A needle protection mechanism

Abstract

This application relates to the field of puncture needle accessories, and more particularly to a needle tip protection mechanism, including a base for mounting the needle tip, a needle cover, a first positioning structure, and a second positioning structure. The needle cover can switch between an open state and a closed state relative to the base. In the open state, the needle cover releases the needle body from its obstruction; in the closed state, the needle body is completely contained within the needle cover. The second positioning structure includes a protrusion and an elastic arm, which are offset from each other along the length of the needle cover. In the closed state, under the elastic pressure of the elastic arm, the needle body is pressed against the protrusion in a first direction to maintain stability. The first direction is perpendicular to the length of the needle cover. The elastic arm and the protrusion in the second positioning structure can press the needle body in the first direction, thus keeping the needle body stable. Therefore, even when the needle body is subjected to bumps or shaking, the needle body itself is less likely to swing, causing the needle tip to protrude from the needle cover.

Description

Technical Field

[0001] This application relates to the field of puncture needle accessories, and more particularly to a needle protection mechanism. Background Technology

[0002] Some puncture needles used in medical applications are typically equipped with a needle protection mechanism, which mainly includes a needle cover that can be opened and closed. When the needle body is not in use, the needle cover is in a closed state (or a covered state), covering the needle body to prevent accidental puncture to people or objects. During normal use, the needle cover is opened, removing the cover from the needle body and exposing it for puncture. For puncture needles equipped with such a protection mechanism, the technical solution described in the patent document disclosed in application number CN02815338.3 can be referred to.

[0003] However, this needle protection mechanism in the relevant technology still has some shortcomings in actual use. For example, although the needle cover can cover the needle when the needle cover is closed, some puncture needles have thin and long needle bodies, which cause the needle body to swing up and down when bumped or shaken. During the swinging process, the needle tip is easy to be exposed outside the needle cover, which may cause some accidental risks. Therefore, it still needs to be improved. Utility Model Content

[0004] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this application is to provide a needle protection mechanism.

[0005] To achieve the above objectives, this application provides the following technical solution.

[0006] A needle protection mechanism is provided for assembly onto a needle, the needle including a needle hub and a needle body disposed on the needle hub, the needle protection mechanism comprising: Base for mounting the needle; A needle cover is rotatably connected to a base about a first axis so that the needle cover can switch between an open state and a closed state relative to the base. In the open state, the needle cover releases the needle body from the cover; in the closed state, the needle body is completely contained within the needle cover. A first positioning structure is provided between the base and the needle cover, and is used to position the needle cover so that the needle cover is kept in the closed state when the needle cover is in the closed state. The second positioning structure, located inside the needle cover, is used to position the needle body. It includes a protrusion and an elastic arm. The protrusion and the elastic arm are staggered along the length of the needle cover. In the closed state, under the elastic pressure of the elastic arm, the needle body is pressed against the protrusion in a first direction to maintain stability. The first direction is perpendicular to the length of the needle cover. The elastic arm is configured such that when the needle cover flips from the open state to the closed state, the elastic arm can deflect to one side under the squeezing of the needle body to avoid the needle body, so that the needle body passes over the elastic arm and is pressed against the protrusion.

[0007] Compared with existing technologies, the advantages of this solution are: First, in this application, in the closed state, the first positioning structure can keep the entire needle tip stable. On this basis, the elastic arm and protrusion in the second positioning structure can press the needle body in the first direction, thus keeping the needle body stable. In this way, even if the needle body is bumped or shaken, the needle body itself is not likely to swing, causing the needle tip to be exposed from the needle cover.

[0008] Secondly, in this application, the protrusion and the elastic arm are misaligned, which ensures that when the needle cover is flipped to the closed state, the needle body can pass through the elastic arm and be pressed between the protrusion and the elastic arm.

[0009] In other words, if the protrusion and the elastic arm are in the same position, there is not enough space between the elastic arm and the protrusion for the needle body to deform, so the needle body cannot pass through the elastic arm normally; however, by setting them to be offset, the needle body has enough space to bend downwards on the opposite side of the elastic arm, so that the needle body can pass through the elastic arm normally.

[0010] As an optional embodiment of this application, the needle cover includes side plate portions located on opposite sides in a second direction, and the base is rotatably connected between the two side plate portions; the second direction is parallel to the first axis; the first positioning structure includes: The first snap-fit ​​component is provided on the inner side wall of the side plate portion. The side wall of the first snap-fit ​​component near the distal end of the needle cover has a snap-fit ​​groove recessed towards the proximal end of the needle cover. The second snap-fit ​​component is disposed on the base and has a snap-fit ​​head that can snap into a snap-fit ​​slot; when the needle cover is in the closed state, the snap-fit ​​head snaps into the snap-fit ​​slot to keep the needle cover in the closed state.

[0011] As an optional embodiment of this application, the card slot is an arc-shaped slot structure, and the end face of the card head facing the card slot is arc-shaped.

[0012] As an optional embodiment of this application, the sidewall of the first snap-fit ​​member near the proximal end of the needle cover is inclined to form a first guide surface for guiding the snap-fit ​​head into the snap-fit ​​slot. And / or the second snap-fit ​​member is inclined on the side wall opposite the snap-fit ​​head to form a second guide surface for guiding the snap-fit ​​head into the snap-fit ​​slot.

[0013] As an optional embodiment of this application, the needle cover includes a side plate portion located on opposite sides in a second direction and a top plate portion fixed between the two side plate portions, the needle cover being open on the side opposite to the top plate portion; the base is rotatably connected between the two side plate portions; the protrusion is fixed on the inner wall of the top plate portion, one end of the elastic arm is fixed on one of the side plate portions, and the elastic arm is inclined, the inclination direction being from the opening side of the needle cover to the top plate portion, the elastic arm gradually moving away from the side plate portion fixed thereto.

[0014] As an optional embodiment of this application, in the open state, the needle cover can be flipped relative to the base to the packaging position. In the packaging position, the needle cover has a pre-tightening force relative to the base, and under the action of the pre-tightening force, the needle cover has a tendency to flip towards the closed state.

[0015] As an optional embodiment of this application, the base includes a stop surface, and the needle cover includes a connecting portion corresponding to the stop surface. The needle cover is rotatably connected to the base through the connecting portion. The connecting portion has an outwardly convex arc-shaped surface. In the packaging position, the arc-shaped surface abuts against the stop surface to provide the pre-tightening force.

[0016] As an optional embodiment of this application, in the open state, the needle cover can be flipped relative to the base to at least a first position and a second position. In the first position, a first angle is formed between the needle cover and the base, and in the second position, a second angle is formed between the needle cover and the base; wherein, 60° ≥ the first angle ≥ 70°, 110° ≥ the second angle ≥ 120°, and the needle cover can be maintained in the first position and the second position when not subjected to external force.

[0017] As an optional embodiment of this application, the base includes a stop surface, and the needle cover includes a connecting portion corresponding to the stop surface. The needle cover is rotatably connected to the base through the connecting portion. A first positioning surface and a second positioning surface are sequentially formed along the circumferential direction on the outer peripheral wall of the connecting portion, and a protruding ridge is formed between the first positioning surface and the second positioning surface. In the first position, the first positioning surface abuts against the stop surface to keep the needle cover in the first position, and in the second position, the second positioning surface abuts against the stop surface to keep the needle cover in the second position.

[0018] As an optional embodiment of this application, the needle cover has an opening side for the needle body to enter the needle cover; the needle cover includes a top plate portion located on the opposite side of the opening side, the top plate portion having a through hole penetrating the top plate portion, and the elastic arm located at the through hole position.

[0019] Other advantages and effects of this application are explained in detail in the Detailed Description and Drawings sections.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0021] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0022] Figure 1 This diagram shows the structure of the present application with the needle cover in the closed state; Figure 2 A cross-sectional view of the present application is shown with the needle cover in the closed state; Figure 3 A partial structural schematic diagram of the needle cover of this application is shown; Figure 4 A schematic diagram of the structure of the base of this application is shown; Figure 5 A partial top view of this application is shown with the needle cover in the closed state; Figure 6 This diagram shows the structure of the present application with the needle cover in the packaged state; Figure 7 A cross-sectional view of this application is shown with the needle cover in the closed state; Figure 8 A cross-sectional view of the present application is shown with the needle cover in the packaged state; Figure 9 This paper shows a cross-sectional view of the present application when the needle cover is in the first position; Figure 10 This paper shows a cross-sectional view of the present application when the needle cover is in the second position; Figure 11 A cross-sectional view of the present application is shown when the needle cover is in the third position.

[0023] Explanation of the labels in the diagram: L1, first direction; L2, second direction; M, needle tip; M1, needle hub; M2, needle body; M3, needle sheath; 1. Base; 11. Connecting seat; 111. Stop surface; 12. Second snap-fit ​​component; 121. Snap-fit ​​head; 122. Second guide surface; 2. Needle cover; 21. Side plate; 211. Elastic arm; 22. Top plate; 221. Protrusion; 222. Through hole; 23. Connecting part; 231. First positioning surface; 232. Second positioning surface; 233. Arc-shaped surface; 234. First protruding ridge; 24. First snap-fit; 241. Slot; 242. First guide surface; 25. Shaft pin. Detailed Implementation

[0024] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In order to reduce the problem of the needle body of the puncture needle easily swinging up and down inside the needle cover, this application aims to provide a needle protection mechanism for assembly onto the needle.

[0026] The needle mainly consists of a needle hub and a needle body mounted on the needle hub. The needle body mainly refers to the puncture needle. The needle hub acts as an adapter for the needle body. In actual use, the needle body is attached to the syringe (such as the syringe barrel of a syringe) through the needle hub. There are specific applications and descriptions of this type of needle in the existing technology, which will not be elaborated here.

[0027] The needle is mounted on a needle protection mechanism, which protects the needle body and prevents it from piercing people or objects.

[0028] The needle protection mechanism includes: Base for mounting the needle; A needle cover is rotatably connected to a base about a first axis so that the needle cover can switch between an open state and a closed state relative to the base. In the closed state, the needle body is completely contained within the needle cover; in the open state, the needle cover releases its cover from the needle body. A first positioning structure is provided between the base and the needle cover, and is used to position the needle cover so that the needle cover is kept in the closed state when the needle cover is in the closed state. The second positioning structure, located inside the needle cover, is used to position the needle body. It includes a protrusion and an elastic arm. The protrusion and the elastic arm are staggered along the length of the needle cover. In the closed state, under the elastic pressure of the elastic arm, the needle body is pressed against the protrusion in a first direction to maintain stability. The first direction is perpendicular to the length of the needle cover. The elastic arm is configured such that when the needle cover flips from the open state to the closed state, the elastic arm can deflect to one side under the squeezing of the needle body to avoid the needle body, so that the needle body passes over the elastic arm and is pressed against the protrusion.

[0029] Example 1 like Figures 1-11 As shown, the needle protection mechanism mainly includes a needle cover 2 and a base 1; the base 1 mainly serves as the mounting carrier for the needle M. Specifically, the needle seat M1 of the needle M is installed in the base 1 by a through-and-clamp mechanism, as shown in the figure. Figure 4 As shown, a mounting hole is provided on the base 1 for the needle holder M1 body to pass through. After the needle holder M1 passes through the mounting hole, it is locked in the through hole.

[0030] The needle cover 2 is rotatably mounted on the base 1, allowing the needle cover 2 to switch between an open and closed state relative to the base 1. The relative axis of rotation between the two is denoted as the first axis, for example, as... Figure 3 As shown, the needle cover 2 is rotatably connected to the base 1 via the shaft pin 25, at which time the central axis of the shaft pin 25 is equivalent to the first axis.

[0031] like Figure 1 As shown, a specific needle cover 2 structure is provided. The needle cover 2 is a hollow needle cover structure, with an opening on one side for the needle body M2 to enter the needle cover. Specifically: Combination Figure 1 and Figure 2 As shown, the needle cover 2 mainly includes two side plates 21 and a top plate 22. The two side plates 21 are arranged opposite each other in the second direction L2, and the top plate 22 is fixed between the two side plates 21. Thus, the two side plates 21 and the top plate 22 together form a space with one side opening for accommodating the needle body M2. At this time, the two side plates 21 are equivalent to the side walls of the needle cover on both sides, and the top plate 22 is equivalent to the top wall of the needle cover 2. It is worth noting that the front end of the needle cover 2 is closed in the length direction (i.e., Figure 2 (The right end of the middle). In some embodiments, the needle cover 2 is a single piece.

[0032] Furthermore, the opening side of the needle cover is located on the opposite side of the top plate portion 22, such as... Figure 2As shown, the opening side is located on the upper side. For ease of explanation, in this embodiment, the relative direction between the opening side of the needle cover and the top plate 22 is referred to as the first direction L1. Specifically, in this embodiment, the first direction L1, the second direction L2 and the length direction of the needle cover 2 are mutually perpendicular, and the first axis is parallel to the second direction L2.

[0033] Among them, such as Figure 1 As shown, the distance between the two side plates 21 must be sufficient to accommodate the base 1, so that the base 1 can rotate around the first axis between the two side plates 21.

[0034] The specific rotational connection between base 1 and needle cover is as follows: like Figure 3 As shown, the needle cover has a protruding connecting portion 23 at the tail end. For example, the tail end portion of the top plate 22 extends rearward to form the connecting portion 23, and the shaft pin 25 is fixedly connected to the connecting portion 23 and parallel to the second direction L2.

[0035] Correspondingly, such as Figure 4 As shown, a connecting seat 11 is formed on the peripheral wall of the base 1. In some embodiments, the connecting seat 11 is generally U-shaped and is integrally constructed with the base 1. The pin 25 is rotatably connected to the connecting seat 11, thereby realizing the relative rotational connection between the needle cover 2 and the base 1.

[0036] The needle cover 2 can switch between an open state and a closed state by rotating circumferentially relative to the base 1, wherein: When the lid is closed, refer to Figure 1 and Figure 2 In the state shown, the needle body M2 is completely housed within the needle cover 2, and the needle cover 2 forms a shield for the needle body M2. In some embodiments, it is preferable that the needle body M2 is substantially parallel to the length direction of the needle cover 2 in the closed state.

[0037] In the open state, the needle cover 2 removes its cover from the needle body M2, which can also be understood as, referring to Figures 8-11 As shown, in the open state, the needle cover 2 is tilted at an angle relative to the base 1, so that the needle tip of the needle body M2 can be exposed.

[0038] In order to keep the needle cover 2 in a closed state relative to the base 1 when it is not subjected to external force, that is, to position the needle cover 2 in a closed state, this embodiment provides a first positioning structure, wherein the first positioning structure is a snap-fit ​​structure, and the positioning of the needle cover 2 and the base 1 is achieved by snap-fit.

[0039] like Figures 3-5 As shown, a specific first positioning structure is provided, which mainly includes a first latching member 24 and a second latching member 12. Wherein: like Figure 3As shown, the first snap-fit ​​member 24 is provided on the inner side wall of the side plate portion 21; as Figure 4 As shown, the second card connector 12 is disposed on the base 1. It is worth noting that the first card connector 24 and the second card connector 12 can be one or two, and the first card connector 24 and the second card connector 12 correspond one-to-one.

[0040] This embodiment specifically shows the case where two first snap-fit ​​members 24 and two second snap-fit ​​members 12 are provided. The two first snap-fit ​​members 24 are respectively provided on the inner sidewalls of the two side plate portions 21, and the two second snap-fit ​​members 12 are respectively fixed on both sides of the base 1.

[0041] For ease of explanation, in this embodiment, the end of the needle cover 2 closest to the shaft pin 25 is referred to as the proximal end, and correspondingly, the end opposite the proximal end of the needle cover 2 is referred to as the distal end.

[0042] Combination Figure 3 and Figure 5 As shown, the first snap-fit ​​member 24 has a snap-fit ​​groove 241 recessed towards the proximal end of the needle cover 2 on the side wall near the distal end of the needle cover 2. It can also be understood that the opening of the snap-fit ​​groove 241 faces the distal end of the needle cover 2.

[0043] Combination Figure 4 and Figure 5 As shown, the second snap-fit ​​member 12 has a snap-fit ​​head 121 that can snap into the snap-fit ​​slot 241; when the needle cover 2 is in the closed state, the snap-fit ​​head 121 snaps into the snap-fit ​​slot 241 to keep the needle cover 2 in the closed state.

[0044] In some embodiments, combined with Figure 5 As shown, the slot 241 is an arc-shaped slot structure, and the end face of the card head 121 facing the slot 241 is arc-shaped; the significance of this design is as follows: First, after the clip 121 is inserted into the clip slot 241, a certain locking force will be formed, so that the needle cover 2 can remain closed when it is not subjected to external force, that is, it cannot be flipped relative to the base 1. Secondly, the arc-shaped slot 241 and the locking head 121 cooperate to form a certain locking relationship in the second direction L2. That is, the locking head 121 is restricted by the slot 241 in the second direction L2, making it difficult for the locking head 121 to move in the slot 241 along the second direction L2. This allows the two side plates 21 to remain relatively stable in the second direction L2, making it difficult for the two side plates 21 to get closer or further apart in the second direction L2. This helps to improve the stability of the two side plates 21.

[0045] Furthermore, to ensure that the first latching member 24 can smoothly engage with the second latching member 12 when flipped from the open state to the closed state, in some embodiments, such as Figure 3 and Figure 5 As shown, the side wall of the first snap-fit ​​member 24 near the proximal end of the needle cover 2 is inclined to form a first guide surface 242 for guiding the snap-fit ​​head 121 into the snap-fit ​​slot 241. It can also be understood that the first guide surface 242 is located on the opposite side of the snap-fit ​​slot 241 in the length direction of the needle cover 2.

[0046] like Figure 4 and Figure 5 As shown, the second snap-fit ​​member 12 is inclined on the side wall opposite to the snap-fit ​​head 121 to form a second guide surface 122 for guiding the snap-fit ​​head 121 into the snap-fit ​​slot 241.

[0047] Guided by the first guide surface 242 and the second guide surface 122, when the needle cover 2 flips from the open state to the closed state, the inclined first guide surface 242 and the second guide surface 122 will first contact each other to guide the needle cover 2 to continue flipping. Finally, the clip head 121 will pass over the first clip 24 and be clipped into the clip slot 241 to achieve the clipping.

[0048] It is worth noting that in some other alternative embodiments, only one of the first guide surface 242 and the second guide surface 122 may be provided, which can also play a guiding role.

[0049] In order to position the needle body M2 when the needle cover 2 is closed, and to prevent the needle body M2 from swinging when bumped or shaken, in this embodiment, the needle cover 2 is provided with a second positioning structure for positioning the needle body M2.

[0050] This embodiment provides a specific second positioning structure, such as Figure 2 As shown, it mainly includes a protrusion 221 and an elastic arm 211. In some embodiments, both the protrusion 221 and the elastic arm 211 are integrally formed with the needle cover 2.

[0051] The protrusion 221 can be one or more, and they are arranged sequentially on the inner wall of the top plate 22 along the length of the needle cover 2, and the protrusion height of each protrusion 221 is the same.

[0052] The elastic arm 211 refers to a component with a certain elasticity. One end of the arm is fixed to one of the side plates 21, and the other end extends naturally as a clamping end. The clamping end is an inclined planar structure used to abut against the needle body M2.

[0053] Furthermore, in this embodiment, the elastic arm 211 is inclined, and its inclination direction is as follows: Figure 2 As shown, in the direction from the opening side of the needle cover 2 to the top plate portion 22, i.e. Figure 2 In the top-to-bottom direction, the elastic arm 211 gradually moves away from the side plate portion 21 to which it is fixed.

[0054] The inclined elastic arm 211 allows the needle cover 2 to rotate from the open state to the closed state. As the needle cover 2 rotates, the needle body M2 will first contact the outer wall of the elastic arm 211. As the needle cover 2 continues to rotate, the needle body M2 will exert a squeezing force on the inclined elastic arm 211, causing the elastic arm 211 to overcome its own elasticity and rotate towards the side plate 21 to which it is fixed, until the needle body M2 passes the end of the elastic arm 211. Then the elastic arm 211 returns to its original position under its own elasticity. After returning to its original position, the inner wall of the pressing end of the elastic arm 211 will abut against the needle body M2, thus pressing the needle body M2 against the protrusion 221. In other words, in the closed state, the needle body M2 is pressed between the elastic arm 211 and the protrusion 221 in the first direction L1, thus achieving the purpose of positioning the needle body M2 and keeping the needle body M2 stable and not easy to swing.

[0055] In addition, to ensure that the needle body M2 can pass through the elastic arm 211 normally, and that the needle body M2 is pressed between the elastic arm 211 and the protrusion 221, in the length direction of the needle cover, such as Figure 2 As shown, the protrusion 221 and the elastic arm 211 need to be staggered. For example, the elastic arm 211 is closer to the proximal end of the needle cover 2 than the protrusion 221.

[0056] Suppose that the protrusion 221 and the elastic arm 211 are in the same position, for example, the elastic arm 211 is directly above or below the protrusion 221. In this case, there is not enough space between the elastic arm 211 and the protrusion 221 for the needle body M2 to deform, so the needle body M2 cannot pass through the elastic arm 211 normally. However, by setting the two to be offset, the needle body M2 has a downward bending space on the lower side of the elastic arm 211 (or the opposite side of the elastic arm 211), so that the needle body M2 can pass through the elastic arm 211 normally.

[0057] In addition, in order to observe whether the needle body M2 is properly engaged, i.e., whether the needle body M2 is engaged between the elastic arm 211 and the protrusion 221, in some embodiments, such as... Figure 2 As shown, the top plate 22 has a through hole 222 that penetrates the top plate 22, and the elastic arm 211 is located at the position of the through hole 222.

[0058] At this time, the through hole 222 is equivalent to an observation port. The human eye can observe the state of the needle body M2 at the position of the elastic arm 211 through the through hole 222 to determine whether the needle body M2 is stuck in place.

[0059] Example 2 This embodiment is a further improvement on embodiment 1, specifically: In this embodiment, the needle cover 2 is defined such that, in the open state, the needle cover 2 can be flipped relative to the base 1 to the packaging position, such as... Figure 6 and Figure 8 The diagram shows the structure of the needle cover in the packaging position. In the packaging position, the needle cover 2 has a pre-tightening force relative to the base 1. Under the action of this pre-tightening force, the needle cover 2 has a tendency to flip towards the closed state. That is, in the packaging position, if no support force is provided for the needle cover 2, the needle cover 2 will flip towards the closed state under the action of the pre-tightening force.

[0060] In some embodiments, a specific structure is provided to generate the preload force, specifically, such as Figure 4 As shown, the base 1 includes a stop surface 111, preferably, the bottom surface of the groove of the connecting seat 11 forms the stop surface 111.

[0061] Correspondingly, such as Figure 3 and Figure 8 As shown, the connecting part 23 has an outwardly convex arcuate surface 233. In the packaged position, the arcuate surface 233 abuts against the stop surface 111 to provide the preload force.

[0062] In normal packaging, such as Figure 6 and Figure 8 As shown, the needle body M2 is equipped with a needle sleeve M3, which is fitted over the needle body M2 and fixed to the needle holder M1 and / or base 1. In the packaged state, the needle cover 2 will flip and abut against the needle sleeve M3 due to the aforementioned pre-tightening force. In other words, the needle sleeve M3 provides a supporting force for the needle cover 2, preventing the needle cover 2 from continuing to flip to the closed state. However, under the aforementioned pre-tightening force, the needle cover 2 still has a tendency to flip towards the closed state, thus preventing the needle cover 2 from accidentally opening during packaging and transportation.

[0063] In addition, in actual use, in order to allow the needle cover 2 to open to different angles depending on the puncture site or puncture angle, in some embodiments, the needle cover 2 can be flipped relative to the base 1 to a first position and a second position when in the open state.

[0064] In the first position, such as Figure 9 As shown, a first included angle A1 is formed between the needle cover 2 and the base 1, where 60° ≥ first included angle A1 ≥ 70°; In the second position, such as Figure 10 As shown, a second included angle A2 is formed between the needle cover 2 and the base 1, and 110° ≥ the second included angle A2 ≥ 120°.

[0065] The first and second included angles here can also be understood as the included angles between the length direction of the needle cover 2 and the axis of the needle body M2.

[0066] In some embodiments, the angle A1 of the first included angle is greater than the angle between the needle cover 2 and the base 1 at the packaging position. It can also be understood that during the process of the needle cover 2 flipping from the closed state to the open state, the needle cover 2 sequentially passes through the packaging position - the first position - the second position.

[0067] Furthermore, the needle cover 2 is defined as being able to remain in a first position and a second position when not subjected to external force.

[0068] Based on this, this embodiment provides a specific structure that allows the needle cover 2 to remain in the first and second positions when not subjected to external force. Specifically: like Figure 3 As shown, a first positioning surface 231 and a second positioning surface 232 are sequentially formed along the circumferential direction on the outer peripheral wall of the connecting part 23. A first protruding ridge 234 is formed between the first positioning surface 231 and the second positioning surface 232. Combined with the aforementioned arc-shaped surface 233, the order of the three surfaces is as follows: they are arranged sequentially along the circumferential direction of the connecting part 23. Specifically, as shown in the figure... Figure 8 Taking the shown viewpoint direction as an example, along the clockwise direction, the three surfaces 233, 231, and 232 are arranged in sequence, and a second convex ridge is formed between the first positioning surface 231 and the arc surface 233 (not shown in the figure due to the viewpoint).

[0069] Figures 8 to 10 This demonstrates the process of the needle cover flipping from its packaging position to a second position while in the open state: like Figure 8 As shown, the needle cover 2 is in the packaging position, at which time the arc surface 233 is basically in contact with the stop surface 111, generating the aforementioned pre-tightening force.

[0070] like Figure 9 As shown, when the needle cover 2 is rotated at an angle from the packaging position, the second protrusion passes over the stop surface 111, and the first positioning surface 231 abuts against the stop surface 111, forming a limit between them, so that the needle cover remains in the first position.

[0071] like Figure 10 As shown, when the needle cover 2 continues to rotate from the first position by an angle, the first protrusion 234 passes over the stop surface 111, and the second positioning surface 232 abuts against the stop surface 111, forming a limit between them. At this time, the needle cover is held in the second position.

[0072] Of course, in other alternative implementations, after the second position, a third position, a fourth position, etc., with successively increasing angles can be set, and the specific choice can be made according to actual needs. For example, in this embodiment, Figure 11 This shows the state where the needle cover 2 is in the third position.

[0073] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A needle protection mechanism for assembling onto a needle, the needle comprising a needle hub and a needle body disposed on the needle hub, characterized in that, The needle protection mechanism includes: Base for mounting the needle; A needle cover is rotatably connected to a base about a first axis so that the needle cover can switch between an open state and a closed state relative to the base. In the open state, the needle cover releases the needle body from the cover; in the closed state, the needle body is completely contained within the needle cover. A first positioning structure is provided between the base and the needle cover, and is used to position the needle cover so that the needle cover is kept in the closed state when the needle cover is in the closed state. The second positioning structure, located inside the needle cover, is used to position the needle body. It includes a protrusion and an elastic arm. The protrusion and the elastic arm are staggered along the length of the needle cover. In the closed state, under the elastic pressure of the elastic arm, the needle body is pressed against the protrusion in a first direction to maintain stability. The first direction is perpendicular to the length of the needle cover. The elastic arm is configured such that when the needle cover flips from the open state to the closed state, the elastic arm can deflect to one side under the squeezing of the needle body to avoid the needle body, so that the needle body passes over the elastic arm and is pressed against the protrusion.

2. The needle protection mechanism according to claim 1, characterized in that, The needle cover includes side plate portions located on opposite sides in a second direction, and the base is rotatably connected between the two side plate portions; the second direction is parallel to the first axis; The first positioning structure includes: The first snap-fit ​​component is provided on the inner side wall of the side plate portion. The side wall of the first snap-fit ​​component near the distal end of the needle cover has a snap-fit ​​groove recessed towards the proximal end of the needle cover. The second snap-fit ​​component is disposed on the base and has a snap-fit ​​head that can snap into a snap-fit ​​slot; when the needle cover is in the closed state, the snap-fit ​​head snaps into the snap-fit ​​slot to keep the needle cover in the closed state.

3. The needle protection mechanism according to claim 2, characterized in that, The slot is an arc-shaped slot structure, and the end face of the card head facing the slot is arc-shaped.

4. The needle protection mechanism according to claim 2, characterized in that, The side wall of the first snap-fit ​​member near the proximal end of the needle cover is inclined to form a first guide surface for guiding the snap-fit ​​head into the snap-fit ​​slot. And / or the side wall of the second card connector on the opposite side of the card head is inclined to form a second guide surface for guiding the card head into the card slot.

5. The needle protection mechanism according to claim 1, characterized in that, The needle cover includes a side plate portion located on opposite sides in a second direction and a top plate portion fixed between the two side plate portions. The needle cover is provided with an opening on the side opposite the top plate portion. The base is rotatably connected between the two side plate portions. The protrusion is fixed on the inner wall of the top plate portion. One end of the elastic arm is fixed to one of the side plate portions, and the elastic arm is inclined in the direction from the opening side of the needle cover to the top plate portion, with the elastic arm gradually moving away from the side plate portion to which it is fixed.

6. The needle protection mechanism according to claim 1, characterized in that, In the open state, the needle cover can be flipped relative to the base to the packaging position. In the packaging position, the needle cover has a pre-tightening force relative to the base. Under the action of this pre-tightening force, the needle cover tends to flip towards the closed state.

7. A needle protection mechanism according to claim 6, characterized in that, The base includes a stop surface, and the needle cover includes a connecting portion corresponding to the stop surface. The needle cover is rotatably connected to the base via the connecting portion. The connecting portion has an outwardly convex arc-shaped surface. In the packaging position, the arc-shaped surface abuts against the stop surface to provide the pre-tightening force.

8. The needle protection mechanism according to claim 1, characterized in that, In the open state, the needle cover can be rotated relative to the base to at least a first position and a second position. In the first position, a first angle is formed between the needle cover and the base, and in the second position, a second angle is formed between the needle cover and the base. Wherein, 60° ≥ the first angle ≥ 70°, 110° ≥ the second angle ≥ 120°, and the needle cover can be maintained in the first and second positions when not subjected to external force.

9. A needle protection mechanism according to claim 8, characterized in that, The base includes a stop surface, and the needle cover includes a connecting portion corresponding to the stop surface. The needle cover is rotatably connected to the base via the connecting portion. A first positioning surface and a second positioning surface are sequentially formed along the circumferential direction on the outer peripheral wall of the connecting portion, and a protruding ridge is formed between the first positioning surface and the second positioning surface. In the first position, the first positioning surface abuts against the stop surface to keep the needle cover in the first position, and in the second position, the second positioning surface abuts against the stop surface to keep the needle cover in the second position.

10. A needle protection mechanism according to claim 1, characterized in that, The needle cover has an opening side for the needle body to enter the needle cover; the needle cover includes a top plate portion located on the opposite side of the opening side, the top plate portion having a through hole penetrating the top plate portion, and the elastic arm located at the through hole position.

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