A limiting mechanism for the protective shell of an injection training pen

Abstract

This utility model relates to a limiting mechanism for the protective shell of an injection training pen, including a power component, a bracket, and a protective shell. One end of the power component has a push rod, which can be driven to move axially along the push rod. The bracket is fixed to the side of the power component near the push rod, and a channel for the push rod to pass through is provided inside the bracket. A clearance groove communicating with the channel is provided on the side of the bracket, and an elastic arm is provided within the clearance groove. The elastic arm is positioned along the length of the bracket, with a free end on the side away from the push rod and a push block located on the side of the elastic arm near the channel. The protective shell is movably fitted onto the outside of the bracket, and a limiting groove matching the elastic arm is provided on the protective shell. After a simulated injection is completed, the push rod extends into the channel of the bracket, pushing the free end of the elastic arm into the limiting groove, thus limiting the protective shell and simulating the tip protection function of a real injection pen, improving the user experience of the simulated injection pen.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a protective shell limiting mechanism for an injection training pen. Background Technology

[0002] The most common way to administer medication is by injection, usually performed by trained healthcare professionals. In some cases, such as for medications requiring regular injections, like insulin, patients can purchase an injection pen for self-injection. However, when first trying to self-inject with an injection pen, unfamiliarity with its operation often leads to improper handling and wasted medication. Therefore, training pens for simulating injections have appeared on the market.

[0003] When the injection training pen is in use, the power component is driven by pressing the protective shell to simulate injection. After the simulated injection is completed, the protective shell returns to its original position and is supported only by the return spring. This allows the protective shell to still be pressed in under external force, and it cannot achieve the needle tip protection function of an actual injection pen.

[0004] Based on the above-mentioned technical problems, this application proposes a protective shell limiting mechanism for injection training pens. Utility Model Content

[0005] The purpose of this utility model is to provide a protective shell limiting mechanism for an injection training pen to solve the technical problems mentioned in the background art. This purpose is achieved through the following technical solution:

[0006] A limiting mechanism for the protective shell of an injection training pen includes a power component, a bracket, and a protective shell. One end of the power component has a push rod, which can drive the push rod to move axially. The bracket is fixed to the side of the power component near the push rod, and a channel for the push rod to pass through is provided inside the bracket. A clearance groove communicating with the channel is provided on the side of the bracket, and an elastic arm is provided within the clearance groove. The elastic arm is positioned along the length of the bracket, with the free end on the side of the elastic arm away from the push rod. A push block is provided on the side of the elastic arm near the push rod, located on the side of the elastic arm near the channel. The protective shell is movably fitted onto the outside of the bracket, and a limiting groove matching the elastic arm is provided on the protective shell. When the push rod extends into the channel, the push rod pushes the push block, causing the free end of the elastic arm to extend into the limiting groove.

[0007] Furthermore, there are at least two elastic arms, which are evenly distributed along the circumference of the bracket. The number of limiting grooves is equal to the number of elastic arms, and the limiting grooves correspond one-to-one with the elastic arms.

[0008] Furthermore, a limit block is fixed to the free end of the elastic arm.

[0009] Furthermore, a guide groove is provided at the end of the bracket away from the power component, and an opening is provided at the end of the guide groove away from the power component; a guide block is provided on the inner side of the protective shell, and the guide block is located on the extension line of the guide groove.

[0010] Furthermore, it also includes a housing, which is divided into a first end and a second end along its axial direction. The first end of the housing has a port. A power assembly is installed at the second end of the housing, which can push a push rod toward the first end of the housing. A bracket is installed at the first end of the housing, and a protective shell is slidably installed on the outside of the bracket. One end of the protective shell extends at least partially out of the port, and the other end of the protective shell abuts against the power assembly to trigger the power assembly to push the push rod.

[0011] Furthermore, the side of the bracket is provided with a transparent window, and the outer shell has a perforated window that matches the window.

[0012] The technical solutions provided in this application have at least the following technical effects or advantages:

[0013] By fixing an elastic arm with a push block to the side of the bracket and opening a limiting groove on the side of the protective shell to cooperate with the elastic arm, after the simulated injection is completed, the push rod extends into the channel of the bracket to push the free end of the elastic arm into the limiting groove, thereby limiting the protective shell and simulating the needle tip protection function of a real injection pen, thus improving the user experience of the simulated injection pen. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the injection training pen according to an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of the power component structure according to an embodiment of this application;

[0017] Figure 3 This is a schematic diagram of the support structure according to an embodiment of this application;

[0018] Figure 4 This is a cross-sectional view of the support structure according to an embodiment of this application;

[0019] Figure 5 This is a schematic diagram of the protective shell structure according to an embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the limiting mechanism in an embodiment of this application.

[0021] Reference numerals: 1. Outer shell; 11. Front shell; 111. Port; 112. Hollowed-out window; 12. Rear shell; 2. Power assembly; 3. Bracket; 31. Locking block; 32. Elastic arm; 321. Push block; 322. Limiting block; 33. Guide groove; 34. Viewing window; 4. Protective shell; 41. Pressing part; 42. Triggering part; 43. Guide block; 44. Limiting groove; 5. Damper; 6. Push rod. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0023] like Figure 1 The illustrated protective shell limiting mechanism for an injection training pen includes an outer shell 1, a power assembly 2, a bracket 3, and a protective shell 4. The outer shell 1 is a hollow cylindrical shell, comprising a front shell 11 and a rear shell 12. The left end of the front shell 11 has a port 111. The front shell 11 and the rear shell 12 are connected by a snap-fit ​​connector, forming a hollow cylindrical structure with an open left end. The front shell 11 can also be connected to the rear shell 12 by means of threads, adhesive bonding, welding, etc., as long as a stable connection between the front shell 11 and the rear shell 12 can be achieved.

[0024] like Figure 1 , Figure 2 As shown, the power assembly 2 is fixedly installed at the right end of the housing 1, and a push rod 6 is retractably installed at the left end of the power assembly 2. The push rod 6 can move to the left along the axial direction of the housing 1 under the push of the power assembly 2. A damper 5 is installed at the left end of the power assembly 2. The damper 5 is used to slow down the push rod 6 to simulate the injection action. The structure and principle of the power assembly 2 and the damper 5 are existing technologies. As long as the push rod 5 can be pushed out slowly, it will not be described in detail here.

[0025] like Figure 1 , Figure 3 , Figure 4As shown, the bracket 3 is a tubular structure. Two locking blocks 31 are symmetrically fixed to the right end of the bracket 3, and the bracket 3 is fixed inside the front housing 11 via the locking blocks 31. A channel for the push rod 6 to pass through is provided inside the bracket 3. Two clearance grooves communicating with the channel are symmetrically opened in the middle of the side wall of the bracket 3. Elastic arms 32 are installed in each of the two clearance grooves. The elastic arms 32 are installed along the length of the bracket 1. The left end of the elastic arm 32 is a free end, and a push block 321 is fixed to the right end of the elastic arm 32. The push block 321 is located on the side of the elastic arm 32 closest to the channel, and the distance between the two push blocks 321 is less than the outer diameter of the push rod 6. When the push rod 6 extends into the channel, the push rod 6 pushes the push block 321, causing the free end of the elastic arm 32 to extend outward. A guide groove 33 is provided at the left end of the bracket 3, and the left end of the guide groove 33 penetrates the left end face of the bracket 3 to form an opening.

[0026] Preferably, the side of the bracket 3 is symmetrically provided with transparent windows 34, and the side of the front housing 11 is provided with a hollow window 112 that matches the windows 34. The travel of the push rod 6 in the bracket 3 can be observed through the windows 34, so as to achieve the effect of simulating injection from a visual perspective.

[0027] like Figure 1 , Figure 5 As shown, the protective shell 4 is slidably installed inside the outer shell 1. The protective shell 4 includes a pressing part 41 and a trigger part 42. The pressing part 41 is a cylindrical shell that extends out of the port of the outer shell 1. Two trigger parts 42 are symmetrically installed at the right end of the pressing part 41. The two trigger parts 42 pass through the bracket 3 to the right and abut against the power component 2. When the pressing part is pressed to the right, the trigger part 42 triggers the power component 2 to move, causing the push rod 6 to move to the left. A clearance groove is provided between the two trigger parts 42, and the viewing window 34 of the bracket 3 is located in the clearance groove.

[0028] like Figure 5 As shown, guide blocks 43 are fixed to the inner surfaces of the left ends of the two trigger parts 42, and the guide blocks 43 are located on the extension line of the guide groove 33. When the pressing part 41 is driven, the guide blocks 43 move to the right along the guide groove 33 and abut against the bottom of the guide groove 33, limiting the pressing depth of the protective shell 4 to avoid damage to the injection training pen caused by excessive pressing.

[0029] like Figures 3-6 As shown, the trigger part 42 has a limiting groove 44 in the middle that matches the elastic arm 32. When the push rod 6 is inserted into the channel, the push rod 6 pushes the push block 321 to make the free end of the elastic arm 32 extend outward and lock into the limiting groove 44, so that the protective shell 4 cannot move to the right, thereby simulating the needle tip protection situation after the actual injection pen has finished injecting. Preferably, the free end of the elastic arm 32 is fixed with a limiting block 322 to increase the size of the free end of the elastic arm 32 and prevent the elastic arm 32 from slipping off the limiting groove 44.

[0030] The technical solutions provided in this application have at least the following technical effects or advantages:

[0031] By fixing an elastic arm with a push block to the side of the bracket and opening a limiting groove on the side of the protective shell to cooperate with the elastic arm, after the simulated injection is completed, the push rod extends into the channel of the bracket to push the free end of the elastic arm into the limiting groove, thereby limiting the protective shell and simulating the needle tip protection function of a real injection pen, thus improving the user experience of the simulated injection pen.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A limiting mechanism for the protective shell of an injection training pen, characterized in that, include: A power assembly, one end of which is provided with a push rod, the power assembly being capable of driving the push rod to move along the axial direction of the push rod; A bracket is fixed to the side of the power assembly near the push rod. The bracket has a channel for the push rod to pass through. A clearance groove communicating with the channel is provided on the side of the bracket. An elastic arm is provided in the clearance groove. The elastic arm is arranged along the length of the bracket. The side of the elastic arm away from the push rod is a free end. A push block is provided on the side of the elastic arm near the push rod. The push block is located on the side of the elastic arm near the channel. A protective shell is movably fitted onto the outside of the bracket. The protective shell has a limiting groove that matches the elastic arm. When the push rod extends into the channel, the push rod pushes the push block to extend the free end of the elastic arm into the limiting groove.

2. A mechanism for limiting the movement of a protective case for an injection training pen according to claim 1, characterized in that There are at least two elastic arms, which are evenly distributed along the circumference of the bracket. The number of limiting grooves is equal to the number of elastic arms, and each limiting groove corresponds to one elastic arm.

3. A mechanism for limiting the movement of a protective case for an injection training pen according to claim 1, characterized in that A limit block is fixed to the free end of the elastic arm.

4. A mechanism for limiting the movement of a protective case for an injection training pen according to claim 1, characterized in that The bracket has a guide groove at one end away from the power component, and the guide groove has an opening at the other end away from the power component; a guide block is provided on the inner side of the protective shell, and the guide block is located on the extension line of the guide groove.

5. The limiting mechanism for the protective shell of an injection training pen according to claim 1, characterized in that, It also includes a housing, which is divided into a first end and a second end along its axial direction. The first end of the housing has a port. The power assembly is installed at the second end of the housing and can push the push rod toward the first end of the housing. The bracket is installed at the first end of the housing, and the protective shell is slidably installed on the outside of the bracket. One end of the protective shell extends at least partially out of the port, and the other end of the protective shell abuts against the power assembly to trigger the power assembly to push the push rod.

6. A limit mechanism for a protective case for an injection training pen according to claim 5, characterized in that The bracket has a transparent window on its side, and the outer shell has a perforated window that matches the window.

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