CN205126206U - Body temperature measuring device - Google Patents

Abstract

The utility model discloses a body temperature measuring device, which comprises a detection circuit, a housing, a first temperature sensor, a second temperature sensor and a temperature measuring contact part. The detection circuit is arranged in the housing, and the surface of the housing is provided with A raised temperature-measuring contact part, the first temperature sensor is arranged on the top of the temperature-measuring contact part, the second temperature sensor is arranged at the base of the temperature-measuring contact part, the first temperature sensor, the second temperature sensor The two temperature sensors are respectively connected to the detection circuit. The utility model is provided with two temperature sensors, and utilizes the temperature difference of the two temperature sensors to measure whether the thermometer has reached thermal balance, so as to output accurate body temperature values as soon as possible.

Description

body temperature measuring device

technical field

The utility model relates to a body temperature measuring device capable of measuring body temperature reliably and quickly, which belongs to the technical field of body temperature measuring instruments.

Background technique

Body temperature has always been an important indicator of medical diagnosis, so in the field of medical devices, there are a large number of body temperature measurement equipment products. The performance of traditional mercury thermometers is relatively reliable, but the measurement time required is very long. Patients usually need to take measurements for more than five minutes before they can measure the accurate body temperature value in the body, and the temperature needs to be enlarged through the glass thermometer body to be accurately read. out, poor usability. Recently popular electronic thermometers usually use a bridge circuit composed of thermistors to indirectly measure the patient's body temperature through the potential difference caused by the change in the resistance of the thermistor after heating. Compared with traditional mercury thermometers, its convenience and ease of use have been greatly improved. However, it still takes a long time for the electronic thermometer to enter the temperature measurement part of the human body to establish thermal equilibrium with the temperature measurement part. In order to avoid inaccurate results when the electronic thermometer is not yet the same as the human body temperature, the existing electronic thermometer usually sets a timer independently, and buzzes to remind the patient that the thermometer has reached the temperature after a few seconds after the temperature data starts to increase. With sufficient heat exchange with the human body, the current body temperature value is already an accurate body temperature value. However, this kind of electronic thermometer adopts a fixed temperature measurement time, and cannot prompt the patient to read the body temperature at the first time when the thermometer measures an accurate body temperature value, which is still not simple and fast enough.

Although the existing infrared thermometers are relatively convenient and have a fast measurement speed, they are greatly affected by the ambient temperature and are easily interfered by infrared rays from other sources outside, resulting in inaccurate temperature measurement results.

Contents of the invention

Purpose of the invention: The purpose of this utility model is to provide a body temperature measuring device that can read accurate body temperature values faster.

Technical solution: The body temperature measuring device of the present invention includes a detection circuit, a housing, a first temperature sensor, a second temperature sensor, a temperature measuring contact part and a signal comparison device, the detection circuit is arranged in the housing, and the The surface is provided with a raised temperature-measuring contact part, the first temperature sensor is arranged on the top of the temperature-measuring contact part, the second temperature sensor is arranged at the base of the temperature-measuring contact part, and the first The temperature sensor and the second temperature sensor are respectively connected to the detection circuit, and the detection circuit is provided with a signal comparison device for comparing the output signal of the first temperature sensor with the output signal of the second temperature sensor.

Further, the temperature measuring contact part is a temperature measuring contact part made of polyurethane foam. Utilize the flexibility of polyurethane foam to block the gap in the temperature measurement place (such as the ear canal) to avoid air convection at the temperature measurement place, so that most of the heat from the human body can be conducted to the sensor.

Further, the shape of the temperature measuring contact part and the body temperature collecting part are matched with each other. Further reduce gaps to avoid air convection.

Further, the body temperature collection site is the ear canal, oral cavity or rectum.

Further, the detection circuit includes a power supply, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and an operational amplifier IC1, the output signal comparison device is a light-emitting diode D1, and the first temperature sensor is a thermistor Rt1. The second temperature sensor is a thermistor Rt2, the series resistor R1 and thermistor Rt1, the series resistor R2 and thermistor Rt2, the series resistor R3 and the resistor R4 are connected in parallel and then connected to the two terminals of the power supply. One input terminal of the two input terminals of the operational amplifier IC1 is connected between the series resistor R1 and the thermistor Rt1, the other input terminal is connected between the series resistor R3 and the resistor R4, and one terminal of the light emitting diode D1 It is connected between the series resistance R1 and the thermistor Rt1, and the other end is connected between the series resistance R2 and the thermistor Rt2. In this way, the analog voltage value output by the output terminal of the operational amplifier represents the body temperature measured at this time, and can be output as an analog signal.

Further, it also includes a single-chip microcomputer and a digital display module U1, the single-chip microcomputer receives the signal from the operational amplifier IC1, and the single-chip microcomputer transmits the digital display signal corresponding to the temperature value of the signal from the operational amplifier IC1 to the digital display module U1. The single-chip microcomputer stores the corresponding data correspondence table between the analog signal value and the temperature value after one calibration, and obtains the corresponding digital display value by looking up the analog signal input value, and converts it into a digital display signal and displays it on the digital display module U1.

Compared with the prior art, the utility model has the beneficial effects that: the utility model sets two temperature sensors, and uses the temperature difference of the two temperature sensors to measure whether the thermometer has reached thermal balance, so as to output accurate body temperature values as soon as possible.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the body temperature measuring device described in the utility model;

Fig. 2 is a schematic cross-sectional view of the temperature acquisition device described in the present invention;

FIG. 3 is a schematic diagram of the circuit structure of the temperature acquisition device described in the present invention.

detailed description

The technical solutions of the utility model are described in detail below, but the protection scope of the utility model is not limited to the embodiments.

Example 1:

As shown in Figure 1, it is a schematic diagram of the three-dimensional structure of the body temperature measuring device of this embodiment. On the upper surface of the housing 2, an upwardly protruding temperature-measuring contact part 5 is provided, and the temperature-measuring contact part is made of flexible polyurethane foam. , the lower surface is connected with the housing, and a channel is opened in the center thereof, for the first temperature sensor 3 arranged on the top of the temperature measuring contact part 5 to lead the wire into the detection circuit 1 in the housing, at the base of the temperature measuring contact part 5 A second temperature sensor 4 is also provided, and the leads of the second temperature sensor 4 are also introduced into the detection circuit 1 through the casing. So set, when in use, the temperature measurement contact part 5 is in contact with the temperature measurement site of the subject, such as the skin surface, ear canal or oral cavity, anus, because the first temperature sensor 3 is deeper, so it will be faster and The subject generates thermal balance to reach the body temperature value, and the second temperature sensor will also balance the heat of the subject to reach the body temperature of the subject. Therefore, the first temperature sensor 3 heats up faster, and then heats up to body temperature, and the second temperature sensor 4 heats up relatively slowly, but also heats up to body temperature. The temperature difference between the first temperature sensor and the second temperature sensor changes from large to small until the temperature difference drops to almost zero. At this time, it can be determined that both the first temperature sensor and the second temperature sensor have reached thermal equilibrium with the body temperature of the subject. , an accurate body temperature is measured, and the temperature value measured by the first temperature sensor at this time is the accurate body temperature value.

As shown in Figure 2, the detection circuit 1 is set in the housing 2, on which a 89C205 single-chip microcomputer with an analog input terminal is set.

Fig. 3 is the circuit schematic diagram of the detection circuit 1 and the 89C205 single-chip microcomputer. As shown in the figure, the first sensor 3 is the thermistor Rt1, the second temperature sensor 4 is the thermistor Rt2, and the thermistor Rt1 and the resistor R1 is connected in series, thermistor Rt2 is connected in series with resistor R2, resistor R3 is connected in series with R4, and the three series branches are connected in parallel and then connected to the power supply V1, and then the operational amplifier IC1 is used as an amplifier (the auxiliary circuit and power supply circuit around IC1 are not shown in Figure 3 As shown, it can be set by using an ordinary amplifier circuit.), the two input terminals are respectively connected to the node between R3 and R4, and the node between R1 and Rt1, through the bridge circuit formed in this way, the voltage difference between the two input terminals of the amplifier is used to indirectly Measure the temperature at the thermistor Rt1. The resistance values of R1, R2, R3, and R4 are all 1000 ohms, and the thermistors Rt1 and Rt2 are the same type of thermistors, and their resistance values are also 1000 ohms at room temperature. Similarly, a bridge circuit is also formed between R2 and Rt2 connected in series, R1 and Rt1 connected in series and diode D1, and whether the resistance values of Rt1 and Rt2 are the same through the lighting of diode D1, that is, the temperature at Rt1 and Rt2 Is it the same. When the diode goes out, it means that the accurate body temperature value has been read at this time. The analog input terminal of the single-chip microcomputer 6 is connected with the output terminal of the amplifier formed by IC1, and the voltage value output by the amplifier placed in the system at different temperatures is calibrated, and the output value obtained by calibration and the temperature at the thermistor are stored in a table In the single-chip microcomputer 6, the temperature value corresponding to the real-time output value is obtained through a table look-up method, and converted into a digital display signal and sent to the digital display module U1.

As stated above, although the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. a body temperature measuring device, comprise testing circuit (1), housing (2), first temperature sensor (3), second temperature sensor (4), thermometric contact site (5) and signal comparison means, described testing circuit (1) is arranged in housing (2), the surface of described housing (2) is provided with protruding thermometric contact site (5), described first temperature sensor (3) is arranged at the top of described thermometric contact site (5), described second temperature sensor (4) is arranged at the base portion of described thermometric contact site (5), described first temperature sensor (3), second temperature sensor (4) is connected to testing circuit respectively, described testing circuit is provided with the signal comparison means comparing the first temperature sensor (3) output signal and output signal with the second temperature sensor (4).

2. body temperature measuring device according to claim 1, is characterized in that, described thermometric contact site (5) is polyurethane foam thermometric contact site (5).

3. body temperature measuring device according to claim 1 and 2, is characterized in that, the shape that described thermometric contact site (5) and body temperature gather position cooperatively interacts.

4. body temperature measuring device according to claim 3, is characterized in that, it is auditory meatus, oral cavity or rectum that described body temperature gathers position.

5. body temperature measuring device according to claim 1 and 2, it is characterized in that, described testing circuit comprises power supply, resistance R1, resistance R2, resistance R3, resistance R4, operational amplifier IC1, it is light emitting diode D1 that described output signal compares device, described first temperature sensor is critesistor Rt1, described second temperature sensor is critesistor Rt2, the resistance R1 of described series connection and critesistor Rt1, the resistance R2 of series connection and critesistor Rt2, the resistance R3 of series connection and resistance R4 is together connected to the two ends of described power supply after parallel connection, described operational amplifier IC1 two input one input is connected between the resistance R1 of series connection and critesistor Rt1, another input is connected between the resistance R3 of series connection and resistance R4, one end of described light emitting diode D1 is connected between the resistance R1 of series connection and critesistor Rt1, the other end is connected between the resistance R2 of series connection and critesistor Rt2.

6. body temperature measuring device according to claim 5, characterized by further comprising single-chip microcomputer (6) and digital display module U1, described single-chip microcomputer receives the signal that operational amplifier IC1 sends, and is sent to described digital display module U1 after the digital display signal of the signal corresponding temperature value that operational amplifier IC1 sends by described single-chip microcomputer.