Gas spring type needleless injector

Abstract

The utility model discloses an air spring type needleless injector, and relates to the technical field of injectors. The device comprises an outer tube shell, a connecting block is arranged on the bottom side of one end of the outer tube shell, a rotating shaft rotationally penetrates through the connecting block, a plurality of annularly-distributed supporting rods are arranged on the outer surface of the rotating shaft, ampoule bottles are detachably installed at the ends of the supporting rods, and first piston rods are movably inserted into the ampoule bottles; a connecting block, a rotating shaft and a supporting rod are arranged on the outer tube shell, so that a rotary mounting frame is formed, a plurality of ampoule bottles can be placed, different ampoule bottles can be rotationally switched for injection, a driving part and a triggering mechanism are arranged on the outer tube shell, and under the mutual cooperation of the driving part and the triggering mechanism, after one-time medicine injection is completed, the driving part is driven to rotate. The second piston rod can be reset through sliding compression of the second piston rod, the time delayed when a reset box needs to be independently arranged due to reset and taking and placing of the second piston rod from the reset box during reset is shortened, and therefore the efficiency of medicine injection is improved.

Description

Technical Field

[0001] The present application relates to the technical field of syringes, and in particular to a gas spring needle-free syringe. Background Art

[0002] Needle-free syringes are different from traditional needle syringes. Needle-free syringes do not rely on needles. Under the action of a high-pressure drive device, the drug liquid is ejected from an extremely small orifice at a high speed. The extremely fine high-speed drug jet formed can instantly penetrate the skin to complete the injection. Since the diameter of the drug jet is much smaller than that of a traditional needle, the pain caused by the injection is very weak, which can reduce the patient's resistance to injection. In addition, since needle-free injection does not use a needle, it can avoid potential needlestick injuries and avoid skin nodules caused by long-term repeated injections in the same area. It is suitable for long-term injections and large-scale injection scenarios.

[0003] Some existing gas spring needle-free syringes are separately equipped with a reset box. After the injection of a drug is completed, the ampoule is first removed and then the syringe is placed in the reset box. The piston rod of the gas cylinder is reset by the reset mechanism of the reset box. This method has certain shortcomings. In practice, due to the need to inject multiple drugs for a certain condition and they need to be injected separately, after each injection of a drug, the ampoule needs to be removed from the syringe, and then the syringe is placed in the reset box and reset by the reset mechanism. After the reset is completed, another ampoule is installed. When injecting multiple bottles of drugs, the syringe needs to be placed in the reset box and then taken out back and forth. The process is cumbersome and time-consuming, which reduces the injection efficiency. Therefore, the present application proposes a gas spring needle-free syringe. Summary of the Invention

[0004] The purpose of this application is to solve the problem that the existing syringe is equipped with a reset box separately, and the piston rod in the syringe cylinder is reset by the reset mechanism of the reset box. When injecting multiple drugs, it is necessary to take and put them back and forth, resulting in low injection efficiency. This application provides a gas spring needle-free syringe.

[0005] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0006] Gas spring needle-free syringe, including:

[0007] The outer tube shell has a connecting block provided on the bottom side of one end, a rotating shaft rotatably passing through the connecting block, and a plurality of annularly distributed support rods provided on the outer surface of the rotating shaft. An ampoule bottle is detachably mounted on the end of the support rod, and a first piston rod is movably inserted into the ampoule bottle. Two through grooves are symmetrically provided on the outer surface of the outer tube shell, and a positioning member for positioning and fixing the rotating shaft is provided on the connecting block;

[0008] An air cylinder is provided at the other end of the outer tube shell, a second piston rod is slidably inserted into the air cylinder, and a driving member is provided on the outer tube shell for driving the second piston rod to slide and retract into the air cylinder and compress the gas;

[0009] The trigger mechanism is arranged on the outer tube shell. When the second piston rod compresses the gas, the trigger mechanism is used to fix or release the second piston rod.

[0010] Furthermore, a sleeve is constructed at the end of the support rod, an insertion port is opened through one side of the sleeve, a card slot is opened on the inner wall of the sleeve, a card block that cooperates with the card slot is fixed on the outer surface of the ampoule bottle, and rubber protrusions are provided on the inner walls on both sides of the insertion port.

[0011] Furthermore, the positioning member includes a positioning rod slidably inserted on the connecting block, a limit plate is fixed on the positioning rod, a positioning spring sleeved on the positioning rod is installed between the limit plate and the connecting block, and a plurality of positioning holes distributed in a ring are opened on the outer surface of the rotating shaft, and the positioning rod is plugged into the positioning hole.

[0012] Furthermore, the driving member includes a first through-slot that passes through the outer tube shell, and mounting plates are provided on the outer surface of the outer tube shell and on both sides of the first through-slot. A horizontal plate is provided for horizontal sliding between the two mounting plates, and a sleeve is provided at one end of the horizontal plate. A contact plate is movably inserted into the sleeve, the end of which passes through the first through-slot and overlaps with the end of the second piston rod. Pressure plates are hinged on the two mounting plates, and a movable plate is hinged to the middle section of the pressure plate and the other end of the horizontal plate.

[0013] Furthermore, the cross sections of the sleeve and the contact plate are both rectangular, an arc-shaped groove is provided on the inner wall of the sleeve, and an arc-shaped steel sheet that is plugged into the arc-shaped groove is provided on the contact plate.

[0014] Furthermore, the trigger mechanism includes a second through-groove extending through the outer tube shell, and convex plates are provided on the outer surface of the outer tube shell and on both sides of the second through-groove. A shift plate is hinged between the two convex plates, and the shift plate is constructed with an inclined surface and a buckle groove, and a resistance spring is connected between the inclined surface and the outer tube shell.

[0015] Furthermore, a baffle is slidably provided on the outer tube shell, and the baffle can overlap with the inclined surface of the shifting plate after sliding.

[0016] Furthermore, a positioning ring is provided on the inner wall of the outer tube shell, one end of the gas cylinder is in contact with and overlapped with the positioning ring, and the other end of the outer tube shell is threadedly inserted with an end cap in contact with and overlapped with the gas cylinder.

[0017] The beneficial effects of this application are as follows:

[0018] In the present application, a connecting block, a rotating shaft and a support rod are provided on the outer tube shell to form a rotating mounting frame, which can hold several ampoules and can be rotated to switch between different ampoules for injection. A driving member and a trigger mechanism are provided on the outer tube shell. When the two cooperate with each other, after a drug injection is completed, the sliding compression of the second piston rod can be reset by itself, reducing the need for a separate reset box for reset and the time wasted in taking out and placing the drug from the reset box during reset, thereby improving the efficiency of drug injection.

[0019] In the present application, by setting an inlet on the sleeve and pressing to cooperate with the elastic deformation of the rubber protrusion, the ampoule bottle can be quickly connected, and the ampoule bottle can be limited by the clamping cooperation of the slot and the block to prevent its axial movement and ensure stability during injection.

[0020] In the present application, a horizontal plate is set by horizontal sliding, the sliding contact plate contacts the end face of the second piston rod, and then the pressure plate is pressed to make the pressure plate rotate around the hinge point, so that the movable plate contacts the horizontal plate, thereby driving the horizontal plate to move, thereby driving the second piston rod to slide and retract into the air cylinder, thereby completing the pressurization. The pressurization method is relatively simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural diagram of this application;

[0022] Figure 2 It is a sectional view of the three-dimensional structure of this application;

[0023] Figure 3 It is an exploded view of the three-dimensional structure of part of this application;

[0024] Figure 4 This is another schematic diagram of the three-dimensional structure of the present application;

[0025] Figure 5 This is a three-dimensional structural diagram of the driving component of this application;

[0026] Figure 6 This is a sectional view of the three-dimensional structure of the driving component of the present application;

[0027] Figure 7 This application Figure 2 Enlarged view of point A in the middle;

[0028] Figure 8 This application Figure 2 Enlarged view of point B in the middle;

[0029] Reference numerals: 1, outer tube shell; 2, connecting block; 3, rotating shaft; 4, supporting rod; 5, ampoule; 6, first piston rod; 7, through groove; 8, positioning member; 9, air cylinder; 10, second piston rod; 11, driving member; 12, trigger mechanism; 13, sleeve; 14, insertion port; 15, clamping groove; 16, clamping block; 17, rubber bump; 18, arc groove; 19, arc-shaped steel sheet; 20, baffle; 21, positioning ring; 22, end cap ;801, positioning rod; 802, limit plate; 803, positioning spring; 804, positioning hole; 1101, first through slot; 1102, mounting plate; 1103, horizontal plate; 1104, sleeve; 1105, resistance plate; 1106, pressure plate; 1107, movable plate; 1201, second through slot; 1202, convex plate; 1203, dial plate; 1204, inclined surface; 1205, buckle slot; 1206, resistance spring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0031] like Figures 1-8 As shown, a gas spring needle-free syringe proposed in one embodiment of the present application includes:

[0032] The outer tube shell 1 is provided with a connecting block 2 on the bottom side of one end. A rotating shaft 3 is rotated through the connecting block 2. The outer surface of the rotating shaft 3 is provided with a number of support rods 4 distributed in an annular shape. The end of the support rod 4 is detachably mounted with an ampoule 5. A first piston rod 6 is movably inserted into the ampoule 5. A small injection hole is opened through the end of the ampoule 5 away from the first piston rod 6. The ampoule 5 is used to contain liquid medicine. By applying pressure to the first piston rod 6, the first piston rod 6 sprays the liquid medicine from the injection hole. Two through grooves 7 are symmetrically provided on the outer surface of the outer tube shell 1. A positioning member 8 for positioning and fixing the rotating shaft 3 is provided on the connecting block 2. Preferably, when the rotating shaft 3 is rotated, the ampoule 5 can be located in the outer tube shell 1 through the through groove 7. Preferably, when the ampoule 5 is located in the outer tube shell 1, the ampoule 5 can maintain a coaxial state with the outer tube shell 1. In actual use, multiple ampoules 5 can be respectively installed at the ends of several support rods 4. During the injection process, the rotating shaft 3 can be rotated, and several ampoules 5 can be placed in the outer tube shell 1 in turn, thereby completing the drug switching. Through the provided positioning member 8, when the ampoule 5 is located in the outer tube shell 1 and maintains a coaxial state with the outer tube shell 1, it fixes the rotating shaft 3, thereby positioning and fixing the ampoule 5 to ensure effective injection;

[0033] The gas cylinder 9 is provided at the other end of the outer tube shell 1. A second piston rod 10 is slidably inserted into the gas cylinder 9. A driving member 11 is provided on the outer tube shell 1, which is used to drive the second piston rod 10 to slide and retract into the gas cylinder 9 and compress the gas. Preferably, a gas filling valve port is provided at the end of the gas cylinder 9 away from the second piston rod 10. Gas is added to the gas cylinder 9 through the gas filling valve port, and the second piston rod 10 is driven by the driving member 11 to slide and retract into the gas cylinder 9, and the second piston rod 10 compresses the gas in the gas cylinder 9. The air pressure generated by the compressed gas can be used as a power member to drive the second piston rod 10 to reset, so that the second piston rod 10 can hit the first piston rod 6, thereby completing the injection of the liquid medicine.

[0034] The trigger mechanism 12 is provided on the outer tube shell 1. When the second piston rod 10 compresses the gas, the trigger mechanism 12 is used to fix or release the second piston rod 10. When the second piston rod 10 compresses the gas, the trigger mechanism 12 fixes the second piston rod 10, keeping the compressed air in the gas cylinder 9 in a compressed state to facilitate the rotation and switching of the ampoule 5. After the ampoule 5 is switched, the trigger mechanism 12 releases the fixation of the second piston rod 10, so that the second piston rod 10 impacts the first piston rod 6 to complete the injection of the drug;

[0035] In this solution, a rotating shaft 3 is rotatably provided at one end of the outer tube shell 1, and the ends of several support rods 4 distributed in a ring can be placed on ampules 5. When injecting medicine, it is only necessary to rotate the rotating shaft 3 to switch different ampoules 5 and inject different medicines. At the same time, a driving member 11 and a trigger mechanism 12 that cooperate with each other are provided on the outer tube shell 1. After completing a drug injection, there is no need to place the outer tube shell 1 in the reset box. The outer tube shell 1 itself can realize the sliding compression of the second piston rod 10 for reset through the driving member 11, thereby reducing the time wasted for taking out and placing from the reset box due to the need for reset, thereby improving the efficiency of drug injection.

[0036] like Figure 3 As shown, in some embodiments, the end of the support rod 4 is constructed with a sleeve 13, and a placement port 14 is opened through one side of the sleeve 13. A card slot 15 is opened on the inner wall of the sleeve 13. A card block 16 that fits in the card slot 15 is fixed on the outer surface of the ampoule 5. Rubber bumps 17 are provided on both sides of the inner wall of the placement port 14. When the ampoule 5 is placed, the ampoule 5 is pressed from the placement port 14 into the sleeve 13, and the card block 16 is locked in the card slot 15. The ampoule 5 and the sleeve 13 are coaxially aligned. The deformable material of the rubber protrusion 17 makes it difficult for the ampoule 5 to fall out of the sleeve 13. At the same time, the clamping block 16 and the clamping groove 15 are used to limit the axial movement of the ampoule 5, thereby ensuring the stability during the injection of the drug. The opening 14, the clamping groove 15 and the rubber protrusion 17 make it easy to remove the ampoule 5, thereby improving the injection efficiency.

[0037] like Figure 8 As shown, in some embodiments, the positioning member 8 includes a positioning rod 801 that is slidably inserted on the connecting block 2, and a limiting plate 802 is fixed on the positioning rod 801. A positioning spring 803 that is sleeved on the positioning rod 801 is installed between the limiting plate 802 and the connecting block 2. A plurality of positioning holes 804 distributed in an annular shape are opened on the outer surface of the rotating shaft 3. The positioning rod 801 is plugged into the positioning hole 804. Under the elastic force of the positioning spring 803, the end of the positioning rod 801 contacts the outer surface of the rotating shaft 3. When the rotating shaft 3 is rotated, when the positioning rod 801 is aligned with the positioning hole 804, under the elastic force of the positioning spring 803, the positioning rod 801 is movably inserted into the corresponding 804, thereby completing the positioning and locking of the rotating shaft 3. Preferably, the number of the support rods 4 is three, and the number of the positioning holes 804 is six, wherein the three positioning holes 804 correspond to the three support rods 4 respectively. When installing the ampoule bottle 5, the rotating shaft 3 can be rotated so that the three support rods 4 are respectively misaligned with the outer tube shell 1. When the three ampoules 5 are installed, the rotating shaft 3 is rotated again so that one of the ampoule bottles 5 is located in the outer tube shell 1. The orifice of the positioning hole 804 is constructed with an arc-shaped expansion, and the end of the positioning rod 801 is an arc-shaped head structure. By utilizing the arc-shaped cooperation, the rotating shaft 3 can be rotated to realize automatic locking or unlocking, making the switching process more convenient and quick.

[0038] like Figure 4 As shown, in some embodiments, the driving member 11 includes a first through-groove 1101 that is opened on the outer tube shell 1, and the outer surface of the outer tube shell 1 and on both sides of the first through-groove 1101 are provided with mounting plates 1102, and a horizontal plate 1103 is provided between the two mounting plates 1102 for horizontal sliding. The opposite sides of the two mounting plates 1102 are provided with a sliding groove, and the horizontal plate 1103 is slidably inserted into the two sliding grooves. A sleeve 1104 is provided at one end of the horizontal plate 1103, and the sleeve 1104 The inner movable insert is provided with a contact plate 1105 whose end passes through the first through slot 1101 and overlaps with the end of the second piston rod 10. A pressure plate 1106 is hinged on the two mounting plates 1102. The middle section of the pressure plate 1106 and the other end of the cross plate 1103 are hinged with a movable plate 1107. When the second piston rod 10 is pressurized, the pressure plate 1106 is first moved to drive the cross plate 1103 to slide and make the position of the sleeve 1104 correspond to the end of the second piston rod 10. At this time, Figure 4As shown, slide the contact plate 1105 so that the contact plate 1105 contacts the end of the second piston rod 10, hold the outer tube shell 1, and then press the pressure plate 1106 to rotate it around the hinge point, so that the movable plate 1107 contacts the horizontal plate 1103, thereby driving the horizontal plate 1103 to move. When the horizontal plate 1103 moves, the contact plate 1105 contacts the second piston rod 10, thereby driving the second piston rod 10 to slide and retract into the air cylinder 9, thereby completing the pressurization. The pressurization method is relatively simple and convenient, and only requires pressing the pressure plate 1106 and sliding the contact plate 1105.

[0039] like Figure 5 and Figure 6 As shown, in some embodiments, the cross-sections of the sleeve 1104 and the contact plate 1105 are both constructed as rectangles, the inner wall of the sleeve 1104 is provided with an arc-shaped groove 18, and the contact plate 1105 is provided with an arc-shaped steel sheet 19 that is plugged into the arc-shaped groove 18. Since the sleeve 1104 and the contact plate 1105 are slidably matched, in order to ensure that the contact plate 1105 can effectively contact the second piston rod 10 when the cross plate 1103 slides, an arc-shaped groove 18 is provided on the inner wall of the sleeve 1104, and an arc-shaped steel sheet 19 is provided on the contact plate 1105. By utilizing the deformable property of the material of the arc-shaped steel sheet 19, after the contact plate 1105 slides, the contact plate 1105 can be temporarily fixed by the snap-fitting of the arc-shaped steel sheet 19 and the arc-shaped groove 18.

[0040] like Figure 4 and Figure 7 As shown, in some embodiments, the trigger mechanism 12 includes a second through-slot 1201 extending through the outer tube shell 1. A protruding plate 1202 is provided on the outer surface of the outer tube shell 1 and on both sides of the second through-slot 1201. A dial plate 1203 is hingedly connected between the two protruding plates 1202. The dial plate 1203 is configured with an inclined surface 1204 and a buckle groove 1205. A resisting spring 1206 is connected between the inclined surface 1204 and the outer tube shell 1. Figure 7As shown, the inclined surface 1204 is located on the left side and the buckle groove 1205 is located on the right side. When the second piston rod 10 slides to compress the gas in the gas cylinder 9, the end of the second piston rod 10 will contact the inclined surface 1204. Under the action of the resistance force, the dial plate 1203 rotates around the hinge point and squeezes the resistance spring 1206. At this time, the second piston rod 10 can pass smoothly. When the second piston rod 10 is compressed and the end passes over the inclined surface 1204, the dial plate 1203 rotates and resets around the hinge point under the elastic resistance of the resistance spring 1206, thereby making the end of the second piston rod 10 It is clamped in the buckle groove 1205, thereby completing the fixation of the second piston rod 10, so that when the second piston rod 10 is driven by the driving member 11 to compress the gas, the trigger mechanism 12 can fix the second piston rod 10 in a connected manner. When the fixation needs to be released, the dial plate 1203 is pressed, and the second piston rod 10 is pushed to move under the pressure of the compressed gas. It should be noted that when the fixation needs to be released by injecting the drug, the contact plate 1105 needs to be slid first so that it does not contact the second piston rod 10, so that it does not hinder the movement of the second piston rod 10.

[0041] like Figure 1 and Figure 4 As shown, in some embodiments, a baffle 20 is slidably provided on the outer tube shell 1, a slide groove is opened on the outer tube shell 1, and a slider slidably inserted in the slide groove is constructed on the baffle 20. After sliding, the baffle 20 can overlap with the inclined surface 1204 of the dial plate 1203. When completing an injection of medicine, the second piston rod 10 is compressed and fixed by the driving member 11 and the trigger mechanism 12, and then rotated to switch different ampoules 5. When switching the ampoule bottle 5, the baffle 20 can be slid so that it overlaps with the inclined surface 1204, thereby limiting the dial plate 1203 to avoid accidentally touching the dial plate 1203 when switching the ampoule bottle 5.

[0042] like Figure 2 As shown, in some embodiments, a positioning ring 21 is provided on the inner wall of the outer tube shell 1, and one end of the air cylinder 9 is in contact with the positioning ring 21 and overlapped, and the other end of the outer tube shell 1 is threadedly inserted with an end cap 22 that is in contact with the air cylinder 9 and overlapped. By providing the positioning ring 21 and the end cap 22, the air cylinder 9 does not need to be directly fixed to the outer tube shell 1. The air cylinder 9 can be movably inserted into the outer tube shell 1, and through the obstruction of the positioning ring 21 and the contact fixation of the end cap 22, the air cylinder 9 and the second piston rod 10 are directly detachably connected to the outer tube shell 1, which is convenient for removing it for inflation and replenishing air.

[0043] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Gas spring needle-free syringe, characterized in that: include: An outer tube shell (1) is provided with a connecting block (2) on the bottom side of one end thereof, a rotating shaft (3) is rotatably passed through the connecting block (2), a plurality of support rods (4) distributed in an annular shape are provided on the outer surface of the rotating shaft (3), an ampoule (5) is detachably mounted on the end of the support rod (4), a first piston rod (6) is movably inserted into the ampoule (5), two through grooves (7) are symmetrically provided on the outer surface of the outer tube shell (1), and a positioning member (8) for positioning and fixing the rotating shaft (3) is provided on the connecting block (2); An air cylinder (9) is provided at the other end of the outer tube shell (1), a second piston rod (10) is slidably inserted into the air cylinder (9), and a driving member (11) is provided on the outer tube shell (1) for driving the second piston rod (10) to slide and retract into the air cylinder (9) and compress the gas; A trigger mechanism (12) is provided on the outer tube shell (1). When the second piston rod (10) compresses the gas, the trigger mechanism (12) is used to fix or release the second piston rod (10).

2. The gas spring needle-free syringe according to claim 1, characterized in that: The end of the support rod (4) is provided with a sleeve (13), one side of the sleeve (13) is provided with an insertion port (14), the inner wall of the sleeve (13) is provided with a clamping groove (15), the outer surface of the ampoule bottle (5) is fixed with a clamping block (16) that is engaged with the clamping groove (15), and the inner walls on both sides of the insertion port (14) are provided with rubber protrusions (17).

3. The gas spring needle-free syringe according to claim 1, characterized in that: The positioning member (8) comprises a positioning rod (801) slidably inserted on the connecting block (2), a limiting plate (802) is fixedly provided on the positioning rod (801), a positioning spring (803) sleeved on the positioning rod (801) is installed between the limiting plate (802) and the connecting block (2), and a plurality of positioning holes (804) distributed in an annular shape are formed on the outer surface of the rotating shaft (3), and the positioning rod (801) is plugged into and matched with the positioning holes (804).

4. The gas spring needle-free syringe according to claim 1, characterized in that: The driving member (11) includes a first through-groove (1101) extending through the outer tube shell (1), mounting plates (1102) are provided on the outer surface of the outer tube shell (1) and on both sides of the first through-groove (1101), a horizontal plate (1103) is provided between the two mounting plates (1102) for horizontal sliding, a sleeve (1104) is provided at one end of the horizontal plate (1103), a contact plate (1105) is movably inserted into the sleeve (1104), the end of which extends through the first through-groove (1101) and overlaps with the end of the second piston rod (10), a pressure plate (1106) is hingedly connected to the two mounting plates (1102), and a movable plate (1107) is hingedly connected between the middle section of the pressure plate (1106) and the other end of the horizontal plate (1103).

5. The gas spring needle-free injector according to claim 4, characterized in that: The cross-sections of the sleeve (1104) and the contact plate (1105) are both rectangular. An arc-shaped groove (18) is provided on the inner wall of the sleeve (1104). An arc-shaped steel sheet (19) is provided on the contact plate (1105) and is plugged into the arc-shaped groove (18).

6. The gas spring needle-free syringe according to claim 1, characterized in that: The trigger mechanism (12) comprises a second through-groove (1201) extending through the outer tube shell (1); convex plates (1202) are provided on the outer surface of the outer tube shell (1) and on both sides of the second through-groove (1201); a shift plate (1203) is hingedly connected between the two convex plates (1202); an inclined surface (1204) and a buckling groove (1205) are constructed on the shift plate (1203); and a resisting spring (1206) is connected between the inclined surface (1204) and the outer tube shell (1).

7. The gas spring needle-free injector according to claim 6, characterized in that: A baffle (20) is slidably provided on the outer tube shell (1), and after sliding, the baffle (20) can overlap the inclined surface (1204) of the shifting plate (1203).

8. The gas spring needle-free injector according to claim 1, characterized in that: The inner wall of the outer tube shell (1) is provided with a positioning ring (21), one end of the gas cylinder (9) is in contact with the positioning ring (21), and the other end of the outer tube shell (1) is threadedly inserted with an end cap (22) in contact with the gas cylinder (9).

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