor, the temperature sensor being disposed proximate to the pressure sensor, the temperature sensor being configured to measure a temperature of the pressure sensor;

and/or, the device further comprises a start-stop switch, wherein the start-stop switch is connected with the first processor or the power input device and is used for controlling the start and the stop of the pressure pulse wave sensor.

The beneficial effects of this application are:

the pressure pulse wave sensor provided by the utility model comprises a pressure sensor and an analog switch; the pressure sensor comprises at least three pressure sensing units; the pressure sensing unit comprises a piezoresistor; the piezoresistor is connected with the analog switch in series and used as a bridge arm to form a Wheatstone bridge, or the piezoresistor is used as a bridge arm to form a Wheatstone bridge, and the analog switch is connected with the Wheatstone bridge; the on-off of the analog switch is controlled, so that the pressure sensing unit can be controlled to detect the pressure signal according to the preset time sequence, the pressure signal is used for generating the pressure pulse wave signal of the artery, the pressure sensing unit works partially or completely according to the time sharing as required, the power consumption of the pressure sensor is reduced, the power consumption of the whole pressure pulse wave sensor is further reduced, and further the continuous voyage time of the pressure pulse wave sensor is improved and better user experience is obtained.

Drawings

FIG. 1a is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 1b is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 1c is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 1d is a schematic diagram of a circuit structure of a pressure sensing unit according to an embodiment;

FIG. 2 is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 3 is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 4 is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 5a is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 5b is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 6 is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 7 is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 8 is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 9 is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 10 is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

FIG. 11 is a schematic circuit diagram of a pressure pulse wave sensor according to an embodiment;

FIG. 12 is a schematic diagram of a circuit structure of a pressure pulse wave sensor according to an embodiment;

wherein the reference numerals are as follows:

2100-power input device, 2101-power input, 2102-power output, 2103-power ground, 2110-power management device, 2200-control connection terminal, 2300-pressure sensor, 2310-first pressure sensing unit, 2310 a-first varistor, 2310 b-second varistor, 2310 c-first fixed resistor, 2310 d-second fixed resistor, 2311-first node, 2312-second node, 2313-third node, 2314-fourth node, 2400-analog switch, 2411-first analog switch, 2412-second analog switch, 2413-third analog switch, 2414-fourth analog switch, 2500-output connection terminals, 2600-decoders, 2700-constant current driving circuits, 2710-sampling resistors, 2800-analog preprocessing units, 2900-digital preprocessing units, 3500-first processors, 3200-signal interfaces, 3800-wireless communication devices, 4390-barometric pressure sensors, 3900-temperature sensors, 4001-switches, R1-first piezoresistors, R2-second piezoresistors, R3-third piezoresistors, R4-fourth piezoresistors, R0+ -first compensation resistors, R0-second compensation resistors, R5-first voltage limiting resistors and R6-second voltage limiting resistors.

Detailed Description

The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.

Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.

Embodiment one:

the present embodiment provides a pressure pulse wave sensor, which is mainly used for detecting the pressure pulse wave signal of an artery, and can calculate the blood pressure value and other more specific physiological parameters according to the pressure pulse wave signal. The pressure pulse wave sensor is provided with the Wheatstone bridge and the analog switch, the analog switch is connected with the Wheatstone bridge, the pressure sensing units can be controlled to detect pressure signals by controlling the on-off of the analog switch, namely, partial or all the pressure sensing units can be controlled to detect the pressure signals simultaneously or respectively by controlling the analog switch, for example, the pressure signals detected by a plurality of the pressure sensing units according to a preset time sequence are controlled, the pressure signals can be used for generating arterial pressure pulse wave signals, all the pressure sensing units do not need to work in full time, on the basis of accurately detecting the pressure signals, each pressure sensing unit works in a time-sharing mode, the power consumption of the pressure pulse wave sensor is reduced, the heating of the pressure pulse wave sensor is reduced, and further the continuous time of the pressure pulse wave sensor is improved, and better user experience is obtained.

Referring to fig. 1a, the pressure pulse wave sensor mainly includes a power input device 2100, a control connection terminal 2200, a pressure sensor 2300, an analog switch 2400, and an output connection terminal 2500.

The pressure pulse wave sensor may further include a housing and other physical components, and the power input device 2100, the control connection terminal 2200, the pressure sensor 2300, the analog switch 2400, and the output connection terminal 2500 are all installed in the housing, wherein the control connection terminal 2200 and the output connection terminal 2500 may be exposed to the housing, wired communication may be used, and the control connection terminal 2200 and the output connection terminal 2500 may also be located in the housing, wireless communication may be used.

The power input device 2100 includes a power input terminal 2101, a power output terminal 2102 and a power ground 2103, the power input terminal 2101 and the power ground 2103 are used for being connected with an external power source, the power output terminal 2102 and the power ground 2103 are respectively connected with other components inside the pressure pulse wave sensor, and the power input device 2100 inputs power from the external source and provides power for the pressure pulse wave sensor.

The control connection terminal 2200 includes a control line, and the control connection terminal 2200 is configured to acquire a control signal for controlling the pressure sensing unit to detect the first pressure signal in time sequence from the outside.

The pressure sensor 2300 includes at least three pressure sensing units, for example, the pressure sensor 2300 includes four pressure sensing units, each of the four pressure sensing units includes a first pressure sensing unit 2310, a second pressure sensing unit, a third pressure sensing unit, and a fourth pressure sensing unit, which are not shown in the drawing, and the connection manner of the second pressure sensing unit, the third pressure sensing unit, and the fourth pressure sensing unit with other components is the same as that of the first pressure sensing unit 2310, and the plurality of pressure sensing units may be arranged in an array manner. Each pressure sensing unit comprises four piezoresistors, the four piezoresistors form a Wheatstone bridge with bridge arms and nodes, and the four piezoresistors comprise four bridge arms and four nodes, such as: each piezoresistor is positioned on one bridge arm and four bridge arms which are connected end to end in sequence; the nodes include a first node 2311, a second node 2312, a third node 2313, and a fourth node 2314, wherein the first node 2311 is opposite the third node 2313 and the second node 2312 is opposite the fourth node 2314. Each node is located between two piezoresistors.

The analog switch 2400 includes a first analog switch 2411, a second analog switch 2412, a third analog switch 2413, and a fourth analog switch 2414, where the first analog switch 2411, the second analog switch 2412, the third analog switch 2413, and the fourth analog switch 2414 each have a control end for controlling on-off (on and off) of the first analog switch 2411, the second analog switch 2412, the third analog switch 2413, and the fourth analog switch 2414, respectively.

At least three nodes of the wheatstone bridge are respectively connected with the analog switch 2400, wherein four nodes of the preferred wheatstone bridge are respectively connected with four analog switches of the analog switch 2400 in a one-to-one correspondence. The specific connection relation comprises: the first node 2311 is connected to the power output 2102 through a first analog switch 2411, and the third node 2313 is connected to the power ground 2103 through a third analog switch 2413; and, the second node 2312 is connected to the output connection terminal 2500 through a second analog switch 2412, and the fourth node 2314 is connected to the output connection terminal 2500 through a fourth analog switch 2414.

The control connection terminal 2200 is connected to the control ends of the first analog switch 2411, the second analog switch 2412, the third analog switch 2413 and the fourth analog switch 2414 through control lines thereof, and the control connection terminal 2200 simultaneously controls the on-off of the first analog switch 2411, the second analog switch 2412, the third analog switch 2413 and the fourth analog switch 2414 through the acquired external control signals, so that the pressure sensing unit can be further controlled to detect the first pressure signal according to a preset time sequence. Wherein, pressure sensor 2300 includes a plurality of pressure sensing units, and every pressure sensing unit is used for detecting pressure signal, and the external control signal that control connection terminal 2200 obtained is used for controlling a plurality of pressure sensing units to detect according to the preset time sequence, includes: only three pressure sensing units are required to detect the pressure signal.

The output connection terminal 2500 includes a first input terminal, a second input terminal, and an output terminal, the first input terminal of the output connection terminal 2500 is connected with the second analog switch 2412, the second input terminal of the output connection terminal 2500 is connected with the fourth analog switch 2414, the output connection terminal 2500 obtains a first pressure signal through the first input terminal and the second input terminal, and outputs the first pressure signal through the output terminal. The first pressure signal is output for subsequent signal processing.

In this embodiment, since the piezoresistor of the pressure sensor 2300 forms a wheatstone bridge with a bridge arm and a node, the control connection terminal 2200 can further control the pressure sensing unit to detect the first pressure signal according to the predetermined time sequence by controlling the on-off of the analog switch 2400, and the partial pressure sensing unit or all the pressure sensing units are required to detect, so that the whole pressure sensing unit in the whole time period is not required to work, the power consumption of the pressure sensor 2300 is reduced, the power consumption of the whole pressure pulse wave sensor is further reduced, and further the duration of the pressure pulse wave sensor is improved and better user experience is obtained. The sampling frequency can be increased, and the pressure signal can be detected according to a preset time sequence under the condition of multiple channels, so that the power consumption caused by the simultaneous access of all channels can be reduced, and the number and the power consumption of the analog preprocessors and the digital preprocessors can be reduced; the data of all channels and each channel can be considered, so that the accuracy of pressure pulse wave signal detection is guaranteed.

Referring to fig. 1b, in other embodiments, three nodes of the wheatstone bridge are connected to the analog switches 2400, and the on-off of the three analog switches can satisfy the control of the wheatstone bridge, so that the pressure sensing unit can also be controlled to detect the first pressure signal according to the predetermined time sequence.

Wherein the first node 2311 is connected to the power output 2102 via the first analog switch 2411, and the third node 2313 is connected to the power ground 2103; and, the second node 2312 is connected to the output connection terminal 2500 through a second analog switch 2412, and the fourth node 2314 is connected to the output connection terminal 2500 through a fourth analog switch 2414.

Referring to fig. 1c, in other embodiments, three nodes of the wheatstone bridge are connected to the analog switches 2400, respectively, and the on-off of the three analog switches can satisfy the control of the wheatstone bridge, so that the pressure sensing unit can also be controlled to detect the first pressure signal according to the predetermined time sequence.

The first node 2311 is connected to the power output 2102, and the third node 2313 is connected to the power ground 2103 through a third analog switch 2413; and, the second node 2312 is connected to the output connection terminal 2500 through a second analog switch 2412, and the fourth node 2314 is connected to the output connection terminal 2500 through a fourth analog switch 2414.

In other embodiments, the pressure sensing unit within pressure sensor 2300 may be an absolute pressure sensing unit, which has the advantage of being small in size. The minimum diameter of the artery blood vessel is approximately 1.6mm, the size of the pressure sensing unit needs to be reduced as much as possible, the absolute pressure sensing unit is suitable for detecting pulse wave signals of the artery blood vessel with small diameter, and meanwhile, the size of the pressure sensing unit is reduced, the volume of the pressure sensor 2300 is reduced, the volume of the pressure pulse wave sensor is reduced, and the miniaturization of the pressure pulse wave sensor is realized.

Referring to fig. 1d, in other embodiments, the pressure sensing unit of the pressure sensor 2300 is provided with a temperature compensation function, such as a first pressure sensing unit 2310, where the first pressure sensing unit 2310 includes a first varistor R1, a second varistor R2, a third varistor R3 and a fourth varistor R4, the first varistor R1 is connected with a first compensation resistor r0+ in parallel, the second varistor R2 is connected with a second compensation resistor R0-in parallel, and/or the first node 2311 of the wheatstone bridge is connected with a first voltage limiting resistor R5 in series, and/or the third node 2313 of the wheatstone bridge is connected with a second voltage limiting resistor R6 in series, and through the combined use of the compensation resistor and the voltage limiting resistor, temperature compensation is performed, so that the pressure sensor 2300 can ensure its accuracy within a certain temperature range, and can improve the accuracy and stability of detecting the pressure pulse wave signal of the pressure sensor 2300.

Embodiment two:

the present embodiment provides a pressure pulse wave sensor, which is different from the first embodiment in that: the analog switch is connected with piezoresistors in series to form bridge arms of the Wheatstone bridge.

Referring to fig. 2, the pressure pulse wave sensor mainly includes a power input device 2100, a control connection terminal 2200, a pressure sensor 2300, an analog switch 2400, and an output connection terminal 2500.

The pressure pulse wave sensor may further include a housing and other physical components, wherein the power input device 2100, the control connection terminal 2200, the pressure sensor 2300, the analog switch 2400, and the output connection terminal 2500 are all installed in the housing, wherein the control connection terminal 2200 and the output connection terminal 2500 may be exposed out of the housing to use wired communication, and the control connection terminal 2200 and the output connection terminal 2500 may also be located in the housing to use wireless communication.

The control connection terminal 2200 includes a control line, and the control connection terminal 2200 is configured to acquire an external control signal for controlling the pressure sensing unit to detect the first pressure signal at a predetermined timing.

The pressure sensor 2300 includes at least three pressure sensing units, for example, the pressure sensor 2300 includes four pressure sensing units, each of the four pressure sensing units includes a first pressure sensing unit 2310, a second pressure sensing unit, a third pressure sensing unit, and a fourth pressure sensing unit, which are not shown in the drawing, and the connection manner of the second pressure sensing unit, the third pressure sensing unit, and the fourth pressure sensing unit with other components is the same as that of the first pressure sensing unit 2310, and the plurality of pressure sensing units may be arranged in an array manner. Each pressure sensing unit includes two piezoresistors, and the pressure sensing unit 2310 includes a first piezoresistor 2310a and a second piezoresistor 2310b.

The analog switch 2400 includes a first analog switch 2411 and a second analog switch 2412, where the first analog switch 2411 and the second analog switch 2412 each have a control terminal for controlling on-off (on and off) of the first analog switch 2411 and the second analog switch 2412, respectively.

The two piezoresistors and the two fixed resistors are used as bridge arms to form a Wheatstone bridge with bridge arms and nodes, the two fixed resistors comprise a first fixed resistor 2310c and a second fixed resistor 2310d, the two fixed resistors comprise four bridge arms and four nodes, and the four bridge arms are connected end to end in sequence; the nodes include a first node 2311, a second node 2312, a third node 2313, and a fourth node 2314, wherein the first node 2311 is opposite the third node 2313 and the second node 2312 is opposite the fourth node 2314. The first node 2311 is located between the first varistor 2310a and the first fixed resistor 2310c, the second node 2312 is located between the first fixed resistor 2310c and the second fixed resistor 2310d, the third node 2313 is located between the second fixed resistor 2310d and the second varistor 2310b, and the fourth node 2314 is located between the first varistor 2310a and the second varistor 2310 b.

The first analog switch 2411 is connected in series with the first piezo-resistor 2310a, the first analog switch 2411 is located between the first piezo-resistor 2310a and the fourth node 2314; the second analog switch 2412 is connected in series with the second piezo-resistor 2310b, the second analog switch 2412 is located between the second piezo-resistor 2310b and the third node 2313.

The control connection terminal 2200 is connected to the control ends of the first analog switch 2411 and the second analog switch 2412 through control lines, and the control connection terminal 2200 simultaneously controls the on-off of the first analog switch 2411 and the second analog switch 2412 through the acquired control signals, so that the pressure sensing unit can be further controlled to detect the first pressure signal according to a preset time sequence. Wherein, pressure sensor 2300 includes a plurality of pressure sensing units, and every pressure sensing unit is used for detecting pressure signal, and the control signal that control connection terminal 2200 obtained is used for controlling a plurality of pressure sensing units to detect according to the preset time sequence, includes: only three pressure sensing units are required to detect the pressure signal.

The output connection terminal 2500 includes a first input terminal, a second input terminal, and an output terminal, the first input terminal of the output connection terminal 2500 is connected with the second node 2312, the second input terminal of the output connection terminal 2500 is connected with the fourth node 2314, the output connection terminal 2500 obtains a first pressure signal through the first input terminal and the second input terminal, and outputs the first pressure signal through the output terminal. The first pressure signal is output for subsequent signal processing.

In other embodiments, a third analog switch may be added between the first node 2311 and the power output 2102 and/or a fourth analog switch may be added between the third node 2313 and the power ground 2103; the control ends of the third analog switch and the fourth analog switch are connected with a control connection terminal 2200; the control connection terminal 2200 controls the on/off of the first analog switch 2411 and the second analog switch 2412 and simultaneously controls the on/off of the third control analog switch and the fourth analog switch;

In this embodiment, since the piezoresistor and the fixed resistor of the pressure sensing unit form a wheatstone bridge with a bridge arm and a node, the control connection terminal 2200 can further control the pressure sensing unit to detect the first pressure signal according to the predetermined time sequence by controlling the on-off of the analog switch 2400, and detect part of the pressure sensing units or all of the pressure sensing units according to the requirement, so that the whole pressure sensing unit does not need to work in the whole time period, the power consumption of the pressure sensor 2300 is reduced, and the power consumption of the whole pressure pulse wave sensor is further reduced. The sampling frequency can be increased, and the analog preprocessing and the digital preprocessing can be reduced according to the preset time sequence under the condition of multiple channels, so that the power consumption caused by the simultaneous access of all channels can be reduced; and the data of all channels and each channel can be considered, so that the accuracy of pressure pulse wave signal detection is ensured. In other embodiments, the analog switch 2400 may include only one analog switch, one varistor in the wheatstone bridge is a variable resistor, and the other three varistors are fixed resistors, where the analog switch is connected in series with the variable resistor, and the wheatstone bridge formed by one analog switch, one varistor, and three fixed resistors can also control the pressure sensing unit to detect the first pressure signal according to the predetermined time sequence.

In other embodiments, the analog switch 2400 includes three analog switches, three piezoresistors in the wheatstone bridge are variable resistors, another resistor is a fixed resistor, the three analog switches are connected in series with the three variable resistors in a one-to-one correspondence manner, and the wheatstone bridge formed by the three analog switches, the three piezoresistors and the fixed resistor can also control the pressure sensing unit to detect the first pressure signal according to the predetermined time sequence.

In other embodiments, the analog switch 2400 includes four analog switches, where four piezoresistors in the wheatstone bridge are all variable resistors, the four analog switches are connected in series with the four variable resistors in a one-to-one correspondence manner, and the wheatstone bridge formed by the four analog switches and the four piezoresistors can also control the pressure sensing unit to detect the first pressure signal according to the predetermined timing sequence.

In other embodiments, such as those comprising 1 fixed resistor, 2 fixed resistors, or 3 fixed resistors, the 1 fixed resistor, 2 fixed resistors, or 3 fixed resistors may also form other wheatstone bridges with piezoresistors of other pressure sensing units.

Embodiment III:

the present embodiment provides a pressure pulse wave sensor, in which a decoder is added to any of the above embodiments, and the description will be given by taking the decoder added to the first embodiment as an example.

Referring to fig. 3, in the present embodiment, the pressure pulse wave sensor further includes a decoder 2600, the decoder 2600 is disposed between the control connection terminal 2200 and the analog switch 2400, the decoder 2600 is configured to decode an external control signal (such as a digital signal) obtained from the control connection terminal 2200 and output a decoded signal, the decoded signal is transmitted to the analog switch 2400, and the analog switch 2400 controls the on/off of the analog switch according to the input decoded signal.

The decoder 2600 is connected to the control connection terminal 2200 and the analog switch 2400. The decoder 2600 includes no fewer decoder outputs than the number of pressure sensing units, for example, thirty-two decoder outputs are provided for the thirty-two pressure sensing units, and one decoder output corresponds to one pressure sensing unit, so that the control connection terminal 2200 can simultaneously control a plurality of pressure sensing units through the decoder 2600.

The control connection terminal 2200 selects a corresponding pressure sensing unit through the decoder 2600 output. Specifically, at least 1 decoder output is connected to the control terminals of all analog switches associated with 1 wheatstone bridge, and the pressure sensing unit is controlled to detect the first pressure signal according to a predetermined time sequence by controlling the connection and disconnection of the analog switches.

In this embodiment, the decoder 2600 is provided between the control connection terminal 2200 and the analog switch 2400, which is advantageous in controlling the plurality of pressure sensing units in a large number by the control connection terminal 2200.

In other embodiments, the analog switch 2400 and the decoder 2600 can be integrated into an analog multiplexer, and the two can be integrated into a single integrated circuit, which is beneficial for implementing miniaturization of the pressure pulse wave sensor.

Embodiment four:

the present embodiment provides a pressure pulse wave sensor, in which a constant current drive circuit is added to any one of the above embodiments, and a description will be given by taking the example of adding the constant current drive circuit to the third embodiment.

Referring to fig. 4, a constant current driving circuit 2700 is disposed between the power input device 2100 and the wheatstone bridge, the constant current driving circuit 2700 includes a sampling resistor 2710, and the constant current driving circuit 2700 connects the power input device 2100 and the wheatstone bridge.

Specifically, the output of the constant current driving circuit 2700 is connected to the first node 2311 of the wheatstone bridge through the first analog switch 2411, and the third node 2313 of the wheatstone bridge is connected to the sampling resistor 2710 through the third analog switch 2413.

In this embodiment, a constant current driving circuit 2700 is disposed between the power input device 2100 and the wheatstone bridge to provide constant current driving for the pressure pulse wave sensor, especially, the pressure sensing unit adopts constant current driving to reduce temperature dependence in a certain temperature range (such as 0-50 ℃), so as to improve accuracy and stability of detection of the pressure sensing unit; and the Wheatstone bridge shares the same constant current driving circuit, which is beneficial to reducing the volume of the pressure pulse wave sensor and realizing the miniaturization of the pressure pulse wave sensor.

Fifth embodiment:

the present embodiment provides a pressure pulse wave sensor, in which an analog preprocessing unit is added to any of the above embodiments, and an example of adding an analog preprocessing unit to the fourth embodiment is described.

Referring to fig. 5a, in the present embodiment, an analog preprocessing unit 2800 is disposed between the output connection terminal 2500 and the analog switch 2400, where the analog preprocessing unit 2800 is configured to amplify a first pressure signal detected by the pressure sensor 2300 to obtain a second pressure signal.

Specifically, the analog preprocessing unit 2800 has a first input terminal, a second input terminal, and an output terminal, the first input terminal of the analog preprocessing unit 2800 is connected to the second analog switch 2412, the second input terminal of the analog preprocessing unit 2800 is connected to the fourth analog switch 2414, and the output terminal of the analog preprocessing unit 2800 is connected to the output connection terminal 2500. The analog preprocessing unit 2800 acquires the first pressure signal detected by the pressure sensor 2300 through the first input terminal and the second input terminal, and the analog preprocessing unit 2800 amplifies the first pressure signal to obtain the second pressure signal and outputs the second pressure signal to the output connection terminal 2500 through the output terminal. The output connection terminal 2500 is used for outputting a second pressure signal to other devices.

In this embodiment, an analog preprocessing unit 2800 is disposed between the output connection terminal 2500 and the analog switch 2400, where the analog preprocessing unit 2800 amplifies the first pressure signal, so as to facilitate subsequent analog-to-digital conversion and other processing of the pressure signal.

Referring to fig. 5b, in other embodiments, the pressure pulse wave sensor further includes a digital preprocessing unit 2900, where the digital preprocessing unit 2900 is disposed between the analog preprocessing unit 2800 and the output connection terminal 2500, and the digital preprocessing unit 2900 is configured to convert an analog signal into a digital signal, that is, to convert a second pressure signal into a first pressure digital signal.

Specifically, the digital preprocessing unit 2900 has one input terminal and one output terminal, the input terminal of the digital preprocessing unit 2900 is connected to the output terminal of the analog preprocessing unit 2800, and the output terminal of the digital preprocessing unit 2900 is connected to the output connection terminal 2500. The digital preprocessing unit 2900 acquires a second pressure signal, converts the second pressure signal into a first pressure digital signal, and outputs the first pressure digital signal to the output connection terminal 2500, the output connection terminal 2500 being used to output the first pressure digital signal to other devices.

The digital preprocessing unit 2900 can convert an analog signal into a digital signal, and the digital signal has the advantages of high signal-to-noise ratio and stable signal in the propagation process, namely, the digital preprocessing unit 2900 is arranged to improve the stability of the signal output of the pressure pulse wave sensor.

In other embodiments, the analog pre-processing unit 2800 and the digital pre-processing unit 2900 may be integrated as a single module unit or even as a single integrated circuit, which may increase reliability while also facilitating miniaturization of the pressure pulse wave sensor.

Example six:

the present embodiment provides a pressure pulse wave sensor, which is mainly used for detecting pressure pulse wave signals of arteries, and calculating blood pressure values and other more specific physiological parameters according to the pressure pulse wave signals. The pressure pulse wave sensor is provided with the Wheatstone bridge and the analog switch, the analog switch is connected with the Wheatstone bridge, the pressure sensing units can be controlled to detect pressure signals by controlling the on-off of the analog switch, namely, partial or all the pressure sensing units can be controlled to detect the pressure signals simultaneously or respectively by controlling the analog switch, for example, the pressure signals detected by a plurality of the pressure sensing units according to a preset time sequence are controlled, the pressure signals can be used for generating arterial pressure pulse wave signals, all the pressure sensing units do not need to work in a full period, on the basis of accurately detecting pressure pulse waves, each pressure sensing unit works in a time-sharing mode, the power consumption of the pressure pulse wave sensor is reduced, the heating of the pressure pulse wave sensor is reduced, and further the cruising time of the pressure pulse wave sensor is improved, and better user experience is obtained.

Referring to fig. 6, the pressure pulse wave sensor mainly includes a power input device 2100, a pressure sensor 2300, an analog switch 2400, a first processor 3500 and a signal interface 3200. The pressure pulse wave sensor is provided with a processor, and an algorithm for detecting the third pressure signal according to a preset time sequence by the pressure sensing unit of the control pressure sensor 2300 is preset in the first processor 3500, so that the first processor 3500 can control the pressure sensing unit of the pressure sensor 2300 to detect the third pressure signal according to the preset time sequence.

The pressure pulse wave sensor may further include a housing and other physical components, wherein the power input device 2100, the pressure sensor 2300, the analog switch 2400, the first processor 3500, and the signal interface 3200 are all installed in the housing, wherein the signal interface 3200 may expose the housing and use wired communication, and the signal interface 3200 may also be located in the housing and use wireless communication.

The pressure sensor 2300 includes at least three pressure sensing units, for example, the pressure sensor 2300 includes four pressure sensing units, each of the four pressure sensing units includes a first pressure sensing unit 2310, a second pressure sensing unit, a third pressure sensing unit, and a fourth pressure sensing unit, which are not shown in the drawing, and the connection manner of the second pressure sensing unit, the third pressure sensing unit, and the fourth pressure sensing unit with other components is the same as that of the first pressure sensing unit 2310, and the plurality of pressure sensing units may be arranged in an array manner. Each pressure sensing unit comprises four piezoresistors, the four piezoresistors form a wheatstone bridge with bridge arms and nodes, the wheatstone bridge comprises four bridge arms and four nodes, the specific nodes comprise a first node 2311, a second node 2312, a third node 2313 and a fourth node 2314, the first node 2311 is opposite to the third node 2313, the second node 2312 is opposite to the fourth node 2314, and each node is located between two piezoresistors.

At least three nodes of the wheatstone bridge are respectively connected with the analog switch 2400, wherein four nodes of the preferred wheatstone bridge are respectively connected with four analog switches of the analog switch 2400 in a one-to-one correspondence. The specific connection relation comprises: the first node 2311 is connected to the power output 2102 through a first analog switch 2411, and the third node 2313 is connected to the power ground 2103 through a third analog switch 2413; and, the second node 2312 is connected to the first processor 3500 through a second analog switch 2412, and the fourth node 2314 is connected to the first processor 3500 through a fourth analog switch 2414.

The first processor 3500 is connected to a control terminal of the analog switch 2400, and the first processor 3500 can further control the pressure sensing unit to detect the third pressure signal according to a predetermined timing sequence by controlling the on/off of the analog switch 2400 of the wheatstone bridge.

Specifically, the first processor 3500 includes an input/output interface line, the input/output interface line is connected to a control end of the analog switch 2400, and the first processor 3500 controls the pressure sensing unit to detect the third pressure signal at a predetermined timing by controlling on and off of all analog switches 2400 associated with the wheatstone bridge.

The first processor 3500 further comprises an analog preprocessing unit, a digital preprocessing unit, and a calculation processing unit, where the analog preprocessing unit, the digital preprocessing unit, and the calculation processing unit are sequentially connected, the analog preprocessing unit is configured to receive a third pressure signal from the selected pressure sensing unit, amplify the third pressure signal to obtain a fourth pressure signal, and the analog preprocessing unit is further configured to transmit the fourth pressure signal to the digital preprocessing unit; the digital preprocessing unit is used for converting the analog signal into a digital signal, converting the fourth pressure signal into a second pressure digital signal and transmitting the second pressure digital signal to the calculation processing unit; the calculation processing unit is used for calculating the blood pressure value and/or other life parameters according to the second pressure digital signal. The first processor 3500 is configured to output a second pressure digital signal and/or a blood pressure value, wherein the second pressure digital signal may be further configured to be transmitted to other devices for further recording and calculating other vital parameters, and wherein the blood pressure value may be directly configured for presentation to a user.

The signal interface 3200 is connected to the first processor 3500, and the first processor 3500 communicates with the outside through the signal interface, and outputs a second pressure digital signal and/or a blood pressure value.

In this embodiment, since the piezoresistors of the pressure sensing unit form a wheatstone bridge with bridge arms and nodes, the analog switch 2400 is connected to the nodes of the wheatstone bridge, and the first processor 3500 can further control the pressure sensing unit to detect the third pressure signal according to the predetermined time sequence by controlling the on-off of the analog switch 2400, part of the pressure sensing units or all of the pressure sensing units work as required, and all of the pressure sensing units do not need to detect in the whole period, so that the power consumption of the pressure sensor 2300 is reduced, and the power consumption of the whole pressure pulse wave sensor is further reduced. And, the first processor 3500 can convert the detected third pressure signal into a second pressure digital signal and calculate a blood pressure value, so that the pressure pulse wave sensor can output the second pressure digital signal and the blood pressure value, provide more information output, and can satisfy more usage scenarios, for example, the pressure pulse wave sensor can directly transmit the blood pressure value to the display device for display, and can transmit the second pressure digital signal to the device with the processor, and the external device can calculate the corresponding blood pressure value and other life parameters through the second pressure digital signal according to the requirement.

In other embodiments, the analog switch 2400 and the first processor 3500 are integrated into a second processor, i.e., the analog switch 2400 is integrated into the first processor 3500, which can shorten the length of the connection between the components, thereby increasing the reliability and reducing the volume of the pressure pulse wave sensor.

In other embodiments, the pressure sensor 2300, the analog switch 2400 and the first processor 3500 are integrated into a first integrated pressure pulse wave sensor, and the pressure sensor 2300, the analog switch 2400 and the first processor 3500 are integrated into a module unit or even integrated into a single integrated circuit, so that the length of a plurality of connecting lines between the pressure sensor 2300 and other components can be reduced, the distance between the first processor 3500 and the analog switch 2400 for transmitting control signals can be reduced, the interference introduced when the first processor 3500 controls the pressure sensing unit of the pressure sensor 2300 to detect in time sequence can be effectively avoided, the control stability can be improved, and the volume of the pressure pulse wave sensor can be reduced.

In other embodiments, the first processor 3500 may be provided with multiple analog preprocessing units and multiple digital preprocessing units, each for amplifying and digital-to-analog preprocessing the third pressure signals detected by the multiple pressure sensing units.

Embodiment seven:

the present embodiment provides a pressure pulse wave sensor, and a decoder is added to the pressure pulse wave sensor according to the sixth embodiment.

Referring to fig. 7, in the present embodiment, the pressure pulse wave sensor further includes a decoder 2600, the decoder 2600 is disposed between the first processor 3500 and the analog switch 2400, the decoder 2600 is configured to decode a control signal output from the first processor 3500 and output a decoded signal, the decoded signal is transmitted to the analog switch 2400, and the analog switch 2400 controls the analog switch 2400 to be turned on or off according to the input decoded signal.

The decoder 2600 is connected to the first processor 3500 and the analog switch 2400. The decoder 2600 includes no fewer decoder outputs than the number of pressure sensing units, for example, thirty-two decoder outputs are provided for the thirty-two pressure sensing units, and one decoder output corresponds to one pressure sensing unit, so that the first processor 3500 can control a plurality of pressure sensing units simultaneously through the decoder 2600.

The first processor 3500 selects a corresponding pressure sensing unit through the output of the decoder 2600. Specifically, the output of at least 1 decoder is connected to the control terminals of all analog switches associated with 1 wheatstone bridge, and the pressure sensing unit is controlled to detect the third pressure signal according to a predetermined time sequence by controlling the connection and disconnection of the analog switches.

In this embodiment, the decoder 2600 is disposed between the first processor 3500 and the analog switch 2400, which is advantageous for the control of a plurality of pressure sensing units by the first processor 3500.

In other embodiments, the analog switch 2400, the decoder 2600, and the first processor 3500 are integrated into a third processor, i.e., the analog switch 2400 and the decoder 2600 are integrated into the first processor 3500, so that the length of the connection line between the components can be shortened, which can increase the reliability and also facilitate the reduction of the volume of the pressure pulse wave sensor.

In other embodiments, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a second integrated pressure pulse wave sensor, and the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a module unit or even into a single integrated circuit, so that the length of a plurality of connecting lines between the pressure sensor 2300 and other components can be reduced, the distance between the first processor 3500 and the analog switch 2400 for transmitting control signals can be reduced, the interference introduced when the first processor 3500 controls the pressure sensing unit of the pressure sensor 2300 to detect according to time sequence can be effectively avoided, the stability of control can be improved, and the reliability can be increased, and meanwhile, the volume of the pressure pulse wave sensor can be reduced advantageously.

Example eight:

the present embodiment provides a pressure pulse wave sensor, in which a constant current drive circuit is added on the basis of the seventh embodiment, and the description is given by taking the example of adding the constant current drive circuit on the basis of the seventh embodiment.

Referring to fig. 8, a constant current driving circuit 2700 is disposed between the power input device 2100 and the wheatstone bridge, the constant current driving circuit 2700 includes a sampling resistor 2710, and the constant current driving circuit 2700 connects the power input device 2100 and the wheatstone bridge.

In this embodiment, a constant current driving circuit 2700 is disposed between the power input device 2100 and the wheatstone bridge to provide constant current driving for the pressure pulse wave sensor, especially, the pressure sensing unit has a temperature dependence on a normal piezoresistor, and the temperature dependence can be reduced in a certain temperature range (such as 0-50 ℃) by adopting constant current driving, so that the accuracy and stability of the detection of the pressure sensing unit can be improved.

In other embodiments, the analog switch 2400, the constant current driving circuit 2700, the decoder 2600 and the first processor 3500 are integrated into a fourth processor, that is, the analog switch 2400, the decoder 2600 and the constant current driving circuit 2700 are integrated into the first processor 3500, which can shorten the connection distance between the components and is beneficial to reducing the volume of the pressure pulse wave sensor.

In other embodiments, the constant current driving circuit 2700, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a third integrated pressure pulse wave sensor, the constant current driving circuit 2700, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a module unit or even into a single integrated circuit, so that the length of a plurality of connecting lines between the pressure sensor 2300 and other components can be reduced, the distance between the first processor 3500 for transmitting control signals to the analog switch 2400 is reduced, the interference introduced when the pressure sensing unit of the pressure sensor 2300 is controlled by the first processor 3500 in time sequence detection is effectively avoided, the control stability is improved, and the volume of the pressure pulse wave sensor is reduced; and the Wheatstone bridge shares the same constant current driving circuit, which is also beneficial to reducing the volume of the pressure pulse wave sensor and realizing the miniaturization of the pressure pulse wave sensor.

Example nine:

the present embodiment provides a pressure pulse wave sensor in which a wireless communication device is added to any of the above embodiments, and an example in which a wireless communication device is added to the eighth embodiment is described.

Referring to fig. 9, in the present embodiment, the signal interface 3200 further includes a wireless communication device 3800, the wireless communication device 3800 is connected to the power input device 2100 and the first processor 3500, and the wireless communication device 3800 is used for communicating with the outside, such as transmitting the second pressure digital signal and the blood pressure value to the outside through wireless transmission.

In this embodiment, the wireless communication device 3800 is provided, which increases a wireless communication mode, and can communicate with an external device with wireless communication, so as to facilitate use by a user.

In other embodiments, the analog switch 2400, the constant current driving circuit 2700, the wireless communication device 3800, the decoder 2600 and the first processor 3500 are integrated into a fifth processor, that is, the analog switch 2400, the wireless communication device 3800, the decoder 2600 and the constant current driving circuit 2700 are integrated into the first processor 3500, so that the connection distance between the components can be shortened, and the volume of the pressure pulse wave sensor can be reduced.

In other embodiments, the wireless communication device 3800, the constant current driving circuit 2700, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a fourth integrated pressure pulse wave sensor, and the wireless communication device 3800, the constant current driving circuit 2700, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a module unit or even into a single integrated circuit, so that the length of a plurality of connecting lines between the pressure sensor 2300 and other components can be reduced, the distance between the first processor 3500 for transmitting control signals to the analog switch 2400 can be reduced, the interference introduced when the pressure sensing unit of the pressure sensor 2300 is controlled by the first processor 3500 to detect according to a predetermined time sequence can be effectively avoided, the control stability can be improved, and the reliability can be increased, and the volume of the pressure pulse wave sensor can be reduced.

Example ten:

the present embodiment provides a pressure pulse wave sensor in which a power management device is added to any of the above embodiments, and a description will be given of an example in which a power management device is added to the ninth embodiment.

Referring to fig. 10, in this embodiment, the power input device 2100 further includes a power management device 2110, where the power management device 2110 is connected to the power input terminal 2101, the power output terminal 2102 and the power ground 2103, and the power management device 2110 is configured to manage an externally input power, for example, perform a voltage conversion process on the externally input power, so that the power input with any voltage is converted into a voltage power that can be adapted to the pressure pulse wave sensor.

In this embodiment, the power management device 2110 is added, so that the adaptability of the pressure pulse wave sensor to the input power can be improved, and the reliability of the pressure pulse wave sensor can be improved.

In other embodiments, the analog switch 2400, the constant current driving circuit 2700, the wireless communication device 3800, the decoder 2600, the power management device 2110 and the first processor 3500 are integrated into a sixth processor, that is, the analog switch 2400, the constant current driving circuit 2700, the wireless communication device 3800, the decoder 2600 and the power management device 2110 are integrated into the first processor 3500, so that the length of the connection line between the components can be shortened, thereby increasing the reliability and also being beneficial to reducing the volume of the pressure pulse wave sensor.

In other embodiments, the power management device 2110, the wireless communication device 3800, the constant current driving circuit 2700, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a fifth integrated pressure pulse wave sensor, and the power management device 2110, the wireless communication device 3800, the constant current driving circuit 2700, the pressure sensor 2300, the analog switch 2400, the decoder 2600 and the first processor 3500 are integrated into a module unit or even into a single integrated circuit, so that the length of a plurality of connecting lines between the pressure sensor 2300 and other components can be reduced, the distance between the first processor 3500 for transmitting control signals to the analog switch 2400 can be reduced, the interference introduced when the pressure sensing unit of the pressure sensor 2300 is controlled by the first processor 3500 is detected according to a predetermined time sequence can be effectively avoided, the control stability can be improved, and the reliability can be increased, and the volume of the pressure pulse wave sensor can be reduced.

Example eleven:

the present embodiment provides a pressure pulse wave sensor in which an atmospheric pressure sensor and a temperature sensor are added to any of the above embodiments, and an example in which an atmospheric pressure sensor and a temperature sensor are added to the tenth embodiment is described.

Referring to fig. 11, in the present embodiment, the pressure pulse wave sensor further includes an atmospheric pressure sensor 4390 and a temperature sensor 3900, and the atmospheric pressure sensor 4390 and the temperature sensor 3900 are respectively connected to the first processor 3500.

The atmospheric pressure sensor 4390 is used for measuring the ambient atmospheric pressure to obtain an atmospheric pressure value, and the atmospheric pressure sensor 4390 is further used for transmitting the atmospheric pressure value to the first processor 3500, and the first processor 3500 may process the atmospheric pressure value or directly transmit the atmospheric pressure value to an external device through the signal interface 3200 (or the output connection terminal 2500). In particular, when the pressure sensor 2300 is an absolute pressure sensor, the pressure value of the relative pressure can be calculated from the measurement value of the atmospheric pressure sensor 4390 and the measurement value of the absolute pressure sensor 2300.

The temperature sensor 3900 is used to measure the temperature inside the pressure pulse wave sensor, particularly the temperature of the pressure sensor 2300. Temperature sensor 3900 may be disposed proximate to pressure sensor 2300 such that temperature sensor 3900 is able to more accurately measure the temperature of pressure sensor 2300. The temperature sensor 3900 measures the temperature of the pressure sensor 2300 and transmits the temperature value to the first processor 3500, and the first processor 3500 may transmit directly to an external device through the signal interface 3200 (or the output connection terminal 2500). The first processor 3500 may also control the pressure pulse wave sensor according to a temperature value, for example, when the temperature value is too high or too low, the detection of the pressure pulse wave sensor is turned off, so as to protect the pressure pulse wave sensor and ensure the pressure measurement accuracy.

In this embodiment, the atmospheric pressure sensor 4390 and the temperature sensor 3900 are added to monitor the atmospheric pressure and the temperature, so that safety protection can be realized based on the detection of the atmospheric pressure and the temperature, and the service life of the pressure pulse wave sensor is prolonged. Moreover, the measurement of temperature sensor 3900 may also be used for temperature compensation of the pressure sensor.

In other embodiments, only one of the atmospheric pressure sensor 4390 and the temperature sensor 3900 may be added, so that a certain safety protection function can be also achieved.

Embodiment twelve:

the present embodiment provides a pressure pulse wave sensor, in which a start-stop switch is added on the basis of any one of the above embodiments, and an example of adding a start-stop switch on the basis of the eleventh embodiment is described.

Referring to fig. 12, in the present embodiment, the pressure pulse wave sensor further includes a start-stop switch 4001, the start-stop switch 4001 is connected to the first processor 3500, and the start-stop switch 4001 is used for controlling the start and stop of the pressure pulse wave sensor.

The start-stop switch 4001 can be a physical key, and a user can manually and directly operate the start and the stop of the pressure pulse wave sensor, so that the operation and the use of the user are facilitated.

In other embodiments, a start-stop switch 4001 may also be provided between the power input device 2100 and other components for controlling the start and stop of the power supply to the pressure pulse wave sensor.

The present utility model has been described above using specific examples, which are only useful for aiding in the understanding of the present utility model, and are not intended to limit the other applications of the present utility model. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.

Claims

1. A pressure pulse wave sensor for detecting a pressure pulse wave signal of an artery, comprising: the power supply input device, the control connection terminal, the pressure sensor, the analog switch and the output connection terminal;

The analog switch is provided with a control end;

the control connection terminal is connected with the control end of the analog switch, controls the on-off of the analog switch through the control end, and controls the pressure sensing unit to detect the first pressure signal;

2. The pressure pulse wave sensor of claim 1, wherein:

the analog switch comprises a first analog switch, a second analog switch, a third analog switch and a fourth analog switch;

3. The pressure pulse wave sensor of claim 1, wherein:

the control connection terminal is connected with the control end of the analog switch through the decoder; the decoder receives the control signal from the control connection terminal, decodes the control signal and outputs a decoded signal, and the control connection terminal controls the pressure sensing unit to detect the first pressure signal through the decoder.

4. A pressure pulse wave sensor according to claim 3, wherein the analog switch and the decoder are integrated as an analog multiplexer.

5. The pressure pulse wave sensor of claim 1, wherein:

the constant current driving circuit comprises a sampling resistor; the constant current driving circuit is connected with the power input device and the Wheatstone bridge;

6. The pressure pulse wave sensor of claim 1, further comprising an analog preprocessing unit; the analog preprocessing unit is connected with the output connecting terminal; the second node is directly or indirectly connected with the analog preprocessing unit, and the fourth node is directly or indirectly connected with the analog preprocessing unit; the analog preprocessing unit is used for acquiring the first pressure signal from the pressure sensor, amplifying the first pressure signal to obtain a second pressure signal, and the output connecting terminal is used for outputting the second pressure signal.

7. The pressure pulse wave sensor of claim 6, further comprising a digital preprocessing unit; the digital preprocessing unit is arranged between the analog preprocessing unit and the output connection terminal; the digital preprocessing unit is used for acquiring the second pressure signal from the analog preprocessing unit and converting the second pressure signal into a first pressure digital signal; the output connection terminal is used for outputting the first pressure digital signal.

8. The pressure pulse wave sensor of any one of claims 1 to 7, wherein the power input device further comprises the power management device, the power management device being connected to the power input, the power output and the power ground for managing externally input power.

9. The pressure pulse wave sensor of any one of claims 1 to 7, wherein the pressure sensing unit is an absolute pressure sensing unit.

10. The pressure pulse wave sensor according to any one of claims 1 to 7, wherein:

the device also comprises an atmospheric pressure sensor, wherein the atmospheric pressure sensor is connected with the output connection terminal and is used for measuring the ambient atmospheric pressure;

11. A pressure pulse wave sensor for detecting a pressure pulse wave signal of an artery, comprising: the power supply input device, the pressure sensor, the analog switch, the first processor and the signal interface;

The analog switch is provided with a control end;

the first processor further comprises an analog preprocessing unit, a digital preprocessing unit and a calculation processing unit which are sequentially connected; the analog preprocessing unit receives the third pressure signal from the selected pressure sensing unit, amplifies the third pressure signal to obtain a fourth pressure signal, and the digital preprocessing unit converts the fourth pressure signal into a second pressure digital signal; the processing unit calculates a blood pressure value according to the second pressure digital signal;

12. The pressure pulse wave sensor of claim 11, wherein:

13. The pressure pulse wave sensor of claim 11, wherein the analog switch and the first processor are integrally integrated as a second processor;

14. The pressure pulse wave sensor of claim 11, wherein:

the first processor is connected with the control end of the analog switch through the decoder; the decoder receives the control signal from the first processor, decodes the control signal and outputs a decoded signal, and the first processor controls the pressure sensing unit to detect the third pressure signal through the decoder.

15. The pressure pulse wave sensor of claim 14, wherein:

the analog switch and the decoder are integrated into an analog multiplexer;

16. The pressure pulse wave sensor of claim 14, wherein:

17. The pressure pulse wave sensor of claim 16, wherein:

the constant current drive circuit, the analog switch, the decoder and the first processor are integrated into a fourth processor;

And/or the pressure sensor, the constant current driving circuit, the analog switch, the decoder and the first processor are integrated into a third integrated pressure pulse wave sensor.

18. The pressure pulse wave sensor of claim 16, wherein the signal interface comprises a wireless communication device; the wireless communication device is coupled to the first processor.

19. The pressure pulse wave sensor of claim 18, wherein:

the wireless communication device, the constant current driving circuit, the analog switch, the decoder and the first processor are integrated into a fifth processor;

and/or the pressure sensor, the wireless communication device, the constant current driving circuit, the analog switch, the decoder and the first processor are integrated into a fourth integrated pressure pulse wave sensor.

20. The pressure pulse wave sensor of claim 18, wherein the power input device further comprises the power management device, the power management device being coupled to the power input, the power output, and the power ground for managing externally input power.

21. The pressure pulse wave sensor of claim 20, wherein:

the power management device, the wireless communication device, the constant current driving circuit, the analog switch, the decoder and the first processor are integrated into a sixth processor;

and/or the pressure sensor, the power management device, the wireless communication device, the constant current driving circuit, the analog switch, the decoder and the first processor are integrated into a fifth integrated pressure pulse wave sensor.

22. The pressure pulse wave sensor of any one of claims 11 to 21, wherein the pressure sensing unit is an absolute pressure sensing unit.

23. The pressure pulse wave sensor according to any one of claims 11 to 21, wherein:

the atmospheric pressure sensor is connected with the first processor and is used for measuring the ambient atmospheric pressure;

and/or, further comprising a temperature sensor connected to the first processor, the temperature sensor being disposed proximate to the pressure sensor, the temperature sensor being configured to measure a temperature of the pressure sensor;