CN213609007U

CN213609007U - Injection device for double-cavity clamping type bottle

Info

Publication number: CN213609007U
Application number: CN202022060358.7U
Authority: CN
Inventors: 桑会庆; 吴亚金; 朱涛
Original assignee: Shanghai Umitai Medical Technology Co ltd
Current assignee: Shanghai Umitai Medical Technology Co ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-07-06
Anticipated expiration: 2030-09-18

Abstract

The utility model provides an injection device for a double-cavity clamping type bottle, which comprises a liquid mixing component, an injection component and a safety component, wherein the liquid mixing component comprises a refill bracket, a pen body, a screw rod push plug and a push screw rod; a cavity for mounting a double-cavity clamping type bottle is arranged in the refill bracket; the pen core support is in threaded connection with the pen body, a one-way elastic sheet is arranged on the pen core support, and an anti-reverse groove matched with the one-way elastic sheet is arranged in the pen body, wherein the pen core support can rotate in one direction in the anti-reverse groove; the screw rod push plug is arranged in the pen body and provided with a step groove, the end part of the push screw rod is provided with a first connecting boss in limit fit with the step groove, and the push screw rod can rotate in the step groove through the first connecting boss; the utility model provides a well freeze-dried powder medicine is adorned in advance inside injection device, and the patient can be with freeze-dried powder and water agent misce bene through simple operation, then carries out the accurate injection.

Description

Injection device for double-cavity clamping type bottle

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to two-chamber card formula injection device for bottle for freeze-dried powder injection medicine injection.

Background

Most of known injection devices are provided with water aqua medicines, but some medicines cannot be stored in a water aqua mode in life, the main reasons are that the medicines have heat sensitivity and are easy to degrade and the low cost of commercial production is considered, the general water aqua medicines need high-temperature sterilization, the quality of the medicines is reduced due to high temperature, the medicine components are always dissolved in the water aqua due to the fact that the medicines are prepared into the water aqua, and the effective components in the medicines are degraded to influence the injection effect of products. For some lyophilized powder medicines, such as auxin and the like, multiple times of small-dose accurate injection is also needed, the traditional method is that the aqueous solvent is injected into a lyophilized powder reagent bottle for mixing, and then the uniformly mixed lyophilized powder dissolving solution is injected through a disposable sterile injector, the disposable injector cannot carry out accurate injection, and the operation needs professional medical staff for operation, so that the operation is not beneficial to the self-operation of a patient needing long-term fixed-time quantitative administration in residence, and the burden of the medical staff is increased.

SUMMERY OF THE UTILITY MODEL

To prior art's defect, the utility model provides a two-chamber card formula injection device for bottle for injection of freeze-dried powder injection medicine, freeze-dried powder medicine pre-installation are inside injection device, and the patient can be with freeze-dried powder and water agent misce bene through simple operation, then carry out the accurate injection.

In order to achieve the purpose, the utility model provides an injection device for a double-cavity clamping type bottle, which comprises a liquid mixing component, an injection component and a safety component, wherein the liquid mixing component comprises a refill bracket, a pen body, a screw rod push plug and a push screw rod;

a cavity for mounting a double-cavity clamping type bottle is arranged in the refill bracket;

the pen core support is in threaded connection with the pen body, a one-way elastic sheet is arranged on the pen core support, and an anti-reverse groove matched with the one-way elastic sheet is arranged in the pen body, wherein the pen core support can rotate in one direction in the anti-reverse groove;

the screw rod push plug is arranged in the pen body and provided with a step groove, the end part of the push screw rod is provided with a first connecting boss in limit fit with the step groove, and the push screw rod can rotate in the step groove through the first connecting boss;

the pen comprises a pen body, a pen core support, a plurality of positioning grooves and an elastic bulge, wherein the pen body is internally provided with the plurality of positioning grooves used for limiting the position of a liquid mixing state, the elastic bulge is arranged on the pen core support, when the pen core support is rotated and screwed into the pen body, the elastic bulge sequentially passes through the plurality of positioning grooves, and when the elastic bulge is matched with the positioning grooves, the one-way elastic sheet is positioned in the anti-reverse groove.

The above technical scheme of the utility model, threaded connection is in the same place between refill support and the body, and under artificial external force adds holding, the refill support produces axial displacement at the body internal rotation, drives two-chamber card type bottle upward movement, and the axial distance of two-chamber card type bottle and screw rod plug shortens, and two-chamber card type bottle and inside medicine can get into the body together, and the inside screw rod plug of the body of writing is motionless this moment to promote the plug motion, thereby accomplish the operation of muddy liquid.

Specifically, in the operation of mixing liquid, the utility model discloses set up many places positioning groove and remind the user to mix liquid state position, show through the one-to-one cooperation between elastic bulge and the many places positioning groove, instruct the user to use, simultaneously, elastic bulge can send obvious "the sound of clicking" because the positioning groove is advanced to the bullet to more clear and definite user of telling.

According to the utility model discloses a another kind of embodiment is equipped with the demonstration sign with many places positioning groove one-to-ones on the refill support, be equipped with on the body of the pen be used for with show the sign cooperation instruct the reading window of mixing liquid state position.

According to the utility model discloses a another kind of embodiment, the inner chamber of refill support is equipped with the side boss matched with rectangle recess on the two-chamber card bottle, wherein is equipped with on the refill support to be used for restricting the gliding snak link from restoring to the throne of two-chamber card bottle axial, and the snak link sets up in the top side at the rectangle recess.

According to the utility model discloses a another kind of embodiment, refill support inner wall be equipped with the side boss complex guide inclined plane of two-chamber cassette bottle, the bottom on guide inclined plane is located the rectangle recess directly over.

According to another embodiment of the present invention, an injection device comprises a release button, an elastic element, a tail handle connecting cylinder, a sleeve, a connecting ring, and a rotary push rod;

the rotary push rod, the tail handle connecting cylinder and the sleeve are sequentially arranged from inside to outside in the radial direction, the release button is axially movably arranged at the top of the sleeve, and the elastic element is arranged between the tail handle connecting cylinder and the release button;

the inner wall of the tail handle connecting cylinder is provided with an axial groove, the outer wall of the connecting ring is provided with a second connecting boss, and the second connecting boss is positioned in the axial groove;

the connecting ring is arranged at the upper end of the rotating push rod through threaded connection, and the rotating push rod rotates when the connecting ring slides downwards along the axial groove.

According to the utility model discloses a another kind of embodiment, the go-between has the top dead center and the lower dead center of retraining its self rotation number of turns, rotates and is equipped with top dead center piece and lower dead center piece on the push rod, wherein top dead center and top dead center piece between the cooperation form go up the rotation dead center, end down the position and end down and form down between the dead center piece.

The spiral that go on the rotation push rod of go-between in this scheme rotates the number of turns and confirms and be the fixed value, based on the cooperation between a caudal peduncle even section of thick bamboo and the go-between, the two has synchronous pivoted ability, and the rotatory number of turns of a caudal peduncle even section of thick bamboo is unanimous with the go-between, and the number of turns of a caudal peduncle even section of thick bamboo is exactly the maximum position that the dose can set up to make the dose set up the operation can not set out the injection volume that is greater than the inside surplus medicament volume of two-chamber cassette bottle and come.

According to another embodiment of the utility model, go up the stop tab and be elastic construction to the installation of go-between. According to the utility model discloses a another kind of embodiment, safe subassembly includes orientation disc, safety lock, and orientation disc sets up in the body of a brush and the cover is established on rotating the push rod, but the safety lock axial displacement ground cover establish on rotating the push rod, and wherein orientation disc has the breach, and the safety lock is equipped with branch, wave spring, barb, and branch slides and sets up in the breach, and orientation disc's lower terminal surface and wave spring looks butt are equipped with the rotation with the first spacing boss of barb matched with in order to restrict rotating the push rod on the rotating the push rod.

According to the utility model discloses a another kind of embodiment, when refill support screw in matched with the positioning groove who is in the top to elastic bulge, the refill support can promote the safety lock and upwards slide and compress tightly wave spring, and the barb breaks away from with first spacing boss this moment.

According to the utility model discloses a another kind of embodiment, the periphery wall of positioning disk further is equipped with the spacing boss of second, and the safety lock is equipped with the tooth with the spacing boss matched with of second, and wherein the cooperation between the spacing boss of tooth and second, its effect is equal to being connected between breach and the branch, aims at restricting the relative rotation between safety lock and the positioning disk, makes the safety lock can slide relative positioning disk simultaneously.

Compared with the prior art, the utility model discloses possess following beneficial effect:

the utility model discloses earlier drive the same screw in of two-chamber card bottle in the body of a writing brush through rotatory refill support, make solvent and freeze-dried powder mixture in the two-chamber card bottle, then push the screw rod and feed forward under the effect of injection subassembly, promote the quantitative medicament that the plug extrusion discharge needs the injection.

The utility model discloses can use freeze-dried powder injection to come the ration injection, to heat sensitive medicine or the easy degradation medicine of water agent, can avoid high temperature sterilization link and water agent degradation, more be favorable to the permanent quality guarantee of medicine active ingredient, solve the accurate injection problem of the small dose of this type of medicine.

The present invention will be described in further detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the dual chamber cartridge injection device of the present invention;

FIG. 2 is a schematic view of the present invention in a needle-mounting state;

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic structural view of the cartridge holder of the present invention;

fig. 5 is another view angle structure diagram of the cartridge holder of the present invention;

FIG. 6 is a schematic structural view of the pen body of the present invention;

FIG. 7 is a schematic longitudinal sectional view of a pen body according to the present invention;

fig. 8 is a schematic structural view of the screw plunger of the present invention;

FIG. 9 is a schematic view of the pushing screw of the present invention;

fig. 10 is a schematic structural view of the directional disk of the present invention;

FIG. 11 is a schematic view of the safety lock of the present invention;

fig. 12 is a schematic structural view of the rotary push rod of the present invention;

fig. 13 is a schematic structural view of the rotating push rod according to another view angle of the present invention;

FIG. 14 is a schematic view of the safety lock locking position of the present invention;

FIG. 15 is a schematic view of the safety lock of the present invention in an unlocked position;

fig. 16 is a schematic structural view of the connection ring of the present invention;

FIG. 17 is a schematic view of the tail handle reel of the present invention;

FIG. 18 is a schematic diagram of the memory start bit of the present invention;

FIG. 19 is a schematic view of the memory stop of the present invention;

FIG. 20 is a schematic view of the dose adjustment and display assembly of the present invention;

FIG. 21 is a schematic view of the position of the mixing position of the present invention;

FIG. 22 is a schematic cross-sectional view B-B of FIG. 21;

figure 23 is a schematic view of the exhaust release position of the present invention;

FIG. 24 is a schematic cross-sectional view C-C of FIG. 23;

figure 25 is a schematic view of the injection complete position of the present invention;

fig. 26 is a schematic cross-sectional view D-D of fig. 25.

Detailed Description

For convenience in description, the pen cap direction is changed into the lower end, the pen body direction is changed into the upper end, the clockwise and anticlockwise confirmation directions are seen from the lower end to the upper end, the rubber plug, close to the lower end, of the double-cavity cassette bottle 2 is the first rubber plug, the rubber plug, close to the upper end, of the double-cavity cassette bottle is the second rubber plug, the position, close to the lower end, of the safety lock is the locking position, and the position, close to the upper end.

The present embodiment provides an injection device for a dual chamber cartridge, as shown in fig. 1-20, comprising a mixing assembly, a dose adjustment and display assembly, an injection assembly, and a safety assembly.

The liquid mixing component comprises a refill bracket 1, a pen body 3, a screw rod push plug 4 and a push screw rod 5;

be equipped with the cavity that is used for installing two-chamber bayonet type bottle 2 in refill support 1, be provided with coarse pitch external screw thread 101 on the outer disc of refill support 1 upper end, be provided with coarse pitch internal thread 301 on the disc in body of the writing brush 3, link together through this external screw thread 101 and internal thread 301 between refill support 1 and the body of the writing brush 3, refill support 1 clockwise rotation produces axial displacement in body of the writing brush 3 under holding of external force, drives two-chamber bayonet type bottle 2 and moves to the upper end.

In order to facilitate the installation of the dual-cavity cassette bottle 2, as shown in fig. 3, a rectangular groove 102 matched with a side boss on the dual-cavity cassette bottle 2 is arranged in an inner cavity of the cartridge holder 1, wherein a self-resetting spring fastener 103 for limiting the axial sliding of the dual-cavity cassette bottle 2 is arranged on the cartridge holder 1, and the spring fastener 103 is arranged on the upper side of the rectangular groove 102.

Wherein the inner side of the spring fastener 103 is provided with a small bulge 104, the double-cavity cassette bottle 2 can be clamped in the inner side and can not fall out, and the spring fastener 103 can be extruded in the axial direction, so that the side lug bosses can be avoided when the cassette bottle is installed.

Wherein the width of the rectangular groove 102 is only slightly wider than the lateral bosses 201 of the dual-chamber cartridge 2 to control the dual-chamber cartridge 2 not to be able to rotate in the chamber of the cartridge holder 1.

Furthermore, a guide inclined plane 105 matched with the side boss 201 of the double-cavity cassette bottle 2 is arranged on the inner wall of the refill support 1, the guide inclined plane 105 is in a step shape, the bottom of the guide inclined plane 105 is positioned right above the rectangular groove 102, so that the double-cavity cassette bottle 2 can be installed in any direction of 360 degrees when being installed, the direction of the guide inclined plane 105 can be automatically corrected, and the side boss 201 of the double-cavity cassette bottle 2 is automatically aligned with the rectangular groove 102.

As shown in fig. 3-5, a one-way spring 106 is arranged on the pen core support 1, and an anti-reverse groove 302 matched with the one-way spring 106 is arranged in the pen body 3, wherein the pen core support 1 can rotate in one direction in the anti-reverse groove 302;

the screw rod push plug 4 is arranged in the pen body 3, the screw rod push plug 4 is provided with a step groove 401, the end of the push screw rod 5 is provided with a first connecting boss 501 which is in limit fit with the step groove 401, the push screw rod 5 can rotate in the step groove 401 through the first connecting boss 501, and the two are not separated from each other and have a relative rotation connection relation.

Referring to fig. 4 and 5 again, three

positioning grooves

303a, 303b, and 303c for defining the position of the liquid mixing state are provided in the pen body 3 in the embodiment, the pen core holder 1 is provided with the elastic protrusion 107, when the pen core holder 1 is screwed into the pen body 3, the elastic protrusion 107 passes through the three

positioning grooves

303a, 303b, and 303c in sequence, and when the elastic protrusion 107 is matched with the

positioning grooves

303a, 303b, and 303c, the one-way resilient piece 106 is located in the anti-reverse groove 302 (the number of the anti-reverse grooves 302 is also three, and the anti-reverse grooves are in one-to-one correspondence with the

positioning grooves

303a, 303b, and 303 c).

Specifically, the pen core support 1 is provided with display marks (position letters a/B/C) corresponding to the plurality of positioning grooves 303a, 303B, 303C one by one, and the pen body 3 is provided with a reading window 304 for indicating the position of the liquid mixing state in cooperation with the display marks.

In this embodiment, three assembling states exist between the pen core support 1 and the pen body 3, each state has a display identifier, the display is performed through the reading window 304 on the pen body 3, when the pen core support 1 is located at any position, a position letter is opposite to the reading window 304, and a patient can know the state of the injection device conveniently.

In addition, the elastic protrusions 107 can generate a distinct "click" sound to inform the user more clearly when the user is going to move the

positioning grooves

303a, 303b, 303 c.

As shown in fig. 3 and 20, the dose adjustment and display assembly includes a window 11 and a dose adjustment and display knob 12, the window 11 is disposed at the upper end of the pen body 3, a first internal thread (protrusion type) is disposed in the window 11, a first external thread (groove type) 1201 screwed with the first internal thread and a scale mark 1202 spirally distributed are formed on the periphery of the dose adjustment and display knob 12, the number of turns of the first internal thread may be set to be less, for example, less than 2 or 1 turn, so as to reduce the rotational friction force between the first internal thread and the first external thread 1201.

The basic drive mechanism of the injection assembly of this embodiment is substantially similar to the operation of the applicant's prior patent application (publication No. CN108607136A), and is driven in a ratchet manner, as will be understood by reference.

The injection device comprises a rotary push rod 8, a connecting ring 9, a tail handle connecting cylinder 10, a sleeve 13, a release button 14, an elastic element (spring) 15, a second ratchet wheel 16 and a clutch ratchet wheel 17;

the dose adjusting and displaying knob 12 is provided with a first ratchet 1201 therein, and the mounting positions and the matching relationship of the first ratchet 1201, the second ratchet 16 and the clutch ratchet 17 are similar to those of the chinese patent with publication number CN108607136A, and are not described herein again.

The rotary push rod 8, the tail handle connecting cylinder 10 and the sleeve 13 are sequentially arranged from inside to outside in the radial direction, the release button 14 is axially movably arranged at the top of the sleeve 13, and the elastic element 15 is arranged between the tail handle connecting cylinder 10 and the release button 14;

an axial groove 1001 is formed in the inner wall of the tail handle connecting cylinder 10, a second connecting boss 901 is arranged on the outer wall of the connecting ring 9, and the second connecting boss 901 is located in the axial groove 1001;

the connection ring 9 is provided at the upper end of the rotation push rod 8 by a screw connection, and the rotation push rod 8 rotates while the connection ring 9 slides down along the axial groove 1001.

During injection, the needle head protective cover is aligned to an injection part to be pressed to finish the injection needle insertion, then the release button 14 is pressed, the release button 14 extrudes the tail handle connecting cylinder 10 and the dose adjusting and displaying knob 12 to enable the tail handle connecting cylinder 10 and the dose adjusting and displaying knob 12 to rotate, and the tail handle connecting cylinder 10 rotates to drive the connecting ring 9 to move downwards; at the moment, the clutch ratchet wheel 17 and the second ratchet wheel 16 do not have a tooth jumping space, the dose adjusting and displaying knob 12 rotates to drive the clutch ratchet wheel 17, the second ratchet wheel 16 and the rotating push rod 8 to rotate, the rotating push rod 8 rotates to drive the pushing screw rod 5 to rotate to move forwards, the pushing screw rod 5 moves forwards to extrude the sealing piston in the double-cavity cassette bottle 2 to move forwards, the sealing piston moves forwards to extrude mixed liquid medicine in the double-cavity cassette bottle 2, and the liquid medicine with pressure is injected into a body through an injection needle to complete injection.

As shown in fig. 12 to 19, the connection ring 9 in this embodiment has an upper stop 903 and a lower stop 902 for restricting the rotation number thereof, and the rotating push rod 8 is provided with an upper stop 803 and a lower stop 804, wherein the upper stop 903 and the upper stop 803 cooperate to form an upper rotation stop, and the lower stop 902 and the lower stop 804 form a lower rotation stop.

The spiral that go on the rotary push rod 8 of go-between 9 is rotated, be equipped with memory screw thread 802 at the upper end of rotary push rod promptly, the number of turns is confirmed and is the fixed value, based on the cooperation relation between even section of thick bamboo 10 of caudal peduncle and go-between 9, the two has synchronous pivoted ability, the number of turns of caudal peduncle even section of thick bamboo 10 is unanimous with go-between 9, the number of turns of caudal peduncle even section of thick bamboo 10 is exactly the maximum position that the dose can set up, thereby make the dose set up the operation can not set up the injection volume that is greater than the inside surplus medicament volume of two-chamber cassette bottle 2 and.

Further, the upper stop piece 803 is an elastic structure to facilitate the installation of the connection ring 9. Specifically, the upper stop piece 803 can be retracted clockwise for installing the connection ring 9, and can be tilted counterclockwise to prevent the connection ring 9 from rotating further.

The inner thread 904 is arranged in the connecting ring 9, the connecting ring 9 is in threaded connection with the rotating push rod 8, the upper stop position 903 and the lower stop position 902 on the rotating push rod 8 restrict the movement limit of the connecting ring 9, so that the relative rotation number of the connecting ring 9 and the rotating push rod 8 is fixed, the connecting ring 9 is connected with the axial groove 1001 in the tail handle connecting cylinder 10 through the second connecting boss 901 on the outer circular surface, the two can synchronously rotate, and the two can freely slide in the axial direction without limit.

As shown in fig. 10-15, the safety assembly includes a directional disk 6 and a safety lock 7, the directional disk 6 is disposed in the pen body 3 and sleeved on the rotating push rod 8, the safety lock 7 is sleeved on the rotating push rod 8 in an axially displaceable manner, wherein the directional disk 6 has a notch 601, the safety lock 7 has a wave spring 701, a barb 702 and a support rod 703, the support rod 703 is slidably disposed in the notch 601, a lower end surface of the directional disk 6 abuts against the wave spring 701, and the rotating push rod 8 is provided with a first limit boss 801 engaged with the barb 702 to limit rotation of the rotating push rod 8.

When the cartridge holder 1 is screwed into the elastic projection 107 to be matched with the

positioning grooves

303a, 303b and 303c at the uppermost position, the cartridge holder 1 can push the safety lock 7 to slide upwards and press the wave spring 701, and at the moment, the barb 702 is separated from the first limiting boss 801.

In the initial state, the safety lock 7 is in a locking position through the elastic force provided by the wave spring 701, and at the moment, the barb 702 at the rear end of the safety lock 7 abuts against the first limiting boss 801, so that the rotation of the rotating push rod 8 is limited, and the whole injection system cannot be started. When the refill support 1 rotates to the position C, the upper end face of the refill support 1 can push the safety lock 7 to move to the release position, the rotating push rod 8 rotates axially to be in a free state at the moment, and the injection system is in a usable state.

Wherein the peripheral wall of the orientation disk 6 is further provided with a second limit boss 602, the safety lock 7 is provided with a tooth 704 matched with the second limit boss 602, wherein the matching between the tooth 704 and the second limit boss 602 is equivalent to the connection between the notch 601 and the support rod 703, and the purpose of limiting the relative rotation between the safety lock 7 and the orientation disk 6 is achieved, and meanwhile, the safety lock 7 can slide relative to the orientation disk 6.

Safety lock 7 in this embodiment can prevent that 2 mixed liquid of two-chamber cassette bottle from promoting screw rod 5 forward motion before, the plug position is too before by when avoiding mixing liquid, there is unnecessary liquid medicine exhaust phenomenon, the discharge of this kind of liquid medicine is unqualified to the effective dosage of medicine, this maloperation probably exists in the manufacturer, the pharmaceutical factory encapsulation, the commodity circulation transportation jolts and the patient operation in-process, consequently, carry out safety lock 7 through safety lock 7 with the injection function and decide, can effectively avoid product liquid medicine exhaust difficult problem.

As shown in fig. 20 to 26, the states of the liquid mixture state position, the air release unlock position, and the injection completion position are shown, respectively.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make some modifications without departing from the scope of the invention, i.e. all equivalent modifications made according to the invention shall be covered by the scope of the invention.

Claims

1. An injection device for a double-cavity cassette bottle comprises a liquid mixing component, an injection component and a safety component, and is characterized in that the liquid mixing component comprises a refill support, a pen body, a screw rod push plug and a push screw rod;

a cavity for mounting a double-cavity clamping type bottle is arranged in the refill support;

the pen core support is in threaded connection with the pen body, a one-way elastic sheet is arranged on the pen core support, an anti-reverse groove matched with the one-way elastic sheet is formed in the pen body, and the pen core support can rotate in one direction in the anti-reverse groove;

the screw rod push plug is arranged in the pen body and provided with a step groove, a first connecting boss in limit fit with the step groove is arranged at the end part of the push screw rod, and the push screw rod can rotate in the step groove through the first connecting boss;

the pen comprises a pen body, a pen core support and a one-way spring piece, wherein a plurality of positioning grooves used for limiting the position of a liquid mixing state are formed in the pen body, elastic bulges are arranged on the pen core support, when the pen core support is rotated and screwed into the pen body, the elastic bulges sequentially pass through the plurality of positioning grooves, and when the elastic bulges are matched with the positioning grooves, the one-way spring piece is positioned in the anti-inversion groove.

2. The injection device for the dual-chamber cassette bottle as claimed in claim 1, wherein a display mark corresponding to a plurality of said positioning grooves one to one is provided on said cartridge holder, and a reading window for indicating a position of a liquid mixing state in cooperation with said display mark is provided on said pen body.

3. The injection device for the dual chamber cartridge of claim 1, wherein the inner chamber of the cartridge holder is provided with a rectangular groove in which a side boss of the dual chamber cartridge is fitted, and wherein the cartridge holder is provided with a self-resetting snap fastener for restricting the axial sliding of the dual chamber cartridge, the snap fastener being disposed on an upper side of the rectangular groove.

4. The injection device for the dual-chamber cartridge bottle as set forth in claim 3, wherein the cartridge holder inner wall is provided with a guide slope surface which is fitted with the side boss of the dual-chamber cartridge bottle, and the bottom of the guide slope surface is positioned right above the rectangular groove.

5. The injection device for a dual chamber cartridge of claim 1, wherein said injection device comprises a release button, a resilient member, a tail stem union, a sleeve, a coupling ring, a rotary push rod;

6. The injection device for a dual-chamber cartridge bottle of claim 5, wherein said coupling ring has an upper stop and a lower stop for limiting the number of rotations of said coupling ring, said rotary push rod having an upper stop plate and a lower stop plate, wherein said upper stop and said upper stop plate cooperate to form an upper rotation stop, and said lower stop plate form a lower rotation stop.

7. The dual chamber cartridge bottle injection device of claim 6 wherein said upper stop tab is resilient in construction.

8. The injection device for the dual-chamber bottle of claim 5, wherein the safety assembly comprises a directional plate and a safety lock, the directional plate is disposed in the pen body and sleeved on the rotary push rod, the safety lock is sleeved on the rotary push rod in an axially displaceable manner, the directional plate has a gap, the safety lock is provided with a support rod, a wave spring and a barb, the support rod is slidably disposed in the gap, the lower end surface of the directional plate abuts against the wave spring, and the rotary push rod is provided with a first limit boss matched with the barb to limit the rotation of the rotary push rod.

9. The injection device for a dual chamber cartridge of claim 8, wherein said cartridge holder is capable of pushing said safety lock to slide upward and compress said wave spring when said cartridge holder is screwed into said elastic projection to engage with said positioning groove at the uppermost position, at which time said barb is disengaged from said first stopper projection.

10. The dual chamber vial injector of claim 8, wherein the outer peripheral wall of the orienting disk further defines a second stop ledge, and wherein the safety lock defines teeth for engaging the second stop ledge.