Pipe diameter measuring scale

Abstract

The invention relates to the technical field of medical apparatus and instruments, and discloses a pipe diameter measuring scale which is characterized in that a wearing shaft sleeve is directly sleeved on a finger, a measuring tool does not need to be held, and the operation space is saved; the rotating wheel is coaxially and rotationally arranged on the outer side of the wearing shaft sleeve in a sleeving mode, and the wearing shaft sleeve is located in the center of the rotating wheel and provides stable rotating support for the rotating wheel; the outer diameters of the measuring heads of the plurality of measuring columns are different, so that the high-precision measuring requirements of different blood vessels are met, and the application range of the pipe diameter measuring scale is expanded; the measuring columns are arranged at intervals in the circumferential direction of the rotating wheel, the measuring columns are located on the end face, close to the finger, of the rotating wheel, the axial direction of the measuring columns is parallel to the axial direction of the rotating wheel, and due to the arrangement of the measuring columns and the design of the rotating wheel, the problem that operation is inconvenient due to the distance between the measuring heads can be solved; the proper measuring column can be quickly switched to a proper position only by simply pushing the rotating wheel, the selection of the measuring column is completed, the measuring operation is smoother and more convenient, and the efficiency of surgical operation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, and in particular to a pipe diameter measuring ruler. Background Art

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

[0003] However, the traditional vascular diameter measurement tools currently used in clinical practice have some defects, such as: inconvenient operation. Most of the measurement tools need to be operated by medical workers. In a limited operating space, especially when performing delicate vascular anastomosis, handheld measurement tools may interfere with surgical operations and increase the difficulty of the operation; the measurement accuracy is limited. The spacing between the measuring heads of some measuring tools is not reasonably designed. When measuring some blood vessels with smaller diameters, due to the limited measurement space, the measuring tool cannot be placed at a suitable angle for measuring the blood vessel diameter, which affects the accuracy of the measurement results and makes it difficult to meet the requirements of vascular anastomosis for high-precision measurement.

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

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

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

[0007] Pipe diameter measuring tape, including:

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

[0009] A rotating wheel, the rotating wheel sleeve is arranged on the outside of the wearing sleeve, and the rotating wheel is coaxially rotatably connected with the wearing sleeve;

[0010] A measuring column, wherein a plurality of measuring columns are provided, and the outer diameters of the measuring heads of the plurality of measuring columns are all different. The plurality of measuring columns are arranged at intervals along the circumference of the rotating wheel, and the measuring column is located at one end of the rotating wheel close to the finger head, and the axial direction of the measuring column 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 comprises a wearing sleeve, a rotating wheel and a measuring column. The wearing sleeve is used to be sleeved on the periphery of a finger, and the inner diameter of the wearing sleeve is greater than or equal to the outer diameter of the wearing position of the finger. The wearable design allows the pipe diameter measuring ruler to be selectively worn on the index finger. During a surgical procedure such as vascular anastomosis, which requires delicate operation and has extremely limited operating space, the doctor does not need to hold an additional measuring tool, thus saving operating space. The rotating wheel is sleeved on the outside of the wearing sleeve, and the rotating wheel is coaxially connected to the wearing sleeve for rotation. The wearing sleeve is located at the center of the rotating wheel to provide a stable rotating support for the rotating wheel. The measuring column is provided with a plurality of measuring columns. The outer diameters of the measuring heads are all different to meet the high-precision measurement requirements of different blood vessels and expand the application range of the tube diameter measuring ruler; multiple measuring columns are arranged at intervals along the circumference of the rotating wheel and can change positions as the rotating wheel rotates, and the measuring columns are located on an end face 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. The arrangement of the measuring columns and the design of the rotating wheel can avoid operational difficulties caused by the spacing between the measuring heads; only a simple push of the rotating wheel is required to quickly switch the appropriate measuring column to the appropriate position, completing the selection and measurement operations of the measuring columns, making the measurement operations smoother and more convenient, and greatly improving the efficiency of surgical operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a pipe diameter measuring ruler provided by a specific embodiment of the present invention from a first viewing angle;

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

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

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

[0026] Figure 5 is a structural schematic diagram of a pipe diameter measuring ruler from a first viewing angle of another embodiment provided in a specific embodiment of the present invention;

[0027] Figure 6 is a structural schematic diagram of a pipe diameter measuring ruler from a second viewing angle of another embodiment provided in a specific embodiment of the present invention;

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

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

[0030] Fig. 9 It is a schematic diagram of the structure of a measuring column of a pipe diameter measuring ruler provided in a specific embodiment of the present invention.

[0031] In the figure:

[0032] 100. Wear the bushing; 110. Bearing;

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

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

[0035] 400, retaining ring; 401, second wearing through hole. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, 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 specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] like Figures 1 to 9 As shown, the present invention discloses a pipe diameter measuring ruler, comprising a wearing sleeve 100, a rotating wheel 200 and a measuring column 300. The wearing sleeve 100 is used to be sleeved on the periphery of a finger, and the inner diameter of the wearing sleeve 100 is greater than or equal to the outer diameter of the wearing position of the finger. The wearable design allows the pipe diameter measuring ruler to be selectively worn on the index finger. During a surgical procedure such as vascular anastomosis, which requires delicate operation and extremely limited operating space, the doctor does not need to hold an additional measuring tool, thereby saving operating space.

[0041] The rotating wheel 200 is sleeved on the outside of the wearing sleeve 100, and the rotating wheel 200 is coaxially connected with the wearing sleeve 100, and the wearing sleeve 100 is located at the center of the rotating wheel 200, providing stable rotation support for the rotating wheel 200; there are multiple measuring columns 300, and the outer diameters of the measuring heads 301 of the multiple measuring columns 300 are different. The diameter of each measuring column 300 is accurately set according to the common blood vessel diameter range in clinical practice, which can meet the high-precision measurement requirements of different blood vessels and expand the application range of the pipe diameter measuring ruler. The multiple measuring columns 300 are arranged at intervals along the circumference of the rotating wheel 200, and can change positions as the rotating wheel 200 rotates. The measuring column 300 is located on an end face 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. The arrangement of the measuring columns 300 and the design of the rotating wheel 200 can avoid the problem of inconvenience in operation caused by the spacing problem of the measuring heads 301 when measuring the blood vessel diameter, and avoid affecting the measurement accuracy. The design of the rotating wheel 200 makes it easy to select the measuring column 300 for measurement. Medical workers can rotate the rotating wheel 200 by simply pushing the rotating wheel 200 with their thumb as needed, quickly switch the appropriate measuring column 300 to the appropriate position, and complete the selection and measurement operation of the measuring column 300. There is no need to adjust the measuring angle like traditional measuring tools, which reduces the operating steps and the difficulty of operation, making the measurement operation smoother and more convenient, and greatly improving the efficiency of surgical operations.

[0042] In this embodiment, the pipe diameter measuring ruler has at least 7 measuring columns 300 of different diameters, which are evenly distributed on the circumference of the rotating wheel 200, covering most of the blood vessel diameter range, and can accurately match blood vessels of various thicknesses; compared with traditional measuring tools, it eliminates the problem of difficulty in measuring in a narrow space due to the close spacing of the measuring heads 301, effectively improves the accuracy of the measurement, ensures that medical workers can obtain more accurate blood vessel diameter data, and provides a reliable basis for selecting a suitable vascular anastomosis device. Wearing the pipe diameter measuring ruler on the index finger and pushing the rotating wheel 200 with the thumb can make the rotating wheel 200 and multiple measuring columns 300 rotate around the wearing sleeve 100, so as to conveniently select the measuring column 300 of the appropriate diameter specification. Exemplarily, the wearing sleeve 100 can be specifically set as a bearing, and the bearing is made of a copper alloy with self-lubricating properties, which can ensure the smoothness and accuracy of the rotation of the rotating wheel 200.

[0043] Specifically, a mounting groove 201 is provided on the inner side of the rotating wheel 200, and the inner diameter of the mounting groove 201 is greater than or equal to the outer diameter of the wearing sleeve 100, so that the wearing sleeve 100 can be embedded in the mounting groove 201. Preferably, a rotation gap is provided between the inner diameter of the mounting groove 201 and the outer diameter of the wearing sleeve 100, which can meet the relative rotation of the rotating wheel 200 and the wearing sleeve 100, avoid obstruction and wear resistance, or a lubrication process can be provided between the two to extend the service life of the structure and improve the rotation flexibility. 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, and the first wearing through hole 202 does not affect the entry and exit of the fingers inside the wearing sleeve 100.

[0044] Optionally, the pipe diameter measuring ruler also includes a retaining ring 400, which is fixed at the top of the mounting groove 201, and the retaining ring 400 is in contact with the wearing sleeve 100. The retaining ring 400 is arranged at one end of the rotating wheel 200 and the wearing sleeve 100, and plays a role of fixing and limiting, preventing the rotating wheel 200 and the wearing sleeve 100 from relative displacement in the axial direction. The retaining ring 400 can prevent the wearing sleeve 100 from escaping from the mounting groove 201, thereby stabilizing 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 sleeve 100, and the first wearing through hole 202 does not affect the entry and exit of fingers inside the wearing sleeve 100.

[0045] like Figures 3 to 5 As shown in , the slotting direction of the installation slot 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 and maintenance.

[0046] In another implementation of this embodiment, the wearing sleeve 100 can also be set 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 is coaxially rotatably connected with the inner ring of the bearing 110. For example, 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 flexibility of operation, and is also easier to clean and sterilize.

[0047] like Figure 4 and Figure 5 As shown in , the slotting direction of the installation is the same as the extending direction of the finger, and the retaining ring 400 is clamped and embedded in the top opening of the installation slot 201, which reduces the use of connecting parts, further reduces the assembly thickness of the pipe diameter measuring ruler, and improves wearing comfort.

[0048] It is understandable that the measuring column 300 is detachably connected to the rotating wheel 200, and the detachable design of the rotating wheel 200 and the wearing sleeve 100 makes the overall structural design of the pipe diameter measuring ruler simple, and can be disassembled into individual parts for sterilization to ensure that the sterility standard is met more conveniently and thoroughly. At the same time, when using the pipe diameter measuring ruler to measure the diameter of the blood vessel, it is also equipped with a complete set of replaceable measuring columns 300, so that the measuring column 300 can be replaced in time when it is damaged due to special circumstances or needs to be replaced due to wear. If one of the measuring columns 300 is damaged, only the damaged measuring column 300 needs to be replaced separately, which improves the interchangeability of the pipe diameter measuring ruler and reduces maintenance costs.

[0049] Specifically, the measuring column 300 includes a connecting portion 303, a marking portion 302 and a measuring head 301 connected in sequence, the rotating wheel 200 is provided with a plurality of thread grooves, the connecting portion 303 is threadedly connected to the rotating wheel 200, and after the operation, the medical worker can easily remove the measuring column 300 from the rotating wheel 200 and perform professional sterilization treatment on these components respectively. This ensures that each part of the measuring ruler can meet strict sterility standards and minimize the risk of surgical infection.

[0050] Optionally, the pipe diameter measuring ruler also includes a plug, and a plurality of plugs are provided. If the specification range of the blood vessel diameter to be measured during surgery is small, a certain number of measuring columns 300 can be selectively installed, and it is not necessary to install all 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 and the operation is convenient. Some threaded grooves are connected one by one with the connecting parts 303 of the measuring columns 300, and the remaining threaded grooves are connected one by one with the plugs, which can block the threaded grooves and prevent body fluids from entering the threaded grooves and being difficult to clean during the measurement process.

[0051] Furthermore, the marking part 302 corresponds to the measuring head 301 one by one, and the outer diameter value of the measuring head 301 is displayed on the marking part 302, which can facilitate medical workers to intuitively correspond to the diameter of the measuring column 300 and quickly compare and measure the diameter of the blood vessel. The marking part 302 is set as a multi-faceted prism, and each face of the multi-faceted prism displays the outer diameter value of the measuring head 301. Regardless of the angle position of the rotating wheel 200, the medical worker can immediately observe the data of the measuring column 300, without having to change the angle of the operating hand or the rotating wheel 200 due to difficulty in confirming the reading of the measured value.

[0052] In order to use the pipe diameter measuring ruler more stably, an anti-skid portion is provided on the inner side of the wearing sleeve 100. The anti-skid portion can be specifically designed as a layer of silicone sticker, which can prevent the pipe diameter measuring ruler from falling off the finger and improve the wearing comfort. For example, an anti-skid pattern or frosted layer can also be provided on the inner side of the wearing sleeve 100, which can also achieve an anti-skid effect and is easy to clean.

[0053] In this embodiment, a stop protrusion 203 is provided on the outer side of the rotating wheel 200. Medical workers can use their thumb to touch the stop protrusion 203 to conveniently apply force to rotate the rotating wheel 200, or they can use their thumb and the stop protrusion 203 to limit the rotation of the rotating wheel 200.

[0054] The present invention also discloses a method for measuring the diameter of a blood vessel using a caliper ruler. Before performing a vascular anastomosis, a caliper ruler is prepared. The specific operation steps are as follows: before the operation, the medical worker cleans, disinfects and sterilizes the caliper ruler, and ensures that all parts are intact and firmly assembled. First, the caliper ruler is firmly worn on the index finger, and the position is adjusted to facilitate operation and measurement. During the operation, after the blood vessel to be measured is exposed, the range of the blood vessel diameter is preliminarily observed and estimated, so as to quickly find the corresponding measuring column 300 on the rotating wheel 200. For example, if it is preliminarily judged that the blood vessel diameter may be between 2 mm and 3 mm, then a measuring column 300 with a diameter of 2.5 mm is selected on the rotating wheel 200. The medical worker gently pushes the rotating wheel 200 with an appropriate force with the thumb, and the rotating wheel 200 drives a plurality of measuring columns 300 therein to rotate at a uniform speed. At the same time, the medical worker's eyes can clearly observe the scale of the identification part 302 on the measuring column 300 under the illumination of the surgical light, and select the measuring column 300 that is 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 close to the blood vessel to be measured, keep the relative position of the measuring column 300 and the blood vessel stable, and fine-tune the rotating wheel 200 again. By observing the relative position between the measuring column 300 and the blood vessel, the measuring column 300 is located in the coaxial direction with the blood vessel, emphasizing that the measuring column 300 and the blood vessel are measured in an axially overlapping manner, avoiding measurement errors caused by angle deviations, further improving the accuracy and reliability of the measurement, and ensuring that the outer periphery of the measuring column 300 can overlap with the inner periphery of the blood vessel to obtain the most accurate measurement results. Arrange multiple measuring columns 300 in order along the circumference of the rotating wheel 200 according to the size of their outer circumference specifications. If the selected measuring column 300 is smaller than the inner circumference of the blood vessel, it is necessary to replace and select a measuring column 300 of a larger specification, turn the rotating wheel 200 in this rotation direction, select the measuring column 300 again, and 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 and select a measuring column 300 of a smaller specification, turn the rotating wheel 200 in the opposite direction, and so on, until the outer diameter of the measuring column 300 just matches the blood vessel diameter. At this time, the doctor can select a vascular anastomosis device with a suitable blood vessel diameter by observing the scale on the currently selected measuring column 300. After completing a measurement, if it is necessary to measure the same blood vessel multiple times or measure the diameter of other blood vessels, the above steps can be repeated. In order to meet the requirements of high-precision measurement of blood vessel diameter and precise anastomosis of blood vessels, the specification difference between the multiple measuring columns 300 arranged in sequence should be the specification difference of the appropriate vascular anastomosis device selected during the operation, so as to meet the clinical demand for rapid selection of vascular anastomosis devices.

[0056] After the operation, the medical worker carefully disassembles the pipe diameter measuring ruler, and first removes the measuring column 300 from the rotating wheel 200 in the order from outside to inside and from simple parts to complex parts. Then, the rotating wheel 200 can also be separated from the wearing sleeve 100 as needed. Put the disassembled parts into suitable sterilization containers respectively, select appropriate sterilization methods, such as high temperature and high pressure sterilization, ethylene oxide sterilization, etc., and sterilize them according to the corresponding sterilization operation procedures. After sterilization, reassemble the pipe diameter measuring ruler in a sterile environment, and after confirming that each part is installed correctly, connected firmly and rotates flexibly, the pipe diameter measuring ruler is properly sterilized and sealed for next use.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should 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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