CN211410495U

CN211410495U - Disposable automatic injection pen with automatic needle withdrawing function

Info

Publication number: CN211410495U
Application number: CN201922228056.3U
Authority: CN
Inventors: 陆晨
Original assignee: Shanghai Yuanyugu Medical Equipment Technology Co ltd
Current assignee: Shanghai Fareast International Group Trading Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-09-04
Anticipated expiration: 2029-12-09

Abstract

The utility model discloses a disposable automatic injection pen with automatic needle withdrawing function, which comprises a button and a pen holder, wherein the button has the functions of injection opening safety and excitation injection, a thrust spring, an injection push rod with the excitation needle withdrawing push rod, a needle pre-encapsulation injector frame and a needle withdrawing spring are arranged inside the pen holder, a pen cap is arranged at the bottom of the pen holder, after the pen cap is removed, the injection pen is rotationally opened and presses the button, the button excites a thrust spring lock disc and opens a thrust spring lock catch, the push rod pushes a piston in a medicine bottle after being stressed to start automatic injection, the pre-encapsulation injector frame on the needle withdrawing mechanism and the whole thrust spring mechanism return 10mm under the action of the needle withdrawing spring to return a needle head into the pen holder, in the utility model, the physical parameters of the spring and the length of the push rod are changed, different injection dosages and speeds can be realized, and the injection needle can be automatically withdrawn after injection, the safety of the user is ensured, or the user can injure the injector after discarding the injector without safe disposal.

Description

Disposable automatic injection pen with automatic needle withdrawing function

Technical Field

The utility model relates to an injection pen technical field specifically is a disposable automatic injection pen of automatic needle function of moving back in area.

Background

The injection pen is used for injecting water-injection medicaments, before the injection pen is used, whether the injection pen is suitable for use needs to be approved by professionals, the injection pen is a device for realizing automatic injection by converting power stored in the injection pen into pressure, and after injection is completed, the injection needle automatically returns to a pen holder to avoid secondary contact and injury. The prior pre-encapsulated syringe with a needle is widely applied to the aspect of injecting water needle medicines, but the injection pen has the following defects in use, firstly, the injection speed needs to be controlled when the syringe is injected; secondly, when the injector injects, the liquid medicine needs to be pushed laboriously; finally, syringe injections require professional personnel.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a take disposable automatic injection pen of automatic needle function of moving back, the utility model discloses in will taking the needle embedment syringe in advance to put into the injection pen, when needs, under emergency, patient can carry out automatic injection by oneself very much, but the problem among the prior art can be solved to safe handling after the injection.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the disposable automatic injection pen with the automatic needle withdrawing function comprises a button and a pen holder, wherein the button is arranged inside the pen holder, a circular arc-shaped thrust excitation rod end is installed on the button, a thrust spring lock disc is arranged below the thrust excitation rod end, a push rod is arranged in the middle of the thrust spring lock disc, a thrust spring is installed on the push rod, a spring sleeve is arranged below the thrust spring lock disc and surrounds the thrust spring, the thrust spring is a truncated cone spiral spring, a needle withdrawing spring lock disc is arranged below the push rod carried by the side face of the push rod, a PFS upper frame is arranged below the needle withdrawing spring lock disc and connected with the spring sleeve, the PFS upper frame is connected with a PFS lower frame through a hook, a needle pushing spring is installed on the PFS lower frame, and a needle-containing pre-encapsulation injector is arranged in the middle of the PFS lower frame.

Furthermore, the thrust spring lock disc is buckled with a thrust excitation rod end, an L-shaped groove on the side surface of the button and a phi 2x1mm at the upper end of the penholder to form a double-safety structure.

Furthermore, the push rod, the thrust spring lock disc and the spring sleeve form a spring pre-tightening and locking structure.

Further, the needle withdrawing spring lock disc and the PFS upper frame form a locking force structure.

Furthermore, a spring pre-tightening structure consisting of two arc-shaped long hooks is arranged between the PFS upper frame and the PFS lower frame.

Furthermore, the push rod is of an arc-shaped push rod structure, the top end of the push rod is provided with three hooks, and the middle of the push rod is provided with an excitation spring.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. in the utility model, the structural design of the disc lock catch is adopted, so that the central shaft of the push rod is clamped and can not move axially; and because the truncated cone spiral spring with stable performance is pre-pressed between the spring sleeve and the disc on the push rod, the spring is clamped to keep a rebound state, the injection pen is stored with energy, and when the physical parameters of the truncated cone spiral spring are changed, different injection speeds can be realized, so that the requirements of different medicines on different injection times are met.

2. The utility model discloses in, owing to adopted in the round hole that push rod top bayonet socket is in the lock dish centre bore, when the lock dish rotated and made the centre bore go up the card hole and aim at push rod top bayonet socket, push rod bayonet socket resistance disappeared, the push rod center pin was released along with the spring promptly and toward the motion of syringe direction, realized thrust. The locking structure adopts circular motion to realize locking and unlocking, and the state is stable and reliable, so that the force storage device is ensured not to be triggered by mistake when being impacted by unexpected force to the maximum extent. Similarly, the needle withdrawing mechanism of the utility model adopts the disc lock catch structure, so that the structure is stable, and the safe needle withdrawing is realized only after the injection is finished.

3. The utility model discloses in, owing to adopted the truncated cone coil spring, realized that the spring is shared space minimum after being compressed, the spring is because tower column structure moreover, axial stability is high in its working process to when being aroused, when promoting the push rod motion and realizing the injection, the power that releases in the twinkling of an eye is the biggest, then gets into the steady release of linearity. The characteristic is suitable for the injection of emergency drugs, especially in emergency treatment.

Drawings

FIG. 1 is an exploded view of a disposable automatic injection pen with an automatic needle withdrawing function of the present invention;

FIG. 2 is a double-insurance explosion diagram of the button, the pen holder and the thrust spring lock disc of the disposable automatic injection pen with the automatic needle withdrawing function of the utility model;

FIG. 3 is an exploded view of a force storing mechanism formed by the components such as the thrust spring of the disposable automatic injection pen with the automatic needle withdrawing function of the present invention;

fig. 4 is an exploded view of the needle withdrawing mechanism of the disposable automatic injection pen with the automatic needle withdrawing function of the present invention.

In the figure: 1. a button; 101. a thrust excitation rod end; 2. a push rod; 3. a thrust spring lock collar; 4. a spring housing; 5. a thrust spring; 6. a needle withdrawing spring lock disc; 7. PFS is put on shelf; 8. PFS is off-shelf; 9. a needle withdrawing spring; 10. a pen holder; 11. prefilled syringe with needle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, a disposable automatic injection pen with automatic needle withdrawing function comprises a safety structure composed of a button 1, a pen holder 10 and a thrust spring lock disc 3, wherein an L-shaped groove on the side surface of the button 1 is buckled with a phi 2x1mm at the upper end of the pen holder 10, and a double safety structure composed of a thrust excitation rod end 101 at the lower end of the button 1 and the thrust spring lock disc 3 is arranged as shown in fig. 2, the structure ensures that a thrust spring 5 and a locking mechanism thereof cannot be excited to work by mistake before the button 1 is rotated by 30 degrees towards an opening direction, the thrust structure composed of a push rod 2, a spring sleeve 4 and the thrust spring 5 is adopted, the thrust spring 5 is a truncated cone helical spring as shown in fig. 3, a pagoda-shaped structure thereof ensures that the releasing force is stable and reliable, and the space is small after the compression thereof, which is beneficial to shortening the length dimension of the pen without influencing the function stability, the injection pen is particularly suitable for anesthetic injection application in emergency medicine and emergency situations due to the characteristic that the initial force of the spring is in nonlinear rapid increase in the process of releasing the force when the spring coil is pressed and combined on a plane, the needle withdrawing mechanism consisting of the needle withdrawing spring lock disc 6, the PFS upper frame 7, the PFS lower frame 8 and the needle withdrawing spring 9 is as shown in figure 4, in the injection process of the injection pen, the push rod 2 is pushed downwards, when the injection is nearly finished, the push rod arranged on the side surface of the push rod 2 pushes the needle withdrawing spring lock disc 6, the hook on the PFS lower frame 8 is separated from the pushing needle withdrawing spring lock disc 6, so that the needle withdrawing spring 9 is excited to start to work, the spring sleeve 4 and the PFS upper frame 7 connected with the spring sleeve are pushed to move in the reverse injection direction together, the needle-carrying pre-encapsulation syringe 11 is withdrawn, and the needle head is withdrawn to the position of about 5 mm inside the pen holder, the push button 1 is buckled with phi 2x1mm at the upper end of a penholder 10, a thrust excitation rod end 101 forms double insurance for a thrust

spring lock disc

3, 3 bayonets at the upper end of the push rod 2, the thrust spring lock disc 3, a spring sleeve 4 and a thrust spring 5 form a force storage mechanism, only when the thrust spring lock disc 3 is subjected to a circumferential force formed by thrust from the push button 1, the force storage mechanism rotates until a bayonet hole on the disc is in the same line with the bayonet on the push rod 2, the thrust spring 5 is excited to rebound to form injection thrust, a needle withdrawing mechanism consisting of the needle withdrawing spring lock disc 6, a PFS upper frame 7, a PFS lower frame 8 and a needle withdrawing spring 9 is formed, under the action of a push rod arranged on the side surface of the push rod 2, the needle withdrawing spring lock disc 6 rotates to enable a hook of the PFS lower frame 8 to be separated from the needle withdrawing spring lock disc 6, so that the needle withdrawing spring 9 fixed on the PFS lower frame 8 is excited to push the spring sleeve, thereby driving the needle to withdraw to about 5 mm inside the barrel 10.

The working principle is as follows: firstly, a thrust spring 5 is sleeved at the upper end of a push rod 2, the thrust spring 5 and the thrust spring are plugged into a spring sleeve 4 to enable a round hole at the top of the spring sleeve 4, a thrust spring lock disc 3 is sleeved at the top of the push rod 2 and then rotates to enable the bayonet positions of the disc and a rod to be staggered, a pre-encapsulation injector 11 with a needle is inserted into a corresponding position of a PFS upper frame 7 and fixed, a needle withdrawing spring 9 is sleeved outside a PFS lower frame 8, a long hook of the long hook is inserted to the bottom along a long groove at the side of the PFS upper frame 7 until the long hook is fastened with a needle withdrawing spring lock disc 6, the whole body is inserted into the lower end of the push rod 2 and pushed into the lower end of the spring sleeve 4 along the opening end of the lower part of the spring sleeve 4 until bayonets at two sides of the PFS upper frame 7 are matched and fixed with a clamping hole at the lower part of the spring sleeve 4, finally the whole assembly is inserted into a.

When the push button is used, firstly, the push button 1 is rotated by 30 degrees, the bayonet sockets on the push button 1 and the pen holder 10 are rotated into the axial direction from circumferential displacement, the push force excitation rod end 101 is rotated to the hole from the end surface which is originally propped against the push spring lock disc 3, when the push button 1 is pressed, the 45-degree inclined plane of the push rod at the lower end of the push button pushes the push spring lock disc 3 to rotate until the central hole of the disc is clamped to be coaxial with the bayonet socket at the top end of the push rod 2, at the moment, the push rod 2 moves downwards under the spring force, the push spring 5 is excited, and; when the push rod 2 pushes the piston in the needle-containing pre-encapsulation syringe 11 to the position of less than about 3mm from the bottom, the side short push rod at the lower end of the push rod is already positioned on the end face of the needle withdrawing spring lock disc 6 and continues to move forward along with the push rod 2, the 45-degree inclined plane on the side face of the push rod starts to push the needle withdrawing spring lock disc 6 to rotate along the circumference until the long hook of the PFS lower frame 8 is disengaged from the long hook, at the moment, under the action of the needle withdrawing spring 9, the spring sleeve 4 drives the PFS upper frame 7, the needle-containing pre-encapsulation syringe 11 and the like to withdraw 10mm towards the top of the pen holder 10, needle pushing is realized, and at.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a take disposable automatic injection pen of automatic needle function that moves back, includes button (1) and pen-holder (10), its characterized in that: the pen holder is characterized in that a button (1) is arranged inside the pen holder (10), a circular arc-shaped thrust excitation rod end (101) is installed on the button (1), a thrust spring lock disc (3) is arranged below the thrust excitation rod end (101), a push rod (2) is arranged in the middle of the thrust spring lock disc (3), a thrust spring (5) is installed on the push rod (2), a spring sleeve (4) is arranged below the thrust spring lock disc (3), the thrust spring (5) is surrounded by the spring sleeve (4), the thrust spring (5) is a truncated cone helical spring, a needle withdrawing spring lock disc (6) is arranged below the push rod carried on the side surface of the push rod (2), a PFS upper frame (7) is arranged below the needle withdrawing spring lock disc (6), the PFS upper frame (7) is connected with the spring sleeve (4), and the PFS upper frame (7) is connected with a PFS lower frame (8) through a hook, the needle withdrawing spring (9) is installed on the PFS lower frame (8), and the needle-containing pre-encapsulation syringe (11) is arranged in the middle of the PFS lower frame (8).

2. The disposable automatic injection pen with the automatic needle withdrawing function according to claim 1, characterized in that: the thrust spring lock disc (3) is buckled with a thrust excitation rod end (101), an L-shaped groove on the side surface of the button (1) and a phi 2x1mm at the upper end of the penholder (10) to form a double safety structure.

3. The disposable automatic injection pen with the automatic needle withdrawing function according to claim 1, characterized in that: the push rod (2), the thrust spring lock disc (3) and the spring sleeve (4) form a spring pre-tightening and locking structure.

4. The disposable automatic injection pen with the automatic needle withdrawing function according to claim 1, characterized in that: the needle withdrawing spring lock disc (6) and the PFS upper frame (7) form a locking structure.

5. The disposable automatic injection pen with the automatic needle withdrawing function according to claim 1, characterized in that: and a spring pre-tightening structure consisting of two arc-shaped long clamping hooks is arranged between the PFS upper frame (7) and the PFS lower frame (8).

6. The disposable automatic injection pen with the automatic needle withdrawing function according to claim 1, characterized in that: the push rod (2) is of an arc-shaped push rod structure, the top end of the arc-shaped push rod structure is provided with three hooks, and the middle of the arc-shaped push rod structure is provided with an excitation spring.