Automatic calibration device for mercury sphygmomanometer

Abstract

The utility model provides an automatic calibration device for a mercury sphygmomanometer, which comprises a standard pressure generating device, a standard pressure detecting device, a standard pressure detecting device, a standard pressure detecting device and an automatic calibration device, and is characterized in that the standard pressure generating device is used as a standard air source; the industrial camera is used for acquiring a sphygmomanometer image; the linear guide rail module is provided with an industrial camera and is used for driving the camera to move and keeping the visual angle of the camera always aligned with the convex liquid level of the mercury column during calibration; and the upper computer is used for setting the calibration device, processing calibration data and printing a calibration result. According to the sphygmomanometer calibration device, full-automatic calibration of the sphygmomanometer is achieved, manual intervention is not needed in the process, an experiment report can be output according to verification regulations after calibration is completed, labor cost is reduced, and calibration efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mercury sphygmomanometer reading recognition, and in particular relates to an automatic calibration device for mercury sphygmomanometers. Background Technology

[0002] With the continuous improvement of people's living standards and economic level, the medical and health industry has also developed vigorously. In particular, the demand for medical devices is growing day by day. As a daily health care product, blood pressure monitors are increasingly entering people's lives and have become a common item in every household.

[0003] Currently, most calibrations of mercury sphygmomanometers require manual calibration. A standard sphygmomanometer with a higher precision level is used to verify and calibrate the sphygmomanometer under test. The zero-point error, indication error, and sensitivity of the sphygmomanometer must be verified separately. According to JJG270-2008 "Verification Procedure for Sphygmomanometers and Blood Pressure Gauges", the sphygmomanometer should be placed under the verification environment for more than 2 hours before each verification. The complex verification procedure makes the manual workload large and tedious, and the use of visual observation also leads to human reading errors. Utility Model Content

[0004] To address the aforementioned problems, the main objective of this invention is to provide an automatic calibration device for mercury sphygmomanometers that offers high accuracy and broad applicability, enabling automatic calibration of mercury sphygmomanometers.

[0005] This utility model provides an automatic calibration device for a mercury sphygmomanometer, comprising:

[0006] A standard pressure generator serves as a standard gas source, providing the pressure required for calibration.

[0007] Industrial cameras are used to acquire images from blood pressure monitors;

[0008] The linear guide module is equipped with an industrial camera to drive the camera's movement and keep the camera's viewpoint aligned with the convex surface of the mercury column during calibration.

[0009] The host computer is used to configure the calibration device, process calibration data, and print calibration results.

[0010] This utility model has the following beneficial effects:

[0011] 1. This utility model satisfies the simultaneous calibration of different types of blood pressure monitors. Each air path is independent and controlled by a solenoid valve. Multiple air paths are also independent and controlled by a solenoid valve. If a problem occurs in the calibration of one air path, the calibration process of other air path blood pressure monitors will not be affected.

[0012] 2. This utility model uses a linear guide module to drive an industrial camera, keeping the shooting angle at the same level as the mercury column's scale line. It is also applicable to glass liquid measuring instruments such as thermometers and mercury sphygmomanometers, avoiding reading errors caused by the angle not being aligned with the liquid surface.

[0013] 3. This utility model designs a standard pressure generating device as a gas source for calibration experiments, providing the standard pressure required for sphygmomanometer calibration. It mainly consists of a microcontroller, a geared motor, and a piston-type micro-pressure pump. Through program control, it offers two output modes: a fixed pressure point and a pulse wave curve, which can be used to calibrate sphygmomanometers based on two different measurement principles: a stethoscope and an oscilloscope.

[0014] 4. This utility model provides an automatic calibration device for mercury sphygmomanometers, which can realize fully automatic calibration of sphygmomanometers without manual intervention. After calibration, it can output experimental reports according to the verification procedure, reducing labor costs and improving calibration efficiency. Attached Figure Description

[0015] To more clearly illustrate the reading recognition scheme and automatic calibration device in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below:

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the standard pressure generating device in an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the gas path design in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the experimental black box in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the bidirectional guide rail structure in an embodiment of this application.

[0021] Figure 6 This is an overall control block diagram of an automatic calibration device for a mercury sphygmomanometer according to an embodiment of this application. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Numerous specific details are set forth in the following description to provide a thorough understanding of the present utility model; the described embodiments are merely some, not all, of the embodiments of the present utility model. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present utility model.

[0023] like Figures 1-6 As shown in the figure, this application provides an automatic calibration device for a mercury sphygmomanometer, comprising:

[0024] 1) A standard pressure generator serves as a standard gas source, used to provide the pressure required for calibration;

[0025] 2) Industrial camera, used to acquire images from a blood pressure monitor;

[0026] 3) Linear guide rail module, used to move the camera up and down, and to keep the camera's viewing angle aligned with the convex surface of the mercury column during calibration;

[0027] 4) Host computer, used to configure the calibration device, process calibration data and print calibration results.

[0028] In component 1), the standard pressure generating device specifically includes: a micro-pressure pump, an STM32 microcontroller, a geared motor, and a digital pressure gauge, etc.

[0029] It serves as a standard gas source, providing the pressure required for calibration. During calibration, the host computer sets the calibration pressure, and a digital pressure gauge collects the reading of the standard pressure gauge in real time as the system's standard value. This value is compared with the set pressure value, and the frequency of pulses output by the STM32 microcontroller is controlled based on the difference between the two. This controls the rotation speed of the geared motor, which in turn drives the piston of the micro-pressure pump. When the set pressure point is reached, the motor speed drops to 0.

[0030] In component 1), the standard pressure generating device is connected to the blood pressure monitor under test via an air tube, and an electromagnetic valve is provided between them. The air passage can be controlled by the host computer control module.

[0031] In component 1), the standard pressure generating device is connected to the PC via an RS232 interface using the Modbus communication protocol, and the pressure value and pressure curve can be set by the host computer.

[0032] In component 2), an industrial camera captures images of the sphygmomanometer, which are then sent to an image display module for real-time display. An image processing and recognition module automatically retrieves the sphygmomanometer reading. The industrial camera and linear guide module are fixed together using a mold.

[0033] In component 3), the linear guide module is used to move the camera up and down. During calibration, the height mark of the mercury column in the camera's field of view is always positioned at the longitudinal center mark of the image, that is, the camera's field of view is always aligned with the convex surface of the mercury column.

[0034] like Figure 6 As shown in Figure 4), the host computer mainly includes an image display module, an image processing and recognition module, a pressure display module, a control module, and a data storage and processing module. Among them:

[0035] An industrial camera captures images from a blood pressure monitor, which are then displayed in real-time via an image display module. An image processing and recognition module processes these images and uses an existing deep learning network model to identify the readings. A data storage and processing module processes and stores the recognition results and the acquired standard pressure values, which are then displayed as a real-time curve by a pressure display module. A control module sends commands to an STM32 microcontroller to generate pressure for calibration experiments. It also controls the airflow through relays controlling the solenoid valves and the dual-axis movement of the guide rail via a guide rail controller. Finally, after the calibration experiment is completed, the data storage and processing module automatically generates an experimental report.

[0036] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0037] like Figure 1 As shown in the embodiment of this application, an automatic calibration device for a mercury sphygmomanometer mainly consists of a standard pressure generating device, a solenoid valve, an experimental black box, a relay, a linear guide module, an industrial camera, and a PC host computer.

[0038] The standard pressure generator communicates with the host computer via the Modbus RS232 interface, thereby controlling the generation of fixed pressure points and related pressure curves through program control. The high-precision digital pressure gauge is connected to the PC via the RS485 communication interface, outputting the calibrated standard pressure value. Four different types of sphygmomanometers (mercury sphygmomanometer, LED sphygmomanometer, pointer sphygmomanometer, and electronic sphygmomanometer) are placed in the experimental black box, forming a closed air circuit with the standard pressure generator through air tubes. Each air circuit is equipped with a solenoid valve, and the on / off state of each solenoid valve is controlled by a relay. The light source in the experimental black box ensures that the industrial camera captures clear images of the sphygmomanometers and avoids the impact of ambient lighting conditions on the subsequent reading recognition algorithm. A bidirectional linear guide module moves the industrial camera within the black box. The horizontal guide rail (x-axis direction) controls the camera's translation between each sphygmomanometer, while the vertical guide rail (y-axis direction) controls the camera's translation along the sphygmomanometer scale. This ensures that the industrial camera's field of view includes a complete image of the instrument and enables real-time tracking of the reading indication lines when calibrating mercury sphygmomanometers and LED sphygmomanometers. The PC-based host computer mainly controls the various devices in the system and processes and stores calibration data.

[0039] In a preferred example, such as Figure 2 As shown, the standard pressure generating device includes a geared motor, a piston-type micro-pressure pump, a digital pressure gauge, and a proximity switch. The geared motor is fixed on a slide rail by a bracket, and its central shaft is connected to the piston rod of the micro-pressure pump via a coupling. This allows the geared motor to drive the piston forward when it rotates, compressing the air inside the micro-pressure pump to generate pressure.

[0040] In a preferred embodiment, the micro-pressure pump has two output ports. One port is connected to a digital pressure gauge, and the output pressure serves as the standard pressure for the calibration system. The other port is equipped with an air delivery tube for pressure output, which can supply the air circuits of four blood pressure monitors. A metal proximity switch is installed at the end of the slide rail, and its main function is to indicate the reset position of the geared motor, allowing the motor to return to the same reset position after each calibration experiment.

[0041] In a preferred example, such as Figure 3 As shown, the piston-type micro-pressure pump has three air outlets: Air outlet one is connected to a digital pressure gauge, which serves as the system's standard gauge and outputs a standard pressure value during calibration experiments; Air outlet two is connected to an exhaust valve, which needs to be opened after the experiment to release the pressure in the system and allow the standard gauge reading to return to zero; Air outlet three uses an air guide tube to connect to a 4-way air distribution module, dividing the air path into four paths for calibration of four different blood pressure monitors. Each path is controlled by a solenoid valve, which can control the opening and closing of each air path. The host computer sets the position of the blood pressure monitor to be tested, which can automatically open the solenoid valve of that air path to open the calibration air path, and simultaneously close other solenoid valves to close other air paths, ensuring pressure stability.

[0042] like Figure 4 As shown, the experimental black box was constructed using industrial aluminum profiles, with light-shielding panels installed around it to prevent ambient light from affecting the recognition results. Each blood pressure monitor to be tested was fixed inside the black box using a designed 3D-printed bracket. The black box mainly consists of a light source, an industrial camera, and a bidirectional linear guide module. The light source provides stable and uniform lighting conditions for the entire black box environment, avoiding the impact of changes in lighting conditions on the image recognition results. The industrial camera is fixed on the guide rail, facing the blood pressure monitor to be tested, and acquires images of the blood pressure monitor in real time. The bidirectional linear guide module consists of two linear guide rail modules, one horizontal (x-axis direction) and one vertical (y-axis direction). The horizontal guide rail controls the camera's translation between each blood pressure monitor; the vertical guide rail controls the camera's vertical movement along the blood pressure monitor's scale, ensuring that the industrial camera's view includes a complete image of the instrument, and enabling real-time tracking of the reading indication lines when calibrating mercury sphygmomanometers and LED light column sphygmomanometers.

[0043] like Figure 5 As shown, the bidirectional guide rail structure mainly consists of two linear guide rail modules: a horizontal (x-axis direction) guide rail and a vertical (y-axis direction) guide rail. The horizontal guide rail controls the translation of the industrial camera between the blood pressure monitors, while the vertical guide rail controls the vertical movement of the camera along the scale of the blood pressure monitor. A baffle is installed on the slide table. A photoelectric switch detects the position of the slide table. When the baffle blocks the light beam, the photoelectric switch outputs a position signal to the host computer, achieving precise control of the camera's movement. This invention is particularly suitable for mercury sphygmomanometers and LED sphygmomanometers, automatically tracking the scale position to ensure accurate readings during calibration. For pointer and digital blood pressure monitors, adjusting the camera height ensures the viewing angle covers the entire instrument image, thus achieving accurate reading identification. This system design effectively improves the efficiency of blood pressure monitor calibration and the accuracy of readings.

[0044] In summary, this invention selects three common types of blood pressure monitors found in existing medical devices: mercury sphygmomanometers, electronic blood pressure monitors, and barometric sphygmomanometers (or barometric sphygmomanometers). It studies and discusses a fully automatic blood pressure monitor calibration device designed using modern artificial intelligence technology and automated control. This device can accurately reflect the indication error, zero-point error, and sensitivity of mercury sphygmomanometers and barometric sphygmomanometers based on auscultation, as well as the static and dynamic errors of electronic blood pressure monitors based on oscillometric methods. It solves the problems of low calibration efficiency, poor accuracy, and cumbersome manual operation in current blood pressure monitor calibration processes both domestically and internationally. This simplifies the calibration work for blood pressure monitors in medical departments and metrology institutions, and promotes the development of blood pressure monitor calibration.

[0045] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. An automatic calibration device for a mercury sphygmomanometer, characterized in that, include: A standard pressure generator serves as a standard gas source, providing the pressure required for calibration. Industrial cameras are used to acquire images from blood pressure monitors; The linear guide module is equipped with an industrial camera to drive the camera's movement and keep the camera's viewpoint aligned with the convex surface of the mercury column during calibration. The host computer is used to configure the calibration device, process calibration data, and print calibration results.

2. The automatic calibration device for a mercury sphygmomanometer according to claim 1, characterized in that, The standard pressure generating device is connected to the blood pressure monitor under test via an air inlet tube, and an electromagnetic valve is installed between them. The air inlet and outlet are controlled by a host computer.

3. The automatic calibration device for a mercury sphygmomanometer according to claim 1, characterized in that, The industrial camera and linear guide module are fixed by a mold, facing the blood pressure monitor. After acquiring the blood pressure monitor image, it is sent to the image display module for real-time image display, and the blood pressure monitor reading is automatically obtained through the image processing and recognition module.

4. An automatic calibration device for a mercury sphygmomanometer according to claim 1 or 2, characterized in that, The host computer includes: Image display module, image processing and recognition module, and control module; The image display module is used to display the acquired blood pressure monitor image in real time; The image processing and recognition module is used to process the acquired blood pressure monitor image and combine it with a deep learning network model to recognize the reading. The control module is used to generate pressure from the standard pressure generating device, control the opening and closing of the air circuit, and simultaneously control the dual-axis movement of the guide rail through the guide rail controller.

5. The automatic calibration device for a mercury sphygmomanometer according to claim 4, characterized in that, The host computer also includes a data storage and processing module; The data storage and processing module is used to process and store the identification results and the collected standard pressure values.

6. The automatic calibration device for a mercury sphygmomanometer according to claim 5, characterized in that, The host computer also includes a pressure display module, which is used to display the collected standard pressure values ​​as real-time curves.

7. The automatic calibration device for a mercury sphygmomanometer according to claim 1, characterized in that, The standard pressure generating device includes a geared motor and a micro-pressure pump; The geared motor is fixed on the slide rail by a bracket, and the central shaft is connected to the piston rod of the micro-pressure pump by a coupling, so that when the geared motor rotates, it drives the piston to advance, compressing the air in the micro-pressure pump to generate pressure.

8. The automatic calibration device for a mercury sphygmomanometer according to claim 7, characterized in that, The micro-pressure pump is equipped with three air outlets: A digital pressure gauge is connected to one of the gas outlets to output the standard pressure value; The second outlet of the gas path is connected to the exhaust valve, which is in the open state after calibration, so that the reading of the digital pressure gauge returns to zero. A gas outlet tube is installed at the third gas outlet to output pressure.

9. The automatic calibration device for a mercury sphygmomanometer according to claim 8, characterized in that, The air duct is connected to multiple air paths, and the on / off state of each air path is independently controlled.

10. The automatic calibration device for a mercury sphygmomanometer according to claim 1, characterized in that, The blood pressure monitor to be tested is placed in an experimental black box, which includes: a light source, an industrial camera, and a linear guide module. The light source is used to provide stable and uniform lighting conditions for the entire black box environment; The industrial camera is fixed on the linear guide module and positioned directly opposite the blood pressure monitor to be tested, for real-time acquisition of images from the blood pressure monitor. The linear guide module is used to control the movement of the industrial camera, ensuring that the industrial camera's field of view includes the complete instrument image, while simultaneously tracking the reading indicator lines in real time.

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