Injection device

Abstract

The invention relates to an injection device, which belongs to the technical field of medical equipment and comprises a shell, an activation button is arranged on the upper surface of the shell, an adhesive tape liner is arranged on the lower surface of the shell, a needle puncture structure and a medicine infusion structure are arranged in the shell, and the adhesive tape liner is used for adhering the injection device to the body of a user. The activation button is used for driving the needle puncture structure to puncture the injection needle into the skin for subcutaneous infusion, the medicine infusion structure is used for storing medicine and driving the medicine to enter the injection needle, and the technical problems that in the prior art, the movement freedom degree of a patient is limited, the nursing workload of medical staff is increased, and the puncture risk exists can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical equipment, and in particular relates to an injection device. Background Art

[0002] Disposable portable infusion pumps (non-electrically driven, hereinafter referred to as "mechanical pumps") are widely used in clinical micro-fluid administration. They enable continuous, slow infusion of medications and are suitable for patients requiring long-term, low-flow medication administration. These pumps typically consist of a pump body, a medication filter, a flow limiting device, an infusion line, and terminal connectors. They offer advantages such as compact structure, small size, light weight, and portability.

[0003] However, in actual clinical applications, existing mechanical pumps still have certain limitations and inconveniences. First, in order to ensure the stability of the drug infusion flow rate, the pump body and the terminal connector need to remain in a basically horizontal state during use, which to a certain extent limits the patient's freedom of movement; at the same time, due to the use of traditional intravenous infusion methods, the patient may cause traction on the infusion site or even venous damage during movement, affecting the safety and comfort of treatment. Secondly, the beginning and end of the entire infusion process must be completed manually by medical staff, which not only increases the workload of nursing, but also poses the risk of needle stick injuries and blood contamination during puncture and needle removal, becoming a common occupational exposure hazard for nursing staff.

[0004] Therefore, there is an urgent need to optimize the structure and improve the function of the existing disposable portable mechanical infusion pump. Summary of the Invention

[0005] In view of the various deficiencies of the prior art, an injection device is proposed, comprising a housing, an activation button provided on its upper surface, a tape pad provided on its lower surface, and a needle puncture structure provided inside the housing, the needle puncture structure comprising: an injection needle movable between a retracted position and an injection position; A limiter having an elastic deformation function, which can evolve between an initial posture and a limit posture; and a delivery assembly, which is connected to the activation button and the injection needle respectively; When the activation button is pressed, the return spring is compressed, and the delivery component cooperates with the limit member in the limit posture, so that the tip of the injection needle extends to the outside of the shell. At this time, the injection needle remains in the injection position; when the activation button is pressed again, the delivery component rotates one position, or the limit member evolves to the initial posture by itself, and the return spring changes from the compressed state to the initial state, so that the tip of the injection needle retracts into the inside of the shell. At this time, the injection needle remains in the retracted position.

[0006] The technical solution is further configured such that a button sliding channel is provided on the upper surface, a first guide groove is provided on the button sliding channel, and a first guide block that can slide along the first guide groove is provided on the outer surface of the activation button.

[0007] The technical solution is further configured such that the delivery assembly includes a turntable and a sliding bracket, the turntable is sleeved inside the sliding bracket, the sliding bracket is connected to the activation button, a pawl is provided at the bottom of the sliding bracket along its circumference, and a wedge-shaped block is provided at the bottom of the turntable to abut against the pawl; Pressing the activation button causes the sliding bracket to move downward along its central axis, and the pawl applies pressure to the wedge block, causing the turntable, the sliding bracket and the injection needle to move downward synchronously, and the tip of the injection needle gradually extends to the outside of the shell.

[0008] The technical solution is further configured as follows: an anti-slip hook is provided on the sliding bracket, a through hole is provided on the top of the turntable, and the anti-slip hook passes through the through hole and extends to the inside of the turntable.

[0009] The present technical solution is further configured such that the delivery component also includes a guide bracket arranged on the periphery of the sliding bracket, the guide bracket is provided with a second guide groove and an inner groove, the outer surface of the sliding bracket is provided with a second guide block that can slide along the inner groove, and the wedge block slides along the second guide groove.

[0010] The technical solution is further configured such that a liquid storage bag is provided inside the shell, the liquid storage bag has an elastic deformation function, and the limiting member is located on the side of the liquid storage bag; When no liquid medicine is injected into the liquid storage bag, the limiting member remains in the initial posture; after the liquid medicine is injected into the liquid storage bag, as the amount of injected liquid medicine increases, the liquid storage bag expands and undergoes elastic deformation, and the deformation pushes the limiting member to evolve to the limiting posture. During the process of synchronous downward movement of the turntable and the sliding bracket, the limiting member in the limiting posture can clamp the wedge block, and at this time, the injection needle remains in the injection position.

[0011] The technical solution is further configured such that a wedge-shaped tooth is provided between two adjacent second guide grooves, and the shape of the wedge-shaped tooth is adapted to the shape of the wedge-shaped block; When the injection needle remains in the injection position, after pressing the activation button again, the wedge block moves down to the end of the second guide groove, and the pawl pushes the wedge block to slide along the wedge teeth into the other second guide groove, so that the turntable rotates relative to the sliding bracket, and the clamping limit of the wedge block by the limiting member is released.

[0012] The technical solution is further configured as follows: the turntable includes an inner turntable cylinder and an outer turntable cylinder which are nested with each other; a return spring is provided between the inner turntable cylinder and the outer turntable cylinder; and ends of the return spring respectively abut against the lower surface and the top of the turntable.

[0013] The technical solution is further configured such that a filling port is provided on the lower surface, a one-way valve communicating with the filling port is provided inside the shell, the one-way valve is communicated with the liquid storage bag through a liquid inlet pipe, and a filter membrane is provided inside the one-way valve. The technical solution is further configured such that the liquid storage bag is connected to the manifold, a connecting pipe is provided at the end of the manifold, and the bottom of the injection needle extends to the inside of the connecting pipe through the inner rotating disk; When the injection needle moves down until the side hole above it is connected to the manifold pipeline, the drug solution can enter the injection needle through the side hole.

[0014] The beneficial effects of the present invention are: 1. By pressing the activation button, the user can start and end the infusion by themselves, without the need for medical staff to assist in the operation, thus reducing the nursing workload of medical staff; subcutaneous infusion is adopted, and at the same time, the shell can be applied to the user's abdomen with an adhesive. The user can move freely during the infusion process, which can not only free the user from body position restrictions, but also greatly reduce the risk of puncture point injury caused by movement; at the end of the infusion, the tip of the injection needle retracts into the shell, completely avoiding the exposure of the steel needle and eliminating the risk of needlestick injuries from the root.

[0015] 2. The dual-mode end mechanism allows users to end the infusion at any time by activating the button, giving users absolute control and improving treatment safety. The reservoir state is linked to the reset shrapnel posture. When the infusion ends, the drug liquid returns to zero, the limiter automatically evolves to the initial posture, and the activation button automatically resets, eliminating drug residue and ensuring accurate dosage. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an isometric view of an injection device according to an embodiment of the present invention; Figure 2 A bottom view of the injection device according to an embodiment of the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 An exploded view of an injection device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of an injection device with the upper housing omitted in an embodiment of the present invention; Figure 6 for Figure 5 A top view of Figure 7 for Figure 6Middle BB cross-section; Figure 8 An exploded view of the upper housing and activation button in an embodiment of the present invention; Figure 9 This is a schematic diagram of the upper housing in an embodiment of the present invention; Figure 10 Schematic diagram of the assembly of the turntable, the sliding bracket and the guide bracket in an embodiment of the present invention; Figure 11 An exploded view of a turntable, a sliding bracket, and a guide bracket in an embodiment of the present invention; Figure 12 is a schematic diagram of a sliding bracket according to an embodiment of the present invention; Figure 13 is a schematic diagram of a turntable in an embodiment of the present invention; Figure 14 is a schematic diagram of the lower housing in an embodiment of the present invention; Figure 15 Schematic diagram of a limiting member in an embodiment of the present invention.

[0016] In the drawings: 100, housing; 101, upper housing; 1011, button sliding channel; 1012, partition plate; 1013, first guide groove; 102, lower housing; 1021, filling port; 1022, dispensing port; 200, activation button; 201, first guide block; 300, safety pin; 400, liquid reservoir; 500, turntable; 501, inner turntable cylinder; 502, outer turntable cylinder; 503, wedge block; 600, sliding bracket; 601, pawl; 602, second guide block; 603, anti-drop hook; 700, guide bracket; 701, second guide groove; 702, wedge-shaped tooth; 800, base; 900, one-way valve; 901, filter membrane; 110, injection needle; 120, return spring; 130, limiter; 1301, arc-shaped portion; 1302, first bending portion; 1303, second bending portion; 160, return spring base; 170, first exhaust valve; 180, manifold; 190, connecting pipe. DETAILED DESCRIPTION

[0017] 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 in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. 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.

[0018] According to an embodiment of the present invention, an injection device is provided. Figures 1 to 4 , comprising a housing 100, an activation button 200 being provided on its upper surface, a tape pad being provided on its lower surface, and a needle puncture structure being provided inside thereof, the needle puncture structure comprising: an injection needle 110 , which is movable between a retracted position and an injection position; The limiting member 130 has an elastic deformation function and can evolve between an initial posture and a limiting posture; and a delivery assembly, which is connected to the activation button 200 and the injection needle 110 respectively.

[0019] Furthermore, the housing 100 is disc-shaped and includes an upper housing 101 and a lower housing 102, which are snap-fitted together. The upper housing 101 has an upper surface, and the lower housing 102 has a lower surface. The lower surface is provided with a dispensing port 1022 for the tip of the injection needle 110 to pass through. Specifically, the housing 100 can be made of a transparent material to facilitate observation of the internal components of the housing 100.

[0020] Furthermore, an adhesive is provided on the lower housing 102 for temporarily securing the injection device to the user's body (e.g., abdomen) prior to injection. This allows the user to move freely during the infusion process, freeing them from positional constraints while significantly reducing the risk of injury to the puncture site caused by movement. A tape liner is bonded to the surface of the adhesive, which can be removed to expose the adhesive.

[0021] Furthermore, the activation button 200 protrudes from the upper housing 101 and the two are movably connected to facilitate a pressing operation. The activation button 200 is used to drive the needle puncture structure to pierce the injection needle 110 into the skin for subcutaneous infusion.

[0022] By pressing the activation button 200, the return spring 120 is compressed, and the delivery assembly cooperates with the limiter 130 in the limit position, so that the tip of the injection needle 110 extends outside the housing 100. At this time, the injection needle 110 remains in the injection position. By pressing the activation button 200 again, the delivery assembly rotates one position, or the limiter 130 automatically evolves to the initial position, and the return spring 120 changes from the compressed state to the initial state, so that the tip of the injection needle 110 retracts into the interior of the housing 100. At this time, the injection needle 110 remains in the retracted position. In other words, by pressing the activation button 200, the user can start and end the infusion by themselves without the need for medical staff to perform auxiliary operations, thereby reducing the nursing workload of medical staff. At the end of the infusion, the tip of the injection needle 110 retracts into the interior of the housing 100, completely avoiding the exposure of the steel needle and eliminating the risk of needlestick injuries from the root.

[0023] In an injection device of this embodiment, please refer to Figures 1 to 9 The upper surface is provided with a button sliding channel 1011, the button sliding channel 1011 is provided with a first guide groove 1013, and the outer surface of the activation button 200 is provided with a first guide block 201 that can slide along the first guide groove 1013.

[0024] Furthermore, the button sliding channel 1011 is set to be cylindrical, and a plurality of spacer plates 1012 are arranged along its circumference inside. Adjacent spacer plates 1012 are arranged at intervals to form the first guide groove 1013 extending along the vertical direction, and a flange is provided at the bottom of the spacer plate 1012.

[0025] Furthermore, the number of the first guide blocks 201 is equal to the number of the first guide grooves 1013 . Meanwhile, the top of the first guide block 201 is configured as an inclined surface to facilitate assembly of the first guide block 201 into the first guide groove 1013 .

[0026] In an injection device of this embodiment, please refer to Figures 1 to 13 The delivery component includes a turntable 500 and a sliding bracket 600. The turntable 500 is mounted inside the sliding bracket 600. The top of the sliding bracket 600 is connected to the activation button 200. The bottom of the sliding bracket 600 is provided with a pawl 601 along its circumference. The bottom of the turntable 500 is provided with a wedge block 503 that abuts against the pawl 601.

[0027] Pressing the activation button 200 causes the sliding bracket 600 to move downward along its central axis, and the pawl 601 applies pressure to the wedge block 503, causing the turntable 500, the sliding bracket 600 and the injection needle 110 to move downward synchronously, and the tip of the injection needle 110 gradually extends to the outside of the housing 100.

[0028] In an injection device of this embodiment, please refer to Figures 1 to 13 The sliding bracket 600 is provided with an anti-drop hook 603, and the top of the turntable 500 is provided with a through hole, and the anti-drop hook 603 passes through the through hole and extends to the inside of the turntable 500. This structural design can prevent the sliding bracket 600 and the turntable 500 from slipping.

[0029] In an injection device of this embodiment, please refer to Figures 1 to 13 The delivery component also includes a guide bracket 700 that is sleeved on the periphery of the sliding bracket 600. The guide bracket 700 is provided with a second guide groove 701 and an inner groove. The outer surface of the sliding bracket 600 is provided with a second guide block 602 that can slide along the inner groove, and the wedge block 503 slides along the second guide groove 701.

[0030] Furthermore, the guide bracket 700 is configured as a cylindrical frame structure, with a portion of the inner surface of its side wall recessed toward its outer surface to form the inner groove, and a second guide groove 701 is provided on the side wall. The second guide block 602 is provided corresponding to the wedge block 503. As the second guide block 602 slides along the inner groove, the pawl 601 applies pressure to the wedge block 503, causing the wedge block 503 to slide along the second guide groove 701.

[0031] In an injection device of this embodiment, please refer to Figures 1 to 7 ,as well as Figure 14 A drug infusion structure is also provided inside the housing 100 , and the drug infusion structure is used to store drugs and drive the drugs into the injection needle 110 .

[0032] Furthermore, the drug infusion structure includes: The reservoir 400 is capable of storing drugs and delivering the drugs through its deformation function; a one-way valve 900 that filters and delivers the drug into the reservoir 400; The manifold 180 is used to connect the drug to the side hole of the injection needle 110 .

[0033] Specifically, the liquid storage capsule 400 has an elastic deformation function, and the limiting component 130 is located on the side of the liquid storage capsule 400 .

[0034] Furthermore, the bottom surface of the housing 100 is provided with a filling port 1021. The housing 100 is internally provided with the one-way valve 900, which is in communication with the filling port 1021. The one-way valve 900 is in communication with the liquid reservoir 400 via a liquid inlet tube. The one-way valve 900 is in communication with the liquid medicine transfer device. As the liquid medicine flows through the one-way valve 900, it is filtered through a filter membrane 901. The liquid medicine then enters the liquid reservoir 400. A first exhaust valve 170 is provided at the rear end of the liquid reservoir 400. Gas in the one-way valve 900 and the liquid reservoir 400 can be discharged through the first exhaust valve 170. Furthermore, the limiting member 130 includes an arc portion 1301, a first bent portion 1302 and a second bent portion 1303, wherein the shape of the arc portion 1301 matches the shape of the expanded liquid storage capsule 400, the first bent portion 1302 has a straight section connected to the lower shell 102, and the end of the second bent portion 1303 has a limiting hook.

[0035] When no liquid medicine is injected into the liquid reservoir 400, it does not apply any force to the arcuate portion 1301, and the limiting member 130 remains in the initial posture; after the liquid medicine is injected into the liquid reservoir 400, as the amount of injected liquid medicine increases, the liquid reservoir 400 expands and elastically deforms, and the deformation is converted into a force on the arcuate portion 1301, pushing the limiting member 130 toward the central axis of the sliding bracket 600 to produce elastic deformation, and the limiting member 130 evolves to the limiting posture; during the synchronous downward movement of the turntable 500 and the sliding bracket 600, when the wedge block 503 moves down to below the limiting hook, the limiting member 130 in the limiting posture can clamp the wedge block 503, and at this time, the injection needle 110 remains in the injection position.

[0036] In an injection device of this embodiment, please refer to Figures 1 to 13 A wedge-shaped tooth 702 is provided between two adjacent second guide grooves 701 , and the shape of the wedge-shaped tooth 702 is adapted to the shape of the wedge block 503 ; When the injection needle 110 remains in the injection position, after pressing the activation button 200 again, the wedge block 503 moves down to the end of the wedge tooth 702, and the pawl 601 pushes the wedge block 503 to slide along the wedge tooth 702 to another second guide groove, thereby realizing the rotation of the turntable 500 relative to the sliding bracket 600, and releasing the clamping limit of the wedge block 503 by the limit member 130.

[0037] In an injection device of this embodiment, please refer to Figures 1 to 15 The turntable 500 includes an inner turntable cylinder 501 and an outer turntable cylinder 502 which are nested with each other. A return spring 120 is provided between the inner turntable cylinder 501 and the outer turntable cylinder 502. The ends of the return spring 120 respectively abut against the lower surface and the top of the turntable.

[0038] Furthermore, the lower housing 102 is provided with a dispensing port 1022 for the tip of the injection needle 110 to pass through. A return spring base 160 is provided on the lower housing 102 corresponding to the dispensing port 1022. The return spring 120 is located between the return spring base 160 and the inner rotary drum 501. Furthermore, the lower housing 102 is provided with a base 800. The guide bracket 700 is disposed above the base 800. The bottom flange of the partition plate 1012 abuts against the edge of the guide bracket 700.

[0039] In an injection device of this embodiment, please refer to Figures 1 to 15The liquid reservoir 400 is connected to the manifold 180. A connecting pipe 190 is provided at the end of the manifold 180. The bottom of the injection needle 110 extends into the interior of the connecting pipe 190 through the inner rotating disk 501. When the injection needle 110 moves down to the side hole on it and connects with the manifold 180, the drug solution can enter the injection needle 110 through the side hole.

[0040] During the expansion of the liquid storage bag 400, the liquid medicine will enter the manifold 180 from the hole at the lower end of the lining head. A second exhaust valve is provided at the end of the manifold 180 to exhaust the gas in the manifold 180. When the liquid medicine transfer is completed, the liquid storage bag 400 stops expanding.

[0041] The working process of the injection device is as follows: 1. Preparation before infusion: As the drug solution flows through the one-way valve 900, it is filtered by the filter membrane 901. The drug solution then enters the reservoir 400, and the gas in the one-way valve 900 and the reservoir 400 is discharged through the first exhaust valve 170. During the expansion of the reservoir 400, the stopper 130 is pushed toward the wedge 503. During the expansion of the reservoir 400, the drug solution enters the manifold 180, and the gas in the manifold 180 is discharged through the second exhaust valve. When the drug solution transfer is complete, the reservoir 400 stops expanding, the tape liner is removed, and the injection device is attached to the appropriate location on the abdomen, completing the pre-infusion preparations.

[0042] 2. Infusion process: To begin the injection, first remove the safety pin 300 on the activation button 200. Press the activation button 200, and the tip of the injection needle 110 penetrates the silicone valve head and enters the subcutaneous tissue. An observation hole is provided on the activation button 200. If blood is seen through this observation hole, it indicates that the needle has penetrated a blood vessel. At this point, the device should be removed and applied to another location on the abdomen. If no blood is seen, it indicates that the needle has penetrated the subcutaneous tissue. The activation button 200 rebounds slightly until the stopper 130 engages the wedge block 503. At this point, the side hole on the injection needle 110 is perfectly positioned within the manifold 180, and the drug solution enters the injection needle 110 through the side hole. When the drug solution is visible through the observation hole, it indicates that the infusion path is unobstructed. At this point, the gas in the injection needle 110 is discharged through the vent hole on the activation button 200 (the vent hole is equipped with a vent membrane), and the infusion officially begins.

[0043] 3. End of infusion: (1) Actively end the infusion: When the activation button 200 is pressed, the wedge-shaped tooth 702 slides into the other second guide groove. At this time, the limit member 130 is located between the two wedge blocks 503, releasing the clamping limit on the wedge blocks 503. Under the elastic force of the return spring 120, the activation button 200 is bounced back and reset, and the injection needle 110 retracts into the interior of the housing 100, and the infusion ends.

[0044] (2) Automatic end of infusion: As the infusion progresses, the liquid in the liquid reservoir 400 gradually decreases, the liquid reservoir 400 gradually retracts, and the limiter 130 gradually returns to its original position. When the liquid injection is completed, the liquid reservoir 400 retracts to its initial state, and the limiter 130 returns to its initial position. At this time, the wedge block 503 is not constrained by the limiter 130, and the activation button 200 automatically pops up under the action of the return spring 120, and the injection needle 110 retracts into the interior of the housing 100, and the infusion is completed.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0047] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0048] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0049] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An injection device, characterized in that The invention comprises a housing, an activation button is provided on its upper surface, an adhesive tape pad is provided on its lower surface, and a needle puncture structure is provided inside the housing, wherein the needle puncture structure comprises: an injection needle movable between a retracted position and an injection position; A limiter having an elastic deformation function, which can evolve between an initial posture and a limit posture; and a delivery assembly, which is connected to the activation button and the injection needle respectively; When the activation button is pressed, the return spring is compressed, and the delivery component cooperates with the limit member in the limit posture, so that the tip of the injection needle extends to the outside of the shell. At this time, the injection needle remains in the injection position; when the activation button is pressed again, the delivery component rotates one position, or the limit member evolves to the initial posture by itself, and the return spring changes from the compressed state to the initial state, so that the tip of the injection needle retracts into the inside of the shell. At this time, the injection needle remains in the retracted position.

2. The injection device according to claim 1, characterized in that The upper surface is provided with a button sliding channel, the button sliding channel is provided with a first guide groove, and the outer surface of the activation button is provided with a first guide block that can slide along the first guide groove.

3. The injection device according to claim 1, characterized in that The delivery assembly includes a turntable and a sliding bracket, wherein the turntable is sleeved inside the sliding bracket, the sliding bracket is connected to the activation button, a pawl is provided on the bottom of the sliding bracket along its circumference, and a wedge block is provided on the bottom of the turntable to abut against the pawl; Pressing the activation button causes the sliding bracket to move downward along its central axis, and the pawl applies pressure to the wedge block, causing the turntable, the sliding bracket and the injection needle to move downward synchronously, and the tip of the injection needle gradually extends to the outside of the shell.

4. The injection device according to claim 3, characterized in that The sliding bracket is provided with an anti-slip hook, the top of the turntable is provided with a through hole, and the anti-slip hook passes through the through hole and extends to the inside of the turntable.

5. The injection device according to claim 3, characterized in that The delivery component also includes a guide bracket mounted on the periphery of the sliding bracket, the guide bracket is provided with a second guide groove and an inner groove, the outer surface of the sliding bracket is provided with a second guide block that can slide along the inner groove, and the wedge block slides along the second guide groove.

6. The injection device according to claim 5, characterized in that A liquid storage bag is provided inside the shell, the liquid storage bag has an elastic deformation function, and the limiting member is located on the side of the liquid storage bag; When no liquid medicine is injected into the liquid storage bag, the limiting member remains in the initial posture; after the liquid medicine is injected into the liquid storage bag, as the amount of injected liquid medicine increases, the liquid storage bag expands and undergoes elastic deformation, and the deformation pushes the limiting member to evolve to the limiting posture. During the process of synchronous downward movement of the turntable and the sliding bracket, the limiting member in the limiting posture can clamp the wedge block, and at this time, the injection needle remains in the injection position.

7. The injection device according to claim 6, characterized in that A wedge-shaped tooth is provided between two adjacent second guide grooves, and the shape of the wedge-shaped tooth is adapted to the shape of the wedge-shaped block; When the injection needle remains in the injection position, after pressing the activation button again, the wedge block moves down to the end of the second guide groove, and the pawl pushes the wedge block to slide along the wedge teeth into the other second guide groove, so that the turntable rotates relative to the sliding bracket, and the clamping limit of the wedge block by the limiting member is released.

8. The injection device according to claim 4, characterized in that The turntable includes an inner turntable cylinder and an outer turntable cylinder which are nested with each other. The return spring is arranged between the inner turntable cylinder and the outer turntable cylinder. The ends of the return spring are respectively against the lower surface and the top of the turntable.

9. The injection device according to claim 8, characterized in that The lower surface is provided with a filling port, the inside of the shell is provided with a one-way valve connected with the filling port, the one-way valve is connected with the liquid storage bag through a liquid inlet pipe, and a filter membrane is provided inside the one-way valve.

10. The injection device according to claim 9, characterized in that The liquid storage bag is connected to the manifold, a connecting pipe is provided at the end of the manifold, and the bottom of the injection needle extends to the inside of the connecting pipe through the inner rotating disk; When the injection needle moves down until the side hole above it is connected to the manifold pipeline, the drug solution can enter the injection needle through the side hole.

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