Dual chamber oral delivery device

Abstract

This utility model discloses a dual-chamber mixing drug delivery device for oral cavity use, belonging to the field of medical device technology. The device includes a cylindrical assembly, a push rod assembly, and a drug delivery bend. The cylindrical assembly includes a reservoir and an end cap. The reservoir is divided into two independent drug storage chambers by a partition, and each drug storage chamber has a flow hole at its end. The end cap is detachably connected to the end of the reservoir and forms a mixing chamber inside. The mixing chamber communicates with the drug storage chambers through the flow hole, and the end cap has a liquid outlet. The push rod assembly includes a main push rod, two pistons, and a guide locking mechanism. The pistons are connected to the main push rod through the guide locking mechanism to form an adjustable, independent sliding locking engagement. Each piston can independently slide to adjust its initial position. When the main push rod moves forward, it can simultaneously move the two pistons forward. During use, the two drug solutions are instantly mixed in the mixing chamber of the end cap and then output through the drug delivery bend. This drug delivery device solves the problems of cumbersome operation and poor mixing consistency in existing devices and is suitable for local drug delivery in the periodontal and root canal areas of the oral cavity.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a dual-cavity mixing drug delivery device for oral cavity. Background Technology

[0002] In the local drug treatment of oral diseases such as periodontitis and periapical periodontitis, it is often necessary to mix two medications before injecting them into the periodontal pocket or root canal. However, some medications react upon contact, causing the active ingredients to decompose, making pre-mixing impossible. Therefore, mixing must be performed immediately before administration. Currently, the standard clinical practice is to use two separate sealed containers to store the two medications. When using, one medication is first drawn from the container using a syringe and poured into a mixing dish. The other medication is then drawn in the same way and added. The mixture is then stirred manually and aspirated back using the syringe before being delivered to the affected area for application.

[0003] However, the above-mentioned procedures involve multiple steps such as transferring the medication, manual stirring, and aspiration, which are time-consuming and labor-intensive. Furthermore, the mixing ratio depends on the operator's visual estimation, making it difficult to ensure consistency and affecting the treatment effect. Therefore, there is an urgent need to improve the existing technology. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a dual-chamber oral mixing device to solve the problems of cumbersome operation and poor consistency of the ratio when two medications need to be mixed immediately before use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A dual-cavity mixing and dispensing device for oral use includes a cylindrical assembly, a push rod assembly, and a dispensing bend. The cylindrical assembly includes a reservoir and an end cap. The reservoir has an internal partition that completely divides the internal cavity into two independent drug storage chambers. Each drug storage chamber has a flow hole at its end. The end cap is detachably connected to the end of the reservoir with the flow hole. The end cap has a mixing chamber inside, which communicates with the corresponding drug storage chambers through the two flow holes. The end cap also has... The device is provided with a liquid outlet communicating with the mixing chamber, and the drug delivery bend is detachably connected to the liquid outlet; the push rod assembly includes a main push rod, two pistons respectively slidably disposed in the two drug storage chambers, and a guide locking mechanism. The two pistons are connected to the main push rod through the guide locking mechanism to form an adjustable independent sliding locking engagement. Each piston can slide independently to adjust its initial position in the corresponding drug storage chamber, and when the main push rod moves forward, it can move the two pistons forward synchronously through the guide locking mechanism.

[0006] Preferably, the guide locking mechanism includes two parallel guide rails disposed on the main push rod, the guide rails having guide grooves, each piston being fixedly connected to a guide rod, the guide rods being inserted into the guide grooves and being able to slide along the guide grooves.

[0007] Preferably, the guide groove is a rectangular groove, and the guide rod has an I-shaped cross-section, wherein the guide rod is limited and slidably engaged with the rectangular groove through the I-shaped cross-section.

[0008] Preferably, the end of the guide rod away from the piston has a protruding handle.

[0009] Preferably, the outer wall of the liquid storage cylinder is provided with scale lines, and the scale lines are respectively provided for the two drug storage chambers.

[0010] Preferably, the outer wall of the end of the liquid storage cylinder with the flow hole is provided with an external thread, and the inner wall of the end cap is provided with an internal thread. The end cap and the liquid storage cylinder are detachably connected through the external thread and the internal thread.

[0011] Preferably, one end of the drug-feeding bend is provided with a standard connector, and the drug-feeding bend is detachably connected to the liquid outlet through the standard connector.

[0012] This invention discloses a dual-chamber oral medication dispenser, the core of which lies in dividing the reservoir into two independent storage chambers via a partition, enabling separate storage of two different medications; the mixing chamber inside the end cap ensures that the two medications are mixed just before dispensing, avoiding premature mixing and drug inactivation; and a guide locking mechanism allows for independent adjustment of the initial positions of the two pistons, enabling the setting of the dispensing ratio of the two medications as needed. Compared to existing technologies, this invention offers significant advantages: the dispenser integrates medication storage, ratio adjustment, instant mixing, and administration functions into one unit; a single push completes the simultaneous extrusion, mixing, and delivery of the two medications, eliminating the need for multiple transfers and manual stirring, greatly simplifying the operation process and saving treatment preparation time; the initial positions of the two pistons can be independently adjusted and locked according to clinical needs, ensuring flexibility and consistency in ratio adjustment for different patients and different degrees of inflammation; the medications are mixed within the closed mixing chamber, avoiding the risk of contamination from open operation and reducing waste due to medication residue on the container walls. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the oral dual-cavity mixing drug delivery device of this utility model.

[0014] Figure 2 This is a partial cross-sectional schematic diagram of the oral dual-cavity mixing drug delivery device of this utility model.

[0015] Figure 3 This is a cross-sectional schematic diagram of the oral dual-cavity mixing drug delivery device of this utility model.

[0016] Figure 4 This is an exploded structural diagram of the oral dual-cavity mixing drug delivery device of this utility model.

[0017] Figure 5 This is a schematic diagram of the push rod assembly in the oral dual-cavity mixing drug delivery device of this utility model.

[0018] The following are the markings in the attached diagram: 1. Liquid reservoir; 11. Baffle; 12. Drug storage chamber; 13. Flow hole; 14. Scale line; 2. End cap; 21. Mixing chamber; 22. Liquid outlet; 3. Main push rod; 31. Guide rail; 32. Guide groove; 4. Piston; 41. Guide rod; 42. Protruding handle; 6. Drug delivery bend; 61. Standard connector. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the local drug treatment of oral diseases such as periodontitis and periapical periodontitis, some drug solutions react upon contact, causing the active ingredients to decompose, making pre-mixing impossible. Therefore, mixing must be completed immediately before administration. Existing methods involve multiple drug transfers, manual stirring, and back-aspiration steps, which are time-consuming and make it difficult to ensure consistent proportions. Based on this, this application provides an oral dual-chamber mixing and administration device, see [link to details]. Figure 1 The drug delivery device mainly consists of three parts: the cylinder assembly, the push rod assembly, and the drug delivery bend tube 6.

[0022] The cylinder assembly includes a liquid storage cylinder 1 and an end cap 2. A partition 11 is disposed inside the liquid storage cylinder 1, extending axially along the cylinder 1 and dividing the internal cavity into two isolated drug storage chambers 12. Each drug storage chamber 12 has a flow hole 13 on its front end wall. Figure 2 and Figure 3 The front outer side of the liquid storage cylinder 1 is machined with external threads, and the inner side of the end cap 2 is correspondingly machined with internal threads. The end cap 2 is screwed onto the front end of the liquid storage cylinder 1. An internal cavity is provided in the end cap 2, which is the mixing chamber 21. When the end cap 2 is tightened, the mixing chamber 21 is connected to the two drug storage chambers 12 through two flow holes 13. An outlet 22 is provided at the center of the front face of the end cap 2, through which the liquid medicine in the mixing chamber 21 can flow out. The drug delivery bend 6 is detachably inserted into the outlet 22 via a standard connector 61 at its end. The curved body of the drug delivery bend 6 facilitates insertion deep into the oral cavity.

[0023] The push rod assembly is located at the rear end of the liquid storage cylinder 1. The main push rod 3 is located behind the liquid storage cylinder 1, and two pistons 4 are inserted into the two drug storage chambers 12 from the rear end of the liquid storage cylinder 1, respectively. A sliding seal is formed between the outer peripheral wall of the piston 4 and the inner wall of the drug storage chamber 12. The two pistons 4 are connected to the main push rod 3 through a guide locking mechanism. For details, see [link to details]. Figure 5 Two parallel guide rails 31 are fixed on the main push rod 3, and each guide rail 31 has a guide groove 32 along its length. A guide rod 41 is fixedly connected to the rear end face of each piston 4. The guide rod 41 extends forward and inserts into the corresponding guide groove 32, and the guide rod 41 can slide freely along the guide groove 32. In this structure, the operator can push a single guide rod 41 to move the corresponding piston 4 in its medicine storage chamber 12, thereby adjusting the liquid volume of the chamber. When the main push rod 3 is pushed forward, the guide rail 31 moves forward accordingly, and the side wall of the guide groove 32 pushes against the guide rod 41, thereby driving the two pistons 4 to move forward synchronously, squeezing out the liquid from both chambers at the same time.

[0024] like Figure 3 As shown, the mixing chamber 21 inside the end cap 2 is located between the two flow holes 13 and the outlet 22. During injection, the two medications enter the mixing chamber 21 from their respective storage chambers 12 through the flow holes 13, merge in the mixing chamber 21, and are discharged through the outlet 22. The mixing chamber 21 has a certain volume, and the medications are mixed within a short period of time.

[0025] When using this medication applicator clinically, the operator first unscrews the end cap 2, exposing the two flow holes 13 at the front end of the reservoir 1. After determining the ratio of the two medications according to the patient's periodontal inflammation, the operator holds the two protruding handles 42 and pushes the guide rod 41 to slide along the guide groove 32, causing the two pistons 4 to move back and forth within their respective drug storage chambers 12. Refer to the graduation lines 14 on the outer wall of the reservoir 1 (see...). Figure 1and Figure 2 The system can accurately read the volume of medication in each storage chamber 12. After setting the mixing ratio, tighten the end cap 2 and then insert the medication delivery tube 6 into the outlet 22. Insert the free end of the medication delivery tube 6 into the patient's mouth and reach the affected area. Push the main push rod 3 forward, and the two pistons 4 move forward simultaneously. The two medications enter the mixing chamber 21 through the flow hole 13 and mix. Then, they are output to the periodontal pocket or root canal through the outlet 22 and the medication delivery tube 6.

[0026] Throughout the entire procedure, the operator only needs to inject once to simultaneously extrude, mix, and deliver the two medications, eliminating the need for multiple transfers and manual stirring, thus reducing treatment preparation time. Because the ratio of the two medications is controlled by a mechanical setting of the piston's initial position, consistency between different operators is ensured. The entire mixing process is completed within a closed chamber, eliminating the risk of contamination associated with open operations.

[0027] The present invention further proposes that the guide locking mechanism includes two parallel guide rails 31 disposed on the main push rod 3, and guide grooves 32 are provided on the guide rails 31. Each piston 4 is fixedly connected to a guide rod 41, which is inserted into the guide groove 32 and can slide along the guide groove 32.

[0028] Specifically, the two guide rails 31 are integrally formed or fixedly connected to the main push rod 3, and move synchronously with the main push rod 3. The guide groove 32 is provided through the guide rail 31 along its length. One end of the guide rod 41 is fixed to the rear end face of the piston 4, and the other end is embedded in the guide groove 32. The guide rod 41 and the guide groove 32 are clearance-fitted to ensure smooth sliding of the guide rod 41. The core function of this structure is that during the proportioning adjustment stage, the guide rod 41 slides freely in the guide groove 32 without interfering with the independent adjustment of the piston 4; while during the injection stage, the guide groove 32 and the guide rod 41 form a preliminary lock, transmitting the thrust of the main push rod 3 to the piston 4.

[0029] In this embodiment, the two states of independent sliding and synchronous locking are achieved through the same set of guide rail-guide rod mechanism, which is compact in structure, requires no additional clutch or switching device, and is easy to operate.

[0030] The present invention further proposes that the guide groove 32 is a rectangular groove, and the guide rod 41 has an I-shaped cross section. The guide rod 41 is limited and slidably engaged with the rectangular groove through the I-shaped cross section.

[0031] In detail, the rectangular groove has a rectangular cross-section, with the groove opening width being smaller than the groove bottom width. The guide rod 41 has an I-shaped cross-section with an upper flange, a lower flange, and a central web. The upper flange is located outside the groove opening, the lower flange is located inside the groove bottom, and the web passes through the groove opening. This cross-sectional shape confines the guide rod 41 within the guide groove 32, allowing it to move only along the length of the groove, while it is restricted in the direction perpendicular to the groove, preventing it from detaching from the groove opening.

[0032] The limiting sliding fit ensures that the connection between the guide rod 41 and the guide rail 31 will not disengage under force, and the force transmission during the injection process is reliable. The machining technology for rectangular grooves and I-shaped cross-sections is mature, and the manufacturing cost is controllable.

[0033] The present invention further proposes that the end of the guide rod 41 away from the piston 4 is provided with a protruding handle 42.

[0034] A raised handle 42 is fixed to the rear end of the guide rod 41 and protrudes outward from the surface of the guide rod 41. The operator can push or pull the guide rod 41 by pinching the raised handle 42 with their fingers, without the need for tools. This design makes the proportioning adjustment operation more convenient, especially when the operator is wearing medical gloves, as the raised handle 42 provides a reliable point of force application, which is conducive to fine adjustment.

[0035] The present invention further proposes that a scale line 14 is provided on the outer wall of the liquid storage cylinder 1, and the scale line 14 is respectively provided for the two drug storage chambers 12.

[0036] Specifically, graduation lines 14 are printed or etched along the axial direction on the outer wall surface of the liquid storage cylinder 1. Since the two drug storage chambers 12 are arranged side by side, the graduation lines 14 are also divided into two groups, which are marked on the outer wall areas corresponding to the two drug storage chambers 12 respectively. Each group of graduation lines 14 indicates the change in the contents of the corresponding drug storage chamber 12.

[0037] The operator can read the volume of the medicine by observing the scale value corresponding to the rear end face of piston 4. Compared with estimating by relying on the scale on the syringe, this integrated design that directly reads the volume of the medicine reservoir reduces the sources of error in the reading process.

[0038] The present invention further proposes that the outer wall of the end of the liquid storage cylinder 1 with the flow hole 13 is provided with an external thread, and the inner wall of the end cap 2 is provided with an internal thread. The end cap 2 and the liquid storage cylinder 1 are detachably connected through the external thread and the internal thread.

[0039] The end cap 2 and the reservoir 1 are connected by a threaded connection, which offers the advantage of a stable connection and allows for repeated disassembly and assembly. After tightening, a sealing gasket can be placed between the end cap 2 and the front end face of the reservoir 1 to prevent leakage of the medication from the connection gap. After disassembly, the two flow holes 13 at the front end of the reservoir 1 are fully exposed, facilitating the aspiration of the medication by pushing and pulling the piston 4. The threaded connection is simple to operate, and clinical medical staff can master the disassembly and assembly methods without additional training.

[0040] This utility model further proposes, see [reference] Figure 4 One end of the drug delivery bend 6 is provided with a standard connector 61, and the drug delivery bend 6 is detachably connected to the liquid outlet 22 through the standard connector 61.

[0041] The standard connector 61 is shaped to fit the inner bore of the outlet 22. The plug-in connection allows for quick connection and disconnection. The tube body of the medication delivery bend 6 is made of flexible or semi-rigid material and has a certain bending angle to facilitate access to the bottom of the periodontal pocket by bypassing teeth and gingival tissue.

[0042] Because the medication delivery bend 6 is detachable, the same delivery device can be equipped with medication delivery bends 6 of various bending angles or different lengths, allowing the operator to select the appropriate one based on the specific treatment site. After a single use, the medication delivery bend 6 can be disassembled and replaced, and the reservoir 1 and push rod assembly can be reused after sterilization, reducing consumable costs.

[0043] When using this medication applicator, the operator first unscrews the end cap 2, exposing the two flow holes 13 at the front end of the reservoir 1. According to the required dosage, the operator holds the two protruding handles 42 and pushes the corresponding guide rods 41 along the guide grooves 32, moving the two pistons 4 to the desired positions within their respective drug storage chambers 12. The operator then confirms the amount of medication inhaled by referring to the scale lines 14 on the outer wall of the reservoir 1 corresponding to the drug storage chamber 12. The end cap 2 is then screwed tightly onto the front end of the reservoir 1. The standard connector 61 of the medication delivery bend 6 is inserted into the outlet 22 of the end cap 2 and secured. The free end of the medication delivery bend 6 is inserted into the patient's mouth and aligned with the affected area. The operator pushes the main push rod 3 forward, causing the two guide rails 31 to move forward synchronously. The guide grooves 32 on the guide rails 31 push the guide rods 41, thereby causing the two pistons 4 to move forward synchronously within their respective drug storage chambers 12. The medication in the two storage chambers 12 is squeezed out through their respective flow holes 13 and flows into the mixing chamber 21 inside the end cap 2 for thorough mixing. The mixed medication then flows into the medication application bend 6 through the outlet 22 and is finally output from the free end of the bend to the periodontal pocket or root canal, completing the medication application. The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-cavity mixing drug delivery device for oral use, characterized in that, Including the cylinder assembly, push rod assembly and drug delivery bend (6); The cylindrical assembly includes a liquid storage cylinder (1) and an end cap (2). The liquid storage cylinder (1) is provided with a partition (11) inside. The partition (11) completely divides the internal cavity of the liquid storage cylinder (1) into two independent drug storage chambers (12). Each drug storage chamber (12) has a flow hole (13) at its end. The end cap (2) is detachably connected to one end of the liquid storage cylinder (1) where the flow hole (13) is provided. A mixing chamber (21) is formed inside the end cap (2). The mixing chamber (21) is connected to the corresponding drug storage chamber (12) through the two flow holes (13). The end cap (2) is also provided with an outlet (22) connected to the mixing chamber (21). The drug delivery bend (6) is detachably connected to the outlet (22). The push rod assembly includes a main push rod (3), two pistons (4) that are slidably disposed in the two drug storage chambers (12) respectively, and a guide locking mechanism. The two pistons (4) are connected to the main push rod (3) through the guide locking mechanism to form an adjustable independent sliding locking engagement. Each piston (4) can slide independently to adjust its initial position in the corresponding drug storage chamber (12), and when the main push rod (3) moves forward, it can move forward synchronously with the two pistons (4) through the guide locking mechanism.

2. The oral dual-cavity mixing drug delivery device according to claim 1, characterized in that: The guide locking mechanism includes two parallel guide rails (31) set on the main push rod (3). The guide rails (31) are provided with guide grooves (32). Each piston (4) is fixedly connected with a guide rod (41). The guide rod (41) is inserted into the guide groove (32) and can slide along the guide groove (32).

3. The oral dual-cavity mixing drug delivery device according to claim 2, characterized in that: The guide groove (32) is a rectangular groove, and the guide rod (41) has an I-shaped cross section. The guide rod (41) is in a limited sliding fit with the rectangular groove through the I-shaped cross section.

4. The oral dual-cavity mixing drug delivery device according to claim 2, characterized in that: The guide rod (41) has a protruding handle (42) at the end away from the piston (4).

5. The oral dual-cavity mixing drug delivery device according to claim 1, characterized in that: The outer wall of the liquid storage cylinder (1) is provided with scale lines (14), and the scale lines (14) are respectively set for the two drug storage chambers (12).

6. The oral dual-cavity mixing drug delivery device according to claim 1, characterized in that: The outer wall of the end of the liquid storage cylinder (1) with the flow hole (13) is provided with an external thread, and the inner wall of the end cap (2) is provided with an internal thread. The end cap (2) and the liquid storage cylinder (1) are detachably connected through the external thread and the internal thread.

7. The oral dual-cavity mixing drug delivery device according to claim 1, characterized in that: One end of the medicine-feeding bend (6) is provided with a standard connector (61), and the medicine-feeding bend (6) is detachably connected to the liquid outlet (22) through the standard connector (61).

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