Injection pen and transmission link and feedback link for injection pen

Abstract

The utility model belongs to the medical technology field, concretely relates to a kind of injection pen and transmission connecting rod and feedback connecting rod for injection pen, and the injection pen includes: pen barrel, drive mechanism is arranged in it;The drive mechanism includes: scale rotating cylinder, transmission connecting rod, button, spring, feedback connecting rod, rectangular screw rod and fixed sleeve;When dose is adjusted, the scale rotating cylinder is suitable for driving transmission connecting rod lifting by rotation, and the transmission connecting rod overcomes the resistance of spring and is disengaged with scale rotating cylinder;When pressing injection, the button is suitable for pressing and pressing against transmission connecting rod, so that transmission connecting rod and scale rotating cylinder are engaged into an organic whole to follow scale rotating cylinder synchronous rotation;The injection pen and transmission connecting rod and feedback connecting rod for injection pen set pen barrel and drive mechanism, so that the adjustment of injection dose and the control of injection flow are cooperated by each component in drive mechanism;Meanwhile, process hole is set up on transmission connecting rod and feedback connecting rod to improve the coaxiality of mounting hole thereon.

Description

Technical Field

[0001] This utility model belongs to the field of medical technology, specifically relating to injection pens, and more particularly to an injection pen and a transmission link and feedback link for the injection pen. Background Technology

[0002] An injection pen is a drug injection device that is widely used to treat chronic diseases such as diabetes and growth hormone deficiency.

[0003] In related technologies, the driving force of the injection pen uses a torsion spring for energy storage. That is, the torsion spring stores energy when the injection dosage is adjusted by rotation, and then releases the energy of the torsion spring during the injection stage. The torsion spring drives the push rod to inject the drug into the cartridge.

[0004] However, as the torsion spring releases energy, its force decreases, and its injection flow rate cannot be adjusted. When injecting some painful medications, the initial flow rate is too high, which can exacerbate the user's pain.

[0005] Therefore, how to solve the above problems is a problem that urgently needs to be solved by those skilled in the art.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one injection pen, a transmission link for the injection pen, and a feedback link.

[0008] In a first aspect, embodiments of this disclosure provide an injection pen, comprising: a pen barrel containing a driving mechanism; the driving mechanism comprising: a graduated cylinder disposed within the pen barrel and threadedly engaged with the pen barrel; a transmission link disposed within the graduated cylinder and meshing with the graduated cylinder via teeth; wherein, a first mounting hole is provided at the axis of the transmission link, and a pair of first process holes communicating with the first mounting hole are provided on the side wall of the transmission link; a button connected to the graduated cylinder; a spring, one end of which abuts against the button and the other end against the graduated cylinder; a feedback link inserted into the first mounting hole of the transmission link and rotating synchronously with the transmission link via axial limiting; during dosage adjustment, the graduated cylinder is adapted to drive the transmission link to rise and fall by rotation, while the transmission link overcomes the resistance of the spring and disengages from the graduated cylinder; during injection, the button is adapted to be pressed down against the transmission link, so that the transmission link and the graduated cylinder mesh together to rotate synchronously with the graduated cylinder.

[0009] In one optional embodiment, a fixing sleeve is provided inside the pen holder, and a ratchet is provided on the fixing sleeve; a pair of ratchet teeth are provided at the lower part of the feedback linkage.

[0010] In one optional embodiment, a through hole is provided at the center of the fixed sleeve, and two external threads are provided in the through hole; a rectangular lead screw is inserted into the feedback connecting rod, and the rectangular lead screw engages with the external threads in the through hole.

[0011] In one optional embodiment, the inner wall of the first mounting hole is provided with a limiting spline along the axial direction; the side wall of the feedback link is provided with a limiting groove along the axial direction.

[0012] In one optional embodiment, a second mounting hole for inserting a rectangular lead screw is provided at the axis of the feedback link; a pair of second process holes communicating with the second mounting hole are provided on the side wall of the feedback link.

[0013] In one alternative embodiment, the two first process holes are located on both sides of the transmission link; the two second process holes are located on both sides of the feedback link.

[0014] Secondly, this disclosure also provides a transmission link for an injection pen, wherein the transmission link has a first mounting hole along its axis; the side wall of the transmission link has a pair of first process holes communicating with the first mounting hole; wherein the two first process holes are located on both sides of the transmission link.

[0015] In one optional embodiment, the inner wall of the first mounting hole is provided with a limit spline along the axial direction; the upper part of the transmission connecting rod is provided with a first vertical tooth set.

[0016] Thirdly, this disclosure also provides a feedback link for an injection pen, wherein the feedback link has a second mounting hole along its axis; the side wall of the feedback link has a pair of second process holes communicating with the second mounting hole; wherein the two second process holes are located on both sides of the feedback link.

[0017] In one optional embodiment, the sidewall of the feedback link has a limiting groove along the axial direction; the lower part of the feedback link is provided with a pair of ratchet teeth; and the second mounting hole is a square hole.

[0018] The beneficial effects of this utility model are that, by setting up a pen cylinder and a drive mechanism, the scale cylinder, drive linkage, feedback linkage, button, spring, fixing sleeve and rectangular lead screw in the drive mechanism cooperate with each other to realize the rotation of the scale cylinder to adjust the injection dosage and the manual pressing of the button to control the injection flow rate; at the same time, process holes are opened on the drive linkage and feedback linkage to improve the coaxiality of the mounting holes on the drive linkage and feedback linkage.

[0019] 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.

[0020] 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

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art 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.

[0022] Figure 1 This is a schematic diagram of the structure of an injection pen provided in an embodiment of the present disclosure; Figure 2 This is a cross-sectional view of an injection pen provided in an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the internal structure of a pen holder provided in an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of a drive mechanism provided in an embodiment of the present disclosure; Figure 5 This is a top view of a fixing sleeve provided in an embodiment of the present disclosure; Figure 6 This is a schematic diagram of the structure of a transmission link provided in an embodiment of the present disclosure; Figure 7 This is a schematic diagram of a feedback linkage provided in an embodiment of the present disclosure; Figure 8 This is a schematic diagram of the structure of a graduated rotary drum provided in an embodiment of this disclosure.

[0023] In the picture: Pen holder 1; Drive mechanism 2, graduated rotary cylinder 21, second vertical gear group 211, transmission connecting rod 22, first mounting hole 221, first process hole 222, limit spline 223, first vertical gear group 224, feedback connecting rod 23, limit groove 231, second mounting hole 232, second process hole 233, ratchet 234, button 24, spring 25, fixing sleeve 26, ratchet 261, through hole 262, external thread 263, rectangular lead screw 27; Medicine storage 3, medicine bottle 31. Detailed Implementation

[0024] 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.

[0025] It should be noted that similar reference numerals 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. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0026] 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.

[0027] like Figure 1 , Figure 2 As shown, at least one embodiment provides an injection pen, including: a pen barrel 1 and a medicine container 3 connected to the pen barrel 1, wherein a drive mechanism 2 is provided inside the pen barrel 1, and the medicine container 3 is used to hold a medicine bottle 31.

[0028] Specifically, the drive mechanism 2 is used to adjust the injection dosage and squeeze the vial 31 to inject the drug.

[0029] like Figure 3 As shown, in some embodiments, the drive mechanism 2 includes: a scaled rotary drum 21, a transmission link 22, a feedback link 23, a button 24, a spring 25, a fixed sleeve 26, and a rectangular lead screw 27.

[0030] Specifically, in combination Figure 4 , Figure 5 The fixed sleeve 26 is fixedly installed inside the pen holder 1. A ratchet 261 is provided on it, and a through hole 262 is provided at the axis. Two external threads 263 are provided in the through hole 262.

[0031] Specifically, in combination Figure 4 The lower end of the feedback link 23 is provided with a pair of ratchet teeth 234, which cooperate with the ratchet wheel 261 to make the feedback link 23 rotate in one direction; wherein, the feedback link 23 is clamped by the fixing sleeve 26 and the pen holder 1 to be limited in the height direction, and a square second mounting hole 232 is provided at the axis of the feedback link 23.

[0032] Specifically, in combination Figure 5The rectangular lead screw 27 is inserted into the second mounting hole 232 of the feedback link 23 to rotate synchronously with the feedback link 23; wherein, the rectangular lead screw 27 is engaged with the external thread 263 in the through hole 262 so that the drug is injected by descending through the thread engagement when the feedback link 23 rotates.

[0033] Specifically, in combination Figure 6 The transmission link 22 has a first mounting hole 221 at its shaft center. The transmission link 22 is sleeved on the feedback link 23 through the first mounting hole 221, and the axial limit in the first mounting hole 221 drives the feedback link 23 to rotate synchronously. The transmission link 22 can be raised and lowered by force on the feedback link 23.

[0034] Specifically, in combination Figure 6 , Figure 8 The graduated cylinder 21 is sleeved around the transmission connecting rod 22, and the side wall of the graduated cylinder 21 is threadedly engaged with the inner wall of the pen holder 1. The graduated cylinder 21 is raised and lowered relative to the pen holder 1 by rotating the graduated cylinder 21. The transmission connecting rod 22 is engaged with the vertical teeth on the graduated cylinder 21 by vertical teeth to hang on the graduated cylinder 21, so that the graduated cylinder 21 drives the transmission connecting rod 22 to rise and fall synchronously when it rises and falls. During the raising and lowering of the transmission connecting rod 22, the vertical teeth disengage to prevent the transmission connecting rod 22 from rotating with it.

[0035] Specifically, button 24 is connected to scale cylinder 21 and located above transmission link 22.

[0036] Specifically, spring 25 is located between button 24 and transmission link 22. One end of spring 25 abuts against button 24, and the other end abuts against scale cylinder 21. The downward pressure of spring 25 on transmission link 22 is much less than the resistance of ratchet 234 and ratchet 261 when rotating. This allows transmission link 22 to disengage by squeezing spring 25 while scale cylinder 21 drives transmission link 22 to rise and fall. At the same time, the presence of spring 25 produces a clear impact sound when disengaging teeth, so that the operator can intuitively feel the rotation of scale cylinder 21.

[0037] In this embodiment, when the injection dosage needs to be adjusted, the operator rotates the graduated cylinder 21 to drive the transmission link 22. At this time, the transmission link 22 and the graduated cylinder 21 disengage and do not rotate together. When the dosage adjustment is completed and the drug needs to be injected, the operator presses the button 24, so that the button 24 abuts against the transmission link 22. At this time, the transmission link 22 and the graduated cylinder 21 mesh together. The transmission link 22 is forced to push the graduated cylinder 21 to rotate downward and rotates with the graduated cylinder 21, thereby driving the feedback link 23 and the rectangular lead screw 27 to rotate synchronously, so that the rectangular lead screw 27 descends and squeezes the medicine bottle 31 in the medicine chamber 3 to inject the drug.

[0038] The first mounting hole 221 of the transmission connecting rod 22 and the second process hole 233 of the feedback connecting rod 23 have very high requirements for coaxiality. However, both the transmission connecting rod 22 and the feedback connecting rod 23 are injection molded. During the injection molding process, a column with the same shape as the mounting hole is first set on the mold, so that the mounting hole is formed after injection molding. However, because the column is relatively long, it is easy to bend and tilt during the injection process due to the pressure of the material, which leads to poor coaxiality of the mounting hole after molding.

[0039] To solve the above problems, such as Figure 6 , Figure 7 As shown, in some embodiments, the side wall of the transmission link 22 is provided with a pair of first process holes 222 communicating with the first mounting hole 221; the side wall of the feedback link 23 is provided with a pair of second process holes 233 communicating with the second mounting hole 232.

[0040] In this embodiment, a support member can be provided at the process hole to hold the end of the column against it, thereby preventing the column from shaking under force during injection molding.

[0041] In some embodiments, two first process holes 222 are located on both sides of the transmission link 22; two second process holes 233 are located on both sides of the feedback link 23.

[0042] like Figure 6 , Figure 7 As shown, in some embodiments, the inner wall of the first mounting hole 221 is provided with a limiting spline 223 along the axial direction; the side wall of the feedback link 23 is provided with a limiting groove 231 along the axial direction.

[0043] In this embodiment, the cooperation between the limiting spline 223 and the limiting groove 231 enables the transmission link 22 to drive the feedback link 23 to rotate synchronously, as well as the function of lifting and lowering along the feedback link 23.

[0044] like Figure 6 , Figure 8 As shown, in some embodiments, the scale cylinder 21 is provided with a second set of vertical teeth 211, and the upper part of the transmission connecting rod 22 is provided with a first set of vertical teeth 224.

[0045] Specifically, the teeth in the second set of teeth 211 are evenly arranged in a ring.

[0046] Specifically, the number of teeth in the first set of teeth 224 is much smaller than that in the second set of teeth 211, thereby reducing the resistance to tooth removal. Optionally, the number of teeth in the first set of teeth 224 is four, and they are evenly distributed.

[0047] At least one embodiment also provides a transmission link for an injection pen, comprising: a first mounting hole 221 formed along the axis of the transmission link 22; a pair of first process holes 222 formed on the side wall of the transmission link 22 communicating with the first mounting hole 221; wherein the two first process holes 222 are located on both sides of the transmission link 22.

[0048] In some embodiments, the inner wall of the first mounting hole 221 is provided with a limit spline 223 along the axial direction; the upper part of the transmission connecting rod 22 is provided with a first vertical tooth set 224.

[0049] At least one embodiment also provides a feedback link for an injection pen, comprising: a second mounting hole 232 formed along the axis of the feedback link 23; and a pair of second process holes 233 formed on the side wall of the feedback link 23 communicating with the second mounting hole 232; wherein the two second process holes 233 are located on both sides of the feedback link 23.

[0050] In some embodiments, the sidewall of the feedback link 23 has a limiting groove 231 formed along the axial direction; a pair of ratchet teeth 234 are provided at the lower part of the feedback link 23; and the second mounting hole 232 is a square hole.

[0051] In summary, this injection pen and its transmission and feedback linkages, through the configuration of the pen holder 1 and the drive mechanism 2, enable the scale cylinder 21, transmission linkage 22, feedback linkage 23, button 24, spring 25, fixing sleeve 26, and rectangular lead screw 27 within the drive mechanism 2 to cooperate with each other, thereby achieving the adjustment of the injection dosage by rotating the scale cylinder 21 and the adjustment of the injection flow rate by manually pressing the button 24; at the same time, process holes are provided on the transmission linkage 22 and the feedback linkage 23 to improve the coaxiality of the mounting holes on the transmission linkage 22 and the feedback linkage 23.

[0052] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0053] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0060] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0061] 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 injection pen, characterized in that, include: Pen holder (1), which is equipped with a drive mechanism (2); The drive mechanism (2) includes: The graduated rotary cylinder (21) is set inside the pen holder (1) and is threadedly engaged with the pen holder (1); A transmission link (22) is disposed inside a graduated cylinder (21) and meshes with the graduated cylinder (21) through a vertical tooth; wherein, a first mounting hole (221) is provided at the axis of the transmission link (22), and a pair of first process holes (222) communicating with the first mounting hole (221) are provided on the side wall of the transmission link (22). Button (24) is connected to the graduated cylinder (21); A spring (25) has one end abutting against the button (24) and the other end abutting against the scale cylinder (21); The feedback link (23) is inserted into the first mounting hole (221) of the transmission link (22) and rotates synchronously with the transmission link (22) through axial limiting; During dosage adjustment, the scale drum (21) is adapted to drive the transmission link (22) to rise and fall by rotating, while the transmission link (22) overcomes the resistance of the spring (25) and disengages from the scale drum (21); When the injection is pressed, the button (24) is adapted to be pressed down against the transmission link (22) so that the transmission link (22) and the scale cylinder (21) are engaged together to rotate synchronously with the scale cylinder (21).

2. The injection pen as described in claim 1, characterized in that, A fixing sleeve (26) is provided inside the pen holder (1), and a ratchet (261) is provided on the fixing sleeve (26). The lower part of the feedback link (23) is provided with a pair of ratchet teeth (234).

3. The injection pen as described in claim 2, characterized in that, The fixed sleeve (26) has a through hole (262) at the center of the shaft, and two external threads (263) are provided in the through hole (262). A rectangular lead screw (27) is inserted into the feedback link (23), and the rectangular lead screw (27) is engaged with the external thread (263) in the through hole (262).

4. The injection pen as described in claim 3, characterized in that, The inner wall of the first mounting hole (221) is provided with a limit spline (223) along the axial direction. The side wall of the feedback link (23) is provided with a limiting groove (231) along the axial direction.

5. The injection pen as described in claim 1, characterized in that, The feedback link (23) has a second mounting hole (232) at its axis for inserting a rectangular lead screw (27); The side wall of the feedback link (23) is provided with a pair of second process holes (233) that communicate with the second mounting hole (232).

6. The injection pen as described in claim 5, characterized in that, The two first process holes (222) are located on both sides of the transmission connecting rod (22); The two second process holes (233) are located on both sides of the feedback link (23).

7. A transmission linkage for an injection pen, characterized in that, The transmission link (22) has a first mounting hole (221) along its axis; The transmission link (22) has a pair of first process holes (222) on its side wall that communicate with the first mounting hole (221). The two first process holes (222) are located on both sides of the transmission connecting rod (22).

8. The transmission linkage for an injection pen as described in claim 7, characterized in that, The inner wall of the first mounting hole (221) is provided with a limit spline (223) along the axial direction. The upper part of the transmission link (22) is provided with a first vertical tooth group (224).

9. A feedback linkage for an injection pen, characterized in that, The feedback link (23) has a second mounting hole (232) along its axis; The side wall of the feedback link (23) is provided with a pair of second process holes (233) that communicate with the second mounting hole (232). The two second process holes (233) are located on both sides of the feedback link (23).

10. The feedback linkage for an injection pen as described in claim 9, characterized in that, The side wall of the feedback link (23) is provided with a limiting groove (231) along the axial direction. The lower part of the feedback link (23) is provided with a pair of ratchet teeth (234). The second mounting hole (232) is a square hole.

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