A bolus nebulizer

Abstract

This invention provides a push-type nebulizer for drug delivery, comprising a reservoir, a rebound mechanism, and a liquid guide tube. The reservoir contains a piston and a push rod, and a connector structure is located at the front end of the reservoir. The rebound mechanism includes a fixed sleeve and a valve core. The fixed sleeve is installed on the connector structure, and its axial position relative to the connector structure port is adjustable. A guide ring is provided inside the fixed sleeve, and channels for drug flow are provided on the inner walls of the guide ring and the fixed sleeve. The valve core is movably mounted on the guide ring and has a sealing plate that seals the opening of the connector structure. A spring is fitted onto the valve core. The liquid guide tube is installed on the second connector of the fixed sleeve. In this invention, the rebound mechanism allows the sealing plate to quickly rebound and reset under the spring force the instant the drug delivery stops, drawing back the drug in the liquid guide tube and effectively solving the problem of dripping from the spray head during drug delivery.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, and in particular relates to a push-type nebulizer for drug delivery. Background Technology

[0002] A drug delivery device is a medical device currently used in clinical practice. A common structure for drug delivery devices includes a reservoir, a piston and a push rod inside the reservoir, a guide tube at the front end of the reservoir, and a spray head at the front end of the guide tube. In use, the medication is injected into the reservoir, and the push rod pushes the piston forward. The medication in the reservoir is then atomized and sprayed directly to the affected area through the spray head, shortening the treatment time.

[0003] However, clinical observations have shown that once the medication delivery stops, dripping occurs at the spray nozzle of the applicator, affecting nebulization. To address this issue, healthcare professionals typically push the plunger back immediately after stopping the delivery to retract the medication. This method resolves the dripping problem when the applicator stops delivering medication, but it is inconvenient. Utility Model Content

[0004] In view of this, the present invention aims to propose a push-type nebulizer for drug delivery, which can automatically draw back the drug solution when the drug delivery device stops, thus solving the problem of dripping from the spray head.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A push-type nebulizer includes a liquid reservoir, a rebound mechanism, and a liquid guide tube;

[0007] The liquid storage cylinder is equipped with a piston and a push rod. The push rod extends from the rear end of the liquid storage cylinder, and a joint structure is provided at the front end of the liquid storage cylinder.

[0008] The rebound mechanism includes a fixed sleeve and a valve core. The fixed sleeve is installed on the connector structure of the liquid storage cylinder, and the position of the fixed sleeve relative to the port of the connector structure in the axial direction is adjustable. A second connector is provided at the front end of the fixed sleeve, and a guide ring is provided inside the fixed sleeve. The guide ring and the inner wall of the fixed sleeve have channels for the flow of the liquid medicine. The valve core is movably installed through the guide ring. A sealing plate is provided at one end of the valve core facing the connector structure. The sealing plate seals the opening of the connector structure. A spring is installed in the valve core. One end of the spring abuts against the sealing plate and the other end abuts against the guide ring.

[0009] The liquid guide tube is installed on the second connector of the fixed sleeve.

[0010] Furthermore, the connector structure includes a first connector and a movable sleeve. The first connector is disposed at the front end of the liquid storage cylinder. The rear end of the movable sleeve and the first connector, and the front end of the movable sleeve and the rear end of the fixed sleeve are respectively matched with threaded connection structures, so that the rear end of the movable sleeve is threadedly connected to the first connector and the front end of the movable sleeve is threadedly connected to the fixed sleeve. A sealing structure is respectively provided between the movable sleeve and the first connector, and between the movable sleeve and the fixed sleeve.

[0011] The sealing plate blocks the front port of the center hole of the movable sleeve.

[0012] Furthermore, the threads of the rear end of the movable sleeve that adapt to the first connector and the threads of the front end that adapt to the fixed sleeve have the same direction of rotation.

[0013] Furthermore, the first connector has an annular cavity formed around its central hole;

[0014] The threads connecting the movable sleeve to the first connector and the threads connecting the movable sleeve to the fixed sleeve are respectively set on the outer circumferential surface of the movable sleeve. The rear end of the movable sleeve is inserted into the annular cavity and threadedly connected to the outer ring wall of the annular cavity. The front end of the movable sleeve is inserted into the fixed sleeve and threadedly connected to the inner wall of the fixed sleeve. The corresponding thread setting position of the fixed sleeve is left with a distance from the rear end of the fixed sleeve. The inner wall of the fixed sleeve is sealed between the movable sleeve and the fixed sleeve at this distance position, and the inner wall of the movable sleeve is sealed with sealing rings between the inner wall of the fixed sleeve and the inner ring wall of the annular cavity.

[0015] Furthermore, the guide ring is fixed by radially arranged ribs and the inner wall of the fixing sleeve.

[0016] Furthermore, a positioning ring is provided at one end of the guide ring facing the rear port of the fixed sleeve, and the spring is inserted into the positioning ring.

[0017] Furthermore, the front end of the liquid guide tube is provided with a spray head.

[0018] Furthermore, the liquid guide tube is a flexible tube, and a guide wire is embedded inside the liquid guide tube.

[0019] Compared with the prior art, the push-type nebulizer of this utility model has the following advantages:

[0020] (1) In this utility model, a rebound mechanism is set between the liquid guide tube and the liquid storage cylinder. At the moment when the liquid stops being pushed, the liquid pressure decreases. The sealing plate of the rebound mechanism rebounds and resets quickly under the action of the spring force. The liquid in the joint structure flows back and impacts the piston, causing the piston in the liquid storage cylinder to move back and automatically draw back the liquid in the liquid guide tube, thus solving the problem of the spray head dripping when the liquid stops being pushed.

[0021] (2) In this utility model, the position of the axially fixed sleeve relative to the joint structure can be adjusted to adjust the pre-pressure applied by the spring to the valve core. Therefore, the pre-pressure of the spring can be adjusted according to the specific liquid, so as to meet the atomization delivery requirements of different liquids and improve the versatility of this utility model. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a perspective view of the drug delivery device described in an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the drug delivery device according to an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of the springback mechanism in this embodiment;

[0026] Figure 4 This is a perspective view of the fixed sleeve in this embodiment;

[0027] Figure 5 This is the main view of the fixed sleeve in this embodiment;

[0028] Figure 6 for Figure 5 AA view;

[0029] Figure 7 This is a cross-sectional view of the active housing in this embodiment.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Push rod; 2-Liquid reservoir; 21-First connector; 22-Annular cavity; 3-Rebound mechanism; 4-Liquid guide tube; 5-Spray head; 6-Modible sleeve; 61-First mounting hole; 62-Second mounting hole; 63-Sealing groove; 64-Center hole of movable sleeve; 65-Sealing surface; 7-Spring; 8-Valve core; 81-Sealing plate; 9-Fixed sleeve; 91-Second connector; 92-Guide ring; 93-Rib; 95-Positioning ring; 96-Internal thread; 97-Sealing part; 10-Piston; 11-Guide wire; 12-Sealing ring. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1 , Figure 2As shown, a push-type nebulizer includes a reservoir 2, a rebound mechanism 3, and a liquid guide tube 4. A piston 10 is fitted inside the reservoir 2, and a push rod 1 is mounted on the piston 10, extending from the rear end of the reservoir 2. A connector structure is provided at the front end of the reservoir 2. The rebound mechanism 3 connects the reservoir 2 and the liquid guide tube 4, and a spray head 5 is provided at the front end of the liquid guide tube 4. The liquid guide tube 4 is preferably a flexible tube, and a guide wire 11 is embedded within it. The liquid guide tube can be shaped according to the physiological structure of the drug delivery site, making its shape adaptable to the human body and improving the comfort of the liquid guide tube entering the body.

[0034] springback mechanism 3 Figure 3 As shown, the connector structure includes a fixed sleeve 9 and a valve core 8. The fixed sleeve 9 is installed on the connector of the liquid storage cylinder 2. The connector structure includes a first connector 21 and a movable sleeve 6. The first connector 21 is located at the front end of the liquid storage cylinder 2, and the movable sleeve 6 is installed at the front end of the first connector 21. The front port of the center hole of the movable sleeve is the opening of the connector structure. The fixed sleeve 9 is installed at the front end of the movable sleeve 6. The specific connection structure is as follows:

[0035] The rear end of the movable sleeve 6 and the first connector 21, and the front end of the movable sleeve 6 and the rear end of the fixed sleeve 9 are respectively fitted with threaded connection structures, so that the rear end of the movable sleeve 6 is threaded to the first connector 21 and the front end of the movable sleeve 6 is threaded to the fixed sleeve 9. The movable sleeve 6 and the first connector 21, and the movable sleeve 6 and the fixed sleeve 9 are respectively sealed by sealing rings 12. This connection structure allows the position of the fixed sleeve 9 relative to the movable sleeve 6 to be adjusted in the axial direction.

[0036] A second connector 91 is provided at the front end of the fixed sleeve 9, and the liquid guide tube 4 is installed on the second connector 91 of the fixed sleeve 9. A guide ring 92 is provided inside the fixed sleeve 9, and a channel for the flow of liquid medicine is left between the guide ring 92 and the inner wall of the fixed sleeve 9. The valve core 8 is movably installed on the guide ring 92. A sealing plate 81 is provided at one end of the valve core 8 facing the movable sleeve 6. A spring 7 is installed on the valve core 8. One end of the spring 7 abuts against the sealing plate 81 and the other end abuts against the guide ring 92. Under the action of the spring 7, the sealing plate 81 seals the front port of the center hole of the movable sleeve.

[0037] Fixed sleeve 9 structure as follows Figure 4 , Figure 5 , Figure 6 As shown, the guide ring 92 is located inside the fixed sleeve 9 and near the front end of the fixed sleeve 9. The guide ring 92 and the fixed sleeve 9 are coaxial and are connected and fixed to the inner wall of the fixed sleeve 9 by radially arranged ribs 93. A positioning ring 95 protrudes from the rear end face of the guide ring 92, i.e., the end face facing the rear port of the fixed sleeve 9. The positioning ring 95 and the guide ring 92 are coaxial, and the inner diameter of the positioning ring 95 corresponds to the diameter of the spring 7. See reference. Figure 3The front end of the spring 7 is inserted into the positioning ring 95 and abuts against the rear end face of the guide ring 92. The inner wall of the fixed sleeve 9 is provided with an internal thread 96 at a certain distance from its rear port, and the part between the internal thread 96 and the rear port of the fixed sleeve 9 is a smooth hole structure, which is the sealing part 97 of the fixed sleeve 9.

[0038] The specific structure of the 6-piece activity set is as follows: Figure 7 As shown, the threads connecting the movable sleeve 6 to the first connector 21 and the threads connecting the movable sleeve 6 to the fixed sleeve 9 are respectively provided on the outer circumferential surface of the movable sleeve 6. The front end of the central hole 64 of the movable sleeve has a first mounting hole portion 61, and the rear end has a second mounting hole portion 62. The diameters of both the first mounting hole portion 61 and the second mounting hole portion 62 are larger than the diameter of the central hole 64 of the movable sleeve. A sealing surface 65 is formed at the connection point between the first mounting hole portion 61 and the central hole 64 of the movable sleeve. (See reference...) Figure 3 The sealing plate 81 is located inside the first mounting hole 61 and abuts against the sealing surface 65. The spring 7 presses the sealing plate 81 tightly, and the sealing plate 81 seals the front end of the center hole 64 of the movable sleeve to prevent leakage of the medicine injected into the medicine storage cylinder 2 before the medicine is pushed. A sealing groove 63 for installing the sealing ring 12 is opened on the outer circumferential surface of the movable sleeve 6 at the position behind the thread that connects to the fixed sleeve 9. A sealing groove 63 for installing the sealing ring 12 is also opened on the hole wall of the second mounting hole 62.

[0039] In this invention, an annular cavity 22 is formed around the central hole on the front end face of the first connector 21, and a corresponding movable sleeve 6 is provided in the annular cavity 22. The outer ring wall of the annular cavity 22 is provided with an internal thread corresponding to the movable sleeve 6. During assembly, the rear end of the movable sleeve 6 is inserted into the annular cavity 22 and threadedly connected to the outer ring wall of the annular cavity 22; the front end of the movable sleeve 6 is inserted into the fixed sleeve 9 and threadedly connected to the internal thread 96 of the fixed sleeve 9. The sealing part 97 of the fixed sleeve 9 and the outer circumferential surface of the movable sleeve 6, and the second mounting hole 62 of the movable sleeve 6 and the inner ring wall of the annular cavity 22 are sealed by sealing rings 12 respectively.

[0040] The working principle of this utility model is as follows: Spring 7 applies pre-pressure to sealing plate 81, enabling sealing plate 81 to seal the front port of the central hole of the movable sleeve, thereby sealing the liquid injected into the storage cylinder 2. When push rod 1 is pushed to move piston 10 forward and pressurize the liquid in storage cylinder 2, the increased liquid pressure pushes open sealing plate 81, and the liquid flows through fixed sleeve 9 and then into liquid guide tube 4, and finally is atomized and sprayed out by spray head 5. When the liquid stops being pushed, spring 7 rebounds, causing sealing plate 81 to quickly return to its original position. The rapid return of sealing plate 81 pushes the liquid stored in the central hole 64 of movable sleeve and first connector 21 to flow to storage cylinder 2, pushing piston 10 back. The return of piston 10 draws back the liquid in liquid guide tube 4, preventing dripping at spray head and solving the problem of dripping at spray head.

[0041] In this invention, the fixed sleeve 9 and the movable sleeve 6 are connected by threads. The axial relative position of the fixed sleeve 9 and the movable sleeve 6 is adjusted by adjusting the length of the threaded connection, which in turn adjusts the position of the front end of the center hole 64 of the movable sleeve, thereby adjusting the preload of the spring 7. This allows for adjustment of the preload of the spring 7 according to different medications. For example, for high-concentration medications, due to their higher viscosity, the preload of the spring 7 can be increased to increase the spring's rebound force, pushing the medication back and thus pushing the piston back to draw the medication back from the guide tube, preventing dripping. Conversely, for low-concentration medications with lower viscosity, the preload of the spring 7 can be decreased. Adjusting the spring preload can meet the needs of atomizing different medications, preventing dripping from the spray head when the medication stops being pushed, and improving the versatility of this invention.

[0042] Preferably, the threads of the movable sleeve 6 that adapt to the first connector 21 at the rear end and the fixed sleeve 9 at the front end have the same thread direction and the same thread helix angle. This structure facilitates the thread machining of the movable sleeve. Furthermore, when adjustment is needed, by holding the reservoir 2 and the fixed sleeve 9 and rotating the movable sleeve 6, the threaded connection length between it and the fixed sleeve 9 can be adjusted, thereby adjusting the prestress of the spring 7. This adjustment method ensures that the total length of the pusher remains constant. It should be noted that the threaded connection lengths between the movable sleeve 6 and the first connector 21, and between the movable sleeve 6 and the fixed sleeve, can also be adjusted independently. The specific adjustment method can be determined by the medical staff and does not need to be limited.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A push-type nebulizer for drug delivery, characterized in that: It includes a liquid storage cylinder (2), a rebound mechanism (3), and a liquid guide tube (4); The liquid storage cylinder (2) is equipped with a piston (10) and a push rod (1). The push rod (1) extends from the rear end of the liquid storage cylinder (2), and a joint structure is provided at the front end of the liquid storage cylinder (2). The rebound mechanism (3) includes a fixed sleeve (9) and a valve core (8). The fixed sleeve (9) is installed on the joint structure of the liquid storage cylinder (2), and the position of the fixed sleeve (9) relative to the port of the joint structure in the axial direction is adjustable. A second joint (91) is provided at the front end of the fixed sleeve (9). A guide ring (92) is provided inside the fixed sleeve (9). The guide ring (92) and the inner wall of the fixed sleeve (9) have a channel for the flow of the liquid medicine. The valve core (8) is movably installed on the guide ring (92). A sealing plate (81) is provided at one end of the valve core (8) facing the joint structure. The sealing plate (81) seals the opening of the joint structure. A spring (7) is installed on the valve core (8). One end of the spring (7) abuts against the sealing plate (81) and the other end abuts against the guide ring (92). The liquid guide tube (4) is installed on the second connector (91) of the fixed sleeve (9).

2. The push-type nebulizer according to claim 1, characterized in that: The connector structure includes a first connector (21) and a movable sleeve (6). The first connector (21) is located at the front end of the liquid storage cylinder (2). The rear end of the movable sleeve (6) and the first connector (21) are respectively matched with threaded connection structures, and the front end of the movable sleeve (6) and the rear end of the fixed sleeve (9) are respectively matched with threaded connection structures, so that the rear end of the movable sleeve (6) is threadedly connected to the first connector (21) and the front end of the movable sleeve (6) is threadedly connected to the fixed sleeve (9). A sealing structure is respectively provided between the movable sleeve (6) and the first connector (21) and between the movable sleeve (6) and the fixed sleeve (9). The sealing plate (81) blocks the front port of the center hole (64) of the movable sleeve.

3. The push-type nebulizer according to claim 2, characterized in that: The threads of the movable sleeve (6) that adapt to the first connector (21) at the rear end and the threads of the fixed sleeve (9) at the front end have the same direction of rotation.

4. A push-type nebulizer according to claim 2, characterized in that: The first connector (21) has an annular cavity (22) around its central hole; The threads connecting the movable sleeve (6) to the first connector (21) and the threads connecting the movable sleeve (6) to the fixed sleeve (9) are respectively set on the outer circumferential surface of the movable sleeve (6). The rear end of the movable sleeve (6) is inserted into the annular cavity (22) and threadedly connected to the outer ring wall of the annular cavity (22). The front end of the movable sleeve (6) is inserted into the fixed sleeve (9) and threadedly connected to the inner wall of the fixed sleeve (9). The corresponding thread setting position of the fixed sleeve (9) is left with a distance from the rear end of the fixed sleeve. The inner wall of the fixed sleeve (9) is sealed between the movable sleeve (6) and the inner wall of the movable sleeve (6) and the inner ring wall of the annular cavity (22) respectively by sealing rings (12).

5. A push-type nebulizer according to claim 1, characterized in that: The guide ring (92) is fixed by radially arranged stiffeners (93) and the inner wall of the fixing sleeve (9).

6. A push-type nebulizer according to claim 1, characterized in that: The guide ring (92) is positioned with a positioning ring (95) corresponding to the spring (7) at one end facing the rear port of the fixed sleeve (9), and the spring (7) is inserted into the positioning ring (95).

7. The push-type nebulizer according to claim 1, characterized in that: The front end of the liquid guide tube (4) is provided with a spray head (5).

8. A push-type nebulizer according to claim 1, characterized in that: The liquid guide tube (4) is a flexible tube, and a guide wire (11) is embedded inside the liquid guide tube (4).

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