Pusher rod assembly for a needle-free injector and needle-free injector

Abstract

The utility model relates to the field of medical apparatus and instruments, concretely relates to a push stroke rod subassembly for needleless injector and needleless injector. The push stroke rod subassembly for needleless injector includes guide plate and push stroke rod, be equipped with through -hole on the guide plate, push stroke rod is worn in the through -hole, be equipped with a plurality of mounting slots on the guide plate along the circumference of the through -hole, at least one mounting slot's parameter is different with the parameter of remaining mounting slot, push stroke rod includes push stroke rod body and a plurality of protrusions along the periphery of push stroke rod body, a plurality of protrusions and a plurality of mounting slots are set up one by one. When installing push stroke rod, the protrusion mounting surface on push stroke rod is oriented through mounting slot and protrusion, and assembly is convenient, and the mistake proofing of assembly process link in production is realized.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a push rod assembly for a needleless injector and a needleless injector. Background Technology

[0002] Needle-free injection, also known as jet injection, is a medical device that uses the instantaneous high pressure generated by a power source to propel the drug (liquid or lyophilized powder) in the syringe through the nozzle to form a high-speed, high-pressure jet, thereby allowing the drug to penetrate the outer layer of the skin and release its effects into the subcutaneous, intradermal, and other tissue layers.

[0003] The push rod assembly of existing needleless injectors lacks error-proofing design during production, making it easy for the push rod and guide plate to be installed incorrectly, affecting its use. Utility Model Content

[0004] This invention provides a push rod assembly for a needleless injector and a needleless injector, to overcome the problem of the push rod and guide plate being easily installed incorrectly.

[0005] To address the aforementioned technical problems, this utility model provides a push rod assembly for a needle-free injector. The push rod assembly includes a guide plate and a push rod. The guide plate has a through hole, and the push rod passes through the through hole. The guide plate has multiple mounting grooves along the circumference of the through hole, and the parameters of at least one mounting groove are different from the parameters of the other mounting grooves. The push rod includes a push rod body and multiple protrusions arranged along the outer periphery of the push rod body, and the multiple protrusions are configured to cooperate with the multiple mounting grooves one by one.

[0006] Furthermore, the parameters of the mounting slot include at least one of the dimensions, shape, and position of the mounting slot.

[0007] Furthermore, the width of one of the mounting slots is greater than the width of the other mounting slots, and the widths of the other mounting slots are equal.

[0008] Furthermore, the number of mounting slots is 2 to 8.

[0009] Furthermore, the guide plate is provided with multiple positioning holes.

[0010] According to another aspect of the present invention, a needle-free injector is provided, the needle-free injector including a mounting base and a push rod assembly for a needle-free injector according to the present invention, wherein a guide plate in the push rod assembly is fixedly disposed on the mounting base, and a push rod in the push rod assembly is slidably disposed relative to the mounting base.

[0011] Furthermore, the mounting base is provided with at least one transverse weight-reducing groove and / or at least one longitudinal weight-reducing groove.

[0012] Furthermore, a motor mounting boss is provided on one side of the mounting base. The motor mounting boss includes a first plane for connecting with the mounting plane of the motor, and the area of ​​the first plane is smaller than the area of ​​the mounting plane of the motor.

[0013] Furthermore, the needleless injector includes an end face cam, which is disposed on the other side of the mounting base and can rotate relative to the mounting base under the drive of a motor. The end face cam is provided with multiple weight reduction holes.

[0014] Furthermore, the needleless injector includes a push block assembly, which includes a push block and a roller rotatably connected to the push block. The push block is fixedly connected to the top of the push rod, and the roller abuts against the end face cam. The edge of the push block has a rounded structure.

[0015] Since the parameters of at least one of the mounting slots (hereinafter referred to as the first mounting slot) are different from those of the other mounting slots, and the protrusions and mounting slots are set in a one-to-one correspondence, then one of the protrusions (hereinafter referred to as the first protrusion) also has parameters that are different from those of the other protrusions. Therefore, the push rod and the guide plate can only match in one position. When the first mounting slot and the first protrusion are not aligned, the installation cannot be successful; the installation can only be successful when the first mounting slot and the first protrusion are aligned. Therefore, when installing the push rod, it is convenient to orient the mounting surface of the protrusion on the push rod, making assembly convenient and realizing error prevention in the assembly process during production.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the needleless injector according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the push rod assembly for a needleless injector according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the mounting base according to an embodiment of the present utility model.

[0020] In the figure: 1. End face cam, 2. Mounting base, 3. Push block assembly, 3.1. Roller, 3.2. Push block, 4. Guide plate, 4.1. Positioning hole, 4.2. Mounting groove, 5. Positioning pin, 6. Push rod, 6.1. Protrusion, 2.1. Transverse weight reduction groove, 2.2. Longitudinal weight reduction groove, 2.3. Motor mounting boss. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the specific implementation methods and effects of this utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0022] In this specification, for illustrative purposes only, various systems, structures, and devices are schematically depicted in the accompanying drawings, but not all features of the actual systems, structures, and devices are described. For example, well-known functions or structures are not described in detail to avoid unnecessary detail that could obscure this application. It should be understood that in any practical application, many specific implementation decisions need to be made to achieve the specific goals of the developer or user, and to comply with system-related and industry-related limitations, which may vary depending on the specific application. Furthermore, it should be understood that while such implementation decisions are complex and time-consuming, they are routine tasks for those skilled in the art who benefit from this application.

[0023] The terms and phrases used herein should be understood and interpreted in accordance with the understanding of those skilled in the art. The consistent use of terms or phrases herein is not intended to imply a specific definition, i.e., a definition different from the common and conventional meaning understood by those skilled in the art. For terms or phrases intended to have a specific meaning, i.e., a meaning different from that understood by those skilled in the art, such specific definition will be explicitly listed in the specification, giving the specific definition of the term or phrase directly and unambiguously.

[0024] Unless otherwise required by the content, throughout the following description and claims, the word “comprising” and its variations, such as “including”, shall be interpreted in an open-ended, inclusive sense, that is, as “including but not limited to”.

[0025] Throughout this specification, references to terms such as "an embodiment," "one embodiment," "some embodiments," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Therefore, the phrases "in one embodiment" or "in one embodiment" appearing in different places throughout this specification do not necessarily refer to the same embodiment. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] In the description of the embodiments of this application, the terms "first", "second", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0027] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0028] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Figure 1 This is a schematic diagram of the structure of the needleless injector according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the push rod assembly for a needleless injector according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the mounting base according to an embodiment of the present utility model.

[0031] According to one aspect of the present invention, a push rod assembly for a needleless injector is provided, such as... Figures 1-3As shown, the push rod assembly for a needle-free injector includes a guide plate 4 and a push rod 6. The guide plate 4 has a through hole, and the push rod 6 passes through the through hole. The guide plate 4 has multiple mounting grooves 4.2 along the circumference of the through hole, and the parameters of at least one mounting groove 4.2 are different from the parameters of the other mounting grooves 4.2. The push rod 6 includes a push rod body and multiple protrusions 6.1 arranged along the outer circumference of the push rod body, and the multiple protrusions 6.1 are configured to cooperate with the multiple mounting grooves 4.2 one by one. In this embodiment, the push rod 6 can be a plunger-type jet pump push rod 6.

[0032] The phrase "the plurality of protrusions 6.1 are configured to cooperate with the plurality of mounting grooves 4.2" means that the number of protrusions 6.1 is the same as the number of mounting grooves 4.2, and the shape, size, and position of the protrusions 6.1 are adapted to the shape, size, and position of the mounting grooves 4.2.

[0033] Since at least one of the mounting slots 4.2 (hereinafter referred to as the first mounting slot) has different parameters than the other mounting slots, and the protrusions 6.1 are set in a one-to-one correspondence with the mounting slots 4.2, one of the protrusions 6.1 (hereinafter referred to as the first protrusion 6.1) also has different parameters than the other protrusions 6.1. Therefore, the push rod 6 and the guide plate 4 can only match in one orientation. When the first mounting slot 4.2 and the first protrusion 6.1 are not aligned, installation cannot be successful; installation can only be successful when the first mounting slot 4.2 and the first protrusion 6.1 are aligned. Therefore, during the installation of the push rod 6, the mounting surface of the protrusion 6.1 on the push rod 6 is oriented through the mounting slot 4.2 and the protrusion 6.1, which facilitates assembly and prevents errors in the assembly process during production.

[0034] Furthermore, the parameters of the mounting groove 4.2 include at least one of the dimensions, shape, and position of the mounting groove 4.2.

[0035] In one embodiment of this utility model, the parameters of the mounting groove 4.2 include dimensions, including the width of the mounting groove 4.2. The width of the mounting groove 4.2 refers to the dimension along the circumference of the through hole; that is, the width of at least one mounting groove 4.2 is different from the width of the others. The width of the mounting groove 4.2 on the guide plate 4 corresponds to the width of the protrusion 6.1 on the push rod 6. In this embodiment, the width of the protrusion 6.1 refers to the dimension at the point where the width of the protrusion 6.1 matches the width of the mounting groove 4.2; in other words, the width of the protrusion 6.1 refers to the dimension of the protrusion 6.1 along the circumference of the push rod 6. Due to this difference in width, the push rod 6 and the guide plate 4 can only match in one orientation, thus preventing errors.

[0036] In one embodiment of this utility model, the parameters of the mounting groove 4.2 include dimensions, including the length of the mounting groove 4.2. The length of the mounting groove 4.2 refers to its dimension in the radial direction along the through hole; that is, the length of at least one mounting groove 4.2 is different from the lengths of the others. The length of the mounting groove 4.2 on the guide plate 4 corresponds to the length of the protrusion 6.1 on the push rod 6. In this embodiment, the length of the protrusion 6.1 refers to the dimension at the point where the length of the protrusion 6.1 matches the length of the mounting groove 4.2; in other words, the length of the protrusion 6.1 refers to the radial dimension of the protrusion 6.1 along the push rod 6. Due to this difference in length, the push rod 6 and the guide plate 4 can only match in one orientation, thus preventing errors.

[0037] In another embodiment of this utility model, the parameters of the mounting groove 4.2 include shape, that is, the shape of at least one mounting groove 4.2 is different from the shape of the other mounting grooves 4.2. Specifically, one mounting groove 4.2 is square, and the shape of the other mounting grooves 4.2 is semi-circular. Or one mounting groove 4.2 is semi-circular, and the shape of the other mounting grooves 4.2 is triangular. The shape of the mounting groove 4.2 on the guide plate 4 corresponds to the shape of the protrusion 6.1 on the push rod 6. Due to this difference in shape, the push rod 6 and the guide plate 4 can only fit together when the shapes of the mounting groove 4.2 and the protrusion 6.1 are consistent, thus preventing errors.

[0038] In some embodiments of this utility model, the parameters of the mounting groove 4.2 include the position of the mounting groove, which refers to its distribution along the circumference of the through hole. When multiple mounting grooves are all the same size and shape and are evenly distributed along the circumference of the through hole, the error prevention purpose cannot be achieved. In this embodiment, the position of one of the mounting grooves 4.2 is set to be different from the positions of the other mounting grooves 4.2. The different position in this embodiment means that one of the mounting grooves is not set in an evenly distributed position. The position of the mounting groove 4.2 on the guide plate 4 corresponds to the position of the protrusion 6.1 on the push rod 6. Due to this difference in position, the push rod 6 and the guide plate 4 can only match in one direction, thus achieving error prevention.

[0039] In a specific example, there are six mounting slots 4.2, named sequentially along the circumference of the through hole as the first mounting slot, second mounting slot, third mounting slot, fourth mounting slot, fifth mounting slot, and sixth mounting slot. These six mounting slots are not uniformly distributed; for example, the distance between any two adjacent mounting slots is not equal. There are also six corresponding protrusions 6.1, whose positions correspond to the positions of the six mounting slots. In this example, the position of each mounting slot is specific, and each mounting slot can only be successfully installed when its mating protrusion is aligned. This ensures that the push rod 6 and the guide plate 4 can only mate in one orientation, achieving the purpose of preventing errors.

[0040] In another embodiment of this utility model, the parameters of the mounting groove 4.2 include shape and width, that is, at least one mounting groove 4.2 has a different shape and size from the other mounting grooves 4.2. Due to this difference, the push rod 6 and the guide plate 4 can only match in one orientation, thus preventing errors.

[0041] In other embodiments of this utility model, the above-mentioned shape, size, and position can be any combination of two or three, which can also serve the purpose of preventing incorrect assembly. This embodiment will not elaborate further.

[0042] In one embodiment of this utility model, when the number of mounting slots 4.2 is N, only one mounting slot 4.2 may have parameters that are different from the parameters of the other N-1 mounting slots 4.2.

[0043] In one embodiment of this utility model, when the number of mounting slots 4.2 is N, the parameters of two mounting slots 4.2 are different from the width of the other N-2 mounting slots 4.2. The parameters of these two mounting slots 4.2 can be the same or different.

[0044] In one embodiment of this utility model, when the number of mounting slots 4.2 is N, the parameters of three mounting slots 4.2 are different from the width of the remaining N-3 mounting slots 4.2. The parameters of these three mounting slots 4.2 can be the same or different.

[0045] In one embodiment of this utility model, when the number of mounting slots 4.2 is N, the parameters of these N mounting slots 4.2 can be different from each other, or only partially the same.

[0046] In other words, as long as not all the parameters of the mounting slots 4.2 are exactly the same, then the error prevention function can be achieved.

[0047] In one embodiment of this utility model, the width of one of the mounting slots 4.2 is greater than the width of the other mounting slots 4.2, and the widths of the other mounting slots 4.2 are equal. This embodiment simplifies the design and facilitates manufacturing.

[0048] Specifically, the mounting groove 4.2 (or inner spline groove) of the guide plate 4 matches the protrusion 6.1 (or key) on the push rod 6. In one embodiment, there are six mounting grooves 4.2. The width of one key on the push rod 6 is greater than the width of the other five keys, and the width of one inner spline groove on the guide plate 4 is greater than the width of the other five inner spline grooves. The push rod 6 can only match in one position to prevent assembly angle errors.

[0049] In one embodiment of this utility model, only one of the mounting slots 4.2 has a different shape from the other mounting slots 4.2, while the other mounting slots 4.2 have the same shape. This embodiment simplifies the design and facilitates manufacturing.

[0050] Furthermore, the number of mounting slots 4.2 is 2 to 8. In this embodiment, the number of mounting slots 4.2 is relatively large. The more mounting slots 4.2 there are, the more the machining error will be averaged out, and the higher the orientation accuracy of the push rod 6 will be.

[0051] exist Figure 2 In the embodiment shown, there are six mounting slots 4.2, and one of the mounting slots 4.2 can be randomly designated to have a width greater than the widths of the other mounting slots 4.2.

[0052] Furthermore, the guide plate 4 is provided with multiple positioning holes 4.1. The center of the mounting base is provided with a through hole, through which the push rod can pass and slide relative to the mounting base. The mounting base is provided with positioning blind holes. After the positioning holes 4.1 on the guide plate 4 and the positioning blind holes on the mounting base are aligned, positioning is achieved by positioning pins 5 passing through the positioning holes 4.1 and the positioning blind holes, ensuring the coaxiality of the through holes of the guide plate 4 and the through holes of the mounting base. The mounting groove on the guide plate 4 and the protrusion on the push rod cooperate to ensure the installation coaxiality of the center of the through hole of the guide plate and the central axis of the push rod 6, thereby realizing the coaxiality of the through hole of the mounting base, the through hole of the guide plate, and the central axis of the push rod, so that the push rod can move smoothly.

[0053] In some examples, the number of positioning holes 4.1 can be two or three, or other numbers of positioning holes 4.1 can be set as needed. Figure 2 In the embodiment shown, the two positioning pins 5 are arranged at 180° in the circumferential direction, that is, the two positioning pins 5 are arranged opposite each other.

[0054] According to another aspect of the present invention, a needle-free injector is provided, the needle-free injector including a mounting base 2 and a push rod assembly for a needle-free injector according to the present invention, wherein a guide plate 4 in the push rod assembly is fixedly disposed on the mounting base 2, and a push rod 6 in the push rod assembly is slidably disposed relative to the mounting base 2. In use, the push rod 6 performs linear motion relative to the mounting base 2 and the guide plate 4.

[0055] Furthermore, the mounting base 2 is provided with at least one transverse weight-reducing groove and / or at least one longitudinal weight-reducing groove.

[0056] exist Figure 3 In the embodiment shown, the mounting base 2 has multiple transverse weight-reducing slots 2.1 and multiple longitudinal weight-reducing slots 2.2, which can effectively reduce the weight of the mounting base 2 and achieve lightweight design.

[0057] Furthermore, a motor mounting boss 2.3 is provided on one side of the mounting base 2. The motor mounting boss 2.3 includes a first plane for connecting with the mounting plane of the motor, and the area of ​​the first plane is smaller than the area of ​​the mounting plane of the motor. In this embodiment, the boss 2.3 is set to be smaller than the mounting plane of the motor, which further realizes the weight reduction design, saves materials, and reduces costs.

[0058] The area of ​​the first plane of the motor mounting boss 2.3 can be much smaller than the area of ​​the motor mounting platform, as long as the motor can be successfully installed.

[0059] Furthermore, the needle-free injector includes an end face cam 1, which is disposed on the other side of the mounting base 2 and can rotate relative to the mounting base 2 under the drive of a motor. The bottom plate of the end face cam 1 is provided with multiple weight-reducing holes. In this embodiment, the bottom of the end face cam 1 has a hollow structure, which effectively reduces the weight and makes it easier to hold the needle-free injector for use.

[0060] The shape of the weight-reducing hole can be customized according to requirements. Figure 1 In the illustrated embodiment, the weight-reducing holes are oblong in shape. There are multiple weight-reducing holes. The oblong holes are evenly distributed circumferentially along the bottom plate of the end face cam 1 to achieve uniform weight reduction.

[0061] Furthermore, the needle-free injector includes a push block assembly 3, which includes a push block 3.2 and a roller 3.1 rotatably connected to the push block 3.2. The push block 3.2 is fixedly connected to the top of the push rod 6, and the roller 3.1 abuts against the end face cam 1. Specifically, the roller 3.1 can be rotatably mounted on the push block 3.2 via a pin.

[0062] In use, the motor's output shaft passes through the mounting base 2 and is connected to the end face cam 1 via a transmission pin on the motor shaft. The motor's output shaft then drives the end face cam 1 to rotate. When the end face cam 1 rotates, it drives the push block assembly 3 to move up and down. The push block assembly 3 drives the push rod 6 to move linearly.

[0063] The edge of the push block 3.2 is rounded, and the shape of the push block 3.2 can be elephant trunk shaped. In this embodiment, the push block 3.2 is designed with near-uniform stiffness, and weight reduction is achieved by removing excess material through chamfering and rounding.

[0064] This invention facilitates the orientation of the protruding mounting surface 6.1 of the push rod 6 during installation, making assembly convenient and preventing errors in the assembly process during production. It also incorporates multiple weight-reduction design schemes, resulting in a lightweight and easy-to-use design.

[0065] It should be noted that this application may include any feature or combination of features or generalization thereof implied or expressly disclosed herein, and is not limited to any of the foregoing limitations. Any elements, features and / or structural arrangements described herein may be combined in any suitable manner.

[0066] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A push rod assembly for a needleless injector, characterized in that, include: The guide plate has a through hole, and the push rod passes through the through hole. The guide plate has multiple mounting grooves along the circumference of the through hole, and the parameters of at least one mounting groove are different from the parameters of the other mounting grooves. The push rod includes a push rod body and multiple protrusions arranged along the outer circumference of the push rod body, and the multiple protrusions are configured to cooperate with the multiple mounting grooves one by one.

2. The push rod assembly for a needleless injector according to claim 1, characterized in that, The parameters of the mounting slot include at least one of the dimensions, shape, and position of the mounting slot.

3. The push rod assembly for a needleless injector according to claim 1, characterized in that, One of the mounting slots has a width greater than the widths of the other mounting slots, and the widths of the other mounting slots are equal.

4. The push rod assembly for a needleless injector according to claim 1, characterized in that, The number of mounting slots is 2 to 8.

5. The push rod assembly for a needleless injector according to claim 1, characterized in that, The guide plate is provided with multiple positioning holes.

6. A needle-free injector, characterized in that, The device includes a mounting base and a push rod assembly for a needleless injector according to any one of claims 1-5, wherein a guide plate in the push rod assembly is fixedly disposed on the mounting base, and a push rod in the push rod assembly is slidably disposed relative to the mounting base.

7. The needleless injector according to claim 6, characterized in that, The mounting base is provided with at least one transverse weight-reducing groove and / or at least one longitudinal weight-reducing groove.

8. The needleless injector according to claim 6, characterized in that, A motor mounting boss is provided on one side of the mounting base. The motor mounting boss includes a first plane for connecting with the mounting plane of the motor. The area of ​​the first plane is smaller than the area of ​​the mounting plane of the motor.

9. The needleless injector according to claim 8, characterized in that, It includes an end face cam, which is disposed on the other side of the mounting base and can rotate relative to the mounting base under the drive of a motor. The end face cam is provided with multiple weight reduction holes.

10. The needleless injector according to claim 9, characterized in that, The device includes a push block assembly, which includes a push block and a roller rotatably connected to the push block. The push block is fixedly connected to the top of the push rod, and the roller abuts against the end face cam. The edge of the push block has a rounded structure.

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