CN212016369U - Automatic injector - Google Patents

Abstract

The utility model provides an automatic injector, which is characterized by comprising a propelling component, a starting component, a triggering component and a shell; the propelling component is positioned in the starting component, the propelling component comprises a propelling part and a limiting part, the propelling part is clamped with the limiting part to realize limiting, and the starting component ensures the braking of the propelling component before injection by fixing the limiting form of the propelling component; the trigger assembly accommodates the pre-filled syringe and pushes the actuation assembly out of the braking position after the injection begins; the housing encloses the entire syringe.

Description

Automatic injector

Technical Field

The utility model relates to the field of medical equipment, in particular to disposable automatic injection equipment.

Background

The existing disposable automatic injector has very complex design principle, leads to a plurality of parts which are generally more than 15, so the reliability is not high, the assembly difficulty is large, and the final product cost is too high.

CN110237366A discloses a medical injection device, which comprises an outer barrel and a pen cap, one end of the outer barrel is provided with a detachable medicine bin, a replaceable standard card type medicine bottle is arranged in the medicine bin, one end of the inner part of the outer barrel close to the medicine bin is provided with a fixed sleeve, the inner axial movement of the fixed sleeve is provided with a push rod seat, the inner part of the push rod seat is provided with a transmission ring which can be meshed with the end part of a transmission rod, the outer side of the transmission rod is sleeved with a ratchet ring which can axially slide, one end face of the ratchet ring is in one-way meshing with the inner part of the outer barrel, the other end of the ratchet ring is axially provided with a first spring, one end of the push rod seat is axially provided with a push rod seat spring which is propped against the outer barrel.

CN109999272A discloses a disposable adjustable injection device for insulin injection, which comprises a protective cover, a disposable needle, a pen core sleeve, a main body shell, a pen core and an adjusting component, one end of the main body shell is provided with a second boss, the outside of the second boss is provided with a refill sleeve, one end of the pencil lead sleeve is provided with a thread groove, the external thread of the second boss is in threaded connection with the thread groove, the other end of the refill sleeve is provided with a first boss, the outside of the first boss is connected with a disposable needle head through threads, a steel needle is inserted in the disposable needle head, a pen core is arranged in the pen core sleeve, a protective cover is sleeved outside the pen core sleeve, the other end of main body cover is provided with adjusting part, main body cover's internally mounted has fixed sleeve, fixed sleeve's one end outside protrusion has flange portion.

CN102264417A discloses an injection device comprising: a long housing; a container carrier having a medicament container to which a needle is mounted; a puncture device comprising a separation sleeve, a preloaded puncture spring device and a puncture holding device, wherein said preloaded puncture spring device is capable of acting on said separation sleeve and thereby on said container carrier for a sliding movement of said container and needle, and said puncture holding device is capable of holding said puncture spring device in a loaded state; injection means comprising a plunger rod, pre-loaded injection spring means and injection retaining means, wherein the plunger rod is arranged to act on a stopper in the medicament container, the pre-loaded injection spring means is adapted to act on the plunger rod such that the stopper is displaced within the container, and the injection retaining means is adapted to retain the injection spring means in a loaded state; retraction means comprising a preloaded retraction spring and retraction holding means, wherein the preloaded retraction spring is arranged to act on the separation sleeve and thereby on the container carrier, and the retraction holding means is capable of holding the retraction spring in a loaded state; a puncture sequence initiating means capable of acting on a puncture trigger means arranged on said separation cannula for disconnecting said puncture holding means; an injection trigger means provided on said separation sleeve and capable of disconnecting said injection holding means to initiate an injection sequence when the separation sleeve and the plunger rod are moved to a specific position; and retraction triggering means arranged on said separation sleeve and capable of disconnecting said retraction holding means for initiating needle retraction when said plunger rod has been moved to a certain position; characterized in that the device further comprises damping means comprising a compartment containing a volume of a highly viscous liquid and being partly defined by the outer surface of the plunger rod and the inner surface of the cap, wherein the compartment is arranged with a channel through which the liquid is forced only upon initiation of the injection sequence, such that the volume within the compartment decreases with movement of the plunger rod in the container during the entire injection sequence and thereby damping shear forces are generated.

Disclosure of Invention

The utility model aims to solve the technical problem that the prior art is not enough to overcome, a simple structure is provided, and spare part quantity is showing and is reducing, and the disposable automatic injector that each injection step reliability is high and use the injection method of this syringe.

In order to realize above purpose, the utility model provides a:

an autoinjector comprising a propulsion assembly, an activation assembly, a trigger assembly and a housing; the propelling component is positioned in the starting component, the propelling component comprises a propelling part and a limiting part, the propelling part is clamped with the limiting part to realize limiting, and the starting component ensures the braking of the propelling component before injection by fixing the limiting form of the propelling component; the trigger assembly accommodates the pre-filled syringe and pushes the actuation assembly out of the braking position after the injection begins; the shell is covered outside the propelling component, the starting component and the triggering component;

preferably, the propelling part of the propelling assembly comprises a main spring sleeve and a main spring, the limiting part of the propelling part comprises a main shaft, and the starting assembly comprises a starting sliding sleeve and an auxiliary spring;

the spindle body of the spindle is hollow, one end of the spindle body is closed and is provided with a first flange, a plurality of first bumps and second bumps with elasticity are respectively arranged on the spindle body from near to far away from the first flange, the first bumps protrude towards the outer surface direction of the spindle body, the first bumps are provided with axial guide slopes towards the first flange direction, the second bumps protrude towards the inner surface direction of the spindle body, and the second bumps are provided with axial guide slopes towards the first flange direction;

the main spring sleeve is positioned in the spindle shaft body, one end of the main spring sleeve is closed, the other end of the main spring sleeve is open, the closed end can be inserted into the pre-filled syringe, a clamping groove matched with the second bump is formed in the sleeve body of the main spring sleeve, one end of the pre-tightened main spring abuts against the closed end of the main spring sleeve, the other end of the pre-tightened main spring abuts against the closed end of the spindle, and the second bump is clamped into the clamping groove;

the starting sliding sleeve is sleeved outside the main shaft, the far end of the starting sliding sleeve is provided with a second flange, the inner surface of the sliding sleeve is axially provided with a groove capable of accommodating the first lug to slide in the groove, one end of the groove is open, the other end of the groove is closed, the opening is positioned at the flange end of the sliding sleeve, in an assembly state, the first lug and the second lug are completely positioned in the starting sliding sleeve, an auxiliary spring is arranged between the first flange and the second flange, and the first lug is clamped at the closed end of the groove;

after the clamping groove of the main spring sleeve is clamped with the second convex block of the main shaft body, the sleeve body of the starting sliding sleeve tightly presses the second convex block, so that the second convex block of the main shaft body and the clamping groove of the main spring sleeve are clamped, and the starting assembly is reliably fixed in a locking state.

Preferably, the trigger assembly comprises a syringe slide;

the syringe sliding sleeve can enable the pre-filled syringe to freely slide in the sleeve, a plurality of through grooves are formed in the sleeve body, one end of the syringe sliding sleeve props against the starting sliding sleeve, and the length of the other end of the syringe sliding sleeve exceeds the length of a needle head of the pre-filled syringe;

preferably, the housing is sleeved outside the automatic injector, one end of the housing is fixed on the first flange, the other end of the housing is shorter than the needle head of the pre-filled syringe, and a plurality of clamping blocks are arranged inside the housing and can clamp the flange of the pre-filled syringe through the through groove of the syringe sliding sleeve, so that the pre-filled syringe cannot move towards the injection direction. The length of the other end of the shell, which is shorter than the needle head, determines the puncture depth;

preferably, the part of the shaft body wall where the first and second bumps are located is hollowed out to form an elastic strip;

preferably, when the elastic strips of the first and second protrusions are positioned on a straight line, the width of the strip of the second protrusion is greater than that of the groove in the starting sliding sleeve, so that the strip of the second protrusion cannot be wholly positioned in the space of the groove, and the inner wall of the starting sliding sleeve can be ensured to tightly press the second protrusion;

preferably, the closed end of the main spring housing is provided with a hole, so that air between the main spring housing and the piston of the pre-filled syringe can be discharged in time, and the main spring housing is in quick and unobstructed contact with the piston after the injection is started;

preferably, the housing and the first flange are fixed by snapping;

preferably, the shaft body of the main shaft is further provided with a plurality of third elastic lugs protruding towards the outer surface of the shaft body, and the distance from the first flange is greater than the distance from the first lug to the second lug. The third bump is used for facilitating assembly, and temporarily fixing the starting sliding sleeve and the auxiliary spring on the main shaft before the main spring sleeve and the main spring are assembled on the main shaft;

preferably, one end of the syringe sliding sleeve, which is propped against the starting sliding sleeve, is provided with an inward convex barb.

Preferably, a pre-filled syringe is included.

The utility model simultaneously provides a method for utilize above-mentioned syringe to carry out injection, its characterized in that, concrete step is:

the method comprises the following steps: the starting stage, the needle cylinder sliding sleeve end of the injector is placed on the skin to be injected and pressed downwards;

step two: in the puncture stage, the syringe sliding sleeve 31 pushes the starting sliding sleeve 21 to move upwards relative to the needle until the needle contacts the skin, pressure is continuously applied, the needle starts to puncture into the skin, the needle sliding sleeve pushes the starting sliding sleeve to move upwards until the needle sliding sleeve completely enters the shell, and at the moment, the preset subcutaneous puncture depth is reached, and the puncture is finished; in the puncture process, the lower end of the starting sliding sleeve moves to the position above the second bump, the locking state of the second bump and the clamping groove is released, under the thrust action of the main spring, the clamping groove of the main spring sleeve slides along the axial guide slope of the second bump, the second bump elastically deforms outwards until the clamping groove completely leaves the clamping position of the second bump, the main spring pushes the main spring sleeve to continue to move forwards, and the front part of the main spring sleeve contacts and supports against the piston of the prefilled syringe;

step three: in the injection stage, the pre-filled syringe and the shell are fixedly clamped, the main spring continues to push the main spring sleeve and the piston, and the medicine in the pre-filled syringe is injected to the subcutaneous part of the patient until the piston reaches the bottommost end of the syringe, and the injection is finished;

step four: and in the resetting stage, the automatic injector is moved away, the auxiliary spring pushes the needle head sliding sleeve and the starting sliding sleeve to return, when the upper end of the starting sliding sleeve contacts the first bump, the upper end of the starting sliding sleeve slides along the axial guide slope surface of the first bump, the first bump elastically deforms inwards and then is separated from the starting sliding sleeve until the barb of the syringe sliding sleeve blocks the flange of the pre-filled syringe, and the injection procedure is finished. At the moment, the first bump is already separated from the starting sliding sleeve and is sealed in the shell, and the first bump cannot reversely enter the starting sliding sleeve again because of no guiding slope surface, so that the whole injection process is blocked if an injector repeats the step I, and the reuse of the automatic injector is avoided.

The utility model discloses for prior art have following beneficial effect:

1. the injector is designed into a propelling component, a starting component, a triggering component and a shell, and all the components are mutually matched, so that the whole injector is simple in structure, and the number of parts is greatly reduced;

2. the propelling component is clamped with the limiting component to realize limiting, and the starting component ensures the braking of the propelling component before injection by fixing the limiting form of the propelling component, so that the reliable braking of the starting component before injection is realized;

3. the first bump is designed to have a unidirectional guide slope surface, and can effectively avoid the repeated use of the automatic injector after being matched with the starting sliding sleeve;

4. the second bump is designed to have a unidirectional guide slope, and the braking and propelling state switching of the propelling component can be simply and skillfully realized after the second bump is matched with the starting sliding sleeve.

Drawings

The technical solution and the advantages of the present invention will be made apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1: the utility model discloses an explosion diagram of each component of the injector;

FIG. 2: the utility model is a sectional view of the internal structure of the injector in an assembled state;

FIG. 3: the utility model discloses a side view of the main shaft of the injector;

FIG. 4: the side view of the main spring sleeve of the injector of the utility model;

FIG. 5: the utility model discloses a side view of the injector starting sliding sleeve;

FIG. 6: the utility model is a side view of the sliding sleeve of the syringe cylinder;

FIG. 7: the utility model discloses a pre-fixed state diagram of the assembly of an injector propulsion component and a starting component;

FIG. 8: the final state diagram of the assembly of the injector propulsion component and the starting component of the utility model is shown;

FIG. 9: the utility model is a sectional view of the internal structure of the injector in an assembled state;

FIGS. 10 to 14: the utility model discloses a syringe injection process picture.

The parts in the figure are numbered as follows:

11-spindle, 12-main spring housing, 13-main spring, 14-first flange, 15-first bump, 16-second bump, 17-card slot, 18-third bump, 21-start slide, 22-auxiliary spring, 23-second flange, 24-groove, 31-syringe slide, 32-through slot, 33-barb, 4-housing, 41-card block, 51-prefilled syringe, 52-piston, 53-needle shield, 54-cap, 55-prefilled flange syringe.

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 in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1-6, an autoinjector comprises a main shaft 11, a main spring housing 12, a main spring 13, a start slide 21, an auxiliary spring 22, a syringe slide 31, a housing 4 and a prefilled syringe 51;

the spindle body of the spindle 11 is hollow, one end of the spindle body is closed and is provided with a first flange 14, a plurality of first bumps 15 and second bumps 16 with elasticity are respectively arranged on the spindle body 11 from near to far away from the first flange 14, the first bumps 15 protrude towards the outer surface direction of the spindle body, axial guide slope surfaces are arranged towards the first flange 14 direction, the second bumps 16 protrude towards the inner surface direction of the spindle body, and axial guide slope surfaces are arranged towards the first flange 14 direction;

in an assembly state, the main spring sleeve 12 is positioned in the shaft body of the main shaft 11, one end of the main spring sleeve 12 is closed, the other end of the main spring sleeve is open, the closed end can be inserted into the pre-filling syringe 51, a clamping groove 17 matched with the second bump is arranged on the sleeve body of the main spring sleeve 12, one end of the pre-tightened main spring 13 is propped against the closed end of the main spring sleeve 12, the other end of the pre-tightened main spring 13 is propped against the closed end of the main shaft 11, and the second;

the starting sliding sleeve 21 is sleeved outside the main shaft 11, the distal end of the starting sliding sleeve is provided with a second flange 23, the inner surface of the sliding sleeve is axially provided with a groove 24 capable of accommodating the first lug 15 to slide in the groove, one end of the groove 24 is open, the other end of the groove is closed, the opening is positioned at the end of the starting sliding sleeve 21 with the flange, the first lug 15 and the second lug 16 are completely positioned inside the starting sliding sleeve 21, an auxiliary spring 22 is arranged between the first flange 14 and the second flange, and the first lug 15 is clamped at the closed end of the groove;

after the clamping groove 17 of the main spring sleeve 12 is clamped with the second bump 16 of the shaft body of the main shaft 11, the sleeve body of the starting sliding sleeve 21 tightly presses the second bump 16, so that the second bump 16 of the shaft body of the main shaft 11 and the clamping groove of the main spring sleeve 12 are clamped, and the main spring sleeve 12 is reliably fixed in a locking state with the pretightening force of the main spring 13;

the syringe sliding sleeve 31 can enable the pre-filled syringe 51 to freely slide in the sleeve, a plurality of through grooves 32 are formed in the sleeve body, one end of the syringe sliding sleeve 31 props against the starting sliding sleeve 21, and the length of the other end exceeds the length of a needle of the pre-filled syringe 51, so that the pre-filled syringe 51 is integrally wrapped inside; one end of the syringe sliding sleeve 31, which is propped against the starting sliding sleeve 21, is provided with an inward convex barb; the pre-filled syringe 51 has a plunger 52 and preferably also a needle shield 53;

as shown in fig. 9, the housing 4 is disposed outside the automatic injector, and one end of the housing is fixed to the first flange 14, preferably in a snap-fit manner, and the other end of the housing is shorter than the needle of the pre-filled syringe 51, a plurality of locking blocks 41 are disposed inside the housing 4, the locking blocks 41 pass through the through slots 32 of the syringe sliding sleeve 31 to lock the flange of the pre-filled syringe 51, so that the pre-filled syringe 51 cannot move in the injection direction, and the length of the other end of the housing 4 shorter than the needle determines the puncture depth;

preferably, the auto-injector also has a protective cap 54, the cap 54 being pulled off during use, the needle sheath 53 being connected to the needle sheath 53 when present, the cap 54 being pulled off simultaneously with the needle sheath 53.

Example two

In this embodiment, as shown in fig. 3, the shaft body wall portion where the first and second protrusions 15, 16 are located is hollowed out to form a strip with elasticity, the first and second protrusions 15, 16 are located on the strip, when the elastic strips of the first and second protrusions 15, 16 are located on a straight line, the width of the strip of the second protrusion 16 is greater than the width of the groove 24 in the actuating sliding sleeve 21, so that the strip of the second protrusion 16 is not located in the space of the groove 24 as a whole, and it is ensured that the inner wall of the actuating sliding sleeve 21 can tightly press the second protrusion 16.

EXAMPLE III

In this embodiment, the closed end of the main spring housing 12 is vented to facilitate the timely venting of air between the main spring housing 12 and the plunger of the prefilled syringe 51, and the main spring housing 12 makes quick and unobstructed contact with the plunger 52 after the injection is initiated.

Example four

As shown in fig. 7-8, in this embodiment, the shaft body of the spindle 11 is further provided with a plurality of third elastic protrusions 18 protruding toward the outer surface of the shaft body, and the distance from the first flange 14 is greater than the distance from the first and second protrusions 15, 16. The third projection 18 serves to facilitate assembly, temporarily fixing the actuating slide 21 and the auxiliary spring 22 to the main shaft 11 before the main spring housing 12 and the main spring 13 are assembled to the main shaft 11.

EXAMPLE five

As shown in fig. 10-14, a method for injecting by using the injector comprises the following specific steps:

the method comprises the following steps: in the starting stage, as shown in fig. 10, the syringe sliding sleeve 31 end of the injector is placed on the skin to be injected and pressed down;

step two: in the puncturing stage, as shown in fig. 11, the syringe sliding sleeve 31 pushes the starting sliding sleeve 21 to move upward relative to the needle until the needle contacts the skin, pressure is continuously applied, the needle starts to puncture into the skin, the needle sliding sleeve 31 pushes the starting sliding sleeve 21 to move upward until the needle sliding sleeve 31 completely enters the housing 4, and at this time, a predetermined subcutaneous puncture depth is reached, and puncturing is finished; during the puncturing process, the lower end of the starting sliding sleeve 21 moves to the position above the second projection 16, the locking state of the second projection 16 and the locking groove 17 is released, under the thrust action of the main spring 13, the locking groove 17 of the main spring sleeve 12 slides along the axial guiding slope of the second projection 16, the second projection 16 elastically deforms outwards until the locking groove 17 is completely separated from the clamping position of the second projection 16, the main spring 13 pushes the main spring sleeve 12 to continue to move forwards, and the front part of the main spring sleeve 12 contacts and supports against the piston 52 of the prefilled syringe 51;

step three: an injection phase, as shown in fig. 12, in which the pre-filled syringe 51 and the housing 4 are fixed in a clamping manner, the main spring 13 continues to push the main spring housing 12 and the plunger 52, so as to inject the medicine in the pre-filled syringe 51 into the subcutaneous space of the patient, until the plunger 52 reaches the bottommost end of the pre-filled syringe 51, and the injection is finished;

step four: during the resetting stage, as shown in fig. 13-14, the automatic injector is removed, the auxiliary spring 22 pushes the needle sliding sleeve 31 and the actuating sliding sleeve 21 to retract, when the upper end of the actuating sliding sleeve 21 contacts the first projection 15, the upper end of the actuating sliding sleeve 21 slides along the axial guiding slope of the first projection 15, the first projection 15 is elastically deformed inward, and then is disengaged from the actuating sliding sleeve 21 until the barb 33 of the syringe sliding sleeve 31 catches the pre-filled syringe flange 55, and the injection procedure is ended. At this time, the first protrusion 15 has already come out of the starting sliding sleeve 21 and is enclosed in the housing 4, and because there is no guiding slope, the first protrusion 15 cannot enter the starting sliding sleeve 21 again in the reverse direction, if the injector repeats step one, the whole injection process will be blocked, thereby avoiding the reuse of the automatic injector.

The above is only the exemplary embodiment of the present invention, and not the limitation of the present invention, all the equivalent structures or equivalent processes of the present invention are used, or directly or indirectly applied to other related technical fields, and the same principle is included in the patent protection scope of the present invention.

Claims (11)

1. An autoinjector comprising a propulsion assembly, an activation assembly, a trigger assembly and a housing;

the propelling component is positioned in the starting component, the propelling component comprises a propelling part and a limiting part, the propelling part is clamped with the limiting part to realize limiting, and the starting component ensures the braking of the propelling component before injection by fixing the limiting form of the propelling component;

the trigger assembly accommodates the pre-filled syringe and pushes the actuation assembly out of the braking position after the injection begins;

the shell is wrapped outside the propelling component, the starting component and the triggering component.

2. The automatic injector of claim 1, wherein the propulsion component of the propulsion assembly comprises a main spring housing and a main spring, the limiting component of the propulsion component comprises a main shaft, and the activation assembly comprises an activation slide and an auxiliary spring;

the spindle body of the spindle is hollow, one end of the spindle body is closed and is provided with a first flange, a plurality of first bumps and second bumps with elasticity are respectively arranged on the spindle body from near to far away from the first flange, the first bumps protrude towards the outer surface direction of the spindle body, the first bumps are provided with axial guide slopes towards the first flange direction, the second bumps protrude towards the inner surface direction of the spindle body, and the second bumps are provided with axial guide slopes towards the first flange direction;

the main spring sleeve is positioned in the spindle shaft body, one end of the main spring sleeve is closed, the other end of the main spring sleeve is open, the closed end can be inserted into the pre-filled syringe, a clamping groove matched with the second bump is formed in the sleeve body of the main spring sleeve, one end of the pre-tightened main spring abuts against the closed end of the main spring sleeve, the other end of the pre-tightened main spring abuts against the closed end of the spindle, and the second bump is clamped into the clamping groove;

the starting sliding sleeve is sleeved outside the main shaft, a second flange is arranged at the far end of the starting sliding sleeve, a groove capable of accommodating the first lug to slide in the groove is axially formed in the inner surface of the sliding sleeve, one end of the groove is open, the other end of the groove is closed, the opening is located at the flange end of the sliding sleeve, the first lug and the second lug are completely located inside the starting sliding sleeve in an assembling state, an auxiliary spring is arranged between the first flange and the second flange, and the first lug is clamped at the closed end of the groove.

3. The autoinjector of any of claims 1-2, wherein the trigger assembly comprises a syringe slide;

the syringe sliding sleeve can enable the pre-filled syringe to freely slide in the sleeve, a plurality of grooves are formed in the sleeve body, one end of the syringe sliding sleeve props against the starting sliding sleeve, and the length of the other end of the syringe sliding sleeve exceeds the length of the needle head of the pre-filled syringe.

4. The automatic injector of any of claims 1-2, wherein said housing is fitted over the exterior of said automatic injector, and has one end fixed to said first flange and the other end shorter than the length of the needle of the pre-filled syringe, and a plurality of clips are provided inside said housing, said clips being adapted to engage said flange of the pre-filled syringe through slots in said syringe slide.

5. The automatic injector of claim 2, wherein the portion of the shaft wall where the first and second protrusions are located is hollowed out to form a flexible strip.

6. The automatic injector of claim 5, wherein when the resilient strips of the first and second projections are aligned, the width of the strip of the second projection is greater than the width of the groove in the activation sleeve.

7. The automatic injector of claim 2, wherein said closed end of said main spring housing is open.

8. The automatic injector of claim 4, wherein the housing and the first flange are secured by a snap fit.

9. The automatic injector of claim 2, wherein the shaft body of the main shaft further has a plurality of third resilient protrusions protruding toward the outer surface of the shaft body, and the third resilient protrusions are spaced from the first flange by a distance greater than the first and second protrusions.

10. The automatic injector of claim 3, wherein said barrel runner has an inwardly projecting barb at the end of said barrel runner that abuts against said actuating runner.

11. The automatic injector of any of claims 1-2, comprising a pre-filled syringe.

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