CN216708402U - Automatic injection pen and assembly jig assembly - Google Patents

Abstract

The embodiment of the application discloses automatic injection pen, assembly tool subassembly, this application embodiment includes: the pen comprises a pen body and a pen container, a push-injection piston, a locking buckle, a locking hook, a first spring and a second spring; in the assembling process, the locking buckle can move to the locking position from the unlocking position under the action of the first spring and stably stay at the locking position, the situation that the locking buckle automatically leaves the locking position to cause the piston buckle and the lock hook to break away from and cause assembly failure when the piston is injected in the assembly is prevented, and the assembly success rate is improved.

Description

Automatic injection pen and assembly jig assembly

Technical Field

The embodiment of the application relates to the field of medical equipment, in particular to an automatic injection pen and an assembly jig assembly.

Background

Automatic injection pens are widely used in the medical field. The automatic injection pen is simple to operate, and a patient can independently complete injection without the help of medical staff, and the automatic injection pen is mainly used for meeting the requirement that the patient independently completes medicine injection at home.

Existing automatic injection pens include: the pen comprises a pen body and a pen container, a pen body rear cover, a push-injection piston, a locking buckle, a locking hook and a time spring. The pen body pen container is internally provided with a push-injection piston, a locking buckle, a locking hook and a time spring, and the rear end of the pen body pen container is provided with a pen body rear cover. The lock hook is fixedly arranged at the rear end of the pen body pen container by the pen body rear cover, and after the installation is completed, the pen body rear cover, the lock hook and the pen body pen container are relatively static. When current automatic injection pen did not use when dispatching from the factory, the latch hook with inject the piston buckle block of piston one end to tightly the piston buckle in order to guarantee that the block is stable with the locking buckle cover, the time spring is the contraction state, and the piston is injected in the one end connection, and the arch of pen body pen container rear end inner wall is connected to the other end. When the existing automatic injection pen is triggered, the locking buckle moves towards the rear end of the pen body pen container relative to the locking hook, and the locking buckle leaves the piston buckle at one end of the injection piston. Under the pressure of the time spring on the pushing piston, the piston buckle at one end of the pushing piston is separated from the locking hook, and the pushing piston moves towards the front end of the pen body and the pen container.

When the existing automatic injection pen is assembled, the locking hook, the injection piston and the locking buckle are assembled to be in a stable clamping state outside the pen body pen container, then the locking hook, the injection piston and the locking buckle in the stable clamping state are pushed into the pen body pen container from the front end of the pen body pen container through the time spring, and finally the pen body rear cover is installed at the rear end of the pen body pen container. Because the locking buckle can freely move towards the rear end of the pen body and the pen container relative to the locking hook, the locking buckle is easy to leave the piston buckle at one end of the injection piston when the injection piston is assembled, the piston buckle at one end of the injection piston is separated from the locking hook, the assembly fails, and the assembly failure rate is high.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an automatic injection pen, an assembly jig assembly and an automatic injection pen assembly method, which are used for improving the assembly success rate of the automatic injection pen.

A first aspect of an embodiment of the present application provides an automatic injection pen, including: the pen comprises a pen body and a pen container, a push-injection piston, a locking buckle, a locking hook, a first spring and a second spring;

the push-injection piston, the locking buckle, the locking hook, the first spring and the second spring are arranged in the pen body pen container, the locking hook is fixedly arranged at the rear end of the pen body pen container, and the rear end of the first spring and the rear end of the second spring are fixed relative to the pen body pen container;

the rear end of the pushing piston is provided with a piston buckle, the piston buckle is matched with the lock hook, the locking buckle can move back and forth relative to the lock hook, the locking buckle moves forward relative to the lock hook to reach a locking position, the locking buckle moves backward relative to the lock hook to reach an unlocking position, the piston buckle and the lock hook can be tightly sleeved when the locking buckle is located at the locking position, and the piston buckle and the lock hook can be released when the locking buckle is located at the unlocking position;

the rear end of the locking buckle is connected with the front end of the first spring, the first spring is in a compressed state when the locking buckle is positioned at an unlocking position, and the first spring is in a compressed state or a natural state when the locking buckle is positioned at a locking position;

the rear end of the pushing piston is connected with the front end of the second spring, and the second spring is in a compressed state when the piston buckle is matched with the locking hook.

In a possible implementation manner of the first aspect of the embodiment of the present application, a spring positioning portion is disposed at a rear end of the locking buckle, and a front end of the first spring is matched with the spring positioning portion.

In a possible implementation manner of the first aspect of the embodiment of the present application, the spring positioning portion is a spring groove, and a front end of the first spring is installed in the spring groove.

In a possible implementation manner of the first aspect of the embodiment of the application, a locking groove is formed in the locking buckle, and the locking groove is matched with the piston buckle or the locking hook.

In a possible implementation manner of the first aspect of the embodiment of the present application, the automatic injection pen further includes a cartridge holder and a syringe;

the pen refill frame is fixedly arranged relative to the pen body and the pen container;

the needle cylinder is arranged in the refill frame;

the rear end of refill frame is provided with first buckle, and first buckle is inwards outstanding and is contacted with the rear end of cylinder, and first buckle is used for preventing the relative refill frame of cylinder from moving backward.

In a possible implementation manner of the first aspect of the embodiment of the present application, a first protrusion is disposed at a front end of the cartridge holder, the first protrusion protrudes inward to contact with a side wall of the front end of the syringe, and the first protrusion is configured to limit a radial movement of the syringe with respect to the cartridge holder.

In a possible implementation manner of the first aspect of the embodiment of the present application, the automatic injection pen further includes a cap, a needle cap, and a needle head;

the needle head is arranged at the front end of the needle cylinder;

the needle cap is sleeved on the needle head, and the rear end of the needle cap is matched with the front end of the needle cylinder;

the needle cap is sleeved by the cap, and the rear end of the cap is matched with the front end of the pen refill holder;

the rear end of the cap cover is provided with a second buckle which protrudes inwards to be contacted with the rear end of the needle cap;

the second buckle is used for enabling the needle cap to move forwards relative to the pen refill rack along with the cap under the action of the second buckle when the cap moves forwards relative to the pen refill rack, so that the needle cap is separated from the needle cylinder when the cap is separated from the pen refill rack.

In a possible implementation manner of the first aspect of the embodiment of the present application, the automatic injection pen further includes a needle guard;

the rear end of the needle guard sleeve is provided with a third buckle, the front end of the locking buckle is provided with a fourth buckle, and the third buckle is matched with the fourth buckle.

In one possible implementation manner of the first aspect of the embodiment of the present application, the automatic injection pen further includes a third spring;

the needle guard sleeve is matched with the pen refill holder;

a third spring is arranged between the needle protecting sleeve and the pen refill holder, and the needle protecting sleeve can move back and forth relative to the pen refill holder;

when the needle guard sleeve moves forwards to the limit position, the third spring is in a natural state or a compressed state;

when the needle guard sleeve moves backwards to the limit position, the third spring is in a compressed state;

in a possible implementation manner of the first aspect of the embodiment of the present application, the automatic injection pen further includes an explosion-proof sleeve;

the explosion-proof sleeve is arranged at the rear end of the needle cylinder.

In a possible implementation manner of the first aspect of the embodiment of the present application, the piston buckle is a female buckle, and the latch hook is provided with a male buckle; or,

the piston buckle is a male buckle, and the latch hook is provided with a female buckle.

In a possible implementation manner of the first aspect of the embodiment of the present application, the automatic injection pen further includes a window disposed on a side wall of the pen barrel of the pen body.

A second aspect of embodiments of the present application provides an assembly jig assembly for assembling the automatic injection pen of the first aspect, comprising: the first assembling jig comprises a push rod and a push cylinder;

the push rod can be sleeved into the push cylinder, and the push rod and the push cylinder can move relatively;

the push rod is used for pushing the locking buckle, and the push cylinder is used for pushing the push injection piston.

In a possible implementation of the second aspect of the embodiment of the present application, a first orientation portion is provided on a side wall of a rear end of the push cylinder, and the first orientation portion is matched with the push piston for preventing the push piston from rotating.

In a possible implementation manner of the second aspect of the embodiment of the present application, a second orientation portion is disposed on a side wall of the rear end of the push rod, and the second orientation portion is engaged with the locking buckle to prevent the locking buckle from rotating.

In a possible implementation manner of the second aspect of the embodiment of the application, the rear end of the push rod is provided with a blind hole, and the depth of the blind hole is greater than a first preset value, so that when the push rod pushes the locking buckle to the unlocking position, the push rod does not interfere with a piston rod of the push piston.

In a possible implementation manner of the second aspect of the embodiment of the application, the front end of the push rod is provided with a limiting block, and the limiting block is used for limiting the movement of the push cylinder, so that the push cylinder can be sleeved with the push cylinder from the rear end of the push rod until the push cylinder contacts the limiting block, and the movement of the push rod is stopped.

In a possible implementation manner of the second aspect of the embodiment of the present application, the assembling jig further includes: a second assembly jig;

the second assembling jig comprises a base and a convex part;

the bulge is arranged at the front end of the base; the length of the protruding portion in the front-rear direction is greater than a second preset value, so that the protruding portion can fix the locking buckle at the locking position.

A third aspect of the embodiments of the present application provides an automatic injection pen assembling method, which uses the assembling jig component of the second aspect to assemble the automatic injection pen of the first aspect, and includes:

fixedly installing a lock hook at the rear end of the pen container of the pen body;

placing a second spring at the rear end of the push injection piston;

placing a first spring at the rear end of the locking buckle;

placing the locking buckle at the rear end of the injection piston;

the push rod of the first assembling jig pushes the locking buckle to move towards the rear end of the pen body pen container until the push rod pushes the locking buckle to reach an unlocking position, and the first spring moves towards the rear end of the pen body pen container under the action of the pushing force of the locking buckle;

the push cylinder of the first assembling jig pushes the push-injection piston to move towards the rear end of the pen body pen container until the piston buckle is matched with the locking hook, and the second spring moves towards the rear end of the pen body pen container under the thrust action of the push-injection piston;

moving the push rod to the front end, moving the locking buckle to the front end under the action of the first spring until the locking buckle reaches a locking position, and tightly sleeving the piston buckle and the locking hook by the locking buckle;

after the locking buckle is tightly sleeved on the piston buckle and the locking hook, the push rod and the push cylinder are withdrawn from the front end of the pen container of the pen body.

In a possible implementation manner of the third aspect of the embodiment of the present application, before the pushing cylinder of the first assembling jig pushes the pushing piston to move towards the rear end of the pen barrel of the pen body, the method further includes:

and matching the first orientation part of the push cylinder with the push injection piston.

In a possible implementation manner of the third aspect of the embodiment of the present application, before the push rod of the first assembling jig pushes the locking buckle to move towards the rear end of the pen container of the pen body, the method further includes:

and matching the second orientation part of the push rod with the locking buckle.

In a possible implementation manner of the third aspect of the embodiment of the present application, before the pushing cylinder of the first assembling jig pushes the pushing piston to move towards the rear end of the pen container of the pen body, the method further includes:

the push cylinder is sleeved into the push rod until the front end of the push cylinder abuts against the limiting block of the push rod, so that the push cylinder and the push rod synchronously move towards the rear end of the pen container of the pen body.

In one possible implementation manner of the third aspect of the embodiment of the present application, placing the first spring at the rear end of the locking buckle includes:

the front end of the first spring is matched with the spring positioning part.

In a possible implementation manner of the third aspect of the embodiment of the present application, the fitting of the front end of the first spring and the spring positioning portion includes:

the front end of the first spring is mounted in the spring groove.

In a possible implementation manner of the third aspect of the embodiment of the present application, after the push rod and the push rod are withdrawn from the front end of the pen container, the method further includes:

inserting a second assembling jig from the rear end of the pen body pen container, enabling a protruding part of the second assembling jig to abut against the rear end of the locking buckle, and enabling the locking buckle to be static relative to the pen body pen container;

pushing the needle protecting sleeve into the pen body from the front end of the pen container until the needle protecting sleeve and the locking buckle are clamped mutually;

and pulling out the second assembling jig from the rear end of the pen body and the pen container.

In one possible implementation manner of the third aspect of the embodiment of the present application, before the needle guard sleeve is pushed into the pen barrel from the front end of the pen body, the method further includes:

installing the syringe in the refill holder;

matching the needle guard sleeve with the pen refill holder;

before the second assembling jig is pulled out of the rear end of the pen body and the pen container, the method further comprises the following steps:

and pushing the pen core frame into the pen body and the pen container from the front end of the pen body and the pen container until the pen core frame and the pen body and the pen container are clamped with each other.

In one possible implementation manner of the third aspect of the embodiment of the present application, before the installing the syringe in the cartridge holder, the method further includes:

the explosion-proof sleeve is arranged at the rear end of the needle cylinder.

According to the technical scheme, the embodiment of the application has the following advantages:

this application embodiment is provided with first spring for locking is detained and can be followed the unblock position and moved the locking position and stably stop in the locking position under the effect of first spring, prevents that the locking is detained and is led to piston buckle and latch hook to break away from and assemble the failure by automatic locking position of leaving when the piston is injected in the assembly, has improved the assembly success rate.

Drawings

FIG. 1 is an overall cross-sectional view of an automatic injection pen according to an embodiment of the present application;

FIG. 2 is another cross-sectional view of an automatic injection pen according to an embodiment of the present application;

FIG. 3 is a perspective view of a locking clasp of an automatic injection pen according to an embodiment of the present application;

FIG. 4 is another perspective view of a locking clasp of an automatic injection pen according to an embodiment of the present application;

FIG. 5 is a side view of a locking clasp for an automatic injection pen according to an embodiment of the present application;

FIG. 6 is a cross-sectional view A-A of a locking clasp of an automatic injection pen according to an embodiment of the present application;

FIG. 7 is a front view of a locking clasp of an automatic injection pen according to an embodiment of the present application;

FIG. 8 is a top view of a locking clasp for an automatic injection pen according to an embodiment of the present application;

fig. 9 is a perspective view of a cartridge holder of an automatic injection pen according to an embodiment of the present application;

FIG. 10 is a top view of a cartridge holder of an automatic injection pen according to an embodiment of the present application;

FIG. 11 is an assembled cross-sectional view of a cartridge holder and a pre-filled syringe of an automatic injection pen according to an embodiment of the present application;

FIG. 12 is a perspective view of a cap of an automatic injection pen according to an embodiment of the present application;

FIG. 13 is a cross-sectional view of a cap of an automatic injection pen according to an embodiment of the present application;

FIG. 14 is an exploded view of the assembly of an automatic injection pen and an assembly fixture according to an embodiment of the present application;

FIG. 15 is an exploded view of a first assembly jig and its assembly structure of an automatic injection pen and assembly jig assembly according to an embodiment of the present application;

FIG. 16 is a perspective view of a first assembly jig and its assembly structure of an automatic injection pen and assembly jig assembly according to an embodiment of the present application;

FIG. 17 is a cross-sectional view of a first assembly fixture and its assembly structure of an automatic injection pen and assembly fixture assembly according to an embodiment of the present application;

FIG. 18 is an exploded view of a second assembly jig and its assembly structure of an automatic injection pen and assembly jig assembly according to an embodiment of the present application;

FIG. 19 is a perspective view of a second assembly jig and its assembly structure of an automatic injection pen and assembly jig assembly according to an embodiment of the present application;

FIG. 20 is a sectional view of a second assembly jig and its assembly structure of an automatic injection pen and assembly jig assembly according to an embodiment of the present application;

fig. 21 is a front view of a first assembly jig of an assembly jig component according to an embodiment of the present application;

FIG. 22 is a front view of a second assembly jig of the embodiment of the present application;

FIG. 23 is a flow chart of a method of assembling an automatic injection pen according to an embodiment of the present application;

FIG. 24 is another flow chart of a method of assembling an automatic injection pen according to an embodiment of the present application;

1. a pen body and a pen container; 101. a first card hole; 102. a window; 2. a cap; 201. a second buckle; 3. a cartridge holder; 301. a first buckle; 302. a fifth buckle; 303. a first protrusion; 4. a needle guard sleeve; 401. a third buckle; 5. pushing a piston; 501. a piston buckle; 6. locking the buckle; 601. a fourth buckle; 602. a locking groove; 603. a spring slot; 7. a pen body rear cover; 8. a latch hook; 9. an explosion-proof sleeve; 10. a second spring; 11. a third spring; 12. a first spring; 13. pre-potting the syringe; 1301. a needle cylinder; 1302. a needle head; 1303. a needle cap; 14. a first assembling jig; 1401. a push rod; 1402. a push cylinder; 1403. a first orientation portion; 1404. blind holes; 15. a second assembly jig; 1501. a base; 1502. a raised portion.

Detailed Description

The embodiment of the application provides an automatic injection pen, an assembly jig assembly and an automatic injection pen assembly method, which are used for improving assembly power.

When the automatic injection pen is assembled, the automatic trigger device needs to be assembled into a locking state, so that the locking hook 8 and the piston buckle 501 need to be matched and tightly sleeved by the locking buckle 6. Because the locking buckle 6 can move back and forth relative to the locking hook 8, the locking buckle 6 has a locking position and an unlocking position, the locking hook 8 and the piston buckle 501 which are already matched at the locking position cannot be separated, and the locking hook 8 and the piston buckle 501 which are separated from each other cannot be matched; the latch hook 8 and the piston catch 501 which are separated from each other at the unlocking position can be matched under the action of external force, and the latch hook 8 and the piston catch 501 which are matched with each other can be separated under the action of external force.

Therefore, the assembly process is divided into three major steps, the first step, pushing the locking buckle 6 to the unlocking position; secondly, the locking buckle 6 is kept at an unlocking position, and the locking hook 8 is matched with the piston buckle 501 under the action of external force; and thirdly, keeping the locking hook 8 and the piston buckle 501 matched, and moving the locking buckle 6 from the unlocking position to the locking position.

As shown in fig. 1 to 20, an automatic injection pen according to an embodiment of the present application includes: the pen body comprises a pen body pen container 1, a push-injection piston 5, a locking buckle 6, a locking hook 8, a first spring 12 and a second spring 10.

The push-injection piston 5, the locking buckle 6, the locking hook 8, the first spring 12 and the second spring 10 are installed in the pen body pen container 1, the locking hook 8 is fixedly installed at the rear end of the pen body pen container 1, and the rear end of the first spring 12 and the rear end of the second spring 10 are fixed relative to the pen body pen container 1.

The rear end of the push piston 5 is provided with a piston buckle 501, the piston buckle 501 is matched with the lock hook 8, the locking buckle 6 can move back and forth relative to the lock hook 8, the locking buckle 6 moves forward relative to the lock hook 8 to reach a locking position, the locking buckle 6 moves backward relative to the lock hook 8 to reach an unlocking position, the piston buckle 501 and the lock hook 8 can be tightly sleeved when the locking buckle 6 is located at the locking position, and the piston buckle 501 and the lock hook 8 can be released when the locking buckle 6 is located at the unlocking position.

The rear end of the locking buckle 6 is connected with the front end of the first spring 12, when the locking buckle 6 is located at the unlocking position, the first spring 12 is in a compressed state, and when the locking buckle 6 is located at the locking position, the first spring 12 is in a compressed state or a natural state.

The back end of the pushing piston 5 is connected with the front end of the second spring 10, and the second spring 10 is in a compressed state when the piston buckle 501 is matched with the locking hook 8.

It should be noted that, the front-back direction of the embodiment of the present application is defined as follows, the direction from the locking hook 8 to the push plunger 5 is the front direction, and the direction from the push plunger 5 to the locking hook 8 is the back direction. The front-back direction may have other definitions, and the above definitions are used as examples in the embodiments of the present application.

The automatic injection pen in this embodiment has a matching structure in addition to the above-mentioned trigger structure, and the trigger structure and the matching structure are explained below:

firstly, the trigger structure is further explained.

(1) Spring location portion.

As shown in fig. 1 to 8, the rear end of the lock catch 6 is provided with a spring positioning portion, and the front end of the first spring 12 is engaged with the spring positioning portion. The spring positioning portion is a spring groove 603, and the front end of the first spring 12 is mounted in the spring groove 603. The outer diameter of the spring groove 603 is larger than the outer diameter of the first spring 12, and the inner diameter of the spring groove 603 is smaller than the inner diameter of the groove 603 of the first spring 12. The spring positioning portion may also be a protrusion or a snap that cooperates with the first spring 12, and is not limited in particular.

(2) A locking groove 602.

As shown in fig. 3 to 8, a locking groove 602 is provided inside the locking buckle 6, and the locking groove 602 is engaged with the piston catch 501 or the locking hook 8. The locking groove 602 extends in the front-rear direction, so that the locking catch 6 can move back and forth relative to the locking hook 8 and back and forth relative to the push piston 5. The piston buckle 501 is a female buckle, a male buckle is arranged on the latch hook 8, and the locking groove 602 is matched with the piston buckle 501 at the moment; alternatively, the piston latch 501 is a male latch, the latch hook 8 is provided with a female latch, and the locking groove 602 and the latch hook 8 are engaged at this time. The cooperation mode of the piston catch 501 and the latch hook 8 can also be a one-sided catch.

The width of the locking groove 602 is greater than the width of the piston catch 501 so that the piston catch 501 can fit into the locking groove 602. The inner diameter of the locking catch 6 at the locking groove 602 is larger than the outer diameter of the piston catch 501. In the process of matching the piston catch 501 with the latch hook 8, the piston catch 501 can be elastically deformed, and the maximum diameter reached by the piston catch 501 in the deformation process is called as the maximum outer diameter of the matching. The inner diameter of the locking catch 6 at the locking groove 602 is smaller than the mating maximum outer diameter of the piston catch 501. So that the piston catch 501 and the latch hook 8 cannot be separated after the latch catch 6 is sleeved on the piston catch 501 and the latch hook 8.

Secondly, a matched structure.

(1) A cartridge holder 3 and a barrel 1301.

As shown in fig. 1 to 2 and 9 to 11, the embodiment of the present application further includes a cartridge holder 3 and a needle cylinder 1301.

The outside of the pen core frame 3 is provided with two fifth buckles 302, the pen body pen container 1 is provided with two first clamping holes 101, and the fifth buckles 302 are matched with the first clamping holes 101, so that the pen core frame 3 is fixedly installed relative to the pen body pen container 1. The cartridge holder 3 may also be fixedly mounted on the pen body barrel 1 by other means, for example, a protrusion is provided in the pen body barrel 1 to limit the movement of the cartridge holder 3, which is not limited in particular.

A syringe 1301 is provided in the cartridge holder 3. The rear end of the cartridge holder 3 is provided with a first catch 301, the first catch 301 protrudes inward to contact with the rear end of the needle cylinder 1301, and the first catch 301 is used for preventing the needle cylinder 1301 from moving backward relative to the cartridge holder 3.

The front end of the cartridge holder 3 is provided with a first projection 303, the first projection 303 protrudes inward to contact the front end side wall of the cylinder 1301, and the first projection 303 serves to restrict the radial movement of the cylinder 1301 relative to the cartridge holder 3. The number of the first projections 303 is two or more.

An explosion-proof cover 9 is installed at the rear end of the cylinder 1301 to prevent the cylinder 1301 from being broken.

(2) Cap 2 and needle cap 1303.

As shown in fig. 1 to 2 and 12 to 13, the present embodiment further includes a cap 2, a needle cap 1303, and a needle 1302.

A needle 1302 is disposed at the forward end of barrel 1301. A needle cap 1303 covers the needle 1302, and the rear end of the needle cap 1303 is fitted to the front end of the barrel 1301. The barrel 1301, the needle cap 1303 and the needle 1302 together form the prefilled syringe 13, and prefilled liquid medicine is contained in the barrel 1301.

The rear end of cap 2 cooperates with the front end of refill frame 3, and cap 2 detachably cooperates with refill frame 3, and then detachably is connected with body of a pen barrel 1. The cap 2 can also be directly arranged on the pen body and the pen container 1.

The cap 2 covers the needle cap 1303, and a second catch 201 is provided at the rear end of the cap, and the second catch 201 protrudes inward to contact the rear end of the needle cap 1303.

The second buckle 201 is used for moving the needle cap 1303 forwards relative to the pen core frame 3 together with the cap 2 under the action of the second buckle 201 when the cap 2 moves forwards relative to the pen core frame 3, so that the needle cap 1303 is separated from the needle cylinder 1301 while the cap 2 is separated from the pen core frame 3. The second buckle 201 enables a user to pull down the syringe 1301 while pulling down the cap 2, thereby reducing user operations.

(3) A needle guard sleeve 4.

As shown in fig. 1 to 2 and 14, the present embodiment further includes a needle shield 4 and a third spring 11.

The needle guard sleeve 4 is matched with the pen refill holder 3. A third spring 11 is arranged between the needle guard sleeve 4 and the pen core frame 3, and the needle guard sleeve 4 can move back and forth relative to the pen core frame 3.

The rear end of the needle guard sleeve 4 is provided with a third buckle 401, the front end of the locking buckle 6 is provided with a fourth buckle 601, and the third buckle 401 is matched with the fourth buckle 601. After the needle guard 4 and the locking buckle 6 are engaged by the third buckle 401 and the fourth buckle 601, the needle guard 4 and the locking buckle 6 move synchronously. When not injecting, the locking buckle 6 is in the locking position; during injection, the skin of a user contacts the needle guard sleeve 4 and pushes the needle guard sleeve 4 backwards, and the needle guard sleeve 4 drives the locking buckle 6 to move backwards to reach an unlocking position. Rearward movement of the needle guard 4 causes the needle 1302 to emerge from within the needle guard 4 and penetrate the skin of the user.

When the needle guard sleeve 4 moves forwards to the limit position, the third spring 11 is in a natural state or a compressed state;

when the needle guard sleeve 4 moves backwards to the limit position, the third spring 11 is in a compressed state; the third spring 11 is used to keep the needle shield 4 in the extreme position of forward movement when not in use by the user.

It should be noted that the first spring 12 is also called an unlocking spring, the second spring 10 is also called a time spring, and the third spring 11 is also called a skin spring.

(4) The pen body and the pen container 1.

As shown in fig. 1 to 2 and 14, the embodiment of the present application further includes a pen body barrel 1.

The pen body and the pen container 1 are of tubular structures. The side wall of the pen body and the pen container 1 is provided with a window 102. The window 102 may be hollow or transparent. From the window 102, the movement of the bolus piston 5 or the change of the pre-potting drug solution can be observed, so that the user can know the progress of the injection. The rear end of the pen body and the pen container 1 is provided with a pen body rear cover 7.

The following description of the materials and parameters of the different springs for the automatic injection pen is given:

the pen body and the pen container 1 are made of PC; the material of the cap 2 is ABS; the refill holder 3 is made of POM; the material of the needle guard sleeve 4 is POM; the material of the push injection piston 5 is ABS; the locking buckle 6 is made of POM; the rear cover 7 of the pen body is made of ABS; the latch hook 8 is made of POM; the material of the explosion-proof sleeve 9 is TPR.

The material of the first spring 12 is SUS 304, and the relevant parameters are as follows: the diameter of the wire is 0.60, the outer diameter is 14, the length is 31.1, the total number of turns is 14, the number of effective turns is 10, the left-hand rotation is realized, and the compression amount is 13 mm.

The material of the second spring 10 is SUS 304, and the relevant parameters are as follows: the wire diameter is 1.00, the outer diameter is 19.5, the length is 85.4, the total number of turns is 12, the number of effective turns is 8, the left-hand rotation is realized, the maximum compression amount is 62mm, and the minimum compression amount is 22 mm.

The material of the third spring 11 is SUS 304, and the relevant parameters are as follows: the diameter of the wire is 0.70, the outer diameter is 12.8, the length is 33.4, the total number of turns is 9, the number of effective turns is 5, the left turn is realized, and the compression amount is 9 mm.

The above are examples only, and the material of the automatic injection pen and the parameters of the different springs may be adjusted according to actual needs.

As shown in fig. 14 to 22, an assembly jig assembly for assembling the automatic injection pen in the embodiment shown in fig. 1 to 20 includes: the first assembling jig 14, the first assembling jig 14 includes a push rod 1401 and a push cylinder 1402. The push rod 1401 can be sleeved into the push barrel 1402, and the push rod 1401 and the push barrel 1402 can move relatively. The push rod 1401 is used for pushing the locking buckle 6, and the push cylinder 1402 is used for pushing the push piston 5.

The assembly jig assembly of the embodiment of the present application may include a plurality of assembly jigs, which are described below respectively.

First, the first assembling jig 14 is further described.

The first assembling jig 14 may also have a structure for cooperating with a specific robot arm or a robot arm, such as a positioning portion, a fixing portion, and the like, which is not limited herein.

A first orientation part 1403 is arranged on the side wall of the rear end of the push cylinder 1402, and the first orientation part 1403 is matched with the push piston 5 to prevent the push piston 5 from rotating.

A second orientation portion may be further provided on a rear end side wall of the push rod 1401, and the second orientation portion is engaged with the locking buckle 6 to prevent the locking buckle 6 from rotating. The first orientation 1403 and the second orientation allow the installation angle of the locking catch 6 and the push plunger 5 to be determined, preventing misalignment. It should be noted that only one of the first orientation portion 1403 and the second orientation portion may be used, that is, the second orientation portion is only provided on the rear end side wall of the push rod 1401 or the first orientation portion 1403 is only provided on the rear end side wall of the push cylinder 1402, and this embodiment is described by taking the example where the first orientation portion 1403 is only provided on the rear end side wall of the push cylinder 1402 as an example.

The first orientation 1403 may be concave or convex; the second orientation may be a recess or a protrusion. The first orientation parts 1403 may be provided on both sides of the push cylinder 1402; the second orientation portions may be provided at both sides of the push rod 1401.

The rear end of the push rod 1401 is provided with a blind hole 1404, and the depth of the blind hole 1404 is larger than a first preset value, so that when the push rod 1401 pushes the locking buckle 6 to an unlocking position, the push rod 1401 and a piston rod of the pushing piston 5 do not interfere with each other.

The front end of the push rod 1401 is provided with a limiting block, and the limiting block is used for limiting the movement of the push cylinder 1402, so that the push cylinder 1402 can be sleeved in from the rear end of the push rod 1401 until the push cylinder 1402 contacts the limiting block, and the movement of the push rod 1401 is stopped. The stopper makes push rod 1401 and ejector 1402 move to the rear end in step, and then with locking knot 6 with inject piston 5 and promote to the rear end in step for when locking knot 6 reaches the unblock position, inject piston 5 and latch hook 8 cooperation.

Second, second assembling jig 15.

The embodiment of the application further comprises: and a second assembly jig 15. The second assembly jig 15 includes a base 1501 and a boss 1502.

The boss 1502 is provided at the front end of the base 1501; the length of the boss 1502 in the front-rear direction is larger than the second preset value, so that the boss 1502 can fix the locking buckle 6 in the locking position.

The second assembling jig 15 may also have a structure for cooperating with a specific robot arm or manipulator, such as a positioning portion, a fixing portion, and the like, and is not limited herein.

As shown in fig. 23, the present application provides an assembling method for an automatic injection pen, which assembles the automatic injection pen in the embodiment shown in fig. 1 to 20 by using the assembling jig assembly in the embodiment shown in fig. 14 to 22. The assembly method may be performed mechanically or manually.

2301. The locking hook 8 is fixedly arranged at the rear end of the pen body and pen container 1.

The locking hook 8 is installed into the pen body barrel 1 from the rear end of the pen body barrel 1 and is fixedly installed.

2302. A second spring 10 is placed at the rear end of the bolus piston 5.

The front end of the second spring 10 is in contact with the rear end of the bolus piston 5.

2303. The first spring 12 is placed at the rear end of the locking buckle 6.

The front end of the first spring 12 contacts the rear end of the locking buckle 6.

2304. The locking button 6 is placed at the rear end of the push piston 5.

Locking buckle 6 is located the rear of pushing injection piston 5 for after the assembly is accomplished, locking buckle 6 can push injection piston 5 backward movement relatively.

The timing sequence of the steps 2301, 2302, 2303 and 2304 is not related, and is not limited.

2305. The push rod 1401 pushes the locking buckle 6 to move towards the rear end of the pen body barrel 1.

The locking button 6 is operated towards the rear end until the push rod 1401 pushes the locking button 6 to the unlocking position, and the first spring 12 moves towards the rear end of the pen body barrel 1 under the pushing force of the locking button 6. When the locking buckle 6 reaches the unlocking position, the first spring 12 is in a compressed state, the rear end of the first spring 12 is connected with the stylus pen barrel 1, and the front end of the first spring 12 contacts the locking buckle 6.

2306. The push cylinder 1402 pushes the push piston 5 to move toward the rear end of the pen body barrel 1.

The piston buckle 501 moves towards the rear end until the piston buckle 501 is matched with the locking hook 8, and the second spring 10 moves towards the rear end of the pen body and pen container 1 under the thrust action of the pushing piston 5. When the pushing piston 5 is matched with the locking hook 8, the second spring 10 is in a compressed state, the rear end of the second spring 10 is connected with the stylus pen barrel 1, and the front end of the second spring 10 is contacted with the pushing piston 5.

Steps 2305 and 2306 may be performed sequentially or simultaneously, and are not limited specifically.

2307. The push rod 1401 is moved to the front end.

The push rod 1401 is moved forward so that the latch 6 is moved to the front end by the force of the first spring 12 until the latch 6 reaches the latching position so that the latch 6 grips the piston catch 501 and the latch hook 8.

2308. The push rod 1401 and the push cylinder 1402 are withdrawn from the front end of the pen body barrel 1.

After the locking buckle 6 tightly sleeves the piston buckle 501 and the locking hook 8, the push rod 1401 and the push cylinder 1402 are withdrawn from the front end of the pen body barrel 1. The push rod 1401 and the push cylinder 1402 may be withdrawn sequentially or simultaneously, and the present invention is not limited to this.

As shown in fig. 24, another method for assembling an automatic injection pen according to an embodiment of the present application includes:

2401. the latch hook 8 is installed.

The locking hook 8 is arranged in the pen body pen container 1 from the rear end of the pen body pen container 1 and is fixedly arranged.

2402. The push injection piston 5, the locking buckle 6, the first spring 12 and the second spring 10 are arranged.

A second spring 10 is placed at the rear end of the bolus piston 5. The front end of the second spring 10 is in contact with the rear end of the push plunger 5.

The first spring 12 is placed at the rear end of the locking buckle 6. The front end of the first spring 12 contacts the rear end of the locking buckle 6. The front end of the first spring 12 is fitted with the spring positioning portion, that is, the front end of the first spring 12 is fitted in the spring groove 603.

The locking button 6 is placed at the rear end of the push piston 5. Locking buckle 6 is located the rear of pushing injection piston 5 for after the assembly is accomplished, locking buckle 6 can push injection piston 5 backward movement relatively.

2403. The first assembling jig 14, the locking buckle 6 and the pushing piston 5 are arranged.

The push cylinder 1402 is sleeved into the push rod 1401 until the front end of the push cylinder 1402 abuts against a limit block of the push rod 1401, so that the push cylinder 1402 and the push rod 1401 synchronously move towards the rear end of the pen body barrel 1.

Fitting the first orientation portion 1403 of the push cylinder 1402 with the push plunger 5 makes the push plunger 5 unable to rotate relative to the push cylinder 1402, which determines the installation angle of the push plunger 5.

The second orientation portion of the push rod 1401 is matched with the locking buckle 6, so that the locking buckle 6 cannot rotate relative to the push rod 1401, and the installation angle of the locking buckle 6 is determined.

2404. Pushing the catch 6 to the unlocked position and engaging the piston catch 501 with the catch 8.

The push rod 1401 of the first assembling jig 14 pushes the locking buckle 6 to move towards the rear end of the pen body barrel 1. The locking button 6 is operated towards the rear end until the push rod 1401 pushes the locking button 6 to the unlocking position, and the first spring 12 moves towards the rear end of the pen body barrel 1 under the pushing force of the locking button 6. When the locking buckle 6 reaches the unlocking position, the first spring 12 is in a compressed state, the rear end of the first spring 12 is connected with the stylus pen barrel 1, and the front end of the first spring 12 contacts the locking buckle 6.

The pushing cylinder 1402 of the first assembling jig 14 pushes the pushing piston 5 to move toward the rear end of the pen body barrel 1. The piston buckle 501 moves towards the rear end until the piston buckle 501 is matched with the locking hook 8, and the second spring 10 moves towards the rear end of the pen body and pen container 1 under the thrust action of the pushing piston 5. When the pushing piston 5 is matched with the locking hook 8, the second spring 10 is in a compressed state, the rear end of the second spring 10 is connected with the stylus pen barrel 1, and the front end of the second spring 10 is contacted with the pushing piston 5.

2405. Pushing the locking catch 6 into the locking position.

The push rod 1401 is moved forward so that the latch 6 is moved to the front end by the force of the first spring 12 until the latch 6 reaches the latching position so that the latch 6 grips the piston catch 501 and the latch hook 8.

2406. The ram 1401 and the ram 1402 are withdrawn.

After the locking buckle 6 tightly sleeves the piston buckle 501 and the locking hook 8, the push rod 1401 and the push cylinder 1402 are withdrawn from the front end of the pen body barrel 1. The push rod 1401 and the push cylinder 1402 may be withdrawn sequentially or simultaneously, and the present invention is not limited to this.

2407. The locking buckle 6 is fixed.

The second assembling jig 15 is inserted from the rear end of the pen body barrel 1, so that the protrusion 1502 of the second assembling jig 15 abuts against the rear end of the locking buckle 6, and the locking buckle 6 is made to be static relative to the pen body barrel 1. A through hole is provided in the latch hook 8, so that the protrusion 1502 of the second assembly fixture 15 can pass through the latch hook 8 and abut against the latch catch 6.

2408. The needle guard 4 is fitted with the locking buckle 6.

The explosion-proof cover 9 is provided at the rear end of the cylinder 1301. The cartridge 1301 is installed in the cartridge holder 3. The needle guard 4 is matched with the pen refill holder 3.

The needle guard sleeve 4 and the pen holder 3 are pushed into the pen body pen container 1 from the front end until the needle guard sleeve 4 and the locking buckle 6 are clamped mutually and the pen holder 3 and the pen body pen container 1 are clamped mutually

2409. The second assembling jig 15 is withdrawn.

The second assembling jig 15 is pulled out from the rear end of the pen body barrel 1. The pen body rear cover 7 is arranged at the rear end of the pen body barrel 1. The cap 2 is arranged at the front end of the pen body and the pen container 1.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

Claims (18)

1. An automatic injection pen, comprising: the pen body comprises a pen body pen container (1), a push injection piston (5), a locking buckle (6), a locking hook (8), a first spring (12) and a second spring (10);

the push-injection piston (5), the locking buckle (6), the locking hook (8), the first spring (12) and the second spring (10) are mounted in the pen body pen container (1), the locking hook (8) is fixedly mounted at the rear end of the pen body pen container (1), and the rear ends of the first spring (12) and the second spring (10) are fixed relative to the pen body pen container (1);

a piston buckle (501) is arranged at the rear end of the pushing piston (5), the piston buckle (501) is matched with the lock hook (8), the locking buckle (6) can move back and forth relative to the lock hook (8), the locking buckle (6) moves forward relative to the lock hook (8) to reach a locking position, the locking buckle (6) moves backward relative to the lock hook (8) to reach an unlocking position, the piston buckle (501) and the lock hook (8) can be tightly sleeved when the locking buckle (6) is located at the locking position, and the piston buckle (501) and the lock hook (8) can be released when the locking buckle (6) is located at the unlocking position;

the rear end of the locking buckle (6) is connected with the front end of the first spring (12), the first spring (12) is in a compressed state when the locking buckle (6) is located at an unlocking position, and the first spring (12) is in a compressed state or a natural state when the locking buckle (6) is located at a locking position;

the rear end of the pushing piston (5) is connected with the front end of the second spring (10), and the second spring (10) is in a compressed state when the piston buckle (501) is matched with the locking hook (8).

2. The autoinjector pen according to claim 1, wherein a rear end of the latch (6) is provided with a spring locating portion with which a front end of the first spring (12) cooperates.

3. The automatic injection pen of claim 2, wherein the spring positioning portion is a spring groove (603), and a front end of the first spring (12) is mounted in the spring groove (603).

4. Auto-injection pen according to any of claims 1 to 3, characterized in that the locking catch (6) is provided with a locking groove (602) inside, the locking groove (602) cooperating with the piston catch (501) or the locking hook (8).

5. The automatic injection pen of any of claims 1 to 3, further comprising a cartridge holder (3) and a syringe (1301);

the pen core frame (3) is fixedly arranged relative to the pen body and the pen container (1);

the needle cylinder (1301) is arranged in the refill holder (3);

the rear end of the refill holder (3) is provided with a first buckle (301), the first buckle (301) protrudes inwards to be in contact with the rear end of the needle cylinder (1301), and the first buckle (301) is used for preventing the needle cylinder (1301) from moving backwards relative to the refill holder (3).

6. The automatic injection pen of claim 5, wherein the cartridge holder (3) is provided at a front end thereof with a first projection (303), the first projection (303) projecting inwardly to be in contact with a front end side wall of the cylinder (1301), the first projection (303) serving to restrict the cylinder (1301) from moving radially relative to the cartridge holder (3).

7. The automatic injection pen of claim 5, further comprising a cap (2), a needle cap (1303) and a needle (1302);

the needle (1302) is arranged at the front end of the needle cylinder (1301);

the needle cap (1303) sleeves the needle (1302), and the rear end of the needle cap (1303) is matched with the front end of the needle cylinder (1301);

the needle cap (1303) is sleeved by the cap (2), and the rear end of the cap (2) is matched with the front end of the refill frame (3);

the rear end of the cap is provided with a second buckle (201), and the second buckle (201) protrudes inwards to be in contact with the rear end of the needle cap (1303);

the second buckle (201) is used for enabling the needle cap (1303) to move forwards relative to the refill holder (3) together with the cap (2) under the action of the second buckle (201) when the cap (2) moves forwards relative to the refill holder (3), so that the needle cap (1303) is separated from the needle cylinder (1301) while the cap (2) is separated from the refill holder (3).

8. The automatic injection pen of claim 5, further comprising a needle guard (4);

the rear end of the needle guard sleeve (4) is provided with a third buckle (401), the front end of the locking buckle (6) is provided with a fourth buckle (601), and the third buckle (401) is matched with the fourth buckle (601).

9. The automatic injection pen of claim 8, further comprising a third spring (11);

the needle guard sleeve (4) is matched with the pencil lead frame (3);

the third spring (11) is arranged between the needle guard sleeve (4) and the pen core frame (3), and the needle guard sleeve (4) can move back and forth relative to the pen core frame (3);

when the needle guard sleeve (4) moves forwards to the limit position, the third spring (11) is in a natural state or a compressed state;

when the needle guard sleeve (4) moves backwards to the limit position, the third spring (11) is in a compressed state.

10. The automatic injection pen of claim 5, further comprising an explosion-proof sleeve (9);

the explosion-proof sleeve (9) is arranged at the rear end of the needle cylinder (1301).

11. The automatic injection pen of any of claims 1 to 3 or 6 to 10,

the piston buckle (501) is a female buckle, and a male buckle is arranged on the lock hook (8); or,

the piston buckle (501) is a male buckle, and a female buckle is arranged on the lock hook (8).

12. The automatic injection pen of any of claims 1 to 3 or 6 to 10, further comprising a window (102) provided in a side wall of the pen body barrel (1).

13. An assembly jig assembly for assembling an automatic injection pen according to any one of claims 1 to 11, comprising: the first assembling jig (14), wherein the first assembling jig (14) comprises a push rod (1401) and a push cylinder (1402);

the push rod (1401) can be sleeved in the push cylinder (1402), and the push rod (1401) and the push cylinder (1402) can move relatively;

the push rod (1401) is used for pushing the locking buckle (6), and the push cylinder (1402) is used for pushing the push injection piston (5).

14. The assembly jig assembly according to claim 13, characterized in that a first orientation portion (1403) is provided on a rear end side wall of the push cylinder (1402), and the first orientation portion (1403) is engaged with the push plunger (5) for preventing the push plunger (5) from rotating.

15. The assembly jig assembly according to claim 13 or 14, characterized in that a second orientation portion is provided on a rear end side wall of the push rod (1401), and the second orientation portion is engaged with the locking buckle (6) for preventing the locking buckle (6) from rotating.

16. The assembly jig assembly according to claim 13 or 14, characterized in that a blind hole (1404) is formed in the rear end of the push rod (1401), and the depth of the blind hole (1404) is larger than a first preset value, so that when the push rod (1401) pushes the locking buckle (6) to the unlocking position, the push rod (1401) and a piston rod of the pushing and injecting piston (5) do not interfere with each other.

17. The assembly jig assembly according to claim 13 or 14, characterized in that the front end of the push rod (1401) is provided with a limiting block for limiting the movement of the push cylinder (1402), so that the push cylinder (1402) can be inserted from the rear end of the push rod (1401) until the push cylinder (1402) contacts the limiting block, and the movement of the push rod (1401) is stopped.

18. The assembly jig assembly as claimed in claim 13 or 14, further comprising: a second assembly jig (15);

the second assembly jig (15) comprises a base (1501) and a boss (1502);

the boss (1502) is arranged at the front end of the base (1501); the length of the protruding part (1502) in the front and back direction is larger than a second preset value, so that the protruding part (1502) can fix the locking buckle (6) at the locking position.

Images