Safety switch structure of injection pen

Abstract

The utility model discloses a safety switch structure of an injection pen, which relates to the technical field of injection pens and comprises a positioning pin arranged on the surface of a pen body, a push rod is arranged in the pen body, and a positioning groove is formed in the outer surface of the push rod and used for being matched with the positioning pin to lock or unlock the push rod. Through the arrangement of the positioning pin and the positioning groove, the injection pen is provided with a safety switch structure, locking or unlocking of the push rod is achieved, and the situation that the injection pen is possibly triggered to act due to external force, liquid medicine is wasted, and follow-up use is affected is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection pen technical field, concretely relates to injection pen safety switch structure. BACKGROUND

[0002] Injection pen refers to the insulin injection device containing pre-sealed needle, after pulling the rubber plug sleeved outside the needle, the needle is stabbed into the human body, the button at the rear end of the injection pen is pressed to drive the push rod, the driving mechanism in the injection pen drives the piston in the needle tube to move, and the medicament in the needle tube is injected into the human body through the needle;

[0003] However, the existing injection pen lacks a safety switch structure, and the push rod cannot be locked, so that the injection pen may be triggered by external force, causing liquid waste and affecting subsequent use. Therefore, a safety switch structure is needed to act on the injection pen to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at designing injection pen safety switch structure, solves the problem of the existing injection pen lacking safety switch structure in the above background art.

[0005] In order to realize the above utility model purposes, the utility model provides the following technical scheme:

[0006] The injection pen safety switch structure comprises a positioning pin arranged on the surface of the pen body, a push rod arranged in the pen body, and a positioning groove arranged on the outer surface of the push rod, which is used for locking or unlocking the push rod. The positioning pin and the positioning groove are arranged to provide the injection pen with a safety switch structure, realize the locking or unlocking of the push rod, avoid the triggering of the injection pen by external force, cause liquid waste, and affect subsequent use.

[0007] Preferably, the positioning groove comprises a locking groove and a movable groove arranged on the surface of the push rod. When the positioning pin is located in the locking groove, the push rod is locked. When the positioning pin is located in the movable groove, the push rod can move freely.

[0008] The bottom surface of the locking groove is in complete communication with the left side of the top surface of the movable groove. The movable groove and the left side of the bottom surface of the locking groove are connected through a transition slope. The movable groove and the right side of the bottom surface of the locking groove are connected through a limiting slope. The locking groove and the movable groove are in communication with each other, so that the positioning pin can move back and forth between the locking groove and the movable groove for adjustment. The structure is reasonable.

[0009] Meanwhile, through the design of the transition slope, the positioning pin is relatively smooth when moving from the movable slot to the locking slot, and through the design of the limiting slope, the positioning pin needs to exert a certain external force when moving from the locking slot to the movable slot, thereby guaranteeing the locking effect; the junction between the locking slot and the limiting slope is in an arc chamfer shape, used for supporting the stable insertion of the positioning pin in the locking slot without external force, thereby further guaranteeing the locking of the positioning pin.

[0010] Preferably, the locking slot and the movable slot are both in a waist round shape, through the design of the waist round shape, the positioning pin is adapted, and the positioning pin is convenient to move in the locking slot and the movable slot; the length of the movable slot is greater than the length of the locking slot, so that the positioning pin can move in the movable slot, thereby ensuring that the push rod has enough distance to move.

[0011] Preferably, the surface end of the pen body is fixed with a supporting sheet, the supporting sheet is provided with an opening matched with the positioning pin, the opening is in a waist round shape, the opening in the waist round shape is designed to adapt to the movement of the positioning pin; the opening is arranged in cooperation with the locking slot and the movable slot, thereby further cooperating to ensure the movement of the positioning pin.

[0012] Preferably, the positioning pin comprises a positioning rod, the positioning rod penetrates through the opening and is inserted into the locking slot, thereby realizing the locking of the push rod; the top of the positioning rod is fixed with a tab, and the surface of the positioning rod between the supporting sheet and the pen body is provided with a card, thereby playing a limiting protection role on the positioning pin and avoiding the falling of the positioning pin.

[0013] Preferably, the connection mode between the card and the positioning rod comprises a split type connection; the surface of the positioning rod is provided with an external thread, the inner side of the card is provided with an internal thread matched with the external thread, the positioning rod and the card are convenient to install and disassemble through the thread connection; the height of the external thread is equal to the height of the card, so that the positioning rod and the card are threadedly connected, meanwhile, the surface of the positioning rod located in the positioning slot is prevented from generating large friction with the positioning slot due to the thread, thereby further causing the interference of the movement of the push rod and affecting the injection effect.

[0014] Preferably, the connection mode between the card and the positioning rod comprises an integral type connection; the positioning rod and the card are fixed.

[0015] Preferably, the outer side of the card is bonded with a positioning convex ring, the outer side edge of the positioning convex ring is in a circular arc shape, the positioning convex ring is made of rubber material, through the design of the positioning convex ring made of rubber material, the card can move from one side of the opening to the other side of the opening under the deformation of the positioning convex ring, and after moving, the positioning convex ring is restored under the restoring force, thereby realizing the limiting of the positioning pin.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The utility model discloses through the design of positioning pin and positioning groove, make the injection pen have safety switch structure, realized the locking or the unblocking of push rod, avoid making injection pen possibly trigger action because of external force, cause liquid medicine waste, influence subsequent use;

[0018] The utility model discloses through the design of card and positioning convex ring, realize the location of positioning pin, make positioning pin can stably insert in the locking or the unblocking operation of positioning groove, guarantee the normal operation of safety switch structure in the utility model, and through the design of positioning convex ring made of rubber material, guarantee the convenience of positioning pin overall installation and disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure front view schematic drawing of injection pen;

[0020] Figure 2 It is the structure front view schematic drawing of the utility model;

[0021] Figure 3 It is the structure front view schematic drawing of positioning groove in the utility model;

[0022] Figure 4 It is the structure bottom view schematic drawing of positioning pin in the utility model;

[0023] Figure 5 It is the structure bottom view schematic drawing of positioning pin in the utility model.

[0024] Mark in the drawing:

[0025] 100, pen body;110, support piece;111, opening;120, push rod;121, positioning groove;122, locking groove;123, movable slot;124, transition inclined surface;125, limiting inclined surface;210, positioning pin;211, push piece;212, positioning rod;213, card;214, external thread;215, internal thread;216, positioning convex ring. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantage of the utility model embodiment more clear, below, the technical scheme in the utility model embodiment will be clearly and completely described with the drawings, obviously, the described embodiment is the embodiment of the utility model, instead of all the embodiments.

[0027] Therefore, the following detailed description of embodiments of the present application is not intended to limit the scope of the claimed application, but merely to indicate some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] Embodiments of the present application are:

[0031] Referring to Figures 1-5 The injection pen safety switch structure includes a positioning pin 210 and a positioning groove 121; the end of the pen body 100 is fixed with a card 110, the positioning pin 210 is arranged outside the card 110 and penetrates into the inside of the pen body 100; the card 110 is provided with an opening 111 matched with the positioning pin 210, and the opening 111 is in the shape of a waist circle; the inside of the pen body 100 is provided with a push rod 120, and the positioning groove 121 is fixed on the outer surface of the push rod 120, and the positioning pin 210 is inserted into the inside of the positioning groove 121;

[0032] The positioning groove 121 includes a locking groove 122 and a movable groove 123 respectively mounted on the surface of the push rod 120, and the locking groove 122 and the movable groove 123 are both in the shape of a waist circle; the length of the movable groove 123 is greater than the length of the locking groove 122;

[0033] The bottom surface of the locking groove 122 is completely communicated with the left side of the top surface of the movable groove 123, the left side of the bottom surface of the movable groove 123 and the locking groove 122 is connected through a transition slope 124, and the right side of the bottom surface of the movable groove 123 and the locking groove 122 is connected through a limiting slope 125; the joint between the locking groove 122 and the limiting slope 125 is in the shape of an arc chamfer;

[0034] When the locking is released, the steps are as follows:

[0035] First, the positioning pin 210 is pushed down, at this time, the positioning pin 210 will move from the upper part of the opening 111 to the lower part of the opening 111, that is, the positioning pin 210 moves from the locking groove 122 in the positioning groove 121 to the movable groove 123, because the movable groove 123 has a certain length (the length is set according to actual needs in the factory production stage, for the purpose of matching the movement of the push rod 120), therefore, the push rod 120 will obtain a corresponding length of movement distance, and the push rod 120 is released from the locking;

[0036] When the push rod 120 needs to be locked, that is, the push rod 120 is restored to the original position, at this time, the positioning pin 210 also moves from the right side to the left side of the movable groove 123, and under the action of the transition slope 124, the positioning pin 210 is repositioned to the inside of the locking groove 122, and when the positioning pin 210 moves to the right side of the inside of the locking groove 122, it is limited and blocked by the limiting slope 125, at this time, the positioning pin 210 will be repositioned from the lower part of the opening 111 to the upper part of the opening 111, achieving the relocking of the push rod 120;

[0037] In the above, the positioning pin 210 includes a positioning rod 212, the positioning rod 212 penetrates the opening 111 and is inserted into the locking groove 122; the top of the positioning rod 212 is fixed with a push piece 211, the surface of the positioning rod 212 between the support piece 110 and the pen body 100 is provided with a card 213, through the design of the card 213, the positioning pin 210 is limited and protected, avoiding falling off; the diameter of the card 213 is greater than the diameter of the opening 111, but the card 213 can pass through the opening 111 under the action of extrusion force;

[0038] Meanwhile, the connection mode of the card 213 and the positioning rod 212 includes threaded connection and fixed connection, wherein when the card 213 and the positioning 212 are threaded connected: the surface of the positioning rod 212 is provided with external threads 214, the inner side of the card 213 is provided with internal threads 215 matched with the external threads 214, through the threaded connection, the positioning rod 212 and the card 213 are convenient to install and disassemble, at this time, the height of the external threads 214 is equal to the height of the card 213, meeting the threaded connection of the positioning rod 212 and the card 213, avoiding that the surface of the positioning rod 212 located in the positioning groove 121 generates large friction with the positioning groove 121 due to the threads, thereby interfering with the movement of the push rod 120, affecting the injection effect;

[0039] And no matter whether the card 213 and the positioning rod 212 are threaded connected or fixed connected, the outer side of the card 213 is bonded with a positioning convex ring 216, the outer side of the positioning convex ring 216 is arc-shaped, the positioning convex ring 216 is made of rubber material, through the design of the positioning convex ring 216 made of rubber material, the card 213 can move from one side of the opening 111 to the other side of the opening 111 under the deformation of the positioning convex ring 216, and after moving, the positioning convex ring 216 restores under the action of restoring force, achieving the limiting of the positioning pin 210.

[0040] In the description of the utility model, it is necessary to explain that the position or location relation indicated by the terms "upper", "lower" and the like is the position or location relation shown based on the drawings or the position or location relation commonly understood by the person skilled in the art, and such terms are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0041] The above embodiments are only used to illustrate the utility model and not to limit the technical solutions described in the utility model. Although the utility model has been described in detail with reference to the above embodiments, the utility model is not limited to the above specific embodiments, and therefore any modification or equivalent replacement of the utility model; and all technical solutions and improvements that do not deviate from the spirit and scope of the utility model are covered in the scope of the claims of the utility model.

Claims

1. A safety switch structure for an injection pen, characterized in that The application relates to a pen body (100) provided with a positioning pin (210) on the surface of the pen body (100), wherein the pen body (100) is internally provided with a push rod (120), the outer surface of the push rod (120) is provided with a positioning groove (121), and the positioning groove (121) is used for locking or unlocking the push rod (120) by matching the positioning pin (210).

2. The injection pen safety switch structure according to claim 1, characterized in that The positioning groove (121) comprises a locking groove (122) and a movable groove (123) respectively arranged on the surface of the push rod (120), the bottom surface of the locking groove (122) is completely communicated with the top surface of the left side of the movable groove (123), the bottom surface of the movable groove (123) and the bottom surface of the locking groove (122) are connected through a transition slope (124) at the left side, and the bottom surface of the movable groove (123) and the bottom surface of the locking groove (122) are connected through a limiting slope (125) at the right side; the joint of the locking groove (122) and the limiting slope (125) is in an arc-shaped chamfer shape, and is used for stably inserting the positioning pin (210) into the locking groove (122) without external force.

3. The injection pen safety switch structure according to claim 2, characterized in that The locking groove (122) and the movable groove (123) are both in a waist-round shape; the length of the movable groove (123) is greater than the length of the locking groove (122).

4. The injection pen safety switch structure according to claim 3, characterized in that The surface end of the pen body (100) is fixedly provided with a supporting sheet (110), the supporting sheet (110) is provided with an opening (111) matched with the positioning pin (210), the opening (111) is in a waist-round shape, and the opening (111) is arranged in cooperation with the locking groove (122) and the movable groove (123).

5. The injection pen safety switch structure according to claim 4, characterized in that The positioning pin (210) comprises a positioning rod (212), the positioning rod (212) penetrates through the opening (111) and is inserted into the locking groove (122); the top of the positioning rod (212) is fixedly provided with a pushing sheet (211), and the surface of the positioning rod (212) between the supporting sheet (110) and the pen body (100) is provided with a clamping sheet (213).

6. The injection pen safety switch structure according to claim 5, characterized in that The connecting mode between the clamping sheet (213) and the positioning rod (212) comprises a split type connection; the surface of the positioning rod (212) is provided with an external thread (214), the inner side of the clamping sheet (213) is provided with an internal thread (215) matched with the external thread (214), and the height of the external thread (214) is equal to the height of the clamping sheet (213).

7. The injection pen safety switch structure according to claim 5, characterized in that The connecting mode between the clamping sheet (213) and the positioning rod (212) comprises an integral type connection; the positioning rod (212) and the clamping sheet (213) are fixed.

8. An injection pen safety switch structure according to either one of claims 6 or 7, characterized in that, The outer side of the clamping sheet (213) is attached with a positioning convex ring (216), the outer side of the positioning convex ring (216) is in an arc shape, and the positioning convex ring (216) is made of rubber.

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