CN116251285A

CN116251285A - Buccal nasopharynx locking and expanding drug delivery device

Info

Publication number: CN116251285A
Application number: CN202310541526.XA
Authority: CN
Inventors: 安光辉; 喻益峰; 郑倩
Original assignee: Shanghai University of Traditional Chinese Medicine
Current assignee: Shanghai University of Traditional Chinese Medicine
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-06-13
Anticipated expiration: 2043-05-15
Also published as: CN116251285B

Abstract

The invention provides a buccal nasopharynx locking and expanding drug delivery device, and belongs to the technical field of buccal drug delivery devices; comprises a main shell and an auxiliary shell fixedly connected to one side of the outer wall of the main shell through a bolt component, the inside of the main shell and the auxiliary shell is rotationally connected with a driving block through a rotating shaft. According to the invention, the expansion mechanism is arranged, when the medicine is required to be administered to a wound after the oral cavity operation of a patient, the main shell and the auxiliary shell are held to move, so that the front ends of the main shell and the auxiliary shell extend into the oral cavity of the patient, the main baffle and the auxiliary baffle are positioned below the soft palate, then the two groups of fixed shafts are reversely rotated by operating the driving mechanism, the auxiliary baffle and the main baffle are driven by the reverse rotation of the two groups of fixed shafts to synchronously reversely rotate and outwards expand, and the space between the soft palate, the pharyngopal arch and the pharyngeal rear wall is opened, thereby being convenient for the medicine administration mechanism to administer medicine and spray the surface of the wound, further effectively acting on the surface of the gland sample, and effectively alleviating the risk of postoperative recurrence by medicines.

Description

Buccal nasopharynx locking and expanding drug delivery device

Technical Field

The invention relates to the technical field of buccal drug delivery devices, in particular to a buccal nasopharynx locking expansion drug delivery device.

Background

Adenoid hypertrophy is a common disease affecting the health of children, and current western medicine surgical excision is a clinical first-line scheme, but transient oral edema can appear on wounds after surgery, swelling appears on oropharynx parts and nasal cavity parts, parents can use nasal spray or oral medicine for children, and the risk of adhesion and recurrence in the oral cavity can be reduced.

At present, the nasal hormone medicine can be directly smeared on the affected part to effectively relieve rhinitis symptoms, but the postoperative wound is deeper at the throat part of the oral cavity, and the postoperative oropharynx and the channel between the nasopharynx are due to the soft palate and the pharyngopalatine arch

With the back wall adhesion of pharynx and narrowing for the medicine is difficult to carry out the cladding to the affected part, and effectively acts on the glandular surface, leads to the postoperative recurrence risk improvement, consequently, this application provides a buccal nasopharyngeal closure expansion drug delivery ware and satisfies the demand.

Disclosure of Invention

The invention aims to solve the technical problem of providing a buccal nasopharyngeal latch and expand drug delivery device to solve the problem that the existing channels between the postoperative oropharynx and the nasopharynx are narrowed due to adhesion between the soft palate and the pharyngopalatine arch and the pharyngeal rear wall, so that the affected part is difficult to be coated by a drug, the drug liquid is difficult to effectively act on the surface of an adenoid body, and the postoperative recurrence risk is increased.

In order to solve the technical problems, the invention provides the following technical scheme:

a buccal nasopharyngeal latch expansion applicator comprising: the main shell and the auxiliary shell are fixedly connected to one side of the outer wall of the main shell through a bolt assembly, a driving block is rotatably connected to the inside of the main shell and the inside of the auxiliary shell through a rotating shaft, and the expansion mechanism is used for expanding a wound of a patient and is connected with the main shell and the auxiliary shell; the drug delivery mechanism is used for spraying and covering the wound of the patient, is respectively connected with the main shell and the auxiliary shell and is positioned below the expansion mechanism, and is respectively connected with the main shell and the auxiliary shell; and the driving mechanism is used for driving the expanding mechanism and the drug delivery mechanism to operate.

Preferably, the expansion mechanism comprises a main baffle arranged in the main shell and the auxiliary shell and extending to the top of the main shell and the top of the auxiliary shell, an auxiliary baffle is arranged at one end of the outer wall of the main baffle, fixing shafts are fixedly connected to two sides of one end, far away from each other, of the main baffle and the auxiliary baffle, two groups of mounting blocks are symmetrically and fixedly connected to the inner top ends of the main shell and the auxiliary shell, the fixing shafts respectively extend to the two groups of mounting blocks, and the main baffle and the auxiliary baffle are respectively connected with the main shell and the auxiliary shell in a rotating manner through the two groups of fixing shafts.

Preferably, the actuating mechanism is in including fixed connection the fixed block of the inside bottom of main shell, the inside of fixed block is provided with spacing spring, spacing spring's top is provided with the gag lever post, the gag lever post activity sets up the inside of fixed block, the drive slot has been seted up to the inside bottom of gag lever post, the inside fixedly connected with toper piece of drive slot, the inside equidistance of piston rod is provided with the multiunit and extends to the spacing hole of piston rod bottom, the upper end of gag lever post is the inclined plane structure, the inclined plane structure extends to the inside of spacing hole, the outer wall of the lower extreme of main shell is provided with the through-hole, the inside of through-hole is provided with the connecting wire, the other end of connecting wire extends to the inside of drive block, the equal fixedly connected with solid fixed ring in both ends of connecting wire, the connecting wire passes through gu fixed ring block is in between main shell and the drive block, the outer wall fixedly connected with mount of gag lever post, the top fixedly connected with U type pole, the symmetrical fixedly connected with two sets of racks at the both ends at U type pole top.

Preferably, the outer wall of the fixed shaft takes the fixed shaft as a circle center and is fixedly connected with a plurality of groups of clamping teeth in a ring shape, and the fixed shaft is meshed with the rack through the clamping teeth.

Preferably, the middle part of the connecting wire penetrates through the driving groove, the connecting wire is located at the top of the conical block, and the top of the conical block is provided with an arc-shaped surface.

Preferably, the inside of multiunit the installation piece is provided with respectively with multiunit latch external diameter assorted holding tank, the inside of installation piece still be provided with rack assorted bar groove, the holding tank is linked together with the bar groove.

Preferably, the inside of fixed block be provided with gag lever post assorted mounting groove, gag lever post and spacing spring all are located the inside of mounting groove, the gag lever post pass through the mounting groove with fixed block sliding connection.

Preferably, a through hole which extends to the bottom of the infusion tube and is matched with the limiting rod is formed in the infusion tube, and the limiting rod penetrates through the through hole and extends to the inside of the limiting hole.

Compared with the prior art, the invention has at least the following beneficial effects:

in the scheme, through setting up expansion mechanism, when needs are dosed to patient's oral cavity postoperative wound department, remove through holding main shell and auxiliary shell, make main shell and auxiliary shell's front end extend to patient's oral cavity in, make main baffle and auxiliary baffle be located soft palate's below, then make two sets of fixed axles reverse rotation each other through operation actuating mechanism, the reverse rotation of two sets of fixed axles drives auxiliary baffle and main baffle and carries out synchronous reverse rotation outward expansion, open the space between soft palate and pharyngopal arch and the pharyngeal backwall, thereby be convenient for dosing mechanism is dosed the wound surface and is spouted and cover, and then effectively act on the glandular sample surface, effectively alleviate the risk of reducing postoperative recurrence through the medicine.

Through setting up mechanism of dosing, after opening the space between soft palate and pharyngopal arch and the back wall of pharynx, release the spacing operation to the piston rod through operating actuating mechanism, actuating spring's reset action drives actuating spring and removes to the inside of pull rod this moment, and the pull rod removes the promotion piston rod and removes, and the removal of piston rod promotes the liquid medicine and flows in the inside of transfer line to effectively spout the surface at the wound through the atomizer, accomplish the operation of dosing to the adenoid body.

Through setting up actuating mechanism, through buckling the actuating block, make the actuating block rotate with the pivot as the centre of a circle, the rotation of actuating block drives the connecting wire whole and straightens, and push down the toper piece, make toper piece down move and compress spacing spring, the down movement of toper piece drives the gag lever post down to move, the gag lever post moves and drives the mount down to move, the mount down moves and drives U type pole down to move, U type pole moves and drives multiunit rack synchronous down to move, the removal of rack drives the fixed axle through the latch drive fixed axle of fixed axle outer wall and rotates, follow drive expanding mechanism and function, accomplish the expansion operation to patient's oral cavity inside wound, operate through lasting buckling the actuating block in this process, when gag lever post and spacing hole are completely separated, main baffle and auxiliary baffle accomplish the expansion, and release the spacing operation to the piston rod thereby make dosing mechanism operate, carry out the operation of spraying of dosing operation to patient wound department, accomplish the operation to the gland sample body.

Drawings

The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure.

FIG. 1 is a schematic perspective view of a buccal nasopharyngeal latch and expandable applicator;

FIG. 2 is a schematic view of a partially cut-away, partially schematic, view of a buccal, nasopharyngeal, occluded, and expanded applicator;

FIG. 3 is a schematic view of a partially cut-away view of an infusion tube and a piston rod;

FIG. 4 is an enlarged schematic view of the structure of FIG. 2A;

FIG. 5 is an enlarged schematic view of the structure of FIG. 3B;

fig. 6 is a schematic view of the drive mechanism and the expansion mechanism.

[ reference numerals ]

1. A main housing; 2. a sub-shell; 3. a liquid transporting tank; 4. a driving block; 5. a drive spring; 6. a pull rod; 7. a main baffle; 8. a secondary baffle; 9. an infusion tube; 10. a fixed block; 11. a connecting wire; 12. a fixing frame; 13. a rack; 14. a fixed shaft; 15. a liquid inlet pipe; 16. a piston rod; 17. a limiting hole; 18. a U-shaped rod; 19. an atomizing nozzle; 20. a driving groove; 21. a limit rod; 22. a conical block; 23. a limit spring; 24. and (5) installing a block.

While particular structures and devices are shown in the drawings to enable a clear implementation of embodiments of the invention, this is for illustrative purposes only and is not intended to limit the invention to the particular structures, devices and environments, which may be modified or adapted by those of ordinary skill in the art, as desired, and which remain within the scope of the appended claims.

Detailed Description

The present invention provides a buccal nasopharyngeal latch expansion applicator as described in detail below with reference to the drawings and specific examples. While the invention has been described herein in terms of the preferred and preferred embodiments, the following embodiments are intended to be more illustrative, and may be implemented in many alternative ways as will occur to those of skill in the art; and the accompanying drawings are only for the purpose of describing the embodiments more specifically and are not intended to limit the invention specifically.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the relevant art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

Generally, the terminology may be understood, at least in part, from the use of context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending at least in part on the context. In addition, the term "based on" may be understood as not necessarily intended to convey an exclusive set of factors, but may instead, depending at least in part on the context, allow for other factors that are not necessarily explicitly described.

It will be understood that the meanings of "on … …", "over … …" and "over … …" in this disclosure should be interpreted in the broadest sense so that "on … …" means not only "directly on" but also includes meaning "directly on" something with intervening features or layers therebetween, and "over … …" or "over … …" means not only "on" or "over" something, but also may include its meaning "on" or "over" something without intervening features or layers therebetween.

Furthermore, spatially relative terms such as "under …," "under …," "lower," "above …," "upper," and the like may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented and the spatially relative descriptors used herein may similarly be interpreted accordingly.

As shown in fig. 1-6, embodiments of the present invention provide a buccal nasopharyngeal latch expansion applicator comprising: the main shell 1 and the auxiliary shell 2 which are fixedly connected to one side of the outer wall of the main shell 1 through a bolt component, a driving block 4 is rotatably connected to the inside of the main shell 1 and the auxiliary shell 2 through a rotating shaft, an expanding mechanism is used for expanding a wound of a patient, the expanding mechanism is respectively connected with the main shell and the auxiliary shell, a drug delivery mechanism is used for spraying drugs on the wound of the patient, the drug delivery mechanism is respectively connected with the main shell and the auxiliary shell and is positioned below the expanding mechanism, the driving mechanism is used for driving the expanding mechanism and the drug delivery mechanism to operate, the expanding mechanism comprises a main baffle 7 which is arranged inside the main shell 1 and the auxiliary shell 2 and extends to the top of the main shell 1 and the auxiliary shell 2, one end of the outer wall of the main baffle 7 is provided with an auxiliary baffle 8, two sides of the main baffle 7 and the auxiliary baffle 8, which are mutually far from one end, are fixedly connected with a fixed shaft 14, two groups of mounting blocks 24 are symmetrically and fixedly connected to the inner top ends of the main shell 1 and the auxiliary shell 2, the two groups of fixing shafts 14 respectively extend into the two groups of mounting blocks 24, the main baffle 7 and the auxiliary baffle 8 are respectively connected with the main shell 1 and the auxiliary shell 2 in a rotating way through the two groups of fixing shafts 14, when the medicine is required to be applied to a wound position after oral surgery of a patient, the front ends of the main shell 1 and the auxiliary shell 2 extend into the oral cavity of the patient by holding the main shell 1 and the auxiliary shell 2, the main baffle 7 and the auxiliary baffle 8 are positioned below a soft palate, then the two groups of fixing shafts 14 are rotated in opposite directions through the operation of a driving mechanism, the auxiliary baffle 8 and the main baffle 7 are driven to synchronously rotate in opposite directions to expand outwards, the space between the soft palate and a pharyngeal arch and a pharyngeal rear wall is opened, so that the medicine applying mechanism is convenient for applying medicine to the wound surface, and the medicine is effectively applied to the surface of an adenoid body, the risk of postoperative recurrence is reduced by effective alleviation of the drug.

As shown in fig. 1-4 and 6, the edges of the main baffle 7 and the auxiliary baffle 8 are arc-shaped structures, the main baffle 7 and the auxiliary baffle 8 are made of rubber, arc-shaped grooves for the main baffle 7 and the auxiliary baffle 8 to operate are formed in the front ends of the main shell 1 and the auxiliary shell 2, and scratches on soft tissues in the oral cavity of a patient can be avoided when the main baffle 7 and the auxiliary baffle 8 operate through the structure.

As shown in fig. 1-6, the drug delivery mechanism comprises an atomizer 19 fixedly connected inside a main shell 1 and an auxiliary shell 2 and extending to the upper surfaces of the main shell 1 and the auxiliary shell 2, the atomizer 19 is located below a main baffle 7 and an auxiliary baffle 8, the input end of the atomizer 19 is fixedly connected with a transfusion tube 9, a piston rod 16 is movably arranged inside the transfusion tube 9, one end of the outer wall of the piston rod 16 is fixedly connected with a pull rod 6 extending to the outer walls of the main shell 1 and the auxiliary shell 2, the outer wall of the pull rod 6 is sleeved with a driving spring 5, two ends of the pull rod 6 are fixedly connected with the main shell 1 and the driving spring 5 respectively, the top of the transfusion tube 9 is fixedly connected with a liquid inlet tube 15 extending to the upper side of the main shell 1, the liquid inlet tube 15 is mutually communicated with the transfusion tube 9, the top of the liquid inlet tube 15 is connected with a transfusion can 3 through threads, after a space between a soft palate and a pharyngeal arch is opened, the spacing operation of the piston rod 16 is relieved through operating the driving mechanism, the reset action of the driving spring 5 drives the driving spring 5 to move towards the inside the pull rod 6, the pull rod 6 is pushed by the pull rod 6, the pull rod 16 is pushed by the reset action, the piston rod 16 is pushed by the piston rod 16 to move, the liquid medicine can be conveniently and conveniently added into the transfusion tube through the back surface of the liquid medicine tube 9, and the medicine can be filled into the medicine through the transfusion tube through the back tube, and the medicine can be filled into the medicine through the medicine, and the medicine.

As shown in fig. 1-6, the driving mechanism comprises a fixed block 10 fixedly connected to the bottom end inside a main shell 1, a limit spring 23 is arranged inside the fixed block 10, a limit rod 21 is arranged at the top of the limit spring 23, a mounting groove matched with the limit rod 21 is arranged inside the fixed block 10, both the limit rod 21 and the limit spring 23 are positioned inside the mounting groove, the limit rod 21 is movably arranged inside the mounting groove, a driving groove 20 is arranged at the bottom end inside the limit rod 21, a conical block 22 is fixedly connected inside the driving groove 20, a plurality of groups of limit holes 17 extending to the bottom of the piston rod 16 are equidistantly arranged inside the piston rod 16, the upper end of the limit rod 21 is in an inclined surface structure, the inclined surface structure extends to the inside of the limit holes 17, a through hole is arranged on the outer wall of the lower end of the main shell 1, a connecting wire 11 is arranged inside the through hole, the other end of the connecting wire 11 extends to two ends of the internal connecting wire 11 of the driving block 4 and is fixedly connected with a fixing ring, the connecting wire 11 is clamped between the main shell 1 and the driving block 4 through the fixing ring, the outer wall of the limiting rod 21 is fixedly connected with a fixing frame 12, the top of the fixing frame 12 is fixedly connected with a U-shaped rod 18, two ends of the top of the U-shaped rod 18 are symmetrically and fixedly connected with two groups of racks 13, the outer wall of the fixing shaft 14 takes the fixing shaft 14 as a circle center and is fixedly connected with a plurality of groups of clamping teeth, the fixing shaft 14 is meshed with the racks 13 through the clamping teeth, the driving block 4 is buckled to enable the driving block 4 to rotate with a rotating shaft as the circle center, the rotation of the driving block 4 drives the connecting wire 11 to be integrally straightened and downwards presses the conical block 22, the conical block 22 downwards moves and compresses a limiting spring 23, the downwards movement of the conical block 22 drives the limiting rod 21 to downwards move the fixing frame 12 downwards, the fixing frame 12 moves downwards to drive the U-shaped rod 18 to move downwards, the U-shaped rod 18 moves to drive the plurality of groups of racks 13 to move downwards synchronously, the racks 13 move to drive the fixing shaft 14 to rotate through the clamping teeth on the outer wall of the fixing shaft 14, the expansion operation of the wound inside the oral cavity of the patient is completed by driving the expansion mechanism, the operation is performed in the process by continuously buckling the driving block 4, when the limiting rod 21 is completely separated from the limiting hole 17, the expansion of the main baffle 7 and the auxiliary baffle 8 is completed, the limiting operation of the piston rod 16 is released, so that the drug delivery mechanism operates, the drug delivery spraying operation of the wound of the patient is performed, and the drug delivery operation of the gland is completed.

As shown in fig. 2-3 and 5, the middle part of the connecting line 11 penetrates through the driving groove 20 and is located at the top of the conical block 22, the top of the conical block 22 is provided with an arc surface, and the abrasion caused by contact between the middle part of the connecting line 11 and the conical block 22 and the top when the connecting line 11 is straightened to push the conical block 22 to be pressed down can be reduced through the arrangement of the arc surface at the top of the conical block 22, so that the service life of the connecting line 11 is prolonged.

As shown in fig. 6, the inside of the plurality of groups of mounting blocks 24 is respectively provided with accommodating grooves matched with the outer diameters of the plurality of groups of latches, the inside of the mounting blocks 24 is also provided with bar grooves matched with the racks 13, the accommodating grooves are communicated with the bar grooves, and the racks 13 can be provided to move through the arrangement of the bar grooves to drive the plurality of groups of latches to drive the fixed shafts 14 to rotate, so that the driving operation of the main baffle 7 and the auxiliary baffle 8 is completed.

As shown in fig. 5, the fixing block 10 is provided with an installation groove matched with the limit rod, the limit rod 21 and the limit spring 23 are both positioned in the installation groove, the limit rod 1 is slidably connected with the fixing block through the installation groove, and a movable space is provided for the operation of the limit rod 21 and the limit spring 23 through the structure.

As shown in fig. 5, the inside of the infusion tube 9 is provided with a through hole which extends to the bottom of the infusion tube 9 and is matched with the limiting rod 21, the limiting rod 21 penetrates through the through hole to extend to the inside of the limiting hole 17, through the structure, the through between the limiting hole 17 and the outer space of the infusion tube 9 is realized, and then the limiting rod 21 is convenient for carrying out moving limiting operation on the piston rod 16.

According to the technical scheme provided by the invention, when the medicine is required to be administered to the postoperative wound of the oral cavity of a patient, the main shell and the auxiliary shell are held to move, so that the front ends of the main shell and the auxiliary shell extend into the oral cavity of the patient, the main baffle and the auxiliary baffle are positioned below the soft palate, then the two groups of fixed shafts are reversely rotated mutually by operating the driving mechanism, the auxiliary baffle and the main baffle are driven by the reverse rotation of the two groups of fixed shafts to synchronously reversely rotate and outwards expand, and the space between the soft palate, the pharyngopal arch and the pharyngeal rear wall is opened, so that the medicine administration mechanism can conveniently administer medicine to the wound surface and spray the medicine to the surface of an adenoid body, and the risk of postoperative recurrence is reduced by effectively alleviating the medicine.

The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention. In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details. In other instances, well-known methods, procedures, flows, components, circuits, and the like have not been described in detail so as not to unnecessarily obscure aspects of the present invention.

Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the embodiments described above may be implemented by a program that instructs associated hardware, and the program may be stored on a computer readable storage medium, such as: ROM/RAM, magnetic disks, optical disks, etc.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A buccal nasopharyngeal latch expansion applicator comprising: the main shell and the auxiliary shell are fixedly connected to one side of the outer wall of the main shell through a bolt assembly, and a driving block is rotationally connected inside the main shell and the auxiliary shell through a rotating shaft, and the main shell is characterized in that;

the expansion mechanism is used for expanding the wound of the patient and is respectively connected with the main shell and the auxiliary shell;

the drug delivery mechanism is used for spraying drugs on the wound of a patient, is respectively connected with the main shell and the auxiliary shell and is positioned below the expansion mechanism;

a driving mechanism for driving the expanding mechanism and the drug delivery mechanism to operate;

the expansion mechanism comprises a main baffle arranged inside the main shell and the auxiliary shell and extending to the top of the main shell and the top of the auxiliary shell, an auxiliary baffle is arranged at one end of the outer wall of the main baffle, fixing shafts are fixedly connected to two sides of one end, far away from each other, of the main baffle and the auxiliary baffle, two groups of mounting blocks are symmetrically and fixedly connected to the inner top of the main shell and the auxiliary shell, the fixing shafts respectively extend to the two groups of mounting blocks, and the main baffle and the auxiliary baffle are respectively connected with the main shell and the auxiliary shell in a rotating manner through the two groups of fixing shafts.

2. The buccal nasopharyngeal latch expansion applicator of claim 1, wherein edges of said primary baffle and said secondary baffle are provided in an arcuate configuration and wherein said primary baffle and said secondary baffle are rubber, and wherein front ends of said primary shell and said secondary shell are provided with arcuate slots through which said primary baffle and said secondary baffle operate.

3. The buccal type nasopharynx locking and expanding drug delivery device according to claim 1, wherein the drug delivery mechanism comprises an atomizing nozzle fixedly connected inside the main shell and the auxiliary shell and extending to the upper surface of the main shell and the auxiliary shell, the atomizing nozzle is positioned below the main baffle and the auxiliary baffle, an infusion tube is fixedly connected to the input end of the atomizing nozzle, a piston rod is movably arranged inside the infusion tube, a pull rod extending to the outer walls of the main shell and the auxiliary shell is fixedly connected to one end of the outer wall of the piston rod, a driving spring is sleeved on the outer wall of the pull rod, two ends of the pull rod are fixedly connected with the main shell and the driving spring respectively, a liquid inlet tube extending to the upper side of the main shell is fixedly connected to the top of the infusion tube, the liquid inlet tube is mutually communicated with the infusion tube, and an infusion tank is connected to the top of the liquid inlet tube through threads.

4. The buccal nasopharynx locking and expanding drug delivery device according to claim 3, wherein the driving mechanism comprises a fixed block fixedly connected to the bottom end inside the main shell, a limiting spring is arranged inside the fixed block, a limiting rod is arranged at the top of the limiting spring, the limiting rod is movably arranged inside the fixed block, a driving groove is formed in the bottom end inside the limiting rod, conical blocks are fixedly connected inside the driving groove, a plurality of groups of limiting holes extending to the bottom of the piston rod are formed in the piston rod at equal intervals, the upper end of the limiting rod is of an inclined surface structure, the inclined surface structure extends to the inside of the limiting holes, through holes are formed in the outer wall of the lower end of the main shell, connecting wires are arranged inside the through holes, the other ends of the connecting wires extend to the inside of the driving block, fixing rings are fixedly connected to the two ends of the connecting wires, the connecting wires are clamped between the main shell and the driving block through the fixing rings, fixing frames are fixedly connected to the outer walls of the fixing frames, the top of the fixing frames are fixedly connected with U-shaped rods, and the two symmetrical racks are fixedly connected to the two ends of the U-shaped rods.

5. The buccal nasopharyngeal latch expansion applicator of claim 4, wherein said outer wall of said stationary shaft is fixedly connected with a plurality of sets of teeth in a ring shape centered on said stationary shaft, said stationary shaft being intermeshed with said rack by said teeth.

6. The buccal nasopharyngeal latch expansion applicator of claim 4, wherein a central portion of said connecting wire extends through said drive slot, said connecting wire being positioned at a top of said tapered block, said top of said tapered block being configured as an arcuate surface.

7. The buccal nasopharyngeal latch expansion applicator of claim 5, wherein a plurality of sets of said mounting blocks are each provided with a receiving slot therein for mating with a plurality of sets of said latch outer diameters, said mounting blocks being further provided with a bar slot therein for mating with said rack, said receiving slots in communication with said bar slots.

8. The buccal nasopharyngeal latch expansion applicator of claim 4, wherein said fixed block has an interior configured with a mounting slot for mating with said stop lever, said stop lever and stop spring both being positioned within said mounting slot, said stop lever being slidably coupled to said fixed block via said mounting slot.

9. The buccal nasopharyngeal latch expansion applicator of claim 4, wherein said infusion tube is internally provided with a through hole extending to a bottom of said infusion tube and mated with said stop lever, said stop lever extending through said through hole to an interior of said stop hole.