Needleless injection system

Abstract

The invention relates to a needleless injection system. The needleless injection system comprises an injection assembly, a medicine storage assembly and launching equipment, the injection assembly comprises an injection cavity shell and a piston assembly, and an injection micropore is formed in the far end of the injection cavity shell. The medicine storage assembly comprises a medicine storage cavity shell, a medicine storage cavity is formed in the medicine storage cavity shell, and the near end of the piston rod can be inserted into the medicine storage cavity shell and extend into the medicine storage cavity. The firing device includes a support housing connected to the injection chamber housing and a power push rod connected to the piston assembly, the power push rod being actuatable to move relative to the support housing between an original position and an actuated position, when the power push rod moves from the original position to the actuating position, the piston assembly can be pushed towards the injection micro hole, and when the power push rod moves from the actuating position to the original position, liquid medicine in the medicine storage cavity can be sucked into the injection cavity. According to the scheme, the needleless injection system is more compact in design and simpler and more convenient to install.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to the field of needle-free injection. More specifically, this invention relates to a needle-free injection system. Background Technology

[0002] Existing injection systems sometimes include auxiliary injection devices to assist the injection head in the injection process, which can save manpower to some extent. However, in this case, it is usually necessary to assemble the auxiliary injection device with the injection head. Existing injection systems have too many parts, making the assembly process cumbersome and complex, requiring too much manual intervention from the user, which is inconvenient and may lead to errors and injection failures.

[0003] Therefore, there is a need to provide a needle-free injection system to at least partially solve the above problems. Summary of the Invention

[0004] The needle-free injection system provided by this invention includes: Injection assembly, the injection assembly comprising: An injection chamber housing, which surrounds an injection chamber, has an injection micropore at its distal end; A piston assembly is movably disposed in the injection chamber, wherein the piston assembly includes a piston and a piston rod connected to the proximal end of the piston, the piston rod is provided with a drug liquid channel, and the piston is provided with an internal piston channel that can communicate with the drug liquid channel; A drug storage assembly includes a drug storage chamber housing coaxially disposed with an injection chamber housing. A drug storage chamber is formed within the drug storage chamber housing. The proximal end of a piston rod can be inserted into the drug storage chamber housing and extends into the drug storage chamber, allowing the liquid drug within the drug storage chamber to enter the injection chamber via the liquid drug channel and the piston's internal channel. A launching device is laterally disposed relative to the injection assembly and the drug storage assembly. The launching device includes a support housing and a power push rod. The power push rod is laterally disposed relative to the support housing and is connected to the injection chamber housing. The power push rod is connected to the piston assembly. The power push rod can be actuated to move relative to the support housing between an original position and an actuated position. When the power push rod moves from the original position toward the actuated position, it can push the piston assembly toward the injection micro-orifice. When the power push rod moves from the actuated position toward the original position, it can drive the piston assembly to move away from the injection micro-orifice to draw the drug liquid in the drug storage chamber into the injection chamber.

[0005] Preferably, the drug storage assembly further includes a drug storage piston movably disposed in the drug storage cavity and a drug storage push rod connected to the drug storage piston, wherein the drug storage piston and the drug storage cavity housing together form the drug storage cavity.

[0006] Preferably, the piston rod has a cylindrical retaining portion at its proximal end, and the power push rod is connected to the retaining portion.

[0007] Preferably, the piston rod is provided with a liquid medicine tube inside, the liquid medicine channel is formed in the liquid medicine tube, and a needle-like structure is formed at the proximal end of the liquid medicine tube. The needle-like structure extends into the enclosure and can pierce the sealing member of the storage chamber shell.

[0008] Preferably, the needle-free injection system further includes a sealing assembly, which includes a mounting part and an elastic element. The mounting part can be installed in the enclosure part, and the mounting part is provided with a first through hole and an accommodating space communicating with the first through hole. The elastic element can be installed in the accommodating space, and the elastic element is provided with a second through hole. The needle-like structure can extend through the first through hole and the second through hole and then pierce the sealing part of the drug storage chamber shell.

[0009] Preferably, the distal end of the drug reservoir housing has an elongated portion extending toward the injection assembly, and a sealing member of the drug reservoir housing is disposed on the elongated portion, the elongated portion being able to be snapped into the mounting portion and abut against the proximal end face of the elastic member.

[0010] Preferably, the support housing includes a support body and a first sleeve portion disposed at the distal end of the support body, the first sleeve portion having a first sleeve hole; the power push rod includes a push rod body and a second sleeve portion disposed at the distal end of the push rod body, the second sleeve portion having a second sleeve hole; wherein the injection chamber housing can be sleeved in the first sleeve hole, and the enclosure portion can be sleeved in the second sleeve hole.

[0011] Preferably, the power push rod further includes a boss portion disposed on the push rod body and extending laterally relative to the push rod body, the boss portion abutting against the distal end of the drug storage chamber housing.

[0012] Preferably, the liquid medicine channel extends along the axial direction of the piston rod, the inner channel of the piston extends parallel to the liquid medicine channel, and there is a gap between the inner channel of the piston and the liquid medicine channel in the radial direction about the axis.

[0013] Preferably, the injection assembly further includes a cap removably located at the front end of the injection chamber housing for closing the injection micropore.

[0014] Preferably, the transmitting device further includes a transmitting assembly, the transmitting assembly comprising: A launching rod, which is connected to and can move together with the power push rod, wherein the launching rod is laterally disposed relative to the power push rod, and the central axis of the launching rod is not coaxial with the central axis of the piston assembly; A locking device, comprising a stop having a locked position and an unlocked position, wherein the stop restricts the movement of the launching rod when in the locked position and allows the movement of the launching rod when in the unlocked position; and A driving device includes a driving member and a locking ring connected to the driving member. The locking ring can be driven by the driving member to move axially between a constrained position and a released position. When the locking ring is in the constrained position, it can constrain the stop portion to the locked position. When the locking ring is in the released position, it can release the constraint on the stop portion so that the stop portion can move to the unlocked position.

[0015] Preferably, the driving component is a motor.

[0016] Preferably, the locking device includes a stop seat fixedly connected to the support housing, the stop seat being disposed around the launching rod, the launching rod being provided with a radially inwardly recessed groove, and the stop seat being provided with a stop flange at a position corresponding to the groove. When the stop part is in the locked position, a portion of the stop part is accommodated in the groove and the stop part is located at the proximal end of the stop flange so that the stop flange can prevent the stop part and the launching rod from moving toward the distal end.

[0017] Preferably, when the stop is in the locked position, the projection of the stop on the plane perpendicular to the central axis of the launching rod overlaps with the projection of the groove on the plane; when the stop is in the unlocked position, the projection of the stop on the plane does not overlap with the projection of the groove on the plane.

[0018] Preferably, the locking ring is constructed as a ring shape and has an inner wall portion and a recessed portion that is radially recessed relative to the inner wall portion. When the stop portion is in the locked position, the inner wall portion covers the groove and the stop flange and abuts against the stop portion. When the stop portion is in the unlocked position, the recessed portion covers the groove and the stop flange, and a portion of the stop portion is accommodated in the recessed portion.

[0019] Preferably, the sidewall of the groove has an inclined first guide surface, which is configured to push the stop portion radially outward when the launch rod moves toward the injection micro-orifice, until the stop portion leaves the groove.

[0020] Preferably, the sidewall of the recessed portion has an inclined second guide surface, the second guide surface being configured to push the stop portion radially inward as the locking ring moves from the release position toward the restraint position until the stop portion leaves the recessed portion.

[0021] Preferably, the motor has a motor head that can drive the motor head to rotate, and the motor head and the locking ring are respectively provided with threaded portions that cooperate with each other, the threaded portions being able to convert the rotational motion of the motor head into the linear motion of the locking ring.

[0022] Preferably, the launching device further includes a motor mounting base for mounting the motor, and a first elastic reset member is provided between the motor mounting base and the locking ring. The first elastic reset member is capable of providing elastic force to the locking ring to move from the released position to the constrained position.

[0023] Preferably, the direction of movement of the locking ring is parallel to or coaxial with the direction of movement of the power push rod.

[0024] Preferably, the launching device further includes a power assembly configured to provide power to the power push rod to move in the direction of the injection micro-orifice.

[0025] Preferably, the power assembly includes a gas storage device and a power piston disposed in the gas storage device. The gas storage device is connected to the support housing. One end of the gas storage device is provided with a gas interface for connecting to a high-pressure gas source. The power piston can slide in the gas storage device under the push of the high-pressure gas. The power piston includes a main body and an extension column extending from the main body toward a distal end. The extension column extends through the gas storage device and is connected to the power push rod.

[0026] Preferably, the power assembly further includes a second elastic reset member disposed between the distal end of the main body and the inner wall of the gas storage device.

[0027] The needle-free injection system according to the present invention has the following beneficial effects: 1. The needle-free injection system according to the present invention is more compact in design, and the installation of the drug storage component, injection component and firing device is simpler, which can improve assembly efficiency and reduce costs.

[0028] 2. By using micro-injection holes instead of metal needles, injection pain and psychological fear can be effectively eliminated, which is especially suitable for patients who need long-term drug administration or are sensitive to needles.

[0029] 3. By using a motor as the main driving component, it can achieve rapid response and start-up when the injection operation is desired, which makes it easier for the system to complete multiple injections in a continuous manner, greatly improving injection efficiency and reducing the user's burden.

[0030] 4. The locking device achieves more reliable locking through the mechanical cooperation between the stop and the groove on the launch rod, ensuring that the launch rod is firmly locked in the non-injection state to prevent accidental triggering, and can be accurately and reliably unlocked when injection is required.

[0031] 5. By employing high-pressure gas as a power source, active control over the initial injection pressure and pressure continuity can be achieved, ensuring consistent injection force and allowing for flexible adjustment according to actual requirements. Furthermore, this needle-free injection system combines a controllable power component with a locking release structure, making injection timing even more controllable.

[0032] 6. The dosage adjustment device, through the cooperation of an adjustment disc with dosage grooves of different depths and an adjustment column, transforms dosage setting into an intuitive rotary positioning operation. This structure requires no additional tools, and the adjustment steps are simple, allowing users to quickly and accurately select and lock the predetermined dose. Furthermore, the groove positioning provides clear visual feedback, effectively ensuring the accuracy and consistency of each injection dose, significantly improving user convenience and treatment controllability. Attached Figure Description

[0033] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals in the drawings refer to the same or similar parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0034] Figure 1 This is a three-dimensional schematic diagram of a needle-free injection system according to a preferred embodiment of the present invention; Figure 2 for Figure 1 The front view of the needle-free injection system shown; Figure 3 for Figure 1 A schematic diagram of the firing device for the needle-free injection system is shown. Figure 4 This is a cross-sectional schematic diagram of a needle-free injection system according to a preferred embodiment of the present invention; Figure 5 for Figure 1 A schematic diagram of the needleless injector portion of the needleless injection system shown; Figure 6 for Figure 1 A schematic diagram of the firing assembly portion of the needle-free injection system shown; Figure 7 for Figure 1 A three-dimensional schematic diagram of the power push rod of the needle-free injection system shown in the figure; Figure 8 for Figure 1 A three-dimensional schematic diagram of the support housing of the needle-free injection system shown; Figure 9 for Figure 1 A schematic diagram of the sealing assembly portion of the needle-free injection system shown; Figure 10 for Figure 1 A three-dimensional schematic diagram of the dose adjustment panel of the needle-free injection system shown; and Figure 11 for Figure 1 The diagram shows a three-dimensional representation of the dose axis and limiting plate of the needle-free injection system. Detailed Implementation

[0035] The needle-free injection system according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. The embodiments given below are merely preferred embodiments of the present invention; those skilled in the art can conceive of other ways to implement the invention based on these preferred embodiments, and such other ways also fall within the scope of the present invention.

[0036] This invention provides a needle-free injection system. First, it should be noted that the directional and positional terms used in this invention should be understood as relative directions and relative positions. The directional and positional terms used in this invention can be understood with reference to the accompanying drawings. In this application, "proximal end" refers to the end of the needle-free injection system closest to the operator's hand, i.e., the end furthest from the injection micro-orifice; "distal end" refers to the end of the needle-free injection system furthest from the operator's hand, i.e., the end closest to the injection micro-orifice; and "lateral arrangement" means that two components or their axes are not arranged in series along the same straight line, but rather in a parallel, staggered layout, so that their main axes are parallel but do not coincide.

[0037] Figures 1-2 A needle-free injection system according to a preferred embodiment of the present invention is shown. The needle-free injection system of the present invention enables rapid assembly and, during the assembled injection operation, allows for the rapid injection of the liquid to be injected into the patient through the injection micro-orifice in a very short time.

[0038] The needle-free injection system 100 includes an injection assembly 110, a drug reservoir 120, a sealing assembly, and a dispensing device 130. The injection assembly 110, the drug reservoir 120, and the sealing assembly can be collectively referred to as a needle-free injector. They will be described in detail below.

[0039] Injection Components like Figures 1-4 As shown, the injection assembly 110 is located at the front end of the needle-free injection system 100. In a preferred embodiment, the injection assembly 110 includes an injection chamber housing 111 and a piston assembly 112. The injection chamber housing 111 is generally cylindrical in shape and is made of transparent or translucent glass, COC (cyclic olefin copolymer), or COP (cyclic olefin polymer) material. Its interior forms an injection chamber for containing the drug solution, and its front end has an extremely fine injection micro-orifice 111a (typically with a diameter of about 0.1 mm). When an injection operation is desired, the front end of the injection chamber housing 111 can be pressed against the injection site, such as the patient's skin. When the injection operation is triggered (described below), the drug solution in the injection chamber can be injected into the patient's body through the injection micro-orifice 111a.

[0040] Piston assembly 112 is slidably disposed within the injection chamber. Piston assembly 112 includes a piston 113 and a piston rod 114 fixedly connected to the rear end of piston 113 (i.e., the proximal end of the needle-free injection system). Piston 113 and the inner wall of the injection chamber are sealed and slidably fitted by a sealing ring (not shown). A drug solution channel 114a is provided inside piston rod 114 along its axial direction. An internal piston channel 113a is provided in piston 113 extending parallel to this axial direction. In the preferred embodiment shown, the internal piston channel 113a is arranged parallel to the aforementioned axial direction. It is understood that in other embodiments not shown, the internal piston channel 113a may also be arranged at an angle relative to the aforementioned axial direction.

[0041] In a preferred embodiment, the piston inner channel 113a and the drug channel 114a are spaced apart in the radial direction about the axis, that is, they are not directly axially aligned and connected. This design of the piston inner channel 113a and the drug channel 114a forms a unidirectional flow structure, so that the drug can only flow from the drug storage chamber (described below) to the injection chamber and cannot flow in the reverse direction. During drug aspiration, the injection micro-orifice 111a can be sealed, and a negative pressure is generated in the injection chamber. The negative pressure causes the piston 113 to be displaced or deformed away from the piston rod 114, thereby connecting the piston inner channel 113a and the drug channel 114a, thus forming a drug passage from the drug storage chamber to the injection chamber. During injection, the surface of the piston 113 inside the injection chamber is subjected to the pressure of the drug, which presses the mating surface of the piston 113 and the piston rod 114 together, ensuring that the drug does not flow back into the piston rod 114.

[0042] Preferably, the piston rod 114 has an independent liquid medicine tube 116 embedded in it, and a liquid medicine channel 114a is formed within the tube 116. The liquid medicine tube 116 is preferably made of metal, and its proximal end is machined into a sharp needle-like structure that can pierce the sealing element at the end of the storage chamber housing 121, thereby establishing communication between the storage chamber and the liquid medicine channel 114a. In other embodiments, the liquid medicine channel 114a can also be formed by drilling a hole in the piston rod 114. In this way, the needle-like structure can be configured as a separate structure with an internal flow channel communicating with the liquid medicine channel 114a.

[0043] Preferably, the injection assembly 110 may further include a cap (not shown) that is removably disposed on the distal end of the injection chamber housing 111 to close and protect the injection micropore 111a in the non-use state and during drug aspiration. In one embodiment, a cap protrusion may be provided on the cap, and a drug tube groove may be provided at the front end of the injection chamber housing 111. The cap protrusion and the drug tube groove can engage with each other to facilitate the cap being installed on the injection chamber housing 111.

[0044] During the drug aspiration operation, the cap can be installed at the front end of the injection chamber housing 111, thereby creating a negative pressure in the injection chamber and drawing the drug solution from the drug storage chamber into the injection chamber through the drug solution channel and the piston internal channel. During the injection operation, the cap can be removed and the piston assembly can be controlled to move forward relative to the injection chamber housing 111 to eject the drug solution in the injection chamber through the injection micro-orifice 111a.

[0045] like Figure 5 As shown, a cylindrical enclosure 115 is provided outside the proximal end (rear end) of the piston rod 114. The needle-like structure of the liquid tube 116 extends into the enclosure 115. The enclosure 115 can be connected and positioned with the sealing assembly and the power push rod 132 of the launching device 130 (described below).

[0046] Drug storage components The drug storage assembly 120 is used to pre-store the drug solution to be injected, and the drug storage assembly 120 is coaxially arranged with the injection assembly 110. For example... Figure 4 and Figure 5 As shown, the drug storage assembly 120 includes a drug storage chamber housing 121, a drug storage piston 122, and a drug storage push rod 123.

[0047] A drug storage chamber is formed within the drug storage chamber housing 121. The distal end of the drug storage chamber housing 121 (the end closest to the injection assembly) has an elongated portion 124 extending toward the injection assembly 110. The end of this elongated portion 124 is sealed by a puncturable seal (such as a rubber stopper). The elongated portion 124 can engage and lock with a sealing assembly (described below). A drug storage piston 122 is slidably disposed within the drug storage chamber, its outer edge sealingly fitting against the inner wall of the drug storage chamber housing 121. The drug storage piston 122 and the drug storage chamber housing 121 together form a sealed drug storage chamber. A drug storage push rod 123 is connected to the proximal end of the drug storage piston 122; when the drug storage push rod 123 moves toward the distal end, it can drive the drug storage piston 122 to move, thereby discharging the liquid drug through the punctured seal.

[0048] Sealing components To achieve a sterile, sealed connection between the drug storage assembly 120 and the injection assembly 110, the needle-free injection system 100 also includes a sealing assembly. For example... Figure 5 and Figure 9 As shown, the sealing assembly includes a mounting portion 141 and an elastic element 142.

[0049] The mounting portion 141 can be fixedly installed inside the retaining portion 115 of the piston rod 114. The mounting portion 141 is generally U-shaped and has an internal accommodating space. A first through hole 143 is provided axially on the bottom wall of the mounting portion 141, and the first through hole 143 communicates with the accommodating space. An elastic member 142 is installed in the accommodating space, and the elastic member 142 is preferably made of an elastic material such as silicone. A second through hole 144 is provided at the center of the elastic member 142. In the assembled state of the drug storage assembly 120, the sealing assembly, and the injection assembly 110, the extended portion 124 of the drug storage assembly 120 is inserted into the mounting portion 141, and the sealing member at the distal end of the extended portion 124 is pressed tightly against the proximal end face of the elastic member 142 to form a locking seal. The liquid tube 116 extends through the first through hole 143 and the second through hole 144 and then inserts into the sealing member of the drug storage chamber housing 121. Preferably, the diameter of the second through hole 144 of the elastic element 142 is slightly smaller than the outer diameter of the drug tube 116 to ensure a seal after puncture.

[0050] During assembly, the mounting portion 141 of the sealing assembly is first fixedly installed inside the retaining portion 115 of the piston rod 114 of the injection assembly 110, and the elastic member 142 is installed in the mounting portion 141. Then, the extended portion 124 of the drug storage assembly 120 is aligned and pushed into the mounting portion 141 already installed on the injection assembly, and the sealing member at the end of the extended portion 124 presses against the elastic member 142. During this process, the needle-like structure of the drug liquid tube 116 inside the piston rod 114 passes sequentially through the second through hole 144 of the elastic member 142 and the sealing member at the end of the extended portion 124, extending into the drug storage chamber. Simultaneously, the extended portion 124 is secured in the mounting portion 141, and its sealing member presses against the elastic member 142, forming a reliable sealing connection.

[0051] Launching equipment The launching device 130 is the core of the needle-free injection system for control, power, and dosage adjustment. The launching device 130 is positioned laterally relative to the needle-free injector (i.e., the injection assembly, drug reservoir, and sealing assembly); that is, the launching device 130 is not coaxially aligned with the needle-free injector, but rather positioned to one side of it. This lateral connection ensures that the axis of the launching device is parallel to the axis of the needle-free injector, forming a compact overall structure. The launching device 130 mainly includes a support housing 131, a power push rod 132, a launching assembly 160, a power assembly 170, and a dosage adjustment device 180.

[0052] like Figure 1 , Figure 4 and Figure 8 As shown, the support housing 131 constitutes the main structural frame of the launching device 130. The support housing 131 is laterally disposed relative to the injection cavity housing 111, and its distal end can be connected to the injection cavity housing 111 of the injection assembly 110. In one embodiment, the support housing 131 includes a support body 131a and a first fitting portion 131b disposed at the distal end of the support body 131a. The support body 131a is constructed as an elongated structure with a generally arc-shaped cross-section, and the first fitting portion 131b is generally constructed as an annular structure, which is arranged perpendicularly to the support body 131a. A first fitting hole 131c is provided in the first fitting portion 131b, and the proximal end of the injection cavity housing 111 can be tightly fitted into the first fitting hole 131c to achieve a stable connection. In a preferred embodiment, the first fitting portion 131b and the injection cavity housing 111 can adopt a bayonet-type quick-connect structure. Preferably, the proximal end of the injection cavity housing 111 can also be detached from the first fitting hole 131c.

[0053] In the installed state, the power push rod 132 is disposed within the arcuate contour of the support housing 131 and is axially movable relative to the support housing 131. The power push rod 132 is laterally disposed relative to the support housing 131 and also laterally disposed relative to the injection chamber housing 111, and the distal end of the power push rod 132 can be connected to the piston assembly 112 and can drive the piston assembly 112 to move together. Figure 4 and Figure 7 As shown, the power push rod 132 includes a push rod body 132a and a second sleeve portion 132b disposed at the distal end of the push rod body 132a. The push rod body 132a is constructed as an elongated strip with a roughly arc-shaped cross-section, and the second sleeve portion 132b is constructed as a roughly annular structure, arranged perpendicularly to the push rod body 132a. The second sleeve portion 132b is provided with a second sleeve hole 132c. The retaining portion 115 at the proximal end of the piston rod 114 can be sleeved in the second sleeve hole 132c, thereby achieving linkage. In a preferred embodiment, the second sleeve portion 132b and the retaining portion 115 can adopt a bayonet-type quick-connect structure. Preferably, the piston rod 114 can also be detached from the second sleeve hole 132c. Figure 4 As shown, the power push rod 132 also includes a boss portion 133 disposed on the push rod body 132a and extending laterally relative to the push rod body 132a. In the assembled state of the needleless injection system 100, the boss portion 133 can abut against the proximal end of the drug storage chamber housing 121 of the drug storage assembly 120, serving as axial positioning and support.

[0054] The power push rod 132 also includes an extension flange 187 disposed near the end of the push rod body 132a, the extension flange 187 being arranged perpendicularly to the push rod body 132a for mounting the dose adjustment column 182 of the dose adjustment device 180 (described below).

[0055] The launching assembly 160 can control the launching timing of the power push rod 132, thereby controlling the injection time. That is, when the pressure inside the gas storage device 171 (described below) increases, the liquid medicine in the injection chamber cannot be directly ejected via the power push rod 132; instead, the launching assembly 160 controls the launching time of the power push rod 132. The structure of the launching assembly 160 will be described in detail below. Figure 4 and Figure 6 As shown, the launching assembly 160 includes a launching rod 134, a locking device 135, and a driving device 137. The locking device 135 and the driving device 137 can also be referred to as a "control device", which can control the launching time of the launching rod 134.

[0056] like Figure 6As shown, the launch rod 134 extends generally parallel to the power push rod 132, with its distal end connected to the power push rod 132 and capable of moving synchronously with it. Exemplarily, the launch rod 134 can be connected to the power push rod 132 via threads or snap-fit. Since the launching device 130 is located on one side of the needle-free injector, the central axis of the launch rod 134 is not coaxial with the central axis of the piston assembly. The launch rod 134 has a radially inwardly recessed groove 152, which can be constructed as an annular groove or a non-annular arcuate groove. The proximal inner surface of the sidewall of the groove 152 is machined into an inclined first guide surface 156. When the launch rod 134 is released and moves at high speed to its distal end, the first guide surface 156 contacts the stop portion 136 and uses its inclined surface to smoothly push the stop portion 136 radially outward out of the groove 152.

[0057] Locking device 135 is used to mechanically lock or release launch rod 134. Locking device 135 includes a stop 151 fixedly connected to support housing 131 and a stop portion 136 radially movable. Stop 151 is disposed around launch rod 134 on its outer side. In an axial position corresponding to groove 152 on launch rod 134, stop 151 has an annular stop flange 153 and a radial opening formed therefrom, the radial opening being axially aligned with groove 152. Stop portion 136 may be constructed as a steel ball or other spherical structure, which can be received in groove 152 of launch rod 134 and the corresponding radial opening on stop 151. When stop portion 136 is in the locked position, it is partially received in groove 152 of launch rod 134 under external constraint, and its entirety is located near the proximal end of stop flange 153. At this time, the stop flange 153 can prevent the stop part 136 from moving to the distal end. Since the stop part 136 is stuck in the groove 152, the launching rod 134 is firmly locked. From the projection relationship, the projection of the stop part 136 on the plane perpendicular to the axis of the launching rod 134 overlaps with the projection of the groove 152 on the same plane. When the stop part 136 is in the unlocked position, it moves radially outward and completely disengages from the groove 152. Its projection no longer overlaps with the projection of the groove 152, and the launching rod 134 can be released. When the launching rod 134 is released, it can drive the piston assembly to move forward at high speed in the injection chamber together with the power push rod 132 under the action of power, thereby squeezing the liquid medicine out from the injection micro-hole 111a.

[0058] The drive unit 137 can control the stop 136 to switch between a locked position and an unlocked position. For example... Figure 6As shown, the drive unit 137 includes a motor 138 as a drive element and a locking ring 139 that can be driven by the motor 138. The locking ring 139 is constructed as an annular sleeve structure, which is sleeved on the outside of the stop seat 151 and can move relative to the stop seat 151. Preferably, the direction of movement of the locking ring 139 is parallel or coaxial with the direction of movement of the power push rod 132, so as to make the structure of the needle-free injection system more compact. The inner wall of the locking ring 139 includes an inner wall portion 154 with a smaller inner diameter and a recessed portion 155 that is radially recessed outward relative to the inner wall portion 154. The proximal inner surface of the sidewall of the recessed portion 155 is machined into an inclined second guide surface 157. When the locking ring 139 moves axially to the constrained position under the drive of the motor 138, its inner wall portion 154 exactly covers the area where the groove 152 and the stop flange 153 are located. The inner surface of the inner wall portion 154 presses against and constrains the stop portion 136 radially outward, forcing it to remain in the locked position. When the locking ring 139 moves to the released position, its recessed portion 155 covers the area where the groove 152 and the stop flange 153 are located. The recessed portion 155 provides greater radial space, which can release the radial constraint on the stop portion 136, allowing the stop portion 136 to move radially outward into the recessed portion 155 under the pressure of the first guide surface 156 as the launch rod moves distally, reaching the unlocked position. When the locking ring 139 returns from the released position to the constrained position, the second guide surface 157 contacts the stop portion 136 located in the recessed portion 155 during movement and pushes the stop portion 136 radially inward by its inclined surface until the stop portion 136 leaves the recessed portion 155 and re-enters the groove 152.

[0059] The launching device 130 also includes a motor mounting base 159 disposed in the support housing 131, and a motor 138 is fixedly mounted on the motor mounting base 159. In a preferred embodiment, the motor 138 drives the locking ring 139 to move via a threaded drive. The motor 138 is provided with a motor head 158, which has an external thread with a predetermined pitch, and the inner wall of the locking ring 139 has an internal thread with a predetermined pitch that mates with the external thread. When the motor 138 drives the motor head 158 to rotate, the rotational motion of the motor head 158 can be converted into the axial linear motion of the locking ring 139 through the threaded pair formed by the external and internal threads. For example, when it is desired to drive the locking ring 139 from the constrained position to the released position, the motor head 158 can be driven to rotate forward, thereby driving the locking ring 139 to move axially.

[0060] In a preferred embodiment, when the locking ring 139 is to be driven back from the released position to the constrained position, a first elastic reset member 161 (such as a compression spring) can be provided between the motor mount 159 and the locking ring 139. This first elastic reset member 161 provides an elastic reset force to the locking ring 139 to move it from the released position to the constrained position. As the motor 138 drives the locking ring 139 from the constrained position to the released position, the relative distance between the locking ring 139 and the motor mount 159 decreases, and the first elastic reset member 161 is gradually compressed, thereby storing elastic potential energy. When the locking ring 139 reaches and remains in the released position, the spring is in its maximum compression state. Once the driving force of the motor 138 is withdrawn, the elastic potential energy stored in the first elastic reset member 161 pushes the locking ring 139 to automatically move back from the released position to the constrained position, achieving automatic reset.

[0061] As another reset method, the automatic reset of the locking ring 139 can also be directly controlled by the rotation direction of the motor head 158. For example, when the motor head 158 rotates in the forward direction, the locking ring 139 can be driven to move from the constrained position to the released position through threaded transmission; and when the locking ring 139 needs to be reset to the constrained position, the motor head 158 can be rotated in the reverse direction, thereby driving the locking ring 139 to move from the released position back to the constrained position.

[0062] In a preferred embodiment, the motor 138 of the drive device 137 can be driven and controlled by an integrated control circuit. This control circuit responds to user operation and can be activated via easily accessible physical buttons or a touch panel (not shown) located externally to the support housing 131. When the user presses a button or touches the corresponding interface, an electrical signal is generated. Upon receiving this signal, the control circuit precisely drives the motor 138 to operate according to a preset program, thereby completing the position switching of the locking ring 139 and achieving immediate and reliable control of the injection timing. This external button control method provides users with an intuitive and convenient trigger operation interface, further enhancing the system's usability and user experience.

[0063] The launching device, employing a motor as its primary drive component, enables rapid response and activation upon the intention to perform an injection, allowing the needle-free injection system to complete the injection process in an extremely short time. This not only effectively controls the timing of injections but also reduces operational delays. Furthermore, this solution allows the needle-free injection system to efficiently perform multiple consecutive injections, significantly improving injection efficiency while reducing the user's workload.

[0064] Power components The power unit 170 provides initial driving force for the injection operation. In a preferred embodiment, the power unit 170 is pneumatically driven.

[0065] like Figure 4 As shown, the power assembly 170 includes a gas storage device 171 and a power piston 173. The gas storage device 171 is generally cylindrical and is fixedly connected to the support housing 131, for example, by integral molding or by bolt connection. One end (proximal end) of the gas storage device 171 is provided with a gas interface 172 for connecting to an external high-pressure gas source (e.g., an air pump or compressed gas source). The power piston 173 is disposed within the gas storage device 171 and can slide within the gas storage device 171 along its distal end toward the injection micro-orifice 111a under the push of the high-pressure gas.

[0066] The power piston 173 includes a disc-shaped main body 174 and an extension post 175 extending distally (in the injection direction) from the main body 174. The main body 174 is in a sealed sliding fit with the inner wall of the gas storage device 171. The extension post 175 extends through the distal wall of the gas storage device 171, enters the support housing 131, and connects to the proximal end of the power push rod 132. Exemplarily, the extension post 175 can be connected to the power push rod 132 by means of threaded connection or snap-fit ​​connection. A second elastic reset member 176 (such as a compression spring) is also provided in the gas storage device 171. The second elastic reset member 176 is disposed between the distal end face of the main body 174 of the power piston 173 and the inner wall of the gas storage device 171.

[0067] During the injection operation, high-pressure gas is instantly injected into the gas storage device 171 through the gas interface 172, acting on the main body 174 of the power piston 173 to generate a strong thrust. This thrust pushes the power piston 173, power push rod 132, launch rod 134, and piston assembly 112 together to move towards the distal end of the injection micro-orifice 111a. At this time, the second elastic reset member 176 is in a compressed state. When the injection is completed, the high-pressure gas source can be removed, the gas interface 172 is connected to the atmosphere, and the second elastic reset member 176 is reset. This allows the power piston 173 to be pushed towards the proximal end away from the injection micro-orifice 111a, and drives the power push rod 132, launch rod 134, and piston assembly 112 together to move towards the proximal end. At this time, if the injection micro-hole 111a at the front end of the injection chamber housing 111 is sealed by the cap, a negative pressure will be formed in the injection chamber as the piston 113 retracts. This negative pressure is transmitted to the drug storage chamber, which can draw the drug liquid in the drug storage chamber into the drug liquid channel 114a of the drug liquid tube 116, and into the injection chamber through the piston inner channel 113a, thus completing the drug retrieval (i.e., drug replenishment) process.

[0068] Dosage adjustment device The dosage adjustment device 180 is used to preset the injection dose. For example... Figure 4 , Figure 10 and Figure 11As shown, the dose adjustment device 180 mainly includes a dose adjustment disc 181 and a dose adjustment column 182. The dose adjustment disc 181 is rotatably connected to the support housing 131 via a support shaft 185. In one embodiment, the support shaft 185 is fixedly connected to the dose adjustment disc 181 and extends through the center of the dose adjustment disc 181. Exemplarily, the support shaft 185 and the dose adjustment disc 181 can be fixedly connected by means of threaded connection or interference fit. In a preferred embodiment, a portion of the disc structure of the dose adjustment disc 181 is designed to extend to the outside of the support housing 131. This extension facilitates direct operation by the user. The user can directly rotate the exposed disc structure with their fingers without the need for tools, thereby causing the entire dose adjustment disc 181 to rotate on the support housing 131 to achieve dose selection.

[0069] like Figure 4 As shown, a fixed seat 184 is also provided inside the support housing 131, and the distal end of the support shaft 185 is rotatably inserted into the bearing or shaft hole of the fixed seat 184. A limiting plate 186 is also fixedly connected to the distal end of the support shaft 185. The limiting plate 186 cooperates with the fixed seat 184 and abuts against the distal end face of the fixed seat 184 to axially limit the dose adjustment plate 181.

[0070] A plurality of dose grooves 183 are evenly spaced around the center of the dose adjustment disc 181. The plurality of dose grooves 183 are constructed as blind grooves extending radially on the dose adjustment disc 181, and the depths of the plurality of dose grooves 183 are different from each other, each depth corresponding to a preset injection dose.

[0071] The dose adjustment column 182 is fixedly mounted on the extended flange 187 of the power push rod 132 and extends distally. Before starting the injection operation, the distal end of the dose adjustment column 182 can be aligned with a selected dose groove 183 by rotating the dose adjustment disc 181. The depth of the dose groove 183 determines the limit position that the dose adjustment column 182, the power push rod 132 connected to it, and the power piston 173 can move distally. That is, it sets the "pre-stroke" of the power push rod 132 before firing, thereby setting the effective stroke of the piston assembly in the injection chamber and controlling the amount of drug discharged.

[0072] In a preferred embodiment, clear scale markings corresponding one-to-one with each dose slot 183 can be engraved or marked on the outer surface of the dose adjustment disc 181. When the user rotates the dose adjustment disc 181, the scale value corresponding to the currently selected dose slot 183 can be intuitively observed, thereby quickly and accurately completing the dose setting. This exposed design with visual scale feedback greatly enhances the intuitiveness, convenience, and accuracy of dose adjustment operations, enabling users to easily and reliably preset the required injection dose.

[0073] The assembly and operation process of the needle-free injection system 100 will be described below.

[0074] Assembly: First, the injection assembly and the launching device can be assembled together. Specifically, align the proximal end of the injection chamber housing 111 and fit it into the first fitting hole 131c of the support housing 131 until a secure connection is achieved. Bring the second fitting portion 132b of the power push rod 132 close to the assembled piston assembly 112, and align the retaining portion 115 of the proximal end of the piston rod 114 and fit it into the second fitting hole 132c. This connection method allows the power push rod 132 to be linked with the piston assembly 112.

[0075] Next, the sealing assembly and the drug storage assembly can be assembled. Specifically, the mounting portion 141 of the sealing assembly can be fixedly installed inside the retaining portion 115 of the piston rod 114 of the injection assembly 110, and the elastic member 142 can be installed in the mounting portion 141. Then, the extended portion 124 of the drug storage assembly 120 is aligned and pushed into the mounting portion 141 already installed on the injection assembly. During this process, the needle-like structure of the drug liquid tube 116 inside the piston rod 114 passes through the second through hole 144 of the elastic member 142 and the sealing member at the end of the extended portion 124 in sequence, extending into the drug storage chamber. At the same time, the extended portion 124 is locked in the mounting portion 141, and the sealing member at its end presses against the elastic member 142, forming a reliable sealing connection. At this time, the boss portion 133 on the power push rod 132 should abut against the near end face of the drug storage chamber housing 121 of the drug storage assembly 120. The boss 133 provides axial support for the entire drug storage assembly 120, ensuring connection stability. At this point, the launching device 130 and the needleless injector are assembled. This modular design greatly facilitates rapid assembly before use and maintenance and component replacement after use.

[0076] Dosage setting: Before performing the injection operation, the user can observe the scale marks on the dose adjustment dial 181 and manually rotate the dose adjustment dial 181 to align the distal end of the dose adjustment column 182 with the dose groove 183 with the corresponding scale marks, thereby setting the effective stroke of the power piston 173.

[0077] Injection Trigger: Connect the high-pressure gas source to the gas interface 172. The user can issue an injection command, for example, by pressing the start button on the device housing. The control circuit then drives the motor 138 to rotate rapidly (e.g., forward), instantly pulling the locking ring 139 to the release position via threaded transmission. The recessed portion 155 of the locking ring 139 moves to the stop portion 136, releasing its radial constraint. The stop portion 136 moves outward and disengages from the groove 152, unlocking the firing rod 134. The high-pressure gas pushes the power piston 173 forward at high speed, thereby driving the power push rod 132 and piston assembly 112 forward at high speed, ejecting the liquid medicine in the injection chamber from the injection micro-orifice 111a at extremely high pressure.

[0078] System Reset: After injection, the high-pressure gas source can be removed from the gas interface 172, and the gas interface 172 can be connected to the atmosphere, thereby releasing the residual pressure in the gas storage device 171. Under the restoring force of the second elastic reset member 176, the power piston 173 begins to move to the proximal end (right side) to reset, thereby driving the power push rod 132, the launching rod 134, and the piston assembly 112 connected to it to move to the proximal end together.

[0079] At this time, if the injection micro-hole 111a at the front end of the injection chamber housing 111 is sealed by the cap, a negative pressure will be formed in the injection chamber as the piston 113 retracts. This negative pressure is transmitted to the drug storage chamber, which can draw the drug liquid in the drug storage chamber into the drug liquid channel 114a of the drug liquid tube 116, and into the injection chamber through the piston inner channel 113a, thus completing the drug retrieval (i.e., drug replenishment) process.

[0080] Simultaneously, the locking ring 139 automatically returns from the released position to the constrained position under the action of the first elastic reset member 161. During the movement of the locking ring 139, the second guide surface 157 of its recessed portion 155 contacts and forces the stop portion 136 to move radially inward. When the power piston 173 has fully returned to its original position and the locking ring 139 has also accurately returned to the constrained position, its inner wall portion 154 will press the stop portion 136 back into the groove 152 of the firing rod 134, and the needle-free injection system 100 returns to the locked state, ready for the next injection. Furthermore, the dose adjustment column 182 also resets to its initial position on the right end along with the power push rod 132.

[0081] Based on the needle-free injection system described above, this invention enables efficient, rapid, and automated continuous pneumatic injection. This feature is particularly suitable for treatment scenarios requiring continuous small-dose administration, such as intensive insulin therapy or cosmetic injections.

[0082] In use, once the user assembles all components and sets the initial dosage, the treatment process is simplified to repeatedly pressing the same external button. Each button press results in a precise injection. After injection, when the high-pressure gas is released and the system is connected to the atmosphere, the piston assembly automatically retracts to its original position under the action of the second elastic reset component, simultaneously completing the "drug aspiration" process of drawing the next required medication from the storage chamber. Then, simply pressing the button again triggers the next injection. This process can be performed continuously and rapidly until all the medication in the storage chamber has been injected. The entire process greatly reduces the physical burden of frequent operation for the user, transforming the cumbersome process of traditional manual injection into a simple, repetitive button press, significantly improving treatment efficiency.

[0083] 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.

[0084] The protrusions, grooves, flanges, snaps, and other mating features in the various mating structure groups provided in the above embodiments can be structures that extend and are intermittently arranged in the circumferential direction, or structures that are continuously arranged in the circumferential direction. The injection system can make some structural adjustments accordingly.

[0085] Furthermore, although the embodiments of the present invention are illustrated using a needleless injector, the structure of the present invention can also be applied to needle injectors.

[0086] The above description of various embodiments of the present invention is provided for illustrative purposes to a person skilled in the art. It is not intended to limit the invention to a single disclosed embodiment. As taught above, those skilled in the art will understand various alternatives and variations of the invention. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all alternatives, modifications, and variations of the invention described herein, as well as other embodiments falling within the spirit and scope of the invention described above.

Claims

1. A needle-free injection system (100), characterized in that, The needle-free injection system (100) includes: Injection assembly (110), the injection assembly (110) comprising: An injection chamber housing (111) surrounds an injection chamber, and the distal end of the injection chamber housing (111) has an injection micropore (111a). A piston assembly (112) is movably disposed in the injection chamber, wherein the piston assembly (112) includes a piston (113) and a piston rod (114) connected to the proximal end of the piston (113), wherein a drug channel (114a) is provided in the piston rod (114), and an internal piston channel (113a) is provided on the piston (113) that can communicate with the drug channel (114a). A drug storage assembly (120) includes a drug storage chamber housing (121) coaxially disposed with the injection chamber housing (111). A drug storage chamber is formed within the drug storage chamber housing (121), wherein the proximal end of the piston rod (114) can be inserted into the drug storage chamber housing (121) and extend into the drug storage chamber, allowing the drug solution within the drug storage chamber to enter the injection chamber via the drug solution channel (114a) and the piston internal channel (113a); and A launching device (130) is laterally disposed relative to the injection assembly and the drug storage assembly. The launching device (130) includes a support housing (131) and a power push rod (132). The power push rod (132) is laterally disposed relative to the support housing (131). The support housing (131) is connected to the injection chamber housing (111). The power push rod (132) is connected to the piston assembly (112). The power push rod (132) can be actuated relative to the support housing (131). The support housing (131) moves between an original position and an actuated position, wherein when the power push rod (132) moves from the original position toward the actuated position, it can push the piston assembly (112) toward the injection micro-orifice (111a), and when the power push rod (132) moves from the actuated position toward the original position, it can drive the piston assembly (112) to move away from the injection micro-orifice (111a) so as to draw the drug liquid in the drug storage chamber into the injection chamber.

2. The needle-free injection system (100) according to claim 1, characterized in that, The drug storage assembly (120) further includes a drug storage piston (122) movably disposed in the drug storage cavity and a drug storage push rod (123) connected to the drug storage piston (122). The drug storage piston (122) and the drug storage cavity housing (121) together form the drug storage cavity.

3. The needle-free injection system (100) according to claim 1, characterized in that, The piston rod (114) has a cylindrical enclosure (115) at its proximal end, and the power push rod (132) is connected to the enclosure (115).

4. The needle-free injection system (100) according to claim 3, characterized in that, The piston rod (114) is provided with a liquid tube (116) inside, and the liquid channel (114a) is formed in the liquid tube (116). A needle-like structure is formed at the proximal end of the liquid tube (116), and the needle-like structure extends into the enclosure (115) and can pierce the sealing member of the storage chamber shell (121).

5. The needle-free injection system (100) according to claim 4, characterized in that, The needleless injection system (100) further includes a sealing assembly, which includes a mounting part (141) and an elastic element (142). The mounting part (141) can be installed in the enclosure part (115). The mounting part (141) is provided with a first through hole (143) and an accommodating space communicating with the first through hole (143). The elastic element (142) can be installed in the accommodating space. The elastic element (142) is provided with a second through hole (144). The needle-like structure can extend through the first through hole (143) and the second through hole (144) and then pierce the sealing part of the drug storage chamber housing (121).

6. The needle-free injection system (100) according to claim 5, characterized in that, The distal end of the drug reservoir housing (121) has an elongated portion (124) extending toward the injection assembly (110), and a sealing member of the drug reservoir housing (121) is disposed on the elongated portion (124). The elongated portion (124) can be snapped into the mounting portion (141) and abut against the proximal end face of the elastic member (142).

7. The needle-free injection system (100) according to claim 3, characterized in that, The support housing (131) includes a support body (131a) and a first sleeve portion (131b) disposed at the distal end of the support body (131a). The first sleeve portion (131b) is provided with a first sleeve hole (131c). The power push rod (132) includes a push rod body (132a) and a second sleeve portion (132b) disposed at the distal end of the push rod body (132a). The second sleeve portion (132b) is provided with a second sleeve hole (132c). The injection chamber housing (111) can be sleeved in the first sleeve hole (131c), and the enclosure portion (115) can be sleeved in the second sleeve hole (132c).

8. The needle-free injection system (100) according to claim 7, characterized in that, The power push rod (132) also includes a boss (133) disposed on the push rod body (132a) and extending laterally relative to the push rod body (132a), the boss (133) abutting against the distal end of the drug storage chamber housing (121).

9. The needle-free injection system (100) according to claim 1, characterized in that, The liquid medicine channel (114a) extends along the axial direction of the piston rod (114), the inner piston channel (113a) extends parallel to the liquid medicine channel (114a), and there is a gap between the inner piston channel (113a) and the liquid medicine channel (114a) in the radial direction about the axis.

10. The needle-free injection system (100) according to claim 1, characterized in that, The injection assembly (110) also includes a cap removably located at the front end of the injection chamber housing (111) for closing the injection micropore (111a).

11. The needle-free injection system (100) according to claim 1, characterized in that, The transmitting device (130) further includes a transmitting assembly (160), which includes: Launch rod (134), the launch rod (134) is connected to the power push rod (132) and can move together with the power push rod (132), wherein the launch rod is arranged laterally relative to the power push rod, and the central axis of the launch rod is not coaxial with the central axis of the piston assembly; A locking device (135) includes a stop (136) having a locked position and an unlocked position. When the stop (136) is in the locked position, it restricts the movement of the launching rod (134); when the stop (136) is in the unlocked position, it allows the movement of the launching rod (134). A drive device (137) includes a drive member and a locking ring (139) connected to the drive member. The locking ring (139) can be driven by the drive member to move axially between a constrained position and a released position. When the locking ring (139) is in the constrained position, it can constrain the stop (136) in the locked position. When the locking ring (139) is in the released position, it can release the constraint on the stop (136) so that the stop (136) can move to the unlocked position.

12. The needle-free injection system (100) according to claim 11, characterized in that, The driving component is a motor (138).

13. The needle-free injection system (100) according to claim 11, characterized in that, The locking device (135) includes a stop seat (151) fixedly connected to the support housing (131). The stop seat (151) is arranged around the launching rod (134). The launching rod (134) is provided with a radially inward recessed groove (152). The stop seat (151) is provided with a stop flange (153) at a position corresponding to the groove (152). When the stop part (136) is in the locked position, a portion of the stop part (136) is accommodated in the groove (152) and the stop part (136) is located at the proximal end of the stop flange (153) so that the stop flange (153) can prevent the stop part (136) and the launching rod (134) from moving toward the distal end.

14. The needle-free injection system (100) according to claim 13, characterized in that, When the stop (136) is in the locked position, the projection of the stop (136) on the plane perpendicular to the central axis of the launch rod (134) overlaps with the projection of the groove (152) on the plane. When the stop (136) is in the unlocked position, the projection of the stop (136) on the plane does not overlap with the projection of the groove (152) on the plane.

15. The needle-free injection system (100) according to claim 13, characterized in that, The locking ring (139) is constructed as a ring structure and has an inner wall portion (154) and a recessed portion (155) that is radially recessed outward relative to the inner wall portion (154). When the stop portion (136) is in the locked position, the inner wall portion (154) covers the groove (152) and the stop flange (153) and abuts against the stop portion (136). When the stop portion (136) is in the unlocked position, the recessed portion (155) covers the groove (152) and the stop flange (153) and a portion of the stop portion (136) is accommodated in the recessed portion (155).

16. The needle-free injection system (100) according to claim 13, characterized in that, The sidewall of the groove (152) has an inclined first guide surface (156) configured to push the stop (136) radially outward when the launch rod (134) moves toward the injection micro-hole (111a) until the stop (136) leaves the groove (152).

17. The needle-free injection system (100) according to claim 15, characterized in that, The sidewall of the recessed portion (155) has an inclined second guide surface (157) configured to push the stop (136) radially inward as the locking ring (139) moves from the release position toward the restraint position until the stop (136) leaves the recessed portion (155).

18. The needle-free injection system (100) according to claim 12, characterized in that, The motor (138) has a motor head (158) that can drive the motor head (158) to rotate. The motor head (158) and the locking ring (139) are respectively provided with threaded portions that cooperate with each other. The threaded portions can convert the rotational motion of the motor head (158) into the linear motion of the locking ring (139).

19. The needle-free injection system (100) according to claim 12, characterized in that, The launching device (130) further includes a motor mounting base (159) for mounting the motor (138), and a first elastic reset member (161) is provided between the motor mounting base (159) and the locking ring (139). The first elastic reset member (161) is capable of providing the locking ring (139) with an elastic force that moves it from the released position to the constrained position.

20. The needle-free injection system (100) according to claim 11, characterized in that, The direction of movement of the locking ring (139) is parallel or coaxial with the direction of movement of the power push rod (132).

21. The needle-free injection system (100) according to claim 1, characterized in that, The launching device (130) also includes a power assembly (170) configured to provide power to the power push rod (132) to move toward the injection micro-orifice (111a).

22. The needle-free injection system (100) according to claim 21, characterized in that, The power assembly (170) includes a gas storage device (171) and a power piston (173) disposed in the gas storage device (171). The gas storage device (171) is connected to the support housing (131). One end of the gas storage device (171) is provided with a gas interface (172) for connecting to a high-pressure gas source. The power piston (173) can slide in the gas storage device (171) under the push of the high-pressure gas. The power piston (173) includes a main body (174) and an extension column (175) extending from the main body (174) toward the distal end. The extension column (175) extends through the gas storage device (171) and is connected to the power push rod (132).

23. The needle-free injection system (100) according to claim 22, characterized in that, The power assembly (170) also includes a second elastic reset member (176), which is disposed between the distal end of the main body (174) and the inner wall of the gas storage device (171).

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