Energy storage type automatic injection device

Abstract

The invention relates to the field of injection devices, in particular to an energy storage type automatic injection device which comprises a shell, an energy storage type injection assembly, a transmission locking assembly and a pre-filling injection medicine bottle. The energy storage type injection assembly is sleeved with the transmission locking assembly, and the transmission locking assembly is used for locking and releasing the energy storage type injection assembly; the released energy storage type injection assembly triggers the pre-filling injection medicine bottle to achieve automatic injection. Injection triggering is driven by the built-in energy storage part, external force does not need to be applied to a patient, stable and reliable injection power is provided, and the injection effect is more scientific and reliable. And the use process is more convenient and efficient, the system is very suitable for home self-administration, and the use ability training of patients and complex use scenes are reduced.

Description

Technical Field

[0001] The present invention relates to the field of injection devices, in particular to an energy storage type automatic injection device. Background Art

[0002] Syringes are a commonly used medical device in the healthcare field, but traditional syringes and related technologies have many shortcomings. Currently, the exposed needle of common syringes during use can cause psychological stress for patients, especially those with a fear of needles. This psychological burden can affect the smooth progress of the injection procedure.

[0003] Furthermore, traditional syringes lack adequate needle protection after the injection, making it easy for medical staff or patients to be injured by accidental contact with the needle. The exposed needle also poses a risk of cross-infection when the device is discarded.

[0004] To overcome these shortcomings, some syringes with protective devices have appeared on the market. However, the triggering methods of these devices have obvious shortcomings: either the structure is simple but the needle protection is not reliable, or it requires a lot of effort to trigger the switch to activate the protective device; neither is reliable nor easy to trigger.

[0005] Therefore, there is an urgent need for a stored energy automatic injection device. Summary of the Invention

[0006] In order to overcome the problems existing in the prior art, the present invention aims to provide an energy storage automatic injection device.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a stored-energy automatic injection device, comprising: a housing, a stored-energy injection assembly, a transmission locking assembly, a pen cap, and a pre-filled injection bottle; The housing is sleeved on the outside of the transmission locking assembly, and the transmission locking assembly includes a hidden needle sleeve, a transmission cylinder and a release ring; one end of the hidden needle sleeve extends out of the top of the housing, and the other end of the hidden needle sleeve is sequentially provided with a transmission cylinder and a release ring; the inner wall of the release ring is provided with a first clamping rib, the outer wall of the release ring is provided with a fixed clamping groove, and the inner wall of the housing is provided with a locking rib, and the fixed clamping groove is clamped with the locking rib; The energy storage injection assembly includes an energy storage part, a driving rod, a screw and a limiting ring; a second clamping rib is provided on the side wall of the driving rod, the driving rod is inserted into the release ring, and the first clamping rib is clamped with the second clamping rib in the circumferential direction; the limiting ring is connected to the outer shell, and a threaded hole is provided on the limiting ring; the driving rod is connected to the energy storage part, and the driving rod is connected to the screw, and after the screw passes through the threaded hole, it abuts against the piston at the tail of the pre-filled injection bottle.

[0008] The energy storage injection assembly is sleeved within the transmission locking assembly, which is used to lock and release the energy storage injection assembly. That is, in the initial state, the snap-fit ​​groove on the outer wall of the release ring snaps into engagement with the outer shell locking rib, limiting the circumferential rotation of the release ring in the initial position through the outer shell. The drive rod of the energy storage injection assembly is inserted into the release ring, and the first snap-fit ​​rib snaps into engagement with the second snap-fit ​​rib in the circumferential direction, further limiting the circumferential rotation of the drive rod. The energy storage component stores energy and forces during the product assembly process. Due to the aforementioned restriction on circumferential rotation, the energy storage component remains in a stored force state when not in use.

[0009] During injection, when the hidden needle sleeve contacts the skin and is pushed into the shell, the hidden needle sleeve drives the transfer cylinder and the release ring to move along the axial direction of the shell in turn. When the first clamping rib of the release ring is separated from the second clamping rib of the drive rod, the energy storage part on the drive rod is no longer constrained, and its stored energy is released to drive the drive rod to rotate. The drive rod drives the screw at the bottom to rotate, and the limiting ring is in a fixed state relative to the shell, so that the screw rotates to push the piston of the pre-filled injection bottle to move, completing the automatic injection action.

[0010] The present invention is further configured such that: the energy storage member is a torsion spring, one end of which is connected to the limiting ring and the other end is connected to the driving rod. The torsion spring drives the driving rod to rotate, thereby causing the screw connected to the driving rod to achieve axial movement relative to the limiting ring.

[0011] The present invention is further configured as follows: the inner wall of the bottom end of the driving rod is provided with a connecting rib, the side wall of the screw rod is provided with a connecting groove, and the screw rod is connected to the connecting rib on the driving rod through the connecting groove.

[0012] The present invention is further configured as follows: a first buckle is provided on the outer wall of the limiting ring, and a first buckle groove is correspondingly provided on the side wall of the shell. The first buckle is engaged with the first buckle groove to fix the limiting ring inside the shell.

[0013] The limiting ring is in a fixed state relative to the housing, the screw is engaged with the threaded hole of the limiting ring, and the driving rod is driven to rotate by the energy storage component, driving the screw to rotate and move downward relative to the limiting ring.

[0014] The present invention is further configured as follows: the transmission locking assembly also includes a double buckle, which is arranged at an end of the release ring away from the driving rod, and a connecting ring is arranged inside the double buckle; a second buckle is provided on the outer wall of the release ring, and the double buckle is sleeved on the outside of the release ring.

[0015] When the release ring moves axially, the first clamping rib of the release ring is separated from the second clamping rib of the drive rod, the release ring is inserted into the double buckle ring, and the second buckle is clamped with the connecting ring to connect the release ring and the double buckle ring.

[0016] The present invention is further configured as follows: the energy storage automatic injection device further includes a pen cover, the pen cover being mounted on the rear end of the housing; a second snap groove and a third snap groove are sequentially provided on the side wall of the housing at a certain distance from the rear end of the housing; The outer wall of the double buckle is further provided with an elastic arm, on which a third buckle is provided; in an initial state, the third buckle is engaged with the second buckle groove; The transmission locking assembly further comprises a spring, one end of the spring abuts against the release ring, and the other end of the spring abuts against the pen cover.

[0017] Specifically, the release ring compresses the spring during axial movement, storing energy in the spring. When the hidden needle sleeve moves away from the skin, the spring drives the release ring to reset. Because the release ring is inserted into and connected to the double buckle ring during the retraction of the hidden needle sleeve, the spring forces the release ring to move downward simultaneously, disengaging the third buckle from the second buckle slot and securing it in the third buckle slot. The third buckle slot restricts rearward axial movement of the transmission locking assembly, preventing the reset hidden needle sleeve from retracting into the housing, thereby achieving needle puncture protection.

[0018] The present invention is further configured as follows: the driving rod is further provided with a shifting rod, the shifting rod is arranged around the circumference of the driving rod, and the driving rod is sleeved inside the transmission cylinder; The inner wall of the transmission cylinder is provided with ratchet teeth, and the ratchet teeth are engaged with the shifting rod.

[0019] During the rotation and release process of the drive rod, the lever rotates, deforms, and hits the ratchet teeth of the transfer cylinder, generating a "ticking" injection sound and vibration feedback, interactively reminding the user of the injection progress. When the "ticking" sound stops, it reminds the user that the injection progress is complete.

[0020] The present invention is further configured as follows: the hidden needle sleeve includes a hidden needle section and a connecting rod section, the hidden needle section extending from the top end of the housing; the stored-energy automatic injection device also includes a medicine bottle holder, the medicine bottle holder being disposed between the limiting ring and the hidden needle sleeve, and the medicine bottle holder being used to secure a prefilled injection medicine bottle; the needle end of the prefilled injection medicine bottle passes through the medicine bottle holder and extends into the hidden needle section; The side walls of the medicine bottle holder and the limiting ring are provided with avoidance grooves, and the connecting rod section passes through the avoidance grooves of the medicine bottle holder and the limiting ring in sequence and then abuts against the transfer cylinder.

[0021] The present invention is further configured as follows: an observation window is further provided on the side wall of the housing, and the observation window is provided at a position of the housing corresponding to the medicine bottle holder; the observation window is used to assist in observing whether the piston of the pre-filled injection medicine bottle has moved to the bottom end; The side wall of the medicine bottle holder is a hollow structure or a transparent material.

[0022] In summary, the beneficial effects of the above technical solution of the present invention are as follows: The injection trigger of this invention is driven by the device's built-in energy storage device, eliminating the need for external force from the patient and providing stable and reliable injection power, ensuring a more scientific and reliable injection effect. The two-step injection action is convenient and efficient, making it ideal for home self-administration, reducing patient training and complex usage scenarios.

[0023] 2. In the present invention, the injection needle is hidden in the protective tube during and after the injection process, which weakens the psychological impact of the needle on the patient and enhances the effectiveness of needle protection.

[0024] 3. Regardless of whether the injection is complete, for example, if the needle is withdrawn mid-injection, the needle guard automatically locks once it retracts and resets, preventing the needle from leaking out. This not only provides needle puncture protection but also prevents secondary injections. A single dose is administered to a single patient, ensuring safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the structure of an energy storage automatic injection device; Figure 2 This is an exploded view of the energy storage automatic injection device; Figure 3 This is a schematic diagram of the internal structure of the energy storage automatic injection device; Figure 4 This is a schematic diagram of the connection between the release ring and the double buckle ring when the hidden needle sleeve is retracted; Figure 5 This is a schematic diagram of the structure of the energy storage injection assembly; Figure 6 Schematic diagram of the connection between the release ring, the double buckle ring and the housing when the hidden needle sleeve is in the retracted state; Figure 7 This is a schematic diagram of the connection between the release ring, the double buckle ring and the housing when the hidden needle sleeve is locked; Figure 8 Schematic diagram of the driving rod structure; Figure 9 Schematic diagram of the release ring structure; Figure 10 Schematic diagram of the transfer tube structure; Figure 11 Schematic diagram of the limiting ring structure.

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Protective cap, 2. Hidden needle sleeve, 2-1. Connecting rod section; 3. Medicine bottle holder, 4. Limiting ring, 4-1. Threaded hole, 4-2. First buckle, 4-3. Avoidance groove; 5. Screw, 6. Torsion spring, 7. Driving rod, 7-1. Second connecting rib, 7-2. Push rod, 7-3. Connecting rib; 8. Release ring, 8-1. Second buckle, 8-2. First connecting rib; 9. Double buckle, 9-1. Connecting ring, 9-2. Third buckle, 9-4. Spring; 10. Pen cap, 11. Housing, 11-1. Second snap slot, 11-2. Third snap slot, 11-3. First snap slot, 11-4. Observation window; 12. Transfer cylinder, 12-1, ratchet, 13. Pre-filled injection bottle, 14. Fixed card slot. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments of the present invention, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of the present invention. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0029] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0030] Example like Figures 1-11 As shown in the figure, a preferred embodiment of the present invention is a stored-energy automatic injection device, comprising: a housing 11, a stored-energy injection assembly, a transmission locking assembly, a pen cap 10 and a pre-filled injection bottle 13; Combine Figure 2-Figure 3 、 Figure 9 As shown, the housing 11 is sleeved on the outside of the transmission locking assembly, and the transmission locking assembly includes a hidden needle sleeve 2, a transmission cylinder 12 and a release ring 8; one end of the hidden needle sleeve 2 extends out of the top of the housing 11, and the other end of the hidden needle sleeve 2 is sequentially provided with a transmission cylinder 12 and a release ring 8; the inner wall of the release ring 8 is provided with a first clamping rib 8-2, and the outer wall of the release ring 8 is provided with a fixed clamping groove 14, and the inner wall of the housing 11 is provided with a locking rib, and the fixed clamping groove 11 is clamped with the locking rib; In some embodiments, the stored-energy automatic injection device further includes a protective cap 1 , which is connected to an end of the hidden needle sleeve 2 extending from the housing 11 to prevent accidental contact.

[0031] Combine Figure 5 、 Figure 8 、 Figure 11 As shown, the energy storage injection assembly includes a torsion spring 6, a drive rod 7, a screw 5 and a limiting ring 4; a second clamping rib 7-1 is provided on the side wall of the drive rod 7, the drive rod 7 is inserted into the release ring 8, and the first clamping rib 8-2 is clamped with the second clamping rib 7-1 in the circumferential direction; the limiting ring 4 is connected to the outer shell 11, and a threaded hole 4-1 is provided on the limiting ring 4; the drive rod 7 is connected to the torsion spring 6, and the bottom of the drive rod 7 is connected to the screw 5, and the screw 5 passes through the threaded hole 4-1 and abuts against the piston at the tail of the pre-filled injection bottle 13.

[0032] The inner wall of the bottom end of the driving rod 7 is provided with a connecting rib 7 - 3 , and the side wall of the screw rod 5 is provided with a connecting groove, and the screw rod 5 is connected to the connecting rib 7 - 3 on the driving rod 7 through the connecting groove.

[0033] One end of the torsion spring 6 is connected to the limiting ring 4, and the other end is connected to the driving rod 7. The torsion spring 6 drives the driving rod 7 to rotate, thereby causing the screw rod 5 connected to the driving rod 7 to move axially relative to the limiting ring 4.

[0034] The energy storage injection assembly is sleeved inside the transmission locking assembly, which is used to lock and release the energy storage injection assembly; that is, in the initial state, the fixed engaging groove 14 on the outer wall of the release ring 8 engages with the locking rib of the housing 11, and the housing 11 limits the circumferential rotation of the release ring 8 in the initial position. The drive rod 7 of the energy storage injection assembly is inserted into the release ring 8 and engages in the circumferential direction, further limiting the circumferential rotation of the drive rod 7. The torsion spring 6 completes energy storage and force accumulation during the product assembly process. Due to the above-mentioned limitation on circumferential rotation, the torsion spring 6 is always in a force storage state when not in use.

[0035] During injection, when the hidden needle sheath 2 contacts the skin and is pushed into the shell 11, the hidden needle sheath 2 drives the transfer cylinder 12 and the release ring 8 to move axially along the shell 11 in sequence. When the first clamping rib 8-2 of the release ring 8 is separated from the second clamping rib 7-1 of the drive rod 7, the torsion spring 6 on the drive rod 7 is no longer constrained, and its stored energy is released to drive the drive rod 7 to rotate. The drive rod 7 drives the bottom screw 5 to rotate, and the limiting ring 4 is in a fixed state relative to the shell 11, so that the screw 5 rotates to push the piston of the pre-filled injection bottle 13 to move, completing the automatic injection action.

[0036] Combine Figure 1As shown, the outer wall of the limiting ring 4 is provided with a first snap-on 4-2, and the side wall of the shell 11 is correspondingly provided with a first snap-on groove 11-3. The first snap-on 4-2 is engaged with the first snap-on groove 11-3 to fix the limiting ring 4 inside the shell 11.

[0037] During use, the limiting ring 4 is in a fixed state relative to the housing 11 , the screw 5 is engaged with the threaded hole 4 - 1 of the limiting ring 4 , and the driving rod 7 is driven to rotate by the torsion spring 6 , driving the screw 5 to rotate and move downward relative to the limiting ring 4 .

[0038] Combine Figure 4 As shown, the transmission locking assembly also includes a double buckle 9, which is arranged at the end of the release ring 8 away from the drive rod 7, and a connecting ring 9-1 is arranged inside the double buckle 9; the outer wall of the release ring 8 is provided with a second buckle 8-1, and the double buckle 9 is arranged on the outside of the release ring 8.

[0039] When the release ring 8 moves axially, the first clamping rib 8-2 of the release ring 8 separates from the second clamping rib 7-1 of the drive rod 7, the release ring 8 is inserted into the double buckle 9, and the second buckle 8-1 is clamped with the connecting ring 9-1, connecting the release ring 8 and the double buckle 9.

[0040] Combine Figure 1-Figure 2 、 Figure 5-Figure 7 As shown, the stored-energy automatic injection device further includes a pen cover 10, which is mounted on the rear end of the housing 11; a second snap-fit ​​groove 11-1 and a third snap-fit ​​groove 11-2 are sequentially provided on the side wall of the housing 11 at a certain distance from the rear end of the housing 11; The outer wall of the double buckle 9 is further provided with an elastic arm, on which a third buckle 9-2 is provided; in the initial state, the third buckle 9-2 is engaged with the second buckle groove 11-1; The transmission locking assembly also includes a spring 9 - 4 , one end of which abuts against the release ring 8 , and the other end abuts against the pen cover 10 .

[0041] Specifically, when the release ring 8 moves axially, it compresses the spring 9-4, storing energy in the spring 9-4. When the hidden needle sleeve 2 moves away from the skin, the spring 9-4 drives the release ring 8 to reset. Because the release ring 8 is inserted into and connected to the double buckle ring 9 during the retraction of the hidden needle sleeve 2, the spring 9-4 acts to simultaneously drive the double buckle ring 9 downward, disengaging the third buckle 9-2 from the second buckle groove 11-1 and securing it in the third buckle groove 11-2. The third buckle groove 11-2 restricts the rearward axial movement of the transmission locking assembly, preventing the reset hidden needle sleeve 2 from retracting into the housing 11, thereby achieving needle puncture protection.

[0042] Combine Figure 8 、 Figure 10As shown, the driving rod 7 is further provided with a shifting rod 7-2, and the shifting rod 7-2 is arranged around the circumference of the driving rod 7, and the driving rod 7 is sleeved inside the transmission cylinder 12; The inner wall of the transmission cylinder 12 is provided with a ratchet 12 - 1 , and the ratchet 12 - 1 is engaged with the shift rod 7 - 2 .

[0043] During the rotation and release process of the driving rod 7, the lever 7-2 rotates, deforms, and hits the ratchet 12-1 of the transfer cylinder 12, generating a "click-click" injection sound and vibration feedback, interactively reminding the user of the injection progress. When the "click-click" sound stops, it reminds the user that the injection progress is completed.

[0044] It should be noted that corresponding positions on the outer walls of the release ring 8, double buckle 9 and transfer cylinder 12 are all provided with fixed snap-fit ​​grooves 14 for snapping with the locking ribs on the inner wall of the shell 11 to limit the rotational movement of the above structure.

[0045] The hidden needle sleeve 2 includes a hidden needle segment and a connecting rod segment 2-1, wherein the hidden needle segment extends out of the top end of the housing 11; the stored-energy automatic injection device also includes a medicine bottle holder 3, which is disposed between the limiting ring 4 and the hidden needle sleeve 2 and is used to fix a pre-filled injection bottle 13; the needle end of the pre-filled injection bottle 13 passes through the medicine bottle holder 3 and extends into the hidden needle segment; The side walls of the medicine bottle holder 3 and the limiting ring are provided with an avoidance groove 4 - 3 . After the connecting rod 2 - 1 section passes through the avoidance groove 4 - 3 of the medicine bottle holder 3 and the limiting ring 4 in sequence, it abuts against the transfer cylinder 12 .

[0046] The side wall of the shell 11 is also provided with an observation window 11-4, and the observation window 11-4 is set at the position of the shell 11 corresponding to the medicine bottle holder 3; the observation window 11-4 is used to assist in observing whether the piston of the pre-filled injection bottle 13 moves to the bottom end; for the convenience of observation, the side wall of the medicine bottle holder 3 can be set to a hollow structure or made of transparent material.

[0047] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A stored energy automatic injection device, characterized in that: include: Housing, stored-energy injection assembly, transmission locking assembly, pen cap and pre-filled injection vial; The housing is sleeved on the outside of the transmission locking assembly, and the transmission locking assembly includes a hidden needle sleeve, a transmission cylinder and a release ring; one end of the hidden needle sleeve extends out of the top of the housing, and the other end of the hidden needle sleeve is sequentially provided with a transmission cylinder and a release ring; the inner wall of the release ring is provided with a first clamping rib, the outer wall of the release ring is provided with a fixed clamping groove, and the inner wall of the housing is provided with a locking rib, and the fixed clamping groove is clamped with the locking rib; The energy storage injection assembly includes an energy storage part, a driving rod, a screw and a limiting ring; a second clamping rib is provided on the side wall of the driving rod, the driving rod is inserted into the release ring, and the first clamping rib is clamped with the second clamping rib in the circumferential direction; the limiting ring is connected to the outer shell, and a threaded hole is provided on the limiting ring; the driving rod is connected to the energy storage part, and the driving rod is connected to the screw, and after the screw passes through the threaded hole, it abuts against the piston at the tail of the pre-filled injection bottle.

2. The stored-energy automatic injection device according to claim 1, characterized in that: The energy storage component is a torsion spring, one end of which is connected to the limiting ring, and the other end of which is connected to the driving rod.

3. The stored energy automatic injection device according to claim 2, characterized in that: The inner wall of the bottom end of the driving rod is provided with a connecting rib, and the side wall of the screw rod is provided with a connecting groove, and the screw rod is connected to the connecting rib on the driving rod through the connecting groove.

4. The stored-energy automatic injection device according to claim 1, characterized in that: The outer wall of the limiting ring is provided with a first buckle, and the side wall of the shell is correspondingly provided with a first buckle groove. The first buckle is engaged with the first buckle groove to fix the limiting ring inside the shell.

5. The stored-energy automatic injection device according to claim 1, characterized in that: The transmission locking assembly also includes a double buckle, which is arranged at one end of the release ring away from the drive rod, and a connecting ring is arranged inside the double buckle; a second buckle is provided on the outer wall of the release ring, and the double buckle is sleeved on the outside of the release ring.

6. The stored-energy automatic injection device according to claim 5, characterized in that: The stored-energy automatic injection device further includes a pen cover mounted on the rear end of the housing; a second snap-fit ​​groove and a third snap-fit ​​groove are sequentially provided on the side wall of the housing at a certain distance from the rear end of the housing; The outer wall of the double buckle is further provided with an elastic arm, on which a third buckle is provided; in an initial state, the third buckle is engaged with the second buckle groove; The transmission locking assembly further comprises a spring, one end of the spring abuts against the release ring, and the other end of the spring abuts against the pen cover.

7. The stored-energy automatic injection device according to claim 1, characterized in that: The driving rod is further provided with a shifting rod, which is arranged around the circumference of the driving rod, and the driving rod is sleeved inside the transmission cylinder; The inner wall of the transmission cylinder is provided with ratchet teeth, and the ratchet teeth are engaged with the shifting rod.

8. The stored-energy automatic injection device according to claim 1, characterized in that: The hidden needle sleeve includes a hidden needle section and a connecting rod section, wherein the hidden needle section extends out of the top end of the housing; the stored-energy automatic injection device also includes a medicine bottle holder, which is arranged between the limiting ring and the hidden needle sleeve and is used to fix the pre-filled injection bottle; the needle end of the pre-filled injection bottle passes through the medicine bottle holder and extends into the hidden needle section; The side walls of the medicine bottle holder and the limiting ring are provided with avoidance grooves, and the connecting rod section passes through the avoidance grooves of the medicine bottle holder and the limiting ring in sequence and then abuts against the transfer cylinder.

9. The stored-energy automatic injection device according to claim 8, characterized in that: The side wall of the shell is also provided with an observation window, which is arranged at a position of the shell corresponding to the medicine bottle holder; the observation window is used to assist in observing whether the piston of the pre-filled injection bottle moves to the bottom end; the side wall of the medicine bottle holder is a hollow structure or a transparent material.

Images