Prime device for injection pen and injection pen

Abstract

The utility model belongs to the technical field of syringe, especially is concerned to the injection pen is with the exciting device and injection pen, wherein one kind of injection pen is with exciting device, include: clutch lever, its rotation setting is in the one end of pen body, inner limiting pipe is covered in the outer wall of clutch lever, and clutch lever is suitable for relative inner limiting pipe axial movement, coil spring support, its cover set is in the outer wall of inner limiting pipe, coil spring setting is between coil spring support and inner limiting pipe, wherein, clutch lever drives inner limiting pipe synchronous rotation to pressurize coil spring when rotating, when exciting, clutch lever is relative inner limiting pipe axial movement to exciting work station, and coil spring drives inner limiting pipe and clutch lever synchronous rotation. Through the cooperation of inner limiting pipe, coil spring support and clutch lever, in the exciting process of injection pen, coil spring will not be relative coil spring support axial displacement, avoided the axial deformation between the inner ring and the outer ring of coil spring, thereby improved the stability of injection pen exciting.

Description

Technical Field

[0001] This utility model belongs to the field of syringe technology, and particularly relates to an activation device for an injection pen and an injection pen. Background Technology

[0002] An injection pen is a common medical device, mainly used to inject small amounts of drugs, such as insulin, adrenaline, or growth hormone. In order to achieve automatic injection, a coiled spring is usually set in the injection pen to provide the driving force for activation.

[0003] In related technologies, the current spring-driven structure of injection pens has the following technical defects: The inner coil of the coil spring is directly bent and embedded in the axial slot of the clutch rod. During activation, the inner coil of the coil spring is pushed by the clutch rod, forming a stress concentration point at the bend, which causes activation jamming. At the same time, during activation, the inner coil of the coil spring is pushed downward by the clutch rod, causing axial deformation between the inner and outer coils of the coil spring, affecting the elastic working performance of the coil spring, thus causing the technical problem of activation failure.

[0004] Therefore, it is essential to develop an excitation device for injection pens.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Utility Model Content

[0006] This disclosure provides at least one excitation device for an injection pen.

[0007] In a first aspect, embodiments of this disclosure provide an activation device for an injection pen, comprising: The clutch lever's rotation is located at one end of the pen body; An inner limiting tube is sleeved on the outer wall of the clutch rod, and the clutch rod is adapted to move axially relative to the inner limiting tube; A coil spring bracket is sleeved on the outer wall of the inner limiting tube, and a coil spring is arranged between the coil spring bracket and the inner limiting tube; When the clutch lever rotates, it drives the inner limit tube to rotate synchronously to compress the coil spring; During activation, the clutch lever moves axially relative to the inner limit tube to the activation position, and the coil spring drives the inner limit tube and the clutch lever to rotate synchronously in opposite directions.

[0008] In one optional embodiment, a positioning groove is formed on the outer wall of the coil spring bracket, and the outer end of the coil spring is fixed in the positioning groove.

[0009] In one optional embodiment, a protrusion is provided on the outer wall of one end of the inner limiting tube, and the inner end of the coil spring is fixed to the protrusion.

[0010] In one optional embodiment, a positioning disc is provided at the end of the inner limiting tube near the clutch lever, the positioning disc being used to limit the axial displacement of the coil spring.

[0011] In one optional embodiment, the outer wall of the clutch lever is provided with two axially symmetrical sliding grooves; The inner wall of the inner limiting tube is symmetrically provided with sliders that are adapted to the sliding groove, and the sliders are embedded in the sliding groove.

[0012] In one optional embodiment, a through hole is formed at the center of the coil spring bracket; A protruding ring is provided at the other end of the inner limiting tube; Wherein, after the inner limiting tube passes through the through hole, the convex ring abuts against the bottom wall of the coil spring bracket.

[0013] In one optional embodiment, a button is provided at the end of the pen body, a positioning post is provided inside the button, and a boss is provided at the end of the positioning post in the circumferential direction. The clutch lever has a retaining ring on its inner ring, and the retaining ring is hooked to the boss.

[0014] In one optional embodiment, a rotary gear is provided at one end of the coil spring bracket near the clutch lever. The outer diameter of the rotary gear is the same as the outer diameter of the coil spring bracket, and the inner diameter of the rotary gear is smaller than the inner diameter of the coil spring bracket.

[0015] Secondly, embodiments of this disclosure provide an injection pen, including: an upper pen body, wherein the inner wall of the upper pen body is provided with a positioning groove, and the outer wall of the coil spring bracket is provided with a positioning strip that cooperates with the positioning groove.

[0016] The beneficial effect of this utility model is that it provides an excitation device for an injection pen. Through the cooperation of the inner limiting tube, the coil spring bracket and the clutch rod, during the excitation process of the injection pen, that is, during excitation, the clutch rod moves axially relative to the inner limiting tube. At this time, the coil spring will not move axially relative to the coil spring bracket, thus avoiding axial deformation between the inner and outer rings of the coil spring, thereby improving the stability of the injection pen excitation.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

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

[0020] Figure 1 A perspective view of the excitation device for an injection pen provided in an embodiment of this disclosure; Figure 2 A perspective view of the clutch lever and coil spring bracket in their unfolded state, provided in an embodiment of this disclosure; Figure 3 A perspective view of the coil spring bracket and inner limiting tube provided in the embodiments of this disclosure; Figure 4 This is a partial cross-sectional perspective view of the injection pen provided in an embodiment of this disclosure.

[0021] In the picture: 1. Pen body; 11. Button; 12. Positioning post; 2. Clutch lever; 20. Slide groove; 21. Retaining ring; 3. Inner limiting tube; 30. Protrusion; 31. Positioning plate; 32. Slider; 33. Protruding ring; 4. Spring bracket; 40. Positioning groove; 41. Through hole; 42. Rotary drum gear; 43. Spring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0024] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0025] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0026] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0027] Research has revealed the following technical defects in the current spring-driven structure of injection pens: The inner coil of the coil spring is directly bent and embedded in the axial slot of the clutch rod. During activation, the inner coil of the coil spring is pushed by the clutch rod, forming a stress concentration point at the bend, which causes activation jamming. At the same time, during activation, the inner coil of the coil spring is pushed downward by the clutch rod, causing axial deformation between the inner and outer coils of the coil spring, affecting the elastic working performance of the coil spring, thus causing the technical problem of activation failure.

[0028] Therefore, it is essential to develop an excitation device for injection pens.

[0029] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] like Figures 1 to 4 As shown, at least one embodiment provides an activation device for an injection pen, comprising: A clutch lever 2 is rotatably mounted at one end of the pen body 1; two symmetrically arranged sliding grooves 20 are formed on the outer wall of the clutch lever 2. An inner limiting tube 3 is sleeved on the outer wall of the clutch lever 2, and the clutch lever 2 is adapted to move axially relative to the inner limiting tube 3; the inner wall of the inner limiting tube 3 is symmetrically provided with sliders 32 that are adapted to the sliding grooves 20. The sliders 32 are embedded in the sliding grooves 20 to form a sliding connection. When the clutch lever 2 rotates circumferentially, it drives the inner limiting tube 3 to rotate synchronously through the sliders 32. At the same time, when the clutch lever 2 moves axially, the sliders 32 slide within the sliding grooves 20. A coil spring bracket 4 is sleeved on the outer wall of the inner limiting tube 3, and a coil spring 43 is disposed between the coil spring bracket 4 and the inner limiting tube 3; when the clutch lever 2 rotates, it drives the inner limiting tube 3 to rotate synchronously to compress the coil spring 43; during activation, the clutch lever 2 moves axially relative to the inner limiting tube 3 to the activation position, and the coil spring 43 drives the inner limiting tube 3 and the clutch lever 2 to rotate synchronously in opposite directions. When the user rotates the clutch lever 2, the dosage knob on the outside of the pen body 1 drives the clutch lever 2 to rotate; the engagement of the groove 20 and the slider 32 transmits torque, and the coil spring 43 is compressed to store energy; when activation is performed, the button 11 is pressed, the button 11 pushes the clutch lever 2 to move axially, the slider 32 slides in the groove 20 to the activation position, and the coil spring 43 releases energy to drive the inner limit tube 3 and the clutch lever 2 to rotate synchronously in opposite directions, pushing the injection needle to complete the injection. This design avoids axial displacement of the coil spring 43 and eliminates stress concentration.

[0033] Reference Appendix Figure 3To prevent axial displacement of the coil spring 43, a positioning groove 40 is provided on the outer wall of the coil spring bracket 4, and the outer end of the coil spring 43 is fixed in the positioning groove 40. This ensures a stable connection between the outer ring of the coil spring 43 and the coil spring bracket 44. A protrusion 30 is provided on the outer wall of one end of the inner limiting tube 3, and the inner end of the coil spring 43 is fixed to the protrusion 30, forming an inner ring anchor point. When the clutch lever 2 drives the inner limiting tube 3 to rotate circumferentially, the inner limiting tube 3 drives the inner end of the coil spring 43 to rotate, thus achieving pressurized energy storage. (Continue to refer to the appendix...) Figure 3 To limit the coil spring 43 and prevent it from detaching from the inner limiting tube 3 and the coil spring bracket 4, a positioning disc 31 is provided at the end of the inner limiting tube 3 near the clutch lever 2. The positioning disc 31 is used to limit the axial displacement of the coil spring 43. The coil spring bracket 4 is sleeved on the outer wall of the inner limiting tube 3, and the positioning disc 31 cooperates with the end of the coil spring bracket 4. When the clutch lever 2 moves axially, the coil spring 43 only undergoes radial torsion rather than axial deformation, thereby maintaining stable elastic properties. The fixing method of the protrusion 30 and the positioning groove 40 ensures that there is no relative sliding between the inner and outer rings of the coil spring 43 during pressurization and excitation, avoiding jamming.

[0034] Reference Appendix Figure 4 To improve the stability of the inner limiting tube 3 and the coil spring bracket 4, a through hole 41 is opened at the axis of the coil spring bracket 4; a convex ring 33 is provided at the other end of the inner limiting tube 3; during assembly, after the inner limiting tube 3 passes through the through hole 41, the convex ring 33 abuts against the bottom wall of the coil spring bracket 4 to form an axial limit; the above structure prevents the inner limiting tube 3 from coming off the coil spring bracket 4 when rotating or moving, ensuring that the coil spring bracket 4 and the inner limiting tube 3 maintain concentric rotation during the excitation process, reducing friction and energy loss.

[0035] Reference Appendix Figure 4 A button 11 is provided at the end of the pen body 1, and a positioning post 12 is provided inside the button 11; a boss is provided at the end of the positioning post 12 along the circumferential direction; a fixing ring 21 is provided on the inner ring of the clutch rod 2, and the fixing ring 21 is hooked to the boss.

[0036] Reference Appendix Figure 4 The coil spring bracket 4 is provided with a rotary gear 42 at one end near the clutch lever 2. The outer diameter of the rotary gear 42 is the same as the outer diameter of the coil spring bracket 4, and the inner diameter of the rotary gear 42 is smaller than the inner diameter of the coil spring bracket 4.

[0037] At least one embodiment provides an injection pen, including: an upper pen body, the inner wall of which is provided with a positioning groove, and the outer wall of the coil spring bracket 4 is provided with a positioning strip that cooperates with the positioning groove.

[0038] The working principle is as follows: The user drives the clutch lever 2 to rotate by rotating the dosage knob on the outside of the pen body 1. When the clutch lever 2 rotates, it drives the inner limit tube 3 to rotate synchronously through the slider 32 and the slide groove 20, and the coil spring 43 is pressurized to store energy.

[0039] During activation, pressing button 11 pushes clutch lever 2 to move axially, causing clutch lever 22 to move axially to the activation position. The coil spring 43 releases energy, driving the inner limit tube 3 and clutch lever 2 to rotate synchronously in opposite directions. The rotary gear 42 outputs power to complete the injection. Throughout the process, the positioning disc 31 and the convex ring 33 limit the axial displacement of the coil spring 43, eliminating the risk of deformation.

[0040] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0042] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An activation device for an injection pen, characterized in that, include: The clutch lever (2) is rotated at one end of the pen body (1); The inner limiting tube (3) is sleeved on the outer wall of the clutch rod (2), and the clutch rod (2) is adapted to move axially relative to the inner limiting tube (3); A coil spring bracket (4) is sleeved on the outer wall of the inner limiting tube (3), and a coil spring (43) is disposed between the coil spring bracket (4) and the inner limiting tube (3); When the clutch lever (2) rotates, it drives the inner limit tube (3) to rotate synchronously, so as to pressurize the coil spring (43). During activation, the clutch lever (2) moves axially relative to the inner limit tube (3) to the activation position, and the coil spring (43) drives the inner limit tube (3) and the clutch lever (2) to rotate synchronously in opposite directions.

2. The excitation device for an injection pen as described in claim 1, characterized in that, A positioning groove (40) is provided on the outer wall of the coil spring bracket (4), and the outer end of the coil spring (43) is fixed in the positioning groove (40).

3. The excitation device for an injection pen as described in claim 1, characterized in that, The inner limiting tube (3) has a protrusion (30) on its outer wall, and the inner end of the coil spring (43) is fixed to the protrusion (30).

4. The excitation device for an injection pen as described in claim 1, characterized in that, The inner limiting tube (3) is provided with a positioning plate (31) at the end near the clutch rod (2), and the positioning plate (31) is used to limit the axial displacement of the coil spring (43).

5. The excitation device for an injection pen as described in claim 1, characterized in that, The outer wall of the clutch rod (2) is provided with two axially symmetrical sliding grooves (20); The inner wall of the inner limiting tube (3) is symmetrically provided with sliders (32) that are adapted to the slide groove (20), and the sliders (32) are embedded in the slide groove (20).

6. The excitation device for an injection pen as described in claim 4, characterized in that, A through hole (41) is provided at the axis of the coil spring bracket (4); The other end of the inner limiting tube (3) is provided with a protruding ring (33); After the inner limiting tube (3) passes through the through hole (41), the convex ring (33) abuts against the bottom wall of the coil spring bracket (4).

7. The excitation device for an injection pen as described in claim 1, characterized in that, A button (11) is provided at the end of the pen body (1), and a positioning post (12) is provided inside the button (11). A boss is provided at the end of the positioning post along the circumferential direction. The clutch lever (2) has a fixing ring (21) on its inner ring, and the fixing ring is hooked to the boss.

8. The excitation device for an injection pen as described in claim 1, characterized in that, The coil spring bracket (4) is provided with a rotary gear (42) at one end near the clutch rod (2). The outer diameter of the rotary gear (42) is the same as the outer diameter of the coil spring bracket (4), and the inner diameter of the rotary gear (42) is smaller than the inner diameter of the coil spring bracket (4).

9. An injection pen, comprising the activation device for an injection pen as described in any one of claims 1-8, characterized in that, The injection pen includes an upper pen body, the inner wall of which is provided with a positioning groove, and the outer wall of the coil spring bracket (4) is provided with a positioning strip that cooperates with the positioning groove.

Images