Blood taking needle

Abstract

The utility model discloses a blood taking needle. The blood taking needle comprises a sleeve, a needle tube assembly and a first locking mechanism. A mounting cavity is formed in the sleeve; the needle tube assembly is movably arranged in the mounting cavity and is provided with a first position where a needle tip of the needle tube assembly extends out of the sleeve and a second position where the needle tip retracts into the sleeve; the first locking mechanism is arranged between the sleeve and the needle tube assembly and has a locking state for limiting the needle tube assembly to move from the first position to the second position and an unlocking state for allowing the needle tube assembly to move. During blood collection, the needle tube assembly is located at the first position, the first locking mechanism locks and limits the needle tube assembly to move from the first position to the second position, and the needle tip is exposed out of the sleeve for blood collection; after blood sampling, the first locking mechanism is unlocked, the needle tube assembly drives the needle tip to retract into the sleeve, and therefore the blood sampling needle can be prevented from being exposed outside, and medical staff are prevented from being punctured by the used blood sampling needle.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to blood collection needles. Background Technology

[0002] Venous blood collection is a common clinical medical procedure, which involves collecting venous blood from the human body for sample testing to detect related diseases.

[0003] Blood collection needles are among the most widely used medical devices in medical institutions.

[0004] In related technologies, blood collection needles exposed to the outside after use can injure medical personnel and increase the risk of occupational exposure. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a blood collection needle in which, during blood collection, a first locking mechanism locks and limits the movement of the needle assembly from a first position to a second position, with the needle tip exposed in the sleeve for blood collection; after blood collection, the first locking mechanism unlocks, and the needle assembly retracts the needle tip into the sleeve, thereby preventing the blood collection needle from being exposed and thus preventing injury to medical personnel from the used needle.

[0006] This embodiment provides a blood collection needle, which includes a sleeve, a needle assembly, and a first locking mechanism. The sleeve has a mounting cavity; the needle assembly is movably disposed in the mounting cavity, having a first position in which the needle tip of the needle assembly extends out of the sleeve and a second position in which it retracts into the sleeve; the first locking mechanism is disposed between the sleeve and the needle assembly, having a locked state that limits the movement of the needle assembly from the first position to the second position, and an unlocked state that allows the needle assembly to move.

[0007] In some embodiments, the first locking mechanism includes: a locking hole penetrating the side wall of the sleeve; and an elastic locking tongue disposed on the needle assembly, the elastic locking tongue being used to engage with the locking hole in a locked state.

[0008] In some embodiments, the resilient latch has a latch body and a spring arm offset radially outward along the needle assembly, the latch body being connected to the needle assembly via the spring arm.

[0009] In some embodiments, a reset mechanism is further included, which is configured to drive the needle assembly to move from a first position to a second position when the first locking mechanism is in the unlocked state.

[0010] In some embodiments, the reset mechanism includes a reset spring disposed between the needle assembly and the mounting cavity wall.

[0011] In some embodiments, a second locking mechanism is further included, wherein the first locking mechanism and the second locking mechanism are arranged axially spaced apart along the sleeve; the second locking mechanism is used to limit the movement of the needle assembly toward the first position when the needle assembly is in the second position.

[0012] In some embodiments, the second locking mechanism includes a radial protrusion disposed on the needle assembly; a limiting groove disposed on the wall of the mounting cavity; and when the needle assembly reaches the second position, the radial protrusion and the limiting groove form a snap-fit ​​engagement.

[0013] In some embodiments, at least a portion of the radial protrusion and the resilient locking tongue are located at opposite ends of the needle assembly in the radial direction.

[0014] In some embodiments, the radial protrusion is configured as a rod-ring structure arranged axially around the needle assembly.

[0015] In some embodiments, the sleeve has a guide tube clearance hole and a needle tip clearance hole at both ends, respectively, which communicate with the mounting cavity; the needle assembly includes a needle seat and a guide tube, the needle tip and the guide tube are respectively disposed at both ends of the needle seat and correspond to the guide tube clearance hole and the needle tip clearance hole respectively; the circumferential edge of the guide tube clearance hole has a limiting protrusion extending towards its center, the limiting protrusion is used to abut against the needle seat to limit the needle seat in the mounting cavity; the limiting protrusion is heat-welded to the sleeve.

[0016] As can be seen from the technical solution, the embodiments provided by this utility model have the following advantages:

[0017] (1) When using this blood collection needle to collect blood, the needle assembly is in the first position, the first locking mechanism is in the locked state, and the first locking mechanism limits the needle assembly to move from the first position to the second position, that is, the needle tip of the needle assembly extends out of the sleeve and cannot be retracted into the sleeve. At this time, the medical staff can insert the needle tip into the body of the person being tested by holding the outer wall of the sleeve.

[0018] (2) After blood collection, the first locking mechanism switches to the unlocked state, the needle assembly can move to the second position, and the needle tip retracts into the sleeve, thereby preventing the blood collection needle from being exposed and thus preventing the blood collection needle from pricking medical personnel after use, thereby improving the safety of the blood collection needle. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the blood collection needle according to an embodiment of the present invention when the needle assembly is in the first position;

[0021] Figure 2 This is a schematic diagram of the structure of the blood collection needle according to an embodiment of the present invention when the needle assembly is in the second position.

[0022] Figure label:

[0023] 100 blood collection needles;

[0024] Sleeve 1, mounting cavity 11, needle tip clearance hole 12, guide tube clearance hole 13, limiting protrusion 131;

[0025] Needle assembly 2, needle tip 21, needle hub 22, catheter 23;

[0026] First locking mechanism 3, keyhole 31, elastic latch 32, spring arm 321, latch body 322;

[0027] Reset mechanism 4;

[0028] Second locking mechanism 5, limiting groove 51, radial protrusion 52. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The following is for reference. Figures 1-2 Description of a blood collection needle 100 according to an embodiment of the present invention.

[0033] Please see Figure 1 and Figure 2 This utility model embodiment provides a blood collection needle 100, which includes a sleeve 1, a needle assembly 2 and a first locking mechanism 3.

[0034] The sleeve 1 has an installation cavity 11.

[0035] The needle assembly 2 is disposed within the mounting cavity 11 and is movable between a first position and a second position within the mounting cavity 11. In the first position, the needle tip 21 of the needle assembly 2 extends out of the sleeve 1; in the second position, the needle tip 21 of the needle assembly 2 retracts into the sleeve 1.

[0036] In a specific example, the sleeve 1 may have an open end in its axial direction, which communicates with the mounting cavity 11, so that the needle tip 21 of the needle assembly 2 can extend out of the sleeve 1 through the open end or retract into the sleeve 1 through the open end. The needle tip 21 is located at one end of the needle assembly 2 in its own axial direction, and the needle tip 21 is opposite to the open end of the sleeve 1. The mounting cavity 11 extends generally in the axial direction, and the needle assembly 2 can move axially within the mounting cavity 11.

[0037] The first locking mechanism 3 is located between the sleeve 1 and the needle assembly 2, and the first locking mechanism 3 has a locked state and an unlocked state.

[0038] When the first locking mechanism 3 is in the locked state, the first locking mechanism 3 limits the needle assembly 2 to move from the first position to the second position, that is, the needle tip 21 of the needle assembly 2 extends out of the sleeve 1 and cannot be retracted into the sleeve 1. At this time, medical personnel can insert the needle tip 21 into the body of the person being tested by holding the outer wall of the sleeve 1.

[0039] When the first locking mechanism 3 is in the unlocked state, the needle assembly 2 can move. At this time, the needle assembly 2 can drive the needle tip 21 from the first position to the second position. The needle tip 21 retracts into the sleeve 1, preventing the needle tip 21 from being exposed outside the sleeve 1 and injuring medical personnel, thereby improving the safety of the blood collection needle 100.

[0040] As can be seen from the technical solution, the embodiments provided by this utility model have the following advantages:

[0041] (1) When using the blood collection needle 100 to collect blood, the first locking mechanism 3 is in a locked state. The first locking mechanism 3 limits the needle tube assembly 2 to move from the first position to the second position, that is, the needle tip 21 of the needle tube assembly 2 extends out of the sleeve 1 and cannot be retracted into the sleeve 1. At this time, medical personnel can insert the needle tip 21 into the body of the person being tested by holding the outer wall of the sleeve 1.

[0042] (2) After blood collection, the first locking mechanism 3 is switched to the unlocked state, the needle assembly 2 can move to the second position, and the needle tip 21 retracts into the sleeve 1, thereby preventing the blood collection needle 100 from being exposed, thus preventing the used blood collection needle 100 from pricking medical personnel, thereby improving the safety of the blood collection needle 100.

[0043] Example 2

[0044] Please see Figure 1Furthermore, the first locking mechanism 3 includes a locking hole 31 and a resilient locking tongue 32. The locking hole 31 penetrates the side wall of the sleeve 1, and the resilient locking tongue 32 is disposed on the needle assembly 2. The resilient locking tongue 32 can be engaged in the locking hole 31 in the locked state. The locking hole 31 communicates with the mounting cavity 11 through the side wall of the sleeve 1. Thus, when the first locking mechanism 3 is in the locked state, a portion of the locking tongue passes through the mounting cavity 11 and the side wall of the sleeve 1, and the locking tongue engages in the locking hole 31 on the side wall of the sleeve 1 to limit the movement of the needle assembly 2 from the first position to the second position. When the first locking mechanism 3 is in the unlocked state, the resilient locking tongue 32 exits from the locking hole 31 on the side wall of the sleeve 1 and further retracts into the mounting cavity 11 to release the limitation. That is to say, medical personnel can use their fingers or tools to press the resilient locking tongue 32 through the locking hole 31, causing the resilient locking tongue 32 to retract into the mounting cavity 11, and the needle assembly 2 can move from the first position to the second position. Therefore, by setting the keyhole 31 and the elastic locking tongue 32, medical personnel can unlock the sleeve 1 from the outside, improving the convenience of unlocking the first locking mechanism 3.

[0045] Please see Figure 1 and Figure 2 Furthermore, the elastic locking tongue 32 includes a spring arm 321 and a locking tongue body 332. The spring arm 321 is connected between the locking tongue body 332 and the needle assembly 2. The spring arm 321 applies an elastic force to the locking tongue body 332, and the direction of the elastic force is radially outward along the needle assembly 2. Thus, when the needle assembly 2 is in the first position, the spring arm 321 can push the locking tongue body 332 radially outward of the needle assembly 2, thereby locking the locking tongue body 332 into the locking hole 31. Thus, the structure of the spring arm 321 and the locking tongue body 332 can improve the stability and reliability of the locking of the first locking mechanism 3. When unlocking, the medical personnel can push the locking tongue body 332 from the outer wall of the sleeve 1, and the locking tongue body 332 retracts into the mounting cavity 11, allowing the needle assembly 2 to move from the first position to the second position.

[0046] Please see Figure 1 and Figure 2 In a specific example, the latch body 332 is configured as a latching protrusion connected to the side of the spring arm 321 opposite to the radial side of the needle assembly 2. The latching protrusion abuts against the sidewall of the locking hole 31 to apply an axial abutting force to the needle assembly 2. The direction of the axial abutting force is at least opposite to the direction of movement from the first position to the second position.

[0047] Please see Figure 1 and Figure 2 Furthermore, the blood collection needle 100 also includes a reset mechanism 4. When the first locking mechanism 3 is in the unlocked state, the reset mechanism 4 drives the needle assembly 2 to move from the first position to the second position. By setting the reset mechanism 4, the needle assembly 2 can automatically move from the first position to the second position, further improving the convenience of the blood collection needle 100.

[0048] Please see Figure 1 and Figure 2 Furthermore, the reset mechanism 4 includes a reset spring, one end of which is connected to the needle assembly 2, and the other end of which is connected to the wall of the mounting cavity 11. When the reset spring is compressed or stretched, it applies an elastic force to the needle assembly 2, the direction of which is from the first position to the second position.

[0049] Example 3

[0050] Please see Figure 1 and Figure 2 Furthermore, the blood collection needle 100 also includes a second locking mechanism 5, with the first locking mechanism 3 and the second locking mechanism 5 arranged axially spaced along the sleeve 1. When the needle assembly 2 is in the second position, the second locking mechanism 5 limits the movement of the needle assembly 2 to the first position. By setting the second locking mechanism 5, the needle assembly 2 is locked in the second position after blood collection, preventing the needle tip 21 from accidentally protruding from the sleeve 1.

[0051] Please see Figure 1 and Figure 2 Furthermore, the second locking mechanism 5 includes a radial protrusion 52 and a limiting groove 51. The radial protrusion 52 is disposed on the needle assembly 2, and the limiting groove 51 is formed on the cavity wall of the mounting cavity 11; when the needle assembly 2 reaches the second position, the radial protrusion 52 and the limiting groove 51 form a snap-fit ​​engagement.

[0052] Please see Figure 1 and Figure 2 The first locking mechanism 3 and the second locking mechanism 5 are arranged axially along the sleeve 1 at intervals, meaning that the needle tip 21, the radial protrusion 52, and the elastic locking tongue 32 are spaced apart axially in the needle tube assembly 2. In the first position, the elastic locking tongue 32 and the locking hole 31 are axially opposite, and the radial protrusion 52 and the limiting groove 51 are axially offset; in the second position, the elastic locking tongue 32 and the locking hole 31 are axially offset, and the radial protrusion 52 and the limiting groove 51 are axially opposite.

[0053] Please see Figure 1 and Figure 2 The limiting groove 51 and the locking hole 31 can be set according to the relative position of the needle tube assembly 2 and the sleeve 1. When the needle tip 21 of the needle holder 22 assembly is outside the sleeve 1 and the needle holder 22 assembly is in the first position, a hole is made according to the axial position of the elastic locking tongue 32 on the needle holder 22 assembly relative to the sleeve 1. This hole is the locking hole 31. The axial position of the elastic locking tongue 32 inside the sleeve 1 determines the position of the locking hole 31. That is to say, the position of the locking hole 31 on the sleeve 1 is determined according to the position of the elastic locking tongue 32 on the needle holder 22 assembly to ensure that the two are aligned and locked in the correct position.

[0054] Please see Figure 1 and Figure 2 When the needle tip 21 of the needle holder 22 assembly retracts into the sleeve 1 and the needle holder 22 assembly is in the first position, a hole is made according to the axial position of the radial protrusion 52 on the needle holder 22 assembly relative to the sleeve 1. This hole is a limiting groove 51. The axial position of the radial protrusion 52 within the sleeve 1 determines the position of the limiting groove 51. In other words, the position of the groove on the sleeve 1 is determined based on the position of the protrusion on the needle holder 22 assembly to ensure that the two are aligned and locked in the correct position.

[0055] Example 4

[0056] Please see Figure 1 and Figure 2 Furthermore, at least a portion of the radial protrusion 52 and the elastic locking tongue 32 are located at opposite ends of the needle seat 22 assembly in the radial direction.

[0057] In conjunction with the above embodiment 2, after the first locking mechanism 3 is unlocked, the locking tongue body 332 is pushed into the mounting cavity 11. At this time, the locking tongue body 332 abuts against the cavity wall of the mounting cavity 11 under the action of the spring arm 321. The cavity wall of the mounting cavity 11 reacts to the needle seat 22 assembly through the elastic locking tongue 32 and pushes the other end of the needle seat 22 assembly to move radially, that is, pushes the radial protrusion 52 to move radially. When the needle seat 22 assembly moves to the second position, the cavity wall of the mounting cavity 11 reacts to the radial protrusion 52 through the elastic locking tongue 32 and pushes the radial protrusion 52 into the limiting groove 51.

[0058] Please see Figure 1 and Figure 2 Furthermore, the radial protrusion 52 is configured as a rod-ring structure arranged axially around the needle assembly 2. Thus, when the elastic locking tongue 32 retracts into the mounting cavity 11, the needle seat 22 assembly can easily rotate within the mounting cavity 11. By further configuring the radial protrusion 52 as a rod-ring structure arranged axially around the needle assembly 2, the radial protrusion 52 can still be engaged in the limiting groove after rotation.

[0059] Please see Figure 1 and Figure 2 Furthermore, the sleeve 1 has a guide tube clearance hole 13 and a needle tip clearance hole 12 at both ends, which are connected to the mounting cavity 11. The needle assembly 2 includes a needle seat 22 and a guide tube 23. The needle tip 21 and the guide tube 23 are respectively located at both ends of the needle seat 22 and correspond to the guide tube clearance hole 13 and the needle tip clearance hole 12, respectively. The circumferential edge of the guide tube clearance hole 13 has a limiting protrusion 131 extending towards its center. The limiting protrusion 131 is used to abut against the needle seat 22 to limit the needle seat 22 in the mounting cavity 11. The limiting protrusion 131 is heat-welded to the sleeve 1.

[0060] The needle tip clearance hole 12 here is the open opening described in Embodiment 1 above.

[0061] The following is based on Figures 1-2 Let me describe a specific implementation.

[0062] The blood collection needle 100 includes a sleeve 1, a needle assembly 2, a first locking mechanism 3, a second locking mechanism 5, and a return spring. The sleeve 1 has a mounting cavity 11, a needle tip clearance hole 12, and a catheter clearance hole 13. The needle tip clearance hole 12 and the catheter clearance hole 13 communicate with the mounting cavity 11. The needle tip clearance hole 12 is located at the first end of the sleeve 1 along its axial direction, and the catheter clearance hole 13 is located at the second end of the sleeve 1 along its axial direction. The mounting cavity 11 extends axially along the sleeve 1, and the needle assembly 2 can move within the mounting cavity 11, moving either from the first end to the second end or from the second end to the first end.

[0063] The needle assembly 2 extends axially along the cylinder and includes a connected needle hub 22, a needle tube, and a conduit 23. The needle tube is bonded to the needle hub 22 with photosensitive adhesive, and the needle hub 22 and the conduit 23 are bonded with medical adhesive. The end of the needle tube away from the needle hub 22 is the needle tip 21, which is opposite to the first end of the sleeve 1, and the conduit 23 is opposite to the second end of the sleeve 1.

[0064] The needle assembly 2 has a first position and a second position relative to the mounting cavity 11. In the first position, the needle tip 21 of the needle assembly 2 extends out of the sleeve 1 through the needle tip clearance hole 12. In the second position, the needle tip 21 of the needle assembly 2 retracts into the sleeve 1 through the needle tip clearance hole 12.

[0065] The needle holder 22 is constructed as a cylindrical structure.

[0066] The first locking mechanism 3 includes a locking hole 31 penetrating the side wall of the sleeve 1 and an elastic locking tongue 32 disposed on the needle seat 22. The elastic locking tongue 32 has a spring arm 321 and a locking tongue body 332. The spring arm 321 extends axially along the needle seat 22 and is radially spaced from the needle seat 22 so that the spring arm 321 can move closer to one side of the needle seat 22. The fixed end of the spring arm 321 is connected to the outer surface of the needle seat 22, and the free end of the spring arm 321 is connected to the locking tongue body 332.

[0067] When the first locking mechanism 3 is in the locked state, the bolt body 332 is located in the lock hole 31 to limit the movement of the needle tube assembly 2 from the first position to the second position; when the first locking mechanism 3 is in the unlocked state, the bolt body 332 retracts into the mounting cavity 11 to release the limit.

[0068] The outer circumferential surface of the needle holder 22 is also provided with a rod ring structure, and the needle tube, the rod ring structure and the locking tongue are arranged sequentially in the axial direction of the needle holder 22.

[0069] The inner wall of the mounting cavity 11 is provided with a limiting groove 51. When the needle seat 22 assembly is in the second position, the rod ring structure is used to engage in the limiting groove 51. The rod ring structure and the limiting groove 51 constitute the second locking mechanism 5.

[0070] The two ends of the return spring abut against the rod ring structure and the mounting cavity 11 respectively. The cavity wall at the first end is compressed. When the return spring is compressed, it applies an elastic force to the rod ring structure in the direction from the first end to the second end.

[0071] In this embodiment, when the blood collection needle 100 is installed, the needle hub 22, the needle tube and the catheter 23 are connected in sequence to form the needle tube assembly 2. The needle tube assembly 2 is inserted into the installation cavity 11 through the catheter clearance hole 13, so that the elastic locking tongue 32 cooperates with the locking hole 31. Finally, the second end of the sleeve 1 is heat-welded to form a limiting protrusion 131. The limiting protrusion 131 extends from the circumferential edge of the catheter clearance hole 13 toward the center.

[0072] Other components and operations of the blood collection needle 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The up-down direction, left-right direction, and front-back direction are defined as shown in the figures.

[0073] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Moreover, "above," "over," and "on top" of the second feature include the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A lancet, comprising: The application relates to a needle tube assembly and a sleeve. The sleeve (1) is provided with a mounting cavity (11); The needle tube assembly (2) is movably arranged in the mounting cavity (11) and has a first position in which a needle tip (21) of the needle tube assembly (2) extends out of the sleeve (1) and a second position in which the needle tip (21) is retracted into the sleeve (1); The first locking mechanism (3) is arranged between the sleeve (1) and the needle tube assembly (2) and has a locking state in which the needle tube assembly (2) is limited to move from the first position to the second position and an unlocking state in which the needle tube assembly (2) is allowed to move.

2. The lancet of claim 1 wherein, The first locking mechanism (3) comprises: A lock hole (31) penetrating through a side wall of the sleeve (1) and communicating with the mounting cavity (11); An elastic lock tongue (32) arranged on the needle tube assembly (2) and used for being clamped into the lock hole (31) in the locking state.

3. The lancet of claim 2 wherein, The elastic lock tongue (32) has a lock tongue body (332) and an elastic arm (321) which is biased along a radial outer side of the needle tube assembly (2), and the lock tongue body (332) is connected to the needle tube assembly (2) through the elastic arm (321).

4. The lancet of claim 3 wherein, The reset mechanism (4) is configured to drive the needle tube assembly (2) to move from the first position to the second position when the first locking mechanism (3) is in the unlocking state.

5. The lancet of claim 4 wherein, The reset mechanism (4) comprises a reset spring arranged between the needle tube assembly (2) and a cavity wall of the mounting cavity.

6. The lancet of claim 3 wherein, The second locking mechanism (5) is arranged axially along the sleeve (1) and spaced apart from the first locking mechanism (3); The second locking mechanism (5) is used for limiting the needle tube assembly (2) to move from the second position to the first position when the needle tube assembly (2) is located at the second position.

7. The lancet of claim 6 wherein, The second locking mechanism (5) comprises: A radial protruding part (52) arranged on the needle tube assembly (2); A limiting groove (51) arranged on the cavity wall of the mounting cavity; When the needle tube assembly (2) reaches the second position, the radial protruding part (52) and the limiting groove (51) are in clamping fit.

8. The lancet of claim 7 wherein, At least part of the radial protruding part (52) and the elastic lock tongue (32) are respectively located at two opposite ends of the needle tube assembly (2) in the radial direction.

9. The lancet of claim 7 or 8 wherein, The radial protruding part (52) is configured as a rod ring structure which is arranged axially around the needle tube assembly (2).

10. The lancet of claim 1 wherein, The sleeve (1) is provided with a catheter avoiding hole (13) and a needle tip avoiding hole (12) which respectively communicate with the mounting cavity (11) and are arranged at two ends of the sleeve (1); The needle tube assembly (2) comprises a needle seat (22) and a catheter (23), and the needle tip (21) and the catheter (23) are respectively arranged at two ends of the needle seat (22) and correspond to the catheter avoiding hole (13) and the needle tip avoiding hole (12); A limiting convex edge (131) is arranged on a circumferential edge of the catheter avoiding hole (13) and extends to the center of the catheter avoiding hole (13), and the limiting convex edge (131) is used for abutting against the needle seat (22) to limit the needle seat (22) in the mounting cavity (11); The limiting convex edge (131) is formed by heat welding with the sleeve (1).

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