Double-cavity clamping type bottle injection pen

Abstract

The invention discloses a double-cavity clamping type bottle injection pen which is characterized in that a lower shell wraps the outer part of a double-cavity injection tube, and the upper part of the double-cavity injection tube is communicated with an injection push rod in the vertical direction; a first piston and a second piston are arranged in an inner cavity of the double-cavity injection tube, so that a first cavity is formed by the first piston and the bottom of the double-cavity injection tube, and a powder medicament or a liquid medicament A is contained in the first cavity; a closed second cavity is formed in the inner cavity of the double-cavity injection tube between the first piston and the second piston, and a liquid medicament B is contained in the second cavity; a communication bridge protruding outwards is arranged on the inner wall of the double-cavity injection tube, the first cavity and the second cavity can be communicated through the communication bridge by pushing the first piston and the second piston to move, and mixing of the medicine liquid B and the powder medicine or the liquid medicine A is achieved. Through the modular design, the double-cavity medicament injection function which is compact in structure and easy and convenient to operate is achieved, and the device is particularly suitable for biological agent or vaccine injection scenes needing on-site mixing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a double-cavity card type bottle injection pen. BACKGROUND

[0002] In the modern medical field, the effective components of many drugs need to be stored in powder and liquid or two different liquids respectively until mixed before use to ensure the stability of the drug efficacy. For example, penicillin in antibiotic drugs and some vaccine preparations or other drugs, the active ingredients of which are prone to degradation in a liquid environment, must be packaged in the form of "powder + solvent" or double-liquid packaging. Although such packaging can solve the stability problem of the drug, it still faces challenges such as complicated operation, insufficient mixing accuracy, high risk of pollution, or infection risk in clinical use.

[0003] The traditional two-component drug use process usually needs to be manually completed by medical staff or patients through a plurality of steps such as "dissolving liquid extraction, powder bottle injection, shaking mixing, and re-extraction" or "extraction from bottle A, injection of drug from bottle B, shaking mixing, and re-extraction". In this process, not only additional syringes, needles, and adapter devices are needed, but also the following problems may be caused by improper operation: 1. deviation of mixing ratio, especially for chemotherapy drugs or biological preparations that need to be accurately controlled, manual operation is prone to cause dosage errors; 2. pollution risk, during the multiple puncture and transfer processes, external microorganisms may invade the drug, increasing the risk of infection; 3. high operation threshold, which requires higher requirements for medical staff; for patients at home (such as patients with autoimmune diseases), the complex mixing steps may lead to a decrease in use compliance, and even misoperation. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a double-cavity card type bottle injection pen, which solves the above technical problems existing in the prior art.

[0005] The purpose of the present application can be achieved by the following technical solutions: A double-cavity card type bottle injection pen, comprising an upper pen shell, a lower shell, a pen cap, a first trigger, a trigger rod, a second trigger, an injection push rod, and a double-cavity injection tube. The upper pen shell and the lower shell are snap-connected to form a closed cavity, which wraps the internal components; the pen cap is sleeved on the outside of the lower shell. The first trigger is located at the top of the upper pen shell and is locked with the trigger rod inside the upper pen shell; in the non-trigger state, a first spring is arranged between the top of the trigger rod and the first trigger and is in the compressed state; in the trigger state, the first trigger is rotated to be separated from the trigger rod, the first spring is released and the trigger rod generates a downward impact force, which synchronously drives the injection push rod below; The second trigger is arranged through the through hole in the middle of the upper pen shell in the horizontal direction, and at least one set of communication ports is arranged in the middle of the second trigger in the vertical direction, which is symmetrically arranged on both sides of the middle line to realize the horizontal reciprocating rebound movement; by adjusting the relative position of the communication ports, whether the locking part on the trigger rod can pass through the communication ports in the vertical direction can be controlled. The lower shell forms an outer package of the double-cavity injection tube, the upper part of the double-cavity injection tube is in communication with the injection push rod in the vertical direction; the inner cavity of the double-cavity injection tube is provided with a first piston and a second piston, so that the first piston and the bottom of the double-cavity injection tube form a first cavity, the first cavity contains a powder medicament or an A liquid medicament; the inner cavity of the double-cavity injection tube between the first piston and the second piston forms a closed second cavity, the second cavity contains a B liquid medicament; the inner wall of the double-cavity injection tube is provided with a communication bridge protruding outward, by pushing the second piston to move, the movement of the B liquid medicament and the first piston can be driven, so that the first cavity and the second cavity are communicated through the communication bridge.

[0006] Further, the second trigger includes two sets of plug-in locking pins and a reset part between the locking pins, and a communication port is arranged in the middle of the locking pins in the vertical direction; When the reset part is in the released state, the communication port is misaligned with the locking part below to realize the blocking and limiting in the vertical direction, and when the reset part is compressed, the communication port forms a channel for the locking part to pass through below.

[0007] Further, the reset part is a mechanical reset part.

[0008] Further, a bearing table is formed in the upper pen shell where the through hole is located, the middle of the bearing table forms a channel for the trigger rod and the locking part to pass through, and the bearing table forms a bottom support for the second trigger.

[0009] Further, a second spring is arranged on the top of the injection push rod below the bearing table, so that the injection push rod generates a downward impact force when the top of the injection push rod is triggered.

[0010] Further, the middle of the trigger rod forms a hollow groove, the second trigger passes through the hollow groove, and the height of the hollow groove in the vertical direction is the movement stroke of the trigger rod in the vertical direction.

[0011] Further, the lock piece includes at least one leg, and the height of the leg is less than the movement stroke height of the hollow groove, and when the leg contacts the second trigger and forms the first position limiting, the first chamber and the second chamber are in communication and then sealed again.

[0012] Further, a notch is formed in the upper inner side of the leg of the lock piece, and when the lock piece moves to the upper stroke range, the second trigger is reset to both sides by the rebound elastic force in the middle, and the notch forms the lock to limit the position of the lock piece in the vertical direction.

[0013] Further, the inner wall in the middle of the first trigger is provided with a hook, and the hook is in the inner groove of the top of the trigger rod to form the locking, and the hook and the inner groove are unlocked by rotating the first trigger to release the position limiting of the trigger rod.

[0014] The beneficial effects of the present application are: 1. The device integrates the mixing and injection processes of the medicaments into the coherent action of "rotation-mixing-pressing" through the cooperation of the first trigger and the second trigger, without the need for additional instruments. Especially for home patients or non-professional medical personnel, the operation threshold can be greatly reduced, the problem of reduced use compliance caused by complicated steps can be reduced, the average operation time can be shortened from 3-5 minutes to within 30 seconds, and the use efficiency can be significantly improved.

[0015] 2. The device realizes the step-by-step triggering mechanism of "mixing first and then injecting" through the position limiting design of the lock piece and the second trigger: when the first position limiting is ensured, the two chambers are completely connected through the communication bridge, and after the B liquid medicament is injected into the first chamber and mixed with the powder medicament or A liquid medicament, the second position limiting is sealed; after the mixing is sufficient, the injection is performed by pressing the second trigger, which avoids the complicated process of traditional devices such as liquid extraction-liquid injection-mixing-liquid extraction-injection, reduces the risk of infection, reduces the risk of local irritation caused by the injection of granular drugs, and ensures the stable play of the drug effect.

[0016] 3. After the injection is completed, the lock piece and the second trigger form irreversible locking through the notch, and the upper and lower shells are designed as non-detachable buckles, which completely eliminates the cross-infection risk caused by repeated use; secondly, the piston pushing distance is accurately controlled through the double-spring staged energy storage and position limiting mechanism to avoid dose error; thirdly, the closed design of the upper pen shell and the lower shell reduces the contact between the medicaments and the external environment, reduces the pollution probability, and is especially suitable for biological preparation and vaccine injection scenes with strict aseptic requirements.

[0017] 4, The device adopts modular design, and the double-cavity injection tube can adapt to the existing standard cassette bottle specifications, facilitating industrial production and clinical promotion. Its compact shape (length ≤ 15 cm) is suitable for carrying on the body, which not only meets the needs of routine diagnosis and treatment in hospitals, but also is suitable for emergency scenes such as field rescue and battlefield rescue, and can complete the drug administration operation in a short time, so as to save valuable treatment time for emergency patients. At the same time, for patients with autoimmune diseases, tumors and other long-term home treatment, the device can reduce the dependence on professional medical personnel and improve the self-care ability of patients. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 is the overall structure schematic diagram of the double-cavity cassette bottle injection pen of the embodiment of the present application; Figure 2 is the overall structure schematic diagram of the upper pen shell of the embodiment of the present application; Figure 3 is the cross-sectional structure schematic diagram of the upper pen shell of the embodiment of the present application; Figure 4 is the structure schematic diagram of the first trigger of the embodiment of the present application; Figure 5 is the structure schematic diagram of the trigger rod of the embodiment of the present application; Figure 6 is the structure schematic diagram of the lock catch of the embodiment of the present application; Figure 7 is the cross-sectional structure schematic diagram of the second trigger of the embodiment of the present application; Figure 8 is the structure schematic diagram of the latch of the embodiment of the present application; Figure 9 is the structure schematic diagram of the injection push rod of the embodiment of the present application; Figure 10 is the structure schematic diagram of the double-cavity injection tube of the embodiment of the present application; Figure 11 is the cross-sectional structure schematic diagram of the pre-preparation state of the embodiment of the present application; Figure 12 is the cross-sectional structure schematic diagram of the double-cavity injection tube of the embodiment of the present application; Figure 13 is the cross-sectional structure schematic diagram of the medicament mixing stage of the embodiment of the present application; Figure 14 is the cross-sectional structure schematic diagram of the injection stage of the embodiment of the present application; Figure 15 is an embodiment of the present application Figure 14 is a partial structural schematic diagram of the present application DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0021] As shown in Figure 1 , the present application provides a double-cavity cassette bottle injection pen, mainly used for realizing on-site mixing and injection of powder medicament or A liquid medicament and B liquid medicament, and the structure thereof comprises: As shown in Figure 2 , Figure 11 , the upper pen shell 1 and the lower shell 2 are both made of medical-grade ABS plastic injection molding, connected through a buckle structure, and together form a closed cavity to protect the internal components. The upper pen shell 1 is provided with a circular opening at the top for mounting the first trigger 100, and a through hole 110 is horizontally provided in the middle. The lower pen shell 2 is provided with a stepped hole at the bottom for exposing the double-cavity injection tube 400, and a pen cap 3 is provided on the outer wall of the lower pen shell 2, which can protect the outer wall of the lower pen shell 2 through the pen cap 3.

[0022] As shown in Figure 4 , the first trigger 100 is a cylindrical knob with anti-slip patterns on the top, and two elastic hooks 130 are symmetrically arranged in the middle of the inner wall. The first trigger 100 is matched with the top of the upper pen shell 1 through a rotary damping structure, and the rotation angle is limited to 60° to ensure clear operation feel.

[0023] As shown in Figure 5 , the trigger rod 101 is made of POM material, and the top is provided with an annular inner groove 1012 matched with the hook 130. A rectangular hollow groove 1011 is provided in the middle along the axial direction, and the groove height is 25 mm corresponding to the maximum stroke of the trigger rod. As shown in Figure 6 , the lock catch 103 is fixed on the top of the trigger rod through interference fit, and two legs 1031 are symmetrically arranged on both sides, and a notch 1032 is provided on the inner side of the end of the leg 1031.

[0024] As shown in Figure 7As shown, the second actuating element 200 consists of two sets of symmetrical pins 201 and a reset element 202 (the reset element 202 is a mechanical reset element; as long as it achieves the reset function, it is within the scope of protection of this application). The pins are made of POM material (good self-lubricating properties), and a connecting port 210 matching the support leg 1031 of the locking element 103 is opened in the middle. In its natural state, the reset element 202 allows the two sets of pins 201 (such as...) to... Figure 8 As shown, the connector 210 remains open outwards, and the connecting port 210 is misaligned with the support leg 1031 of the locking member 103. Pressing the two ends of the compressible reset member 202 of the pin 210 aligns the connecting port 210 with the support leg 1031 of the locking member 103, thereby enabling the support leg 1031 of the locking member 103 to continue to move downwards through the connecting port 210.

[0025] like Figure 9 As shown, the injection push rod 300 is connected to the excitation rod 101 at the top and contacts the second piston 402 at the bottom.

[0026] like Figure 10 , Figure 12 As shown, the dual-lumen injection tube 400 is made of neutral borosilicate glass, with two crescent-shaped connecting bridges 430 symmetrically arranged on the inner wall at 1 / 3 of the distance from the bottom (the specific dimensions of these bridges can be customized and are not fixed; the connecting bridges 430 and the dual-lumen injection tube 400 are integrally formed with an internal groove structure). The first piston 401 and the second piston 402 are both made of butyl rubber. The volumes of the first chamber 410 and the second chamber 420 can be adjusted (by adjusting the relative positions of the first piston 401 and the second piston 402 within the inner cavity of the dual-lumen injection tube 400 according to the actual dosage of the drug, thereby adjusting the volume of the first chamber 410 and the second chamber 420).

[0027] Auxiliary components: The first spring 102 is a compression spring with a diameter of 8mm and a free length of 25mm, and the second spring 104 is sleeved on the lower part of the excitation rod (diameter of 12mm and free length of 40mm). Both are made of medical-grade stainless steel wire.

[0028] The working process of this injection pen is divided into three stages: pre-preparation state → drug mixing → injection completion, as detailed below: I. For example Figure 11 As shown, pre-ready state The first excitation element 100 is locked to the inner groove 1012 of the excitation rod 101 by the hook 130, and the first spring 102 is in a compressed state (first energy storage).

[0029] The reset spring 202 of the second trigger 200 extends naturally, and the connecting ports 210 of the two sets of pins 201 are misaligned, forming a vertical block on the support leg 1031 of the locking member 103.

[0030] In the double chamber injection tube 400, the first piston 401 is above the communication bridge 430, the second piston 402 is above the first piston 401 and the bottom surface of the injection push rod 300 (in the schematic diagram, the piston 402 is pushed to the top), the two chambers are isolated (the powder medicine or the A liquid medicine and the B liquid medicine are not in contact).

[0031] II. As shown in Figure 13 the medicine mixing stage Step 1: remove the cap 3.

[0032] Step 2: rotate the first trigger 100, the catch 130 is disengaged from the inner groove 1012, the first spring 102 releases the elastic potential energy, pushes the trigger rod 101 and the injection push rod 300 downward, thereby pushing the second piston 402 downward, synchronously pushing the B liquid medicine and the first piston 401 downward, when the first piston 401 reaches the position of the communication bridge 430, the B liquid medicine in the second chamber is injected into the first chamber 410 through the communication bridge, and the B liquid medicine and the powder medicine (or the A liquid medicine) begin to mix. At the same time, under the action of the first spring 102, the trigger rod continues to push the second piston 402 downward, when the B liquid medicine in the second chamber is completely injected into the first chamber, the second piston 402 and the first piston 401 are attached together, and continue to move downward, the first piston 401 passes through the communication bridge 430, seals the first chamber, and at this time the bottom of the leg 1031 contacts the upper surface of the latch 201 for the first time, the trigger rod 101 stops moving, and at the same time, the injection pen is gently shaken to fully mix the medicine.

[0033] III. As shown in Figure 14 , Figure 15 the injection stage Step 1: install the appropriate needle at the bottom and insert it into the injection site and hold it.

[0034] Step 2: press the two ends of the second trigger 200 with the thumb and index finger at the same time, the latch 201 is compressed, the reset piece 202 moves horizontally, the two sets of communication ports 210 and 103 are aligned to form a vertical channel and release the restriction on the leg 1031. The compressed second spring 104 begins to release kinetic energy, so that the trigger rod 101 drives the lock piece 103 to move downward synchronously, the leg 1031 passes through the communication port 210, and at the same time, the injection push rod 300 moves downward, pushing the second piston 402 and the first piston 401 to move, injecting the mixed medicine. When the injection push rod 300 advances to the upper limit of the hollow groove 1011 of the maximum stroke of the trigger rod 101, the mixed medicine is completely injected.

[0035] Third step: the user releases the second trigger 200, the reset spring 202 pushes the latch 201 to reset, at this time the leg 1031 of the lock catch 103 has entered the upper area of the hollow groove 1011, the lock catch 103 is lowered and gradually enters the middle→lower area of the hollow groove 1011, the edge of the latch 201 is clamped into the notch 1032 of the leg 1031, forming a lock to prevent the trigger rod 101 from rebounding.

[0036] Fourth step: pull out the injection pen, put on the needle protection cap and remove the needle.

[0037] Core design principle Two-stage trigger mechanism: through the synergistic effect of the first trigger 100 and the second trigger 200, it is ensured that the medicaments are mixed before injection, avoiding direct injection of un-mixed medicaments.

[0038] Mechanical limit protection: the lock catch 103 is locked with the communication port 210 of the second trigger 200, realizing the safety design of "one-time use and locking" and the upper and lower shells cannot be disassembled, preventing cross infection caused by repeated use.

[0039] Energy release in stages: the first spring 102 provides initial power to realize chamber communication, and the second spring 104 provides continuous thrust to complete injection, and two-stage energy output matches the power demand of different stages.

[0040] Visual operation feedback: the lower pen shell 2 is a transparent piece, through the displacement of the injection push rod 300 and the scale on the lower shell 2, the user can intuitively judge the mixing progress and injection amount, improving the convenience of use.

[0041] The embodiment realizes the double-cavity medicament injection function with compact structure and simple operation through modular design, and is especially suitable for biological preparation or vaccine injection scenes that need to be mixed on site.

[0042] The basic principles, main features and advantages of the present application are shown and described. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A dual-chamber cartridge injection pen, characterized in that, It includes an upper pen shell (1), a lower shell (2), a pen cap (3), a first excitation element (100), an excitation rod (101), a second excitation element (200), an injection push rod (300), and a dual-lumen injection tube (400). The upper pen shell (1) and the lower shell (2) are snapped together to form a closed cavity, which encloses the internal components; the pen cap (3) is fitted onto the outside of the lower shell (2); The first actuating element (100) is located at the top of the upper pen shell (1) and is interlocked with the actuating rod (101) located inside the upper pen shell (1). In the non-triggered state, a first spring (102) is provided between the top of the actuating rod (101) and the first actuating element (100) and is in a compressed state. In the triggered state, by rotating the first actuating element (100) to disengage it from the actuating rod (101), the first spring (102) is released and the actuating rod (101) generates a downward impact force, which simultaneously drives the injection push rod (300) located below. The second exciter (200) is provided through the transverse through hole (110) in the middle of the upper pen shell (1), and the middle of the second exciter (200) is provided with at least one set of connecting ports (210) in the vertical direction, and its two sides are symmetrically arranged with the center line to realize the transverse reciprocating spring movement; by adjusting the relative position of the connecting ports (210), it is possible to control whether the locking member (103) located on the exciter rod (101) can pass through the connecting port (210) in the vertical direction. The lower housing (2) forms an outer enclosure for the dual-lumen injection tube (400), the upper part of the dual-lumen injection tube (400) is vertically connected to the injection push rod (300); the inner cavity of the dual-lumen injection tube (400) is provided with a first piston (401) and a second piston (402), so that the first piston (401) and the bottom of the dual-lumen injection tube (400) form a first chamber (410), the first chamber (410) contains powdered medicine or liquid medicine A; the first piston (401) 01) The inner cavity of the double-lumen injection tube (400) between the second piston (402) and the second piston (402) forms a closed second chamber (420), which contains liquid agent B. The inner wall of the double-lumen injection tube (400) is provided with an outwardly protruding connecting bridge (430). By pushing the second piston (402) to move, the liquid agent B and the first piston (401) are pushed to move, so that the first chamber (410) and the second chamber (420) can be connected through the connecting bridge (430).

2. The dual-chamber cartridge injection pen according to claim 1, characterized in that, The second activator (200) includes two sets of interlocking pins (201) and a reset member (202) located between the pins (201), and a communication port (210) is provided in the middle of the pins (201) in the vertical direction. When the reset member (202) is in the released state, the connecting port (210) and the lower part of the locking member (103) are misaligned to achieve vertical blocking and limiting. When the reset member (202) is compressed, the connecting port (210) forms a channel for the locking member (103) to pass through from below.

3. The dual-chamber cartridge injection pen according to claim 2, characterized in that, The reset component (202) is a mechanical reset component.

4. The dual-chamber cartridge injection pen according to claim 2, characterized in that, A support platform (120) is formed inside the upper pen shell (1) where the through hole (110) is located. A channel for the excitation rod (101) and the locking member (103) to pass through is formed in the middle of the support platform (120). At the same time, the support platform (120) forms a bottom support for the second excitation member (200).

5. The dual-chamber cartridge injection pen according to claim 4, characterized in that, A second spring (104) is fitted on the outer side of the top of the injection push rod (300) located below the support platform (120), so that the top of the injection push rod (300) generates a downward impact force when it is activated.

6. The dual-chamber cartridge injection pen according to claim 2, characterized in that, A hollow groove (1011) is formed in the middle of the excitation rod (101), and the second excitation element (200) passes through the hollow groove (1011). The height of the hollow groove (1011) in the vertical direction is the stroke of the excitation rod (101) in the vertical direction.

7. The dual-chamber cartridge injection pen according to claim 6, characterized in that, The locking element (103) includes at least one support leg (1031), and the height of the support leg (1031) is less than the travel height of the hollow groove (1011). When the support leg (1031) contacts the second excitation element (200) and forms the first limit, the first chamber (410) and the second chamber (420) are connected and closed again.

8. The dual-chamber cartridge injection pen according to claim 7, characterized in that, A slot (1032) is provided on the upper inner side of the support leg (1031) of the locking member (103). When the locking member (103) moves to the upper stroke range, the second excitation member (200) is reset to both sides in the middle by the rebound force and forms a lock with the slot (1032) to realize the position limit and fixation of the locking member (103) in the vertical direction.

9. The dual-chamber cartridge injection pen according to claim 1, characterized in that, The first exciter (100) is provided with a hook (130) in the middle of the inner wall. The hook (130) and the inner groove (1012) that is offset from the top of the exciter (101) are locked together. By rotating the first exciter (100), the hook (130) and the inner groove (1012) can be unlocked, so that the limit of the exciter (101) is released.

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