Remaining needle assembly

Abstract

The utility model relates to the technical field of medical accessories, and discloses an indwelling needle assembly which comprises a heparin cap, an indwelling needle elastic piece, an inner seat body and a seat body cover, the seat body cover is provided with a first inner hole, the inner seat body is provided with an elastic piece installation cavity, an inner seat opening and a second inner hole which are communicated with one another, and the seat body cover is connected to the inner seat opening. The remaining needle elastic piece is located in the elastic piece installation cavity and connected to the base body cover, the first inner hole and the second inner hole are coaxially formed in the two ends of the elastic piece installation cavity, the periphery of the upper end of the inner base body protrudes in the radial direction to form an inner base ring, the heparin cap comprises a rubber plug cover, the rubber plug cover is provided with a first inner base cavity, and the inner wall of the first inner base cavity is provided with a first cover body protrusion. The inner seat ring is clamped in the first inner seat cavity through the first cover body protrusion, an inner seat ring groove is formed in the periphery of the lower end of the inner seat body, the seat body cover is provided with a second inner seat cavity, a second cover body protrusion is arranged in the second inner seat cavity, and the inner seat ring groove is clamped with the second cover body protrusion. According to the remaining needle assembly, the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical accessories, in particular to an indwelling needle assembly. Background Art

[0002] In the medical field, indwelling needles are an important medical device that are widely used because they can reduce the pain of repeated punctures for patients and improve the work efficiency of medical staff. However, the traditional design of indwelling needles has some inconveniences during assembly and use, such as complex installation of shrapnel, insufficient stability of component connections, and easy falling off. These problems not only affect the use effect of the indwelling needle, but also may increase medical risks. The installation of traditional indwelling needle shrapnel often requires complicated steps and delicate operations, which not only increases the production cost, but also reduces the efficiency of assembly. At the same time, if the connection between the various components of the indwelling needle, such as the connection between the protective seat and the needle seat, the rubber plug cover, etc., is not designed reasonably, it is easy to cause loose connection or fall off during use, thereby affecting the safety of the indwelling needle and the comfort of the patient. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. The utility model provides an indwelling needle assembly, wherein the safety assembly assembly operation is simple and convenient, thereby improving the assembly efficiency of the safety assembly, and at the same time improving the connection stability and reliability of the safety assembly, thereby improving the safety of use.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a retention needle assembly, including a heparin cap and a safety assembly, the safety assembly including a retention needle spring and a protective seat body, the protective seat body including an inner seat body and a seat body cover, the seat body cover is provided with a first inner hole, the inner seat body is provided with a spring installation cavity, an inner seat opening and a second inner hole that are interconnected, the seat body cover is connected to the inner seat opening, the retention needle spring is located in the spring installation cavity and is connected to the seat body cover, the first inner hole and the second inner hole are coaxially arranged at At both ends of the spring installation cavity, the outer periphery of the upper end of the inner seat body protrudes radially to form an inner seat ring, the heparin cap includes a rubber plug cover, the rubber plug cover is provided with a first inner seat cavity, the inner wall of the first inner seat cavity is provided with a first protrusion of the cover body, the inner seat ring is clamped to the first inner seat cavity through the first protrusion of the cover body, the outer periphery of the lower end of the inner seat body is provided with an inner seat ring groove, the seat body cover is provided with a second inner seat cavity, the second inner seat cavity is provided with a second protrusion of the cover body, and the inner seat ring groove is clamped with the second protrusion of the cover body.

[0005] As a preferred solution, the outer periphery of the inner seat body protrudes radially to form a limiting ring, and the limiting ring is located between the inner seat ring and the inner seat ring groove, the lower end of the plug cover abuts against the upper end surface of the limiting ring, and the upper end of the seat body cover abuts against the lower end surface of the limiting ring.

[0006] As a preferred embodiment, a plug partition is connected to the inside of the plug cover, and the plug partition divides the inside of the plug cover into a plug cavity and the first inner seat cavity. The plug partition is provided with a partition hole. The heparin cap also includes a plug and a female needle base cover, and the female needle base cover is provided with a base cover cavity and a pin through hole. The plug is connected to the base cover cavity, and the female needle base cover is inserted into the plug cavity. The pin through hole, the partition hole, the first inner hole and the second inner hole are respectively coaxially arranged and connected.

[0007] As a preferred solution, the female needle base cover protrudes axially to form a plug limiting portion, the plug limiting portion is located in the base cover cavity, the end of the plug facing away from the plug cover is provided with a plug limiting groove, the plug limiting portion is inserted into the plug limiting groove, and the plug limiting portion is coaxially arranged with the pin through hole.

[0008] As a preferred solution, it also includes a retention component, which includes a needle hose, a connecting hose and a female needle base that are connected in sequence. The female needle base is threadedly connected to the female needle base cover, and the female needle base is connected to the pin through hole.

[0009] As a preferred solution, a female needle base partition is connected to the female needle base cover, and the female needle base partition divides the female needle base cover into a female needle connection cavity and the base cover cavity. The inner wall of the female needle connection cavity is provided with an internal thread and a guide positioning column, and the guide positioning column is connected to the female needle base partition. The pin through holes are respectively penetrated through the guide positioning column and the female needle base partition. The side of the female needle base facing the female needle base cover is provided with a guide positioning cavity and an external thread, and the guide positioning column is coaxially connected to the guide positioning cavity, the female needle base is inserted into the female needle connection cavity, and the internal thread is connected to the external thread.

[0010] As a preferred solution, a plurality of side holes are provided at one end of the needle hose away from the female needle base, and the plurality of side holes are respectively connected to the interior of the needle hose.

[0011] As a preferred solution, the indwelling needle spring includes a spring base, a first spring arm and a second spring arm, the first spring arm and the second spring arm are respectively connected to the spring base, an anti-scratch avoidance channel is formed between the first spring arm and the second spring arm, the spring base is provided with a pin insertion hole connected to the anti-scratch avoidance channel, the indwelling needle spring is located in the spring installation cavity, the spring base is connected to the seat cover, and the pin insertion hole is connected to the first inner hole.

[0012] As a preferred solution, the upper end of the first spring arm and the upper end of the second spring arm are respectively arranged with anti-scratch arc surfaces, and the anti-scratch arc surfaces and the pin hole are respectively arranged corresponding to the positions of the anti-scratch avoidance channel, and the anti-scratch avoidance channel is located between the anti-scratch arc surfaces and the pin hole.

[0013] As a preferred solution, it further includes an insertion pin, the outer periphery of the insertion pin protrudes to form a limiting protrusion, and the limiting protrusion is located in the spring installation cavity and is clamped in the pin hole.

[0014] Compared with the prior art, the beneficial effect of the indwelling needle assembly of the embodiment of the present utility model is that the protective seat body includes an inner seat body and a seat body cover, the inner seat body and the seat body cover are separately provided, the inner seat body is provided with a spring clip installation cavity and an inner seat opening, which facilitates the placement of the indwelling needle spring clip into the spring clip installation cavity, thereby improving the convenience of assembly. Among them, the seat body cover is provided with a second inner seat cavity, and the lower end of the inner seat body is inserted into the second inner seat cavity, thereby improving the connection stability between the inner seat body and the seat body cover. The lower end of the inner seat body is provided with an inner seat ring groove, and the inner wall of the second inner seat cavity is provided with a second protrusion of the cover body, and the second protrusion of the cover body is clamped with the inner seat ring groove to ensure the reliability of the connection between the inner seat body and the seat body cover. The plug cover is provided with a first inner seat cavity, and the upper end of the inner seat body is installed in the first inner seat cavity, thereby improving the connection stability between the inner seat body and the plug cover. The upper outer periphery of the inner seat body is radially protruded to form an inner seat ring. A stepped structure is formed at the upper end of the inner seat body, which is wider at the top and narrower at the bottom. The inner wall of the first inner seat cavity is provided with a first protrusion of the cover body. The inner seat ring is clamped above the first protrusion of the cover body to prevent the inner seat body from falling off from the plug cover, thereby achieving an effect of easy entry and difficult exit during assembly, and improving the reliability of the connection between the inner seat body and the plug cover. After the clinical puncture is completed, the needle of the needle is pulled out to the position of the safety component. The protective seat body can be separated from the plug cover as the needle is pulled out, and the protective seat body as a whole can be pulled out together with the needle. The operation is simple and convenient, and the operation efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 It is a schematic cross-sectional view of the overall structure of an embodiment of the present utility model.

[0017] Figure 3 This is an embodiment of the utility model Figure 2 Schematic diagram of the enlarged structure at A in FIG.

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the inner seat body in an embodiment of the present utility model.

[0019] Figure 5 It is a schematic cross-sectional view of the rubber plug cover according to an embodiment of the present invention.

[0020] Figure 6 It is a schematic cross-sectional structure diagram of the female pin base cover according to an embodiment of the present utility model.

[0021] Figure 7 It is a structural schematic diagram of a rubber plug according to an embodiment of the present utility model.

[0022] Figure 8 It is a structural schematic diagram of the indwelling needle shrapnel of an embodiment of the utility model.

[0023] Figure 9 It is a schematic diagram of the internal structure of the safety component of an embodiment of the present utility model.

[0024] Figure 10 It is a schematic cross-sectional structure diagram of the base cover according to an embodiment of the present utility model.

[0025] Figure 11 It is a schematic diagram of the assembly structure of the plug pin and the mounting assembly according to an embodiment of the present utility model.

[0026] Figure 12 It is a structural schematic diagram of an embodiment of the utility model in which the insertion needle is located within the indwelling needle shrapnel.

[0027] Figure 13 It is a schematic diagram of the overall structure of the embodiment of the utility model with the insertion needle extending out of the indwelling needle spring.

[0028] In the picture:

[0029] 10. Heparin cap; 11. Rubber plug; 12. Rubber plug limiting groove; 13. Female needle base cover; 14. Female needle base partition; 15. Rubber plug limiting portion; 16. Female needle connection cavity; 17. Base cover cavity; 18. Pin insertion hole; 19. Internal thread; 20. Guide positioning column; 21. Rubber plug cover; 22. First inner seat cavity; 23. First protrusion of the cover body; 24. Rubber plug partition; 25. Partition hole; 26. Rubber plug cavity;

[0030] 30. Safety assembly; 31. Indwelling needle spring; 32. Spring base; 33. Needle insertion hole; 34. First spring arm; 35. Second spring arm; 36. Anti-scratch arc surface; 37. Anti-scratch avoidance channel; 38. Protective seat; 39. Inner seat; 40. Limiting ring; 41. Inner seat ring; 42. Inner seat ring groove; 43. Spring mounting cavity; 44. Inner seat opening; 45. Second inner hole; 46. Seat cover; 47. First inner hole; 48. Second inner seat cavity; 49. Second protrusion on cover;

[0031] 50. Indwelling assembly; 51. Needle hose; 52. Side hole; 53. Connecting hose; 54. Female needle base; 55. Guide positioning cavity; 56. External thread;

[0032] 60. Pin; 61. Limiting protrusion. DETAILED DESCRIPTION

[0033] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should be understood that the terms "connected," "connected," "fixed," etc. used in the present invention should be interpreted broadly. For example, the terms may refer to fixed connection, detachable connection, or integration; mechanical connection, welding connection; direct connection, indirect connection through an intermediate medium, internal communication between two elements, or interaction between two elements, unless otherwise explicitly defined. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] like Figures 1 to 13 As shown, a preferred embodiment of the present invention is a retention needle assembly, comprising a retention assembly 50, a heparin cap 10 and a safety assembly 30, wherein the retention assembly 50 is threadedly connected to the heparin cap 10, the safety assembly 30 comprises a retention needle spring 31 and a protective seat body 38, the protective seat body 38 comprises an inner seat body 39 and a seat body cover 46, the seat body cover 46 is provided with a first inner hole 47, the inner seat body 39 is provided with a spring installation cavity 43, an inner seat opening 44 and a second inner hole 45 that are interconnected, the seat body cover 46 is connected to the inner seat opening 44, the retention needle spring 31 is located in the spring installation cavity 43 and is connected to the seat body cover 46, the first inner The hole 47 and the second inner hole 45 are coaxially arranged at both ends of the spring mounting cavity 43. The outer periphery of the upper end of the inner seat body 39 protrudes radially to form an inner seat ring 41. The heparin cap 10 includes a rubber plug cover 21. The rubber plug cover 21 is provided with a first inner seat cavity 22. The inner wall of the first inner seat cavity 22 is provided with a first protrusion 23 of the cover body. The inner seat ring 41 is clamped to the first inner seat cavity 22 through the first protrusion 23 of the cover body. The outer periphery of the lower end of the inner seat body 39 is provided with an inner seat ring groove 42. The seat body cover 46 is provided with a second inner seat cavity 48. The second inner seat cavity 48 is provided with a second protrusion 49 of the cover body. The inner seat ring groove 42 is clamped with the second protrusion 49 of the cover body.

[0037] The protective seat body 38 of the present invention's indwelling needle assembly includes an inner seat body 39 and a seat cover 46. The inner seat body 39 and the seat cover 46 are separate components. The inner seat body 39 is provided with a spring clip mounting cavity 43 and an inner seat opening 44, facilitating the placement of the indwelling needle spring clip 31 within the spring clip mounting cavity 43 and enhancing assembly convenience. The seat cover 46 is provided with a second inner seat cavity 48, into which the lower end of the inner seat body 39 is inserted, enhancing the connection stability between the inner seat body 39 and the seat cover 46. The lower end of the inner seat body 39 is provided with an inner seat ring groove 42, and the inner wall of the second inner seat cavity 48 is provided with a second cover protrusion 49. The second cover protrusion 49 engages with the inner seat ring groove 42, ensuring a secure connection between the inner seat body 39 and the seat cover 46. The rubber plug cover 21 is provided with a first inner seat cavity 22, into which the upper end of the inner seat body 39 is mounted, enhancing the connection stability between the inner seat body 39 and the rubber plug cover 21. The upper outer periphery of the inner seat body 39 protrudes radially to form an inner seat ring 41. A stepped structure is formed at the upper end of the inner seat body 39, which is wider at the top and narrower at the bottom. The inner wall of the first inner seat cavity 22 is provided with a first protrusion 23 of the cover body. The inner seat ring 41 is snapped onto the top of the first protrusion 23 of the cover body to prevent the inner seat body 39 from falling off from the plug cover 21, thereby achieving an effect of easy entry and difficult exit during assembly, and improving the reliability of the connection between the inner seat body 39 and the plug cover 21. After the clinical puncture is completed, the needle of the insertion needle 60 is pulled out to the position of the safety component 30. The protective seat body 38 can be separated from the plug cover 21 as the needle is pulled out. The protective seat body 38 is pulled out as a whole along with the needle, which is simple and convenient to operate and improves operational efficiency.

[0038] As one embodiment, Figures 2 to 3 As shown, the upper end size of the inner seat body 39 is set corresponding to the size of the inner wall of the first inner seat cavity 22. The lower end size of the inner seat body 39 is set corresponding to the size of the inner wall of the second inner seat cavity 48.

[0039] Further, such as Figures 2 to 5 as well as Figures 9 and 10 As shown, the outer periphery of the inner seat body 39 protrudes radially to form a limit ring 40. The limit ring 40 is located between the inner seat ring 41 and the inner seat ring groove 42. The lower end of the plug cover 21 abuts the upper end surface of the limit ring 40, and the upper end of the seat body cover 46 abuts the lower end surface of the limit ring 40. The provision of the limit ring 40 forms a stable support structure, ensuring that the plug cover 21 and the seat body cover 46 can be stably maintained in the predetermined position after assembly, and are not prone to displacement or loosening, thereby improving structural stability and reliability. The limit ring 40 serves as a reference point and positioning point during assembly, simplifying the alignment and fixing steps during the assembly process. The operator can more easily install the plug cover 21 and the seat body cover 46 to the correct position and ensure that they fit tightly with the inner seat body 39, reducing assembly errors and the need for repeated adjustments.

[0040] Further, such as Figure 2 To the picture Figure 3 as well as Figure 5 As shown, a plug partition 24 is connected to the plug cover 21, and the plug partition 24 divides the plug cover 21 into a plug cavity 26 and a first inner seat cavity 22. The plug partition 24 is provided with a partition hole 25. The heparin cap 10 also includes a plug 11 and a female needle base cover 13. The female needle base cover 13 is provided with a base cover cavity 17 and a pin through hole 18. The plug 11 is connected to the base cover cavity 17, and the female needle base cover 13 is inserted into the plug cavity 26. The pin through hole 18, the partition hole 25, the first inner hole 47 and the second inner hole 45 are respectively coaxially arranged and connected. The plug spacer 24 divides the interior of the plug cap 21 into a coaxially arranged plug cavity 26 and a first inner seat cavity 22. The female needle base cap 13 snaps into the plug cavity 26, and the inner seat body 39 snaps into the first inner seat cavity 22, thereby securing the connection between the female needle base cap 13 and the inner seat body 39. This helps to improve the stability of the connection between the female needle base cap 13, the plug cap 21, and the inner seat body 39. The pin through-hole 18, the spacer hole 25, the first inner hole 47, and the second inner hole 45 are coaxially arranged and interconnected, allowing the insertion needle 60 to smoothly pass through the heparin cap 10 and the safety assembly 30 in sequence, facilitating smoother operation. The plug 11 is connected to the base cap cavity 17 and is restrained by the plug cap 21 and the female needle base cap 13, ensuring that the plug 11 remains within the base cap cavity 17. The plug 11 is connected to the base cap cavity 17, and the insertion needle 60 of the puncture portion passes through the plug 11, forming a single unit with the retention portion. After puncture, the puncture part is pulled out, and the rubber plug 11 is sealed under its own elastic force, so that the retention part will not leak blood due to the withdrawal of the puncture needle.

[0041] As one embodiment, Figure 5 as well as Figure 10 As shown, the plug cover 21 and the seat cover 46 have the same structure, which reduces production costs and improves assembly efficiency.

[0042] Further, such as Figures 2 to 3 as well as Figures 7 and 8 As shown, the female needle base cover 13 protrudes axially to form a plug limiting portion 15, and the plug limiting portion 15 is located in the base cover cavity 17. A plug limiting groove 12 is provided at the end of the plug 11 away from the plug cover 21, and the plug limiting portion 15 is inserted into the plug limiting groove 12. The plug limiting portion 15 is coaxially arranged with the pin through hole 18. The plug limiting portion 15 is corresponding to the shape of the plug limiting groove 12. The plug limiting portion 15 is inserted into the plug limiting groove 12 to prevent the plug 11 from moving radially and to limit the plug 11. At the same time, the plug limiting portion 15 is coaxially arranged with the pin through hole 18 to ensure that when the pin 60 is inserted from the plug cover 21 to the female needle base cover 13, the pin 60 must pass through the plug 11, to ensure that after puncture, the puncture part is pulled out, and the plug 11 is sealed under its own elastic force, so that the retention part will not leak blood due to the withdrawal of the puncture needle.

[0043] As one embodiment, Figures 2 to 3As shown, the outer peripheral wall of the rubber plug 11 is in contact with the base cover cavity 17 , thereby improving the sealing performance between the rubber plug 11 and the base cover cavity 17 .

[0044] Further, such as Figures 1 to 2 As shown, the device also includes a retention assembly 50, which includes a needle hose 51, a connecting hose 53, and a female needle base 54, which are connected in sequence. The female needle base 54 is threadedly connected to the female needle base cover 13 and communicates with the insertion needle through hole 18. The threaded connection between the female needle base 54 and the female needle base cover 13 is simple and convenient to operate, improving assembly efficiency.

[0045] As one embodiment, the needle tube 51 is made of PP material and is not likely to damage blood vessels when the needle tube 51 is placed in the human body.

[0046] Further, such as Figures 2 to 3 as well as Figure 6 As shown, the female pin base cover 13 is internally connected to a female pin base partition 14, which divides the female pin base cover 13 into a female pin connection cavity 16 and a base cover cavity 17. The inner wall of the female pin connection cavity 16 is provided with an internal thread 19 and a guide and positioning post 20, which is connected to the female pin base partition 14. Pin through-holes 18 are respectively provided through the guide and positioning post 20 and the female pin base partition 14. The female pin base 54 is provided with a guide and positioning cavity 55 and an external thread 56 on the side facing the female pin base cover 13. The guide and positioning post 20 is coaxially connected to the guide and positioning cavity 55. The female pin base 54 is inserted into the female pin connection cavity 16, and the internal thread 19 is connected to the external thread 56. When the female pin base 54 and the female pin base cover 13 are assembled, the assembly of the guide and positioning post 20 and the guide and positioning cavity 55 provides a guiding role during the initial positioning and plugging process, improving the assembly positioning accuracy and facilitating the assembly operation. After the female needle base 54 and the female needle base cover 13 are positioned, they are rotatably connected through the internal thread 19 and the external thread 56 to improve the connection stability between the female needle base 54 and the female needle base cover 13 and ensure safety in use.

[0047] Further, such as Figures 1 to 2 As shown, a plurality of side holes 52 are provided at one end of the needle hose 51 away from the female needle base 54, and the plurality of side holes 52 are respectively connected to the interior of the needle hose 51. By providing the plurality of side holes 52, the blood flow rate during hemodialysis is increased compared with the needle hose 51 of the same specification.

[0048] As one embodiment, Figures 1 to 2 As shown, the needle hose 51 and the connecting hose 53 are connected by a sleeve joint, which improves the connection reliability of the needle hose 51 and the connecting hose 53. The setting of the connecting hose 53 is convenient for preventing blood from flowing out when replacing the connector.

[0049] Further, such as Figures 1 to 2 as well as Figures 8 and 9As shown, the indwelling needle spring 31 includes a spring base 32, a first spring arm 34, and a second spring arm 35. The first and second spring arms 34, 35 are respectively connected to the spring base 32. A scratch-proof avoidance channel 37 is formed between the first and second spring arms 34, 35. The spring base 32 is provided with a pin insertion hole 33 that communicates with the scratch-proof avoidance channel 37. The indwelling needle spring 31 is located in the spring mounting cavity 43. The spring base 32 is connected to the base cover 46, and the pin insertion hole 33 communicates with the first inner hole 47. When the insertion needle 60 moves within the scratch-proof avoidance channel 37, it avoids contact with the first and second spring arms 34, 35. This prevents scratches on the insertion needle 60, which could harbor bacteria and other microorganisms and increase the risk of infection, thereby improving user safety. Furthermore, scratches on the outer periphery of the insertion needle 60 often require replacement or disposal, reducing resource waste.

[0050] Further, such as Figure 8 As shown, anti-scratch curved surfaces 36 are arranged opposite each other at the upper ends of the first and second spring arms 34, 35. The anti-scratch curved surfaces 36 and the pin hole 33 are positioned correspondingly to anti-scratch avoidance channels 37, with the anti-scratch avoidance channels 37 located between the anti-scratch curved surfaces 36 and the pin hole 33. When the pin 60 passes through the upper ends of the first and second spring arms 34, 35, it contacts the curved surface. Compared to a flat surface, a curved surface can disperse the impact force over a larger area when contacting an external object, thereby reducing the pressure per unit area. Furthermore, the curved surface lacks sharp edges, reducing the probability of damage to the outer surface of the pin 60.

[0051] As one embodiment, Figure 8 As shown, in the first direction, an anti-scratch avoidance channel 37 is formed between the first spring arm 34 and the second spring arm 35. In the second direction, the projections of the first spring arm 34 and the second spring arm 35 intersect. The first direction is perpendicular to the second direction, so that the first spring arm 34 and the second spring arm 35 are arranged to intersect. When assembling the pin 60, it is only necessary to gently squeeze the first side plate and the second side plate to separate the upper end of the first spring arm 34 from the upper end of the second spring arm 35 to form an outlet for the pin 60, so that the pin 60 can smoothly extend out of the spring sheet, which is simple to operate and improves assembly efficiency.

[0052] Further, such as Figures 11 to 13 As shown, the device further includes an insertion pin 60. A stopper protrusion 61 is formed on the outer periphery of the insertion pin 60. The stopper protrusion 61 is located within the spring-loaded mounting cavity 43 and engages with the insertion pin hole 33. When the insertion pin 60 is retracted into the indwelling needle spring 31, the stopper protrusion 61 engages with the insertion pin hole 33, ensuring that the insertion pin 60 is retained in the indwelling needle spring 31, preventing the insertion pin 60 from falling out and improving user safety.

[0053] In summary, the present invention provides an indwelling needle assembly. The protective seat body 38 includes an inner seat body 39 and a seat cover 46. The inner seat body 39 and the seat cover 46 are separately provided. The inner seat body 39 is provided with a spring mounting cavity 43 and an inner seat opening 44, which facilitates the placement of the indwelling needle spring 31 into the spring mounting cavity 43, thereby improving assembly convenience. The seat cover 46 is provided with a second inner seat cavity 48, into which the lower end of the inner seat body 39 is inserted, thereby improving the connection stability between the inner seat body 39 and the seat cover 46. The lower end of the inner seat body 39 is provided with an inner seat ring groove 42, and the inner wall of the second inner seat cavity 48 is provided with a second cover protrusion 49. The second cover protrusion 49 engages with the inner seat ring groove 42 to ensure the reliability of the connection between the inner seat body 39 and the seat cover 46. The plug cover 21 is provided with a first inner seat cavity 22, and the upper end of the inner seat body 39 is installed in the first inner seat cavity 22, improving the connection stability between the inner seat body 39 and the plug cover 21. The upper end outer periphery of the inner seat body 39 is formed with an inner seat ring 41 protruding radially. A stepped structure is formed at the upper end of the inner seat body 39, which is wider at the top and narrower at the bottom. The inner wall of the first inner seat cavity 22 is provided with a first protrusion 23 of the cover body. The inner seat ring 41 is snapped onto the top of the first protrusion 23 of the cover body to prevent the inner seat body 39 from falling off the plug cover 21, thereby achieving an effect of easy entry and difficult exit during assembly, and improving the reliability of the connection between the inner seat body 39 and the plug cover 21. After the clinical puncture is completed, the needle of the insertion needle 60 is pulled out to the position of the safety component 30. The protective seat body 38 can be separated from the plug cover 21 as the needle is pulled out. The protective seat body 38 is pulled out as a whole along with the needle, which is simple and convenient to operate and improves operational efficiency.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. An indwelling needle assembly, characterized in that: The cam is secured to the inner wall of the cam and is secured to the second support frame, and the cam has a first end secured therein with a second end secured therein to the second support frame.

2. The indwelling needle assembly according to claim 1, characterized in that: The outer periphery of the inner seat body protrudes radially to form a limiting ring, which is located between the inner seat ring and the inner seat ring groove. The lower end of the plug cover abuts against the upper end surface of the limiting ring, and the upper end of the seat body cover abuts against the lower end surface of the limiting ring.

3. The indwelling needle assembly according to claim 2, characterized in that: A plug partition is connected to the plug cover, and the plug partition divides the plug cover into a plug cavity and the first inner seat cavity. The plug partition is provided with a partition hole. The heparin cap also includes a plug and a female needle base cover. The female needle base cover is provided with a base cover cavity and a pin through hole. The plug is connected to the base cover cavity, and the female needle base cover is inserted into the plug cavity. The pin through hole, the partition hole, the first inner hole and the second inner hole are respectively coaxially arranged and connected.

4. The indwelling needle assembly according to claim 3, characterized in that: The female needle base cover protrudes axially to form a plug limiting portion, the plug limiting portion is located in the base cover cavity, the end of the plug away from the plug cover is provided with a plug limiting groove, the plug limiting portion is inserted into the plug limiting groove, and the plug limiting portion is coaxially arranged with the pin through hole.

5. The indwelling needle assembly according to claim 3, characterized in that: It also includes a retention component, which includes a needle hose, a connecting hose and a female needle base that are connected in sequence. The female needle base is threadedly connected to the female needle base cover, and the female needle base is connected to the pin through hole.

6. The indwelling needle assembly according to claim 5, characterized in that: A female needle base partition is connected to the female needle base cover, and the female needle base partition divides the female needle base cover into a female needle connection cavity and the base cover cavity. The inner wall of the female needle connection cavity is provided with an internal thread and a guide positioning column, and the guide positioning column is connected to the female needle base partition. The pin through holes are respectively penetrated through the guide positioning column and the female needle base partition. The side of the female needle base facing the female needle base cover is provided with a guide positioning cavity and an external thread, and the guide positioning column is coaxially connected to the guide positioning cavity. The female needle base is inserted into the female needle connection cavity, and the internal thread is connected to the external thread.

7. The indwelling needle assembly according to claim 5, characterized in that: A plurality of side holes are provided at one end of the needle hose away from the female needle base, and the plurality of side holes are respectively communicated with the interior of the needle hose.

8. The indwelling needle assembly according to claim 1, characterized in that: The indwelling needle spring clip includes a spring clip base, a first spring clip arm and a second spring clip arm, the first spring clip arm and the second spring clip arm are respectively connected to the spring clip base, an anti-scratch avoidance channel is formed between the first spring clip arm and the second spring clip arm, the spring clip base is provided with a pin insertion hole connected to the anti-scratch avoidance channel, the indwelling needle spring clip is located in the spring clip mounting cavity, the spring clip base is connected to the seat cover, and the pin insertion hole is connected to the first inner hole.

9. The indwelling needle assembly according to claim 8, characterized in that: The upper end of the first spring arm and the upper end of the second spring arm are respectively arranged with anti-scratch arc surfaces, and the anti-scratch arc surfaces and the pin hole are respectively arranged corresponding to the positions of the anti-scratch avoidance channel, and the anti-scratch avoidance channel is located between the anti-scratch arc surfaces and the pin hole.

10. The indwelling needle assembly according to claim 8, characterized in that: It also includes an insertion pin, the outer periphery of the insertion pin protrudes to form a limiting protrusion, and the limiting protrusion is located in the spring installation cavity and is clamped in the pin hole.

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