Pen-injector

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, concretely relates to a pen type syringe, and the pen type syringe comprises: a pen body cylinder, a scale rotating cylinder is arranged in the pen body cylinder and can rotate relative to the pen body cylinder, the upper portion of the scale rotating cylinder is provided with an installation cavity, and the inner wall of the installation cavity is provided with at least two reverse buckles, a button is inserted in the installation cavity, and the outer wall of the button is provided with an annular limiting slot, wherein when the button is connected with the scale rotating cylinder, each reverse buckle is located in the annular limiting slot, the annular convex is arranged as an arc along the axial section of the pen type syringe, the linear contact is formed between the annular convex and the scale rotating cylinder, compared with surface contact, the resistance that the scale rotating cylinder receives when rotating relative to the button is lower, meanwhile, the scale rotating cylinder adopts the reverse buckle of multistage type, each reverse buckle extends into the annular limiting slot and clamps the button, compared with the reverse buckle of integral annular, the contact surface between the scale rotating cylinder and the button is less.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to syringes, and more particularly to a pen-type syringe. Background Technology

[0002] A pen injector is a pre-filled medication injection device that resembles a pen in shape. It is primarily used by patients who require frequent, long-term subcutaneous self-injections, greatly simplifying the injection process and improving the convenience, accuracy, and privacy of medication administration.

[0003] In related technologies, pen syringes adjust the injection dosage by rotating a graduated cylinder. During injection, the graduated cylinder is rotated back to its original position by pressing a button on the graduated cylinder to complete the injection.

[0004] However, in the above scheme, when the injection is pressed, the graduated cylinder rotates relative to the button because the button remains pressed and does not rotate. During this process, there is a large friction between the graduated cylinder and the button, which affects the injection operation.

[0005] Therefore, how to reduce the resistance of the graduated rotary cylinder during the injection process is a technical 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 this 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 pen-type syringe, comprising: a pen body; a graduated rotating cylinder, which is inserted into the pen body and rotatable relative to the pen body, wherein the upper part of the graduated rotating cylinder has an installation cavity, and the inner wall of the installation cavity is provided with at least two buckles; and a button, which is inserted into the installation cavity, wherein the outer wall of the button has an annular limiting groove; wherein when the button is connected to the graduated rotating cylinder, each of the buckles is located within the annular limiting groove.

[0008] In one alternative embodiment, an annular protrusion is formed below the annular limiting groove, and the annular protrusion has an arc-shaped cross-section along the axial direction of the pen syringe.

[0009] In one alternative embodiment, the cross-section of the inverted clip along the axial direction of the pen syringe is arc-shaped.

[0010] In one alternative embodiment, all the buckles are located in the same plane and are evenly distributed circumferentially.

[0011] In one alternative implementation, the number of the inverted buckles is two, three, or four.

[0012] In one optional embodiment, a transmission link is inserted into the graduated cylinder; a spring is provided in the mounting cavity; wherein one end of the spring abuts against the button and the other end abuts against the transmission link.

[0013] In one optional embodiment, the upper end of the transmission link has a limiting cylinder; wherein the upper end of the limiting cylinder is open and the lower end of the limiting cylinder is closed; the button has a pressing post inside; the pressing post is adapted to be inserted into the limiting cylinder and has a gap with the bottom of the limiting cylinder; and when the button is pressed, the pressing post is adapted to move downward to abut against the transmission link.

[0014] In one optional embodiment, the transmission connecting rod is provided with a downward-facing first vertical tooth set; the bottom surface of the mounting cavity is provided with a second vertical tooth set adapted to the first vertical tooth set.

[0015] In one alternative embodiment, the pen-type syringe further includes: a liner; the graduated cylinder passes through the liner and is threadedly engaged with the liner.

[0016] In one alternative embodiment, the inner wall of the liner is provided with external threads; the outer wall of the graduated cylinder is provided with internal threads adapted to the external threads.

[0017] The beneficial effects of this utility model are that, by setting the annular protrusion along the axial cross-section of the pen syringe to be arc-shaped, the annular protrusion and the graduated cylinder are in line contact. Compared with the surface contact in the prior art, the graduated cylinder in this embodiment experiences less resistance when rotating relative to the button. At the same time, the graduated cylinder adopts a multi-segmented inverted design, with each inverted clip extending into the annular limiting groove to engage the button. Compared with the overall annular inverted clip in the prior art, the graduated cylinder and the button have less contact surface in this embodiment, resulting in less resistance when they rotate relative to each other.

[0018] 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.

[0019] 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

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the structure of a pen-type syringe provided in an embodiment of the present disclosure; Figure 2 A cross-sectional view of a pen-type syringe provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of the structure of a graduated rotary drum provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of the structure of a button provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of a transmission link provided in an embodiment of the present disclosure.

[0022] In the picture: 1. Pen body; 11. Inner liner; 111. External thread; 2. Scaled rotary cylinder; 20. Mounting cavity; 201. Second vertical tooth group; 21. Undercut; 22. Internal thread; 3. Button; 31. Annular limiting groove; 32. Annular protrusion; 33. Downward pressure column; 4. Transmission connecting rod; 41. First vertical gear set; 42. Limiting sleeve; 5. Spring. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1 , Figure 2 As shown, at least one embodiment provides a pen-type injector, including: a pen body 1, a graduated rotary cylinder 2, and a button 3.

[0027] Specifically, such as Figure 2 As shown, the pen body 1 is the outermost layer of the pen syringe and serves as a protective shell. An inner liner 11 is provided inside it. The inner liner 11 is snapped into the pen body 1 and forms an integral part with the pen body 1. The inner wall of the inner liner 11 is provided with external threads 111.

[0028] Specifically, such as Figure 2 , Figure 3 As shown, the graduated cylinder 2 passes through the inner liner 11 and is threadedly connected to the inner liner 11; wherein, the outer wall of the graduated cylinder 2 is provided with an internal thread 22, and the graduated cylinder 2 is threadedly connected to the outer thread 111 of the inner liner 11 through the internal thread 22, that is, the graduated cylinder 2 adjusts the injection dosage by rotating and moving up and down relative to the inner liner 11; and, the upper part of the graduated cylinder 2 is provided with a mounting cavity 20 for mounting the button 3, and the inner wall of the mounting cavity 20 is provided with at least two buckles 21.

[0029] Specifically, such as Figure 2 ,like Figure 4 As shown, button 3 is inserted into the mounting cavity 20 and engaged with the scale cylinder 2; wherein, an annular limiting groove 31 is provided on the outer wall of button 3, and an annular protrusion 32 is formed below the annular limiting groove 31, and the annular protrusion 32 has an arc-shaped cross section along the axial direction of the pen syringe; and when button 3 is engaged with scale cylinder 2, each of the buckles 21 of scale cylinder 2 is located in the annular limiting groove 31.

[0030] In this embodiment, since the annular protrusion 32 has an arc-shaped cross-section along the axial direction of the pen syringe, the annular protrusion 32 and the graduated cylinder 2 are in line contact. Compared with the surface contact in the prior art, the graduated cylinder 2 in this embodiment experiences less resistance when rotating relative to the button 3. At the same time, the graduated cylinder 2 uses a multi-segmented inverted buckle 21 to extend into the annular limiting groove 31 to engage the button 3. Compared with the inverted buckle of the entire annular shape in the prior art, the graduated cylinder 2 and the button 3 have less contact surface in this embodiment, resulting in less resistance when they rotate relative to each other.

[0031] In some embodiments, the cross-section of the inverted buckle 21 along the axial direction of the pen syringe is arc-shaped.

[0032] like Figure 2 , Figure 3As shown, in some embodiments, each buckle 21 is located in the same plane and is evenly distributed circumferentially.

[0033] In this embodiment, the buckles 21 are evenly distributed circumferentially, making the scale cylinder 2 more stable when rotating; and the buckles 21 are located in the same plane, making the coaxiality between the scale cylinder 2 and the button 3 higher.

[0034] In some embodiments, the number of inverted buckles 21 is two, three, or four.

[0035] Optionally, in this embodiment, two inverted 21s are used.

[0036] like Figure 2 , Figure 5 As shown, in some embodiments, a transmission link 4 is inserted into the graduated cylinder 2; a spring 5 is provided in the mounting cavity 20; wherein one end of the spring 5 abuts against the button 3, and the other end abuts against the transmission link 4.

[0037] like Figure 2 , Figure 5 As shown, in some embodiments, the upper end of the transmission link 4 has a limiting cylinder 42; wherein the upper end of the limiting cylinder 42 is open and the lower end of the limiting cylinder 42 is closed; the button 3 has a pressing post 33 inside; the pressing post 33 is adapted to be inserted into the limiting cylinder 42 and has a gap with the bottom of the limiting cylinder 42; and when the button 3 is pressed, the pressing post 33 is adapted to move down to abut against the transmission link 4.

[0038] In this embodiment, the pressing column 33 extends into the limiting cylinder 42. Under the pushing force of the spring 5, the button 3 leaves a gap between the pressing column 33 and the bottom of the limiting cylinder 42, thereby leaving space for the transmission link 4 to float up and down. When the button 3 is subjected to downward pressure, the pressing column 33 on the button 3 moves downward to abut against the transmission link 4, preventing the transmission link 4 from floating up and down.

[0039] like Figure 3 , Figure 5 As shown, in some embodiments, the lower surface of the transmission connecting rod 4 is provided with a first vertical tooth set 41; the bottom surface of the mounting cavity 20 is provided with a second vertical tooth set 201 adapted to the first vertical tooth set 41.

[0040] In this embodiment, the first vertical tooth group 41 has a small number of vertical teeth, optionally four, while the second vertical tooth group 201 has a large number of vertical teeth, optionally twenty. This design can reduce the rotational resistance of the scale cylinder 2. A screw assembly is provided inside the transmission link 4 (the structure, installation, and function of the screw assembly are all existing technologies). The screw assembly will apply resistance to the transmission link 4. When the scale cylinder 2 rotates forward and backward to adjust the dosage, the first vertical tooth group 41 of the transmission link 4 will disengage and float up and down. When the button 3 is subjected to downward pressure, the button 3 presses down on the transmission link 4 to prevent it from floating up and down, so that the transmission link 4 rotates with the scale cylinder 2, thereby driving the screw assembly to rotate to squeeze the medicine bottle.

[0041] In some embodiments, the inner wall of the liner 11 is provided with an external thread 111; the outer wall of the graduated cylinder 2 is provided with an internal thread 22 adapted to the external thread 111.

[0042] In summary, this pen-type syringe, by setting the annular protrusion 32 to an arc shape along the axial cross-section of the pen-type syringe, makes the annular protrusion 32 and the graduated cylinder 2 in line contact. Compared with the surface contact in the prior art, the graduated cylinder 2 in this embodiment experiences less resistance when rotating relative to the button 3. At the same time, the graduated cylinder 2 adopts multi-segmented buckles 21, so that each buckle 21 extends into the annular limiting groove 31 to engage the button 3. Compared with the overall annular buckles used in the prior art, the graduated cylinder 2 and the button 3 have less contact surface in this embodiment, resulting in less resistance when they rotate relative to each other.

[0043] 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.

[0044] In this document, when an element or layer is referred to as being “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 an intermediate element or layer.

[0045] 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.

[0046] 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 apparatus in use or operation.

[0047] 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. A pen-type syringe, characterized in that, include: Pen body holder (1); A scale cylinder (2) is inserted inside the pen body cylinder (1) and can rotate relative to the pen body cylinder (1). The upper part of the scale cylinder (2) is provided with a mounting cavity (20), and the inner wall of the mounting cavity (20) is provided with at least two buckles (21). Button (3) is inserted into mounting cavity (20), and an annular limiting groove (31) is provided on the outer wall of button (3); wherein When the button (3) is connected to the scale cylinder (2), each of the buckles (21) is located in the annular limiting groove (31).

2. The pen-type syringe as described in claim 1, characterized in that, An annular protrusion (32) is formed below the annular limiting groove (31), and the annular protrusion (32) has an arc-shaped cross section along the axial direction of the pen syringe.

3. The pen-type syringe as described in claim 1, characterized in that, The cross-section of the inverted buckle (21) along the axial direction of the pen syringe is arc-shaped.

4. The pen-type syringe as described in claim 1, characterized in that, All the aforementioned inverted buckles (21) are located in the same plane and are evenly distributed along the circumference.

5. The pen-type syringe as described in claim 1, characterized in that, The number of the inverted buckles (21) is two, three, or four.

6. The pen-type syringe as described in claim 1, characterized in that, A transmission connecting rod (4) is inserted inside the graduated rotary drum (2); A spring (5) is provided inside the mounting cavity (20); wherein One end of the spring (5) abuts against the button (3), and the other end abuts against the transmission link (4).

7. The pen-type syringe as described in claim 6, characterized in that, The upper end face of the transmission connecting rod (4) has a limiting sleeve (42); wherein The upper end of the limiting cylinder (42) is open, and the lower end of the limiting cylinder (42) is closed. The button (3) has a pressing post (33) inside; The pressing column (33) is adapted to be inserted into the limiting cylinder (42) and has a gap between it and the bottom of the limiting cylinder (42); and When the button (3) is pressed, the pressing column (33) is adapted to move down to abut against the transmission link (4).

8. The pen-type syringe as described in claim 6, characterized in that, The transmission link (4) is provided with a downward-facing first vertical tooth group (41). The bottom surface of the mounting cavity (20) is provided with a second vertical tooth group (201) that is adapted to the first vertical tooth group (41).

9. The pen-type syringe as described in claim 7, characterized in that, Also includes: Lining (11); The graduated rotary cylinder (2) is inserted into the liner (11) and is threadedly engaged with the liner (11).

10. The pen-type syringe as described in claim 9, characterized in that, The inner wall of the liner (11) is provided with external threads (111). The outer wall of the graduated rotary cylinder (2) is provided with an internal thread (22) that is compatible with the external thread (111).

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