An injection needle

Abstract

The utility model discloses an injection needle, which mainly includes a needle seat, a holder and a protective sleeve. The holder is sleeved on the needle seat, and the protective sleeve is sleeved on the holder. The needle seat includes three arc-shaped side panels, and one end of the arc-shaped side panel includes a second end portion. The protective sleeve includes three ratchets, and the two sides of the ratchets in the circular ring are respectively an arc side and a concave side. The second end portion can move from the arc side to the concave side, but cannot move from the concave side to the arc side, so as to ensure that the protective sleeve can only rotate clockwise and cannot rotate counterclockwise. After rotating clockwise, the second end portion moves and engages with the concave side of the ratchet, so as to avoid the needle tube being exposed outside the protective sleeve. The advantage of the utility model is that it avoids the safety problem of needle tube exposure, and through the self-destruction function, it effectively prevents the injection needle from being used twice, and eliminates all safety hazards.

Description

Technical Field

[0001] The utility model relates to the technical field of syringes, in particular to an injection needle. Background Art

[0002] Comparative document 1, patent number: CN200620038771.0, application date: 2006.01.06, announcement number: CN2882649Y, announcement date: 2007.03.28, patentee: Wenzhou Beipu Technology Co., Ltd., this case discloses "a needle for insulin injection", and its claims are as follows: it mainly includes a needle seat, a needle tube is arranged on the top of the needle seat, and it is characterized in that: an internal thread is arranged in the cavity of the needle seat, the diameter of the needle seat is 5mm-50mm, the needle tube is outer-connected with a needle tube protective sleeve, the needle seat is outer-connected with a needle seat protective sleeve, and a sealing dialysis paper is arranged at the lower opening of the needle seat protective sleeve.

[0003] Comparative Document 1 discloses a conventional insulin injection needle structure. The needle tips of existing conventional insulin syringes and pen-type insulin syringes are always exposed to the outside after use, which undoubtedly exposes safety issues. Moreover, the internal structure of existing insulin syringes also has defects and can be recycled and reused, which poses a safety hazard for medical accidents.

[0004] Comparative Document 2, Patent No.: CN201420663437.9, Application Date: 2014.11.10, Publication No.: CN204219537U, Publication Date: 2015.03.25, Patentee: Wenzhou Beipu Technology Co., Ltd., This case discloses a "disposable safe self-destructive insulin needle", and its claims are as follows: A needle seat (1) is provided in the insulin needle body, and the needle seat is cylindrical as a whole, and the inner cavity of the cylindrical needle seat (1) is hollow. A needle tube substrate (9) is provided in the cavity of the needle seat (1), and the needle tube substrate (9) divides the inner cavity of the needle seat (1) into an upper independent space (12) and a lower independent space (13), and the inner wall of the lower independent space (13) is disposed. An internal thread (20) is arranged, a spring fixing column (10) is arranged at the center of the upper surface of the needle tube substrate (9), the lower section of the spring fixing column (10) is located in the upper independent space (12), a needle tube (7) is arranged at the needle tube substrate (9), the needle tube (7) penetrates the needle tube substrate (9), one end of the needle tube (7) penetrates the spring fixing column (10) located at the center of the needle tube substrate (9) and then extends upward, the other end of the needle tube (7) penetrates the needle tube substrate (9) and then extends into the lower independent space (13), both ends of the needle tube (7) are thorn-shaped, at least one elastic sheet (11) is distributed on the inner wall of the upper independent space (12) of the needle tube (7), and the elastic sheet (11) is obliquely arranged on the inner wall of the inner cavity of the needle tube (7). One end of the elastic sheet (11) is connected to the inner wall of the inner cavity of the needle tube (7), and the other end of the elastic sheet (11) is suspended, and the suspended end points to the upper surface of the needle tube substrate (9) near the center. The spring fixing column (10) is sleeved with a spring (6) on the outside, and one end of the spring (6) is pressed downward against the upper surface of the needle tube substrate (9), and the other end of the spring (6) is pressed upward against the safety sheath (5). A safety card seat (4) is sleeved at the upper end of the needle seat (1), and the lower end of the safety card seat (4) is sleeved with the upper end of the needle seat (1), and a safety sheath (5) is provided at the upper end of the safety card seat (4). The safety card seat (4) is cylindrical as a whole, and the inner cavity of the safety card seat (4) is hollow. The inner edge of the upper end opening of the safety card seat (4) is formed The annular limiting portion (14) and the safety sleeve (5) are also cylindrical in shape as a whole. The inner cavity of the safety sleeve (5) is hollow. An annular limiting protrusion (15) cooperating with the annular limiting portion (14) is formed at the outer edge of the lower opening of the safety sleeve (5). The annular limiting protrusion (15) is located in the cavity of the safety seat (4) below the annular limiting portion (14). The upper end surface of the annular limiting protrusion (15) can be pressed downward against the lower end surface of the annular limiting portion (14). The outer edge of the lower opening of the safety sleeve (5) and the inner edge of the upper opening of the safety seat (4) are mutually limited and sleeved. The outer portion of the spring (6) is sleeved with a self-destructing pressure seat (3). The self-destructing pressure seat (3) is cylindrical in shape as a whole. The inner cavity of the self-destructing pressure seat (3) is hollow.The outer diameter of the upper section of the self-destructing pressure seat (3) is smaller than the outer diameter of the lower section of the self-destructing pressure seat (3); an annular limiting step (16) is formed between the upper section and the lower section of the self-destructing pressure seat (3); the outer diameter of the lower section of the self-destructing pressure seat (3) is larger than the diameter of the inner cavity of the safety sheath (5); the outer diameter of the upper section of the self-destructing pressure seat (3) is smaller than or equal to the diameter of the inner cavity of the safety sheath (5); the upper section of the self-destructing pressure seat (3) is located in the cavity of the safety sheath (5); the end surface of the annular limiting step (16) is upwardly pressed against the end surface of the lower end of the safety sheath (5); the lower section of the self-destructing pressure seat (3) is An annular protrusion (17) is formed on the outer wall of the part to cooperate with the elastic sheet (11), and the vertical distance between the annular protrusion (17) and the needle tube (7) is greater than the vertical distance between the suspended end of the elastic sheet (11) and the needle tube (7). The upper end of the safety sheath (5) is in a closed state, and a circular hole (18) is opened at the closed end surface. The diameter of the circular hole (18) is smaller than the diameter of the upper end of the spring (6). The upper end of the spring (6) is upwardly pressed against the inner surface of the upper end surface of the safety sheath (5), and the end surface of the lower end of the needle seat (1) is covered with dialysis paper (8).

[0005] Comparative Document 2 discloses a disposable safe self-destructing insulin needle, which includes an insulin needle body, a needle seat is provided inside the insulin needle body, a spring fixing column is provided at the center of the upper surface of the needle tube substrate of the needle seat, at least one elastic sheet is distributed on the inner wall of the upper part of the needle tube, and the elastic sheet is obliquely arranged on the inner wall of the inner cavity of the needle tube, and a spring is sleeved on the outside of the spring fixing column, one end of the spring is pressed against the upper surface of the needle tube substrate downward, and the other end of the spring is pressed against the safety sheath upward, and a safety seat is provided at the lower end of the safety sheath, and a self-destructing pressure seat is sleeved on the outside of the spring, and the upper section of the self-destructing pressure seat is located in the cavity of the safety sheath. The product adopts a sleeve-type linkage structure, and uses the spring at the central axis to achieve instantaneous reset of the safety sheath to ensure that the needle tube will not be exposed. Further, the elastic sheets distributed unevenly on the inner wall of the needle seat are used to achieve the deflection and tilt of the self-destructing pressure seat, which ultimately ensures that the insulin needle cannot be used a second time and realizes the safe self-destruction operation of the insulin needle. Utility Model Content

[0006] The utility model provides an injection needle to solve the problem that the end of the existing needle tube has no effective protection, avoids the safety problem of the needle tube after the injection is completed, and realizes the self-destruction function of the injection needle through a self-destruction structure, effectively preventing the injection needle from being used twice, and eliminating all safety hazards.

[0007] In order to solve the above technical problems, the utility model discloses the following technical solutions:

[0008] The utility model provides an injection needle, comprising a needle seat, a clamping seat and a protective cover.

[0009] The needle seat includes a base, a mounting column and three arc-shaped side plates, the mounting column is fixed to the top of the base and the central axis of the mounting column coincides with the central axis of the base, a needle tube is installed on the mounting column, one end of the arc-shaped side plate is fixed to the top of the base, the other end of the arc-shaped side plate is stepped, and the other end of the arc-shaped side plate includes a first end and a second end, the second end protrudes from the first end, and the three arc-shaped side plates surround a cylindrical space, and the mounting column is arranged in the cylindrical space; the cartridge is tubular and installed in the cylindrical space, the cartridge is sleeved on the outer surface of the mounting column and the inner surface of the cartridge is attached to the outer surface of the mounting column, and the outer surface of the cartridge is attached to the arc-shaped side plate; the protective cover includes a circular ring, and the protective cover is sleeved on the outer surface of the cartridge through the circular ring, and the inner surface of the circular ring is provided with three ratchet teeth, and the two sides of the ratchet teeth are respectively a curved side and a concave side.

[0010] Furthermore, a channel is formed between two adjacent arc-shaped side plates.

[0011] Furthermore, a first guide bevel is provided on the side of the first end of the arcuate side panel away from the second end of the arcuate side panel, and the first guide bevel is located at the angle between the side of the first end away from the second end and the top of the first end, and the first guide bevel is close to the top of the first end.

[0012] Furthermore, a second guide bevel is provided on the side of the first end of the arcuate side panel away from the second end of the arcuate side panel, the second guide bevel is located at the angle between the side of the first end away from the second end and the top of the first end, and the second guide bevel is close to the side of the first end away from the second end, and the second guide bevel is arranged adjacent to the first guide bevel.

[0013] Furthermore, a strip-shaped groove is provided on the outer surface of the arc-shaped side plate, and the ratchet is engaged in the strip-shaped groove.

[0014] Furthermore, an annular groove is provided on the outer surface of the holder, the annular groove is provided at one end of the holder away from the base, and the annular member is clamped in the annular groove.

[0015] Furthermore, the circular ring member also includes three circle-embracing structures, which are arranged on the inner side of the circular ring member, and each circle-embracing structure is arranged between two adjacent ratchet teeth of the circular ring member.

[0016] Furthermore, a first annular wall is provided on the inner wall of one end of the holder close to the base, and more than two notches are provided on the outer side of the mounting column close to the base, and the first annular wall is clamped in the notches.

[0017] Furthermore, a second annular wall is provided on the outer wall of one end of the holder away from the base.

[0018] Furthermore, the injection needle also includes a protective shell and a sealing dialysis paper. The protective shell is sleeved on the injection needle, and the sealing dialysis paper is attached to the opening at the bottom of the protective shell.

[0019] Compared with the prior art, the utility model has at least the following technical effects:

[0020] The utility model provides an injection needle, which is mainly used for insulin injection. The injection needle mainly comprises a needle seat, a cartridge and a protective sleeve, the cartridge is sleeved on the needle seat, the protective sleeve is sleeved on the cartridge, the needle seat comprises three arc-shaped side plates, one end of the arc-shaped side plate is stepped, and one end of the arc-shaped side plate comprises a first end and a second end, the protective sleeve comprises a circular ring, the protective sleeve is sleeved on the outer surface of the cartridge through the circular ring, three ratchets are arranged on the inner surface of the circular ring, the two sides of the ratchets in the circular ring are respectively an arc surface side and a concave surface side, the second end can move from the arc surface side to the concave surface side, and cannot move from the concave surface side to the arc surface side, so as to ensure that the protective sleeve can only rotate clockwise but cannot rotate counterclockwise, so as to achieve self-destruction, so that the second end moves to the concave side of the ratchet, and the needle tube is located in the protective sleeve at this time, so that the injection needle cannot be reused, acupuncture is prevented, and safety hazards are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the injection needle according to an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the injection needle part according to an embodiment of the utility model;

[0024] Figure 3 The needle seat structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the exploded structure of the injection needle according to the embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the protective cover according to an embodiment of the utility model;

[0027] Figure 6 The needle seat structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0028] Figure 7 It is a longitudinal sectional view of the card holder described in the embodiment of the utility model.

[0029] The components in the figure are marked as follows:

[0030] 10 injection needle, 11 needle holder, 12 card holder, 13 protective cover, 14 protective shell, 15 sealing dialysis paper;

[0031] 111 base, 112 mounting column, 113 arc-shaped side plate, 114 first end, 115 second end, 116 cylindrical space, 117 channel, 118 first guide slope, 119 second guide slope, 1110 strip groove, 1111 notch, 1112 needle tube;

[0032] 121 annular groove, 122 first annular wall, 123 second annular wall;

[0033] 131 circular ring, 132 ratchet teeth, 133 arc surface side, 134 concave surface side, 135 circular embracing structure. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. Directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, upper surface, lower surface, side, top surface, bottom, front end, rear end, end, etc., are only directions in the drawings and are only used to explain and illustrate the present invention, but not to limit the scope of protection of the present invention.

[0036] In the drawings, components with the same structure are indicated by the same numerical reference numerals. When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted to" or "connected to" another component, the two may be understood to be directly "mounted" or "connected", or one component may be indirectly "mounted to" or "connected to" another component through an intermediate component.

[0037] like Figure 1-Figure 2As shown, the utility model provides an injection needle 10, comprising a needle seat 11, a holder 12 and a protective cover 13, wherein the holder 12 is sleeved on the needle seat 11, and the protective cover 13 is slidably sleeved on the holder 12.

[0038] Furthermore, the injection needle 10 also includes a protective shell 14 and a sealing dialysis paper 15 . The protective shell 14 is sleeved on the injection needle 10 , and the sealing dialysis paper 15 is attached to an opening at the bottom of the protective shell 14 (not shown).

[0039] like Figure 3 As shown, the needle seat 11 includes a base 111, a mounting column 112 and three arc-shaped side plates 113. The mounting column 112 is fixed to the top of the base 111 and the central axis of the mounting column 112 coincides with the central axis of the base 111. A needle tube 1112 is installed on the mounting column 112. The needle tube 1112 passes through the mounting column 112. One end of the needle tube 1112 protrudes from the end of the mounting column 112 away from the base 111 and extends upward. The other end of the needle tube 1112 extends to the base 11 1, and the bottom of the base 111 is designed without a bottom surface, which is convenient for the injection needle 10 to be installed on the syringe, one end of the arc-shaped side plate 113 is fixed to the top of the base 111, and the other end of the arc-shaped side plate 113 is stepped, and the other end of the arc-shaped side plate 113 includes a first end 114 and a second end 115, and the second end 115 protrudes from the first end 114. The three arc-shaped side plates 113 surround a cylindrical space 116, and the mounting column 112 is arranged in the cylindrical space 116.

[0040] like Figure 4 As shown, the holder 12 is tubular and installed in the cylindrical space 116 . The holder 12 is sleeved on the outer surface of the mounting column 112 and the inner surface of the holder 12 is attached to the outer surface of the mounting column 112 . The outer surface of the holder 12 is attached to the arc-shaped side plate 113 .

[0041] like Figure 5 As shown, the protective sleeve 13 includes a circular ring member 131, and the protective sleeve 131 is sleeved on the outer surface of the cartridge 12 through the circular ring member 131, and the protective sleeve 131 can slide on the outer surface of the cartridge 12 toward the extension direction of the cartridge 12 through the circular ring member 131, and three ratchet teeth 132 are provided on the inner surface of the circular ring member 131, and the two sides of the ratchet teeth 132 are respectively on the arc side 133 and the concave side 134, and the second end 115 can move from the arc side 133 to the concave side 134, and cannot move from the concave side 134 to the arc side 133, ensuring that the protective sleeve 13 can only rotate clockwise on the outer surface of the cartridge 12, and cannot rotate counterclockwise, thereby realizing the self-destruction of the injection needle 10, ensuring that the injection needle 10 can only be used once, and avoiding safety hazards.

[0042] Another example Figure 3As shown, a channel 117 is formed between two adjacent arcuate side panels 113. Specifically, the arcuate side panel 113 body corresponding to the first end 114 of one arcuate side panel 113 and the arcuate side panel 113 body corresponding to the second end 115 of another adjacent arcuate side panel 113 form a channel 117, and the protective cover 13 can slide in the channel 117 along the extension direction of the channel 117 through the circular ring 131.

[0043] like Figure 6 As shown, a first guide slope 118 is provided on the side of the first end 114 of the arc-shaped side panel 113 away from the second end 115 of the arc-shaped side panel 113 , and the first guide slope 118 is located at the angle between the side of the first end 114 away from the second end 115 and the top of the first end 114 , and the first guide slope 118 is close to the top of the first end 114 .

[0044] Furthermore, a second guide bevel 119 is provided on the side of the first end 114 of the arcuate side plate 113 away from the second end 115 of the arcuate side plate 113, and the second guide bevel 119 is located at the angle between the side of the first end 114 away from the second end 115 and the top of the first end 114, and the second guide bevel 119 is close to the side of the first end 114 away from the second end 115, that is, the second guide bevel 119 is close to the side of the first end 114 of the arcuate side plate 113, and the second guide bevel 119 is adjacent to the first guide bevel 118, that is, the first guide bevel 118 and the second guide bevel 119 have a common edge, so that the injection needle 10 can be smoothly rotated clockwise after use to achieve self-destruction of the injection needle 10.

[0045] Furthermore, a strip groove 1110 is provided on the outer surface of the arcuate side plate 113, and the extension direction of the strip groove 1110 is consistent with the extension direction of the arcuate side plate 113, and the ratchet 132 is engaged with the strip groove 1110. Specifically, the strip groove 1110 is located on the outer side of the arcuate side plate 113, and the strip groove 1110 is located at the connection between the arcuate side plate 113 body corresponding to the first end 114 of the arcuate side plate 113 and the arcuate side plate 113 body corresponding to the second end 115 of the arcuate side plate 113, to ensure that the ratchet 132 of the injection needle 10 is engaged with the strip groove 1110 in the initial state, to prevent the protective cover 13 from rotating autonomously in the initial state and without external force, thereby affecting the use of the injection needle 10.

[0046] Another example Figure 4As shown, an annular groove 121 is provided on the outer surface of the cartridge 12, and the annular groove 121 is provided at one end of the cartridge 12 away from the base 111. The circular ring 131 is stuck in the annular groove 121 to prevent the protective cover 13 from falling off in the absence of external force, thereby affecting the use of the injection needle 10. The circular ring 131 is stuck in the annular groove 121, so that the needle is always located in the protective cover 13 to prevent the needle from being exposed, and when the protective cover 13 is subjected to downward force, the annular groove 121 and the circular ring 131 are disengaged, which can prompt the user that the protective cover 13 begins to be subjected to force and slides along the channel 117 toward the base 111, thereby improving the user experience.

[0047] Another example Figure 5 As shown, the circular ring 131 also includes three embracing structures 135, which are arranged on the inner side of the circular ring 131, and each embracing structure 135 is arranged between two adjacent ratchet teeth 132 of the circular ring 131. In the initial state, the embracing structure 135 abuts against the annular groove 121 on the outer surface of the holder 12, thereby increasing the stability of the overall structure of the injection needle 10. When the embracing structure 135 is disengaged from the annular groove 121 and the protective cover 13 is pressed, the embracing structure 135 begins to slide along the channel 117 toward the base 111 until the needle of the needle tube 1112 is exposed in the protective cover 13.

[0048] like Figure 3 as well as Figure 7 As shown, a first annular wall 122 is provided on the inner wall of one end of the card holder 12 close to the base 111, and more than two notches 1111 are provided on the outer side of the mounting column 112 close to the base 111. The first annular wall 122 is stuck in the notches 1111 to prevent the card holder 12 from detaching from the mounting column 112.

[0049] Furthermore, a second annular wall 123 is provided on the outer wall of one end of the holder 12 away from the base 111. When the injection needle 10 is in the initial state, the top of the embracing structure 135 abuts against the second annular wall 123 to prevent the protective cover 13 from detaching from the holder 12, thereby increasing the stability of the overall structure of the injection needle 10. When the injection needle 10 is used up and the protective cover 13 is rotated clockwise, the embracing structure 135 is located between the first end 114 of the arc-shaped side plate 113 and the second annular wall 123. Since the protective cover 13 cannot rotate counterclockwise, the embracing structure 135 is stably stuck between the first end 114 of the arc-shaped side plate 113 and the second annular wall 123, so that the needle tip of the needle tube 1112 is located in the protective cover 13, so that the injection needle 10 cannot be used again, thereby realizing the self-destruction of the device.

[0050] In the application scenario of this embodiment, for example, in the initial state, the injection needle 10 is installed on the syringe, the protective cover 13 is pressed against the human skin, and the injection needle 10 is pressed to make the three circular structures 135 of the protective cover 13 disengage from the annular groove 121, and the circular structure 135 begins to slide along the channel 117 in the direction close to the base 111 until the needle tube 1112 penetrates the human skin. After the injection is completed, the protective cover 13 is pulled upward by external force, and the protective cover 13 is rotated clockwise, so that the circular structure 135 is moved along the first guide slope 118 of the arc-shaped side plate 113 and ... The second guide slope 119 moves to the first end 114 of the arcuate side plate 113, and the second end 115 of the arcuate side plate 113 moves from the arcuate side 133 of the ratchet 132 to the concave side 134, and the second end 115 of the arcuate side plate 113 is engaged between the concave side 134 of the ratchet 132 and a circular structure 135, and the circular structure is stably located between the first end 114 of the arcuate side plate 113 and the second annular wall 123, so that the needle head of the needle tube 1112 is located in the protective cover 13, so that the injection needle 10 cannot be used again, thereby realizing the self-destruction of the device.

[0051] The utility model has the advantage of providing an injection needle, which is mainly used for insulin injection. The injection needle mainly comprises a needle seat, a holder and a protective sleeve. The holder is sleeved on the needle seat, and the protective sleeve is sleeved on the holder. The needle seat comprises three arcuate side panels, one end of the arcuate side panel is stepped, and one end of the arcuate side panel comprises a first end and a second end. The protective sleeve comprises a circular ring member, and the protective sleeve is sleeved on the outer surface of the holder through the circular ring member. Three ratchets are arranged on the inner surface of the circular ring member. The two sides of the ratchets in the circular ring member are respectively an arcuate side and a concave side. The second end can move from the arcuate side to the concave side, but cannot move from the concave side to the arcuate side, so as to ensure that the protective sleeve can only rotate clockwise but cannot rotate counterclockwise, so as to achieve self-destruction, so that the second end moves to the concave side of the ratchet. At this time, the needle tube is located in the protective sleeve, so that the injection needle cannot be reused, acupuncture is prevented, and safety hazards are avoided.

[0052] The above is a detailed introduction to an injection needle provided in an embodiment of the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the utility model. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An injection needle, characterized in that: include: A needle holder, comprising a base, a mounting post and three arc-shaped side panels, wherein the mounting post is fixed to the top of the base and the central axis of the mounting post coincides with the central axis of the base, a needle tube is mounted to the mounting post, one end of the arc-shaped side panel is fixed to the top of the base, the other end of the arc-shaped side panel is stepped, and the other end of the arc-shaped side panel comprises a first end and a second end, the second end protrudes from the first end, the three arc-shaped side panels enclose a cylindrical space, and the mounting post is arranged in the cylindrical space; A card holder, which is tubular and installed in the cylindrical space, wherein the card holder is sleeved on the outer surface of the mounting column and the inner surface of the card holder is attached to the outer surface of the mounting column, and the outer surface of the card holder is attached to the arc-shaped side plate; as well as The protective sleeve comprises a circular ring, and the protective sleeve is sleeved on the outer surface of the holder through the circular ring. The inner surface of the circular ring is provided with three ratchets, and the two sides of the ratchets are respectively an arc surface side and a concave surface side.

2. The injection needle according to claim 1, characterized in that A channel is formed between two adjacent arc-shaped side plates.

3. The injection needle according to claim 1, characterized in that: A first guiding slope is provided on the side of the first end of the arc-shaped side plate away from the second end of the arc-shaped side plate, and the first guiding slope is located at the angle between the side of the first end away from the second end and the top of the first end, and the first guiding slope is close to the top of the first end.

4. The injection needle according to claim 3, characterized in that: A second guide slope is provided on the side of the first end of the arc-shaped side plate away from the second end of the arc-shaped side plate, the second guide slope is located at the angle between the side of the first end away from the second end and the top of the first end, and the second guide slope is close to the side of the first end away from the second end, and the second guide slope is arranged adjacent to the first guide slope.

5. The injection needle according to claim 1, characterized in that: A strip-shaped groove is provided on the outer surface of the arc-shaped side plate, and the ratchet is engaged in the strip-shaped groove.

6. The injection needle according to claim 1, characterized in that: An annular groove is provided on the outer surface of the holder. The annular groove is provided at one end of the holder away from the base. The annular member is clamped in the annular groove.

7. The injection needle according to claim 1, characterized in that: The circular ring also includes three circle-embracing structures, which are arranged on the inner side of the circular ring, and each circle-embracing structure is arranged between two adjacent ratchet teeth of the circular ring.

8. The injection needle according to claim 1, characterized in that: A first annular wall is provided on the inner wall of one end of the holder close to the base, and more than two notches are provided on the outer side of the mounting column close to the base, and the first annular wall is clamped in the notches.

9. The injection needle according to claim 1, characterized in that: A second annular wall is provided on the outer wall of one end of the holder away from the base.

10. The injection needle according to claim 1, characterized in that: Also includes A protective shell, sleeved on the injection needle; and The sealing dialysis paper is attached to the opening at the bottom of the protective shell.

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