Needleless injector body and needleless injector
By introducing a locking mechanism into the needle-free injector, the problem of accidental button pressing is solved, ensuring that the injection operation is performed in the correct sequence, thus achieving operational reliability and safety.
Patent Information
- Application Number
- CN202520034670.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2026-05-15
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing needle-free injectors pose a risk that the button may be accidentally pressed, causing the operation to be interrupted or fail, especially during drug aspiration and injection.
A locking mechanism is designed, including a pressing member and a blocking member. The pressing action of the pressing member unlocks the injection actuator, allowing it to switch between a non-actuated position and an actuated position, ensuring that the injection operation is performed in the correct steps.
It effectively prevents malfunctions of the injection actuator, ensures that the drug aspiration and injection process is executed in the correct sequence, and avoids interruption and failure of the operation process.
Smart Images
Figure CN224235861U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a medical device for injecting a substance. More specifically, this utility model relates to a needle-free injector body and a needle-free injector. Background Technology
[0002] Needle-free injectors eliminate the need for needles. Instead, they are medical devices that inject medication into the patient's body by applying high pressure through a micro-orifice at the tip, thus avoiding the pain of needle pricks. A needle-free injector includes an injection head and a body. The injection head and a reservoir, such as a cartridge, are housed within the body, where the injection head draws medication from the reservoir. Only after medication draw is complete does the actuator actuate the injection head to deliver the injection; injection is the final step in the entire procedure. Existing actuators are buttons; pressing the button triggers the injection, but the button cannot be pressed at other times. Therefore, there is a risk that the button might be pressed accidentally during the procedure, such as by the operator accidentally touching it or by the button hitting another object. This could interfere with other steps in the procedure or cause failure, such as interrupting the medication draw or prematurely injecting the medication before draw is complete.
[0003] Therefore, there is a need to provide a needle-free injector body and a needle-free injector to at least partially solve the above problems. Utility Model Content
[0004] According to one aspect of the present invention, a needle-free injector body is provided, comprising: a base having a base hole at its rear end; and an injection actuator inserted into the base through the base hole and configured to move between an actuated position and a non-actuated position, wherein in the actuated position, the injection actuator actuates the needle-free injector body to perform injection, wherein the needle-free injector body further comprises a locking mechanism for the injection actuator, the locking mechanism being configured to lock the injection actuator in the non-actuated position in a locked state and allow the injection actuator to move from the non-actuated position in an unlocked state. When the actuation position is reached, the locking mechanism includes: a pressing member disposed on the side of the base; and a blocking member disposed below one end of the pressing member and including at least one vertical arm, each vertical arm including a groove. The injection actuator includes at least one stop protrusion. In the locked state, the groove is offset from the corresponding stop protrusion. When unlocking, the pressing member is pressed, and the pressing member drives the blocking member to move downward, so that the groove aligns with the corresponding stop protrusion and allows the corresponding stop protrusion to pass through, thereby allowing the injection actuator to move from the non-actuated position to the actuated position.
[0005] In one embodiment, the blocking member includes two vertical arms and a transverse arm extending between the two vertical arms.
[0006] In one embodiment, the injection actuator includes two stop protrusions that, when the blocking member moves downward, simultaneously align with and pass through their corresponding grooves.
[0007] In one embodiment, the base is provided with at least one sliding channel, the number of which corresponds to the number of vertical arms, and the vertical arms move up and down in the corresponding sliding channels.
[0008] In one embodiment, the base is provided with two sliding channels, which are located on both sides of the hole in the base.
[0009] In one embodiment, when the vertical arm moves to the bottom of the corresponding sliding channel, the groove aligns with the corresponding stop protrusion.
[0010] In one embodiment, the locking mechanism further includes at least one blocking member return spring, and at least one blocking member return spring receiving hole is provided in the base, wherein the blocking member return spring is disposed between the transverse arm and the corresponding blocking member return spring receiving hole.
[0011] In one embodiment, the locking mechanism includes two blocking member return springs, and the base is provided with two blocking member return spring receiving holes.
[0012] In one embodiment, the locking mechanism further includes at least one pressing member return spring, and at least one pressing member return spring receiving post is also provided on the side of the base, the pressing member return spring being disposed between the pressing member and the corresponding pressing member return spring receiving post.
[0013] In one embodiment, the locking mechanism includes two pressing member return springs, and two pressing member return spring receiving posts are provided on the side of the base.
[0014] In one embodiment, two pressing member reset spring receiving holes are provided in the lower surface of the pressing member, and one end of the pressing member reset spring is disposed in the corresponding pressing member reset spring receiving hole.
[0015] In one embodiment, the pressing member includes a pressing member body and two pressing member extensions extending from the pressing member body on both sides.
[0016] In one embodiment, the needleless injector body further includes an upper cover disposed above the pressing member, the upper cover being fitted to the side of the base, and the upper cover having a pressing member receiving hole to receive the pressing member body and expose the pressing member body.
[0017] In one embodiment, the two pressing member extensions are disposed below the edge of the pressing member receiving hole.
[0018] According to another aspect of the present invention, a needleless injector is provided, comprising a needleless injector body as described above and an injection head mounted on the front end of the needleless injector body.
[0019] This invention provides a locking mechanism for an injection actuator. The locking mechanism is simple in structure, low in cost, and easy to implement. It can effectively prevent the injection actuator from malfunctioning and ensure that the entire drug aspiration and injection process is executed in the correct sequence. Attached Figure Description
[0020] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.
[0021] Figure 1 This is a perspective view of a needle-free injector according to one embodiment of the present invention.
[0022] Figure 2 This is a cross-sectional view of a needleless injector according to one embodiment of the present invention, taken along the longitudinal symmetry plane of the pressing member.
[0023] Figure 3 This is an exploded view of the top cover, pressing member, and base according to one embodiment of the present invention.
[0024] Figure 4 This is a partial enlarged view of the pressing member of a needleless injector according to one embodiment of the present invention, wherein the base and top cover have been removed to show details of the locking mechanism.
[0025] Figure 5 This is a perspective view of a base according to one embodiment of the present invention.
[0026] Figure 6 This is a cross-sectional view of the base according to one embodiment of the present invention, taken along the transverse center plane of the sliding channel, showing details of the sliding channel, the stop member return spring receiving hole, and the base hole.
[0027] Figure 7 This is a perspective view of a blocking member according to one embodiment of the present invention.
[0028] Figure 8 This is a perspective view of an injection actuator for a needleless injector according to one embodiment of the present invention.
[0029] Figure 9 This is another perspective view of the injection actuator of a needleless injector according to one embodiment of the present invention.
[0030] Figure 10 This is a cross-sectional view taken along the transverse center plane of the sliding channel in the assembled state of a needleless injector according to one embodiment of the present invention, showing the locked state of the locking mechanism. Detailed Implementation
[0031] Now, with reference to the accompanying drawings, specific embodiments of the present invention will be described in detail. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on these preferred embodiments, and such other ways also fall within the scope of the present invention.
[0032] First, it should be noted that the "axial direction" or "longitudinal direction" mentioned in this article can be understood as the direction of the axis of the needle-free injector. In this axial direction, the direction towards the patient's medication site when using the needle-free injector is called the "front side," and the opposite direction is called the "rear side." The direction in which the pressing component faces is called the upward direction or vertical direction, and the direction perpendicular to the vertical and longitudinal directions is called the transverse direction.
[0033] It should be noted that this article uses injectable pharmaceuticals, liquids, and other pharmaceutical substances as examples to describe the concept of this disclosure, but this is merely an example and is not restrictive. The injectable substance can be of various other types, such as saline solution, glucose, etc. As long as it can be injected into the human body by the needle-free injector of this disclosure, it falls within the protection scope of this disclosure.
[0034] refer to Figure 1 and Figure 2The needle-free injector 100 includes a needle-free injector body 20 and an injection head 10 mounted at the front end of the needle-free injector body 20. The injection head 10 includes a drug tube 11 and a piston rod 12 capable of pushing liquid medication forward within the drug tube 11. A cap is provided on the injection head 10 to close an injection micro-orifice located at the front end of the drug tube, connecting the chamber of the drug tube to the outside. The needle-free injector body 20 includes a base 21, an outer housing 22, and an internal push rod assembly 23. The base 21 has a forward opening, and the outer housing 22 has a rearward opening and is mounted at the front end of the base 21 to form a receiving space between the base 21 and the outer housing 22. The outer housing 22 has a front opening for securely mounting the injection head and its drug tube. The internal push rod assembly 23 is located within the receiving space and has a forward opening. A medication reservoir can be accommodated within the internal push rod assembly 23 and moves with the internal push rod assembly 23.
[0035] Throughout the drug aspiration and injection process, the outer shell 22 is fixed relative to the drug tube 11, and the internal push rod assembly 23 is fixed relative to the drug reservoir and piston rod 12. However, the outer shell 22, the internal push rod assembly 23, and the base 21 can all move relative to each other. Therefore, the outer shell 22 can drive the drug tube 11 to move, and the internal push rod assembly 23 can drive the drug reservoir and piston rod 12 to move.
[0036] The following is a brief description of the drug aspiration and injection process, which includes the following main steps in sequence: installation, pressurization and energy storage, drug aspiration, and injection. First, in the installation step, the piston rod 12 of the injection head 10 is inserted into the drug reservoir. Then, the injection head and drug reservoir are installed as a whole into the needle-free injector body. When the drug reservoir enters the internal push rod assembly 23 and moves backward until it can no longer move, the piston rod 12 and the internal push rod assembly 23 are precisely engaged and fixed together, and the drug tube 11 and the outer shell 22 are also precisely threaded together.
[0037] The next step is to compress and store energy in the actuation spring. Specifically, the outer housing 22 is rotated to move it backward relative to the base 21 (achieved through a threaded engagement between the two), causing the outer housing 22 to move the internal push rod assembly 23 backward. When the outer housing 22 is threadedly tightened relative to the base 21, the internal push rod assembly 23 is locked by a locking mechanism. During this process, the actuation spring is compressed and stores energy in preparation for the final injection step.
[0038] Next is the drug aspiration step. Specifically, the outer housing 22 is rotated to move forward relative to the base 21 (achieved through a threaded engagement between the two), while the internal push rod assembly 23 remains fixed relative to the base 21 due to being locked by the locking mechanism. In other words, during this process, the outer housing 22 moves forward relative to the internal push rod assembly 23. Since the drug tube 11 is fixed relative to the outer housing 22, and the drug reservoir and piston rod 12 are fixed relative to the internal push rod assembly 23, the drug tube 11 moves forward relative to the drug reservoir and piston rod 12. Furthermore, since the injection micro-orifice of the drug tube 11 is sealed by a cap, a drug-containing cavity appears inside the drug tube 11 when it moves forward relative to the piston rod 12. The pressure inside the drug-containing cavity is relatively low, thus allowing the liquid from the drug reservoir to be drawn into the drug-containing cavity through the drug channel in the piston rod 12, thereby completing the drug aspiration.
[0039] Finally, the injection step. In this step, the outer housing 22 and the drug tube 11 are fixed relative to the base 21, while the internal push rod assembly 23, the drug reservoir, and the piston rod 12 move forward relative to the base 21. Specifically, when injection is required, the injection actuator 30 at the rear end of the base 21 is pressed. The actuator 30 moves forward, releasing the locking mechanism from locking the internal push rod assembly 23. After being unlocked, the internal push rod assembly 23 can move forward relative to the base 21. At this time, the pressurized and energy-storing actuator spring applies a large thrust to the internal push rod assembly 23, causing it to drive the piston rod 12 forward and squeeze the drug in the drug reservoir, allowing the drug to be ejected through the injection micro-orifice.
[0040] The figure shows the injection actuator 30 in the form of a button, but this is only an example; the injection actuator 30 can have various other structural forms. The injection actuator 30 can be connected to the internal push rod assembly 23 via an elastic member 31, which can be a spring, such as a compression spring, to allow the injection actuator 30 to be pressed to actuate the injection operation and then return to its original position. As can be seen from the above steps, the injection actuator 30 can only be actuated (i.e., pressed) in the final injection operation step and returns to its original position via the elastic member 31 after being pressed. At other times, the injection actuator 30 must remain in its original position (i.e., the unacted position) to prevent interference with other operations or to avoid operational failure.
[0041] Therefore, this invention proposes a locking mechanism for the injection actuator 30, which enables the injection actuator 30 to be actuated during the injection step and remain in an inactive position at other times, so as to prevent the injection actuator 30 from being accidentally triggered.
[0042] The locking mechanism is described below with reference to the accompanying drawings. (Reference) Figures 1 to 4The locking mechanism is located on the base 21 and includes a pressing member 40 and a blocking member 50. The base 21 is generally cylindrical, with one side being a longitudinal plane parallel to the axial direction. The pressing member 40 is disposed on this plane, and a top cover 211 is disposed on the base 21 on this plane. The top cover 211 is fixed to the base 21 by, for example, a snap-fit engagement. The pressing member 40 is disposed between the top cover 211 and the base 21. The pressing member 40 includes a pressing member body 401 and two pressing member extensions 402 extending from the pressing member body 401 on both sides. Two pressing member return spring receiving holes 403, spaced apart along the axial direction, are provided on the bottom surface of the pressing member body 401. These two pressing member return spring receiving holes 403 are blind holes used to receive pressing member return springs 41, which can be, for example, compression springs. The upper cover 211 is provided with a pressing member receiving hole 212, the shape and size of which correspond to the pressing member body 401. When the upper cover 211 is assembled to the base 21, the pressing member body 401 is received in the pressing member receiving hole 212 and exposed therefrom, while the pressing member extension 402 cannot pass through the pressing member receiving hole 212. Instead, it is blocked below the pressing member receiving hole 212 and hidden. In this way, the pressing member 40 is limited in the upward direction by means of the pressing member extension 402.
[0043] See Figure 3 and Figure 5 Two press member reset spring receiving posts 42 are provided in the longitudinal plane of the base 21 at positions corresponding to the two press member reset spring receiving holes 403 of the press member 40. Each press member reset spring receiving post 42 is hollow inside and has a spring receiving cavity for accommodating the press member reset spring 41. In this way, each press member reset spring 42 is received in one press member reset spring receiving hole 403 of the press member 40 and the press member reset spring receiving post 42 of the base 21, as well as between the two. When the press member 40 is pressed down, the press member 40 moves downward and compresses the press member reset spring 41. When the press member 40 is no longer pressed down, the press member 40 is pushed upward by the press member reset spring 41 and resets until the press member extension 402 abuts against the lower surface of the upper cover 211.
[0044] It should be noted that the number and position of the pressing component return springs 41 are merely examples and are not limiting; more or fewer pressing component return springs can be provided. For example, the pressing component return spring can be a single spring located at the center of the pressing component body 401, and correspondingly, there is only one pressing component return spring receiving hole 403 and one pressing component return spring receiving post 42; the pressing component return spring can also be provided in three, four or more forms, and the pressing component return spring receiving hole 403 and the pressing component return spring receiving post 42 can also be provided in three, four or more forms accordingly. These springs can be uniformly or non-uniformly arranged between the pressing component return spring receiving hole 403 and the pressing component return spring receiving post 42 in various arrangements.
[0045] The pressing member 40 is disposed on the blocking member 50 at its rear end (i.e., a pressing member extension 402 near the rear side and near the injection actuator 30), such that when the pressing member 40 is pressed down and moves downward, the rear extension 402 of the pressing member 40 drives the blocking member 50 to move downward. The rear extension 402 of the pressing member 40 can rest directly on the blocking member 50 or can be mechanically connected to the blocking member 50, for example by threaded parts, snap-fit, adhesive bonding, riveting, or other connection methods, as long as the transmission of motion and force between the pressing member 40 and the blocking member 50 can be achieved.
[0046] See Figure 7 A perspective view of the blocking member 50 is shown. The blocking member 50 is generally similar in shape to a "door," comprising two vertical arms 501 extending parallel to each other and a horizontal arm 502 extending between the two vertical arms. The pressing member 40 can be disposed on the horizontal arm 502. A groove 503 is provided at the lower end of each vertical arm 501, and the two grooves 503 are symmetrical about the axis of the needle-free injector, i.e., arranged in a mirror image. When aligned with the stop protrusion 304 on the injection actuator 30, the groove allows the stop protrusion 304 and the injection actuator 30 to pass through, as will be described later.
[0047] See Figures 4 to 6 The rear end of the base 21 is provided with two sliding channels 60 for the insertion and movement of the two vertical arms 501 of the blocking member 50. Between the two sliding channels 60 are two blind holes 52 for receiving two blocking member return springs 51. The blocking member return springs 51 are positioned between the horizontal arms 502 of the blocking member 50 and the two blocking member return spring holes 52. A base hole 61 is also provided between the two sliding channels 60, located below the blocking member return spring holes 52, for the injection actuator 30 to pass through.
[0048] It should be noted that the number and position of the blocking member return springs 51 are merely examples and are not limiting; more or fewer blocking member return springs can be provided. For example, the blocking member return spring can be a single spring located at the center of the transverse arm 502, and correspondingly, there is only one blocking member return spring receiving hole 52; the blocking member return springs can also be provided in three, four, or more forms, and the blocking member return spring receiving holes 52 can be provided in three, four, or more forms accordingly. These springs can be uniformly or non-uniformly arranged between the transverse arm 502 and the blocking member return spring receiving holes 52 in various arrangements.
[0049] See Figure 8 and Figure 9 The injection actuator 30 is in the form of a button, including an actuator head 301 and a generally cylindrical actuator body 302 extending vertically from the actuator head 301. Two planes 303 parallel to the axial direction are provided at one end of the actuator body 302 near the actuator head 301. These two planes 303 are symmetrical with respect to the axis of the needleless injector and extend one end to the actuator head 301. The distance between these two planes 303 is equal to the distance between the two sliding channels 60 and equal to the distance between the two vertical arms 501 of the blocking member 50, allowing the injection actuator 30 to pass through the two vertical arms 501 between the actuated and non-actuated positions. Each plane 303 has a stop protrusion 304, the shape and size of which correspond to the groove 503; that is, the size of the stop protrusion 304 can be equal to or smaller than the groove 503, allowing the stop protrusion 304 to pass through the groove 503.
[0050] It should be noted that the figure shows the blocking member 50 having two vertical arms 501, each vertical arm 501 having a groove 503. Correspondingly, the injection actuator 30 has two stop protrusions 304. However, this is only an example and is not restrictive. The number, position, and arrangement of the vertical arms 501, grooves 503, and stop protrusions 304 can vary. For example, the blocking member 50 may have only one vertical arm 501, with a groove 503 on the vertical arm 501, and correspondingly, a stop protrusion 304 on the injection actuator 30; or the blocking member 50 may have two vertical arms 501, but only one of the vertical arms 501 has a groove 503, and correspondingly, a stop protrusion 304 on the injection actuator 30; or, for another example, the blocking member 50 may have two vertical arms 501, each with a groove 503, but these two grooves 503 are asymmetrical with respect to the axis of the needleless injector, and are offset from each other and not aligned, and correspondingly, the two stop protrusions 304 on the injection actuator 30 are also asymmetrical.
[0051] The following is for reference. Figure 10 Describe the operation process of the locking mechanism. Figure 10 The injection actuator 30 is shown in its original position. When the pressing member 40 is pressed down and moves downward, the extension 402 on the rear side of the pressing member 40 drives the blocking member 50 to move downward. This causes the lateral arm 502 of the blocking member 50 to move downward and compress the blocking member return spring 51. At the same time, the two vertical arms 501 of the blocking member 50 move downward in the two sliding channels 60 until they reach the bottom of the sliding channels 60. At this point, the blocking member 50 stops moving and the pressing member 40 reaches its limit position in the downward direction. The groove 503 of the vertical arm 501 aligns with the stop protrusion 304 on the injection actuator 30, allowing the injection actuator 30 to be pressed downward and the stop protrusion 304 to pass through the groove 503. The injection actuator 30 then reaches the actuated position, realizing the injection operation.
[0052] While the injection actuator 30 is pressed, the pressing member 40 remains pressed downwards. When the injection actuator 30 reaches the actuation position, the pressing of the injection actuator 30 is released, and the injection actuator 30 returns to its original unacted position under the action of the elastic member 31, that is, the stop protrusion 304 passes through the groove 503 again and returns to its original position. At this time, the pressing member 40 is released, and the compressed blocking member return spring 51 pushes the blocking member 50 to move upwards. The blocking member 50 pushes the pressing member 40 to move upwards, and at the same time, the pressing member 40 is also pushed upwards by the pressing member return spring 41 until the pressing member extension 402 abuts against the lower surface of the upper cover 211. The pressing member 40 and the blocking member 50 stop moving. At this time, the groove 503 of the vertical arm 501 is not aligned with the stop protrusion 304 on the injection actuator 30, but is offset from each other. At this point, when the injection actuator 30 is pressed again, the stop protrusion 304 is blocked by the vertical arm 501 and cannot move. It can be seen that the default original position of the injection actuator 30 is the unacted position.
[0053] Overall, the locking mechanism is configured to lock the injection actuator 30 in the non-actuated position when locked and allow the injection actuator 30 to move from the non-actuated position to the actuated position when unlocked. In the locked position, the groove 503 is misaligned with the corresponding stop protrusion 304. During unlocking, the pressing member 40 is pressed, driving the blocking member 50 downwards, aligning the groove 503 with the corresponding stop protrusion 304 and allowing the stop protrusion 304 to pass through, thereby allowing the injection actuator 30 to move from the non-actuated position to the actuated position.
[0054] This invention provides a locking mechanism for an injection actuator. The locking mechanism is simple in structure, low in cost, and easy to implement. It can effectively prevent the injection actuator from malfunctioning and ensure that the entire drug aspiration and injection process is executed in the correct sequence.
[0055] The above description of various embodiments of this utility model is provided for descriptive purposes to a person skilled in the art. It is not intended to exclude or limit the utility model to a single disclosed embodiment. As taught above, those skilled in the art will understand that various alternatives and variations of this utility model are possible. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. This utility model is intended to include all alternatives, modifications, and variations of the utility model described herein, as well as other embodiments falling within the spirit and scope of the utility model described above.
[0056] Figure label:
[0057] 100 needle-free injectors
[0058] 10 injection heads
[0059] 11 Drug Management
[0060] 12 piston rods
[0061] 20 needle-free injector body
[0062] 21 bases
[0063] 211 top cover
[0064] 212 Pressing component receiving hole
[0065] 22 Outer casing
[0066] 23 Internal push rod assembly
[0067] 30 injection actuators
[0068] 301 Actuator Head
[0069] 302 actuator body
[0070] 303 Plane
[0071] 304 stop protrusion
[0072] 31 Elastic Components
[0073] 40 Pressing Components
[0074] 401 Pressing Component Main Body
[0075] 402 Pressing Component Extension
[0076] 403 Pressing Component Reset Spring Receiving Hole
[0077] 41 Pressing component return spring
[0078] 42 Pressing component reset spring receiving column
[0079] 50 blocking components
[0080] 501 Vertical Arm
[0081] 502 transverse arm
[0082] 503 Groove
[0083] 51. Blocking component return spring
[0084] 52. Blocking component reset spring receiving hole
[0085] 60 sliding channels
[0086] 61 base holes
Claims
1. A needle-free injector body, comprising: The base (21) has a base hole (61) at its rear end; An injection actuator (30) is inserted into the base (21) through the base hole (61) and is configured to move between an actuated position and a non-actuated position, in which the injection actuator (30) actuates the needleless injector body to perform injection. The needleless injector body is characterized in that it further includes a locking mechanism for the injection actuator (30), the locking mechanism being configured to lock the injection actuator (30) in the non-actuated position in the locked state and allow the injection actuator (30) to move from the non-actuated position to the actuated position in the unlocked state. The locking mechanism includes: A pressing member (40) is provided on the side of the base (21); A blocking member (50) is disposed below one end of the pressing member (40) and includes at least one vertical arm (501), each vertical arm including a groove (503). The injection actuator (30) includes at least one stop protrusion (304). In the locked state, the groove (503) is misaligned with the corresponding stop protrusion (304). When unlocked, the pressing member (40) is pressed, and the pressing member (40) drives the blocking member (50) to move downward, so that the groove (503) aligns with the corresponding stop protrusion (304) and allows the corresponding stop protrusion (304) to pass through, thereby allowing the injection actuator (30) to move from the non-actuated position to the actuated position.
2. The needleless injector body according to claim 1, characterized in that, The blocking member (50) includes two vertical arms (501) and a horizontal arm (502) extending between the two vertical arms (501).
3. The needleless injector body according to claim 2, characterized in that, The injection actuator (30) includes two stop protrusions (304) that can simultaneously align with and pass through the corresponding grooves (503) when the blocking member (50) moves downward.
4. The needleless injector body according to claim 1, characterized in that, At least one sliding channel (60) is provided in the base (21), the number of sliding channels (60) corresponds to the number of vertical arms (501), and the vertical arms (501) move up and down in the corresponding sliding channels (60).
5. The needleless injector body according to claim 4, characterized in that, The base (21) is provided with two sliding channels (60), which are located on both sides of the base hole (61).
6. The needleless injector body according to claim 4, characterized in that, When the vertical arm (501) moves to the bottom of the corresponding sliding channel (60), the groove (503) aligns with the corresponding stop protrusion (304).
7. The needleless injector body according to claim 2, characterized in that, The locking mechanism further includes at least one blocking member return spring (51), and at least one blocking member return spring receiving hole (52) is provided in the base (21). The blocking member return spring (51) is disposed between the transverse arm (502) and the corresponding blocking member return spring receiving hole (52).
8. The needleless injector body according to claim 7, characterized in that, The locking mechanism includes two blocking member return springs (51), and the base (21) is provided with two blocking member return spring receiving holes (52).
9. The needleless injector body according to claim 1, characterized in that, The locking mechanism further includes at least one pressing member reset spring (41), and at least one pressing member reset spring receiving post (42) is also provided on the side of the base (21). The pressing member reset spring (41) is disposed between the pressing member (40) and the corresponding pressing member reset spring receiving post (42).
10. The needleless injector body according to claim 9, characterized in that, The locking mechanism includes two pressing member return springs (41), and two pressing member return spring receiving posts (42) are provided on the side of the base (21).
11. The needleless injector body according to claim 10, characterized in that, Two pressing member reset spring receiving holes (403) are provided on the lower surface of the pressing member (40), and one end of the pressing member reset spring (41) is provided in the corresponding pressing member reset spring receiving hole (403).
12. The needleless injector body according to claim 1, characterized in that, The pressing member (40) includes a pressing member body (401) and two pressing member extensions (402) extending from the pressing member body (401) on both sides.
13. The needleless injector body according to claim 12, characterized in that, The needleless injector body also includes an upper cover (211) disposed above the pressing member (40), the upper cover (211) being fitted to the side of the base (21), and the upper cover (211) being provided with a pressing member receiving hole (212) to receive the pressing member body (401) and expose the pressing member body (401).
14. The needleless injector body according to claim 13, characterized in that, The two pressing member extensions (402) are disposed below the edge of the pressing member receiving hole (212).
15. A needle-free injector, characterized in that, It includes a needleless injector body according to any one of claims 1 to 14 and an injection head mounted on the front end of the needleless injector body.