CN112472984B

CN112472984B - Nasal cavity drug delivery device

Info

Publication number: CN112472984B
Application number: CN202011481667.XA
Authority: CN
Inventors: 王锦君; 段胜凯
Original assignee: Luoyang Fu Dao Biological Technology Co ltd; Shijiazhuang Xinfuda Pharmaceutical Packing Co ltd
Current assignee: Luoyang Fu Dao Biological Technology Co ltd; Shijiazhuang Xinfuda Pharmaceutical Packing Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2023-01-03
Anticipated expiration: 2040-12-15
Also published as: CN112472984A

Abstract

The invention provides a nasal cavity administration device, which belongs to the field of medical spraying devices and comprises an injector, a push rod, an inner shell, an outer shell, a circumferential limiting structure and a circumferential stopping structure; a first anti-back buckle is arranged in the injector; the push rod is arranged in the injector in a sliding manner, and the front end of the push rod is provided with an anti-withdrawal end head matched with the first anti-withdrawal buckle; the inner shell is in threaded fit with the front end of the injector; the outer shell is covered outside the inner shell, and the outer shell and the inner shell are clamped and matched in the front-back direction; the circumferential limiting structure is arranged between the outer shell and the inner shell; the circumferential retaining structure is arranged between the injector and the shell. The push rod comprises a first rod body and a second rod body arranged behind the first rod body, the first rod body and the second rod body are connected through a breakpoint structure, a piston is sleeved on the periphery of the first rod body, and the piston is in sealing butt joint with the inner wall of the injector. The nasal cavity administration device provided by the invention is provided with effective anti-back self-destruction structures among all main components, so that the components are prevented from being disassembled and repeatedly used.

Description

Nasal cavity drug delivery device

Technical Field

The invention belongs to the technical field of medical spraying devices, and particularly relates to a nasal cavity drug delivery device.

Background

The nasal cavity administration device is a device for spraying approximately vaporous treatment fluid into nostrils, is gradually a commonly adopted treatment means due to the advantages of low risk, quick treatment effect, pain reduction and the like, is suitable for the fields of rhinitis treatment, influenza vaccination and the like, and the spray type treatment method is accepted by vast medical care personnel and patients. Because of the risk of cross infection, many nasal cavity medicine feeders are disposable medical equipment, however, current nasal cavity medicine feeder is difficult to effectively avoid the risk of reuse, and reuse can still be dismantled to partial spare part etc. and this kind of medical waste product of reutilization flows into market and can cause the threat to patient's healthy undoubtedly.

Disclosure of Invention

The invention aims to provide a nasal cavity administration device, and aims to solve the technical problems that in the prior art, the self-destruction of a nasal cavity sprayer is poor, and part of parts can still be detached for use.

In order to achieve the purpose, the invention adopts the technical scheme that: there is provided a nasal delivery device comprising:

the syringe is internally provided with a first anti-withdrawal buckle;

the push rod is arranged in the injector in a sliding manner, the front end of the push rod is provided with an anti-withdrawal end head matched with the first anti-withdrawal buckle, and the first anti-withdrawal buckle can limit the anti-withdrawal end head at the rear side of the anti-withdrawal end head;

the inner shell is in threaded fit with the front end of the injector, and the front part of the inner shell is provided with a communication port;

the outer shell is covered outside the inner shell, the outer shell and the inner shell are in clamping fit in the front-back direction, and the injector is communicated with the nozzle at the front end of the outer shell through the communication port;

the circumferential limiting structure is arranged between the outer shell and the inner shell and used for preventing the outer shell and the inner shell from rotating relatively; and

the circumferential retaining structure is arranged between the injector and the outer shell and used for preventing the outer shell from rotating in a direction opposite to a preset installation rotating direction of the inner shell, and the preset installation direction is the rotating direction for rotatably screwing the inner shell to the injector;

the push rod comprises a first rod body and a second rod body arranged behind the first rod body, the first rod body is connected with the second rod body through a breakpoint structure, a piston is sleeved on the periphery of the first rod body, and the piston is in sealing butt joint with the inner wall of the injector.

As another embodiment of this application, the syringe includes first section and locates the second section of first section front end, the inner shell with the outer shell is equallyd divide and is connected with the front end of second section respectively, the rear end and the middle part of second section are equipped with the seal membrane respectively, the front end of first section also is equipped with the seal membrane, form first seal chamber between the seal membrane in the first section and the push rod, form the second seal chamber between two the seal membrane in the second section;

the front end of the first section and the rear end of the second section are respectively provided with a first puncture needle, the first puncture needle on the first section extends forwards, the first puncture needle on the second section extends backwards, the first puncture needle on the front end of the first section can puncture the sealing membrane on the rear end of the second section, and the first puncture needle on the rear end of the second section can puncture the sealing membrane on the first section;

the front end of the anti-withdrawal end head is in a sharp-pointed shape, and the front end of the anti-withdrawal end head can pierce a sealing film positioned in the middle of the second section.

As another embodiment of the application, the front end of the first section is fixedly provided with an internal thread ring, and the outer wall of the rear part of the second section is provided with an external thread matched with the internal thread ring.

As another embodiment of this application, the shell inner wall is equipped with the axial positioning buckle, the inner shell outer wall be equipped with axial positioning buckle joint complex axial positioning is protruding.

As another embodiment of the present application, the circumferential limiting structure includes:

the plurality of circumferential limit convex teeth are arranged on the outer wall of the inner shell along the circumferential direction of the inner shell; and

the circumferential limiting convex blocks are arranged on the inner wall of the shell and can be inserted between every two adjacent circumferential limiting convex teeth.

As another embodiment of the application, the rear ends of the circumferential limit convex teeth extend outwards to form the axial locating bulge.

As another embodiment of the present application, the circumferential backstop structure includes:

the plurality of circumferential stopping convex teeth are arranged on the outer wall of the injector along the circumferential direction of the injector; and

circumference stopping card, the outer end connect in the inner wall of shell, adjacent two can be gone into to circumference stopping card between the circumference stopping dogtooth, the inner slope setting of circumference stopping card, its incline direction with it is opposite to predetermine the installation soon.

As another embodiment of this application, the front end of syringe has the collar, the medial surface of collar be equipped with the outer wall screw-thread fit's of inner shell internal thread structure, the lateral surface of collar is equipped with circumference stopping dogtooth.

As another embodiment of the present application, an injection cavity is formed by the outer shell and the injector in a matching manner, an atomization cavity is arranged between the outer wall of the front portion of the inner shell and the inner wall of the front portion of the outer shell, the atomization cavity is communicated with the injection cavity through the communication port, and the atomization cavity is further communicated with the nozzle; the top wall of the atomization cavity is provided with spiral grooves which are distributed radially around the axis of the nozzle, and the top of the atomization cavity is communicated with the outer end part of the spiral groove.

As another embodiment of the present application, the outer end of the spiral groove has a circular arc shape.

The nasal cavity drug delivery device provided by the invention has the beneficial effects that: compared with the prior art, in the nasal cavity administration device, after the anti-retreat end is clamped into the first anti-retreat buckle, the push rod cannot be integrally pulled out, if the push rod is pulled out by force, the breakpoint structure is broken, the second rod body is separated from the first rod body, and finally, the second rod body can only be pulled out, and the first rod body is still limited by the first anti-retreat buckle; in addition, not only be equipped with between push rod and the syringe and prevent moving back the self-destruction structure, because the joint has limited circumferential relative position between inner shell and the shell through circumference limit structure, in addition threaded connection between inner shell and the syringe, if will dismantle the shell, must follow the reverse of predetermineeing the installation rotation direction and twist soon the shell, and circumference backstop structure has prevented this motion again, if will dismantle the shell by force the shell will probably damage the shell, this just makes circumference backstop structure form prevents moving back the self-destruction structure, effectively avoided the complete possibility of dismantling the shell, avoid the shower nozzle structure that shell and inner shell formed to be recycled. The nasal cavity administration device of the invention is provided with effective anti-back self-destruction structures among all main components, thus improving the self-destruction of the administration device and preventing parts from flowing into the market again to harm the personal safety of users.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a cross-sectional view of a nasal delivery device according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a syringe used in an embodiment of the present invention;

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

FIG. 4 is a schematic structural diagram of a push rod according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of an assembled structure of an inner shell and an outer shell as utilized in one embodiment of the present invention;

FIG. 6 is a bottom view of FIG. 5;

FIG. 7 is a schematic structural view of an inner case used in an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a housing utilized in one embodiment of the present invention;

FIG. 9 is a bottom view of FIG. 8;

fig. 10 is a partial sectional view of a nasal cavity administration device according to a second embodiment of the present invention;

FIG. 11 is a schematic view of the assembled structure of the syringe and the plunger used in the third embodiment of the present invention;

FIG. 12 is an enlarged view of a portion of the push rod of FIG. 11;

fig. 13 is a partially enlarged view of fig. 11.

In the figure: 1. an injector; 101. a first stage; 102. a second stage; 103. a sealing film; 104. a first sealed chamber; 105. a second sealed chamber; 106. a first puncture needle; 108. an internally threaded ring; 2. a push rod; 201. a first rod body; 202. a second rod body; 203. a breakpoint structure; 204. a piston; 3. an inner shell; 301. an inner shell external thread; 4. a housing; 5. a first anti-back buckle; 6. a withdrawal prevention end; 7. a communication port; 8. a spout; 9. axially positioning the buckle; 10. an axial positioning projection; 11. circumferential limit convex teeth; 12. a circumferential limit bump; 13. circumferential stopping convex teeth; 14. a circumferential backstop card; 15. a mounting ring; 16. an injection chamber; 17. an atomizing chamber; 18. a helical groove; 19. a second anti-back buckle; 20. a spherical buffer head.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the term "axial direction" in the present invention is parallel to the front-rear direction.

Referring to fig. 1 and 2 together, the nasal administration device of the present invention will now be described. The nasal cavity drug delivery device comprises an injector 1, a push rod 2, an inner shell 3, an outer shell 4, a circumferential limiting structure and a circumferential stopping structure; a first anti-back buckle 5 is arranged in the injector 1; the push rod 2 is arranged in the injector 1 in a sliding manner, the front end of the push rod 2 is provided with an anti-withdrawal end head 6 matched with the first anti-withdrawal buckle 5, and the first anti-withdrawal buckle 5 can limit the anti-withdrawal end head 6 at the rear side of the anti-withdrawal end head 6; the inner shell 3 is in threaded fit with the front end of the injector 1, and the front part of the inner shell 3 is provided with a communication port 7; the outer shell 4 covers the inner shell 3, the outer shell 4 and the inner shell 3 are in clamping fit in the front-back direction, and the injector 1 is communicated with a nozzle 8 at the front end of the outer shell 4 through a communication port 7; the circumferential limiting structure is arranged between the outer shell 4 and the inner shell 3 and is used for preventing the outer shell 4 and the inner shell 3 from rotating relatively; the circumferential retaining structure is provided between the syringe 1 and the outer housing 4 for preventing the outer housing 4 from rotating in a direction opposite to a preset mounting direction of the inner housing 3, which is a direction of screwing the inner housing 3 to the syringe 1. The push rod 2 comprises a first rod body 201 and a second rod body 202 arranged behind the first rod body 201, the first rod body 201 and the second rod body 202 are connected through a breakpoint structure 203, a piston 204 is sleeved on the periphery of the first rod body 201, and the piston 204 is in sealing butt joint with the inner wall of the injector 1.

Compared with the prior art, the nasal cavity administration device provided by the invention has the advantages that after the anti-withdrawal end 6 is clamped into the first anti-withdrawal buckle 5, the push rod 2 cannot be integrally pulled out, if the push rod 2 is pulled out forcibly, the breakpoint structure 203 is broken, the second rod body 202 is separated from the first rod body 201, finally, only the second rod body 202 can be pulled out, and the first rod body 201 is still limited by the first anti-withdrawal buckle 5; in addition, not only be equipped with between push rod 2 and the syringe 1 and prevent moving back the self-destruction structure, because the joint has limited the relative position of circumference between inner shell 3 and the shell 4 through circumference limit structure, in addition threaded connection between inner shell 3 and the syringe 2, if will dismantle the shell, must follow the reverse of predetermineeing the installation rotation direction and twist the shell 4 soon, and the motion has been prevented again to circumference backstop structure, if dismantle shell 4 by force will damage shell 4, this just makes circumference backstop structure form and prevents moving back the self-destruction structure, effectively avoided the complete possibility of dismantling shell 4, avoid shell 3 and the shower nozzle structure that inner shell 4 formed to be recycled. The nasal cavity administration device of the invention is provided with effective anti-back self-destruction structures among all main parts, thus improving the self-destruction of the administration device and preventing the parts from being detached and flowing into the market again to harm the personal safety of users.

In addition, the self-destruction structure (the first anti-retreating buckle 5) matched with the push rod 2 is arranged in the injector 1, compared with the spray head structure, the nasal administration device is simpler to manufacture, does not occupy the limited space in the spray head, is beneficial to optimizing the spray head structure, reduces the difficulty in manufacturing and assembling the spray head, and further reduces the production cost.

Specifically, breakpoint structure 203 is equipped with two sets ofly, and two sets of breakpoint structures 203 are located the both sides of first body of rod 201 rear end portion respectively, and the front end of the second body of rod 202 is equipped with groove structure, and groove structure's both sides wall is connected with first body of rod 201 through breakpoint structure 203 respectively.

In order to solve the problems, an embodiment is provided, referring to fig. 11 to 13, in which the injector 1 includes a first section 101 and a second section 102 disposed at a front end of the first section 101, the inner casing 3 and the outer casing 4 are respectively connected to a front end of the second section 102, the rear end and the middle of the second section 102 are respectively provided with a sealing film 103, the front end of the first section 101 is also provided with the sealing film 103, such that a first sealing cavity 104 is formed between the sealing film 103 and the push rod 2 in the first section 101, a second sealing cavity 105 is formed between the two sealing films 103 in the second section 102, the first sealing cavity 104 can be filled with liquid medicine, and the second sealing cavity 105 can be filled with liquid or powdered medicine. Meanwhile, the front end of the first section 101 and the rear end of the second section 102 are respectively provided with a first puncture needle 106, the first puncture needle 106 on the first section 101 extends forwards, the first puncture needle 106 on the second section 102 extends backwards, when the first section 101 and the second section 102 are installed, the first puncture needle 106 on the front end of the first section 101 can puncture the sealing film 103 on the rear end of the second section 102, the first puncture needle 106 on the rear end of the second section 102 can puncture the sealing film 103 on the first section 101, and the nasal cavity administration device can be shaken to uniformly mix the medicine in the first sealing cavity 104 and the medicine in the second sealing cavity 105. In addition, the front end of the anti-withdrawal end head 6 is in a sharp-pointed shape, when the medicines in the two cavities are mixed, the push rod 2 is pushed forward, the front end of the anti-withdrawal end head 6 penetrates the sealing film 103 at the front end of the first section 101 and the sealing film 103 at the rear end of the second section 102 one by one, finally the sealing film 103 in the middle of the second section 102 can be penetrated, the area of the broken opening can be enlarged by the push rod 2, and the medicine liquid finally flows to the front end of the second section 102.

In the embodiment, the injector is arranged in a sectional form, different kinds of medicines are separately stored in a sealed mode and are mixed only before use, so that the storage period of the medicines is greatly prolonged, and a certain storage space can be saved.

Furthermore, the front end of the first section 101 is fixedly provided with an internal thread ring 108, the outer wall of the rear part of the second section 102 is provided with an external thread matched with the internal thread ring 108, the first section 101 and the second section 102 are matched by adopting a thread structure, so that the connection between the first section 101 and the second section 102 is firmer, and in the process that the first puncture needle 106 punctures the sealing membrane 103, the first puncture needle 106 can move a certain distance on the radial surface of the sealing membrane 103, so that the area of a puncture on the sealing membrane 103 is enlarged, and the two medicines are mixed.

It should be noted that there is no interference between the first spike 106 on the first section 101 and the first spike 106 on the second section 102, and therefore the size of the threads is controlled to ensure that the first spike 106 does not interfere with the sealing membrane 103 before it makes effective contact therewith. Alternatively, as shown in FIG. 13, a corresponding space-avoiding groove structure is provided on the protruding rod of the first spike 106 at the front end of the first section 101, and a corresponding space-avoiding recess is provided on the corresponding sealing film 103.

Further, the first section 101 and the second section 102 can be inserted or snap-fitted in the front-back direction.

Referring to fig. 1, 3, 7, 10 and 11, in order to simplify the structure, the rear end of the inner housing 3 is provided with an inner housing external thread 301 which is matched with the injector 1.

Referring to fig. 1, 5 to 10, an axial positioning buckle 9 is disposed on an inner wall of the outer shell 4, and an axial positioning protrusion 10 engaged with the axial positioning buckle 9 is disposed on an outer wall of the inner shell 3. During the installation, promote outer shell 4 to the direction of inner shell 3, until axial positioning buckle 9 card at the rear side of axial positioning arch 10, form the shower nozzle structure, aim at syringe 1 with the shower nozzle structure afterwards, twist the spiral shell and connect in syringe 1, its simple structure, the location is reliable, can effectually combine outer shell 4 and inner shell 3.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, 5 to 10, wherein the circumferential limiting structure includes a circumferential limiting convex tooth 11 and a circumferential limiting convex block 12; a plurality of circumferential limit convex teeth 11 are arranged on the outer wall of the inner shell 3 along the circumferential direction of the inner shell 3; the circumferential limit convex block 12 is arranged on the inner wall of the shell 4, and the circumferential limit convex block 12 can be inserted between two adjacent circumferential limit convex teeth 11. This embodiment carries on spacingly through the dogtooth structure, and structural strength is high, and is spacing effectual, is favorable to improving the wholeness of inner shell 3 and shell 4.

Referring to fig. 1, 5 to 10, in order to simplify the structure and make the structure more compact, the rear end of the circumferential limit tooth 11 extends outward to form an axial positioning protrusion 10, that is, the outer end of the circumferential limit tooth 11 is the axial positioning protrusion 10.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1, 5 to 10, in which the circumferential retaining structure includes a circumferential retaining tooth 13 and a circumferential retaining clip 14; the plurality of circumferential stopping convex teeth 13 are arranged on the outer wall of the injector 1 along the circumferential direction of the injector 1 of the injector 13; the circumferential stopping clamping pieces 14 are arranged on the inner wall of the shell 4, the circumferential stopping clamping pieces 14 can be clamped between two adjacent circumferential stopping convex teeth 13, the inner ends of the circumferential stopping clamping pieces 14 are arranged in an inclined mode, and the inclined direction of the inner ends is opposite to the preset installation rotating direction. Taking the view of fig. 6 as an example, when the aforementioned nozzle structure is installed, the inner shell 3 and the outer shell 4 rotate counterclockwise synchronously, and the circumferential retaining clip 14 can slide on the counterclockwise periphery of the circumferential retaining tooth 13 without affecting the screwing installation of the inner shell 3; if the shell 4 is rotated clockwise, the circumferential retaining card 14 is clamped between two adjacent circumferential retaining convex teeth 13, and further clockwise rotation cannot be realized, and if the circumferential retaining card 14 or the part of the shell 4 near the circumferential retaining card 14 is forcibly rotated, the circumferential retaining card 14 or the part of the shell 4 near the circumferential retaining card is broken and cannot be used again.

Referring to fig. 1 to 13, as a specific implementation manner of the embodiment of the present invention, the front end of the injector 1 is provided with a mounting ring 15, the inner side surface of the mounting ring 15 is provided with an internal thread structure in threaded fit with the outer wall of the inner shell 3, and the outer side surface of the mounting ring 15 is provided with a circumferential stopping convex tooth 13. Through setting up collar 15, provide connection platform for spiro union structure and circumference stopping structure for the structure is compacter, has not only reduced the volume, can also simplify the installation procedure.

As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 to 13, an injection cavity 16 is formed between the outer shell 4 and the injector 1, an atomization cavity 17 is disposed between the front outer wall of the inner shell 3 and the front inner wall of the outer shell 4, the atomization cavity 17 is communicated with the injection cavity 16 through the communication port 7, and the atomization cavity 17 is further communicated with the nozzle 8; the top wall of the atomizing cavity 17 is provided with a spiral groove 18, the spiral groove 18 is distributed in a radial shape around the axis of the nozzle 8, and the top of the atomizing cavity 17 is communicated with the outer end part of the spiral groove 18. The liquid medicine flows into the atomizing cavity 17 from the injection cavity 16 through the communicating port 7 by the extrusion of the push rod 2, and atomized liquid drops can be sprayed out through the nozzle 8 by the pressurization effect of the atomizing cavity 17 and the guiding effect of the spiral groove 18, so that the atomizing effect is good.

It should be noted that the outer casing 4 is an umbrella structure, and the outer diameter gradually increases from front to back, so as to conveniently extend into the nasal cavity.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 9, in order to enhance the atomization effect, the outer end of the spiral groove 18 is arc-shaped.

Referring to fig. 1 to 13, in order to effectively prevent the syringe from being reused 1 times, the first anti-back-off clip 5 is located at the front end of the syringe 1, and the push rod 2 is pushed to the bottom and then cannot move backward.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 10, the anti-receding end 6 is a cone with a narrow front and a wide back, and the side surface of the anti-receding end 6 is an inward concave curved surface; the nasal cavity ware of dosing still includes that the second prevents moving back buckle 19, and the second prevents moving back buckle 19 and is equipped with the multiunit in the first rear of preventing moving back buckle 5 along the axial of syringe 1, and the place ahead of every group of second prevents moving back buckle 19 all corresponds and is equipped with spherical buffer head 20, when preventing moving back end 6 and cross one of them group of second and prevent moving back buckle 19, spherical buffer head 20 butt in the side of preventing moving back end 6. In this embodiment, the second is prevented moving back 19 and is acted on first and prevent moving back 5 that buckles are similar, and spherical buffer head 20 can be prevented moving back end 6 and cross behind one of them second and prevent moving back 19 and produce the resistance for push rod 2, and then produce the card pause and feel, continue propulsive the word, prevent moving back end 6 and can cross spherical buffer head 20 and continue to advance. Through the technical scheme who adopts this embodiment, every a set of second is prevented moving back buckle 19's the setting position and is all corresponding different dosing amount for accurate discontinuity is given medicine can be realized to this embodiment's nasal cavity ware of dosing, need not medical personnel to observe the scale on the syringe 1 repeatedly simultaneously, and it is more convenient to use.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A nasal delivery device, comprising:

the syringe is internally provided with a first anti-withdrawal buckle;

the push rod comprises a first rod body and a second rod body arranged behind the first rod body, the first rod body is connected with the second rod body through a breakpoint structure, a piston is sleeved on the periphery of the first rod body, and the piston is in sealing butt joint with the inner wall of the injector;

still include the second and prevent moving back the buckle, the second is prevented moving back the buckle and is followed the axial of syringe in the first rear of preventing moving back the buckle is equipped with the multiunit, each group the place ahead that the buckle was prevented moving back by the second all corresponds and is equipped with spherical buffer head, works as prevent moving back the end and cross one of them group when the buckle is prevented moving back by the second, spherical buffer head butt is in preventing moving back the side at end.

2. The nasal delivery device of claim 1, wherein the syringe includes a first section and a second section disposed at a front end of the first section, the inner and outer casings each being connected to a front end of the second section, the second section having a sealing membrane disposed at a rear end and a middle portion thereof, the front end of the first section also having a sealing membrane, the sealing membrane of the first section and the pushrod defining a first sealed chamber therebetween, and the second section having a second sealed chamber defined therebetween;

3. The nasal delivery device of claim 2, wherein the first section has an internally threaded ring secured to a front end thereof and the second section has an external thread on an outer wall of a rear portion thereof for engaging the internally threaded ring.

4. The nasal delivery device of claim 1, wherein the inner wall of the outer housing has an axial positioning tab and the outer wall of the inner housing has an axial positioning protrusion that snap fits into the axial positioning tab.

5. The nasal delivery device of claim 4, wherein the circumferential stop comprises:

the plurality of circumferential limiting convex teeth are arranged on the outer wall of the inner shell along the circumferential direction of the inner shell; and

6. The nasal delivery device of claim 5, wherein the rearward end of the circumferential stop lobe extends outwardly to form the axial locating projection.

7. The nasal delivery device of claim 2, wherein the circumferential backstop structure comprises:

8. The nasal delivery device of claim 7, wherein the front end of the syringe has a mounting ring, the inner side of the mounting ring is provided with an internal thread structure that is threadedly engaged with the outer wall of the inner housing, and the outer side of the mounting ring is provided with the circumferential backstop protrusion.

9. The nasal delivery device of claim 1, wherein the outer casing and the injector cooperate to form an injection cavity, an atomization cavity is provided between the front outer wall of the inner casing and the front inner wall of the outer casing, the atomization cavity is communicated with the injection cavity through the communication port, and the atomization cavity is further communicated with the nozzle; the top wall of the atomization cavity is provided with spiral grooves which are distributed radially around the axis of the nozzle, and the top of the atomization cavity is communicated with the outer end part of the spiral groove.

10. The nasal delivery device of claim 9, wherein the helical groove has an arcuate outer end.