Oedema self-test marking ruler

Abstract

The utility model provides an edema self-test marking ruler, and relates to the field of medical auxiliary equipment.The edema self-test marking ruler comprises a shell, a ruler assembly and a marking piece, and the shell is used for being matched with the palm of a patient and can be fixed relative to the palm of the patient; the ruler assembly comprises a rotating shaft and a ruler body, the rotating shaft is rotatably connected with the shell, the ruler body is wound outside the rotating shaft, the first end of the ruler body is fixedly connected with the rotating shaft, and the second end of the ruler body extends out of the shell; the marking piece is connected with the second end and used for making a mark on the arm of the patient. The marking ruler can be used by a patient independently, measurement is completed independently, use is convenient, errors are small, and accuracy is high.

Description

Technical Field

[0001] The utility model relates to the field of medical auxiliary equipment, in particular to an edema self-testing marking ruler. Background Art

[0002] Cancer-related lymphedema refers to a series of pathological changes such as tissue edema, chronic inflammation, tissue fibrosis and fat fibrosis caused by the retention of protein-rich lymph in the interstitial space due to lymphatic circulation disorders caused by cancer treatment. Such as cervical cancer surgery and breast cancer surgery. Lymphedema is a chronic disease that can cause symptoms such as pain, upper limb swelling, upper limb dysfunction, and psychological reactions such as anxiety, depression, and sadness in patients, which seriously affects the patient's physical, mental, and social functions and quality of life. Although it cannot be cured, if it is not treated and controlled, the risk of tissue fibrosis and edema stage deterioration will increase over time. At present, an important part of home self-care is to monitor the changes in the circumference of the affected limb so that patients can see the effect of treatment and increase their confidence in treatment. The traditional measurement method is generally measured by a therapist with a tape measure in the hospital to obtain baseline data and post-treatment data. When the patient is cared for at home, the family members or the patient measure the tape measure by themselves, and the difference between the before and after data is compared to evaluate the effectiveness of the treatment. During measurement, medical staff and patients need to cooperate in the measurement, which consumes manpower and material resources. In addition, due to errors in manual measurement, the errors will be greater if multiple people cooperate, which is not conducive to treatment. Utility Model Content

[0003] The utility model aims to provide an edema self-testing ruler, which can simplify the measurement method, reduce the measurement difficulty, and reduce the number of measurement personnel. Patients can complete the measurement by themselves and independently, with small errors and high measurement accuracy.

[0004] The embodiment of the utility model is achieved as follows:

[0005] The utility model provides an edema self-testing marking ruler, comprising:

[0006] A shell, a ruler assembly and a marking piece, wherein the shell is used to cooperate with the patient's palm and can remain relatively fixed with the patient's palm; the ruler assembly includes a rotating shaft and a ruler body, the rotating shaft is rotatably connected to the shell, the ruler body is wound outside the rotating shaft, the first end of the ruler body is fixedly connected to the rotating shaft, and the second end of the ruler body extends out of the shell; the marking piece is connected to the second end, and the marking piece is used to mark on the patient's arm.

[0007] In an optional embodiment, the ruler assembly further includes an elastic member, which is connected to the housing and the rotating shaft at the same time and is used to provide the rotating shaft with a torque that causes the ruler body to be wound around the rotating shaft.

[0008] Based on the above solution, the elastic member can provide a certain resistance to the ruler body, so that when the ruler body is pulled for measurement, it is easy to control the length of the ruler body extending out of the shell, and it is not easy to pull the ruler body out too far, and the operation is convenient and reliable. At the same time, when the ruler body is not needed, the pulling force applied to the ruler body is canceled or reduced, and the ruler body is pulled back into the shell under the elastic force of the elastic member for easy storage.

[0009] In an optional embodiment, a pull ring is provided on the shell, and the distance between the pull ring and the shell is adjustable to adjust the position of the starting point of the ruler body relative to the palm of the patient.

[0010] Based on the above scheme, when patients measure themselves, they can put their fingers through the pull ring, and by adjusting the position of the pull ring, the zero scale of the ruler body, that is, the starting point, can be aligned with the corresponding position of the palm, thereby reducing errors and improving measurement accuracy.

[0011] In an optional embodiment, a screw is provided on the shell, a connecting shaft is provided on the pull ring, a threaded sleeve is rotatably sleeved on the outside of the connecting shaft, and the threaded sleeve and the connecting shaft are relatively fixed in the length direction of the connecting shaft; the threaded sleeve is threadedly connected to the screw.

[0012] Based on the above scheme, when the patient's arm to be measured is positioned with the pull ring, the patient's other hand can screw the threaded sleeve to make the shell move back and forth relative to the palm, thereby adjusting the position of the shell, thereby driving the ruler body to adjust its position relative to the palm through the shell, which is easy to operate.

[0013] In an optional embodiment, the edema self-test marking ruler also includes a locking component, which is mounted on the shell, and the locking component has a first state and a second state that can be switched to each other. When in the first state, the locking component locks the ruler body so that the ruler body is fixed relative to the shell; when in the second state, the locking component unlocks the ruler body so that the ruler body can slide relative to the shell.

[0014] Based on the above scheme, when the distance the ruler body is pulled out meets the marking requirements, at this time, the locking assembly is used to lock the ruler body, so that the marking part can be used to mark the corresponding position of the patient's arm. The operation is convenient, and the length of the ruler body is in a locked state during marking and is not easy to change. The marking position is accurate and reliable.

[0015] In an optional embodiment, the locking assembly includes a battery, a controller, an electromagnet, two locking wheels, a sensor and a remote control switch; the battery is electrically connected to the controller and the electromagnet at the same time, and the battery, controller and electromagnet are all installed in the shell; the two locking wheels are rotatably mounted on the shell, and the ruler body is inserted between the two locking wheels and contacts the two locking wheels; the electromagnet is used to magnetically connect with the two locking wheels when power is turned on, so that the two locking wheels are fixed relative to the shell, thereby locking the ruler body; the sensor is installed in the shell, and is used to obtain the angular displacement of one of the two locking wheels; the remote control switch is communicatively connected to the controller, and is used to remotely control the operating state of the electromagnet through the controller.

[0016] Based on the above scheme, the locking assembly has a simple structure, and the control of the electromagnet is realized through the remote control switch, which is convenient to operate. The two locking wheels can not only improve the locking of the ruler body, but also play the role of guiding the ruler body, so that the position of the ruler body is firm and reliable, and the measurement of the ruler body is accurate and reliable. By measuring the rotation angle of the locking wheel, the length of the ruler body pulled out of the shell can be obtained, which is conducive to obtaining the length of the ruler body extending out of the shell, which is conducive to marking.

[0017] In an optional embodiment, the remote control switch is configured as a push-type switch; the marking member comprises a base, a marking body and an elastic body, the base is fixedly connected to the ruler body, an assembly through hole is provided on the base, the marking body can be slidably installed in the assembly through hole, and the marking body has a marking end for marking on the patient's arm; the elastic body is connected to the base and the marking body at the same time, and is used to make the marking end of the marking body have a movement tendency to retract into the assembly through hole; the remote control switch is installed on the marking body;

[0018] When the marking body is pressed to make the marking end extend out of the assembly through hole, the remote control switch is activated and sends an activation signal to the controller, and the controller controls the electromagnet to cut off power.

[0019] Based on the above scheme, the state of the locking component can be adjusted while marking, which saves time and improves measurement efficiency.

[0020] In an optional embodiment, the marking body and the base are relatively fixed in the circumferential direction of the assembly through hole, and the marking end is provided with a groove so that the marking end forms two marking areas spaced apart in the telescopic direction of the ruler body.

[0021] Based on the above scheme, the marking body is pressed on the arm to leave a mark on the arm through the two marking areas. The two marks have a blank area, which corresponds to the width of the tape measure for subsequent measurement of the circumference of the patient's arm. The tape measure can just fit into the blank area, ensuring that the standard of each measurement of the circumference of the arm is consistent, thereby reducing the errors caused by multiple measurements.

[0022] In an optional embodiment, an angle measuring device is provided on the shell, and the angle measuring device is used to obtain an angle of an extension direction of a portion of the ruler body extending out of the shell relative to the shell.

[0023] Based on the above solution, by setting up an angle measuring device, when the ruler body is pulled out, the ruler body will shake relative to the arm, causing the angle between the ruler body and the arm to change. If the angle changes greatly, it will cause large errors in multiple measurements, affecting subsequent results. Therefore, by using an angle measuring device to obtain the angle of the ruler body relative to the arm in real time, it can ensure that the angle of the ruler body relative to the arm is basically consistent during multiple measurements, thereby improving measurement accuracy.

[0024] In an optional embodiment, the edema self-test ruler further includes a display and an alarm both connected to the shell, the display being used to display measurement data, and the alarm being used to sound an alarm when the angle deviation obtained by the angle measuring device exceeds a preset range.

[0025] Based on the above solution, through the cooperation of the display and the alarm, it can be ensured that the ruler body will produce a large position deviation during the measurement process, thereby improving the accuracy of the measurement.

[0026] The beneficial effects of the embodiments of the utility model are:

[0027] In summary, in the edema self-testing ruler provided in this embodiment, the patient positions the housing at the arm to be measured, for example, the housing can be held with the palm of the hand so that the housing and the palm remain relatively fixed. Then, the patient's other arm can operate the ruler, the other arm holds the ruler body, and pulls the ruler body out of the housing, so as to measure the arm through the ruler body, and mark the arm at the corresponding position with the marking piece. Since the patient can measure independently, the operation difficulty is low, the error is small, and the patient can measure at home, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the structure of the edema self-testing ruler according to an embodiment of the utility model;

[0030] Figure 2 It is a schematic cross-sectional view of the edema self-testing marking ruler according to an embodiment of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the ruler assembly of an embodiment of the utility model;

[0032] Figure 4 It is a schematic structural diagram of a marking member according to an embodiment of the utility model.

[0033] icon:

[0034] 100-housing; 110-screw; 200-ruler assembly; 210-rotating shaft; 220-ruler body; 230-elastic member; 300-marking member; 310-base; 320-marking body; 321-groove; 330-elastic body; 400-pull ring; 410-connecting shaft; 420-threaded sleeve; 500-locking assembly; 510-battery; 520-controller; 530-electromagnet; 540-locking wheel; 550-sensor; 560-remote control switch; 600-angle measuring device; 700-display; 800-alarm. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Please combine Figure 1-Figure 4 In this embodiment, the edema self-test ruler includes a shell 100, a ruler assembly 200 and a marking member 300. The shell 100 is used to cooperate with the patient's palm and can remain relatively fixed with the patient's palm; the ruler assembly 200 includes a rotating shaft 210 and a ruler body 220. The rotating shaft 210 is rotatably connected to the shell 100, the ruler body 220 is wound outside the rotating shaft 210, the first end of the ruler body 220 is fixedly connected to the rotating shaft 210, and the second end of the ruler body 220 extends out of the shell 100; the marking member 300 is connected to the second end, and the marking member 300 is used to mark the patient's arm.

[0042] Based on the above, the working principle of the edema self-testing ruler provided in this embodiment is as follows:

[0043] The patient positions the housing 100 at the arm to be measured, for example, by holding the housing 100 with the palm of the hand, so that the housing 100 and the palm remain relatively fixed. Then, the patient's other arm can operate the marking ruler, and the other arm holds the ruler body 220, pulls the ruler body 220 out of the housing 100, so as to measure the arm through the ruler body 220, and marks the arm at the corresponding position with the marking member 300. Since the patient can measure independently, the operation difficulty is low, the error is small, and the patient can measure at home, saving time and effort.

[0044] The following embodiments illustrate the detailed structure of the edema self-testing scale provided in the present application by way of examples.

[0045] In this embodiment, optionally, the ruler assembly 200 further includes an elastic member 230, which is connected to the housing 100 and the rotating shaft 210 at the same time, and is used to provide the rotating shaft 210 with a torque that causes the ruler body 220 to be wound outside the rotating shaft 210. When in use, the elastic member 230 can provide a certain resistance when the patient pulls the ruler body 220 to extend it out of the housing 100, and it is not easy for the ruler body 220 to be pulled out too far, so that when the ruler body 220 is pulled for measurement, it is convenient to control the length of the ruler body 220 extending out of the housing 100, and the operation is convenient and reliable. At the same time, when the ruler body 220 is not needed, the pulling force applied to the ruler body 220 is canceled or reduced, and the ruler body 220 is pulled back into the housing 100 under the elastic force of the elastic member 230, so that it is easy to store.

[0046] It should be understood that the ruler body 220 may be a torsion spring or a spring, etc.

[0047] In this embodiment, a pull ring 400 is optionally provided on the housing 100, and the distance between the pull ring 400 and the housing 100 is adjustable to adjust the position of the starting point of the ruler body 220 relative to the patient's palm. When the patient measures by himself, he can use his fingers to pass through the pull ring 400, and by adjusting the position of the pull ring 400, the zero scale of the ruler body 220, that is, the starting point, can be aligned with the corresponding position of the palm, thereby reducing errors and improving measurement accuracy.

[0048] Optionally, a screw 110 is provided on the housing 100, a connecting shaft 410 is provided on the pull ring 400, a threaded sleeve 420 is rotatably sleeved on the outside of the connecting shaft 410, the threaded sleeve 420 and the connecting shaft 410 are relatively fixed in the length direction of the connecting shaft 410; the threaded sleeve 420 is threadedly connected to the screw 110. After the patient's arm to be measured and the pull ring 400 are positioned, the patient's other hand can screw the threaded sleeve 420, so that the housing 100 moves back and forth relative to the palm, and the position of the housing 100 is adjusted, so that the housing 100 drives the ruler body 220 to adjust its position relative to the palm through the housing 100, which is easy to operate.

[0049] It should be understood that the outer circumference of the threaded sleeve 420 may be provided with an anti-skid rubber layer, which may be a rubber layer, which may be heat-sealed outside the threaded sleeve 420 , and the outer circumference of the anti-skid rubber layer may be provided with anti-skid grooves.

[0050] In this embodiment, optionally, the edema self-test marking ruler also includes a locking assembly 500, which is installed on the shell 100. The locking assembly 500 has a first state and a second state that can be switched to each other. When in the first state, the locking assembly 500 locks the ruler body 220 to fix the ruler body 220 relative to the shell 100; when in the second state, the locking assembly 500 unlocks the ruler body 220 to allow the ruler body 220 to slide relative to the shell 100.

[0051] It should be noted that when the distance the ruler body 220 is pulled out meets the marking requirements, at this time, the locking assembly 500 is used to lock the ruler body 220, so that the marking part 300 can be used to mark the corresponding position of the patient's arm. The operation is convenient, and the length of the ruler body 220 is in a locked state during marking and is not easy to change. The marking position is accurate and reliable.

[0052] Please combine Figure 2 and Figure 3 In this embodiment, optionally, the locking assembly 500 includes a battery 510, a controller 520, an electromagnet 530, two locking wheels 540, a sensor 550 and a remote control switch 560; the battery 510 is electrically connected to the controller 520 and the electromagnet 530 at the same time, and the battery 510, the controller 520 and the electromagnet 530 are all installed in the housing 100; the two locking wheels 540 can be rotatably installed on the housing 100, and the ruler body 220 is arranged between the two locking wheels 540 and contacts the two locking wheels 540; the electromagnet 530 is used to be magnetically adsorbed and connected with the two locking wheels 540 when power is turned on, so that the two locking wheels 540 are fixed relative to the housing 100, thereby locking the ruler body 220; the sensor 550 is installed on the housing 100, and is used to obtain the angular displacement of one of the two locking wheels 540; the remote control switch 560 is connected to the controller 520 for remotely controlling the operating state of the electromagnet 530 through the controller 520.

[0053] It should be understood that the locking assembly 500 has a simple structure, and the control of the electromagnet 530 is realized by the remote control switch 560, which is convenient to operate. The two locking wheels 540 can not only improve the locking of the ruler body 220, but also play the role of guiding the ruler body 220, so that the position of the ruler body 220 is firm and reliable, and the measurement of the ruler body 220 is accurate and reliable. By measuring the rotation angle of the locking wheel 540, the length of the ruler body 220 pulled out of the housing 100 can be obtained, which is conducive to obtaining the length of the ruler body 220 extending out of the housing 100, which is conducive to marking.

[0054] Please combine Figure 4 , further, the remote control switch 560 is configured as a push-type switch, for example, the remote control switch 560 has a first conductive sheet and a second conductive sheet. The marking member 300 includes a base 310, a marking body 320 and an elastic body 330. The base 310 is fixedly connected to the ruler body 220. The base 310 is provided with an assembly through hole. The marking body 320 can be slidably installed in the assembly through hole. The marking body 320 has a marking end for marking on the patient's arm; the elastic body 330 is connected to the base 310 and the marking body 320 at the same time, so that the marking end of the marking body 320 has a movement tendency to retract into the assembly through hole; the first conductive sheet of the remote control switch 560 is installed on the base 310, and the second conductive sheet of the remote control switch 560 is installed on the marking body 320. When the marking body 320 is pressed to make the marking end extend out of the assembly through hole, the remote control switch 560 is activated and sends an activation signal to the controller 520, and the controller 520 controls the electromagnet 530 to cut off the power.

[0055] That is, under the elastic force of the elastic body 330, the first conductive sheet and the second conductive sheet are in a normally open state, and the remote control switch 560 will not send a signal to the controller 520, and will not control the electromagnet 530 to be powered off. When the marking body 320 is pressed to mark, the marking body 320 moves close to the base 310, the first conductive sheet and the second conductive sheet contact, and the remote control switch 560 is activated, thereby controlling the electromagnet 530 to be powered off through the controller 520. In this way, the state of the locking component 500 can be adjusted while marking, saving time and improving measurement efficiency.

[0056] It should be understood that the elastic body 330 may be a spring.

[0057] In this embodiment, optionally, the marking body 320 and the base body 310 are relatively fixed in the circumferential direction of the assembly through hole, and a groove 321 is provided at the marking end, so that the marking end forms two marking areas arranged at intervals in the extension direction of the ruler body 220. In this way, the marking body 320 is pressed on the arm to leave a mark on the arm through the two marking areas, and the two marks have a blank area, which corresponds to the width of the tape measure for subsequent measurement of the circumference of the patient's arm. The tape measure can just fit into the blank area, ensuring that the standard of each measurement of the circumference of the arm is consistent, reducing the error caused by multiple measurements.

[0058] In other embodiments, optionally, an angle measuring device 600 is disposed on the housing 100 , and the angle measuring device 600 is used to obtain an angle of an extension direction of a portion of the ruler body 220 extending out of the housing 100 relative to the housing 100 .

[0059] In this design, by setting the angle measuring device 600, when the ruler body 220 is pulled out, the ruler body 220 will shake relative to the arm, causing the angle between the ruler body 220 and the arm to change. If the angle changes greatly, it will cause large errors in multiple measurements, affecting subsequent results. Therefore, by using the angle measuring device 600 to obtain the angle of the ruler body 220 relative to the arm in real time, it can ensure that the angle of the ruler body 220 relative to the arm is basically consistent during multiple measurements, thereby improving measurement accuracy.

[0060] In other embodiments, optionally, the edema self-testing ruler also includes a display 700 and an alarm 800 both connected to the housing 100, the display 700 is used to display the measurement data, and the alarm 800 is used to sound an alarm when the angle deviation obtained by the angle measuring device 600 exceeds a preset range. It should be understood that by cooperating with the display 700 and the alarm 800, it is possible to ensure that the ruler body 220 produces a large position deviation during the measurement process, thereby improving the accuracy of the measurement. The alarm 800 can emit an alarm signal such as sound and light. The display 700 can broadcast the measurement data through a speaker, and the measurement data can include the length of the ruler body 220 extending out, and can also include the angle of the ruler body 220 relative to the housing 100, etc.

[0061] It should be understood that equally spaced marking portions may also be provided on the ruler body 220. The marking portions may be marking lines. When the marking lines just leave the housing 100, the marking is performed using the marking member 300. In this way, the accuracy and reliability of the marking position are improved by measuring the angular displacement of the locking wheel 540 and cooperating with the marking portion to characterize the marking position.

[0062] The edema self-measurement ruler provided in this embodiment can be used by patients themselves and can be operated by one person. It has low operating difficulty, is easy to operate, has small errors, and has high measurement accuracy.

[0063] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A self-testing scale for edema, characterized in that: include: A shell, a ruler assembly and a marking piece, wherein the shell is used to cooperate with the patient's palm and can remain relatively fixed with the patient's palm; the ruler assembly includes a rotating shaft and a ruler body, the rotating shaft is rotatably connected to the shell, the ruler body is wound outside the rotating shaft, the first end of the ruler body is fixedly connected to the rotating shaft, and the second end of the ruler body extends out of the shell; the marking piece is connected to the second end, and the marking piece is used to mark on the patient's arm.

2. The edema self-testing ruler according to claim 1, characterized in that: The ruler assembly further includes an elastic member, which is connected to the housing and the rotating shaft at the same time and is used to provide the rotating shaft with a torque that causes the ruler body to be wound around the rotating shaft.

3. The edema self-testing ruler according to claim 1, characterized in that: The shell is provided with a pull ring, and the distance between the pull ring and the shell is adjustable to adjust the position of the starting point of the ruler body relative to the patient's palm.

4. The edema self-testing ruler according to claim 3, characterized in that: The shell is provided with a screw rod, the pull ring is provided with a connecting shaft, a threaded sleeve is rotatably sleeved outside the connecting shaft, the threaded sleeve and the connecting shaft are relatively fixed in the length direction of the connecting shaft; the threaded sleeve is threadedly connected to the screw rod.

5. The edema self-testing ruler according to claim 1, characterized in that: The edema self-test marking ruler also includes a locking component, which is installed on the shell. The locking component has a first state and a second state that can be switched to each other. When in the first state, the locking component locks the ruler body so that the ruler body is fixed relative to the shell; when in the second state, the locking component unlocks the ruler body so that the ruler body can slide relative to the shell.

6. The edema self-testing ruler according to claim 5, characterized in that: The locking assembly includes a battery, a controller, an electromagnet, two locking wheels, a sensor and a remote control switch; the battery is electrically connected to the controller and the electromagnet at the same time, and the battery, controller and electromagnet are all installed in the shell; the two locking wheels are rotatably installed on the shell, and the ruler body is inserted between the two locking wheels and contacts the two locking wheels; the electromagnet is used to be magnetically adsorbed and connected to the two locking wheels when power is turned on, so that the two locking wheels are fixed relative to the shell, thereby locking the ruler body; the sensor is installed on the shell, and is used to obtain the angular displacement of one of the two locking wheels; the remote control switch is communicatively connected to the controller, and is used to remotely control the operating state of the electromagnet through the controller.

7. The edema self-testing ruler according to claim 6, characterized in that: The remote control switch is configured as a push-type switch; the marking member comprises a base, a marking body and an elastic body, the base is fixedly connected to the ruler body, an assembly through hole is provided on the base, the marking body can be slidably installed in the assembly through hole, and the marking body has a marking end for marking on the patient's arm; the elastic body is connected to the base and the marking body at the same time, and is used to make the marking end of the marking body have a movement tendency to retract into the assembly through hole; the remote control switch is installed on the marking body; When the marking body is pressed to make the marking end extend out of the assembly through hole, the remote control switch is activated and sends an activation signal to the controller, and the controller controls the electromagnet to cut off power.

8. The edema self-testing ruler according to claim 7, characterized in that: The marking body and the base are relatively fixed in the circumferential direction of the assembly through hole, and the marking end is provided with a groove so that the marking end forms two marking areas arranged at intervals in the telescopic direction of the ruler body.

9. The edema self-testing ruler according to any one of claims 1 to 8, characterized in that: An angle measuring device is provided on the shell, and the angle measuring device is used to obtain an angle of an extension direction of a portion of the ruler body extending out of the shell relative to the shell.

10. The edema self-testing ruler according to claim 9, characterized in that: The edema self-testing ruler also includes a display and an alarm both connected to the housing, wherein the display is used to display measurement data, and the alarm is used to sound an alarm when the angle deviation obtained by the angle measuring device exceeds a preset range.

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