Injection device

Abstract

This application relates to an injection device. It includes: an injection plunger for performing injection motion during injection; a housing capable of pushing a directional ring to perform needle-piercing motion during injection; a directional ring for performing needle-piercing motion under the push of the housing; an unlocking sleeve with an unlocking structure for guiding the injection plunger to rotate around a first direction during injection; a first protrusion on the outer periphery of the injection plunger; the directional ring further drives the injection plunger to move relative to the unlocking sleeve and causes the first protrusion of the injection plunger to enter a guide groove to perform injection motion; an elastic element for pushing the injection plunger to perform injection motion through elastic force after the first protrusion enters the guide groove; an elastic element bracket for defining the position of the elastic element; a second protrusion on the side wall of the unlocking sleeve, and a third protrusion cooperating with the second protrusion on the elastic element bracket; the contact between the second and third protrusions is line contact.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to an injection device. Background Technology

[0002] An automatic injection pen is a syringe product designed for convenient use by patients or the general public. During production, manufacturers first fill the syringe with medication to create a pre-filled syringe (PFS, also known as a drug-loaded syringe). The PFS is then inserted into an automatic injection device to form the automatic injection pen, which is then transported and sold. After receiving the automatic injection pen, consumers use it as needed by removing the cap and pressing it onto the patient's injection site for trigger-activated injection. Compared to traditional syringes, it eliminates the need for drawing, inserting, and pushing medication with a disposable syringe, making operation more convenient and ensuring a consistent dosage, preventing errors due to operator inexperience.

[0003] However, existing automatic injection pens suffer from excessive triggering resistance and are prone to jamming during the triggering process. Summary of the Invention

[0004] In view of this, this application provides an injection device to solve at least one problem existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] This application provides an injection device, including:

[0007] An injection plunger is used to perform an injection motion in a first direction during injection to eject the injection solution;

[0008] The shell includes a proximal end and a relatively distal end;

[0009] A directional ring, located within the housing, is used to perform the needle insertion motion under the push of the housing;

[0010] An unlocking sleeve is fitted onto the directional ring and has an unlocking structure that guides the injection push rod to rotate around a first direction by a first preset angle during injection. The unlocking structure is an inclined surface or an arc surface. The outer periphery of the injection push rod has a first protrusion that cooperates with the unlocking structure and protrudes through the outer wall of the directional ring.

[0011] An elastic component is used to push the injection plunger to perform injection motion through elastic force;

[0012] An elastic element bracket is used to define the position of the elastic element; the elastic element bracket is linked with the directional ring in a first direction;

[0013] The unlocking sleeve has a first elastic arm on its side wall, a second protrusion on the first elastic arm, and a third protrusion on the elastic element bracket. Before operation, the movement of the elastic element bracket is restricted by the contact between the second and third protrusions in a first direction. At least one of the second or third protrusions has a slope or arc surface at the contacting part, so that the contact between the two is a line contact. During operation, the elastic element bracket squeezes the unlocking sleeve, and the first elastic arm is pushed outward by the component force generated by the slope or arc surface, causing the second and third protrusions to disengage and releasing the movement restriction of the elastic element bracket.

[0014] Optionally, the second protrusion has a first inclined surface at the part that contacts the third protrusion, and the third protrusion has a second inclined surface at the part that contacts the second protrusion, and the inclination angles of the first inclined surface and the second inclined surface are different.

[0015] Optionally, the second protrusion has a first plane that connects to the proximal end of the first inclined surface; the third protrusion has a second plane that connects to the distal end of the second inclined surface, and the first plane and the second plane are both parallel to the first direction when they are in contact with each other.

[0016] Optionally, the width of the first elastic arm at its narrowest point in the circumference is set to 2mm-4mm, and the thickness of the first elastic arm in the radial direction is 0.7mm-1.1mm.

[0017] Optionally, the side wall of the directional ring is provided with a first groove, and the first elastic arm is also provided with a fourth protrusion; after the injection is completed, after the elastic support retracts inward, the fourth protrusion abuts against the first groove of the directional ring in a first direction to prevent the directional ring from moving during needle insertion.

[0018] Optionally, the surface of the fourth protrusion that abuts against the first slot is inclined to form a barb structure.

[0019] Optionally, the inclination angle of the surface of the fourth protrusion abutting the first slot is 10°-30°.

[0020] Optionally, the outer side of the elastic element bracket is provided with a first latch that extends into the first slot. Through the cooperation of the first slot and the first latch, and the elastic force of the elastic element, a linkage in a first direction is established between the elastic element bracket and the directional ring.

[0021] Optionally, the injection push rod has a blind hole for accommodating the elastic element, and the opening of the blind hole is located at the distal end of the injection push rod; one end of the elastic element abuts against the bottom wall of the blind hole, and the other end passes through the opening of the blind hole and abuts against the distal end of the elastic element support, so that the injection push rod moves axially following the axial movement of the elastic element support.

[0022] Optionally, the elastic element bracket includes a top cover and a second elastic arm connected to both sides of the top cover and extending along a first direction, wherein the first latch is disposed on the second elastic arm; the other end of the elastic element abuts against the top cover.

[0023] The injection device provided in this application includes: an injection plunger for performing an injection motion during injection to push a piston inside a drug vial to eject the injection liquid; the injection motion is a linear movement along a first direction; a housing including a proximal end and a distal end; the housing can push a directional ring to perform a needle-piercing motion during injection, the needle-piercing motion being the movement of pushing the injection needle of the drug vial into the target organism; a directional ring located inside the housing for performing a needle-piercing motion under the push of the housing; the directional ring is sleeved on the injection plunger and has a guide groove for guiding the injection plunger to perform the injection motion; an unlocking sleeve sleeved on the directional ring and has an unlocking structure for guiding the injection plunger to rotate around the first direction by a first preset angle during injection, the unlocking structure being a slope or an arc surface; the outer periphery of the injection plunger has a first protrusion that cooperates with the unlocking structure and protrudes through the outer wall of the directional ring; the directional ring is also used to drive the injection plunger to move relative to the unlocking sleeve and trigger the injection plunger to rotate around the first direction, thereby causing the first... A protrusion enters a guide groove; an elastic component, used to push the injection plunger through elastic force after the first protrusion enters the guide groove; an elastic support, used to limit the position of the elastic component; during the needle insertion and injection movements, the elastic support and the directional ring are linked in the first direction; the side wall of the unlocking sleeve is provided with a first elastic arm, the first elastic arm is provided with a second protrusion, and the elastic support is provided with a third protrusion that cooperates with the second protrusion; before the injection device operates, the movement of the elastic support in the first direction is restricted by the axial contact of the second and third protrusions; at least one of the second or third protrusions is provided with a slope or arc surface at the part where they abut, so that the contact between the two is a line contact; when the injection device operates, the unlocking sleeve and the elastic support generate relative movement in the first direction, and the first elastic arm is pushed outward by the component force generated by the slope or arc surface, causing the second and third protrusions to disengage and releasing the movement restriction of the elastic support in the first direction. As can be seen, the injection device of this application embodiment has mutually cooperating inclined or arc-shaped surfaces on the second protrusion of the unlocking sleeve and the third protrusion of the elastic element bracket, so that the contact between the two is line contact, which reduces the sliding resistance of the elastic element bracket relative to the unlocking sleeve, making the user's operation less strenuous. Therefore, the injection device of this application embodiment can make the user's operation less strenuous.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1This is a schematic diagram of the external shape of the injection device provided in the embodiments of this application;

[0027] Figure 2 An exploded view (dissolved diagram) of the injection device provided in the embodiments of this application;

[0028] Figure 3 A schematic diagram of the orientation ring in the injection device provided in the embodiments of this application;

[0029] Figure 4 A schematic diagram of the injection plunger in the injection device provided in the embodiments of this application;

[0030] Figure 5 A schematic diagram of the unlocking sleeve in the injection device provided in the embodiments of this application. Figure 1 ;

[0031] Figure 6 A schematic diagram showing the injection push rod, elastic component, and elastic component support assembled together in the injection device provided in the embodiments of this application;

[0032] Figure 7 for Figure 6 A cross-sectional view;

[0033] Figure 8 A cross-sectional schematic diagram of the injection device provided in the embodiment of this application when it is not in operation;

[0034] Figure 9 for Figure 8 A magnified view of a portion of point A in the middle;

[0035] Figure 10 A cross-sectional schematic diagram of the injection device provided in the embodiments of this application during operation;

[0036] Figure 11 for Figure 10 A magnified view of a portion of point B in the middle;

[0037] Figure 12 A schematic diagram of the unlocking sleeve in the injection device provided in the embodiments of this application. Figure 2 ;

[0038] Figure 13 A cross-sectional schematic diagram of the injection device provided in the embodiment of this application after injection is completed;

[0039] Figure 14 for Figure 13 A magnified view of a portion of point C.

[0040] Explanation of reference numerals in the attached figures:

[0041] 10. Injection plunger; 11. First protrusion; 12. Elastic component; 13. Blind hole; 20. Liquid bottle; 21. Bottle body; 22. Piston; 23. Injection needle; 30. Shell; 31. Tube body; 32. Tube cap; 33. Fixing bushing; 40. Orientation ring; 41. Guide groove; 42. First slot; 50. Unlocking sleeve; 52. First elastic arm; 521. Second protrusion; 5211. First inclined surface; 5212. First plane; 522. Fourth protrusion; 60. Elastic component bracket; 61. Top cover; 62. Limiting post; 63. Third protrusion; 631. Second inclined surface; 632. Second plane; 64. Second elastic arm; 70. Needle stop. Detailed Implementation

[0042] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. For the sake of brevity, some prior art involved in the embodiments of this application, but not closely related to the innovation of this application, may not be described in the embodiments of this application. Readers can refer to relevant prior art, such as the invention patent with publication number CN116942962B.

[0043] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as those in the technical field to which this application pertains.

[0044] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0045] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0048] To fully understand this application, detailed steps and structures of preferred embodiments will be presented in the following description to illustrate the technical solution of this application. However, in addition to the preferred embodiments, this application may have other implementation methods.

[0049] The applicant of this application discovered during the research and development that in the prior art injection device, the contact area between the protrusion of the elastic arm of the unlocking sleeve and the protrusion of the elastic support is large, such as surface contact, which causes the user to encounter greater resistance when pushing the injection and is prone to jamming.

[0050] Therefore, based on further research and development by the applicant, the following technical solution was proposed.

[0051] To address the technical problems in related technologies, embodiments of this application provide an injection device. (See reference...) Figure 1 and Figure 2 The injection device includes:

[0052] The injection plunger 10 is used to perform an injection motion in a first direction during injection to push the injection liquid out of the medicine bottle;

[0053] Understandably, the injection solution is contained in a medicine bottle 20, which can be a vial containing a fluid medicine solution. The medicine bottle 20 may include a bottle body 21, a piston 22, and an injection needle 23. The injection push rod 10 is used to move the piston.

[0054] Understandably, the movement of piston 22 refers to its movement within the medicine bottle 20. The movement of piston 22 can compress the injection solution within the medicine bottle 20 to flow out towards the outlet, for example, from the injection needle 23.

[0055] The first direction can be the axial direction of the medicine bottle 20. Since the injection plunger 10, housing 30, etc. are all set corresponding to the medicine bottle 20, the first direction can also be the axial direction of the injection plunger 10 and housing 30 and other components.

[0056] The housing 30 includes a proximal end and a relatively distal end; the housing 30 can push the directional ring 40 to perform a needle-piercing movement during injection, the needle-piercing movement being the movement that pushes the injection needle 23 of the drug bottle 20 to pierce the target organism;

[0057] Understandably, the proximal end is the end closest to the target organism during injection, while the distal end is the opposite end. Similarly, other components can also be divided into proximal and distal ends based on the direction of injection.

[0058] Specifically, the housing 30 has a first accommodating cavity to accommodate components such as the injection push rod 10, the directional ring 40, the unlocking sleeve 50, and the elastic part 12.

[0059] Specifically, the needle insertion movement moves along the first direction.

[0060] Specifically, refer to Figure 2 The housing 30 includes a tube 31 and a fixed bushing 33 connected to the distal end of the tube 31; the fixed bushing 33 abuts against the directional ring 40 in a first direction, and during injection, the fixed bushing 33 pushes the directional ring 40 to move in the first direction.

[0061] Manufacturing the shell 30 into a tube 31 and a fixed bushing 33 separately and then assembling them helps reduce manufacturing costs. For example, the structure is simpler after separation, which simplifies processing.

[0062] Understandably, the retaining bushing 33 is used to close the distal end of the tube body 31, and the retaining bushing 33 abuts against the directional ring 40 in the first direction. During needle insertion and injection, the directional ring 40 can be moved in the first direction by the movement of the housing 30 in the first direction.

[0063] Specifically, the injection device further includes a cap 32; the cap 32 is fitted onto the proximal end of the housing 30 to seal the proximal end of the housing 30.

[0064] In this way, in addition to the needle guard 70 surrounding the injection needle 23 of the medicine bottle 20 from all sides, the injection needle 23 is also protected by the tube cap 32, making it safer to use.

[0065] A directional ring 40, located inside the housing 30, is used to perform the needle insertion movement under the push of the housing 30;

[0066] The directional ring 40 is sleeved on the injection push rod 10 and is provided with a guide groove 41 to guide the injection push rod 10 to perform the injection movement. (See reference) Figure 3 ;

[0067] Specifically, the distal end of the directional ring 40 axially abuts against the housing 30. During injection, the housing 30 moves toward the target organism along a first direction, causing the directional ring 40 to move in the first direction.

[0068] Specifically, before the injection push rod 10 enters the injection motion, the movement of the directional ring 40 in the first direction can drive the injection push rod 10 to move in the first direction, that is, to move relative to the unlocking sleeve 50.

[0069] After the injection plunger 10 enters the injection motion, it can perform injection motion along the direction of the guide groove 41. The guide groove 41 makes the movement direction of the injection plunger 10 more stable. Specifically, the guide groove 41 extends along the first direction.

[0070] An unlocking sleeve 50 is fitted onto the directional ring 40 and has an unlocking structure that guides the injection push rod 10 to rotate around a first direction by a first preset angle during injection. The unlocking structure is an inclined surface or an arc surface. (Refer to...) Figure 5 The injection plunger 10 has a first protrusion 11 on its outer periphery that mates with the unlocking structure and protrudes through the outer wall of the directional ring 40, for reference. Figure 4 ;

[0071] The directional ring 40 is also used to drive the injection push rod 10 to move relative to the unlocking sleeve 50, and to trigger the injection push rod 10 to rotate around the first direction, thereby causing the first protrusion 11 to enter the guide groove 41;

[0072] In detail, the unlocking structure is an inclined surface or an arc surface. When the injection push rod 10 moves relative to the unlocking sleeve 50, the first protrusion 11 abuts against the inclined surface or arc surface and moves along the extension direction of the inclined surface or arc surface, causing the injection push rod 10 to rotate around the first direction by a first preset angle.

[0073] In this embodiment, the unlocking structure is an inclined plane.

[0074] The elastic component 12 pushes the injection push rod to inject through elastic force; that is, after the first protrusion 11 enters the guide groove 41, it pushes the injection push rod 10 to inject through elastic force.

[0075] Understandably, the injection movement of the injection plunger 10 is formed by the elastic force of the elastic component 12. This not only simplifies the user's operation but also ensures a smoother injection process, preventing interference from improper force applied by the user.

[0076] Specifically, one end of the elastic component 12 abuts against the injection pusher 10. Before injection, the elastic component 12 is in a compressed state, but cannot apply elastic force because the axial position of the injection pusher 10 is restricted. After the injection pusher 10 rotates a first preset angle, the first protrusion 11 of the injection pusher 10 enters the guide groove 41, the axial position restriction is released, and under the elastic force of the elastic component 12, the injection pusher 10 moves along the direction of the guide groove 41 to perform the injection motion. Figure 6 and Figure 7 .

[0077] More specifically, the elastic component 12 can be a compression spring. Compression springs allow for more precise control of elastic force through parameters such as wire diameter and pitch, and are also low in cost.

[0078] The elastic element support 60 is used to define the position of the elastic element 12; the elastic element support 60 and the directional ring 40 are linked in a first direction; that is, in the needle insertion movement and the injection movement, the elastic element support 60 and the directional ring 40 are linked in a first direction.

[0079] Specifically, the proximal end of the elastic component 12 abuts against the injection push rod 10, and the distal end abuts against the elastic element support 60. Before injection, the elastic component 12 is compressed between the injection push rod 10 and the elastic element support 60. After the axial position restriction of the injection push rod 10 is released, the elastic force of the elastic component 12 drives the injection push rod 10 to move.

[0080] More specifically, see reference Figure 6 and Figure 7 The elastic element bracket 60 includes a top cover 61 and a limiting post 62 connected to the bottom wall of the top cover 61. The elastic element 12 is sleeved on the limiting post 62. The other end of the elastic element 12 abuts against the top cover 61.

[0081] The unlocking sleeve 50 has a first elastic arm 52 on its side wall, and a second protrusion 521 on the first elastic arm 52. The elastic element bracket 60 has a third protrusion 63 that cooperates with the second protrusion 521. Before operation, the movement of the elastic element bracket 60 in the first direction is restricted by the axial contact between the second protrusion 521 and the third protrusion 63. At least one of the second protrusion 521 or the third protrusion 63 has a bevel or arc surface at the contacting part, so that the contact between the two is a line contact. Figure 8 and Figure 9 During operation, the elastic element bracket 60 presses against the unlocking sleeve 50, and the first elastic arm 52 is pushed outward by the component force generated by the inclined surface or the arc surface, causing the second protrusion 521 and the third protrusion 63 to disengage, thereby releasing the movement restriction of the elastic element bracket 60. (Refer to...) Figure 10 and Figure 11 .

[0082] The engagement of the third protrusion 63 and the second protrusion 521 can be such that they abut against each other in a first direction, thus restricting the relative movement of the elastic support 60 and the unlocking sleeve 50 in the first direction. In actual injection, the unlocking sleeve 50 remains stationary relative to the target organism; therefore, the engagement of the third protrusion 63 and the second protrusion 521 can be considered as restricting the movement of the elastic support 60 in the first direction.

[0083] Specifically, the first elastic arm 52 is a cantilever structure, with one end fixed to the side wall of the unlocking sleeve 50 and the other end suspended in the air. Thus, the first elastic arm 52 has the elasticity to swing outwards or inwards with the end fixed to the side wall of the unlocking sleeve 50 as a reference. When the injection device is operating, the elastic support 60, driven by the directional ring 40, moves towards the target organism along the first direction. This causes the third protrusion 63 to press against the second protrusion 521, pushing the first elastic arm 52 to swing outwards and open.

[0084] Understandably, the process of the third protrusion 63 pressing against the second protrusion 521 involves a sliding process between them. In existing injection devices, the contact area between the third protrusion 63 and the second protrusion 521 in the first direction is relatively large, resulting in greater resistance to sliding, making user operation more laborious and prone to jamming. This embodiment addresses this by providing mutually cooperating inclined or curved surfaces at the contact point, ensuring a line contact between the two, significantly reducing sliding resistance and improving the user's operating experience.

[0085] Understandably, before the injection device is in operation, the purpose of restricting the movement of the elastic support 60 in the first direction by the axial abutment of the second protrusion 521 and the third protrusion 63 is to prevent the injection needle 23 of the liquid bottle 20 from protruding from the housing 30 when not in use, thus avoiding accidental injury to the user.

[0086] To help readers better understand the injection device of this application embodiment, the working process and operating principle of the injection device of this application embodiment will be briefly described below, based on the preliminary structural description above. The working process of the injection device mainly includes two stages: needle insertion and injection, which will be described below in this order:

[0087] 1) Injection. The user holds the housing 30 and places the needle sheath 70 against the injection site on the target organism. Then, force is applied to move the housing 30 towards the target organism. Because the needle sheath 70 remains stationary relative to the target organism while the medication bottle 20 moves with the housing 30, the injection needle 23 of the medication bottle 20 can protrude from the needle sheath 70 and pierce the target organism. After the injection needle 23 has penetrated to a certain depth, the injection process is complete.

[0088] 2) Injection. During the injection process, the movement of the housing 30 also causes the directional ring 40 and the injection push rod 10 to move in the same direction, while the unlocking sleeve 50, like the needle retainer 70, remains stationary relative to the target organism. Therefore, the injection push rod 10 moves relative to the unlocking sleeve 50. After the injection process is completed, the injection push rod 10, guided by the unlocking sleeve 50, rotates around the first direction by a first preset angle. This causes the first protrusion 11 of the injection push rod 10 to enter the guide groove 41 of the directional ring 40. Then, under the elastic force of the elastic part 12, the injection push rod 10 moves along the direction of the guide groove 41, pushing the piston 22 inside the medicine bottle 20 to move, squeezing out the injection liquid for injection. When the injection push rod 10 moves to a preset position, for example, when the piston 22 abuts against the bottom of the medicine bottle 20, the injection push rod 10 is blocked and cannot move further, thus completing the injection process.

[0089] The injection device of this application embodiment has mutually cooperating inclined or arc surfaces on the second protrusion 521 of the unlocking sleeve 50 and the third protrusion 63 of the elastic element bracket 60, so that the contact between the two is line contact, which reduces the sliding resistance of the elastic element bracket 60 relative to the unlocking sleeve 50, making the operation of the user less strenuous. (Refer to...) Figure 8 and Figure 9 Therefore, the injection device of this application embodiment makes the user's operation less strenuous.

[0090] In some other embodiments of this application, the second protrusion 521 has a first inclined surface 5211 at the part that contacts the third protrusion 63, and the third protrusion 63 has a second inclined surface 631 at the part that contacts the second protrusion 521, and the inclination angles of the first inclined surface 5211 and the second inclined surface 631 are different.

[0091] By varying the angle of inclination, the third protrusion 63 and the second protrusion 521 achieve line contact at the contact point. Compared to curved surfaces, inclined surfaces have lower processing costs.

[0092] Furthermore, the angle between the first inclined surface 5211 and the first direction can be set to be smaller, which can also reduce the movement resistance of the elastic element bracket 60 relative to the unlocking sleeve 50. The angle between the first inclined surface 5211 and the first direction is referenced. Figure 9 The included angle is marked as A1.

[0093] In some other embodiments of this application, the second protrusion 521 is provided with a first plane 5212 that is connected to the proximal end of the first inclined surface 5211; the third protrusion 63 is provided with a second plane 632 that is connected to the distal end of the second inclined surface 631, the first plane 5212 and the second plane 632 are parallel to each other and are both parallel to the first direction.

[0094] In this way, after the elastic element bracket 60 moves relative to the unlocking sleeve 50 and disengages from each other, the two can separate more smoothly without being affected by sharp edges or other factors that could cause jamming.

[0095] In other embodiments of this application, the width of the first elastic arm 52 at its narrowest circumferential point is set to 2mm-4mm, for example, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., see reference. Figure 12 The width at the narrowest point is Figure 12 The first elastic arm 52 has a radial thickness of 0.7mm-1.1mm, for example, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, etc. Figure 5 The Chinese label is T1.

[0096] This ensures that the first elastic arm 52 has sufficient strength and elasticity, meaning that even when the third protrusion 63 compresses the second protrusion 521, the first elastic arm 52 will swing outwards and open. Understandably, this swinging motion is based on elastic deformation.

[0097] In other embodiments of this application, the sidewall of the directional ring 40 is provided with a first groove 42, and the first elastic arm 52 is also provided with a fourth protrusion 522; after injection, when the elastic support 60 retracts inward, the fourth protrusion 522 abuts against the first groove 42 of the directional ring 40 in a first direction to prevent the needle movement of the directional ring 40, see reference. Figure 13 and Figure 14 .

[0098] It should be noted that during injection, the injection push rod 10 moves along the guide groove 41 in the first direction. After the injection is completed, the injection push rod 10 moves away from the area surrounded by the elastic element support 60, causing the second elastic arm 64 of the elastic element support 60 (see the description below) to lose its middle support and retract inward. The directional ring 40 falls naturally, and the first slot 42 abuts against the fourth protrusion 522 in the first direction, preventing the directional ring 40 from moving further and avoiding the injection needle 23 of the discarded injection pen from protruding from the housing 30 and injuring people after the injection is completed.

[0099] In some other embodiments of this application, the surface of the fourth protrusion 522 that abuts against the first slot 42 is inclined to form a barb structure.

[0100] The barbed structure makes the first slot 42 and the fourth protrusion 522 more firmly abut in the first direction, making them less likely to come loose.

[0101] In some other embodiments of this application, the inclination angle of the surface of the fourth protrusion 522 abutting against the first slot 42 is 10°-30°.

[0102] In this way, the first slot 42 and the fourth protrusion 522 are firmly connected, not easy to loosen, and also have high strength.

[0103] In some other embodiments of this application, the outer side of the elastic element bracket 60 is provided with a first latch that extends into the first latch 42. Through the cooperation of the first latch 42 and the first latch, and the elastic force of the elastic element, a linkage in a first direction is established between the elastic element bracket 60 and the directional ring 40.

[0104] Thus, during the needle insertion, pressing the distal end of the housing 30 pushes the directional ring 40 to move, which in turn pushes the elastic element support 60 to move.

[0105] In some other embodiments of this application, the injection push rod 10 has a blind hole 13 for accommodating the elastic element, and the opening of the blind hole 13 is located at the distal end of the injection push rod 10; one end of the elastic element 12 abuts against the bottom wall of the blind hole 13, and the other end passes through the opening of the blind hole 13 and abuts against the distal end of the elastic element support 60, so that the injection push rod 10 moves axially following the axial movement of the elastic element support 60.

[0106] That is, the elastic component 12 is in a compressed state by abutting the bottom wall of the blind hole 13 and the far end of the elastic component support 60 at both ends, and thus generates elastic potential energy through compression.

[0107] Specifically, for ease of processing, a small hole can be provided at the bottom of the blind hole, the diameter of which is smaller than the diameter of the elastic part 12.

[0108] In some other embodiments of this application, the elastic element bracket 60 includes a top cover 61 and a second elastic arm 64 connected to both sides of the top cover 61 and extending along a first direction, wherein the first latch is disposed on the second elastic arm 64; the other end of the elastic element 12 abuts against the top cover 61.

[0109] In this way, the elastic element bracket 60 can both resist the elastic element 12 in the first direction and establish a linkage relationship with the directional ring 40 in the first direction through the set first latch. One part realizes two functions, and the structure is more compact.

[0110] Specifically, the first latch can be part of the third protrusion 63. This eliminates the need for a separate first latch structure, resulting in a more compact structure.

[0111] Specifically, the second elastic arm 64 surrounds the injection push rod 10 and is laterally supported by the injection push rod 10. The second elastic arm 64 cannot retract inward before the injection push rod 10 moves out of the range of the second elastic arm 64 due to injection.

[0112] In some other embodiments of this application, the injection device further includes a needle guard 70, which is used to surround the injection needle 23 of the drug bottle 20 in a circumferential direction and to abut against the injection site of the target organism during injection.

[0113] The needle sleeve 70 serves as a support for the user's force application. After the needle sleeve 70 is pressed against the injection site of the target organism, the user can use it as a support to apply force to the housing 30. The housing 30 moves towards the target organism, that is, moves relative to the needle sleeve 70, causing the injection needle 23 of the medicine bottle 20 to protrude from the needle sleeve 70 and pierce the target organism. Furthermore, because the needle sleeve 70 remains stationary, the lateral position of the injection needle 23 is also relatively stable, allowing for relatively accurate insertion into the injection site without deviation or misalignment.

[0114] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the technical solutions contained in this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. An injection device, characterized in that, include: An injection plunger is used to perform an injection motion in a first direction during injection to eject the injection solution; The housing includes a proximal end and an opposing distal end; the housing has a first accommodating cavity; A directional ring, located within the housing, is used to perform the needle insertion motion under the push of the housing; An unlocking sleeve is fitted onto the directional ring and has an unlocking structure that guides the injection push rod to rotate around a first direction by a first preset angle during injection. The unlocking structure is an inclined surface or an arc surface. The outer periphery of the injection push rod has a first protrusion that cooperates with the unlocking structure and protrudes through the outer wall of the directional ring. An elastic component is used to push the injection plunger to perform injection motion through elastic force; An elastic element bracket is used to define the position of the elastic element; the elastic element bracket is linked with the directional ring in a first direction; The unlocking sleeve has a first elastic arm on its side wall, a second protrusion on the first elastic arm, and a third protrusion on the elastic element bracket. Before operation, the movement of the elastic element bracket is restricted by the contact between the second and third protrusions in a first direction. At least one of the second or third protrusions has a slope or arc surface at the contact point, making the contact between the two a line contact. During operation, the elastic element bracket presses against the unlocking sleeve, and the first elastic arm is pushed outward by the component force generated by the slope or arc surface, causing the second and third protrusions to disengage and releasing the movement restriction of the elastic element bracket. The second protrusion has a first slope at the contact point with the third protrusion, and the third protrusion has a second slope at the contact point with the second protrusion, and the inclination angles of the first and second slopes are different. The second protrusion has a first plane that connects to the proximal end of the first inclined surface; the third protrusion has a second plane that connects to the distal end of the second inclined surface, and the first plane and the second plane are parallel to the first direction when they are in contact with each other.

2. The injection device according to claim 1, characterized in that, The width of the first elastic arm at its narrowest point in the circumference is set to 2mm-4mm, and the thickness of the first elastic arm in the radial direction is 0.7mm-1.1mm.

3. The injection device according to claim 1, characterized in that, The directional ring has a first groove on its side wall, and the first elastic arm also has a fourth protrusion. After the injection is completed, the elastic support retracts inward, and the fourth protrusion abuts against the first groove of the directional ring in the first direction to prevent the directional ring from moving.

4. The injection device according to claim 3, characterized in that, The surface of the fourth protrusion that abuts against the first slot is inclined to form a barb structure.

5. The injection device according to claim 4, characterized in that, The inclination angle of the surface of the fourth protrusion that abuts against the first slot is 10°-30°.

6. The injection device according to claim 3, characterized in that, The outer side of the elastic element bracket is provided with a first latch that extends into the first slot. Through the cooperation of the first slot and the first latch, and the elastic force of the elastic element, a linkage in the first direction is established between the elastic element bracket and the directional ring.

7. The injection device according to any one of claims 1-6, characterized in that, The injection push rod has a blind hole for accommodating the elastic element, and the opening of the blind hole is located at the distal end of the injection push rod; one end of the elastic element abuts against the bottom wall of the blind hole, and the other end passes through the opening of the blind hole and abuts against the distal end of the elastic element support, so that the injection push rod moves axially following the axial movement of the elastic element support.

8. The injection device according to claim 6, characterized in that, The elastic element bracket includes a top cover and a second elastic arm connected to both sides of the top cover and extending along a first direction, wherein the first latch is disposed on the second elastic arm; the other end of the elastic element abuts against the top cover.

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