Body temperature acquisition circuit and monitor

Abstract

A body temperature acquisition circuit and a monitor relate to the field of physiological data monitoring. The circuit includes; the system comprises a sensor, a mode adjusting module and an amplifying module, and the sensor is used for collecting the body temperature of a human body to determine a temperature signal; the mode adjusting module is used for acquiring the on or off signal and adjusting the feedback signal according to the on or off signal; the amplification module obtains the temperature signal and the feedback signal, amplifies the temperature signal, and determines an output body temperature value, a zero calibration value or a median calibration value according to the feedback signal.

Description

TECHNICAL FIELD

[0001] The utility model relates to physiological data monitoring field, concretely relates to a body temperature acquisition circuit and monitor. BACKGROUND

[0002] Body temperature is one of the five life characteristics, and body temperature acquisition can monitor real-time body temperature and daily average body temperature of patients, and plays a more and more important role in diagnosis and subsequent treatment of patients. For inpatients, ICU patients, anesthesia operation patients and operation period patients, the collection and record of body temperature are very important. When the body temperature of patients changes beyond the normal range, the medical staff can take corresponding measures as early as possible. Therefore, it is particularly important to use a body temperature probe to collect body temperature and continuously collect patients during anesthesia operation.

[0003] The body temperature measurement in the monitor generally uses a negative temperature coefficient thermistor as a temperature sensor, utilizes the physical property that the resistivity of the thermistor changes with the change of external temperature, connects the body temperature probe to the monitor with a body temperature acquisition module, converts the impedance change of the thermistor into an electrical signal output to the monitor for acquisition and calculation, and obtains the corresponding body temperature value.

[0004] However, in actual work, some advanced hospitals and departments need to collect body temperature to higher accuracy and accuracy, the temperature measurement range is 0~100 DEG C, the accuracy is 25~45 DEG C ± 0.01 DEG C, and safe and reliable design is needed to ensure the correctness of the body temperature reading. Moreover, the output signal of the thermistor needs to be properly processed and compensated to obtain accurate temperature acquisition. UTILITY MODEL CONTENTS

[0005] The utility model mainly solves the technical problem that a body temperature acquisition circuit and the corresponding monitor can switch between the measurement state, the zero point calibration state and the median calibration state through the switch control signal, so that different feedback signals are obtained, and the temperature signal is compensated and corrected in combination with the amplification module.

[0006] According to the first aspect, a body temperature acquisition circuit is provided in an embodiment, which comprises:

[0007] A sensor is used to collect the body temperature of a human body to determine a temperature signal.

[0008] A mode adjustment module is used to obtain a conduction or shutdown signal, and adjust a feedback signal according to the conduction or shutdown signal.

[0009] An amplification module obtains the temperature signal and the feedback signal, amplifies the temperature signal, and determines an output body temperature value, a zero point calibration value or a median calibration value according to the feedback signal.

[0010] In one embodiment, the mode adjustment module comprises a measurement module, a zero-point calibration module, and a median calibration module;

[0011] The measurement module comprises a measurement switch, and a feedback signal of the measurement module is adjusted according to the measurement switch;

[0012] The zero-point calibration module comprises a zero-point switch, and a feedback signal of the zero-point calibration module is adjusted according to the zero-point switch;

[0013] The median calibration module comprises a median switch, and a feedback signal of the median calibration module is adjusted according to the median switch.

[0014] In one embodiment, the measurement module comprises a resistor R101, a resistor R102, a capacitor C101, a capacitor C102, and a switch tube Q1;

[0015] A first end of the resistor R101 is used to connect a first output end of a sensor, and a second end of the resistor R101 is used to connect a working power supply; the switch tube Q102 is used as the measurement switch, a first end of the switch tube Q102 is used to connect a second output end of the sensor, a control end of the switch tube is used to obtain a conduction or shutdown signal, and a second end of the switch tube is connected to a first end of the resistor R102, a second end of the resistor R102 is grounded; a first end of the capacitor C101 is connected to the second output end of the sensor, a second end of the capacitor C101 is connected to a first end of the capacitor C102, and a second end of the capacitor C102 is grounded; and the first end of the capacitor C102 is also connected to the first end of the resistor R102.

[0016] In one embodiment, the zero-point calibration module comprises a switch tube Q101, and the switch tube Q101 is used as the zero-point switch; a first end of the switch tube Q101 is connected to a first output end of a sensor, a control end of the switch tube Q101 is used to obtain a conduction or shutdown signal, and a second end of the switch tube Q101 is connected to a second end of the capacitor C101.

[0017] In one embodiment, the median calibration module further comprises a resistor R103 and a switch tube Q103, the switch tube Q103 is used as the median switch, a first end of the resistor R103 is connected to a first output end of a sensor, a second end of the resistor R103 is connected to a first end of the switch tube Q103, a control end of the switch tube Q103 is used to obtain a conduction or shutdown signal, and a second end of the switch tube Q103 is connected to a second end of the switch tube Q101.

[0018] In one embodiment, the switch tube Q102 obtains a turn-on signal, the switch tube Q101 obtains a turn-off signal, the switch tube Q103 obtains a turn-off signal, and the amplification module determines an output body temperature value according to a feedback signal; the switch tube Q102 obtains a turn-off signal, the switch tube Q101 obtains a turn-on signal, the switch tube Q103 obtains a turn-off signal, and the amplification module determines an output zero-point calibration value according to a feedback signal; the switch tube Q102 obtains a turn-off signal, the switch tube Q101 obtains a turn-off signal, the switch tube Q103 obtains a turn-on signal, and the amplification module determines an output median calibration value according to a feedback signal.

[0019] In one embodiment, the amplification module comprises a resistor R104, a resistor R105, a capacitor C103, and an amplifier U101.

[0020] The non-inverting input terminal of the amplifier U101 is connected to the first output terminal of the sensor, the non-inverting input terminal of the amplifier U101 is connected to the first terminal of the capacitor C103, and the second terminal of the capacitor C103 is grounded; the inverting input terminal of the amplifier U101 is connected to the first terminal of the resistor R104, and the second terminal of the resistor R104 is grounded; the inverting input terminal of the amplifier U101 is also connected to the first terminal of the resistor R105, the second terminal of the resistor R105 is connected to the output terminal of the amplifier U101, and the output terminal of the amplifier U101 is used to output a body temperature value, a zero-point calibration value, or a median calibration value.

[0021] In one embodiment, the body temperature acquisition circuit further comprises a filtering module for filtering the body temperature value, the zero-point calibration value, or the median calibration value.

[0022] In one embodiment, the filtering module comprises a resistor R106, a capacitor C104, a diode D101, and a diode D102.

[0023] The first terminal of the resistor R106 is connected to the amplification module, the second terminal of the resistor R106 is connected to the first terminal of the capacitor C104, and the second terminal of the capacitor C104 is grounded; the second terminal of the resistor R106 is also connected to the input terminal of the diode D101, the output terminal of the diode D101 is connected to a working power supply; the second terminal of the resistor R106 is also connected to the output terminal of the diode D102, and the input terminal of the diode D102 is grounded; and the second terminal of the resistor R106 is used to output a filtered body temperature value, a filtered zero-point calibration value, or a filtered median calibration value.

[0024] According to the second aspect, in one embodiment, a monitor is provided, which adopts the body temperature acquisition circuit in any one of the above embodiments.

[0025] The temperature acquisition circuit and the monitor according to the above-mentioned embodiments comprise a sensor, a mode adjustment module and an amplification module in the temperature acquisition circuit, the mode adjustment module is used to obtain a conduction or shutdown signal, so as to obtain different feedback signals, and the amplification module is used to process the temperature signal according to the feedback signals, so as to obtain a body temperature value, a zero-point calibration value or a median calibration value. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a temperature acquisition circuit according to an embodiment;

[0027] Figure 2 FIG. 2 is a circuit diagram of the temperature acquisition circuit according to the embodiment;

[0028] Figure 3 FIG. 3 is a structural schematic diagram of a monitor according to another embodiment. DETAILED DESCRIPTION

[0029] The utility model will be further described in detail through specific implementation manners and the drawings. In different implementation manners, similar elements are marked with similar element numbers. In the following implementation manners, many details are described in order to make the present application be better understood. However, the person skilled in the art can easily realize that part of the features can be omitted in different cases, or can be replaced by other elements, materials or methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid the core part of the present application being overwhelmed by too much description, and the person skilled in the art can completely understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0030] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that is obvious to the person skilled in the art. Therefore, the order in the specification and the drawings is only for the purpose of clearly describing a certain embodiment, and does not mean that it is the necessary order, unless otherwise stated that a certain order must be followed.

[0031] In this paper, the serial numbers of components, such as "first", "second", etc., are only used to distinguish the described objects, and have no order or technical meaning. Unless otherwise specified, "connection" and "coupling" in this application include direct and indirect connection (coupling).

[0032] Please refer to Figure 1The application provides a body temperature acquisition circuit 110, which comprises a sensor 111, a mode adjustment module 112, an amplification module 113 and a filtering module 114.

[0033] In an embodiment, the sensor 111 is a temperature sensor, which is used for acquiring the body temperature of a human body, so as to determine a temperature signal of the body temperature of the human body.

[0034] In an embodiment, the mode adjustment module 112 comprises a measurement module 112a, a zero-point calibration module 112b and a median calibration module 112c, and the measurement module 112a, the zero-point calibration module 112b and the median calibration module 112c comprise corresponding measurement switches, zero-point switches and median switches, each switch obtains a corresponding on or off signal, so as to generate different feedback signals to the amplification module 113.

[0035] Please refer to Figure 2 In an embodiment, the measurement module 112a comprises a resistor R101, a resistor R102, a capacitor C101, a capacitor C102 and a switch tube Q102. The first end of the resistor R101 is used for connecting the first output end of the sensor 111, and the second end of the resistor R101 is connected with a working power supply VCC. The switch tube Q102 is used as a measurement switch, the first end of the switch tube Q102 is used for connecting the second output end of the sensor 111, the control end of the switch tube is used for obtaining an on or off signal, and the second end of the switch tube is connected with the first end of the resistor R102. The second end of the resistor R102 is grounded VSS. The first end of the capacitor C101 is connected with the second output end of the sensor 111, the second end of the capacitor C101 is connected with the first end of the capacitor C102, and the second end of the capacitor C102 is grounded VSS. The first end of the capacitor C102 is also connected with the first end of the resistor R102.

[0036] In an embodiment, the zero-point calibration module 112b comprises a switch tube Q101, and the switch tube Q101 is used as a zero-point switch. The first end of the switch tube Q101 is connected with the first output end of the sensor 111, the control end of the switch tube Q101 is used for obtaining an on or off signal, and the second end of the switch tube Q101 is connected with the second end of the capacitor C101.

[0037] In an embodiment, the median calibration module 112c further comprises a resistor R103 and a switch tube Q103, and the switch tube Q103 is used as a median switch. The first end of the resistor R103 is connected with the first output end of the sensor 111, the second end of the resistor R103 is connected with the first end of the switch tube Q103, the control end of the switch tube Q103 is used for obtaining an on or off signal, and the second end of the switch tube Q103 is connected with the second end of the switch tube Q101.

[0038] In one embodiment, when the normal output temperature value is needed, the switch tube Q102 obtains a conducting signal, the switch tube Q101 obtains a turn-off signal, and the switch tube Q103 obtains a turn-off signal. At this time, the working power supply VCC, the resistor R101, the sensor 111, the resistor R102, and the ground VSS form a path, and the amplification module 113 obtains the feedback signal of the path to determine the temperature value.

[0039] In one embodiment, when the zero-point calibration value of the temperature is needed, the switch tube Q102 obtains a turn-off signal, the switch tube Q101 obtains a conducting signal, and the switch tube Q103 obtains a turn-off signal. At this time, the working power supply VCC, the resistor R101, the resistor R102, and the ground VSS are turned on, and the amplification module 113 obtains the zero-point value of the path as the feedback signal to determine the zero-point calibration value.

[0040] In one embodiment, when the median calibration value of the temperature is needed, the switch tube Q102 obtains a turn-off signal, the switch tube Q101 obtains a turn-off signal, and the switch tube Q103 obtains a conducting signal. At this time, the working power supply VCC, the resistor R101, the resistor R103, the resistor R102, and the ground VSS are turned on, and the amplification module 113 obtains the median value of the path as the feedback signal to determine the median calibration value.

[0041] It should be noted that the resistor R101, the resistor R102, and the resistor R103 are high-precision, low-temperature-drift resistors, and the influence of the environment on the resistance values of the resistors can be ignored. The resistance value of the resistor R101 is close to the value of the sensor 111 at normal temperature, the resistance value of the resistor R102 is small, and is only 1% of the resistance value of the resistor R101. The resistance value of the resistor R103 can be selected according to actual conditions, and a value close to the measurement accuracy of the sensor 111 is usually selected to calibrate the temperature. In addition, the hardware parameters of the switch tube Q102, the switch tube Q101, and the switch tube Q103 are the same. In the mode adjustment module 112, the conducting or turn-off signal obtained by the switch tube Q102, the switch tube Q101, and the switch tube Q103 is the high level or low level input by the corresponding MCU. When the corresponding MCU inputs the high level, the corresponding switch tube is turned on; and when the corresponding MCU inputs the low level, the corresponding switch tube is turned off. In this application, MOS tubes are used as the switch tube Q102, the switch tube Q101, and the switch tube Q103, and other switch devices that can be controlled by a controller can also be used in actual applications.

[0042] In one embodiment, the amplification module 113 obtains the temperature signal, and outputs the corresponding temperature value, zero-point calibration value, or median calibration value according to the different feedback signals output by the mode adjustment module 112.

[0043] In one embodiment, the amplification module 113 comprises a resistor R104, a resistor R105, a capacitor C103 and an amplifier U101. The non-inverting input terminal of the amplifier U101 is connected to the first output terminal of the sensor 111, the inverting input terminal of the amplifier U101 is connected to the first terminal of the capacitor C103, and the second terminal of the capacitor C103 is grounded VSS. The inverting input terminal of the amplifier U101 is also connected to the first terminal of the resistor R104, and the second terminal of the resistor R104 is grounded VSS. The inverting input terminal of the amplifier U101 is also connected to the first terminal of the resistor R105, the second terminal of the resistor R105 is connected to the output terminal of the amplifier U101, and the output terminal of the amplifier U101 is used to output the body temperature value, the zero-point calibration value or the median calibration value.

[0044] In one embodiment, the filter module 114 is used to filter the body temperature value, the zero-point calibration value or the median calibration value, so as to obtain more accurate body temperature value, zero-point calibration value and median calibration value.

[0045] In one embodiment, the filter module 114 comprises a resistor R106, a capacitor C104, a diode D101 and a diode D102. The first terminal of the resistor R106 is connected to the amplification module 113, the second terminal of the resistor R106 is connected to the first terminal of the capacitor C104, and the second terminal of the capacitor C104 is grounded VSS. The second terminal of the resistor R106 is also connected to the input terminal of the diode D101, and the output terminal of the diode D101 is connected to the working power supply VCC. The second terminal of the resistor R106 is also connected to the output terminal of the diode D102, and the input terminal of the diode D102 is grounded VSS. The second terminal of the resistor R106 is used to output the filtered body temperature value, zero-point calibration value or median calibration value.

[0046] In one embodiment, in the body temperature acquisition circuit 110, the feedback signal of the non-inverting input terminal of the amplifier U101 is adjusted by changing the on-off of the switch tube Q102, the switch tube Q101 and the switch tube Q103, and the acquired temperature signal is processed differently according to the feedback signal, so as to obtain the body temperature value, the zero-point calibration value and the median calibration value. In addition to obtaining the body temperature value, the zero-point calibration value and the median calibration value, when the switch tube Q102 acquires the on signal, the switch tube Q101 acquires the off signal, and the switch tube Q103 acquires the on signal, the measurement range of the human body temperature can be changed; when the switch tube Q101 maintains the off signal and the on signal and the off signal acquired by the switch tube Q102 and the switch tube Q103 are switched, it can be confirmed whether the sensor 111 is off; when the switch tube Q102 maintains the off signal and the on signal and the off signal acquired by the switch tube Q101 and the switch tube Q103 are switched, it can be confirmed whether the sensor 111 is short-circuited.

[0047] Please refer to Figure 3In another embodiment, a monitor 100 is provided, comprising a body temperature acquisition circuit 110, wherein the body temperature acquisition circuit 110 comprises a sensor 111, a mode adjustment module 112, an amplification module 113 and a filtering module 114, as shown in Fig. Figure 2

[0048] In one embodiment, the sensor 111 is a temperature sensor, which is used to acquire the body temperature of a human body, so as to determine a temperature signal of the body temperature of the human body. The mode adjustment module 112 comprises a measurement module 112a, a zero-point calibration module 112b and a median calibration module 112c, which comprise corresponding measurement switches, zero-point switches and median switches, respectively. Each switch obtains a corresponding on or off signal, so as to generate different feedback signals to the amplification module 113. The amplification module 113 obtains the temperature signal, and outputs a corresponding body temperature value, zero-point calibration value or median calibration value according to the different feedback signals output by the mode adjustment module 112. The filtering module 114 is used to filter the body temperature value, zero-point calibration value or median calibration value, so as to obtain more accurate body temperature value, zero-point calibration value and median calibration value. Since the specific circuit structures of the sensor 111, the mode adjustment module 112, the amplification module 113 and the filtering module 114 have been clearly described in the embodiment of the body temperature acquisition circuit 110, they will not be described here.

[0049] Through the body temperature acquisition circuit 110 provided in the present application, the sensor 111 input signal acquired by the monitor 100 can be effectively processed and compensated, accurate temperature acquisition values are obtained, the output signal of the heat-sensitive resistor in the sensor 111 can be correctly processed and interpreted, and the accuracy and accuracy of the body temperature acquisition of the monitor 100 can be well improved.

[0050] The above application of specific examples to the utility model is described, which is only used to help understand the utility model, and does not limit the utility model. For the skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.​

Claims

1. A body temperature acquisition circuit, characterized by, include: Sensors are used to collect human body temperature in order to determine the temperature signal; The mode adjustment module is used to acquire the on or off signal and adjust the feedback signal according to the on or off signal; The mode adjustment module includes a measurement module, a zero-point calibration module, and a median calibration module; The measurement module includes a measurement switch, and the feedback signal of the measurement module is adjusted according to the measurement switch. The measurement module includes resistors R101 and R102, capacitors C101 and C102, and a switching transistor Q102. The first end of resistor R101 is used to connect to the first output terminal of the sensor, and the second end of resistor R101 is used to connect to the operating power supply. The switching transistor Q102 serves as the measurement switch. The first end of the switching transistor Q102 is used to connect to the second output terminal of the sensor, and the control terminal of the switching transistor is used to acquire a conduction or turn-off signal. The second end of the switching transistor is connected to the first end of resistor R102, and the second end of resistor R102 is grounded. The first end of capacitor C101 is connected to the second output terminal of the sensor, and the second end of capacitor C101 is connected to the first end of capacitor C102, and the second end of capacitor C102 is grounded. The first end of capacitor C102 is also connected to the first end of resistor R102. The zero-point calibration module includes a zero-point switch, and the feedback signal of the zero-point calibration module is adjusted according to the zero-point switch; the zero-point calibration module includes a switching transistor Q101, which is the zero-point switch, the first end of the switching transistor Q101 is connected to the first output end of the sensor, the control end of the switching transistor Q101 is used to acquire a conduction or cutoff signal, and the second end of the switching transistor Q101 is connected to the second end of the capacitor C101; The median calibration module includes a median switch, and the feedback signal of the median calibration module is adjusted according to the median switch. The median calibration module also includes a resistor R103 and a switch Q103. The switch Q103 is the median switch. The first end of the resistor R103 is connected to the first output end of the sensor, and the second end of the resistor R103 is connected to the first end of the switch Q103. The control end of the switch Q103 is used to acquire a conduction or cutoff signal, and the second end of the switch Q103 is connected to the second end of the switch Q101. An amplification module acquires the temperature signal and the feedback signal, amplifies the temperature signal, and determines the output body temperature value, zero-point calibration value, or median calibration value based on the feedback signal. The switch tube Q102 obtains a conducting signal, the switch tube Q101 obtains an off signal, the switch tube Q103 obtains an off signal, and the amplification module determines an output body temperature value according to a feedback signal; the switch tube Q102 obtains an off signal, the switch tube Q101 obtains a conducting signal, the switch tube Q103 obtains an off signal, and the amplification module determines an output zero-point calibration value according to a feedback signal; the switch tube Q102 obtains an off signal, the switch tube Q101 obtains an off signal, the switch tube Q103 obtains a conducting signal, and the amplification module determines an output median calibration value according to a feedback signal.

2. The body temperature acquisition circuit according to claim 1, wherein The amplification module comprises a resistor R104, a resistor R105, a capacitor C103 and an amplifier U101. The non-inverting input end of the amplifier U101 is used for connecting a first output end of a sensor, the non-inverting input end of the amplifier U101 is connected with a first end of the capacitor C103, and a second end of the capacitor C103 is grounded; the inverting input end of the amplifier U101 is connected with a first end of the resistor R104, and a second end of the resistor R104 is grounded; the inverting input end of the amplifier U101 is also connected with a first end of the resistor R105, a second end of the resistor R105 is connected with an output end of the amplifier U101, and the output end of the amplifier U101 is used for outputting a body temperature value, a zero-point calibration value or a median calibration value.

3. The body temperature acquisition circuit according to claim 1, wherein The body temperature acquisition circuit further comprises a filtering module, which is used for filtering the body temperature value, the zero-point calibration value or the median calibration value.

4. The body temperature acquisition circuit according to claim 3, wherein The filtering module comprises a resistor R106, a capacitor C104, a diode D101 and a diode D102. A first end of the resistor R106 is used for connecting the amplification module, a second end of the resistor R106 is connected with a first end of the capacitor C104, and a second end of the capacitor C104 is grounded; the second end of the resistor R106 is also connected with an input end of the diode D101, an output end of the diode D101 is connected with a working power supply; the second end of the resistor R106 is also connected with an output end of the diode D102, an input end of the diode D102 is grounded; and the second end of the resistor R106 is used for outputting a filtered body temperature value, a filtered zero-point calibration value or a filtered median calibration value.

5. A monitor characterized by, The body temperature acquisition circuit is adopted. The body temperature acquisition circuit is adopted.

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