A quantitative fluid delivery device

Abstract

The present application relates to the technical field of syringe, in particular to a quantitative fluid delivery device, which comprises a top cover, an upper shell, a lower shell and a safety cap, the top cover is fixedly connected with one end of the upper shell, the other end of the upper shell is clamped with the lower shell, the other end of the lower shell is clamped with the safety cap, a needle cover is slidably connected in the lower shell, a limiting ring and a driving rod are arranged in the upper shell, the limiting ring is slidably connected in the upper shell, the limiting ring is slidably arranged relative to the driving rod, a screw rod is arranged in the driving rod, the screw rod is connected with a piston in a medicine bottle bin, a torsional spring is arranged outside the driving rod, and the torsional spring is used for providing power for the driving rod; the driving rod has two states, including a locking state and an excitation state; when in the locking state, the driving rod cannot rotate; when in the excitation state, the limiting ring releases the driving rod, the driving rod rotates under the action of the torsional spring, the screw rod rotates, the piston moves, and quantitative medicine injection is carried out; the injection is efficient, stable and convenient, and it is convenient for patients to complete independent self-medication.

Description

Technical Field

[0001] This invention relates to the field of syringe technology, and more particularly to a quantitative fluid delivery device. Background Technology

[0002] Disposable pre-filled syringe vials are currently the most commonly used packaging material for medicines in the medical syringe field. In application scenarios, mechanical, energy storage, and automatic injection devices have been developed to enable fast, efficient, and stable injection, allowing for efficient, safe, and convenient self-administration.

[0003] Currently, injection devices used in pre-filled syringes on the market generally deliver all the medication at once. In order to adapt to more refined clinical use cases of self-administration, injection devices that deliver a fixed dose in a single injection and complete the administration through multiple automatic injections are very necessary.

[0004] Therefore, there is an urgent need to provide a quantitative fluid delivery device that, compared to existing technologies, provides efficient, stable, and convenient injection, allowing patients to perform independent self-administration. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art and provides a quantitative fluid delivery device.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A quantitative fluid delivery device includes a top cover, an upper shell, a lower shell, and a safety helmet. The top cover is fixedly connected to one end of the upper shell, the other end of the upper shell is snapped into the lower shell, and the other end of the lower shell is snapped into the safety helmet.

[0008] The lower shell is slidably connected to the hidden needle sleeve. The upper shell is provided with a limiting ring and a driving rod. The limiting ring is slidably connected to the upper shell and is slidably disposed relative to the driving rod. The driving rod is provided with a screw and is connected to a piston in the medicine bottle compartment. A torsion spring is provided on the outside of the driving rod and is used to provide power to the driving rod.

[0009] The drive rod has two states: a locked state and an activated state. When locked, the drive rod cannot rotate under the action of the limiting ring. When activated, the limiting ring releases the drive rod, which rotates under the action of the torsion spring, driving the screw to rotate and driving the piston to move for quantitative drug injection.

[0010] Furthermore, the inner wall of the limiting ring is provided with a limiting block, and the outer wall of the driving rod is provided with a first abutting surface and a second abutting surface; when in the locked state, the limiting block abuts against the first abutting surface; when in the activated state, the limiting block abuts against the second abutting surface.

[0011] Furthermore, the first abutting surface is disposed on the side wall of the first abutting block, and the second abutting surface is disposed on the side wall of the second abutting block. The first abutting block and the second abutting block are at a certain distance in both the axial and circumferential directions of the drive rod.

[0012] Furthermore, the first abutting surface and the second abutting surface are two opposite sidewalls of the first abutting block and the second abutting block.

[0013] Furthermore, the first abutting surface, the second abutting surface, and the limiting block are arranged opposite to each other, and one or more sets of the first abutting surface and the second abutting surface are provided.

[0014] Furthermore, a limiting plate is integrally connected to the end of the inner wall of the upper shell near the lower shell. The end face of the limiting plate away from the lower shell is provided with multiple protruding ribs. A sound-emitting rib is provided at the end of the drive rod. The sound-emitting rib is elastic. When the drive rod rotates, the sound-emitting rib makes intermittent contact with the protruding ribs and emits a prompting sound.

[0015] Furthermore, the limiting plate has a threaded opening at its center, and the screw passes through the threaded opening and is fixedly connected to the screw cap. The screw is fixedly connected to the piston, and the screw engages with the threaded opening.

[0016] Furthermore, one end of the limiting ring is connected to multiple sliding ribs, one end of the hidden needle sleeve is fixedly connected to multiple sliders, the sliders are arranged opposite to the sliding ribs, the limiting plate is provided with a clearance groove, and the sliding ribs are arranged through the corresponding clearance grooves.

[0017] Furthermore, the hidden needle sleeve is slidably connected to the bracket, and multiple first snap-fit ​​blocks and multiple second snap-fit ​​blocks are fixedly connected to the end of the bracket. The first snap-fit ​​blocks are connected to a first limiting channel, and the second snap-fit ​​blocks are connected to a second limiting channel. The slider is slidably connected within the first limiting channel or the second limiting channel.

[0018] Furthermore, one end of the torsion spring is fixedly connected to the drive rod, and the other end is fixedly connected to the top cover; a compression spring is fixedly connected to the limiting block, and the other end of the compression spring is fixedly connected to the top cover. The compression spring is used to reset the limiting ring and the hidden needle sleeve.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention utilizes the retraction of the concealed needle sleeve and the upward sliding of the limiting ring to unlock the first stage of the drive rod, triggering automatic injection. The drive rod rotates the screw at a preset angle, causing the limiting block to contact the side wall opposite to the second contact surface on the drive rod's second contact block, stopping the injection. At this point, under the action of the compression spring, the limiting block contacts the first contact block, achieving a single quantitative injection. Repeatedly performing the above operations allows for multiple quantitative injections, achieving a fixed dose per injection without requiring user settings, reducing setting deviations and operational complexity, and achieving high efficiency and convenience. It is suitable for patients to perform independent drug administration, reducing the complexity of patient training and usage scenarios. The concealed needle sleeve allows the injection needle to be hidden before injection, which is very friendly to patients with needle phobia. The built-in torsion spring stores energy, providing stable and reliable injection power without requiring external force from the patient, resulting in a more scientific and reliable injection effect. Attached Figure Description

[0021] Figure 1 This is a front view of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the limiting ring of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the drive rod of the present invention.

[0024] Figure 4 This is a schematic diagram of the upper shell structure of the present invention.

[0025] Figure 5 This is an exploded view showing the connection relationship between the hidden needle sleeve, the support, and the medicine bottle compartment of the present invention.

[0026] Figure 6 This is a cross-sectional view of the initial state of the present invention.

[0027] Figure 7 This is a cross-sectional view of the present invention in the stimulated injection state.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Top cover; 2. Upper shell; 21. Limiting plate; 22. Raised rib; 23. Threaded opening; 3. Lower shell; 4. Safety cap; 5. Compression spring; 6. Limiting ring; 61. Limiting block; 62. Injection contact surface; 63. Sliding rib; 64. Mounting surface; 7. Hidden needle sleeve; 71. Slider; 72. Raised block; 8. Screw; 9. Screw cap; 10. Drive rod; 101. First contact surface; 102. Second contact surface; 103. Sound-emitting rib; 11. Bracket; 111. First locking block; 112. Second locking block; 12. Torsion spring; 13. Medicine bottle compartment; 131. Raised edge. Detailed Implementation

[0030] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention. It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They 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, and therefore should not be construed as a limitation of the present invention.

[0031] like Figure 1 , Figure 6 As shown, this invention provides a quantitative fluid delivery device, including a top cover 1, an upper shell 2, a lower shell 3, and a safety cap 4. The top cover 1 is fixedly connected to one end of the upper shell 2, and the other end of the upper shell 2 is snapped into the lower shell 3. The other end of the lower shell 3 is snapped into the safety cap 4. A bracket 11 is provided inside the lower shell 3, and a medicine bottle compartment 13 is snapped into the bracket 11. A hidden needle sleeve 7 is slidably connected to the outside of the bracket 11. A limiting ring 6 and a driving rod 10 are provided inside the upper shell 2. The limiting ring 6 is slidably connected inside the upper shell 2, and the hidden needle sleeve 7 is slidably connected inside the lower shell 3. When the hidden needle sleeve 7 is subjected to external force, the limiting ring 6 slides, limiting the movement of the limiting ring 6. The positioning ring 6 and the drive rod 10 have two states: a locked state and an activated state. The hidden needle sleeve 7 drives the positioning ring 6 and the drive rod 10 to switch between the two states. The drive rod 10 is equipped with a screw 8, which passes through the upper shell 2 and is connected to the piston in the vial compartment 13. The screw 8 is threadedly connected to the upper shell 2. When in the activated state, the drive rod 10 is driven to rotate by the torsion spring 12, which causes the screw 8 to move linearly and drive the piston to move, thereby performing quantitative drug injection. Before use, the torsion spring 12 is set to rotate and store energy to provide rotational propulsion kinetic energy during automatic injection.

[0032] like Figure 2 , Figure 3 As shown, the inner wall of the limiting ring 6 is provided with a limiting block 61. In this embodiment, two limiting blocks 61 are provided. The limiting ring 6 is integrally connected with multiple sliding ribs 63 and a mounting cylinder is provided at the other end. The outer wall of the mounting cylinder is provided as a mounting surface 64. The end face of the sliding rib 63 away from the mounting surface 64 is provided as an injection contact surface 62. The upper shell 2 is provided with a sliding track of the limiting ring 6. The outer wall of the sliding rib 63 is slidably limited to the sliding track of the limiting ring 6. A compression spring 5 is fixedly connected to the mounting surface 64. The other end of the compression spring 5 is fixedly connected to the top cover 1.

[0033] The outer wall of the drive rod 10 is provided with one or more sets of first abutment blocks and second abutment blocks. Each set has one first abutment block and one second abutment block. The first abutment block and the second abutment block in the same set are at a certain distance in both the axial and circumferential directions of the drive rod 10. The sidewalls of the first abutment block and the second abutment block in the same set are respectively the first abutment surface 101 and the second abutment surface 102. The first abutment surface 101 is located on the first abutment block, and the second abutment surface 102 is located on the second abutment block. The number of sets of first abutment blocks and second abutment blocks is determined in conjunction with the pitch of the screw 8 according to different injection doses, and at least one set is provided. One end of the torsion spring 12 is fixedly connected to the drive rod 10, and the other end is fixedly connected to the top cover 1.

[0034] The number of limiting blocks 61 corresponds to the number of sets of first and second abutment blocks on the outer wall of the drive rod 10. When in the locked state, the corresponding limiting block 61 abuts against the first abutment surface 101, blocking the first abutment block and resisting the rotational force of the torsion spring 12 to achieve the locking effect. When the hidden needle sleeve 7 is subjected to external force, it moves towards the top cover 1, and the limiting ring 6 moves synchronously. The limiting block 61 moves to the point where it abuts against the second abutment surface 102, and the drive rod 10 changes to the activated state. At this time, the limiting block 61 does not block the second abutment block. The drive rod 10 rotates at a set angle under the action of the torsion spring 12 to realize the activation function; the outer wall of the screw 8 is provided with a sliding groove, which extends along the axial direction of the screw 8; the inner wall of the drive rod 10 is provided with a slider 71 that matches the sliding groove, and the slider 71 is located inside the sliding groove. When the drive rod 10 rotates, it drives the screw 8 to rotate. Since the screw 8 is threadedly connected to the upper shell 2, and the circumferential limit between the drive rod 10 and the screw 8 is provided by the slider 71 and the sliding groove, the screw 8 pushes the piston in the medicine bottle chamber 13 to move in the injection direction, thereby realizing drug injection.

[0035] like Figure 3 , Figure 4 As shown, a limiting plate 21 is integrally connected to the inner wall of the upper shell 2 near the end of the lower shell 3. The limiting plate 21 has a threaded opening 23 at its center. The screw 8 passes through the threaded opening 23 and is threadedly connected to the threaded opening 23. The side wall of the limiting plate 21 away from the lower shell 3 has multiple ribs 22. The multiple ribs 22 are spaced apart along the circumference of the limiting plate 21. The driving rod 10 is located on the side of the limiting plate 21 away from the lower shell 3. The end of the driving rod 10 is provided with a sound-emitting rib 103. The sound-emitting rib 103 is an elastic structure. During the rotation of the driving rod 10, the sound-emitting rib 103 intermittently contacts the ribs 22 and emits a "tap tap tap" prompting sound. The limiting plate 21 has a clearance groove, and the sliding rib 63 passes through the clearance groove.

[0036] The end of the screw 8 away from the top cover 1 is fixedly connected to the screw cap 9, and the screw cap 9 is fixedly connected to the piston inside the medicine bottle compartment 13.

[0037] like Figure 5As shown, one end of the support 11 is provided with a first locking block 111 and a second locking block 112. There are two first locking blocks 111 and two second locking blocks 112. A first limiting channel is formed between the two first locking blocks 111, and a second limiting channel is formed between the two second locking blocks 112. The end of the medicine bottle compartment 13 away from the injection needle is provided with a protruding edge 131, which engages with the inner walls of the first locking blocks 111 and the second locking blocks 112, thereby engaging the medicine bottle compartment 13 with the support. Inside section 11; Multiple sliders 71 are provided near the limiting ring 6 at one end of the concealed needle sleeve 7. The number of sliders 71 is the same as the number of sliding ribs 63 and they are correspondingly arranged. A protrusion 72 is provided on the inner wall of each slider 71. The distance from the protrusion 72 to the end of the concealed needle sleeve 7 where the slider 71 is located is the sliding distance of the concealed needle sleeve 7. The protrusion 72 is used to limit the sliding of the concealed needle sleeve 7. Preferably, two sliders 71 are provided, and the two sliders 71 extend into the first limiting channel and the second limiting channel respectively to achieve limited sliding of the sliders 71. A sliding track for the concealed needle sleeve 7 is provided on the inner side of the lower shell 3, and the concealed needle sleeve 7 is slidably connected within the sliding track of the concealed needle sleeve 7.

[0038] The working principle of the quantitative fluid delivery device provided by this invention is as follows: After the upper shell 2 and the lower shell 3 are fastened together, the sliding track of the limiting ring 6 provided on the upper shell 2 and the sliding track of the hidden needle sleeve 7 provided on the lower shell 3 are arranged in parallel, so that when the hidden needle sleeve 7 slides, it drives the limiting ring 6 to slide synchronously. Figure 6 As shown, when the concealed needle sleeve 7 is not subjected to external force, it covers the injection needle tip, and the limiting block 61 abuts against the first contact surface 101, in a locked state. The limiting block 61 resists the force of the torsion spring 12 driving the drive rod 10 to rotate, and injection cannot be performed at this time; Figure 7 As shown, when the hidden needle sleeve 7 is subjected to external force, the limiting ring 6 moves towards the top cover 1 along with the hidden needle sleeve 7. The limiting block 61 abuts against the second contact surface 102 and changes to the activated state. At this time, the drive rod 10 is released and rotates under the action of the torsion spring 12, driving the screw 8 to rotate. Through the engagement of the screw 8 with the upper shell 2, the screw 8 rotates and moves towards the lower shell 3, pushing the piston to move and causing the liquid to be injected in a quantitative manner. After this quantitative injection is completed, the hidden needle sleeve 7 is no longer under force. Under the action of the spring, the limiting ring 6 and the hidden needle sleeve 7 are reset. The limiting ring 6 abuts against the first contact surface 101 and returns to the locked state, waiting for the next injection.

[0039] This invention utilizes the retraction of the concealed needle sleeve 7 and the upward sliding of the limiting ring 6 to unlock the drive rod 10, triggering automatic injection. The drive rod 10 drives the screw 8 to rotate at a preset angle, causing the limiting block 61 to contact the side wall opposite to the second contact surface 102 on the second contact block of the drive rod 10, stopping the injection. At this time, under the action of the compression spring 5, the limiting block 61 contacts the first contact block, achieving a single quantitative injection. By performing the above operation multiple times, multiple quantitative injections can be achieved, realizing a single fixed dose without requiring user settings, reducing setting deviations and operational complexity, and achieving high efficiency and convenience. It is suitable for patients to perform independent drug administration, reducing the training of patients' ability to use the product and the complexity of the usage scenario. The concealed needle sleeve 7 allows the injection needle to be hidden before injection, which is very friendly to patients with needle phobia. The built-in torsion spring 12 stores energy, requiring no external force from the patient, providing stable and reliable injection power, and making the injection effect more scientific and reliable.

[0040] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A quantitative fluid delivery device, characterized in that, It includes a top cover, an upper shell, a lower shell, and a safety helmet. The top cover is fixedly connected to one end of the upper shell, the other end of the upper shell is snapped into the lower shell, and the other end of the lower shell is snapped into the safety helmet. The lower shell is slidably connected to the hidden needle sleeve. The upper shell is provided with a limiting ring and a driving rod. The limiting ring is slidably connected to the upper shell and is slidably disposed relative to the driving rod. The driving rod is provided with a screw and is connected to a piston in the medicine bottle compartment. A torsion spring is provided on the outside of the driving rod and is used to provide power to the driving rod. The drive rod has two states: a locked state and an activated state. When it is locked, the drive rod cannot rotate under the action of the limiting ring. When it is activated, the limiting ring releases the drive rod, and the drive rod rotates under the action of the torsion spring, which drives the screw to rotate and drives the piston to move for quantitative drug injection. The hidden needle sleeve drives the limiting ring to slide axially, realizing the transition between the locked state and the activated state of the drive rod.

2. The quantitative fluid conveying device according to claim 1, characterized in that, The inner wall of the limiting ring is provided with a limiting block, and the outer wall of the driving rod is provided with a first abutting surface and a second abutting surface; when in the locked state, the limiting block abuts against the first abutting surface; when in the activated state, the limiting block abuts against the second abutting surface.

3. The quantitative fluid conveying device according to claim 2, characterized in that, The drive rod is provided with a first abutting block and a second abutting block. The first abutting surface is provided on the side wall of the first abutting block, and the second abutting surface is provided on the side wall of the second abutting block. The first abutting block and the second abutting block are spaced apart in both the axial and circumferential directions of the drive rod.

4. A quantitative fluid conveying device according to claim 3, characterized in that, The first abutting surface and the second abutting surface are two opposite sidewalls of the first abutting block and the second abutting block.

5. A quantitative fluid conveying device according to claim 2, characterized in that, The first abutting surface, the second abutting surface, and the limiting block are arranged opposite to each other, and one or more sets of the first abutting surface and the second abutting surface are provided.

6. A quantitative fluid delivery device according to claim 1, characterized in that, A limiting plate is integrally connected to the inner wall of the upper shell near the end of the lower shell. The end face of the limiting plate away from the lower shell is provided with multiple protruding ribs. A sound-emitting rib is provided at the end of the drive rod. The sound-emitting rib is elastic. When the drive rod rotates, the sound-emitting rib makes intermittent contact with the protruding ribs and emits a prompting sound.

7. A quantitative fluid conveying device according to claim 6, characterized in that, The limiting plate has a threaded opening at its center. The screw passes through the threaded opening and is fixedly connected to the screw cap. The screw is fixedly connected to the piston and engages with the threaded opening.

8. A quantitative fluid conveying device according to claim 6, characterized in that, One end of the limiting ring is connected to multiple sliding ribs, and one end of the hidden needle sleeve is fixedly connected to multiple sliders. The sliders are arranged opposite to the sliding ribs. The limiting plate is provided with a clearance groove, and the sliding ribs are arranged through the corresponding clearance grooves.

9. A quantitative fluid conveying device according to claim 8, characterized in that, The hidden needle sleeve is slidably connected to the bracket. Multiple first snap-fit ​​blocks and multiple second snap-fit ​​blocks are fixedly connected to the end of the bracket. A first limiting channel is formed between adjacent first snap-fit ​​blocks, and a second limiting channel is formed between adjacent second snap-fit ​​blocks. The slider is slidably connected within the first limiting channel or the second limiting channel.

10. A quantitative fluid conveying device according to claim 2, characterized in that, One end of the torsion spring is fixedly connected to the drive rod, and the other end is fixedly connected to the top cover; a compression spring is fixedly connected to the limiting block, and the other end of the compression spring is fixedly connected to the top cover. The compression spring is used to reset the limiting ring and the hidden needle sleeve.

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