Multifunctional tunnel expansion measuring ruler

Abstract

The present invention discloses a multifunctional tunnel skin expansion measuring ruler; it includes a flat ruler body for expanding a sac containing an infusion port seat and detecting the size of the corresponding sac and a tunnel needle for pulling a PICC internal catheter; the flat ruler body is connected to the tunnel needle as a whole; the length of the flat ruler body is slightly greater than 3.0 cm, the width is 1.0 cm, the thickness is 1.0 mm, the upper end is formed into a flat arc-shaped structure, and the outer end surface is provided with a measuring scale line A with a unit length of 2.0 mm along its length direction; the outer wall of the tunnel needle is provided with a measuring scale line B with a unit length of 1.0 cm along its length direction. Effect: the flat ruler body provided can be used to expand the sac containing an infusion port seat and detect the size of the corresponding sac, and the tunnel needle provided can be used to pull the PICC internal catheter. By comparing the scale on it, the depth of its insertion into the subcutaneous part of the patient's arm can be controlled in real time, so that the insertion depth is well controlled, and even if it is inserted off-center and its front end deviates from the insertion point of the PICC internal catheter, it can be discovered and corrected in time, so that the application is highly practical.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, in particular to a multifunctional tunnel skin expansion measuring ruler. Background Art

[0002] In existing major hospitals, for patients with PICC catheters, when performing PICC catheterization, first, an insertion point needs to be opened in the patient's arm, the PICC internal catheter is inserted into the patient's vein, and the corresponding PICC internal catheter outer end is left at the corresponding insertion point, and then the patient's arm skin is expanded at a position about 10.0 cm adjacent to the corresponding insertion point to construct a pouch containing an infusion port, and after visually inspecting that the inner diameter of the corresponding pouch is of appropriate size, a tunnel needle is used to insert the constructed pouch, and then inserted along the subcutaneous part of the patient's arm to a certain depth inside the outer end of the PICC internal catheter at the corresponding insertion point, and then the tunnel needle is withdrawn, and the corresponding PICC internal catheter outer end is brought into the constructed pouch along the subcutaneous part of the patient's arm, so as to be connected to the infusion port required to be subsequently loaded into the corresponding pouch.

[0003] Although the above operation is widely used, it still has certain defects and shortcomings.

[0004] Specifically, on the one hand, when using a knife to expand the skin of the patient's arm to construct a bag for the infusion port, there is an inaccuracy problem in visual inspection after expansion. If the inner diameter of the initially constructed bag is too small, the infusion port cannot be completely placed therein, so that the infusion port needs to be repeatedly tried and the corresponding bag needs to be repeatedly expanded with a knife until its inner diameter is of appropriate size. If the inner diameter of the initially constructed bag is too large, the infusion port will not be stable after being placed therein, and it will be easy to loosen and shift, resulting in poor subsequent use effect. In this way, the construction of the bag is cumbersome, time-consuming and labor-intensive. On the other hand, when the outer end of the PICC internal catheter is pulled along the subcutaneous part of the patient's arm into the constructed bag, the outer wall of the conventional tunnel needle is not set with a scale, making it difficult to control the depth of insertion into the subcutaneous part of the patient's arm in real time. When the insertion depth is not well controlled, it will be inserted off-center and the front end of the needle will deviate from the corresponding insertion point or pass the corresponding insertion point, so that the tunnel needle needs to be reinserted, which will also be time-consuming and labor-intensive.

[0005] Furthermore, based on the above, existing problems need to be solved. Summary of the invention

[0006] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a multifunctional tunnel expansion measuring ruler.

[0007] The technical solution adopted by the present invention to solve the existing technical problems is: a multifunctional tunnel skin expansion measuring ruler, including a flat ruler body for expanding a bag containing an infusion port seat and detecting the size of the corresponding bag and a tunnel needle for pulling a PICC internal catheter;

[0008] The lower end of the flat ruler body is connected to the upper end of the tunnel needle as a whole; the flat ruler body is formed into a flat square body structure, its length is slightly greater than 3.0 cm, its width is 1.0 cm, its thickness is 1.0 mm, and its upper end is formed into a flat arc structure, and its outer end surface is provided with a measuring scale line A with a unit length of 2.0 mm along its length direction;

[0009] The outer wall of the tunnel needle is provided with a measuring scale line B with a unit length of 1.0 cm along its length direction.

[0010] The above technical solution is further explained below:

[0011] Preferably, the starting scale on the measuring scale line A is 1.0 cm and is located at the upper end, and the vertical distance between the starting scale on the measuring scale line A and the upper end of the flat ruler body is 1.0 cm.

[0012] Preferably, the width of the lower end of the flat ruler gradually increases to be equal to the outer diameter of the tunnel needle, so as to smoothly transition with the upper end of the tunnel needle.

[0013] Preferably, a square-shaped hand-held block is protruding outward from the outer end surface of the flat ruler near its lower end; each end surface of the square-shaped hand-held block is recessed inward to form an anti-slip groove suitable for fingers to grip.

[0014] Preferably, the tunnel needle comprises a needle rod and a pulling needle head connected downwardly to the lower end of the needle rod; the length of the needle rod is L1, and the length of the pulling needle head is L2;

[0015] The L1 is ≥ 15.0 cm; the L2 is = 1.0 cm.

[0016] Preferably, the outer diameter of the needle rod is 6.0 mm, the outer diameter of the pulling needle gradually decreases from its upper end to its lower end, the outer diameter of the lower end of the pulling needle is 2.0 mm, and the lower end of the pulling needle is provided with a hemispherical protrusion protruding downward.

[0017] Preferably, the outer wall of the pulling needle is evenly provided with a plurality of circles of anti-dropping convex rings along its length direction.

[0018] Preferably, the outer diameter of each circle of the anti-slip convex ring gradually decreases from its upper end to its lower end, the thickness of each circle of the anti-slip convex ring is equal to 1.0mm, the difference between the inner and outer diameters of the upper end of each circle of the anti-slip convex ring is equal to 0.5mm, and the difference between the inner and outer diameters of the lower end of each circle of the anti-slip convex ring is equal to 0.0mm.

[0019] Preferably, the flat ruler body, the tunnel needle and the square-shaped hand-held block are integrally formed and made of titanium alloy, and the surfaces thereof are coated with a layer of iodine tincture coating.

[0020] The beneficial effects of the present invention are:

[0021] First, the multifunctional tunnel skin expansion measuring ruler provided by the present invention comprises a flat ruler body and a tunnel needle connected as one body. On the one hand, the flat ruler body can be used to expand the pouch of the infusion port and detect the size of the corresponding pouch. After using a cutter to slightly expand the skin of the patient's arm to pre-construct the pouch of the infusion port, the diameter of the pre-constructed pouch can be detected in real time by comparing the scale on the flat ruler body to see whether the diameter is compatible with the diameter of the infusion port of the required device. When the diameter is relatively small, the flat ruler body can be used to further cut the subcutaneous tissue of the patient's arm to expand the diameter of the pre-constructed pouch. In this process, the pouch can be constructed and detected at the same time until the measured pouch diameter is compatible with the diameter of the infusion port of the required device. In this way, the pouch can be constructed relatively accurately so as to fit the capacity of the infusion port of the required device, and the related operations are carried out while expanding and measuring, so that The one-time completion is good, which makes the operation simple, time-saving and labor-saving. Because the upper end of the flat ruler body is formed into a flat arc structure, when it is used to rotate in the pre-constructed pouch, the rotation is smooth, which makes the operation more time-saving. On the other hand, the tunnel needle is used to pull the PICC built-in catheter. By comparing the scale on it, the depth of its insertion under the skin of the patient's arm can be controlled in real time, so that the insertion depth is well controlled. Even if it is inserted off-center and its front end deviates from the insertion point of the PICC built-in catheter, it can be discovered and corrected in time, and its front end is not easy to cross the corresponding insertion point. In this way, the relevant operation is more time-saving, labor-saving and reliable. Therefore, the present application has the functions of expanding the pouch containing the infusion port, detecting the diameter of the pouch and detecting the subcutaneous insertion depth of the tunnel needle so as to better and faster pull the PICC built-in catheter, which makes it highly practical, multi-purpose and comprehensive, so that the use effect is significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the multifunctional tunnel expansion measuring ruler of the present invention in the first embodiment;

[0023] Figure 2 is a schematic diagram of the overall structure in which the flat ruler body is connected to the square-shaped hand-held block in the first embodiment;

[0024] Figure 3 is a schematic diagram of the overall structure of the tunnel needle in Example 1;

[0025] Figure 4yes Figure 3 , an enlarged view of the pulling needle;

[0026] Figure 5 yes Figure 3 , a longitudinal cross-sectional view of the pulling needle;

[0027] Figure 6 This is a schematic diagram of the overall structure of the multifunctional tunnel expansion measuring ruler of the present invention in the second embodiment;

[0028] Figure 7 yes Figure 6 , a partial enlarged view of the lower end of the needle shaft of the tunnel needle connected to the pulling needle head;

[0029] Figure 8 It is an exploded view of the multifunctional tunnel expansion measuring ruler of the present invention in the third embodiment;

[0030] Fig. 9 It is a partial enlarged view of the connection between the lower end of the needle shaft of the tunnel needle and the pulling needle head when the open-circuit convex ring is fixed to the outside of the lower end of the needle shaft in the third embodiment;

[0031] Fig.10 It is a schematic diagram of the overall structure of the multifunctional tunnel expansion measuring ruler of the present invention in the fourth embodiment;

[0032] Fig.11 This is an enlarged view of the anti-dropout member provided on the outside of the pulling needle in the fourth embodiment;

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0034] Figure Number:

[0035] Multifunctional tunnel expansion measuring ruler 1000;

[0036] Flat ruler body 10;

[0037] Flat arc-shaped structure 101; measuring scale line A102;

[0038] Tunnel needle 20;

[0039] Measuring scale line B21; needle rod 201; open circuit convex ring 2011; arc-shaped transition part 20111; external thread 2012; pulling needle head 202; hemispherical protrusion 2021; anti-drop convex ring 2022;

[0040] A square-shaped hand-held block 30;

[0041] Anti-slip groove 301;

[0042] Anti-slip member 40;

[0043] Fixed ring 401; pressing spring piece 402; anti-drop spring piece 403; DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to more clearly and intuitively understand the inventive essence of the present invention.

[0045] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown;

[0046] The multifunctional tunnel skin expansion measuring ruler 1000 provided by the present invention comprises a flat ruler body 10 for expanding a pouch containing an infusion port and detecting the size of the corresponding pouch and a tunnel needle 20 for pulling a PICC internal catheter;

[0047] The lower end of the flat ruler body 10 is connected to the upper end of the tunnel needle 20 as a whole; the flat ruler body 10 is formed into a flat square body structure, with a length slightly greater than 3.0 cm, a width of 1.0 cm, a thickness of 1.0 mm, and an upper end thereof is formed into a flat arc-shaped structure 101, and a measuring scale line A102 with a unit length of 2.0 mm is provided on its outer end surface along its length direction;

[0048] The outer wall of the tunnel needle 20 is provided with a measuring scale line B21 with a unit length of 1.0 cm along its length direction.

[0049] Based on the above, it is clear that when the present application is implemented, it is mainly used as a multifunctional tunnel expansion measuring ruler 1000.

[0050] The multifunctional tunnel skin expansion measuring ruler 1000 provided by the present invention, when implemented, comprises a flat ruler body 10 and a tunnel needle 20 connected as one body.

[0051] On the one hand, the flat ruler 10 can be used to expand the pouch of the infusion port and detect the size of the corresponding pouch. After using a knife to slightly expand the skin of the patient's arm to pre-construct the pouch of the infusion port, the diameter of the pre-constructed pouch can be detected in real time by comparing the scale on the flat ruler 10 to see whether the diameter is compatible with the diameter of the infusion port of the required device. When the diameter is relatively small, the flat ruler 10 can be used to further cut the subcutaneous tissue of the patient's arm to expand the diameter of the pre-constructed pouch. During the process, the bag can be constructed and detected at the same time until the measured diameter of the bag matches the diameter of the infusion port seat of the required device. In this way, the bag can be constructed relatively accurately so as to just fit the accommodation of the infusion port seat of the required device, and the related operations are carried out while expanding and measuring, so that it can be completed in one go, and the operation is simple and time-saving and labor-saving. Because the upper end of the flat ruler 10 is formed into a flat arc-shaped structure 101, when it is used to rotate in the pre-constructed bag, the rotation is smooth, which makes the operation more time-saving.

[0052] On the other hand, the tunnel needle 20 is used to pull the PICC internal catheter. By comparing the scale on it, the depth of its insertion into the subcutaneous tissue of the patient's arm can be controlled in real time, so that the insertion depth can be well controlled. Even if it is inserted off-center and the front end deviates from the insertion point of the PICC internal catheter, it can be discovered and corrected in time, and the front end is not likely to cross the corresponding insertion point. In this way, the relevant operations are more time-saving, labor-saving and reliable.

[0053] Therefore, the present application has the functions of expanding the pouch containing the infusion port, detecting the diameter of the pouch, and detecting the subcutaneous insertion depth of the tunnel needle 20 so as to better and more quickly pull the PICC built-in catheter, making it highly practical, multi-functional, and comprehensive, making the use effect significant.

[0054] Preferably, in the present technical solution, the starting scale mark on the measuring scale line A102 is 1.0 cm and is located at the upper end, and the vertical distance between the starting scale mark on the measuring scale line A102 and the upper end of the flat ruler body 10 is 1.0 cm.

[0055] Thus, in actual use, when the flat ruler 10 is used to detect the diameter of the cystic bag, the flat arc-shaped structure 101 at the upper end is located at the innermost part of the cystic bag. By comparing with the corresponding scale, medical staff can quickly measure the size of the cystic bag to be detected.

[0056] Moreover, in the present technical solution, the width of the lower end of the flat ruler 10 gradually increases to be equal to the outer diameter of the tunnel needle 20, so as to smoothly transition with the upper end of the tunnel needle 20, making the connection between them beautiful and delicate.

[0057] Furthermore, in the present technical solution, a square-shaped hand-held block 30 is protruding outward from the outer end surface of the flat ruler body 10 near its lower end;

[0058] Therefore, when the medical staff holds the square-shaped hand-held block 30, it is easy to manipulate the flat ruler 10 or the tunnel needle 20, so that the present application will not cause unstable holding due to the very delicate hand-held flat ruler 10 and the tunnel needle 20.

[0059] Furthermore, since each end surface of the square-shaped hand-held block 30 is recessed inward to form an anti-slip groove 301 suitable for fingers to grip, for medical staff, no matter how they hold the square-shaped hand-held block 30, their fingers can grip into a certain anti-slip groove 301, so that when they hold the present application, the anti-slip property is good and the hand grip is more stable.

[0060] In addition, in a specific implementation, the tunnel needle 20 includes a needle rod 201 and a pulling needle head 202 connected downwardly to the lower end of the needle rod 201; the length of the needle rod 201 is L1, and the length of the pulling needle head 202 is L2;

[0061] The L1 is ≥ 15.0 cm; the L2 is = 1.0 cm.

[0062] Thus, it can be clearly seen that the needle rod 201 is relatively long, making it more adaptable to use.

[0063] Again, in a specific implementation, the outer diameter of the needle rod 201 is 6.0 mm, the outer diameter of the pulling needle 202 gradually decreases from its upper end to its lower end, the outer diameter of the lower end of the pulling needle 202 is 2.0 mm, and the lower end of the pulling needle 202 is provided with a hemispherical protrusion 2021 protruding downward.

[0064] From the above, it can be clearly seen that:

[0065] On the one hand, the outer diameter of the pulling needle 202 gradually decreases from its upper end to its lower end, so that it can be adapted to be inserted into PICC catheters with different inner diameters, making it versatile.

[0066] On the other hand, the hemispherical protrusion 2021 at the front end has good roundness and smoothness, making it easy to slide into the outer end of the PICC built-in catheter, and is not easy to damage the PICC built-in catheter, nor is it easy to stab the hands of medical staff, making it safe and reliable to use.

[0067] It should be added that, in a specific implementation, the outer wall of the pulling needle 202 is evenly provided with a plurality of circles of anti-dropping convex rings 2022 along its length direction.

[0068] In this way, when a certain anti-slip convex ring 2022 is inserted into the outer end of the PICC internal catheter, it can play a certain anti-slip role, so that when the tunnel needle 20 is used to pull the PICC internal catheter, it has good anti-slip performance.

[0069] As a preferred solution, in this embodiment, the outer diameter of each circle of the anti-slip convex ring 2022 gradually decreases from its upper end to its lower end, the thickness of each circle of the anti-slip convex ring 2022 is equal to 1.0 mm, the difference between the inner and outer diameters of the upper end of each circle of the anti-slip convex ring 2022 is equal to 0.5 mm, and the difference between the inner and outer diameters of the lower end of each circle of the anti-slip convex ring 2022 is equal to 0.0 mm.

[0070] In this way, it can be clearly seen that the outer diameter of each circle of the anti-dropout convex ring 2022 gradually decreases from its upper end to its lower end, that is, the outer diameter of its lower insertion end is relatively small, so that when it follows the pulling needle 202 to be inserted into the outer end of the PICC internal catheter, the insertion guidance and insertion smoothness are good.

[0071] It should be further added that, in a specific implementation, the flat ruler body 10, the tunnel needle 20 and the square hand-held block 30 are integrally formed and made of titanium alloy, so that the texture is hard and firm, the service life is long, and it can be repeatedly used after cleaning and disinfection, and the surface is coated with a layer of iodine tincture coating, so that the present invention also has antibacterial and bactericidal effects, so as to avoid bringing bacteria to the subcutaneous tissue of the patient's arm skin, so as to avoid inflammation of the subcutaneous tissue of the arm skin due to bacterial infection.

[0072] It is further necessary to add that in the second embodiment, Figure 6 and Figure 7 As shown, the outer wall of the lower end of the needle rod 201 of the present application is provided with a circle of open-circuit convex ring 2011 integrally formed therewith for propping up the subcutaneous tissue of the patient's arm, and both upper and lower ends of the open-circuit convex ring 2011 are provided with arc-shaped transition parts that smoothly transition to the outer wall of the needle rod 201, and the outer diameter of the open-circuit convex ring 2011 is slightly larger than the outer diameter of the PICC internal catheter;

[0073] In this way, when the front end pulling needle 202 of the tunnel needle 20 is inserted into the subcutaneous tissue of the patient's skin, the arc-shaped transition portion at the lower end can play a certain smoothing role, so that it does not affect the synchronous insertion of the needle rod 201. After the pulling needle 202 is inserted tightly into the outer end of the PICC internal catheter, when the tunnel needle 20 is pulled back, the arc-shaped transition portion at the upper end can play a certain smoothing role, so that the pull-back resistance of the needle rod 201 is small. At the same time, the open-circuit convex ring 2011 can play a certain role in stretching the subcutaneous tissue of the patient's arm, so that during the pull-back process, the end of the constructed traction channel close to the outer end of the PICC internal catheter is stretched, so that the resistance of the subcutaneous tissue of the patient's arm before and after the stretched position to the outer end of the PICC internal catheter can be reduced, making it more difficult for the outer end of the PICC internal catheter to separate from the pulling needle 202, so that the use of this application is more effective.

[0074] In Example 3, combined with Figure 8 and Fig. 9 As shown, the outer wall of the lower end of the needle rod 201 of the present application is provided with an open-circuit convex ring 2011 for propping up the subcutaneous tissue of the patient's arm, and the upper and lower ends of the open-circuit convex ring 2011 are provided with arc-shaped transition parts that smoothly transition to the outer wall of the needle rod 201, and the outer diameter of the open-circuit convex ring 2011 is slightly larger than the outer diameter of the PICC internal catheter;

[0075] Preferably, the outer wall of the lower end of the needle rod 201 of the present application is provided with an external thread 2012, and the inner wall of the open-circuit convex ring 2011 is provided with an internal thread threadedly connected to the external thread 2012, so that the position of the open-circuit convex ring 2011 at the lower end of the needle rod 201 is adjustable, so that when the front end of the needle rod 201 pulls the needle 202 to insert into the outer end of the PICC internal catheter, it can be adjusted to abut against the outer end of the PICC internal catheter.

[0076] In this way, after the front end of the needle rod 201 pulls the needle 202 into the outer end of the PICC built-in catheter, the front and rear positions of the open-circuit convex ring 2011 are adjusted so that the front end thereof abuts against the outer end of the PICC built-in catheter. At this time, when the needle rod 201 is pulled back, the open-circuit convex ring 2011 can better play the role of stretching the subcutaneous tissue of the patient's arm, so that during the pulling back process, one end of the constructed traction channel located at the outer end of the PICC built-in catheter is stretched, so that the resistance of the subcutaneous tissue of the patient's arm at the stretched position to the outer end of the PICC built-in catheter can be better reduced, making it more difficult for the outer end of the PICC built-in catheter to separate from the pulling needle 202, so that the use effect of the present application is better.

[0077] And in the fourth embodiment, combined with Fig.10 and Fig.11As shown, the present application is made of metal material, and the present application also includes an anti-dropping component 40 for further preventing the outer end of the PICC internal catheter from falling off when the pulling needle 202 is inserted into the outer end of the PICC internal catheter;

[0078] Specifically, the anti-slip component 40 includes a fixing ring 401, a pressing spring sheet 402 and an anti-slip spring sheet 403;

[0079] The fixing ring 401 is welded to the lower outer wall of the pulling needle 202; the lower end of the anti-slip spring sheet 403 is welded to the lower outer wall of the pulling needle 202, and its upper end extends upward and outward to near the middle of the pulling needle 202; the pressing spring sheet 402 is located between the fixing ring 401 and the anti-slip spring sheet 403, and the lower end of the pressing spring sheet 402 is connected to the fixing ring 401, and the upper end is connected to the upper end of the anti-slip spring sheet 403.

[0080] In the natural state, the upper end of the pressing spring sheet 402 opens outward to prop open the upper end of the anti-drop spring sheet 403;

[0081] When the pulling needle 202 is inserted into the outer end of the PICC built-in catheter, the inner wall of the outer end of the PICC built-in catheter presses against the upper end of the anti-detachment spring sheet 403, so that the upper end of the pressing spring sheet 402 is retracted toward the side where the outer wall of the pulling needle 202 is located.

[0082] Therefore, when the upper end of the pressing spring sheet 402 is pressed and retracted toward the side where the outer wall of the pulling needle 202 is located, a reaction force will be given to the upper end of the anti-detachment spring sheet 403, so that the upper end of the anti-detachment spring sheet 403 pushes the inner wall of the outer end of the PICC built-in catheter outward, making it difficult for the outer end of the PICC built-in catheter to fall off from the outside of the pulling needle 202, so that it can be better fixed and prevented from falling off when being pulled.

[0083] Other embodiments and the like are not described one by one here.

[0084] To sum up, the overall structure of the present invention is simple, easy to implement, easy to operate, highly practical, highly specific, and has low manufacturing cost. There is no need to increase too much cost in the improvement of the structure and the improvement of the technology, which makes the present invention bound to have good market promotion value. The present invention will be very popular and can be effectively popularized.

[0085] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any transformation of equivalent structures or equivalent processes made using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multifunctional tunnel expansion measuring ruler, characterized in that: It includes a flat ruler for expanding the bag of the infusion port and detecting the size of the corresponding bag, and a tunnel needle for pulling the PICC internal catheter; The lower end of the flat ruler body is connected to the upper end of the tunnel needle as a whole; the flat ruler body is formed into a flat square body structure, its length is slightly greater than 3.0 cm, its width is 1.0 cm, its thickness is 1.0 mm, and its upper end is formed into a flat arc structure, and its outer end surface is provided with a measuring scale line A with a unit length of 2.0 mm along its length direction; The outer wall of the tunnel needle is provided with a measuring scale line B with a unit length of 1.0 cm along its length direction; The starting scale mark on the measuring scale line A is 1.0 cm and is located at the upper end, and the vertical distance between the starting scale mark on the measuring scale line A and the upper end of the flat ruler body is 1.0 cm; The width of the lower end of the flat ruler gradually increases to be equal to the outer diameter of the tunnel needle, so as to smoothly transition with the upper end of the tunnel needle; The outer end surface of the flat ruler is provided with a square-shaped hand-held block protruding outward near the lower end thereof; each end surface of the square-shaped hand-held block is recessed inward to form an anti-slip groove suitable for fingers to grip; The tunnel needle includes a needle rod and a pulling needle head connected downwardly to the lower end of the needle rod; the length of the needle rod is L1, and the length of the pulling needle head is L2; L1≥15.0cm; L2=1.0cm; The outer wall of the lower end of the needle rod is surrounded by an open-circuit convex ring for stretching the subcutaneous tissue of the patient's arm. The upper and lower ends of the open-circuit convex ring are provided with arc-shaped transition parts that smoothly transition to the outer wall of the needle rod, and the outer diameter of the open-circuit convex ring is slightly larger than the outer diameter of the PICC built-in catheter.

2. The multifunctional tunnel expansion measuring ruler according to claim 1 is characterized in that: The outer diameter of the needle rod is 6.0 mm, the outer diameter of the pulling needle gradually decreases from its upper end to its lower end, the outer diameter of the lower end of the pulling needle is 2.0 mm, and the lower end of the pulling needle is provided with a hemispherical protrusion protruding downward.

3. The multifunctional tunnel expansion measuring ruler according to claim 2 is characterized in that: The outer wall of the pulling needle is evenly provided with a plurality of anti-dropping convex rings along its length direction.

4. The multifunctional tunnel expansion measuring ruler according to claim 3 is characterized in that: The outer diameter of each circle of the anti-slip convex ring gradually decreases from its upper end to its lower end, the thickness of each circle of the anti-slip convex ring is equal to 1.0mm, the difference between the inner and outer diameters of the upper end of each circle of the anti-slip convex ring is equal to 0.5mm, and the difference between the inner and outer diameters of the lower end of each circle of the anti-slip convex ring is equal to 0.0mm.

5. The multifunctional tunnel expansion measuring ruler according to claim 4 is characterized in that: The flat ruler body, the tunnel needle and the square-shaped hand-held block are integrally formed and made of titanium alloy, and the surfaces thereof are coated with a layer of iodine tincture coating.

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