A device for dispensing fluid.

Abstract

This invention relates to the field of medical device technology and discloses a device for dispensing fluid, including an outer cylinder, a push rod, an elastic storage device, a first release structure, a second release structure, and a third release structure. Triggering the first release structure disengages the push rod, and the elastic storage device drives the push rod forward. When the push rod reaches a position within a first limiting groove, its forward movement is blocked and stops. Triggering the second release structure disengages the latch from the first limiting groove, and the push rod continues to move forward. When the push rod continues to move into the second limiting groove, its forward movement is blocked and stops. Triggering the third release structure disengages the push rod from the second limiting groove, and the push rod continues to move forward. This invention provides a device for dispensing fluid that allows the patient to trigger the three release structures sequentially to complete the injection process, making it easy for the patient to operate and ensuring injection safety.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a device for dispensing fluids. Background Technology

[0002] Currently, some medicines that cannot be stored in aqueous form usually need to be stored in powder form. Before injection, the aqueous solution must be injected into the powder reagent bottle for mixing, and then the well-mixed powder solution is injected through a syringe, which makes the operation more complicated.

[0003] To facilitate the injection of drug powder, existing technologies use dual-chamber cartridges. A piston separates the cartridge into two chambers, each containing drug powder and water solution respectively. During injection, the piston is pushed forward to mix and inject the drug powder and water solution. However, injection in existing technologies requires manual pushing or the use of an external drive structure (such as electric drive). Summary of the Invention

[0004] The purpose of this invention is to provide a device for dispensing fluids that can automatically perform three steps: powder-liquid mixing, venting, and injection. It is simple to operate and has a simple structure.

[0005] To achieve the above objectives, the present invention provides an apparatus for dispensing fluid, comprising:

[0006] The outer cylinder has an internal accommodating cavity, and the inner peripheral wall of the accommodating cavity is provided with a first limiting groove and a second limiting groove spaced apart from back to front;

[0007] A push rod is disposed within the accommodating cavity, and the rear end of the push rod has a first limiting portion;

[0008] An elastic energy storage device is disposed within the accommodating cavity and connected to the outer cylinder and the push rod;

[0009] A first limiting ring is installed on the outer periphery of the push rod. The first limiting ring has an elastic claw, and the outer periphery of the elastic claw has a buckle.

[0010] A first release structure is installed at the rear end of the outer cylinder, and the first release structure has a second limiting part that cooperates with the first limiting part for limiting.

[0011] The second release structure is installed on the outer cylinder and is spaced in front of the first release structure;

[0012] The third release structure is installed on the outer cylinder and is spaced in front of the second release structure;

[0013] By triggering the first release structure, the first limiting part can be disengaged from the second limiting part, thereby causing the elastic storage device to drive the push rod to rotate forward relative to the outer cylinder. When the push rod moves to the position where the buckle engages in the first limiting groove, the forward rotation of the push rod is blocked and stops. Triggering the second release structure can disengage the buckle from the first limiting groove, thereby causing the push rod to continue moving forward. When the push rod continues to move to the position where the buckle engages in the second limiting groove, the forward rotation of the push rod is blocked and stops. Triggering the third release structure can disengage the buckle from the second limiting groove, thereby causing the push rod to continue moving forward.

[0014] Furthermore, the two-stage injection device also includes a concealed needle sleeve and a concealed needle spring. The concealed needle sleeve is slidably inserted into the front end of the outer cylinder, and the concealed needle spring connects the outer cylinder and the concealed needle sleeve. The front end of the concealed needle sleeve protrudes from the front end of the outer cylinder.

[0015] The second limiting groove has an opening at its front end, and the third release structure includes a top block, which is installed at the rear end of the hidden needle sleeve.

[0016] Furthermore, the top block is wedge-shaped with its thickness gradually increasing from back to front.

[0017] Furthermore, the two-stage injection device also includes a second limiting ring, which is installed on the outer periphery of the push rod and located behind the first limiting ring; the outer peripheral wall of the second limiting ring is provided with a plurality of limiting wings spaced circumferentially.

[0018] An annular groove is provided on the inner peripheral wall of the outer cylinder and in front of the second limiting groove. When the push rod moves forward until the second limiting ring is located in the annular groove, each of the limiting wings opens and engages in the annular groove.

[0019] Furthermore, a sound-emitting ridge is provided between the first limiting groove and the second limiting groove.

[0020] Furthermore, the inner circumferential wall of the outer cylinder is provided with an internal thread, and the outer circumferential wall of the push rod has an external thread that engages with the internal thread.

[0021] Furthermore, the push rod includes a first cylinder and a second cylinder, the first cylinder being spaced around the outer periphery of the second cylinder, the external thread being provided on the outer peripheral wall of the first cylinder, the interior of the second cylinder having a mounting cavity opening towards the rear end, the elastic energy storage device being installed in the mounting cavity, and the elastic energy storage device being connected to the second cylinder.

[0022] Furthermore, the outer peripheral wall of the outer cylinder is provided with a first sliding groove, the first release structure includes a first ring body, the second limiting part is provided on the inner peripheral wall of the first ring body, and the second limiting part extends into the outer cylinder through the first sliding groove; the first limiting part is a plane provided on the outer periphery of the push rod, and the first limiting part is in contact with the second limiting part;

[0023] A spring is connected between the first release structure and the front end of the outer cylinder. By pushing the first ring body to move backward to overcome the spring force, the second limiting part is disengaged from the first limiting part, thus triggering the first release structure.

[0024] Furthermore, a second sliding groove is provided on the outer peripheral wall of the outer cylinder, and a slot is provided on the bottom surface of the second sliding groove. The second release structure includes a second ring body, a locking part and a push block. The first limiting groove is connected to the second sliding groove. The second ring body is slidably sleeved on the second sliding groove, and the locking part is engaged in the slot. The push block extends into the first limiting groove.

[0025] When the buckle is engaged in the first limiting groove, the second ring body can be pushed forward to disengage the engaging part from the groove, and the push block pushes the buckle out of the first limiting groove.

[0026] When the buckle is engaged in the second limiting groove, by pushing the hidden needle sleeve backward, the top block can be inserted between the buckle and the peripheral wall of the second limiting groove, thus pushing the buckle out of the second limiting groove.

[0027] Furthermore, the two-stage injection device also includes a cartridge bottle and a needle assembly. A clamping part is provided on the inner peripheral wall of the front end of the outer cylinder. The cartridge bottle includes a bottle body, a first separator plug, and a second separator plug. The bottle body is mounted on the clamping part. The bottle body has a cavity with openings at both the front and rear. The needle assembly is mounted on the front end of the bottle body. The first separator plug and the second separator plug are slidably disposed in the cavity from back to front. A first drug cavity is defined between the first separator plug and the second separator plug. A second drug cavity is defined between the second separator plug and the needle. A mixing groove is provided on the outer periphery near the rear end of the inner peripheral wall of the second drug cavity.

[0028] Compared with the prior art, the device for dispensing fluid according to the present invention has the following advantages: it is equipped with an elastic storage device and three release structures, so that the three steps of automatic injection can be performed by simply triggering the three release structures in sequence, namely, automatic mixing of medicine and water solvent, air venting before injection and injection, thus realizing automatic injection. The structure is simple. Attached Figure Description

[0029] Figure 1This is a cross-sectional view of the initial state of a two-stage injection device according to some embodiments of the present invention;

[0030] Figure 2 This is a partial cross-sectional view of a two-stage injection device according to some embodiments of the present invention when the first release structure is triggered;

[0031] Figure 3 This is a cross-sectional view of a two-stage injection device according to some embodiments of the present invention when the buckle is engaged in the first limiting groove;

[0032] Figure 4 yes Figure 3 A magnified view of a section at point A;

[0033] Figure 5 This is a cross-sectional view of a two-stage injection device according to some embodiments of the present invention when the clip is engaged in the second limiting groove;

[0034] Figure 6 yes Figure 5 A magnified view of section B;

[0035] Figure 7 This is a cross-sectional view of the two-stage injection device according to some embodiments of the present invention during injection;

[0036] Figure 8 yes Figure 7 A magnified view of section C;

[0037] Figure 9 This is a cross-sectional view of the two-stage injection device according to some embodiments of the present invention after the limiting wings have opened following injection.

[0038] Figure 10 yes Figure 9 A magnified view of a section at point D;

[0039] Figure 11 This is an overall schematic diagram of the outer cylinder according to some embodiments of the present invention;

[0040] Figure 12 This is a cross-sectional view of the push rod according to some embodiments of the present invention;

[0041] Figure 13 This is an overall schematic diagram of the first release structure according to some embodiments of the present invention;

[0042] Figure 14 This is an overall schematic diagram of the second release structure according to some embodiments of the present invention;

[0043] Figure 15 This is an overall schematic diagram of the third release structure and the hidden needle sleeve in some embodiments of the present invention;

[0044] Figure 16 This is an overall schematic diagram of the first limiting ring according to some embodiments of the present invention;

[0045] Figure 17 This is an overall schematic diagram of the second limiting ring according to some embodiments of the present invention;

[0046] Figure 18 This is an overall schematic diagram of the cartridge bottle and needle assembly according to some embodiments of the present invention.

[0047] In the picture,

[0048] 1. Outer cylinder; 101. First limiting groove; 102. Second limiting groove; 103. Internal thread; 104. First sliding groove; 105. Second sliding groove; 1051. Slot; 106. Annular groove;

[0049] 2. Push rod; 201. First limiting part; 202. First cylinder; 2021. External thread; 203. Second cylinder; 2031. Mounting cavity;

[0050] 3. Flexible energy storage device;

[0051] 4. First limiting ring; 401, elastic claw; 4011, buckle;

[0052] 5. Second limiting ring; 501. Limiting wing;

[0053] 6. First release structure; 601. First ring body; 6011. Second limiting part;

[0054] 7. Second release structure; 701. Second ring body; 7011. Snap-fit ​​part; 7012. Push block;

[0055] 8. Third release structure; 801. Top block;

[0056] 9. Hidden needle sleeve;

[0057] 10. Hidden needle spring;

[0058] 11. Stunning vocalization;

[0059] 12. Cartridge bottle; 1201. Bottle body; 12011. Mixing tank; 1202. First separator stopper; 1203. Second separator stopper;

[0060] 13. Needle assembly. Detailed Implementation

[0061] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0062] In the description of this invention, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "lateral," and "longitudinal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0063] In the description of this invention, the terms "provided with," "set up," "connected," and "placed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0065] The preferred technical solution of the present invention will be described below with reference to the embodiments and accompanying drawings.

[0066] like Figure 1-18 As shown, an embodiment of the present invention provides a device for dispensing fluid, comprising: an outer cylinder 1, a push rod 2, an elastic energy storage device 3, a first limiting ring 4, a first release structure 6, a second release structure 7, and a third release structure 8.

[0067] The outer cylinder 1 has a receiving cavity inside, and the inner peripheral wall of the receiving cavity is provided with a first limiting groove 101 and a second limiting groove 102 spaced apart from back to front; the push rod 2 is installed in the receiving cavity, and the rear end of the push rod 2 has a first limiting part 201; the elastic energy storage device 3 is provided in the receiving cavity, and the elastic energy storage device 3 is connected to the outer cylinder 1 and the push rod 2. The elastic energy storage device 3 can drive the push rod 2 to rotate and slide forward relative to the outer cylinder 1; the first limiting ring 4 is installed on the outer periphery of the push rod 2, and the first limiting ring 4 has an elastic claw 401. The outer periphery of the elastic claw 401 has a buckle 4011; the first release structure 6 is installed at the rear end of the outer cylinder 1, and the first release structure 6 has a second limiting part 6011 that cooperates with the first limiting part 201 for limiting; the second release structure 7 is installed on the outer cylinder 1 and is spaced apart in front of the first release structure 6; the third release structure 8 is installed on the outer cylinder 1 and is spaced apart in front of the second release structure 7.

[0068] In some embodiments, the two-stage injection device also integrates a cartridge bottle 12 and a needle assembly 13. A clamping part is also provided on the inner peripheral wall of the front end of the outer cylinder 1. The cartridge bottle 12 includes a bottle body 1201, a first separator plug 1202 and a second separator plug 1203. The bottle body 1201 is mounted on the clamping part and has a cavity with openings at both the front and rear. The needle assembly 13 is mounted on the front end of the bottle body 1201. The first separator plug 1202 and the second separator plug 1203 are slidably disposed in the cavity from back to front. A first drug cavity is defined between the first separator plug 1202 and the second separator plug 1203. A second drug cavity is defined between the second separator plug 1203 and the needle. A mixing groove 12011 is provided on the outer periphery near the rear end of the inner peripheral wall of the second drug cavity.

[0069] Typically, one of the first and second drug chambers contains the drug powder, and the other contains the aqueous solvent.

[0070] As alternatives, the cartridge 12 and needle assembly 13 can be sold separately as accessories from the two-stage injection device, meaning the two-stage injection device may not include the aforementioned cartridge 12 and needle assembly 13.

[0071] Based on the above structure, the specific injection process is as follows:

[0072] Before injection, the dual-chamber cartridge is installed inside the front end of the outer cylinder. At this point, the two-stage injection device is in its initial position. Due to the limiting effect of the first release structure 6 on the push rod 2, the push rod 2 remains locked relative to the outer cylinder 1. See attached diagram for details. Figure 1 ;

[0073] During the mixing stage, when the user triggers the first release structure 6, the first limiting part 201 is disengaged from the second limiting part 6011, thereby releasing the limiting effect of the first release structure 6 on the push rod 2. This allows the elastic energy storage device 3 to drive the push rod 2 to rotate and move forward relative to the outer cylinder 1, which in turn causes the push rod 2 to automatically push the first separator plug 1202 of the dual-chamber cartridge bottle. The first separator plug 1202 moves forward inside the bottle body 1201. Since the first medicine chamber is filled with medicine powder or water solvent, when the first separator plug 1202 is pushed, the medicine powder or water solvent abuts against the second separator plug 1203, thereby pushing the second separator plug 1203 forward. This continues until the push rod 2 moves to the position where the latch 4011 engages with the first limiting groove 101, at which point the forward rotation of the push rod 2 is blocked and stops. At this time, the second separator plug 1203 moves to the mixing tank 12011, and the first medicine chamber and the second medicine chamber are connected. The powder and liquid in the first medicine chamber and the second medicine chamber are mixed. See the following for details. Figure 3 , 4 At this point, the user is prompted to shake the two-stage injection device to ensure that the powder and liquid are mixed more thoroughly.

[0074] During the exhaust phase, after mixing is complete, the user triggers the second release structure 7 to disengage the latch 4011 from the first limiting groove 101, allowing the push rod 2 to continue moving forward. When the push rod 2 continues to move until the latch 4011 engages within the second limiting groove 102, the forward rotation of the push rod 2 is blocked and stops. (See details...) Figure 5 , 6 It can expel the air inside the bottle 1201 after the powder and liquid are mixed from the front end of the needle assembly;

[0075] During the injection phase, after venting, the needle assembly is inserted into the injection site. Triggering the third release structure 8 disengages the latch 4011 from the second limiting groove 102, allowing the push rod 2 to continue moving forward. The second separator plug 1203 pushes the medication away from the vial, injecting the mixed medication into the patient, thus completing the injection. See details below. Figure 7 , 8 .

[0076] Based on the above technical solution, users only need to trigger the three release structures in sequence to automatically perform the three steps of mixing the drug and water solvent, venting air before injection, and injection, thus achieving automatic injection. This makes it easy for patients to perform the injection themselves, and the entire injection process can be completed simply by setting up an elastic energy storage device, making the structure simple.

[0077] In some preferred embodiments, the elastic energy storage device can preferably be a coil spring. The coil spring drives the push rod to rotate and moves forward relative to the outer cylinder. The elastic energy storage device releases elastic force from large to small from the beginning to the end. During the injection process, its elastic force is relatively small, which can ensure that the drug solution can be stably and evenly pushed into the human body during the injection process.

[0078] Preferably, such as Figure 1 , 15 As shown, the two-stage injection device also includes a hidden needle sleeve 9 and a hidden needle spring 10. The hidden needle sleeve 9 is slidably inserted into the front end of the outer cylinder 1, and the hidden needle spring 10 connects the outer cylinder 1 and the hidden needle sleeve 9. The front end of the hidden needle sleeve 9 protrudes from the front end of the outer cylinder 1.

[0079] like Figure 6 , 8 As shown, the front end of the second limiting groove 102 has an opening, and the third release structure 8 includes a top block 801, which is installed at the rear end of the concealed needle sleeve 9. The concealed needle sleeve 9 is set at the front end of the outer cylinder 1, and the front end of the concealed needle sleeve 9 protrudes from the front end of the outer cylinder 1 to prevent the needle from being exposed and causing injury before injection.

[0080] Specifically, the top block 801 is integrated with the hidden needle sleeve 9. During the injection stage, the front end of the hidden needle sleeve 9 is first pressed against the injection site, and the outer cylinder is held forward, which causes the compressed hidden needle spring to move backward until the top block 801 located at the rear end of the hidden needle sleeve 9 is inserted between the buckle 4011 and the bottom wall of the second limiting groove 102. The top block 801 pushes the buckle 4011 out of the second limiting groove 102, releasing the limiting effect of the second limiting groove 102 on the push rod 2. The push rod 2 moves forward automatically, injecting the mixed medicine into the patient's body.

[0081] More preferably, the top block 801 is wedge-shaped with its thickness gradually increasing from back to front. Setting the top block 801 into a wedge shape makes it easier for the top block 801 to be inserted between the buckle 4011 and the bottom wall of the second limiting groove 102.

[0082] More preferably, such as Figure 17 As shown, the two-stage injection device also includes a second limiting ring 5, which is installed on the outer periphery of the push rod 2 and located behind the first limiting ring 4; the outer peripheral wall of the second limiting ring 5 is provided with a plurality of limiting wings 501 spaced circumferentially; correspondingly, as Figure 10 As shown, an annular groove 106 is provided on the inner circumferential wall of the outer cylinder 1, in front of the second limiting groove 102. When the push rod 2 moves forward until the second limiting ring 5 is located in the annular groove 106, each limiting wing 501 opens and engages within the annular groove 106. After injection, the second limiting ring is locked in the annular groove, thus preventing the concealed needle sleeve 9 from retracting, thereby preventing the needle assembly 13 from being exposed after injection and preventing the needle from causing harm to the person after injection.

[0083] Specifically, after the injection is completed and the needle assembly is pulled out from the injection site, the concealed needle sleeve 9 will spring forward, but the second limiting ring 5 is locked in the annular groove 106, which can prevent the concealed needle sleeve 9 from moving backward, thus preventing the needle assembly 13 from being exposed after the injection, so as to prevent the needle from causing harm to the person after the injection.

[0084] Preferably, a sound-emitting ridge 11 is provided between the first limiting groove 101 and the second limiting groove 102. When the sound-emitting ridge 11 is provided between the first limiting groove 101 and the second limiting groove 102, the buckle 4011 and the limiting wing 501 contact the sound-emitting ridge 11 to emit sound and vibration, which serves to remind the patient that this is the air-expelling step, and that the two-stage injection device needs to be placed with the front end facing upwards to expel the air from the bottle body 1201.

[0085] Preferably, the inner peripheral wall of the outer cylinder 1 is provided with an internal thread 103, and the outer peripheral wall of the push rod 2 has an external thread 2021 that meshes with the internal thread 103. The elastic energy storage device 3 drives the push rod 2 to rotate forward relative to the outer cylinder 1, which increases the smoothness of the push rod 2's forward movement. Furthermore, when the drug solution is pushed into the human body during the injection stage, the drug solution delivery speed is uniform and slow, ensuring injection safety.

[0086] More preferably, such as Figure 12 As shown, the push rod 2 includes a first cylindrical body 202 and a second cylindrical body 203. The first cylindrical body 202 is spaced around the outer periphery of the second cylindrical body 203. An external thread 2021 is provided on the outer peripheral wall of the first cylindrical body 202. The interior of the second cylindrical body 203 has a mounting cavity 2031 that opens towards the rear end. An elastic energy storage device 3 is installed in the mounting cavity 2031 and is connected to the second cylindrical body 203. The first cylindrical body 202 is spaced around the outer periphery of the second cylindrical body 203, and a certain gap is left between the first cylindrical body 202 and the second cylindrical body 203 to provide space for the cartridge bottle 12. The elastic energy storage device 3 is installed in the mounting cavity 2031 and connects the mounting cavity 2031 to the outer cylinder 1 to drive the push rod 2 to rotate. The front end face of the second cylindrical body 203 abuts against the first separator plug 1202.

[0087] Preferably, such as Figure 2 , 11 As shown, the outer peripheral wall of the outer cylinder 1 is provided with a first sliding groove 104. The first release structure 6 includes a first ring body 601 and a second limiting part 6011 provided on the inner peripheral wall of the first ring body 601. The second limiting part 6011 extends into the outer cylinder 1 through the first sliding groove 104. The first limiting part 201 is a plane provided on the outer periphery of the push rod 2. The first limiting part 201 is in contact with the second limiting part. A spring is connected between the first release structure 6 and the front end of the outer cylinder 1. By pushing the first ring body 601 to move backward to overcome the spring force, the second limiting part 6011 is disengaged from the first limiting part 201, triggering the first release structure 6.

[0088] In some preferred embodiments, the first limiting part 201 and the second limiting part 6011 are polygons that fit together in shape. When the first limiting part 201 and the second limiting part 6011 are in contact, the first release structure 6 prevents the elastic storage device 3 from driving the push rod 2 to rotate forward. A spring is connected between the first release structure 6 and the front end of the outer cylinder 1. The spring has a preload force, which pushes the first release structure 6 forward to keep the first limiting part 201 and the second limiting part 6011 in a stable contact, so as to prevent the first release structure 6 from being accidentally triggered due to loose contact.

[0089] As some alternative implementations, the second limiting part 6011 of the first release structure 6 can also be configured as an elastic buckle. Correspondingly, the first limiting part 201 of the push rod 2 can be configured as a slot that engages with the elastic buckle. Pushing the first release structure 6 backward to engage the elastic buckle in the slot will release the push rod 2.

[0090] Specifically, in the initial position, the second limiting part 6011 of the first release structure 6 and the first limiting part 201 of the push rod 2 are in contact with each other to limit the push rod 2 and prevent it from rotating. At this time, the first release structure 6 is slid backward along the first slide groove 104, and the first limiting part 201 and the second limiting part 6011 are disengaged from each other, and the limiting effect is lost. The elastic energy storage device 3 drives the push rod 2 to rotate forward relative to the outer cylinder 1 until the buckle 4011 is engaged with the first limiting groove. At this time, the powder and liquid are mixed.

[0091] Preferably, such as Figure 11 , 14 As shown, a second sliding groove 105 is provided on the outer peripheral wall of the outer cylinder 1, and a locking groove 1051 is provided on the bottom surface of the second sliding groove 105. The second release structure 7 includes a second ring body 701, a locking part 7011, and a push block 7012. The first limiting groove 101 communicates with the second sliding groove 105. The second ring body 701 is slidably sleeved on the second sliding groove 105, and the locking part 7011 is engaged in the locking groove 1051. The push block 7012 extends into the first limiting groove 101. The locking part 7011 has a certain elasticity, and the locking groove 1051 and the locking part 7011 are designed to engage with each other to prevent accidental activation of the second release structure 7.

[0092] Specifically, during the exhaust operation, the buckle 4011 is engaged in the first limiting groove 101. By pushing the second ring 701 forward, the engaging part 7011 is pushed out of the groove 1051, and the limiting effect between the engaging part 7011 and the groove 1051 is lost. The push block 7012 slides forward to push the buckle 4011 out of the first limiting groove 101. At this time, the buckle 4011 is no longer limited by the first limiting groove 101. The push rod 2 continues to rotate forward until the buckle 4011 is engaged in the second limiting groove 102.

[0093] In summary, the present invention provides a device for dispensing fluid. This two-stage injection device is equipped with three release structures, which correspond to the three steps of mixing the drug with the water solvent, venting air before injection, and injection. The two-stage injection device has a built-in elastic storage device that triggers the three release structures sequentially from back to front. The elastic storage device drives the two-stage injection device to automatically perform the above steps to achieve automatic injection and ensure the safety of independent injection for patients.

[0094] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A device for dispensing a fluid, characterized in that: include, The outer cylinder has an internal cavity, and the inner peripheral wall of the cavity is provided with a first limiting groove and a second limiting groove spaced apart from back to front. A push rod is disposed within the accommodating cavity, and the rear end of the push rod has a first limiting portion; An elastic energy storage device is disposed within the accommodating cavity and connected to the outer cylinder and the push rod; A first limiting ring is installed on the outer periphery of the push rod. The first limiting ring has an elastic claw, and the outer periphery of the elastic claw has a buckle. A first release structure is installed at the rear end of the outer cylinder, and the first release structure has a second limiting part that cooperates with the first limiting part for limiting. The second release structure is installed on the outer cylinder and is spaced in front of the first release structure; The third release structure is installed on the outer cylinder and is spaced in front of the second release structure; By triggering the first release structure, the first limiting part can be disengaged from the second limiting part, thereby causing the elastic energy storage device to drive the push rod to rotate forward relative to the outer cylinder. When the push rod moves to the position where the buckle is engaged in the first limiting groove, the forward rotation of the push rod is blocked and stops. Triggering the second release structure can disengage the buckle from the first limiting groove, thereby causing the push rod to continue moving forward. When the push rod continues to move to the position where the buckle is engaged in the second limiting groove, the forward rotation of the push rod is blocked and stops. Triggering the third release structure can disengage the buckle from the second limiting groove, thereby causing the push rod to continue moving forward. It also includes a cartridge bottle and a needle assembly. The inner peripheral wall of the front end of the outer cylinder is provided with a clamping part. The cartridge bottle includes a bottle body, a first separator plug and a second separator plug. The bottle body is mounted on the clamping part. The bottle body has a cavity with openings at both the front and rear. The needle assembly is mounted on the front end of the bottle body. The first separator plug and the second separator plug are slidably disposed in the cavity from back to front. A first medicine cavity is defined between the first separator plug and the second separator plug. A second medicine cavity is defined between the second separator plug and the needle. A mixing groove is opened on the outer peripheral wall of the second medicine cavity near the rear end. The push rod can push the first separator plug to slide in the cartridge bottle.

2. A device for dosing a fluid according to claim 1, characterized in that It also includes a hidden needle sleeve and a hidden needle spring. The hidden needle sleeve is slidably inserted into the front end of the outer cylinder, and the hidden needle spring connects the outer cylinder and the hidden needle sleeve. The front end of the hidden needle sleeve protrudes from the front end of the outer cylinder. The second limiting groove has an opening at its front end, and the third release structure includes a top block, which is installed at the rear end of the hidden needle sleeve. When the buckle is engaged in the second limiting groove, by pushing the hidden needle sleeve backward, the top block can be inserted between the buckle and the peripheral wall of the second limiting groove, thereby disengaging the buckle from the second limiting groove.

3. The apparatus for dispensing fluid according to claim 2, characterized in that, The top block is wedge-shaped with its thickness gradually increasing from back to front.

4. The apparatus for dispensing fluid according to claim 2, characterized in that, It also includes a second limiting ring, which is installed on the outer periphery of the push rod and located behind the first limiting ring; the outer periphery of the second limiting ring is provided with a plurality of limiting wings spaced circumferentially. An annular groove is provided on the inner peripheral wall of the outer cylinder and in front of the second limiting groove. When the push rod moves forward until the second limiting ring is located in the annular groove, each of the limiting wings opens and engages in the annular groove.

5. The apparatus for dispensing fluid according to claim 1, characterized in that, A sound-emitting ridge is provided between the first limiting groove and the second limiting groove.

6. The apparatus for dispensing fluid according to claim 1, characterized in that, The inner circumferential wall of the outer cylinder is provided with an internal thread, and the outer circumferential wall of the push rod has an external thread that meshes with the internal thread.

7. The apparatus for dispensing fluid according to claim 6, characterized in that, The push rod includes a first cylinder and a second cylinder. The first cylinder is spaced around the outer periphery of the second cylinder. The external thread is provided on the outer peripheral wall of the first cylinder. The interior of the second cylinder has a mounting cavity that opens towards the rear end. The elastic energy storage device is installed in the mounting cavity and is connected to the second cylinder.

8. The apparatus for dispensing fluid according to claim 1, characterized in that, The outer cylinder has a first groove on its outer peripheral wall. The first release structure includes a first ring body. The second limiting part is disposed on the inner peripheral wall of the first ring body and extends into the outer cylinder through the first groove. The first limiting part is a plane disposed on the outer periphery of the push rod and fits against the second limiting part. A spring is connected between the first release structure and the front end of the outer cylinder. The first release structure can be triggered by pushing the first ring body to move backward.

9. The apparatus for dispensing fluid according to claim 1, characterized in that, The outer peripheral wall of the outer cylinder is provided with a second sliding groove, and the bottom surface of the second sliding groove is provided with a slot. The second release structure includes a second ring body, a locking part and a push block. The first limiting groove is connected to the second sliding groove. The second ring body is slidably sleeved on the second sliding groove, and the locking part is engaged in the slot. The push block extends into the first limiting groove. When the buckle is engaged in the first limiting groove, the second ring body can be pushed forward to disengage the engaging part from the groove, and the pusher pushes the buckle out of the first limiting groove.

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