Pipe diameter measuring ruler

Abstract

The present invention relates to the technical field of medical devices, and discloses a pipe diameter measuring ruler. The wearing sleeve is directly sleeved on the finger, without the need to hold the measuring tool, saving the operation space. The rotating wheel is coaxially and rotatably sleeved on the outside of the wearing sleeve, and the wearing sleeve is located at the center of the rotating wheel, providing stable rotational support for the rotating wheel. The outer diameters of the measuring heads of multiple measuring columns are all different to meet the high-precision measurement requirements of different blood vessels and expand the applicable range of the pipe diameter measuring ruler. The multiple measuring columns are arranged at intervals along the circumferential direction of the rotating wheel, and the measuring columns are located on one end face of the rotating wheel close to the finger head. The axial direction of the measuring columns is parallel to the axial direction of the rotating wheel. The arrangement of the measuring columns and the design of the rotating wheel can avoid the problem of inconvenient operation caused by the distance between the measuring heads. Only by simply pushing the rotating wheel can the appropriate measuring column be quickly switched to the appropriate position to complete the selection of the measuring column, and the measuring operation is more smooth and convenient, improving the efficiency of the surgical operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a pipe diameter measuring ruler. Background Art

[0002] In vascular anastomosis, accurately measuring the diameter of blood vessels plays a crucial role in the success of the surgery. Accurate and appropriate measurement results of blood vessel diameters can help medical workers accurately select suitable vascular anastomosis devices, thereby improving the anastomosis effect and reducing the incidence of postoperative complications.

[0003] However, there are some defects in the traditional blood vessel diameter measuring tools currently used clinically. For example: they are inconvenient to operate. Most measuring tools need to be held and operated by medical workers. In a limited operating space, especially during delicate vascular anastomosis, holding the measuring tool may interfere with the surgical operation and increase the surgical difficulty; the measurement accuracy is limited. The design of the distance between the measuring heads of some measuring tools is not reasonable enough. When measuring some blood vessels with a small diameter, due to the limited measurement space, the measuring tool cannot be placed at a suitable angle for measuring the blood vessel diameter, affecting the accuracy of the measurement results and making it difficult to meet the requirements of high-precision measurement for vascular anastomosis.

[0004] Therefore, there is an urgent need for a measuring tool that can effectively solve the above problems to meet the clinical needs of vascular anastomosis. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipe diameter measuring ruler, which can save the operating space, improve the measurement efficiency, reduce the operation difficulty, and at the same time meet the high-precision measurement requirements of different blood vessels.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The pipe diameter measuring ruler includes:

[0008] A wearing shaft sleeve, which is used to be sleeved around the finger, and the inner diameter of the wearing shaft sleeve is greater than or equal to the outer diameter of the wearing position of the finger;

[0009] A rotating wheel, which is sleeved on the outside of the wearing shaft sleeve, and the rotating wheel is coaxially rotatably connected to the wearing shaft sleeve;

[0010] Measuring columns, there are multiple measuring columns, the outer diameters of the measuring heads of the multiple measuring columns are all different, the multiple measuring columns are arranged at intervals along the circumferential direction of the rotating wheel, and the measuring columns are located at one end of the rotating wheel close to the finger head, and the axial direction of the measuring columns is parallel to the axial direction of the rotating wheel.

[0011] As an optional technical solution for the pipe diameter measuring ruler, a mounting groove is provided on the inner side of the rotating wheel, and a rotation gap is provided between the inner diameter of the mounting groove and the outer diameter of the wearing sleeve so that the wearing sleeve can be embedded in the mounting groove, and one end of the wearing sleeve is abutted against the bottom of the mounting groove, and a first wearing through hole is provided at the bottom of the mounting groove, and the inner diameter of the first wearing through hole is greater than or equal to the inner diameter of the wearing sleeve.

[0012] As an optional technical solution for the pipe diameter measuring ruler, the pipe diameter measuring ruler also includes a retaining ring, which is fixed at the top of the mounting groove and abuts against the wearing sleeve. The retaining ring is provided with a second wearing through hole, and the inner diameter of the second wearing through hole is greater than or equal to the inner diameter of the wearing sleeve.

[0013] As an optional technical solution for the pipe diameter measuring ruler, the measuring column is detachably connected to the rotating wheel.

[0014] As an optional technical solution for the pipe diameter measuring ruler, the measuring column includes a connecting part, an identification part and the measuring head which are connected in sequence, the connecting part is threadedly connected to the rotating wheel, the identification part corresponds one-to-one with the measuring head, and the outer diameter value of the measuring head is displayed on the identification part.

[0015] As an optional technical solution for the pipe diameter measuring ruler, the marking portion is configured as a multi-faceted prism, and each face of the multi-faceted prism displays the outer diameter value of the measuring head.

[0016] As an optional technical solution for the pipe diameter measuring ruler, the pipe diameter measuring ruler also includes a plug, and there are multiple plugs. The rotating wheel is provided with multiple thread grooves, some of the thread grooves are connected one-to-one with the connecting part, and the remaining thread grooves are connected one-to-one with the plugs.

[0017] As an optional technical solution for the pipe diameter measuring ruler, an anti-slip portion is provided on the inner side of the wearing sleeve.

[0018] As an optional technical solution for the pipe diameter measuring ruler, the wearing sleeve is configured as a bearing, the inner ring of the bearing is used to be sleeved on the outside of the finger, and the outer ring of the bearing is fixed to the rotating wheel so that the rotating wheel and the inner ring of the bearing are coaxially rotatably connected.

[0019] As an optional technical solution for the pipe diameter measuring ruler, a stop protrusion is provided on the outer side of the rotating wheel.

[0020] Beneficial effects of the present invention:

[0021] The pipe diameter measuring ruler provided by the present invention includes a wearing bushing, a rotating wheel, and measuring columns. The wearing bushing is used to be sleeved around the finger periphery. The inner diameter of the wearing bushing is greater than or equal to the outer diameter of the wearing position of the finger. With the wearable design, the pipe diameter measuring ruler can be selectively worn on the index finger. During a surgical procedure such as vascular anastomosis that requires delicate operations and has extremely limited operating space, the doctor does not need to hold an additional measuring tool, saving the operating space. The rotating wheel is sleeved on the outside of the wearing bushing, and the rotating wheel is coaxially rotatably connected to the wearing bushing. The wearing bushing is located at the center of the rotating wheel, providing stable rotational support for the rotating wheel. A plurality of measuring columns are provided, and the outer diameters of the measuring heads of the plurality of measuring columns are all different to meet the high-precision measurement requirements of different blood vessels and expand the applicable range of the pipe diameter measuring ruler. The plurality of measuring columns are arranged at intervals along the circumferential direction of the rotating wheel, and can change positions as the rotating wheel rotates. The measuring columns are located on one end face of the rotating wheel close to the finger tip, and the axial direction of the measuring columns is parallel to the axial direction of the rotating wheel. The arrangement of the measuring columns and the design of the rotating wheel can avoid operation difficulties caused by problems with the spacing between the measuring heads. Just simply pushing the rotating wheel can quickly switch the appropriate measuring column to the appropriate position, completing the selection and measurement operations of the measuring column, making the measurement operation smoother and more convenient, and greatly improving the efficiency of the surgical operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 6 is a schematic structural diagram of the pipe diameter measuring ruler from the first perspective provided by the specific embodiment of the present invention;

[0023] Figure 2 FIG. 10 is a cross-sectional view of the pipe diameter measuring ruler provided by the specific embodiment of the present invention;

[0024] Figure 3 FIG. 14 is a schematic structural diagram of the pipe diameter measuring ruler from the second perspective provided by the specific embodiment of the present invention;

[0025] Figure 4 FIG. 18 is a schematic structural diagram of the rotating wheel of the pipe diameter measuring ruler provided by the specific embodiment of the present invention;

[0026] Figure 5 FIG. 22 is a schematic structural diagram of the pipe diameter measuring ruler from the first perspective provided by another embodiment of the specific embodiment of the present invention;

[0027] Figure 6 FIG. 26 is a schematic structural diagram of the pipe diameter measuring ruler from the second perspective provided by another embodiment of the specific embodiment of the present invention;

[0028] Figure 7 FIG. 30 is a schematic structural diagram of the pipe diameter measuring ruler (the retaining ring is not shown) provided by another embodiment of the specific embodiment of the present invention;

[0029] Figure 8It is a schematic structural diagram of the rotating wheel of the pipe diameter measuring ruler according to another embodiment provided by the specific embodiment of the present invention;

[0030] Figure 9 It is a schematic structural diagram of the measuring column of the pipe diameter measuring ruler provided by the specific embodiment of the present invention.

[0031] In the figure:

[0032] 100, wearing bushing; 110, bearing;

[0033] 200, rotating wheel; 201, mounting groove; 202, first wearing through hole; 203, dial stop protrusion;

[0034] 300, measuring column; 301, measuring head; 302, marking part; 303, connecting part;

[0035] 400, retaining ring; 401, second wearing through hole. Specific Embodiment

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the first and second features being in direct contact, or can also include the first and second features not being in direct contact but being in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", "left", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0040] As Figures 1 to 9 shown, the present invention discloses a pipe diameter measuring ruler, which includes a wearing bushing 100, a rotating wheel 200 and a measuring column 300. The wearing bushing 100 is used to be sleeved around the finger. The inner diameter of the wearing bushing 100 is greater than or equal to the outer diameter of the wearing position of the finger. With the wearing design, the pipe diameter measuring ruler can be selectively worn on the index finger. During the surgical process such as vascular anastomosis that requires delicate operations and has extremely limited operating space, the doctor does not need to hold the measuring tool additionally, saving the operating space.

[0041] The rotating wheel 200 is sleeved on the outside of the wearing bushing 100, and the rotating wheel 200 is coaxially rotatably connected to the wearing bushing 100. The wearing bushing 100 is located at the center of the rotating wheel 200, providing stable rotational support for the rotating wheel 200. There are multiple measuring columns 300. The outer diameters of the measuring heads 301 of the multiple measuring columns 300 are all different. The diameter of each measuring column 300 is precisely set according to the clinically common blood vessel diameter range, which can meet the high-precision measurement requirements of different blood vessels and expand the applicable range of the pipe diameter measuring ruler. The multiple measuring columns 300 are arranged at intervals along the circumferential direction of the rotating wheel 200, and can change positions as the rotating wheel 200 rotates. And the measuring columns 300 are located on the end face of the rotating wheel 200 close to the finger tip. The axial direction of the measuring columns 300 is parallel to the axial direction of the rotating wheel 200. The arrangement of the measuring columns 300 and the design of the rotating wheel 200 can avoid the problem of inconvenient operation caused by the distance between the measuring heads 301 during blood vessel diameter measurement and avoid affecting the measurement accuracy. The design of the rotating wheel 200 makes it very easy to select the measuring column 300 for measurement. Medical workers can, according to needs, simply push the rotating wheel 200 with the thumb to rotate the rotating wheel 200, quickly switch the appropriate measuring column 300 to the appropriate position, complete the selection and measurement operations of the measuring column 300, without the need to perform measurement angle adjustment operations like traditional measuring tools, reducing the operation steps, lowering the operation difficulty, making the measurement operation more smooth and convenient, and greatly improving the efficiency of the surgical operation.

[0042] In this embodiment, the pipe diameter measuring ruler has at least seven measuring posts 300 with different diameter specifications, which are evenly distributed on the circumference of the rotating wheel 200, covering most of the blood vessel diameter ranges and can accurately match blood vessels of various thicknesses. Compared with traditional measuring tools, it eliminates the problem of difficult measurement in narrow spaces that may occur due to the close spacing of the measuring heads 301, effectively improves the measurement accuracy, ensures that medical workers can obtain more accurate blood vessel diameter data, and provides a reliable basis for selecting a suitable blood vessel anastomosis device. Wear the pipe diameter measuring ruler on the index finger and push the rotating wheel 200 with the thumb, which can make the rotating wheel 200 and multiple measuring posts 300 rotate around the wearing bushing 100, so as to conveniently select a measuring post 300 with a suitable diameter specification. Exemplarily, the wearing bushing 100 can be specifically set as a bearing bush, and the bearing bush is processed and manufactured from a copper alloy with self-lubricating characteristics, which can ensure the smoothness and accuracy of the rotation of the rotating wheel 200.

[0043] Specifically, an installation groove 201 is formed on the inner side of the rotating wheel 200, and the inner diameter of the installation groove 201 is greater than or equal to the outer diameter of the wearing bushing 100, so that the wearing bushing 100 can be embedded in the installation groove 201. Preferably, there is a rotation gap between the inner diameter of the installation groove 201 and the outer diameter of the wearing bushing 100, which can satisfy the relative rotation of the rotating wheel 200 and the wearing bushing 100, avoid jamming and wear resistance, or a lubrication process can be set between the two to extend the service life of the structure and improve the rotation flexibility. One end of the wearing bushing 100 abuts against the bottom of the installation groove 201, and a first wearing through hole 202 is formed at the bottom of the installation groove 201. The inner diameter of the first wearing through hole 202 is greater than or equal to the inner diameter of the wearing bushing 100, and the first wearing through hole 202 does not affect the entry and exit of the finger inside the wearing bushing 100.

[0044] Optionally, the pipe diameter measuring ruler further includes a retaining ring 400, which is fixed to the top of the installation groove 201 and abuts against the wearing bushing 100. The retaining ring 400 is arranged at one end of the rotating wheel 200 and the wearing bushing 100, playing a role of fixing and limiting, preventing relative displacement of the rotating wheel 200 and the wearing bushing 100 in the axial direction. The retaining ring 400 can prevent the wearing bushing 100 from slipping out of the installation groove 201 and stabilize the assembly structure of the pipe diameter measuring ruler; the retaining ring 400 is provided with a second wearing through hole 401, and the inner diameter of the second wearing through hole 401 is greater than or equal to the inner diameter of the wearing bushing 100. The first wearing through hole 202 does not affect the entry and exit of the finger inside the wearing bushing 100.

[0045] As Figures 3 to 5 shown, the opening direction of the installation groove 201 is opposite to the extending direction of the finger, and the retaining ring 400 is detachably connected to one end of the rotating wheel 200 by screws, which is convenient for disassembly, assembly and maintenance.

[0046] In another implementation of this embodiment, the wearing bushing 100 can also be set as a bearing 110. The inner ring of the bearing 110 is used to sleeved on the outer side of the finger, and the outer ring of the bearing 110 is fixed to the rotating wheel 200 so that the rotating wheel 200 is coaxially rotatably connected to the inner ring of the bearing 110. Exemplarily, the bearing 110 can adopt a fully sealed needle bearing according to actual needs, which can further reduce the friction when the rotating wheel 200 rotates, improve the operation flexibility, and is also easier to clean and sterilize.

[0047] As Figure 4 and Figure 5 shown, the slotting direction of the installation on is the same as the extending direction of the finger. The retaining ring 400 is snap-fitted and embedded at the top opening of the installation slot 201, reducing the use of connecting parts, further reducing the assembly thickness of the pipe diameter measuring ruler, and improving the wearing comfort.

[0048] It can be understood that the measuring column 300 is detachably connected to the rotating wheel 200. With the detachable design of the rotating wheel 200 and the wearing bushing 100, the overall structure of the pipe diameter measuring ruler is simple and can be disassembled into individual parts for sterilization treatment to ensure more convenient and thorough achievement of the sterile standard. At the same time, when using the pipe diameter measuring ruler to measure the blood vessel diameter, a complete set of replaceable measuring columns 300 is also equipped so that when the measuring column 300 is damaged due to special circumstances or needs to be replaced due to wear, it can be replaced in time. If one of the measuring columns 300 is damaged, only the damaged measuring column 300 needs to be replaced separately, improving the interchangeability of the pipe diameter measuring ruler and reducing the maintenance cost.

[0049] Specifically, the measuring column 300 includes a connecting portion 303, an identification portion 302, and a measuring head 301 that are connected in sequence. The rotating wheel 200 is provided with a plurality of threaded grooves, and the connecting portion 303 is threadedly connected to the rotating wheel 200. After the operation, medical staff can easily disassemble the measuring column 300 from the rotating wheel 200 and perform professional sterilization treatment on these components separately. This ensures that every part of the measuring ruler can meet strict sterile standards and maximally reduces the risk of surgical infection.

[0050] Optionally, the pipe diameter measuring ruler further includes plugs. There are a plurality of plugs. If the range of blood vessel diameter specifications to be measured during the operation is small, a certain number of measuring columns 300 can be selectively installed, and it is not necessary to install all the inappropriate measuring columns 300 on the threaded grooves, so that the distance between the measuring columns 300 installed on the rotating wheel 200 is wider, which is convenient for operation. Some of the threaded grooves are in one-to-one docking with the connecting portion 303 of the measuring column 300, and the remaining threaded grooves are in one-to-one docking with the plugs, which can block the threaded grooves and prevent body fluids from entering the threaded grooves during the measurement process and being difficult to clean.

[0051] Further, the identification parts 302 correspond to the measuring heads 301 one by one. The outer diameter values of the measuring heads 301 are displayed on the identification parts 302, which can facilitate medical workers to visually correspond to the diameters of the measuring columns 300 and quickly compare the diameters of the measured blood vessels. The identification parts 302 are set as multi-sided prisms, and the outer diameter values of the measuring heads 301 are displayed on each side of the multi-sided prism. No matter what angular position the rotating wheel 200 rotates to, medical workers can immediately observe the data of the measuring column 300 without having to change the operating hand or the angle of the rotating wheel 200 due to difficulty in confirming and reading the measured value.

[0052] In order to use the blood vessel diameter measuring ruler more stably, an anti-slip part is provided on the inner side of the wearing sleeve 100. The anti-slip part can be specifically designed as a layer of silicone sticker, which can not only prevent the blood vessel diameter measuring ruler from falling off the finger, but also improve the wearing comfort. Exemplarily, anti-slip patterns or a matte layer can also be provided on the inner side of the wearing sleeve 100, which can also achieve the anti-slip effect and is convenient for cleaning.

[0053] In this embodiment, a dial stop protrusion 203 is provided on the outer side of the rotating wheel 200. Medical workers can easily apply force to rotate the rotating wheel 200 by contacting the dial stop protrusion 203 with the thumb, and can also stop the rotation of the rotating wheel 200 by limiting with the thumb and the dial stop protrusion 203.

[0054] The present invention also discloses a method for measuring the blood vessel diameter using the blood vessel diameter measuring ruler. Before performing blood vessel anastomosis surgery, prepare the blood vessel diameter measuring ruler. The specific operation steps are as follows: Before the measurement before the surgery, medical workers clean, disinfect, and sterilize the blood vessel diameter measuring ruler, and ensure that all components are intact and firmly assembled. First, firmly wear the blood vessel diameter measuring ruler on the index finger, adjust the position for convenient operation and measurement. During the surgery, after the blood vessel to be measured is exposed, preliminarily observe and estimate the blood vessel diameter range to quickly find the corresponding measuring column 300 on the rotating wheel 200. For example, if it is preliminarily determined that the blood vessel diameter may be between 2 mm and 3 mm, then select the measuring column 300 with a diameter of 2.5 mm on the rotating wheel 200. Medical workers gently push the rotating wheel 200 with an appropriate force with the thumb. The rotating wheel 200 drives a plurality of the measuring columns 300 to rotate at a uniform speed. At the same time, medical workers' eyes can clearly observe the scale of the identification part 302 on the measuring column 300 under the illumination of the surgical lamp, and select the measuring column 300 expected to be close to the blood vessel diameter.

[0055] After finding a roughly matching measuring column 300, slowly move the selected measuring column 300 closer to the blood vessel to be measured, keep the relative position between the measuring column 300 and the blood vessel stable, and fine-tune the rotary wheel 200 again. By observing the relative position between the measuring column 300 and the blood vessel, align the measuring column 300 with the coaxial direction of the blood vessel. Emphasize the measurement method where the measuring column 300 is axially coincident with the blood vessel, avoiding measurement errors caused by angular deviations, further improving the measurement accuracy and reliability, and ensuring that the outer circumference of the measuring column 300 can coincide with the inner circumference of the blood vessel to obtain the most accurate measurement result. Arrange multiple measuring columns 300 in sequence along the circumferential direction of the rotary wheel 200 according to the size of their outer circumferences. If the selected measuring column 300 is smaller than the inner circumference of the blood vessel, it is necessary to replace it with a larger-sized measuring column 300. Turn the rotary wheel 200 in this rotation direction, select the measuring column 300 again, still keep the measuring column 300 in the coaxial direction with the blood vessel, and repeat the comparison until the measuring column 300 coincides with the inner circumference of the blood vessel; if the selected measuring column 300 is larger than the inner circumference of the blood vessel, it is necessary to replace it with a smaller-sized measuring column 300 and turn the rotary wheel 200 in the opposite direction, and so on, until the outer diameter of the measuring column 300 exactly matches the diameter of the blood vessel. At this time, the doctor can observe the scale on the currently selected measuring column 300 to select a blood vessel anastomosis device suitable for the blood vessel diameter. After completing one measurement, if it is necessary to measure the same blood vessel multiple times or measure the diameters of other blood vessels, the above steps can be repeated. To meet the requirements of high-precision measurement of blood vessel diameter and precise anastomosis of blood vessels, the specification difference between multiple sequentially arranged measuring columns 300 should be the same as the specification difference for selecting a suitable blood vessel anastomosis device during the operation to meet the rapid selection needs of blood vessel anastomosis devices in clinical practice.

[0056] After the operation, medical staff carefully disassemble the pipe diameter measuring ruler. In the order from outside to inside and from simple components to complex components, first remove the measuring column 300 from the rotary wheel 200, and then, if necessary, separate the rotary wheel 200 from the wearing bushing 100. Put the disassembled components into appropriate sterilization containers respectively, select an appropriate sterilization method, such as high-temperature high-pressure sterilization, ethylene oxide sterilization, etc., and perform sterilization treatment according to the corresponding sterilization operating procedures. After sterilization is completed, reassemble the pipe diameter measuring ruler in a sterile environment. After confirming that each component is correctly installed, firmly connected, and rotates flexibly without error, properly seal the pipe diameter measuring ruler in a sterile state for future use.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pipe diameter measuring ruler, characterized in that: include: A wearing sleeve (100), the wearing sleeve (100) being used to be sleeved around the periphery of a finger, the inner diameter of the wearing sleeve (100) being greater than or equal to the outer diameter of the wearing position of the finger; A rotating wheel (200), wherein the rotating wheel (200) is sleeved on the outside of the wearing sleeve (100), and the rotating wheel (200) is coaxially rotatably connected with the wearing sleeve (100); A measuring column (300), wherein a plurality of the measuring columns (300) are provided, the outer diameters of the measuring heads (301) of the plurality of the measuring columns (300) are all different, the plurality of the measuring columns (300) are arranged at intervals along the circumference of the rotating wheel (200), and the measuring column (300) is located at one end of the rotating wheel (200) close to the finger head, and the axial direction of the measuring column (300) is parallel to the axial direction of the rotating wheel (200).

2. The pipe diameter measuring ruler according to claim 1, characterized in that: A mounting groove (201) is provided on the inner side of the rotating wheel (200), and a rotation gap is provided between the inner diameter of the mounting groove (201) and the outer diameter of the wearing sleeve (100), so that the wearing sleeve (100) can be embedded in the mounting groove (201), one end of the wearing sleeve (100) is in contact with the bottom of the mounting groove (201), and a first wearing through hole (202) is provided at the bottom of the mounting groove (201), and the inner diameter of the first wearing through hole (202) is greater than or equal to the inner diameter of the wearing sleeve (100).

3. The pipe diameter measuring ruler according to claim 2, characterized in that: The pipe diameter measuring ruler also includes a retaining ring (400), the retaining ring (400) is fixed to the top of the mounting groove (201), and the retaining ring (400) is in contact with the wearing sleeve (100), and the retaining ring (400) is provided with a second wearing through hole (401), and the inner diameter of the second wearing through hole (401) is greater than or equal to the inner diameter of the wearing sleeve (100).

4. The pipe diameter measuring ruler according to claim 1, characterized in that: The measuring column (300) is detachably connected to the rotating wheel (200).

5. The pipe diameter measuring ruler according to claim 4, characterized in that: The measuring column (300) comprises a connecting portion (303), an identification portion (302) and the measuring head (301) which are connected in sequence, the connecting portion (303) is threadedly connected to the rotating wheel (200), the identification portion (302) corresponds to the measuring head (301) in a one-to-one manner, and the identification portion (302) displays the outer diameter value of the measuring head (301).

6. The pipe diameter measuring ruler according to claim 5, characterized in that: The identification portion (302) is configured as a multi-faceted prism, and each face of the multi-faceted prism displays the outer diameter value of the measuring head (301).

7. The pipe diameter measuring ruler according to claim 5, characterized in that: The pipe diameter measuring ruler also includes a plug, and a plurality of the plugs are provided. The rotating wheel (200) is provided with a plurality of thread grooves, some of the thread grooves are connected one-to-one with the connecting portion (303), and the remaining thread grooves are connected one-to-one with the plugs.

8. The pipe diameter measuring ruler according to claim 1, characterized in that: An anti-slip portion is provided on the inner side of the wearing sleeve (100).

9. The pipe diameter measuring ruler according to claim 1, characterized in that: The wearing sleeve (100) is configured as a bearing (110), the inner ring of the bearing (110) is used to be sleeved on the outside of the finger, and the outer ring of the bearing (110) is fixed to the rotating wheel (200) so that the rotating wheel (200) and the inner ring of the bearing (110) are coaxially rotatably connected.

10. The pipe diameter measuring ruler according to any one of claims 1 to 9, characterized in that: A stop protrusion (203) is provided on the outer side of the rotating wheel (200).

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