Edema limb measuring instrument

Abstract

The utility model relates to an edema limb measuring instrument which comprises a TOF distance measuring sensor and a shell, the shell is of a frame structure, and the lower portion of the shell is in an opening shape. A plurality of first TOF distance measuring sensors are arranged on the inner side of the shell, and the first TOF distance measuring sensors are used for measuring circumference data of the surface of a measured limb; a plurality of second TOF distance measuring sensors are arranged on the front side and the rear side of the shell, and the second TOF distance measuring sensors are used for measuring the distance of the shell horizontally moving back and forth along the measured limb; the system further comprises a processor, the processor is connected with the first TOF distance measuring sensor and the second TOF distance measuring sensor, and the processor is used for calculating and processing data collected by the distance measuring sensors to obtain measured data of the measured limb. The device does not need to be in contact with skin, skin infection is avoided, the measurement accuracy is high, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to an instrument for measuring edema limbs. Background Art

[0002] Edema, a symptom of excessive fluid retention in the interstitial spaces, is a common clinical condition and can be caused by a wide range of diseases. Patients with edema often experience limb swelling. The degree of edema is typically graded by pressing the edematous area to see how long it takes for the indentation to disappear, and by measuring the circumference of the edematous area.

[0003] Currently, commonly used detection and evaluation indicators include tape circumference measurement and water displacement volume measurement. Subsequent methods include Perometer equipment, bioelectrical impedance analysis equipment, isotope lymphography, and near-infrared fluorescence imaging. These methods have the following drawbacks:

[0004] Arm circumference measurement with a tape measure: The doctor places a tape measure around the swollen limb and reads the arm circumference at a specific location. This method is primitive and simple, but lacks a unified standard. There's no fixed measurement location or tightness, and the tightness of the tape can lead to significant errors in arm circumference assessment. Furthermore, the tape needs to come into contact with the skin during measurement, increasing the risk of skin infection.

[0005] The water displacement volume method involves immersing the patient's swollen arm in a graduated container of water (of a known volume). As the arm is immersed, the water rises or overflows, and the change in liquid level is read as the arm's volume. This method has no fixed standard for arm immersion depth. Due to the varying degrees of swelling, a single graduated container is insufficient. The water and container can increase the risk of skin infection. Furthermore, the frequency of changing the water for each patient wastes time and complicates the procedure.

[0006] Electronic devices such as perometers and bioelectrical impedance analyzers are expensive and are not widely available for daily measurement in primary hospitals or individuals. Utility Model Content

[0007] The invention aims to provide an instrument for measuring limb edema, which does not need to contact with the skin, avoids skin infection, has high measurement accuracy and low manufacturing cost.

[0008] The technical solution to achieve the purpose of this utility model invention is:

[0009] An edema limb measurement instrument, comprising a TOF distance measuring sensor, characterized in that: it further comprises a housing, the housing being a frame structure, and the lower portion of the housing being open;

[0010] A plurality of first TOF distance measuring sensors are provided on the inner side of the housing, and the first TOF distance measuring sensors are used to measure the circumference data of the surface of the measured limb;

[0011] A plurality of second TOF ranging sensors are provided on the front and rear sides of the housing, and the second TOF ranging sensors are used to measure the distance the housing moves horizontally forward and backward along the measured limb;

[0012] It also includes a processor, which is connected to the first TOF ranging sensor and the second TOF ranging sensor. The processor is used to calculate and process the data collected by the ranging sensors to obtain measurement data of the measured limb.

[0013] Furthermore, the cross section of the shell is semicircular.

[0014] Furthermore, a plurality of first TOF ranging sensors are located in the same cross section of the shell and are evenly spaced along the circumference of the shell.

[0015] Furthermore, the second TOF ranging sensors are evenly spaced along the circumference of the shell.

[0016] Furthermore, three second TOF ranging sensors are respectively provided on the front side and the rear side of the shell.

[0017] Furthermore, a handle is connected to the outside of the shell.

[0018] Furthermore, it includes an OLED display screen, which is connected to the processor and is used to display measurement data.

[0019] Furthermore, the OLED display screen is located on the top of the housing.

[0020] Furthermore, it includes a storage unit, and the storage unit is connected to the processor.

[0021] The utility model has the beneficial effects:

[0022] The utility model includes a TOF ranging sensor and a shell, wherein the shell is a frame structure and the lower part of the shell is open; a plurality of first TOF ranging sensors are provided on the inner side of the shell, and the first TOF ranging sensors are used to measure the circumference data of the surface of the measured limb; a plurality of second TOF ranging sensors are provided on the front and rear sides of the shell, and the second TOF ranging sensors are used to measure the distance the shell moves horizontally forward and backward along the measured limb; and a processor is also included, wherein the processor is connected to the first TOF ranging sensors and the second TOF ranging sensors, and the processor is used to calculate and process the data collected by the ranging sensors to obtain measurement data of the measured limb. The utility model uses a TOF distance measuring sensor to perform measurements without contacting the skin, thus avoiding skin infection. During measurement, the utility model moves horizontally back and forth along the measured limb, and through multiple first TOF distance measuring sensors, the circumference data of multiple sections of the measured limb can be measured. Through the second TOF distance measuring sensor, the distance of the instrument's horizontal movement back and forth can be measured. Combined with the circumference data of multiple sections of the measured limb, the volume of the measured limb can be obtained. The measurement results are accurate and reliable, and compared with electronic equipment such as perometer equipment and bioelectrical impedance analysis equipment, the manufacturing cost is low.

[0023] The housing of the present invention has a semicircular cross-section. The first TOF distance measuring sensors are located on the same cross-section of the housing and are evenly spaced along the circumference of the housing. Second TOF distance measuring sensors are evenly spaced along the circumference of the housing. Three second TOF distance measuring sensors are located on the front and rear of the housing, respectively. Through this housing shape design and the arrangement of the TOF distance measuring sensors, the present invention further ensures accurate and reliable measurement results.

[0024] The utility model includes an OLED display screen connected to a processor for displaying measurement data; the OLED display screen is located on the top of the housing; and a storage unit connected to the processor. The utility model utilizes the OLED display screen and memory configuration to facilitate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the principle of measuring the surface circumference data of a measured limb according to the utility model;

[0027] Figure 3 This is a schematic diagram of the principle of the utility model for measuring the horizontal movement distance of the housing along the measured limb;

[0028] Figure 4 This is a schematic diagram of the working principle of the existing TOF ranging sensor. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not limitations of the present invention, and any structural equivalent transformations or substitutions made by ordinary technicians in this field based on these embodiments are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, the present invention's edema limb measurement instrument includes a TOF distance sensor and a housing 1. The housing 1 is a frame structure, and the lower portion of the housing is open. In a specific implementation, the cross-section of the housing is semicircular. Multiple first TOF distance sensors 4 are provided on the inner side of the housing 1. The first TOF distance sensors 4 are used to measure the circumference data of the surface of the measured limb. The multiple first TOF distance sensors 4 are located on the same cross-section of the housing and are evenly spaced along the circumference of the housing 1. Multiple second TOF distance sensors 5 are provided on the front and rear sides of the housing 1. The second TOF distance sensors 5 are used to measure the distance the housing moves horizontally forward and backward along the measured limb. The second TOF distance sensors are evenly spaced along the circumference of the housing. In a specific implementation, three second TOF distance sensors are provided on the front and rear sides of the housing, respectively. The housing 1 is externally connected to a handle 2.

[0031] The device further comprises a processor, the processor being connected to the first TOF distance measuring sensor 4 and the second TOF distance measuring sensor 5, the processor being used to perform calculations on the data collected by the distance measuring sensors to obtain the measured limb measurement data. The device further comprises a storage unit connected to the processor. The device further comprises an OLED display 3 connected to the processor for displaying the measurement data. The OLED display 3 is located at the top of the housing, and the OLED display, processor, storage unit, and power supply battery are integrated into a module. The processor adopts an STM32 processor, and the power supply battery adopts a lithium battery.

[0032] The utility model utilizes the existing TOF sensor and adopts a non-contact method to measure the limb to be measured. The full name of TOF in English is Time of fl ight, which is translated into time of flight in Chinese. TOF is a distance measurement method and belongs to the existing technology. It calculates the distance between the two by measuring the "flight time" of ultrasonic / microwave / light and other signals between the transmitter and the reflector. The sensor that can realize TOF distance measurement is the TOF sensor. There are many types of TOF sensors, and the most commonly used ones are TOF sensors that measure distance through infrared or laser. Figure 4As shown, this utility model uses a laser TOF sensor. The sensor uses a tiny emitter to emit laser light, which is reflected from the object being measured and returned to the sensor. Based on the time difference between the light being emitted and the light being reflected by the object and returning to the sensor, the sensor can measure the distance between the object and the sensor: d = the speed of light c*t / 2, with a measurement error of less than 1 mm.

[0033] like Figure 2 、 Figure 3 As shown, the present invention uses multiple first TOF sensors to measure the distance from the limb to the sensor from different angles along the cross section of the limb being measured. Figure 2 In the figure, d1 to dn are the distances between the first to nth TOF sensors and the surface of the limb being measured, and as the measuring instrument moves along the axis of the limb, multiple measurements are taken at intervals of 2 milliseconds (assuming that the moving speed when using the present invention for detection is 0.5 m / s, the scanning interval is 0.5*1000*2 / 1000=1 mm, that is, the present invention performs a circumference scanning measurement every time the limb moves 1 mm along the axis). Finally, the circumference data of multiple sections of the limb being measured can be generated in a manner similar to CT. The processor calculates these data and uses the existing multi-point fitting curve algorithm to obtain the circumference data and volume data of the limb being measured. Figure 3 As shown, when the measuring instrument moves along the axial direction of the limb, the patient can stand on the ground or lie flat on the bed. The standing position can choose the ground as the reference plane, and the lying position can choose the wall facing the end of the bed as the reference plane. If the wall is too far away or there is an obstacle in the middle, a baffle (medical record folder, book, etc.) can be placed at the end of the bed as a reference plane. Before the measurement starts, the second TOF sensor 5 corresponding to the side of the reference plane is selected through the OLED display (touch screen). After the measurement starts, the second TOF sensor 5 will record the distance moved by the measuring instrument. During measurement, the measuring instrument is usually not able to keep level with the reference plane. In this case, the processor can calculate the different data measured by the three second TOF sensors 5 through the existing multi-point fitting plane calculation method to obtain the relative parallel position of the measuring instrument and the reference plane, and then calculate the effective distance between the measuring instrument and the reference plane based on the relative parallel position.

[0034] During use, the patient takes a standing position or lies flat on the bed and takes a supine position for detection. Taking a supine position requires seeing whether there is a wall opposite the end of the bed that can be used as a reference plane. If not, it is necessary to place a baffle at the end of the bed to make a reference plane. Turn on the measuring instrument, and according to the hand-held direction, select the second TOF sensor 5 with a reference plane side on the OLED display (touch screen), and move the measuring instrument to the end (such as the ankle) where the limbs start to be measured to ensure that the housing of the measuring instrument wraps around the measured limbs. Select to start measuring through the touch screen, and now the measuring instrument can be moved to the other side of the limbs. Now the touch screen will display the distance moved. When the end measurement position is reached (such as the knee joint), stop measuring by touching the screen. Now the processor calculates the collected data and presents the measurement results through the touch screen. In order to ensure the consistency of multiple measurement results. A certain distance can be scanned after starting to measure, such as setting 50cm. Now the measuring instrument only records data within 50cm from the start of measurement, and data out of range is not recorded. You can set the measurement to only measure a certain distance around the maximum circumference, for example, 10cm. After measuring the entire calf, the instrument automatically calculates the maximum circumference and takes the data plus or minus 10cm, for a total of 20cm, as the measurement result. The circumference and volume of the measured limb can be viewed on the touchscreen and compared with previously stored measurements.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. An edema limb measurement instrument, comprising a TOF ranging sensor, characterized in that: It also includes a shell, the shell is a frame structure, and the lower part of the shell is open; A plurality of first TOF distance measuring sensors are provided on the inner side of the housing, and the first TOF distance measuring sensors are used to measure the circumference data of the surface of the measured limb; A plurality of second TOF ranging sensors are provided on the front and rear sides of the housing, and the second TOF ranging sensors are used to measure the distance the housing moves horizontally forward and backward along the measured limb; It also includes a processor, which is connected to the first TOF ranging sensor and the second TOF ranging sensor. The processor is used to calculate and process the data collected by the ranging sensors to obtain measurement data of the measured limb.

2. The edema limb measuring instrument according to claim 1, characterized in that: The cross section of the shell is in a semicircular arc shape.

3. The edema limb measuring instrument according to claim 2, characterized in that: The plurality of first TOF distance measuring sensors are located in the same cross section of the shell and are evenly spaced along the circumference of the shell.

4. The edema limb measuring instrument according to claim 2, characterized in that: The second TOF distance measuring sensors are evenly spaced along the circumference of the shell.

5. The edema limb measuring instrument according to claim 4, characterized in that: Three second TOF ranging sensors are respectively provided on the front and rear sides of the shell.

6. The edema limb measuring instrument according to claim 1, characterized in that: The shell is externally connected with a handle.

7. The limb edema measuring instrument according to any one of claims 1 to 6, characterized in that: It includes an OLED display screen, which is connected to a processor and is used to display measurement data.

8. The edema limb measuring instrument according to claim 7, characterized in that: The OLED display screen is located on the top of the housing.

9. The limb edema measuring instrument according to claim 7, characterized in that: It includes a storage unit connected to the processor.

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