A new plunger for an injection pen

Abstract

The utility model relates to injection device technical field more specifically is a kind of new push rod for injection pen, including stem, the inner hole of filling spring is provided at the top of stem, the lower end of stem is provided with conical boss, the both sides of stem are symmetrically provided with multiple for limiting push rod sliding ear hook;The side end of the outer surface of ear hook is provided with support inclined plane;The utility model has the beneficial effects that the use of pre-filled syringe is often limited to the size limitation of pre-filled syringe matched with push rod and the installation space of spring reserved in the middle, the wall of push rod is very thin, if hole or ring groove is further opened on this basis, it can lead to the space of fixed push rod is very small, the current unilateral 0.3mm or so, it is not easy to fix, thereby causing trigger in the process of transportation or falling;The strength of push rod itself is insufficient, the requirement on product material is very high, the precision requirement of product is high, increases the manufacturing cost of parts and a series of technical problems.

Description

Technical Field

[0001] This utility model relates to the field of injection device technology, and more specifically to a novel push rod for an injection pen. Background Technology

[0002] The use of pre-filled syringes is often limited by the size of the pre-filled syringe that mates with the plunger and the need to reserve space for the spring installation. The plunger wall is very thin, and if holes or grooves are made on top of that, the space for fixing the plunger will be very small.

[0003] Similar to a syringe with patent number CN201920150924.8, this syringe includes a barrel with a needle connector, and the barrel has a first bore portion and a second bore portion inside; a plunger disposed in the first bore portion; a plunger rod disposed in the barrel, with an array of notches and / or protrusions symmetrically arranged along at least a portion of its length; an insert disposed in the second bore portion, which has a cross-shaped opening for the plunger rod to pass through, and fingers disposed in two grooves located on the same straight line, the fingers engaging the array of notches and / or protrusions on the plunger rod during use; at least two screw holes are provided on the side wall of the barrel where the second bore portion is located, and the annular side wall of the insert installed in the second bore portion has a mating internal thread hole that matches the screw holes, and screws for fixing the insert are provided on the side wall of the barrel where the second bore portion is located. This syringe uses screws to reinforce the installation of the insert, effectively improving the stability and reliability of the insert installation.

[0004] Therefore, the existing technical solutions have shortcomings. Currently, the thickness is only about 0.3mm on one side, which makes it easy to lose stability and cause triggering during transportation or drops. The strength of the push rod itself is also insufficient, and the product has high requirements for materials and precision, which increases the manufacturing cost of the parts. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the limitations of the prior art, such as the size of the pre-filled syringe that cooperates with the push rod, the need to reserve space for the spring installation, the thin wall of the push rod, and the small space for fixing the push rod if holes or grooves are made on it, which is currently about 0.3mm on each side, making it easy to fail to fix it, thus causing triggering during transportation or drops; the push rod itself is also not strong enough, and the product materials and precision requirements are very high, which increases the manufacturing cost of the parts, and a series of other technical problems.

[0006] Therefore, the technical solution adopted is a novel push rod for an injection pen, comprising a rod body, an inner hole for filling a spring at the top end of the rod body, a tapered boss at the bottom end of the rod body, and multiple lugs symmetrically arranged on both sides of the rod body for limiting the sliding of the push rod.

[0007] Preferably, the outer surface of the ear is provided with a supporting slope, which is used to hang the main body of the injection pen.

[0008] Preferably, the outer surface of the ear loop is provided with a lateral support platform for storing energy in the injection pen, and one side of the support slope is adjacent to the lateral support platform.

[0009] Preferably, the outer surface of the ear is provided with a guide slope and a guide fillet for guiding, the lateral support platform is adjacent to the guide slope, and the guide slope is adjacent to the guide fillet.

[0010] Preferably, the outer surface of the ear is provided with an injection fillet at one end. The injection fillet is used to define the inclined surface of the guide support slope that is attached to the main body in the injection pen. The injection fillet is adjacent to the other side of the support slope.

[0011] Preferably, a spring is provided inside the inner hole, the spring is sleeved on the guide pin, and the spring is positioned between the guide pin and the rod body.

[0012] Preferably, the rod is attached to the sound block via a hook.

[0013] Preferably, the outer side of the sound block is slidably connected to the slider, and a fixing block is engaged between the top of the sound block and the top of the slider.

[0014] Preferably, the slider is provided with a baffle to limit the movement of the hanging ear.

[0015] Preferably, the rod body is assembled with a spring, a fixing block, a guide pin, a sound block, and a slider to form an injection pen.

[0016] 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 may be realized and obtained through the structures particularly pointed out in this application.

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the first direction structure of the rod body of this utility model;

[0020] Figure 2 This is a schematic diagram of the second-direction structure of the rod body of this utility model;

[0021] Figure 3 This is an exploded view of the assembly of the injection pen of this utility model;

[0022] Figure 4 This is a schematic diagram of the connecting structure of the hook of this utility model. Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the connecting structure of the hook of this utility model. Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the connecting structure of the hook of this utility model. Figure 3 ;

[0025] Figure 7 This is a schematic diagram of the internal shape and structure of the ear loop of this utility model.

[0026] In the diagram: rod 1; inner hole 2; hanging lug 3; support ramp 3.1; lateral support platform 3.2; guide ramp 3.3; guide fillet 3.4; injection fillet 3.5; conical boss 4; spring 200; fixing block 300; guide pin 400; sound block 500; slider 600. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this application, it should be understood that the terms "middle," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Specific implementation method one:

[0032] like Figure 1 and Figure 2 As shown, a novel plunger for an injection pen includes a rod body 1, with an inner hole 2 for loading a spring 200 at the top end of the rod body 1, a tapered boss 4 at the bottom end of the rod body 1, and multiple lugs 3 symmetrically arranged on both sides of the rod body 1 to limit the sliding of the plunger.

[0033] The working principle and beneficial effects of this embodiment are as follows: Most of the injection pens on the market currently use symmetrical holes or annular grooves as the plunger.

[0034] Due to the size limitations of the PFS that mates with the push rod and the need to reserve space for the spring installation, the push rod wall is very thin. If holes or grooves are made on this basis as shown in the figure above, the space for fixing the push rod will be very small, currently about 0.3mm on each side, which makes it easy to fail to fix it, thus causing triggering during transportation or drops.

[0035] When this device is applied to a syringe, when the lug 3 of the rod 1 is attached to the guide slope of the sound block 500, the baffle of the slider 600 simultaneously enters the channel of the sound block 500, preventing the rod 1 from moving forward and solving the problem of accidental triggering of the syringe's power unit. The rod 1 has no grooves, which increases its strength, reduces the risk of breakage during long-term storage, extends the service life of the syringe, reduces the requirements for structural manufacturing precision, and reduces production costs.

[0036] The inner hole 2 can serve as the mounting space for the spring 200, thereby saving the mounting space for the spring and shortening the overall length of the pen;

[0037] The plunger in this design is used in an injection pen to advance the rubber stopper to achieve drug delivery.

[0038] Because the push rod is restricted by a baffle, the machining accuracy of the push rod is reduced, thereby improving the product yield.

[0039] Because the push rod is limited by a baffle, the problem of easy triggering during transportation or drops of previous products has been solved.

[0040] This solves the problem of high precision requirements for the push rod in current injection pen movements;

[0041] This solves the problem of accidental automatic triggering of current injection pens;

[0042] The problem of insufficient push rod strength has been solved;

[0043] This solved the problem of high costs. Specific Implementation Method Two:

[0045] like Figure 1 — Figure 7 As shown, a novel push rod for an injection pen is provided with a supporting inclined surface 3.1 on the side end of the outer surface of the hanging ear 3. The supporting inclined surface 3.1 is used to hang the inclined surface of the main body in the injection pen.

[0046] The working principle and beneficial effects of this embodiment are as follows: the supporting inclined surface 3.1 in the two hanging ears 3 is connected to the inclined surface of the main body in the injection pen. During the assembly process, the guide inclined surface 3.3 and the guide rounded corner 3.4 play a guiding role and will not interfere with the baffle. Specific implementation method three:

[0048] like Figure 1 — Figure 7 As shown, a novel push rod for an injection pen is provided on the side end of the outer surface of the lug 3 for storing energy in the injection pen, and one side of the support slope 3.1 is adjacent to the lateral support platform 3.2.

[0049] The working principle and beneficial effects of this embodiment are as follows: After assembly, under the action of the supporting inclined surface 3.1 and the spring 200, the lateral supporting platform 3.2 contacts the baffle, realizing the compression of the spring 200 to achieve energy storage. Specific implementation method four:

[0051] like Figure 1 — Figure 7As shown, a novel push rod for an injection pen is provided on the side end of the outer surface of the lug 3, which has a guide slope 3.3 and a guide fillet 3.4 for guiding. The lateral support platform 3.2 is adjacent to the guide slope 3.3, and the guide slope 3.3 is adjacent to the guide fillet 3.4.

[0052] The working principle and beneficial effects of this embodiment are as follows: the main function of the guide slope 3.3 and the guide fillet 3.4 is to guide the sliding and prevent interference and offset. Specific implementation method five:

[0054] like Figure 1 — Figure 7 As shown, a novel push rod for an injection pen is provided with an injection fillet 3.5 on the side end of the outer surface of the lug 3. The injection fillet 3.5 is used to define the inclined surface of the guide support slope 3.1 that is attached to the main body of the injection pen. The injection fillet 3.5 is adjacent to the other side of the support slope 3.1.

[0055] The working principle and beneficial effects of this embodiment are as follows: during the energy release process, the energy is guided by the guide slope 3.3 and the guide rounded corner 3.4 to enter the injection rounded corner 3.5, and the support slope 3.1 is hooked onto the slope of the main body in the injection pen through the injection rounded corner 3.5. Specific implementation method six:

[0057] like Figure 1 — Figure 7 As shown, a novel push rod for an injection pen is provided, wherein a spring 200 is provided in the inner hole 2, the spring 200 is sleeved on the guide pin 400, and the spring 200 is disposed between the guide pin 400 and the rod body 1.

[0058] The working principle and beneficial effects of this embodiment are as follows: the spring 200 is placed between the guide pin 400 and the rod 1 to provide kinetic energy for the use of the entire syringe. Specific implementation method seven:

[0060] like Figure 1 — Figure 7 As shown, a novel plunger for an injection pen, wherein the plunger 1 is attached to a sound block 500 via a lug 3;

[0061] The outer side of the sound block 500 is slidably connected to the slider 600, and a fixing block 300 is engaged between the top of the sound block 500 and the top of the slider 600.

[0062] The slider 600 is provided with a baffle to limit the position of the lug 3;

[0063] The rod 1 is assembled with a spring 200, a fixing block 300, a guide pin 400, a sound block 500, and a slider 600 to form an injection pen.

[0064] The working principle and beneficial effects of this embodiment are as follows: The specific assembly process is as follows:

[0065] Insert the sound block 500 into the slider 600. As the sound block 500 is inserted, put the fixing block 300 on the sound block 500.

[0066] Insert the guide pin 400 into the sound block 500, install the end of the guide pin 400 on the inner wall of the sound block 500, and ensure that the guide pin 400 does not wobble and extends out of the sound block 500.

[0067] The center of the spring 200 is fitted onto the guide pin 400. The spring 200 can also be an elastic reset element such as urethane. One end of the spring 200 is connected to the end of the guide pin 400, and the other end extends out of the sound block 500. The length of the spring 200 in its free state is greater than the length of the guide pin 400.

[0068] Place the rod 1 onto the spring 200, press the spring 200, pass it through the sound block 500, rotate the spring 200, and hook the lug 3 of the spring 200 onto the guide slope of the sound block 500.

[0069] Pressing the rod 1 causes the spring 200 to abut against the top of the inner wall of the rod 1. The lug 3 of the rod 1 is aligned with the channel. As the rod 1 is pressed, the spring 200 is pre-compressed. The lug 3 slides along the channel until it enters the limiting groove. Rotating the rod 1 causes the lug 3 to leave the channel and hook onto the guide slope. The lug 3 is supported by the slope 3.1, the lateral support platform 3.2, the guide slope 3.3, the guide fillet 3.4, and the injection fillet 3.5, which are designed to suit different usage scenarios and environments.

[0070] Push slider 600 upwards and insert the two baffles of slider 600 into the channels of sound block 500 to complete the assembly;

[0071] Push the slider 600 upwards, and the loop 3 abuts against the side of the baffle, limiting the baffle 13 so that the loop 3 cannot move, thus completing the assembly of the syringe.

[0072] The above description is not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model are also within the protection scope of the present utility model.

Claims

1. A novel plunger for an injection pen, characterized in that: The rod (1) includes a rod body (1), the top of the rod body (1) is provided with an inner hole (2) for filling spring (200), the bottom of the rod body (1) is provided with a conical boss (4), and multiple lugs (3) for limiting the sliding of the push rod are symmetrically provided on both sides of the rod body (1).

2. The novel plunger for an injection pen according to claim 1, characterized in that: The outer surface of the ear (3) is provided with a support slope (3.1), which is used to hang the main body of the injection pen.

3. A novel plunger for an injection pen according to claim 2, characterized in that: The outer surface of the ear (3) is provided with a lateral support platform (3.2) for storing energy in the injection pen, and one side of the support slope (3.1) is adjacent to the lateral support platform (3.2).

4. A novel plunger for an injection pen according to claim 3, characterized in that: The outer surface of the ear (3) is provided with a guide slope (3.3) and a guide fillet (3.4) for guiding. The lateral support platform (3.2) is adjacent to the guide slope (3.3), and the guide slope (3.3) is adjacent to the guide fillet (3.4).

5. A novel plunger for an injection pen according to claim 4, characterized in that: The outer surface of the ear (3) is provided with an injection fillet (3.5). The injection fillet (3.5) is used to define the inclined surface of the guide support slope (3.1) that is attached to the main body of the injection pen. The injection fillet (3.5) is adjacent to the other side of the support slope (3.1).

6. A novel plunger for an injection pen according to claim 1, characterized in that: A spring (200) is provided inside the inner hole (2). The spring (200) is sleeved on the guide pin (400) and is located between the guide pin (400) and the rod (1).

7. A novel plunger for an injection pen according to claim 6, characterized in that: The rod (1) is attached to the sound block (500) by means of the lug (3).

8. A novel plunger for an injection pen according to claim 7, characterized in that: The outer side of the sound block (500) is slidably connected to the slider (600), and a fixing block (300) is engaged between the top of the sound block (500) and the top of the slider (600).

9. A novel plunger for an injection pen according to claim 8, characterized in that: The slider (600) is provided with a baffle to limit the position of the lug (3).

10. A novel plunger for an injection pen according to claim 9, characterized in that: The rod (1) is assembled with a spring (200), a fixing block (300), a guide pin (400), a sound block (500), and a slider (600) to form an injection pen.

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