Needle-free injector body and needle-free injector

Abstract

The utility model relates to a needleless injector main part and needleless injector, wherein, the needleless injector main part includes first component and the second component that can with first component opposite movement, wherein, the needleless injector main part still includes the first auxiliary device for providing visual feedback, the first auxiliary device includes: at least one dose mark, at least one dose mark sets up on the outer surface of second component, first opening, first opening sets up on first component and visual enhancement element, visual enhancement element is fixed on first component and is positioned to align first opening, wherein, in the process of first component and second component relative motion, at least one dose mark aligns first opening in turn and is optically magnified by visual enhancement element. The needleless injector includes injection head and the needleless injector main part.

Description

Technical Field

[0001] This utility model relates to a medical device for injecting liquid medicines. More specifically, this utility model relates to a needleless injector body and a needleless injector having the needleless injector body. Background Technology

[0002] A needle-free injector is a medical device that injects liquid medication into a patient's body through a micro-orifice at its tip by applying high pressure. Because needle-free injectors do not have a needle, they eliminate the pain of needle pricks, effectively improving patient compliance.

[0003] Needle-free injectors typically consist of an injection head and a needle-free injector body. The needle-free injector body includes a first component and a second component capable of relative movement with respect to the first component. The use of a needle-free injector generally includes a pressurization step, a drug aspiration step, and an injection step. During the drug aspiration step, the user manually operates the needle-free injector body, causing the first component to move relative to the second component. This moves the piston rod in the injection tube of the injection head relative to the injection tube, thereby causing the injection tube to draw in the drug to be injected. During this process, the user can see the drug to be injected in the injection tube through the essentially transparent injection tube, but cannot accurately and promptly control the amount of drug drawn in.

[0004] One known solution is to mark graduations on the syringe to indicate the amount of medication to be inhaled. However, needle-free syringes are typically used by patients themselves, and most patients lack the syringe handling skills of healthcare professionals, thus limiting their ability to accurately control the amount of medication inhaled based on the graduations on the syringe.

[0005] In addition, some patients have pre-existing visual impairments. For example, diabetic patients are among the potential users of needle-free injectors, but they often experience vision loss due to diabetes. In such cases, the small size of the syringe tube, with its small markings that are easily obscured by the piston, makes it very difficult for patients to read. Utility Model Content

[0006] To overcome the above defects, this utility model proposes a needleless injector body with an auxiliary device that can provide feedback to the patient in a reinforced visual feedback manner on the amount of the injectable material drawn into the injection tube.

[0007] This auxiliary device is designed based on the understanding that during drug aspiration, the amount of relative movement between the first and second components of the needle-free injector body is proportional to the amount of drug aspirated by the syringe. Therefore, the auxiliary device indicates the amount of drug aspirated by the user by providing feedback on the amount of relative movement between the first and second components. The advantage of this feedback is that, relative to the limited space on the syringe, the auxiliary device can be placed in a larger space between the first and second components to obtain enhanced visual feedback. This enhanced visual feedback includes at least one of the following forms: clearer visual feedback, more precise visual feedback, and feedback based on visual feedback supplemented by other forms of feedback (e.g., tactile feedback and / or auditory feedback).

[0008] According to one aspect of the present invention, the needle-free injector body includes a first component and a second component capable of relative movement with respect to the first component, wherein the needle-free injector body includes a first auxiliary device for providing visual feedback, the first auxiliary device including: at least one dose mark disposed on the outer surface of the second component; a first opening disposed on the side wall of the first component; and a visual enhancement element positioned to align with the first opening, wherein, during relative movement between the first component and the second component, the at least one dose mark sequentially aligns with the first opening and is optically magnified by the visual enhancement element.

[0009] When the first component and the second component move relative to each other, the dosage mark will align with the first opening in sequence and be optically magnified by the visual enhancement element, thereby showing the operator more clearly the amount of medicine drawn into the syringe at this time, so that the operator can stop the operation when the predetermined amount of medicine is reached.

[0010] In one embodiment, the first auxiliary device may include a plurality of dose markers equidistantly arranged along the axial direction. This is particularly effective when the needle-free injector having the needle-free injector body is a translational aspiration needle-free injector. In a translational aspiration needle-free injector, the first component of the needle-free injector body undergoes only translational movement relative to the second component, thereby allowing a plurality of dose markers to be positioned on the second component along the axial direction according to the position of the first opening. These dose markers are equidistantly arranged to display individual drug doses with a fixed dose difference, which is the resolution of the first auxiliary device. Preferably, the first auxiliary device is configured to have a resolution of 0.005 ml, 0.01 ml, 0.02 ml, 0.05 ml, or 0.1 ml. With the cross-sectional area of ​​the injection tube remaining constant, this resolution is determined solely by the axial distance between adjacent dose markers among the plurality of dose markers. Here, "adjacent dose markers" refers to dose markers that are adjacent in alignment order among those sequentially aligned with the first opening. Therefore, the closer the plurality of dose markers are arranged axially, the higher (and smaller) the resolution of the first auxiliary device. However, the density among multiple dose markers is limited by the size of the markers themselves. Therefore, employing a rotary needle-free injector and evenly distributing multiple dose markers circumferentially is beneficial for further improving the resolution of the first auxiliary device.

[0011] In one embodiment, the first component has an internal thread, and the second component has an external thread that mates with the internal thread. The first and second components move relative to each other along a helical path through the engagement of the internal and external threads. In this case, the needle-free injector with this needle-free injector body is a rotary aspiration needle-free injector. The rotary aspiration needle-free injector converts the horizontal movement between the piston rod and the injection tube into a helical movement between the first and second components, thereby replacing a shorter axial displacement with a longer helical displacement, thus improving operational accuracy.

[0012] In this configuration, it is preferable to provide multiple dose markers, which are equidistantly arranged along a spiral line corresponding to the spiral. When equidistantly arranged along the spiral, if one dose marker is provided for each revolution along the spiral, the multiple dose markers form a column extending axially on the second component, with the distance between each dose marker equal to the pitch. If multiple dose markers are uniformly provided for each revolution along the spiral, the multiple dose markers form multiple columns extending axially on the second component, with the columns evenly distributed circumferentially on the second component, and the distance between the dose markers in each column equal to the pitch.

[0013] Preferably, the plurality of dosage markings are numbers that increase equally along the spiral, thereby visually displaying the dosage to the operator.

[0014] Preferably, the at least one dosage mark is formed on the second component by a molding process or a surface treatment process. Surface treatment processes include etching, engraving, spraying, etc.

[0015] Preferably, the visual enhancement element includes a lens portion and a fixing portion, wherein the visual enhancement element optically magnifies the at least one dose mark through the lens portion and is fixed to a receiving seat on the outer surface of the first component through the fixing portion.

[0016] Preferably, the lens portion is formed by a single convex lens or is composed of multiple lenses.

[0017] Preferably, the fixing part is constructed as an annular flange, and the needleless injector body further includes a first cap for covering the first opening, the annular wall of the first cap pressing against the annular flange to fix the visual enhancement element in the receiving seat of the first component.

[0018] Preferably, the needleless injector body may further include a second auxiliary device for providing tactile feedback and / or auditory feedback. The second auxiliary device includes a first feedback member and a second feedback member. The first feedback member is disposed on the first member and moves together with the first member. The second feedback member is disposed on the second member and moves together with the second member. When the first member and the second member move relative to each other, the first feedback member and the second feedback member interact to provide tactile feedback and / or auditory feedback.

[0019] The first feedback member and the second feedback member are configured to interact with each other in one or more ways, such as collision, contact, friction, and elastic deformation, and thus generate one or more tactile feedbacks, such as changes in velocity, changes in friction, changes in torque, and vibration. Furthermore, sound can be emitted through the aforementioned interactions, forming auditory feedback.

[0020] Preferably, the first auxiliary device and the second feedback member are configured such that the visual feedback of the first auxiliary device and the tactile and / or auditory feedback of the second auxiliary device are at least partially synchronized. That is, at least one visual feedback and a corresponding tactile and / or auditory feedback occur simultaneously, thereby enhancing the visual feedback through the tactile and / or auditory feedback. For example, typically when the dosage mark of the first auxiliary device is centered in the first opening, it indicates that the amount of medication inhaled in the syringe has reached the value indicated by the dosage mark. However, this determination of centeredness is not precise enough, while synchronized tactile and / or auditory feedback can provide more accurate indication. Therefore, based on visual feedback supplemented by synchronized tactile and / or auditory feedback, the dosage can be more accurately indicated to the operator.

[0021] More preferably, the first auxiliary device and the second feedback member are configured such that each visual feedback in the visual feedback of the first auxiliary device is synchronized with the corresponding tactile feedback and / or auditory feedback in the tactile feedback and / or auditory feedback of the second auxiliary device.

[0022] This synchronization is primarily achieved through the correspondence between the positional relationship between the dose markers arranged on the second component and the second feedback component.

[0023] In one embodiment, the second feedback member may include a substantially uniform cylindrical outer surface and one or more ribs or grooves extending axially on the outer surface. To achieve synchronization of visual feedback with tactile and / or auditory feedback, one of the one or more ribs or grooves may be positioned on the same straight line as the at least one dose marker.

[0024] In another embodiment, the second feedback component may include a plurality of ribs or grooves evenly distributed circumferentially on the second component. To achieve synchronization of visual feedback with tactile and / or auditory feedback, a plurality of dose markers of the first auxiliary device may be arranged equidistantly along helices corresponding to the helices of the internal and external threads, forming a plurality of columns extending axially, with each of the plurality of ribs or grooves aligned with a corresponding column of the plurality of columns.

[0025] The more ribs or grooves that serve as the second feedback component, the higher the resolution of the second auxiliary device; conversely, the lower the resolution of the second auxiliary device, the lower the resolution. The resolution of the second auxiliary device is preferably designed to be 0.005 ml, 0.01 ml, 0.02 ml, 0.025 ml, 0.05 ml, or 0.1 ml, that is, the amount of inhaled medication varies by 0.005 ml, 0.01 ml, 0.02 ml, 0.025 ml, 0.05 ml, or 0.1 ml between two adjacent tactile and / or auditory feedback responses.

[0026] Preferably, the resolution of the first auxiliary device can be designed to be the same as that of the second auxiliary device. In this case, each visual feedback is accompanied by corresponding tactile feedback and / or auditory feedback.

[0027] Alternatively, the resolution of the first assistive device can be designed to be an integer multiple of the resolution of the second assistive device, in which case tactile feedback and / or auditory feedback can provide more precise fine-tuning between two visual feedbacks.

[0028] Preferably, the second feedback component is integrally constructed with the second component. This design can reduce the manufacturing cost of the second feedback component and reduce assembly steps.

[0029] Preferably, the first feedback member is constructed as an elastic member. The second feedback member constructed in the manner described above causes the first feedback member to undergo an elastic deformation once for every predetermined distance the first member moves relative to the second member.

[0030] Preferably, the elastic member serving as the first feedback member may include a spring plunger and a base, the base having a receiving portion for accommodating the spring plunger, and the spring plunger being disposed on the first member via the base. The spring plunger is typically a standard part, offering advantages such as availability, reliability, and low cost. By rationally designing the shape of the base, the spring plunger can be disposed on the first member in a desired manner.

[0031] Preferably, the base of the elastic member is configured with at least one axial stop surface, at least one circumferential stop surface and at least one radial stop surface, and the first member is configured with at least one axial stop mating surface that mates with the at least one axial stop surface, at least one circumferential stop mating surface that mates with the at least one circumferential stop surface and at least one radial stop mating surface that mates with the at least one radial stop surface.

[0032] By engaging the stop surface and the stop mating surface, the elastic member can be fixed to the first member in the axial, circumferential, and radial directions, or the elastic member can be easily positioned on the first member for easy assembly.

[0033] In a preferred embodiment, for mounting the elastic member, the first member is provided with a first opening, the first opening including an insertion side and a mounting side, the first opening having a narrowed edge on the mounting side, and the base of the elastic member having at least one flange, wherein the elastic member can be inserted into the first opening from the insertion side of the first opening and slide to the mounting side of the first opening, such that the narrowed edge of the first opening and at least one flange of the base of the elastic member cooperate to prevent the elastic member from moving away from the second member.

[0034] More preferably, the base of the elastic member is provided with at least a pair of radially spaced flanges, wherein the elastic member can be inserted into the first opening from the insertion side of the first opening and slide to the mounting side of the first opening, such that the narrowed edge of the first opening is engaged between at least a pair of flanges of the base of the elastic member to prevent the elastic member from moving toward the second member and away from the second member.

[0035] Preferably, the needleless injector body further includes a first cap for covering the first opening. The first cap is provided with a protrusion. When the first cap covers the first opening, the protrusion of the first cap extends into the insertion side of the first opening and prevents the elastic member installed in the mounting side of the first opening from sliding out of the mounting side.

[0036] In one embodiment, the first feedback member includes two opposing elastic members. The two opposing elastic members can apply radially symmetrical support forces to the second member, giving the second member better centering.

[0037] In another embodiment, the first feedback member includes only one elastic member, and the needle-free injector body has a stop member disposed on the first member opposite to the elastic member, the radial dimension of the stop member being smaller than the radial dimension of the elastic member. The stop member also provides radial support to the second member to ensure its alignment. Simultaneously, the stop member reduces the radial dimension of the needle-free injector body, making it easier for the operator to hold.

[0038] Similar to the method of installing an elastic member, in order to install a stop, the first member is provided with a second opening, the second opening including an insertion side and an installation side, the second opening having a narrowed edge on the installation side, and the stop having at least a pair of radially spaced flanges, wherein the stop can be inserted into the second opening from the insertion side of the second opening and slide to the installation side of the second opening, such that the edge of the second opening is engaged between the at least a pair of radially spaced flanges of the stop to prevent the stop from moving toward and away from the second member.

[0039] Preferably, the needleless injector body further includes a second cap for covering the second opening, the second cap having a protrusion, wherein when the second cap covers the second opening, the protrusion of the second cap extends into the insertion side of the second opening and prevents a stop installed in the mounting side of the second opening from sliding out from the mounting side.

[0040] Preferably, the external thread has a side end face facing the circumferential direction at its front end. When the second component rotates relative to the first component and translates forward, the side end face of the external thread eventually abuts against the abutment surface of the first feedback component or the stop component, which faces opposite to the side end face, thereby preventing the second component from rotating further relative to the first component. This effectively prevents the second component from disengaging from the first component, and compared to abutment in the axial direction, abutment in the circumferential direction can effectively reduce the force on the side end face and the abutment surface during abutment, thereby preventing deformation of the side end face and the abutment surface.

[0041] According to another aspect of this invention, a needle-free injector is also provided, which has an injection head and the aforementioned needle-free injector body. The injection head has an injection tube and a piston rod disposed in the injection tube. The piston rod can be connected to a first component or a second component of the needle-free injector body, such that the relative movement of the first component and the second component can cause the piston rod to move relative to the injection tube, thereby drawing in the injectable material. This needle-free injector therefore possesses the aforementioned advantages. Attached Figure Description

[0042] 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.

[0043] Figure 1A longitudinal cross-sectional view of a first embodiment of the needleless injector according to the present invention is shown;

[0044] Figure 2 It shows Figure 1 A partially exploded view of the main body of the needleless injector in the image.

[0045] Figure 3 It shows Figure 1 A perspective view of the base of the first feedback component of the second auxiliary device of the needleless injector body in the needleless injector.

[0046] Figure 4 A longitudinal cross-sectional view of a second embodiment of the needleless injector according to the present invention is shown;

[0047] Figure 5 It shows Figure 4 A partially exploded view of the main body of the needleless injector in the image.

[0048] Figure 6 It shows Figure 4 A perspective view of the first component of the needleless injector body in a needleless injector;

[0049] Figure 7 It shows Figure 4 A perspective view of the base of the first feedback component of the second auxiliary device of the needleless injector body in the needleless injector.

[0050] Figure 8 It shows Figure 4 A three-dimensional view of the first cap of the needleless injector body in the needleless injector;

[0051] Figure 9 A longitudinal cross-sectional view of a third embodiment of the needleless injector according to the present invention is shown;

[0052] Figure 10 It shows Figure 9 A perspective view of the first component of the needleless injector body in a needleless injector;

[0053] Figure 11 It shows Figure 9 A perspective view of the stop component of the needle-free injector body; and

[0054] Figure 12 It shows Figure 9 A perspective view of the second cap of the needleless injector body in the needleless injector. Detailed Implementation

[0055] Referring now to the accompanying drawings, the specific embodiments of this utility model will be described in detail using a rotary aspiration needleless injector as an example. The description herein is merely a preferred embodiment of this utility model. Those skilled in the art can conceive of other ways to implement this utility model based on the preferred embodiments, such as implementing this utility model on a translational aspiration needleless injector; these other ways also fall within the scope of this utility model.

[0056] The "axial direction" mentioned in this article can be understood as the direction of the axis A1 of the needle-free injector. In this axial direction, the direction towards the patient when using the needle-free injector is called "front," and the opposite direction is called "back." The "radial direction" mentioned in this article refers to the radial direction relative to the aforementioned axial direction. Figure 2 and Figure 5 The axis is represented by A2 and A3. A2 and A3 can be the same axis or axes spaced apart axially. In the radial direction, the direction toward axis A1 is called "inner", while the opposite direction is called "outer".

[0057] Figure 1 A longitudinal cross-sectional view of a first embodiment of a rotary aspiration needleless injector according to the present invention is shown, wherein the needleless injector includes an injection head 2 located at the front end and a needleless injector body 3 located at the rear end.

[0058] The injection head 2 includes an injection tube 21 and a piston rod 22 disposed within the injection tube 21. The injection tube 21 has a chamber with an open rear end, and an injection micro-hole 211 is formed at the front end of the injection tube 21, communicating with the outside of the chamber. The front end of the piston rod 22 is inserted into the chamber of the injection tube 21, and a connecting portion 221 is formed at the rear end of the piston rod 22. In this embodiment, the connecting portion 221 is configured as a snap-fit.

[0059] The needle-free injector body 3 includes a first component 31, a second component 32, and a plunger 33. The first component 31 is generally cylindrical and is connected to the injection tube 21 at its front end. The first component 31 has a first circumferential sidewall with an internal thread 313 on its inner side. The second component 32 is at least partially disposed inside the first component 31 and is generally cylindrical, having a second circumferential sidewall with an external thread 323 on its outer side. The internal thread 313 engages with the external thread 323, allowing helical motion between the first component 31 and the second component 32. That is, the first component 31 can be translated relative to the second component 32 by rotating the first component 31 relative to the second component 32.

[0060] The push rod 33 is arranged inside the second component 32 and is constructed in a rod shape. The push rod 33 has a mating connection part 331 at its front end, which can be detachably connected to the connection part 221 of the piston rod 22, or more precisely, in this case, a snap-fit ​​connection. The push rod 33 has a locking member 332 at its rear end, which has a flange 333 at its rear end. The flange 333 can be blocked by the limiting member 334, so that the push rod 33 is fixed to the second component 32 in the axial direction A1 via the locking member 332, the limiting member 334, and the intermediate member 335.

[0061] During medication administration, the vial 1 is placed in the vial base 11, which is fixed to the injection tube 21. The medication in the vial 1 is connected to the chamber of the injection tube 21 via the needle-piercing part 12 of the vial base 11 and the injection micro-hole 211 of the injection tube 21. Figure 1 In the state shown, by rotating the first component 31 of the needleless injector body 3 relative to the second component 32 (achieved by the base 34 fixed to the second component 32), the push rod 33 drives the piston rod 22 to move backward, thereby creating a vacuum in the injection tube 21 and thus drawing liquid medicine from the vial 1.

[0062] In order to provide feedback to the operator on the amount of medication inhaled in the injection tube 21 during the inhalation process, the needleless injector body 3 also includes a first auxiliary device. The following is in conjunction with... Figure 2 and Figure 3 The specific structure of the first auxiliary device in the first embodiment will be described in further detail.

[0063] Figure 2 It shows Figure 1 The exploded view of the needleless injector body 3 of the needleless injector body 3 shows that the base 34 of the needleless injector body 3 is translated backward along the axial direction A1 and the first component 31 is translated forward along the axial direction A1, so that the second component 32 is visible.

[0064] The needleless injector body 3 includes a first auxiliary device for providing visual feedback, the first auxiliary device including dose marks 326a and 326b disposed on the outer surface of the second member 32, a first opening 316 disposed in the receiving seat 317 of the first member 31, and a visual enhancement element 37 disposed in the receiving seat 317 and aligned with the first opening 316.

[0065] Dosage marks 326a and 326b are arranged at the front of the external thread 323 of the second component 32. Dosage marks 326a and 326b can be integrally formed with the second component 32 by molding, or they can be formed on the second component 32 in an additional step by surface treatment processes such as etching, engraving, or spraying. The number of dosage marks can be set to at least one, preferably multiple. Dosage marks 326a are a plurality of numbers equidistantly arranged along the axial direction, the distance between these numbers being an integer multiple of the pitch of the internal thread 313 and the external thread 323. When the first component 31 moves relative to the second component 32 to draw medication into the injection tube 21, each number sequentially aligns with the first opening 316. The aligned number is observed by the operator through the first opening 316, thus providing visual feedback to the operator informing them of the amount of medication drawn into the injection tube 21 at this time. For example, in the current embodiment, dosage marks 326a include the numbers 30, 40, and 50, which represent the amounts of medication drawn into the injection tube as 0.3 ml, 0.4 ml, and 0.5 ml, respectively. Therefore, the resolution of the first auxiliary device is 0.1 ml. The dosage mark 326b is a symbol that, when aligned with the first opening 316, represents a dosage of 0 inhaled in the syringe 21. Therefore, this symbol can also be replaced by the number 0.

[0066] The visual enhancement element 37 includes a lens portion for optically magnifying dose marks 326a and 326b and a fixing portion for fixing it in a receiving seat 317 of the first member 31. The lens portion is preferably constructed as a single convex lens, but may also be composed of a combination of multiple lenses. The fixing portion of the visual enhancement element 37 may be fixed in the receiving seat 317 of the first member 31 by snap-fit, welding, or interference fit.

[0067] During the relative movement between the first component and the second component, each of the at least one dose marker is sequentially aligned with the opening and optically magnified by the visual enhancement element.

[0068] Furthermore, the needle-free injector body 3 may also include a second auxiliary device for providing tactile and / or auditory feedback. This second auxiliary device includes a first feedback member 35 and a second feedback member 36. The first feedback member 35 is disposed on and moves together with the first member 31, and the second feedback member 36 is disposed on and moves together with the second member 32. When the first member 31 and the second member 32 move relative to each other, the first feedback member 35 and the second feedback member 36 interact to provide tactile and / or auditory feedback to the operator.

[0069] The first feedback member 35 includes two opposing elastic members, each preferably having a spring plunger 351 and a base 352. The spring plunger 351 has a ball 3511 movable along a radial axis A2 or A3 and a plunger seat 3512 that at least partially accommodates the ball 3511. The ball 3511 is connected to the plunger seat 3512 by a spring (not shown), such that the ball 3511 protrudes radially inward under the spring force and retracts into the plunger seat 3512 when subjected to a radially outward force exceeding the spring force. Here, the radial axes A2 and A3 are preferably arranged on the same axis. The base 352 has a receiving portion 3521 for accommodating the plunger seat 3512 of the spring plunger 351 and a connecting portion for connection with the first member 31. The two bases 352 are connected to each other by, for example, a screw 353.

[0070] The following is based on Figure 2 and Figure 3 The connection between the base 352 and the first component 31 is described in detail. Figure 3 A perspective view of the base 352 is shown, wherein the connecting portion includes axial stop surfaces 3522, 3523, and 3524, circumferential stop surfaces 3525 and 3526, and radial stop surfaces 3527 and 3528 formed on the base 352. These stop surfaces respectively mate with the axial stop mating surfaces 3102, 3103, and 3104, circumferential stop mating surfaces 3105 and 3106, and radial stop mating surfaces 3107 and 3108 of the mating connecting portion 310 of the first member 31 (see [reference]). Figure 2 This is to prevent relative axial, circumferential and radial movement between the base 352 and the first component 31.

[0071] In other embodiments, the number of axial stop surfaces, circumferential stop surfaces, and radial stop surfaces formed on the base 352 are one, two, or more, respectively, and a corresponding number of axial stop mating surfaces, circumferential stop mating surfaces, and radial stop mating surfaces are formed on the first member 31. Optionally, the axial stop mating surfaces, circumferential stop mating surfaces, and / or radial stop mating surfaces may be formed on other members fixedly connected to the first member 31. Alternatively, the axial stop surfaces, circumferential stop surfaces, and radial stop surfaces may be formed from a single inclined surface or curved surface, such as a spherical surface.

[0072] exist Figure 2In this configuration, the second feedback member 36 is disposed behind the external thread 323 of the second member 32 and integrally constructed with the second member 32. Alternatively, the second feedback member 36 may be separately constructed from and connected to the second member 32. Here, the second feedback member 36 includes a substantially uniform cylindrical outer surface 325 and four grooves 324 (two of which are not shown) uniformly distributed in the circumferential direction and extending in the axial direction A1 on the outer surface 325. Alternatively, the second feedback member 36 may also have a different number of grooves or be constructed as a substantially uniform cylindrical outer surface 325 and ribs on the outer surface 325.

[0073] When the first component 31 moves relative to the second component 32, particularly when they rotate relative to each other, the ball 3511 of the spring plunger 351 on the base 352, which is fixedly connected to the first component 31, moves along a fixed path on the outer surface 325 of the second feedback component 36, specifically along a helix corresponding to the helixes of the external thread 323 and the internal thread 313. Thus, the ball 3511 passes through and interacts with each groove 324 or rib at a constant period, resulting in sudden protrusion or retraction. This sudden protrusion and retraction provides the operator with a clear vibration as tactile feedback and sound as auditory feedback. The magnitude of the vibration and sound can be adjusted by changing the depth of the groove 324 or the height of the rib, as well as the spring constant of the spring plunger 351. The presence of two or more first feedback components 35 can multiply the tactile and / or auditory feedback. The opposing arrangement of the first feedback components 35 can also apply a substantially symmetrical radial force to the second feedback component 36, thereby improving the centering of the second feedback component 36.

[0074] As mentioned at the beginning, the amount of relative movement between the first component 31 and the second component 32 is proportional to the amount of medication inhaled in the injection tube 21. Therefore, this feedback occurs periodically each time, meaning that the amount of medication changes by an equal amount. This means that the change in medication corresponding to each feedback can be adjusted by changing the shape of the helix of the external thread 323 and the internal thread 313, as well as the number of grooves 324 or ribs of the second feedback component 36. The change in medication corresponding to each feedback cycle (also known as the resolution of the second auxiliary device) can be 0.005 ml, 0.01 ml, 0.02 ml, 0.05 ml, or 0.1 ml. In this embodiment, the resolution of the second auxiliary device is one-quarter of the resolution of the first auxiliary device, i.e., 0.025 ml.

[0075] In this embodiment, one of the four grooves of the second feedback member 36 is aligned with the dose markers 326a and 326b. This allows the operator to be precisely alerted that the amount of medication inhaled in the syringe 21 has reached the displayed value in the first opening 316, based on the tactile and / or auditory feedback that occurs simultaneously during the inhalation step, thereby significantly increasing the accuracy of dosage control.

[0076] Furthermore, the first feedback member 35 and the second feedback member 36 can also be implemented in other ways. In another embodiment, the second feedback member 36 can be configured in a rotary needle-free injector as a substantially uniform cylindrical outer surface with protrusions or recesses uniformly arranged on that outer surface along helical lines corresponding to the helical lines of the external thread 323 and the internal thread 313. The elastic member in the first feedback member 35, in particular the spring plunger, can effectively interact with these protrusions or recesses to provide tactile feedback and / or auditory feedback, respectively.

[0077] In a more easily manufactured and lower-cost embodiment, the first feedback member 35 may be configured as a radial protrusion on the inner surface of the first member 31, and the second feedback member 36 may be configured as a plurality of radial protrusions uniformly arranged along the aforementioned spiral line on the outer surface of the second member 32. A radial protrusion of the first member 31 contacts the plurality of radial protrusions of the second member 32 respectively to provide tactile feedback to the operator, in particular to make the operator feel a sudden increase in rotational torque.

[0078] Figure 4 A longitudinal cross-sectional view of a second embodiment of the needleless injector according to the present invention is shown, wherein the needleless injector includes an injection head 2 located at the front end and a needleless injector body 3 located at the rear end.

[0079] The injection head 2 includes an injection tube 21 and a piston rod 22 disposed within the injection tube 21. The injection tube 21 has a chamber with an opening at its rear end, and an injection micro-hole 211 is formed at its front end, communicating between the chamber and the outside. The front end of the piston rod 22 is inserted into the chamber of the injection tube 21, and the rear end of the piston rod 22 has a needle-like portion 23, and a passage 222 is formed in the piston rod 22, which extends from the needle-like portion 23 all the way to the chamber of the injection tube 21.

[0080] The needle-free injector body 3 includes a first component 31, a second component 32, and a plunger 33. The first component 31 is constructed as a closed cylindrical shape at its rear end and has a first circumferential sidewall with an internal thread 313 on its inner side. The second component 32 is at least partially disposed inside the first component 31 and is constructed as a generally cylindrical shape, connecting to the injection head 2 at its front end. The second component 32 has a second circumferential sidewall with an external thread 323 on its outer side. The internal thread 313 engages with the external thread 323, allowing helical motion between the first component 31 and the second component 32. That is, the first component 31 can be translated relative to the second component 32 by rotating the first component 31 relative to the second component 32.

[0081] The push rod 33 is arranged inside the second member 32 and is constructed in the shape of a rod. The push rod 33 is indirectly connected to the piston rod 22 at its front end. The push rod 33 is provided with a flange 333 at its rear end. The flange 333 can be blocked by the limiting member 334, so that the push rod 33 is fixed to the first member 31 in the axial direction A1 via the flange 333, the limiting member 334 and the intermediate member 335.

[0082] The medicine bottle 1 is placed inside the second component 32, between the push rod 33 and the injection head 2. The medicine liquid in the medicine bottle 1 is connected to the chamber of the injection tube 21 through the passage 222 of the needle insertion part 23 and the piston rod 22. During drug intake, Figure 4 In the state shown, by rotating the first component 31 of the needleless injector body 3 relative to the second component 32, the push rod 33 drives the piston rod 22 to move backward, thereby creating a vacuum in the injection tube 21 and thus drawing liquid medicine from the vial 1.

[0083] In order to provide feedback to the operator on the amount of medication inhaled in the injection tube 21 during the inhalation process, the needleless injector body 3 also includes a first auxiliary device. The following is in conjunction with... Figures 5 to 8 The specific structure of the first auxiliary device in the second embodiment will be described in further detail.

[0084] Figure 5 It shows Figure 4 The diagram shows a partial exploded view of the needleless injector body 3, in which the first component 31 of the needleless injector body 3 is translated rearward along the axial direction A1, thereby making the second component 32 visible.

[0085] The needleless injector body 3 includes a first auxiliary device for providing visual feedback, the first auxiliary device including dose marks 326a and 326b disposed on the outer surface of the second member 32, a first opening 316 disposed in the receiving seat 317 of the first member 31, and a visual enhancement element 37 disposed in the receiving seat 317 and aligned with the first opening 316.

[0086] Unlike the first embodiment, dosage marks 326a and 326b are arranged equidistantly along a helix (shown as a dashed line) corresponding to the helix of the external thread 323 and / or the internal thread 313 on the outer surface of the second component, forming four columns of marks arranged axially. Only two columns are shown in the figure due to perspective; the other two columns are obscured. The dosage marks 326a, presented in numerical form, increase in equal increments along the helix extending from front to back. For example, in the current second embodiment, dosage marks 326a include the numbers 4, 5, 6, 7, 8, ... up to 30, which represent the amount of medication inhaled in the syringe as 0.04 ml, 0.05 ml, 0.06 ml, ... up to 0.30 ml, respectively. Therefore, the resolution of the first auxiliary device is 0.01 ml. Specifically, the numbers 4, 8, 12, ... up to 28 are arranged equidistantly along the axial direction in the first column; the numbers 5, 9, 13, ... up to 29 are arranged equidistantly along the axial direction in the second column; the numbers 6, 10, 14, ... up to 30 are arranged equidistantly along the axial direction in the third column; and the numbers 7, 11, 15, ... up to 27 are arranged equidistantly along the axial direction in the fourth column. The four columns of numbers are evenly distributed circumferentially. The interval between adjacent numbers in the same column is equal to the pitch of the external thread 323 and the internal thread 313.

[0087] The following is combined Figure 6 and Figure 8 This section introduces the visual enhancement element 37 and its mounting method.

[0088] Figure 6 A perspective view of the first component 31 is shown. The first component 31 has a recess 312 on the outer side of its first circumferential sidewall, the recess 312 having a generally flat base 312a. A receiving seat 317 is arranged at the front end of the base 312a, the receiving seat 317 having a first opening 316 at its center. The recess 312 of the first component 31 is closed by a first cover 38a.

[0089] Figure 8 A perspective view of a first cover 38a is shown. The first cover 38a has a body 381, at least one connecting portion 382 disposed on the body 381 for connection with a first member 31, an opening 384 disposed at the front end of the body 381, and an annular wall 385 extending inward from the edge of the opening 384. Here, the connecting portion 382 is configured as a snap-fit ​​portion, which is fixedly connected to the first member 31 by snap-fit ​​connection. The connecting portion 382 may also be configured as a threaded portion or a welded portion, and fixedly connected to the first member 31 by threaded connection or welded connection.

[0090] Back Figure 5The visual enhancement element 37 includes a lens portion for optically magnifying dose marks 326a and 326b and a fixing portion for fixing it in a receiving seat 317 of the first member 31. In this embodiment, the fixing portion is configured as an annular flange 371. During installation, the visual enhancement element 37 is placed into the receiving seat 317 of the first member 31, and then a first cover 38a is placed on top of the visual enhancement element 37, such that the opening 384 of the first cover 38a is aligned with the first opening 316 of the first member 31, and the annular wall 385 of the first cover 38a presses against the annular flange 371 of the visual enhancement element 37, thereby fixing the visual enhancement element 37 to the first member 31. The structure after installation can be... Figure 4 It can be clearly seen in the middle.

[0091] Furthermore, the needle-free injector body 3 may also include a second auxiliary device for providing tactile and / or auditory feedback. This second auxiliary device includes a first feedback member 35 and a second feedback member 36, wherein the first feedback member 35 is disposed on and moves together with the first member 31, and the second feedback member 36 is disposed on and moves together with the second member 32. When the first member 31 and the second member 32 move relative to each other, the first feedback member 35 and the second feedback member 36 interact to provide tactile and / or auditory feedback to the operator.

[0092] The first feedback member 35 includes two opposing elastic members, each preferably having a spring plunger 351 and a base 352. The spring plunger 351 has a substantially the same structure as the spring plunger in the first embodiment. The base 352 has a receiving portion 3521 for accommodating a plunger seat 3512 for accommodating the spring plunger 351 and a flange for connecting with the first member 31. The external thread 323 of the second member 32 has a side end face 3232 facing the circumferential direction at its front end. When the second member 32 rotates relative to the first member 31 and translates forward, the side end face 3232 of the external thread 323 eventually abuts against the abutment surface 3520 of the base 352 of the first feedback member 35 (i.e., the elastic member), thereby preventing further rotation of the second member 32 relative to the first member 31. The abutment surface 3520 abutting against the side end face 3232 of the external thread 323 faces the circumferential direction and is opposite in orientation to the side end face 3232 of the external thread 323. The contact surface 3520 can be set on the base 352 of either of the two elastic members, which can be achieved by reasonably designing the thread shape of the external thread 323 and the position of the elastic member.

[0093] The following is based on Figures 5 to 8 The connection between the base 352 and the first component 31 is described in detail, wherein... Figure 7 A perspective view of the base 352 is shown.

[0094] exist Figure 6 In the first component 31, a second opening 314 is also provided on the base 312a of the recess 312. The second opening 314 includes an insertion side 314a and a mounting side 314b. The second opening 314 has a narrowed edge 315 on the mounting side 314b. The second opening 314 has an axial stop mating surface 3142 and circumferential stop mating surfaces 3144 and 3145 on the mounting side 314b.

[0095] exist Figure 7 In this design, the base 352 includes a body and flanges extending from the body. The flanges are configured as two flanges extending laterally from the body. A receiving portion 3521 extending radially in the direction A2, as well as axial stop surfaces 3522, 3523 and circumferential stop surfaces 3524 and 3525, are formed on the body. Radial stop surfaces 3527 and 3528 are formed on the two flanges, respectively. The base 352 can be inserted into the second opening 314 from the insertion side 314a and slide to the mounting side 314b of the second opening 314, such that the flange of the base 352 is located below the edge 315 of the mounting side 314b of the second opening 314. The axial stop surface 3522 of the base 352 mates with the axial stop mating surface 3142 of the second opening 314 of the first member 31, so that the base 352 can be axially mounted on the first member 31. The circumferential stop surfaces 3524 and 3525 of the base 352 mate with the circumferential stop mating surfaces 3144 and 3145 of the second opening 314 of the first member 31 to prevent the base 352 from moving relative to the first member 31 in the circumferential direction. The radial stop surfaces 3527 and 3528 of the base 352 mate with the inner side surface of the edge 315 of the second opening 314 (as radial stop mating surfaces) to prevent the base 352 from moving outward relative to the first member 31.

[0096] exist Figure 8 In the first cover 38a, there is also at least one protrusion 383 extending inward from the body 381 for insertion into the insertion side 314a of the second opening 314 of the first member 31. The protrusion 383 has at least one end face 3831, which acts as an axial stop mating surface to engage with the axial stop surface 3523 of the base 352 to prevent the base 352 from returning from the mounting side 314b into the insertion side 314a.

[0097] The elastic member on the opposite side is connected to the first member 31 in a similar manner. The only difference is that the second cover 38b is constructed to be smaller, and this second cover 38b will be described in more detail below.

[0098] return Figure 5The diagram shows a second feedback member 36 disposed at the front end of the external thread 323 of the second member 32 and integrally constructed with the second member 32. Furthermore, the second feedback member 36 is constructed in a similar manner to the first embodiment and interacts with the first feedback member 35 to provide tactile and auditory feedback, which will not be described further here. Various variations of the first feedback member 35 and the second feedback member 36 in the first embodiment can also be applied here.

[0099] Furthermore, in this embodiment, each of the four grooves serving as the second feedback member 36 is aligned with a corresponding column of the four columns of the dosage markers. This allows for precise indication to the operator that the amount of medication inhaled in the syringe 21 has reached the displayed value in the first opening 316, based on the tactile and / or auditory feedback that occurs simultaneously during the inhalation step, thereby significantly increasing the accuracy of dosage control. Simultaneously, in this embodiment, the visual feedback provided by each dosage marker is accompanied by synchronized tactile and / or auditory feedback, ensuring that the resolution of the second auxiliary device is consistent with that of the first auxiliary device, both being 0.01 ml.

[0100] Figure 9 A longitudinal cross-sectional view of a third embodiment of the needleless injector according to the present invention is shown.

[0101] The main difference from the second embodiment is that the first feedback member 35 of the second auxiliary device in the third embodiment has only one elastic member. A stop member 39 is arranged on the first member 31 opposite to the elastic member, and the radial dimension of the stop member 39 is smaller than the radial dimension of the elastic member. Therefore, from... Figure 9 From the longitudinal cross-sectional view, the side where the stop 39 of the first component 31 is located can be relative to... Figure 4 The corresponding side of the longitudinal cross-section is constructed to be flatter, making it easier for the operator to grip. At the same time, the stop 39 can provide radial support force to the second member 32, thereby providing the second member 32 with centering equivalent to that of the first and second embodiments.

[0102] Furthermore, similar to the second embodiment, the external thread 323 of the second member 32 may also have a side end face facing the circumferential direction at its front end. When the second member 32 rotates relative to the first member 31 and translates forward, the side end face of the external thread 323 eventually abuts against the contact surface 3520 of the base 352 of the first feedback member 35 (i.e., the elastic member) (see...). Figure 7 ) abuts, or abuts against the stop 39 at the abutment surface 390 (see Figure 10The abutment surface 3520 of the base 352 or the abutment surface 390 of the stop 39 faces the circumferential direction and is opposite to the orientation of the side end face 3232 of the external thread 323. In this embodiment, the side end face 3232 of the external thread 323 preferably abuts against the abutment surface 390 of the stop 39, which can be achieved by reasonably designing the thread shape of the external thread 323 and the position of the stop 39.

[0103] exist Figure 10 A perspective view of the first component 31 is shown. The first component 31 has another recess 316 on the outer side of the first circumferential sidewall, opposite to the recess 312 for mounting the elastic member. This recess 316 has a generally flat base 316a. A third opening 317 is provided on the base 316a, including an insertion side 317a and a mounting side 317b. The third opening 317 has a narrowed edge 318 on the mounting side 317b. An axial stop mating surface 3172 and circumferential stop mating surfaces 3174 and 3175 are provided on the mounting side 317b of the third opening 317.

[0104] Figure 11A perspective view of the stop 39 is shown. The stop 39 includes a body and at least one pair of flanges extending from the body. Here, the flanges are configured as two pairs of radially spaced flanges extending from the body to both sides. An inner surface 391 is formed on the stop 39, which is configured to complement the outer surface 325 of the second member 32, or the outer surface 325 of the second feedback member 36. When the second member 32 is radially biased, the inner surface 391 of the stop 39 can provide radial support for it. Axial stop surfaces 392, 393 and circumferential stop surfaces 394, 395 are formed on the body of the stop 39. Radial stop surfaces 396, 397, 398 and 399 are formed on the flanges of the stop 39. The stop member 39 can be inserted into the third opening 317 from the insertion side 317a and slide to the mounting side 317b of the third opening 317, such that the edge 318 of the third opening 317 is engaged between the two pairs of flanges of the stop member 39. The axial stop surface 3522 of the stop member 39 mates with the axial stop mating surface 3172 of the third opening 317 of the first member 31, so that the stop member 39 can be installed in the first member 31 in the axial direction. The circumferential stop surfaces 394 and 395 of the stop member 39 mate with the circumferential stop mating surfaces 3174 and 3175 of the third opening 317 of the first member 31, so as to prevent the stop member 39 from moving relative to the first member 31 in the circumferential direction. The radial stop surfaces 396 and 398 of the stop member 39 engage with the inner side of the edge 318 of the third opening 317 (as radial stop mating surfaces), and the radial stop surfaces 397 and 399 of the stop member 39 engage with the outer side of the edge 318 of the third opening 317 (as radial stop mating surfaces) to prevent the stop member 39 from moving outward and inward relative to the first member 31.

[0105] Figure 12 A perspective view of a second cover 38b for closing another recess 316 of the first member 31 is shown. This second cover 38b is structurally similar to the second cover 38b in the second embodiment. The second cover 38b has a body 385, at least one connecting portion 386 disposed on the body 385 for connecting with the first member 31, and at least one protrusion 387 extending inward from the body 385 for inserting into the insertion side 317a of the third opening 317 of the first member 31. Here, the connecting portion 386 is configured as a snap-fit ​​portion, which is fixedly connected to the first member 31 by snap-fit ​​connection. The connecting portion 386 may also be configured as a threaded portion or a welded portion, and fixedly connected to the first member 31 by threaded connection or welded connection. The protrusion 387 has at least one end face 3871, which serves as an axial stop mating surface and engages with the axial stop surface 393 of the stop member 39 to prevent the stop member 39 from returning from the mounting side 317b of the third opening 317 into the insertion side 317a.

[0106] Alternatively, the flange of the base 352 of the first feedback member 35 can be constructed similarly to the flange of the stop member 39. Various variations of the first feedback member 35 and the second feedback member 36 in the first embodiment can also be applied here.

[0107] In a translational aspiration needleless injector, the first component moves only in the axial direction relative to the second component. Therefore, the dose markers can be arranged in a single column along the axial direction, and the second feedback component can be constructed as a groove or rib extending circumferentially, or as protrusions or pits arranged equidistantly along the axial direction.

[0108] In other types of needle-free injectors, the dose marker and the second feedback component can be arranged on the second component according to the movement between the first and second components.

[0109] Furthermore, the needle-free injector described herein can be used not only for injecting liquid medications but also for injecting other substances, such as saline solution and glucose. Similarly, the dosage markings can be used to indicate the amount of other substances aspirated into the syringe. Therefore, using the needle-free injector described in this invention to inject other substances also falls within the scope of this invention.

[0110] The above description of various embodiments of this utility model is provided for the purpose of description to a person skilled in the art. It is not intended to exclude or limit the utility model to a single disclosed embodiment. As stated above, a person skilled in the art will understand that various alternatives and variations of this utility model exist. Therefore, although some alternative embodiments have been specifically described, a person 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.

Claims

1. A needleless injector body, the needleless injector body comprising a first component and a second component capable of moving relative to the first component, characterized in that, The needleless injector body also includes a first auxiliary device for providing visual feedback, the first auxiliary device comprising: At least one dose marker is disposed on the outer surface of the second member; A first opening, the first opening being disposed on the first member; and A visual enhancement element, which is fixed to the first member and positioned to align with the first opening. During the relative movement between the first component and the second component, the at least one dose marker is sequentially aligned with the first opening and optically magnified by the visual enhancement element.

2. The needleless injector body according to claim 1, characterized in that, The first component has an internal thread, and the second component has an external thread that mates with the internal thread, wherein the first component and the second component move relative to each other along a helical path through the engagement of the internal thread and the external thread.

3. The needleless injector body according to claim 1 or 2, characterized in that, The first auxiliary device includes multiple dose markers, which are arranged at equal intervals along the axial direction.

4. The needleless injector body according to claim 2, characterized in that, The first auxiliary device includes a plurality of dose markers, which are arranged at equal intervals along a spiral line corresponding to the spiral line.

5. The needleless injector body according to claim 4, characterized in that, The plurality of dose markers are arranged in multiple columns extending in the axial direction, and the multiple columns are evenly distributed in the circumferential direction of the second member.

6. The needleless injector body according to claim 4, characterized in that, The multiple doses are marked with numbers, which increase in equal increments along the spiral.

7. The needleless injector body according to claim 1, characterized in that, The first auxiliary device includes a plurality of dose markers, wherein the axial distance between adjacent dose markers is set such that the resolution of the first auxiliary device is 0.005 ml, 0.01 ml, 0.02 ml, 0.05 ml or 0.1 ml.

8. The needleless injector body according to claim 1, characterized in that, The at least one dose mark is formed on the second component by a molding process or a surface treatment process.

9. The needleless injector body according to claim 8, characterized in that, The surface treatment process is etching, engraving, or spraying.

10. The needleless injector body according to claim 1, characterized in that, The visual enhancement element includes a lens portion and a fixing portion. The visual enhancement element optically magnifies the at least one dose mark through the lens portion and is fixed to a receiving seat on the outer surface of the first component through the fixing portion.

11. The needleless injector body according to claim 10, characterized in that, The lens section is formed by a single convex lens or is composed of multiple lenses.

12. The needleless injector body according to claim 10, characterized in that, The fixing part is constructed as an annular flange, and the needleless injector body also includes a first cap for covering the first opening. The annular wall of the first cap presses against the annular flange to fix the visual enhancement element in the receiving seat of the first component.

13. The needleless injector body according to claim 2, characterized in that, The needleless injector body further includes a second auxiliary device for providing tactile feedback and / or auditory feedback. The second auxiliary device includes a first feedback component and a second feedback component. The first feedback component is disposed on the first component and moves together with the first component. The second feedback component is disposed on the second component and moves together with the second component. When the first component and the second component move relative to each other, the first feedback component interacts with the second feedback component to provide tactile feedback and / or auditory feedback.

14. The needleless injector body according to claim 13, characterized in that, The first feedback member and the second feedback member are configured to interact with each other in one or more ways, such as collision, contact, friction and elastic deformation, and thus generate one or more tactile feedbacks, such as speed change, friction change, torque change and vibration.

15. The needleless injector body according to claim 13, characterized in that, At least one dose marker of the first auxiliary device and a second feedback component of the second auxiliary device are arranged on the second component such that the visual feedback of the first auxiliary device is at least partially synchronized with the tactile feedback and / or auditory feedback of the second auxiliary device.

16. The needleless injector body according to claim 15, characterized in that, At least one dose marker of the first auxiliary device and a second feedback component of the second auxiliary device are arranged on the second component such that each visual feedback in the visual feedback of the first auxiliary device is synchronized with a corresponding tactile feedback and / or auditory feedback in the tactile feedback and / or auditory feedback of the second auxiliary device.

17. The needleless injector body according to claim 15, characterized in that, The second feedback member includes a substantially uniform cylindrical outer surface and one or more ribs or grooves extending axially on the outer surface.

18. The needleless injector body according to claim 17, characterized in that, One of the one or more ribs or grooves is on the same straight line as the at least one dose marker.

19. The needleless injector body according to claim 17, characterized in that, The second feedback component includes multiple ribs or grooves, which are evenly distributed in the circumferential direction of the second component.

20. The needleless injector body according to claim 19, characterized in that, The first auxiliary device includes a plurality of dose markers, which are equidistantly arranged along a spiral line corresponding to the spiral and arranged in a plurality of columns extending in the axial direction. Each of the plurality of ribs or grooves is arranged on the same straight line as a corresponding column of the plurality of columns.

21. The needleless injector body according to claim 13, characterized in that, The first auxiliary device and the second auxiliary device are configured such that the resolution of the first auxiliary device is the same as or an integer multiple of the resolution of the second auxiliary device.

22. The needleless injector body according to claim 13, characterized in that, The second feedback component is integrally constructed with the second component.

23. The needleless injector body according to claim 13, characterized in that, The first feedback component is constructed as an elastic component.

24. The needleless injector body according to claim 23, characterized in that, The elastic member includes a spring plunger and a base, the base having a receiving portion for accommodating the spring plunger, and the spring plunger being disposed on the first member via the base.

25. The needleless injector body according to claim 24, characterized in that, The base of the elastic member has at least one axial stop surface, at least one circumferential stop surface and at least one radial stop surface, and the first member has at least one axial stop mating surface that mates with the at least one axial stop surface, at least one circumferential stop mating surface that mates with the at least one circumferential stop surface and at least one radial stop mating surface that mates with the at least one radial stop surface.

26. The needleless injector body according to claim 24, characterized in that, The first component is provided with a second opening, the second opening including an insertion side and a mounting side, the second opening having a narrowed edge on the mounting side, and the base of the elastic component having at least one flange, wherein the elastic component can be inserted into the second opening from the insertion side of the second opening and slide to the mounting side of the second opening, such that the narrowed edge of the second opening and at least one flange of the base cooperate to prevent the elastic component from moving away from the second component.

27. The needleless injector body according to claim 26, characterized in that, The base of the elastic member is provided with at least a pair of radially spaced flanges, wherein the elastic member can be inserted into the second opening from the insertion side of the second opening and slide to the mounting side of the second opening, such that the narrowed edge of the second opening is engaged between the at least a pair of radially spaced flanges of the base to prevent the elastic member from moving toward the second member and away from the second member.

28. The needleless injector body according to claim 26 or 27, characterized in that, The needleless injector body also includes a first cap for covering the second opening. The first cap is provided with a protrusion. When the first cap covers the second opening, the protrusion of the first cap extends into the insertion side of the second opening and prevents the elastic member installed in the mounting side of the second opening from sliding out of the mounting side.

29. The needleless injector body according to claim 23, characterized in that, The first feedback component includes two elastic components arranged opposite each other.

30. The needleless injector body according to claim 23, characterized in that, The first feedback component includes only one elastic member, and the needleless injector body has a stop member arranged on the first component opposite to the elastic member, the radial dimension of the stop member being smaller than the radial dimension of the elastic member.

31. The needleless injector body according to claim 30, characterized in that, The first component has a third opening, which includes an insertion side and a mounting side. The third opening has a narrowed edge on the mounting side, and the stop has at least one pair of radially spaced flanges. The stop is capable of being inserted into the third opening from the insertion side and sliding to the mounting side of the third opening, such that the edge of the third opening is engaged between the at least one pair of flanges of the stop to prevent the stop from moving toward or away from the second component.

32. The needleless injector body according to claim 31, characterized in that, The needleless injector body also includes a second cap for covering the third opening. The second cap has a protrusion, wherein when the second cap covers the third opening, the protrusion of the second cap extends into the insertion side of the third opening and prevents a stop installed on the mounting side of the third opening from sliding out of the mounting side.

33. The needleless injector body according to claim 30, characterized in that, The external thread has a side end face facing the circumferential direction at its front end. When the second component rotates relative to the first component and translates forward, the side end face of the external thread eventually abuts against the abutting surface of the first feedback component or the stop component that faces opposite to the side end face, thereby preventing the second component from rotating further relative to the first component.

34. A needle-free injector, characterized in that, The needleless injector includes an injection head and a needleless injector body according to any one of claims 1-33, the injection head having an injection tube and a piston rod disposed in the injection tube, the piston rod being connectable to a first component or a second component of the needleless injector body such that relative movement between the first component and the second component causes the piston rod to move relative to the injection tube to draw in the injection tube for injection.

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