Remaining needle capable of preventing secondary puncture
By designing an indwelling needle to prevent secondary punctures, the problem of infection and healthcare worker safety when using indwelling needles on firm sites is solved, achieving effective support for blood vessels and safe retrieval of the needle.
Patent Information
- Application Number
- CN202421761342.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-07-23
AI Technical Summary
When indwelling needles are used in areas with abundant and firm muscle tissue, soft outer cannulas are not effective. After the needle is removed, a small puncture hole is left, which increases the risk of bacterial infection, and the exposed needle tip endangers the safety of medical staff.
A second-puncture-proof indwelling needle is designed, which combines a perforated inner needle with a flat-tipped outer needle. The perforated inner needle can be retracted and infused through the flow hole to avoid the formation of a puncture hole. At the same time, a special storage component is used to retrieve the needle tip, reducing needle tip exposure.
It effectively supports blood vessels in solid locations, prevents infection at puncture sites, reduces the risk of puncture injuries to medical staff, and improves safety during use.
Smart Images
Figure CN223555265U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to an indwelling needle. Background Technology
[0002] An indwelling needle is a medical device designed for intravenous infusion. In actual use, the indwelling catheter is placed in the blood vessel by guiding the needle core and fixing the three-way connector. The indwelling catheter left in the blood vessel can avoid the need for multiple punctures of the blood vessel due to continuous infusion, which can cause damage to the blood vessel.
[0003] In daily use, most indwelling needles are soft catheters with an embedded puncture needle. When the puncture needle is inserted into the patient's blood vessel, the soft catheter will also enter the patient's blood vessel. After this operation is completed, the puncture needle can be withdrawn from the blood vessel, leaving the soft catheter in the blood vessel and pushing it further into the blood vessel. This completes the use of the indwelling needle.
[0004] However, the soft outer cannula of indwelling needles is often used on soft areas such as the hands and head. If used on areas with abundant and firm muscle tissue, the effectiveness of the soft outer cannula of the indwelling needle will be greatly reduced. In addition, after the outer cannula is inserted, the puncture needle of a typical indwelling needle is removed. After the puncture needle is removed, a small puncture hole is left at the T-connector, which poses a risk of bacterial infection. If the inner needle is not removed, it may cause secondary puncture of the patient's blood vessels. The removed puncture needle is usually partially exposed to the air, which poses a risk of blood infection to medical staff due to accidental touching or being pricked by the puncture needle. Utility Model Content
[0005] This invention provides an indwelling needle that prevents secondary punctures, overcoming the problem that indwelling needles with soft outer sheaths are not effective in firmer parts of the body. It also ensures that there is no risk of infection caused by leaving a puncture hole when the needle is pulled out, and that there is no risk of blood infection for medical staff due to blood exposure of the indwelling needle.
[0006] This utility model provides the following technical solution:
[0007] A secondary puncture prevention indwelling needle includes a three-way connector with an output end, a side input end, and an interface end. A fluid reservoir and an isolation plug are sequentially arranged from the output end to the interface end. The output end also has a flat-headed outer needle communicating with the fluid reservoir. The needle also includes a needle holder, a perforated inner needle, a retrieval spring, a flow hole, a needle holder limiting mechanism for fixing the needle holder, and a storage assembly for retrieval and storage. One end of the storage assembly is sleeved on the interface end, and the needle holder is slidably disposed inside that end. A space is provided between the needle holder and the storage assembly. The needle holder limiting mechanism has one end connected to the bottom of the storage assembly via the retraction spring, and the other end of the needle holder is provided with the perforated inner needle. The perforated inner needle passes through the isolation plug and the liquid storage tank, and is tightly fitted and slidably disposed inside the flat-headed outer needle. The length of the perforated inner needle body is equal to the length from the isolation plug to the flat-headed outer needle body, and the needle tip length of the perforated inner needle is greater than the needle tip length of the flat-headed outer needle. The perforated inner needle is also provided with a flow hole for connecting the liquid storage tank and the perforated inner needle.
[0008] Furthermore, the storage assembly includes an outer storage tube, an inner storage tube, a first annular limiting part, a second annular limiting part, and a first circular limiting part. The length of the outer storage tube is greater than the length of the perforated inner needle. The inner storage tube is slidably sleeved inside the outer storage tube. One end of the outer storage tube is connected to the interface end of the tee connector, and the other end is provided with the first annular limiting part. The inner diameter of the first annular limiting part is equal to the outer diameter of the inner storage tube. The end of the inner storage tube near the needle seat is provided with the second annular limiting part. The outer diameter of the second annular limiting part is equal to the inner diameter of the outer storage tube. The inner diameters of the second annular limiting part and the inner diameter of the inner storage tube are both equal to the diameter of the needle seat. The other end of the inner storage tube is also provided with the first circular limiting part. The diameter of the first circular limiting part is equal to the inner diameter of the first annular limiting part. The retraction spring is provided inside the first circular limiting part on the connection surface with the inner storage tube, and the actuating handle is also provided on the other side of the first circular limiting part.
[0009] Furthermore, it also includes the third annular limiting part, which is provided inside the inner receiving tube. The inner diameter of the third annular limiting part is larger than the diameter of the recovery spring, the outer diameter of the third annular limiting part is equal to the diameter of the needle seat, and the distance from the needle seat to the third annular limiting part is smaller than the distance from the flow hole to the isolation plug.
[0010] Furthermore, it also includes a storage groove and an elastic membrane. The needle seat limiting mechanism includes a button and a limiting block, and the button and the limiting block are arranged sequentially along the outer storage tube towards the needle seat. The button protrudes from the outer storage tube. The needle seat also has the storage groove, and the elastic membrane is disposed in the storage groove. The elastic membrane and the storage groove form a cavity and also support the limiting block. The sum of the thickness of the limiting block and the thickness of the elastic membrane is equal to the length of the storage groove, and the length of the limiting block is greater than the length from the elastic membrane to the opening of the storage groove.
[0011] Furthermore, anti-detachment structures are symmetrically arranged on both sides of the button. The anti-detachment structures include the limiting slide groove and the protruding wing. The internal cavity length of the limiting slide groove is greater than the distance from the limiting block to the bottom of the storage groove cavity. The limiting slide groove is symmetrically arranged on the tube wall of the outer storage tube on both sides of the button. The protruding wing is symmetrically connected to both sides of the button and is slidably stored inside the limiting slide groove.
[0012] Furthermore, it also includes the sealing plug, which is disposed between the needle seat and the isolation plug.
[0013] In this invention, when an indwelling needle needs to be inserted into a relatively firm part of the body, the presence of the flat-tipped outer needle provides excellent support for the blood vessel compared to the soft outer catheter. Furthermore, during use, the perforated inner needle is not pulled out; only the needle tip retracts, allowing fluid to be delivered through the flow port. This avoids the isolation plug leaving a puncture hole that could lead to bacterial infection. Simultaneously, the retracted needle tip prevents secondary puncture of the patient's blood vessels due to patient movement. After use, the perforated inner needle is retrieved using a dedicated storage component, further reducing the likelihood of medical personnel coming into contact with the needle tip and minimizing bloodborne infections caused by punctures. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of an indwelling needle;
[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0016] Figure 3 This is an exploded view of the needle hub structure of an indwelling needle;
[0017] Figure 4 This is a schematic diagram of the structure of an indwelling needle with a hole after retraction.
[0018] Figure 5 for Figure 4 Enlarged view of point B in the middle;
[0019] Figure 6This is a schematic diagram showing the combination of the perforated inner needle, the hollow outer needle, and the liquid storage tank in an indwelling needle.
[0020] Figure label:
[0021] 1. Three-way connector; 2. Liquid reservoir; 3. Isolation plug; 4. Flat-headed outer needle; 5. Needle seat; 6. Inner needle with hole; 7. Retrieval spring; 8. Flow hole; 9. Outer receiving tube; 10. Inner receiving tube; 11. First annular limiting part; 12. Second annular limiting part; 13. First circular limiting part; 14. Third annular limiting part; 15. Receiving groove; 16. Elastic membrane; 17. Button; 18. Limiting block; 19. Limiting slide; 20. Protruding wing; 21. Sealing plug; 22. Actuating handle. Detailed Implementation
[0022] The embodiments of the present invention will now be described with reference to the accompanying drawings.
[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.
[0024] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.
[0025] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0026] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0027] Example:
[0028] The main body of the indwelling needle includes a three-way connector 1, which comprises an output end, a side input end, and an interface end. The three-way connector 1 internally houses an isolation plug 3 and a fluid reservoir 2. The three-way connector 1 is existing technology and will not be elaborated upon further. A flat-headed outer needle 4 is connected to the output end of the three-way connector 1 and communicates with the fluid reservoir 2. Advantageously, a storage component is fitted onto the interface end of the three-way connector 1. Inside this storage component, a needle holder 5 and a needle holder limiting mechanism are slidably arranged. The needle holder limiting mechanism is used to limit the position of the needle holder 5, ensuring that the needle holder 5 can stop at the desired position. One end of the needle holder 5 is connected to a recovery spring. Spring 7 is connected to the bottom of the storage assembly. The other end of the needle holder 5 is provided with a perforated inner needle 6, which penetrates the isolation plug 3 and the liquid reservoir 2. It is also tightly fitted and slidably disposed inside the flat-headed outer needle 4. The length of the perforated inner needle 6 is equal to the sum of the thickness of the isolation plug 3, the length of the liquid reservoir 2, and the length of the flat-headed outer needle 4. The tip of the perforated inner needle 6 protrudes from the tip of the flat-headed outer needle 4. The retraction spring 7 is used to pull the needle holder 5 back, further retracting the tip of the perforated inner needle 6. The needle holder limiting mechanism ensures that the needle holder 5 can stably stop in the storage assembly without being activated. Inside the assembly, the retrieval spring 7 is currently taut, ensuring the perforated inner needle 6 is stably positioned inside the flat-headed outer needle 4 and that the perforated inner needle 6 can be retrieved. The length of the perforated inner needle 6 is equal to the thickness of the isolation plug 3 plus the length of the reservoir 2 and the flat-headed outer needle 4, and the length of the needle tip of the perforated inner needle 6 is greater than the length of the flat-headed outer needle 4. This ensures that the perforated inner needle 6 can function as a puncture needle and can be retrieved and inserted into the flat-headed outer needle 4. The storage assembly is used to retrieve the perforated inner needle 6, ensuring that the perforated inner needle 6 is isolated from the outside environment and will not cause secondary injury to medical personnel. The perforated inner needle 6 also has a flow hole 8 for circulation. The purpose of the flow hole 8 is to ensure that the entire indwelling needle can function properly. Because the flat-headed outer needle 4 and the perforated inner needle 6 fit tightly together, while ensuring the sealing of the indwelling needle, it also prevents fluid from passing through the gaps and thus prevents fluid circulation. The flow hole 8 can solve this problem well. In addition, the perforated inner needle 6 does not completely withdraw from the tee connector 1 during use, but only partially retracts. This ensures that the perforated inner needle 6 will not leave a puncture hole due to passing through the isolation plug 3, thereby increasing the risk of bacterial infection for the patient.
[0029] Advantageously, the storage assembly includes an outer storage tube 9, an inner storage tube 10, a first annular limiting part 11, a second annular limiting part 12, and a first circular limiting part 13. The outer storage tube 9 is slidably fitted inside the inner storage tube 10 to form a receiving cavity for the storage assembly. One end of the outer storage tube 9 is connected to the tee connector 1, and the other end of the outer storage tube 9 is provided with the first annular limiting part 11. The inner diameter of the first annular limiting part 11 is equal to the outer diameter of the inner storage tube 10. The end of the inner storage tube 10 near the tee connector 1 is provided with the second annular limiting part 12. The outer diameter of the second annular limiting part 12 is equal to the inner diameter of the outer storage tube 9. Both the inner diameter of the second annular limiting part 12 and the inner diameter of the inner storage tube 10 are equal to the diameter of the pin seat 5. This arrangement of the first annular limiting part 11 and the second annular limiting part 12 ensures that when the outer storage tube is closed, the inner storage tube 9 is closed. The inner tube 9 and the outer tube 10 can slide relatively smoothly, and the first and second annular limiting parts 12 restrict and block each other, so that the inner tube 10 and the outer tube 9 will not separate from each other; the other end of the inner tube 10 is also provided with a first circular limiting part 13, the diameter of the first circular limiting part 13 is equal to the inner diameter of the first annular limiting part 11, so as to ensure that the inner tube 10 is completely placed inside the outer tube 9; a retraction spring 7 is provided on the connecting surface of the first circular limiting part 13 and the inner tube 10, and a toggle handle 22 is also provided on the other side of the first circular limiting part 13. The retraction spring 7 here is the same as above, used to retract the needle seat 5, and the toggle handle 22 can assist medical staff to push out the entire storage assembly after use, or help medical staff to adjust the indwelling needle during use.
[0030] Advantageously, the inner receiving tube 10 also has a third annular limiting part 14 inside. The inner diameter of the third annular limiting part 14 is larger than the diameter of the return spring 7, and the outer diameter of the third annular limiting part 14 is equal to the diameter of the needle seat 5. The distance from the needle seat 5 to the third annular limiting part 14 is less than the distance from the flow hole 8 to the isolation plug 3. The third annular limiting part 14 is used to limit the return distance of the needle seat 5. Without the third annular limiting part 14, if the return spring 7 returns the needle seat 5 too far, the flow hole 8 will shrink to the isolation plug. 3. Inside, this would prevent the flow hole 8 from functioning as a flow channel. After the third annular limiting part 14 is provided, and it is ensured that the distance from the needle seat 5 to the third annular limiting part 14 is less than the distance from the flow hole 8 to the isolation plug 3 in the initial state, it can be ensured that the flow hole 8 can never be retracted into the isolation plug 3, and the flow function can be well realized. The length of the outer storage tube 9 is greater than the length of the perforated inner needle 6, which can ensure that the needle seat 5 can still complete the storage of the perforated inner needle 6 even when it is restricted by the third annular limiting part 14.
[0031] Advantageously, the needle holder limiting mechanism is arranged with a button 17 and a limiting block 18 sequentially along the outer storage tube 9 towards the needle holder 5. The button 17 protrudes from the outer storage tube 9, which is convenient for medical personnel to press after use to retrieve the perforated inner needle 6. The needle holder 5 also has a storage groove 15, in which an elastic membrane 16 is provided. The elastic membrane 16 is made of a highly elastic material. One side of the elastic membrane 16 forms a cavity with the storage groove 15, and the other side of the elastic membrane 16 supports the limiting block 18. The length of the limiting block 18 is less than the length of the storage groove 15, and the length of the limiting block 18 is greater than the distance from the elastic membrane 16 to the opening of the storage groove 15. The length of the needle holder 5 is such that the storage groove 15 on the needle holder 5 facilitates the retraction of the limiting block 18, which in turn drives the retraction spring 7 to retract the needle holder 5. An elastic membrane 16 is provided in the storage groove 15 to support the limiting block 18. The length of the limiting part here is less than the overall length of the storage groove 15, but greater than the length from the elastic membrane 16 to the opening of the storage groove 15. On the one hand, this ensures that in the initial state, the limiting block 18 can perform the limiting function of the needle holder 5. On the other hand, it ensures that when the button 17 is pressed, it pushes the limiting block 18 to press the elastic membrane 16 to deform, so that the entire limiting block 18 is retracted into the storage groove 15. This further ensures that the retraction spring 7 will not be stuck by the limiting block 18 when pulling back the needle holder 5, thus preventing it from being retracted.
[0032] Advantageously, anti-drop structures are symmetrically arranged on both sides of the button 17. The anti-drop structures are limited sliding grooves 19 and protruding wings 20 symmetrically arranged on both sides of the button 17. The length of the limited sliding groove 19 is greater than the distance from the limiting block 18 to the bottom of the cavity of the storage groove 15. This arrangement can ensure that the button 17 will not be restricted in its sliding position by the limited sliding groove 19 when pushing the limiting block 18. The limited sliding groove 19 is a concave groove structure and is symmetrically arranged on both sides of the button 17. The protruding wings 20 are symmetrically arranged on both sides of the button 17. The protruding wings 20 are slidably arranged inside the limited sliding groove 19 to ensure that the button 17 only slides within the limited range and will not fall off the outer storage tube 9, thus losing the limiting function.
[0033] Advantageously, a sealing plug 21 is also provided on the top of the needle hub 5 inside the outer storage tube 9. The indwelling needle passes through the sealing plug 21 in the initial state. When the indwelling needle is finished and the perforated inner needle 6 is retracted into the storage assembly, the sealing plug 21 can ensure that the needle tip of the perforated inner needle 6 is not exposed. This can ensure that when the indwelling needle assembly is processed separately, the needle tip can be prevented from pricking medical staff and causing secondary infection.
[0034] The working principle of the indwelling needle is as follows: First, the flat-tipped outer needle 4 is guided by the perforated inner needle 6 to complete the puncture and leave the flat-tipped outer needle 4 in the patient's body. If the position needs to be adjusted, the position of the indwelling needle can be adjusted by turning the handle 22 to fix the indwelling needle. Then, by pressing the button 17, the button 17 slides inside the limiting groove 22 through the protruding wing 21, further pushing the limiting block 18 to press the elastic membrane 16 to deform, and further pushing it into the receiving groove 15. When the limiting block 18 is fully inserted into the receiving groove 15, the retraction spring 7 can pull back the needle seat 5. When the needle seat 5 is locked in the third position... On the annular limiting part 14, the perforated inner needle 6 is retracted. When the entire indwelling needle is no longer in use, the entire inner storage tube 10 is pulled out of the outer storage tube 9 by the lever 22. When the first annular limiting part 11 and the second annular limiting part 12 are locked together, the perforated inner needle 6 will be stored in the storage component because the length of the outer storage tube 9 is greater than the length of the perforated inner needle 6. The storage component is also provided with a sealing plug 21. The perforated inner needle 6 will be retracted below the sealing plug 21, and the needle tip will also be hidden in the storage component. Then, the three-way connector 1 is separated from the storage component to complete the use.
[0035] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A secondary puncture prevention indwelling needle, comprising a tee joint (1), the tee joint (1) has three ends, which are an output end, a side input end and an interface end, a liquid storage bin (2) and an isolation plug (3) are sequentially arranged from the output end to the interface end, and the output end is further provided with a flat head outer needle (4) communicating with the liquid storage bin (2), characterized in that, It also includes a needle hub (5), a hole inner needle (6), a recovery spring (7), a flow hole (8), a needle hub limiting mechanism for fixing the needle hub, and a storage assembly for recovery and storage, one end of the storage assembly is sleeved on the interface end, and the inside of this end is also slidably provided with the needle hub (5), the needle hub and the storage assembly are also provided with the needle hub limiting mechanism, one end of the needle hub (5) is connected to the bottom end of the storage assembly through the recovery spring (7), the other end of the needle hub (5) is also provided with the hole inner needle (6), the hole inner needle (6) penetrates through the isolation plug (3) and the liquid storage compartment (2), and is closely and slidably arranged inside the flat head outer needle (4), the length of the needle body of the hole inner needle (6) is equal to the length of the needle body of the flat head outer needle (4), and the length of the needle tip of the hole inner needle (6) is greater than the length of the needle tip of the flat head outer needle (4), the hole inner needle (6) is also provided with the flow hole (8) for communicating the liquid storage compartment (2) and the hole inner needle (6).
2. The secondary stick prevention indwelling needle according to claim 1, wherein The storage assembly includes an outer storage tube (9), an inner storage tube (10), a first annular limiting portion (11), a second annular limiting portion (12), and a first circular limiting portion (13), the length of the outer storage tube (9) is greater than the length of the hole inner needle (6), the inner storage tube (10) is slidably sleeved inside the outer storage tube (9), one end of the outer storage tube (9) is connected to the interface end of the three-way joint (1), and the other end is provided with the first annular limiting portion (11), the inner diameter of the first annular limiting portion (11) is equal to the outer diameter of the inner storage tube (10), one end of the inner storage tube (10) close to the needle hub (5) is provided with the second annular limiting portion (12), the outer diameter of the second annular limiting portion (12) is equal to the inner diameter of the outer storage tube (9), the inner diameter of the second annular limiting portion (12) and the inner diameter of the inner storage tube (10) are both equal to the diameter of the needle hub (5), the other end of the inner storage tube (10) is also provided with the first circular limiting portion (13), the diameter of the first circular limiting portion (13) is equal to the inner diameter of the first annular limiting portion (11), the first circular limiting portion (13) is internally provided with the recovery spring (7) on the connection surface of the inner storage tube (10), and the other surface of the first circular limiting portion (13) is also provided with a knob (22).
3. The secondary stick prevention indwelling needle according to claim 2, wherein It also includes a third annular limiting portion (14), the inner storage tube (10) is internally provided with the third annular limiting portion (14), and the inner diameter of the third annular limiting portion (14) is greater than the diameter of the recovery spring (7), the outer diameter of the third annular limiting portion (14) is equal to the diameter of the needle hub (5), and the distance from the needle hub (5) to the third annular limiting portion (14) is less than the distance from the flow hole (8) to the isolation plug (3).
4. The secondary stick prevention indwelling needle according to claim 3, wherein Also include the accommodation groove and the elastic film, the needle seat limiting mechanism includes button and limiting block, and the button (17) and the limiting block (18) are sequentially arranged along the outer accommodation tube (9) to the needle seat (5) direction, the button (17) is arranged and the outer accommodation tube (9) is projected, the needle seat (5) is also provided with the accommodation groove (15), the accommodation groove (15) is provided with the elastic film (16), the elastic film (16) and the accommodation groove (15) form a cavity, also support the limiting block (18), the thickness of the limiting block (18) and the elastic film is equal to the length of the accommodation groove (15), and the length of the limiting block (18) is greater than the length of the elastic film (16) to the length of the accommodation groove (15) slot.
5. The secondary stick prevention indwelling needle according to claim 4, wherein The button (17) both sides are also provided with anti-drop structure symmetrically, the anti-drop structure includes limiting sliding slot (19) and protruding wing (20), and the internal cavity length of the limiting sliding slot (19) is greater than the distance of the limiting block (18) to the bottom end of the accommodation groove (15) cavity, the limiting sliding slot (19) is symmetrically arranged on the pipe wall of the outer accommodation tube (9) of the button (17) both sides, the protruding wing (20) is symmetrically connected on the button (17) both sides, and the protruding wing (20) is slidably accommodated in the limiting sliding slot (19) inside.
6. The secondary stick prevention indwelling needle according to claim 5, wherein Also include sealing plug (21), the sealing plug (21) is arranged between the needle seat (5) and the isolation plug (3).