quantitative injection device

Abstract

A quantitative injection device includes: an outer sleeve component, a push rod component, and a locking component. The push rod component has a continuously distributed convex-concave structure on its surface along the axial direction, adapted to engage with the outer sleeve component and move along the axial direction of the outer sleeve component. During the movement of the push rod component, the convex-concave structure is impeded by the locking component. The distance between adjacent convex-concave structures corresponds to the dosage of the injected substance. The locking component is disposed at the opening of the first end where the push rod component engages with the outer sleeve component, adapted to cooperate with the convex-concave structure on the push rod component during its axial movement along the outer sleeve component, thereby impeding the movement of the push rod component. Using this device can improve the accuracy of the injected substance dosage.

Description

Technical Field

[0001] The embodiments in this specification relate to the field of medical device technology, and in particular to a quantitative injection device. Background Technology

[0002] Injection devices, such as syringes, are primarily used for injecting and extracting various medications, as well as mixing different drugs. When used in conjunction with a needle or catheter, medications can be injected into the body for the treatment of diseases.

[0003] Conventional medical syringes have brought great convenience to clinical applications and are widely used in various medical procedures. However, in specific scenarios, such as the administration of chemotherapy drugs, cosmetic drugs, anesthetics, and embolic agents, which require highly precise quantitative injection, the injection volume is often manually controlled by referring to the scale markings on the syringe surface. Due to visual errors, this often fails to achieve the desired effect. Furthermore, the significant differences in the slippage properties of different syringes further increase the difficulty of injection.

[0004] In summary, how to improve the accuracy of injection dosage of drugs and other injectable substances is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, embodiments of this specification provide a quantitative injection device that can improve the accuracy of the injection volume of the injected substance.

[0006] The quantitative injection device provided in the embodiments of this specification includes: an outer casing, a push rod, and a cartridge component, wherein:

[0007] The push rod component has a surface with a continuous convex-concave structure along the axial direction, which is suitable for engaging with the outer sleeve component and moving along the axial direction of the outer sleeve component. The convex-concave structure is blocked by the clip component during the movement of the push rod component. The distance between adjacent convex-concave structures corresponds to the dosage of the injected substance.

[0008] The clip-on component is located at the opening of the first end where the push rod component and the outer sleeve component are sleeved, and is adapted to cooperate with the concave and convex structures on the push rod component to impede the movement of the push rod component during the axial movement of the push rod component along the outer sleeve component.

[0009] Optionally, the clip-on component includes a fixing body, an opening structure, and a snap-fit ​​body, wherein:

[0010] The fixing body is adapted to be fixedly connected to the outer casing component;

[0011] The opening structure is provided on the fixed body and is suitable for the push rod component to pass through;

[0012] The snap-fit ​​body is disposed on the fixing part and faces the opening structure, and is adapted to snap onto the concave and convex structure on the surface of the push rod component to impede the movement of the push rod component.

[0013] Optionally, the fixing body has a U-shaped structure, wherein the opening of the U-shaped structure is adapted to the opening at the first end of the outer sleeve component.

[0014] Optionally, the snap-fit ​​body includes a first snap-fit ​​portion and a second snap-fit ​​portion, which are disposed opposite to each other at the opening structure, and there is a gap between the first snap-fit ​​portion and the second snap-fit ​​portion, the size of which is adapted to the concave and convex structure of the push rod component surface.

[0015] Optionally, both the first latching part and the second latching part are spring clips.

[0016] Optionally, the first end of the outer jacket component has a rolled edge perpendicular to its axial direction.

[0017] Optionally, the fixing body includes:

[0018] plate body

[0019] Multiple buckles are distributed on the bottom surface of the plate and are adapted to engage with the rolled edge of the first end of the outer casing.

[0020] Optionally, the latching body includes: a first receiving portion, a second receiving portion, a third latching portion, a fourth latching portion, a first elastic member, and a second elastic member, wherein:

[0021] The first accommodating part and the second accommodating part are located on the bottom surface of the plate body and are disposed opposite to each other at both ends of the opening structure. The first accommodating part is provided with a first guide rail, and the second accommodating part is provided with a second guide rail.

[0022] The third and fourth latching parts are disposed opposite to each other on both sides of the opening structure. The third latching part can move along the first guide rail, and the fourth latching part can move along the second guide rail. There is a gap between the third and fourth latching parts, and the size of the gap is adapted to the concave and convex structure of the surface of the push rod component.

[0023] The first elastic member is disposed in the first accommodating portion, with its first end in elastic contact with the plate body and its second end fixedly connected to the third snap-fit ​​portion, and is adapted to cooperate with the first guide rail to drive the third snap-fit ​​portion to move along the first guide rail;

[0024] The second elastic member is disposed in the second accommodating part, with its first end in elastic contact with the plate body and its second end fixedly connected to the fourth snap-fit ​​member, and is adapted to cooperate with the second guide rail to drive the fourth snap-fit ​​member to move along the second guide rail.

[0025] Optionally, the continuously distributed concave-convex structure is a serrated concave-convex structure that is parallel to the axial direction of the push rod component and has a serrated cross-sectional shape, with the distance between each adjacent serrated concave-convex structure being equal.

[0026] Optionally, the continuously distributed concave-convex structure is a spiral concave-convex structure distributed along the surface of the push rod component, and the pitch of each adjacent spiral concave-convex structure is equal.

[0027] The quantitative injection device provided in this specification includes an outer casing, a push rod, and a cartridge component. The push rod is movable along the axial direction of the outer casing. During the movement of the push rod, the surface of the push rod has a continuously distributed concave-convex structure along the axial direction. Therefore, the concave-convex structure is blocked by the cartridge component. With the cooperation of the concave-convex structure and the cartridge component, the movement of the push rod can be blocked. Since the distance between adjacent concave-convex structures corresponds to the dosage of the injected substance, the dosage of the injected substance can be accurately controlled by blocking the movement of the push rod, without being affected by the injector's personal experience and visual errors, thus improving the accuracy of the injected substance dosage.

[0028] Furthermore, the clip-on component includes a fixing body, an opening structure, and a snap-fit ​​body. The fixing body fixes the clip-on component at the opening of the first end where the push rod component and the outer sleeve component are sleeved. When the push rod component moves along the axial direction of the outer sleeve, the uneven structure distributed on its surface can be snapped into the snap-fit ​​body through the opening structure to block the movement of the push rod component, thereby controlling the dosage of the injected substance and improving the accuracy of the injection volume.

[0029] Furthermore, the fixing body has a U-shaped structure, wherein the opening of the U-shaped structure is adapted to the opening at the first end of the outer sleeve component. By designing the U-shaped opening to adapt to the opening at the first end of the outer sleeve component, the fixing body and the outer sleeve component can be fixedly connected, preventing the clip component from falling off during use.

[0030] Furthermore, since both the first and second locking parts are springs and have elasticity, the push rod component can reciprocate axially in the outer sleeve component through the first and second locking parts, thereby accurately controlling the dosage during the injection and extraction processes of the injectable material and improving the injection volume accuracy.

[0031] Furthermore, the fixing body includes a plate and multiple buckles. The multiple buckles can engage with the rolled edge at the first end of the outer casing. By engaging the buckles with the rolled edge at the first end of the outer casing, on the one hand, the fixing body and the outer casing can be fixedly connected, preventing the buckle from falling off during use; on the other hand, since the buckles and rolled edge are pluggable connections, different types of buckle components can be quickly replaced, adapting to different application scenarios, having better versatility, and reducing replacement time.

[0032] Furthermore, the continuously distributed concave and convex structures on the push rod component are parallel to the axial direction of the push rod component and have a serrated cross-sectional shape. Since the distance between each adjacent serrated concave and convex structure is equal, and the distance between each adjacent serrated concave and convex structure has the same corresponding relationship with the dosage of the injected substance, the push rod component with the above-mentioned serrated concave and convex structure can improve the accuracy of the injection volume of the injected substance.

[0033] Furthermore, the continuously distributed concave-convex structure on the push rod component is a spiral concave-convex structure distributed along the surface of the push rod component. Since the pitch of each adjacent spiral concave-convex structure is equal, and the distance between each adjacent spiral concave-convex structure has the same corresponding relationship with the dose of the injected substance, the push rod component with the spiral concave-convex structure described above can improve the accuracy of the injection volume of the injected substance. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this specification, the drawings used in the description of the embodiments of this specification or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a syringe.

[0036] Figure 2 This is a schematic diagram of the structure of a quantitative injection device in an embodiment of this specification.

[0037] Figure 3 This is a schematic diagram of the structure of a card-type component in an embodiment of this specification.

[0038] Figure 4 This is a schematic diagram of another card-type component in the embodiments of this specification.

[0039] Figure 5 This is a schematic diagram of the structure of a push rod component in one of the embodiments of this specification.

[0040] Figure 6This is a schematic diagram of another push rod component in the embodiments of this specification.

[0041] Figure 7 This is a schematic diagram of the combined structure of a push rod component and a card component in one of the embodiments of this specification.

[0042] Figure 8 This is a schematic diagram of another combination structure of push rod component and card component in the embodiments of this specification.

[0043] Figure 9 This is a schematic diagram of another combination structure of push rod component and card component in the embodiments of this specification. Detailed Implementation

[0044] Reference Figure 1 The diagram shows the structure of a syringe 10, which may include an outer casing 11, a piston 12, and a plunger 13.

[0045] The outer jacket 11 has a hollow structure and its surface has scale markings 112 (e.g., scale markings 1 to 5, in ml). The first end of the outer jacket 11 has a rolled edge 113, and the second end has a cone 111 that can be connected to an injection needle or catheter.

[0046] The piston 12 is disposed at the first end of the push rod 13. When the push rod 13 is advanced into the hollow structure inside the outer jacket 11, the piston 12 and the outer jacket 11 can form a sealed space to accommodate the medicine.

[0047] When injecting or extracting a drug, the operator refers to the scale markings 112 on the surface of the outer casing 11 and manipulates the push rod 13 to move the push rod 13 along the axial direction of the outer casing 11. Under the action of the piston 12, the quantitative injection or quantitative extraction of the drug is completed.

[0048] However, as is known from the background art, due to visual errors, the dosage of drugs often fails to meet requirements during injection or extraction. Furthermore, the varying slip properties of different syringes make it difficult to control the injection volume, resulting in low injection accuracy.

[0049] To address the aforementioned problems, this specification provides a quantitative injection device comprising an outer casing, a push rod, and a clip component. The push rod is axially movable along the outer casing. During its movement, the surface of the push rod has a continuously distributed convex-concave structure along its axial direction. This convex-concave structure is impeded by the clip component. The cooperation of the convex-concave structure and the clip component effectively impedes the movement of the push rod. Since the distance between adjacent convex-concave structures corresponds to the dosage of the injected substance, the dosage can be precisely controlled by impeding the movement of the push rod, without being affected by the injector's personal experience or visual errors, thus improving the accuracy of the injected amount.

[0050] To enable those skilled in the art to better understand and implement the embodiments of this specification, the following describes in detail the concepts, schemes, principles, and advantages of the embodiments of this specification in conjunction with the accompanying drawings and specific application examples.

[0051] Reference Figure 2 The schematic diagram shown in this specification illustrates the structure of a quantitative injection device in one of the embodiments of this specification. In some embodiments of this specification, the quantitative injection device 20 may include: an outer casing 21, a push rod 22, and a cartridge 23, wherein:

[0052] The push rod component 22 has a surface with a continuous convex-concave structure (e.g., convex-concave structure 221 in the figure) distributed along the axial direction, which is suitable for engaging with the outer sleeve component 21 and moving along the axial direction of the outer sleeve component 21. The convex-concave structure is blocked by the clip component 23 during the movement of the push rod component 22. The distance between adjacent convex-concave structures corresponds to the dose of the injected substance.

[0053] The clip-on component 23 is disposed at the opening of the first end where the push rod component 22 is sleeved with the outer sleeve component 21, and is adapted to cooperate with the concave and convex structures on the push rod component 22 to block the movement of the push rod component 22 during the axial movement of the push rod component 22 along the outer sleeve component 21.

[0054] When the push rod component 22 moves along the axial direction of the outer sleeve 21, the concave and convex structure continuously distributed along the axial direction on its surface will be blocked by the locking component 23. Under the combined action of the concave and convex structure 221 and the locking component 23, the movement of the push rod component 22 can be blocked.

[0055] During the axial movement of the push rod component 22 along the outer sleeve 21, since the distance between adjacent concave and convex structures on its surface corresponds to the dosage of the injected substance, the dosage of the injected substance can be precisely controlled by resisting the movement of the push rod component 22 through the cooperation of the concave and convex structures and the clip component 23, without being affected by the injector's personal experience and visual errors, thus improving the accuracy of the injected substance dosage.

[0056] In the embodiments described in this specification, the quantitative injection device may further include a piston component ( Figure 2 (Not shown), disposed at one end of the push rod component, adapted to form a sealed space with the outer sleeve component to accommodate the injected material when the push rod component moves along the axial direction of the outer sleeve component.

[0057] In a specific implementation, a sealing ring can be provided at the connection between the piston component and the push rod component. The sealing ring can prevent the injected material from flowing out from the gap between the piston component and the outer sleeve component when the push rod component pushes the piston component to move.

[0058] To enable those skilled in the art to better understand and implement the embodiments of this specification, the following, in conjunction with the accompanying drawings, provides some specific examples of the specific implementation methods of each specific component of the quantitative injection device in the embodiments of this specification.

[0059] In the embodiments described in this specification, the card-type component may include a fixing body, an opening structure, and a snap-fit ​​body, wherein:

[0060] The fixing body is adapted to be fixedly connected to the outer casing component;

[0061] The opening structure is provided on the fixed body and is suitable for the push rod component to pass through;

[0062] The snap-fit ​​body is disposed on the fixing part and faces the opening structure, and is adapted to snap onto the concave and convex structure on the surface of the push rod component to impede the movement of the push rod component.

[0063] Using the above-mentioned clip-on component, the clip-on component can be fixedly installed at the opening of the first end where the push rod component and the outer sleeve component are connected by its fixing body. When the push rod component moves along the axial direction of the outer sleeve, the concave and convex structure distributed on its surface can be engaged with the clip-on body through the opening structure to block the movement of the push rod component, thereby controlling the dosage of the injected substance and improving the accuracy of the injection volume.

[0064] In practice, the clip-on component can be directly and fixedly connected to the outer sleeve, and cooperate with the concave and convex structures on the push rod component to impede the movement of the push rod component.

[0065] Reference Figure 3The schematic diagram shown in this specification illustrates the structure of a card-type component in an embodiment. The card-type structure 30 may include a fixing body 31, an opening structure 32, and a snap-fit ​​body 33, as shown below. Figure 3 As shown, where:

[0066] The fixing body 31 has a U-shaped structure, wherein the opening of the U-shaped structure is connected to the first end of the outer sleeve component ( Figure 3 The opening (not shown in the image) is adapted to the target opening;

[0067] The latching body 33 includes a first latching portion 331 and a second latching portion 332, which are disposed opposite to each other at the opening structure 32, and there is a gap between the first latching portion 331 and the second latching portion 332. The size of the gap is adapted to the concave and convex structure of the surface of the push rod component, such as... Figure 7 and Figure 8 As shown.

[0068] In practice, by designing the U-shaped opening to match the opening at the first end of the outer casing, the fixing body 31 can be fixedly connected to the outer casing, thus preventing the clip-on component from falling off during use.

[0069] The fixing body 31 can be fixedly connected to the outer casing by adhesive bonding.

[0070] In practical applications, in order to accurately control the dosage of the injected material during the injection and extraction processes and improve the accuracy of the injected amount, when the push rod component moves back and forth along the axial direction of the outer sleeve component, the first locking part 331 and the second locking part 332 can both be locked onto the concave and convex structures on the surface of the push rod component. Therefore, both the first locking part 331 and the second locking part 332 need to be elastic.

[0071] When the push rod component is stationary, the first engaging portion 331 and the second engaging portion 332 do not undergo elastic deformation and are engaged in the recess of the concave-convex structure of the push rod component. When the push rod component moves along the axial direction of the outer sleeve component, the first engaging portion 331 and the second engaging portion 332 undergo elastic deformation, allowing the push rod component to move along the axial direction of the outer sleeve component. During the movement of the push rod component, when the first engaging portion 331 and the second engaging portion 332 contact the recess of the concave-convex structure, the first engaging portion 331 and the second engaging portion 332 return to their original state and engage in the recess of the concave-convex structure adjacent to the previous concave-convex structure. When the movement distance of the push rod component reaches a preset distance and stops, the first engaging portion 331 and the second engaging portion 332 engage in the recess of the concave-convex structure at the preset distance to prevent further movement of the push rod component.

[0072] As a specific example, both the first latching part 331 and the second latching part 332 can be spring clips.

[0073] Furthermore, to reduce resistance during the movement of the push rod component and to adapt to the concave and convex structure of the push rod component, in the embodiments of this specification, such as Figure 3 As shown, both the first snap-fit ​​portion 331 and the second snap-fit ​​portion 332 have beveled surfaces facing the bottom of the opening structure.

[0074] In specific implementation, such as Figure 2 As shown, the first end of the outer sleeve component 21 may also have a rolled edge 211 perpendicular to its axis, and the rolled edge 211 may be snapped into the clip component 23 to realize the connection between the clip component 23 and the outer sleeve component 21.

[0075] In the embodiments described in this specification, when the first end of the outer sleeve component has a rolled edge perpendicular to its axial direction, continue referring to... Figure 3 The fixing body 31 also includes a first slot 311 and a second slot 312, which are disposed opposite to each other on both sides of the U-shaped structure and can be engaged with the rolled edge to realize the connection between the fixing body 31 and the outer sleeve component.

[0076] By engaging the first slot 311 and the second slot 321 with the rolled edge at the first end of the outer casing, on the one hand, the fixing body 31 and the outer casing can be fixedly connected, preventing the clip-on component from falling off during use; on the other hand, since the first slot 311, the second slot 321 and the rolled edge are pluggable connections, different types of clip-on components can be quickly replaced, adapting to different application scenarios, having better versatility, and reducing replacement time.

[0077] In a specific implementation, when the first end of the outer sleeve component has a rolled edge perpendicular to its axial direction, the corresponding snap-fit ​​component may include a buckle. The snap-fit ​​component can be fixedly connected to the rolled edge through the buckle and cooperate with the concave and convex structures on the push rod component to block the movement of the push rod component.

[0078] Reference Figure 4 The schematic diagram shown in this specification illustrates another type of clip-on component in an embodiment. The clip-on component 40 may include a fixing body 41, an opening structure 42, and a snap-fit ​​body 43, as shown below. Figure 4 As shown, where:

[0079] The fixing body 41 includes a plate 411 and a plurality of clips (e.g., clips 412 and clips 413), wherein:

[0080] The plurality of buckles are distributed on the bottom surface of the plate 411 and are adapted to engage with the rolled edge of the first end of the outer sleeve component. Figure 4 (Not shown) Snap-fit;

[0081] For example, buckles 412 and 413 are disposed opposite to each other on the bottom surface of the plate 411 and can engage with the rolled edge of the first end of the outer sleeve component.

[0082] In specific implementation, by engaging the buckle with the rolled edge of the first end of the outer cover component, on the one hand, the fixing body 41 and the outer cover component can be fixedly connected, preventing the buckle component from falling off during use; on the other hand, since the buckle and rolled edge are pluggable connections, different types of buckle components can be quickly replaced, which can adapt to different application scenarios, has better versatility, and can reduce replacement time.

[0083] The snap-fit ​​body 43 includes: a first receiving portion 431, a second receiving portion 432, a third snap-fit ​​portion 433, a fourth snap-fit ​​portion 434, a first elastic member 435, and a second elastic member 436, wherein:

[0084] The first accommodating part 431 and the second accommodating part 432 are located on the bottom surface of the plate 411 and are disposed opposite to each other at both ends of the opening structure 42. The first accommodating part 431 is provided with a first guide rail 437 and the second accommodating part 432 is provided with a second guide rail 438.

[0085] The third locking portion 433 and the fourth locking portion 434 are disposed opposite to each other on both sides of the opening structure 42. The third locking portion 433 is movable along the first guide rail 437, and the fourth locking portion 434 is movable along the second guide rail 438. A gap exists between the third locking portion 433 and the fourth locking portion 434, the size of which is adapted to the uneven structure of the push rod component surface. Figure 9 As shown;

[0086] The first elastic member 435 is disposed in the first accommodating portion 431. Its first end is in elastic contact with the plate body 411, and its second end is fixedly connected to the third snap-fit ​​portion 433. It is suitable for cooperating with the first guide rail 4311 to drive the third snap-fit ​​portion 433 to move along the first guide rail 437.

[0087] The second elastic member 436 is disposed in the second accommodating portion 432. Its first end is in elastic contact with the plate body 411, and its second end is fixedly connected to the fourth snap-fit ​​member 434. It is adapted to cooperate with the second guide rail 437 and drive the fourth snap-fit ​​member 434 to move along the second guide rail 438.

[0088] When the push rod component is stationary, the first elastic element 435 and the second elastic element 436 are in a naturally extended state, and the third locking part 433 and the fourth locking part 434 are engaged with the recess of the concave-convex structure of the push rod component. When the push rod component moves along the axial direction of the outer sleeve component, the first elastic element 435 and the second elastic element 436 are compressed, and the third locking part 433 moves along the first guide rail 437 in a first preset direction under the action of the first elastic element 435. At the same time, the fourth locking part 444 moves along the second guide rail 437 in a second preset direction under the action of the second elastic element 436. During the movement of the push rod component, when the third locking part 433 and the fourth locking part... When 434 contacts the recess of the push rod component's concave-convex structure, the first elastic element 435 resets and drives the third locking part 433 to move along the first guide rail 437 in a direction opposite to the first preset direction. At the same time, the second elastic element 436 resets and drives the fourth locking part 444 to move along the second guide rail 437 in a direction opposite to the second preset direction. The third locking part 433 and the fourth locking part 434 engage with the recess of the concave-convex structure adjacent to the previous concave-convex structure. When the push rod component's movement distance reaches the preset distance, the third locking part 433 and the fourth locking part 437 engage with the recess of the concave-convex structure at the preset distance to block further movement of the push rod component.

[0089] In the embodiments described in this specification, in order to reduce the resistance during the movement of the push rod component and to adapt to the concave and convex structure of the push rod component, both the third locking part 433 and the second locking part 434 have beveled surfaces facing the opening structure 42.

[0090] Furthermore, to reduce the contact area between the third locking part 433 and the fourth locking part 434 and the plate 411 during movement, the third locking part 431 has protrusions at both ends that are adapted to the first guide rail 437, and the fourth locking part 434 has protrusions at both ends that are adapted to the second guide rail 438. This reduces the friction between the third locking part 433, the fourth locking part 434 and the plate 411, allowing the movement of the third locking part 433 and the fourth locking part 434 to be achieved with very little thrust, making operation convenient.

[0091] In specific implementation, the first elastic member 435 mainly provides elastic force to the third snap-fit ​​part 433, and the second elastic member 436 mainly provides elastic force to the fourth snap-fit ​​part 434. Since the movement stroke of the third snap-fit ​​part 433 and the fourth snap-fit ​​part 434 is relatively short, sufficient elastic force can be provided by using elastic materials or other elements that can provide elastic force.

[0092] As a specific example, the first elastic element 435 and the second elastic element 436 can be springs or elastic materials such as rubber.

[0093] In practice, the cartridge component and the outer casing component can be designed as a single piece. For example, while manufacturing the outer casing component, the cartridge component can be directly formed on the outer casing component through processes such as injection molding and extrusion.

[0094] It is understood that the structure of the card-type component described above is merely illustrative. In practical applications, the structure of the card-type component in the embodiments of this specification can be modified according to actual needs and application scenarios. For example, for Figure 3 The U-shaped structure in the middle can have a square bottom. This specification does not limit the specific structure of the clip-on component, as long as it can be fixedly connected to the outer sleeve component and can engage with the concave and convex structures of the push rod component during its movement.

[0095] In practice, when the cartridge component on the outer casing is removed, the push rod component can move freely along the axis of the outer casing, realizing the free injection function of a traditional syringe. Therefore, by removing the cartridge component on the outer casing, the switching between quantitative injection and free injection can be achieved, which is convenient for application in different clinical scenarios.

[0096] In specific implementation, the embodiments of this specification also provide a push rod component with a continuously distributed concave-convex structure on its surface that is adapted to the above-mentioned card component. The concave-convex structure works together with the card component to achieve precise control of the injection volume by blocking the movement of the push rod component. The concave-convex structure includes a concave portion and a convex portion, and the snap-fit ​​portion in the card component can snap into the concave portion of the concave-convex structure.

[0097] Reference Figure 5 The schematic diagram shown in this specification illustrates the structure of a push rod component in an embodiment of the present specification. The continuously distributed concave and convex structures on the push rod component 50 are parallel to the axial direction of the push rod component 50 and have a serrated cross-sectional shape (e.g., serrated concave and convex structures 51, 52, and 53). The distance between each adjacent serrated concave and convex structure is equal (e.g., the distance between serrated concave and convex structures 51 and 52 is the same as the distance between serrated concave and convex structures 52 and 53).

[0098] In practice, since the distance between adjacent serrated structures corresponds to the dosage of the injected substance, the distance between adjacent serrated structures can be flexibly adjusted according to actual needs, while ensuring that the distance between each adjacent serrated structure is equal, so that the distance between each adjacent serrated structure corresponds to the dosage of the injected substance.

[0099] In the embodiments of this specification, the dosage of the injected substance corresponding to the distance between each adjacent serrated uneven structure can be set according to the capacity of the quantitative injection device. When the quantitative injection device has scale markings on its surface, the dosage of the injected substance corresponding to the distance between each adjacent serrated uneven structure is 1 / 20 to 2 times the smallest scale marking, preferably 1 / 10 to 1 times. When the quantitative injection device does not have scale markings on its surface, the dosage of the injected substance corresponding to the distance between each adjacent serrated uneven structure can be 0.01 mL, 0.05 mL, 0.1 mL, 0.2 mL, 0.5 mL, or 1 mL. The specific correspondence can be selected by adjusting the distance between each adjacent serrated uneven structure according to the capacity of the corresponding injection device.

[0100] Continue to refer to Figure 5 ,Depend on Figure 5 It can be seen that the axial portion of the push rod component 50 is not fully distributed with serrated concave and convex structures, and there is still some space left to facilitate the snap-fit ​​component to snap onto the serrated concave and convex structures at both ends of the push rod component 50.

[0101] Reference Figure 6 The schematic diagram shown in this specification illustrates another push rod component in an embodiment of the present specification. In this embodiment, the continuously distributed concave and convex structures on the push rod component 60 are spiral concave and convex structures (e.g., spiral concave and convex structures 61, 62, and 63) distributed along the surface of the push rod component 60. The pitch of each spiral concave and convex structure is equal (e.g., the distance between spiral concave and convex structures 61 and 62 is the same as the distance between spiral concave and convex structures 62 and 63).

[0102] In practice, since the distance between adjacent concave and convex structures corresponds to the dosage of the injected substance, the distance between adjacent spiral concave and convex structures can be flexibly adjusted according to actual needs, while ensuring that the distance between each adjacent spiral concave and convex structure is equal, so that the distance between each adjacent serrated concave and convex structure has the same corresponding relationship with the dosage of the injected substance.

[0103] In the embodiments of this specification, the dosage of the injected substance corresponding to the distance between each adjacent spiral-shaped concave-convex structure can be set according to the capacity of the quantitative injection device. When the quantitative injection device has scale markings on its surface, the dosage of the injected substance corresponding to the distance between each adjacent spiral-shaped concave-convex structure is 1 / 20 to 2 times the smallest scale marking, preferably 1 / 10 to 1 times. When the quantitative injection device does not have scale markings on its surface, the dosage of the injected substance corresponding to the distance between each adjacent spiral-shaped concave-convex structure can be 0.01 mL, 0.05 mL, 0.1 mL, 0.2 mL, 0.5 mL, or 1 mL. The specific correspondence can be selected by adjusting the distance between each adjacent spiral-shaped concave-convex structure according to the capacity of the corresponding injection device.

[0104] Continue to refer to Figure 6 ,Depend on Figure 6 It can be seen that the surface of the push rod component 60 is not completely covered with a spiral concave-convex structure, and there is still some space left to facilitate the clamping of the clip component to the spiral concave-convex structure at both ends of the push rod component 60.

[0105] It is understood that the above description of the concave-convex structure is merely illustrative. In practical applications, those skilled in the art can adaptively select and / or modify the concave-convex structure of the push rod component in the embodiments of this specification according to actual needs and application scenarios. For example, the number and size of the concave-convex structure can be changed to adapt to quantitative injection devices with different capacities; for another example, the distance between adjacent concave-convex structures can be adjusted to change the correspondence between the distance between adjacent concave-convex structures and the dosage of the injected substance; and for yet another example, the shape of the distance between the concave-convex structures can be changed. For instance, the concave-convex structure may also include trapezoidal concave-convex structures, square concave-convex structures, and elliptical concave-convex structures with varying curvatures. Based on this, many different extension schemes can be derived, and the embodiments of this specification do not limit these extension schemes.

[0106] In specific implementations, the push rod component and the cartridge component in the above embodiments can be combined to obtain quantitative injection devices with different forms.

[0107] Reference Figure 7 The schematic diagram shown in this specification illustrates a combination structure of a push rod component and a card component in an embodiment of this specification, wherein the push rod component 71 has a sawtooth-shaped concave-convex structure.

[0108] When the serrated concave-convex structure of the push rod component 71 is perpendicular to the locking component 72, since the locking portions 721 and 722 in the locking component 72 are spring pieces, when a certain pushing force is applied to the push rod component 71, the locking portions 721 and 722 deform, and the push rod component 71 can move upward or downward along the locking portions 721 and 722. The serrated concave-convex structure distributed along its axial direction moves with the push rod component 71. When the locking portions 721 and 722 contact the concave portion of the serrated concave-convex structure, the locking portion 721... 1 and 722 recover their deformation and engage with the recess of the serrated concave-convex structure adjacent to the previous serrated concave-convex structure. Since the distance between adjacent serrated concave-convex structures corresponds to the dosage of the injected substance, when the number of recesses of the serrated concave-convex structure engaged with the engaging parts 721 and 722 reaches the preset number, the pushing force is stopped. The engaging parts 721 and 722 engage with the recesses of the serrated concave-convex structure of the push rod component 71, blocking the movement of the push rod component 71 and completing the injection or extraction process of the injected substance.

[0109] Furthermore, since the width of the concave-convex structure side of the push rod component 71 is greater than the width of the non-concave-convex structure side, when the serrated concave-convex structure of the push rod component 71 is parallel to the clip component 72, the width of the non-concave-convex layer of the push rod component 71 is smaller than the gap between the clip portions 721 and 722. The push rod component 71 can move freely without being obstructed by the clip portions 721 and 722 in the clip component 72, thus realizing the function of the push rod in the existing injection device.

[0110] Reference Figure 8 The diagram shown in this specification illustrates another combination structure of the push rod component and the card component in an embodiment of this specification, wherein... Figure 8 The push rod component 81 in the middle and Figure 7 The difference is that, Figure 8 The push rod component 81 has a spiral concave-convex structure, and movement is achieved by rotating the push rod component 81.

[0111] When the spiral-shaped concave-convex structure of the push rod component 81 contacts the locking component 82, since the locking portions 821 and 822 in the locking component 82 are spring pieces, when the push rod component 81 is rotated, the locking portions 821 and 822 deform, and the push rod component 81 can move upward or downward along the locking portions 821 and 822. The spiral-shaped concave-convex structure distributed along its axial direction moves with the push rod component 81. When the locking portions 821 and 822 contact the concave portion of the spiral-shaped concave-convex structure, the locking portions 821 and 822 return to their original position. The push rod component undergoes a reshaping process and engages with the recess of the spiral concave-convex structure adjacent to the previous spiral concave-convex structure. Since the distance between adjacent serrated concave-convex structures corresponds to the dosage of the injected substance, when the number of recesses of the spiral concave-convex structure engaged with the engaging parts 821 and 822 reaches a preset number, the rotation of the push rod component stops. The engaging parts 821 and 822 engage with the recesses of the spiral concave-convex structure of the push rod component 81, blocking the rotational movement of the push rod component 81 and completing the injection or extraction process of the injected substance.

[0112] Furthermore, since the push rod component 81 has a spiral-shaped concave-convex structure with the same width on each side, it is always obstructed by the locking parts 821 and 822 when the push rod component 81 rotates.

[0113] Reference Figure 9 The diagram shown is a composite structure of another push rod component and a card component in an embodiment of this specification, wherein... Figure 9 Card component 92 and Figure 7 The difference between the clip component 71 and the clip component 92 is that the clip parts 921 and 922 in the clip component 92 are unidirectional movement structures. Therefore, the push rod component 91 can only move downward along the clip parts 921 and 922.

[0114] When the serrated uneven structure of the push rod component 91 is perpendicular to the locking component 92, a thrust along its axial direction is applied to the push rod component 91. The elastic elements 923 and 924 are compressed, and the elastic element 923 drives the locking portion 921 to move in a first preset direction, while the elastic element 924 drives the locking portion 922 to move in a second preset direction. The push rod component 91 can move downwards along the locking portions 921 and 922. The serrated uneven structure distributed along its axial direction follows the movement of the push rod component 91. When the push rod component 91 has moved a certain distance, the elastic elements 923 and 924 reset, and the elastic element 923 drives the locking portion 921 to move in the opposite direction to the first preset direction. The direction of movement is driven by the elastic element 924 to move the locking part 922 in the opposite direction to the second preset direction. The locking parts 921 and 922 can lock into the recess of the serrated concave-convex structure adjacent to the previous serrated concave-convex structure. Since the distance between adjacent serrated concave-convex structures corresponds to the dosage of the injected substance, when the number of recesses of the serrated concave-convex structure locked with the locking parts 921 and 922 reaches the preset number, the pushing force is stopped, the elastic elements 923 and 924 are reset, and the locking parts 921 and 922 lock into the recess of the serrated concave-convex structure of the push rod component 91, blocking the downward movement of the push rod component 91, thus completing the injection or extraction process of the injected substance.

[0115] Furthermore, since the width of the concave-convex structure side of the push rod component 91 is greater than the width of the non-concave-convex structure side, when the serrated concave-convex structure of the push rod component 91 is parallel to the clip component 92, the width of the non-concave-convex layer of the push rod component 91 is smaller than the gap between the clips 921 and 922. The push rod component 91 can move freely without being obstructed by the clips 921 and 922, thus realizing the function of the push rod in the existing injection device.

[0116] It is understood that the embodiments described above provide multiple implementation schemes, and these implementation schemes can be combined and cross-referenced with each other without conflict, thereby extending to multiple possible implementation schemes. These can all be considered as the implementation schemes disclosed and made public in this application.

[0117] It should be noted that the term "an embodiment" or "embodiment" as used in this specification refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this specification. Furthermore, in the description of this specification, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with terms such as "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, terms such as "first" and "second" are used to distinguish similar objects and are not necessarily used to describe a specific order or indicate importance. It is understood that such terms can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein.

[0118] While the embodiments disclosed in this specification are as described above, they are not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments described herein. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A quantitative injection device, characterized in that, include: Outer casing, push rod assembly, and cartridge assembly, among which: The push rod component has a surface with a continuous convex-concave structure along the axial direction, which is suitable for engaging with the outer sleeve component and moving along the axial direction of the outer sleeve component. The convex-concave structure is blocked by the clip component during the movement of the push rod component. The distance between adjacent convex-concave structures corresponds to the dosage of the injected substance. The clip-on component is disposed at the opening of the first end where the push rod component and the outer sleeve component are sleeved, and has a gap for the push rod component to pass through. The size of the gap is adapted to the width of the concave and convex structure side of the push rod component. The clip-on component is adapted to cooperate with the concave and convex structure on the push rod component to block the movement of the push rod component during the axial movement of the push rod component along the outer sleeve component. The surface of the push rod component also has a non-convex / concave structure. The width of the non-convex / concave structure side of the push rod component is smaller than the size of the gap and smaller than the width of the concave / convex structure side, so that one of the concave / convex structure side and the non-convex / concave structure side can be selected to face the sidewall of the gap. The continuously distributed concave / convex structure is parallel to the axial direction of the push rod component and has a sawtooth-shaped concave / convex structure in cross-section. When the non-convex / concave structure side is selected to face the sidewall of the gap, the push rod component is not hindered by the locking component and can move freely.

2. The quantitative injection device according to claim 1, characterized in that, The clip-on component includes a fixing body, an opening structure, and a snap-fit ​​body, wherein: The fixing body is adapted to be fixedly connected to the outer casing component; The opening structure is provided on the fixed body and is suitable for the push rod component to pass through; The snap-fit ​​body is disposed on the fixing part and faces the opening structure, and is adapted to snap onto the concave and convex structure on the surface of the push rod component to impede the movement of the push rod component.

3. The quantitative injection device according to claim 2, characterized in that, The fixing body has a U-shaped structure, wherein the opening of the U-shaped structure is adapted to the opening at the first end of the outer sleeve component.

4. The quantitative injection device according to claim 3, characterized in that, The snap-fit ​​body includes a first snap-fit ​​portion and a second snap-fit ​​portion, which are disposed opposite to each other at the opening structure, and the gap is located between the first snap-fit ​​portion and the second snap-fit ​​portion.

5. The quantitative injection device according to claim 4, characterized in that, Both the first and second locking parts are spring clips.

6. The quantitative injection device according to claim 2, characterized in that, The first end of the outer casing component has a rolled edge perpendicular to its axial direction.

7. The quantitative injection device according to claim 6, characterized in that, The fixing body includes: plate body; Multiple buckles are distributed on the bottom surface of the plate and are adapted to engage with the rolled edge of the first end of the outer casing.

8. The quantitative injection device according to claim 7, characterized in that, The snap-fit ​​body includes: a first receiving portion, a second receiving portion, a third snap-fit ​​portion, a fourth snap-fit ​​portion, a first elastic member, and a second elastic member, wherein: The first accommodating part and the second accommodating part are located on the bottom surface of the plate body and are disposed opposite to each other at both ends of the opening structure. The first accommodating part is provided with a first guide rail, and the second accommodating part is provided with a second guide rail. The third and fourth latching parts are disposed opposite to each other on both sides of the opening structure, and the third latching part can move along the first guide rail, and the fourth latching part can move along the second guide rail, wherein the gap is located between the third and fourth latching parts; The first elastic member is disposed in the first accommodating portion, with its first end in elastic contact with the plate body and its second end fixedly connected to the third snap-fit ​​portion, and is adapted to cooperate with the first guide rail to drive the third snap-fit ​​portion to move along the first guide rail; The second elastic member is disposed in the second accommodating part, with its first end in elastic contact with the plate body and its second end fixedly connected to the fourth snap-fit ​​member, and is adapted to cooperate with the second guide rail to drive the fourth snap-fit ​​member to move along the second guide rail.

9. The quantitative injection device according to claim 2, characterized in that, The distance between each adjacent serrated concave-convex structure is equal.

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