A metered dose inhaler

Abstract

The application discloses a quantitative injection device, which comprises a shell with a sliding cavity, an adjuster and a push rod; the adjuster slides along the sliding cavity; a plurality of dose positions are arranged in the sliding cavity to position the adjuster in the sliding direction; the push rod comprises a pre-filled syringe push rod which slides along the sliding cavity and a push handle which is fixed with the pre-filled syringe push rod and used to abut against the adjuster. The quantitative injection device can be applied to pre-filled syringes of vaccines, insulin and other substances, and can realize quantitative injection of the aforementioned substances in a plurality of injection amounts. When the quantitative injection device is used, the sliding range of the pre-filled syringe push rod in the sliding cavity is restricted by the adjuster in different dose positions, so that the maximum displacement of the pre-filled syringe push rod to the tail part of the pre-filled syringe is controlled, thereby realizing quantitative injection and adjusting the specific injection amount of the positioning injection. The quantitative injection device has a small number of components and simple assembly relationship, greatly simplifies the product structure and reduces the product cost.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more particularly to a quantitative injection device. Background Technology

[0002] With the development of the medical industry, pre-filled syringes are gradually emerging. Pre-filled syringes allow for the pre-filling of specific quantities of medication into a designated container and connecting it to the syringe, enabling rapid drug administration in clinical settings. This avoids the secondary contamination and inaccurate dosage issues associated with traditional ampoules and vials. The specific container used for pre-filling specific quantities of medication is called a pre-filled syringe.

[0003] Because the amount of medicine pre-filled by pharmaceutical companies cannot meet the specific needs of all users, for example, if some users need to inject less medicine than the amount of medicine in the pre-filled syringe, then the users need to control the injection dosage themselves, which is extremely difficult for non-specialized users; for example, in the beauty industry, multiple injection points need to be injected in quantitative quantities, and the injection volume at a single injection point is obviously difficult to match the amount of medicine in the pre-filled syringe.

[0004] Therefore, various products that can achieve quantitative injection based on pre-filled syringes have emerged on the market. However, these products often have the following problems:

[0005] First, the product has a complex structure and intricate parts and their assembly relationships. When using this product, the failure of any part can lead to risks for the user.

[0006] Second, due to the large number of parts and complex assembly relationships of the products, the products often suffer from high manufacturing costs and complex operation. Summary of the Invention

[0007] The purpose of this application is to provide a quantitative injection device with a simple structure, few parts and simple assembly, which can achieve quantitative injection of pre-filled syringes at various injection volumes.

[0008] To achieve the above objectives, this application provides a quantitative injection device, including a housing with a sliding cavity, an adjuster, and a push rod; the adjuster slides along the sliding cavity; the sliding cavity is provided with a plurality of dose positions for the adjuster to be positioned along the sliding direction; the push rod includes a pre-filled syringe plunger that slides along the sliding cavity and a push handle fixed to the pre-filled syringe plunger for abutting against the adjuster.

[0009] In some embodiments, the device further includes a dosing device and a locking device with a limiting strip; both the regulator and the locking device slide linearly along the sliding cavity; one end of the dosing device is helically engaged with the regulator, and the other end of the dosing device is provided with a plurality of circumferentially distributed limiting grooves; the relative positional relationship between the regulator and all the dosing positions corresponds one-to-one with the relative positional relationship between the limiting strip and all the limiting grooves.

[0010] In some embodiments, the periphery of the dosimeter is provided with a plurality of readings corresponding one-to-one with all the dose positions; the display window of the housing is used to display the reading of the dosimeter at the current dose position.

[0011] In some embodiments, the surface of the lock is provided with a reference marker; the reference marker is flush with one of the limiting slots when the limiting strip engages with any of the limiting slots.

[0012] In some embodiments, the regulator includes a spiral cylinder with threads on its outer periphery and a dose adjustment block fixedly connected to the spiral cylinder; the spiral cylinder is slidably installed in the sliding cavity, and the dose adjustment block is located outside the housing.

[0013] In some embodiments, the locker includes a locking ring slidably mounted in the sliding cavity and a dose locking block fixedly connected to the locking ring; the limiting strip is disposed on the inner ring wall of the locking ring; and the dose locking block is located outside the housing.

[0014] In some embodiments, the outer wall of the housing includes a planar sliding surface I; both the dose adjustment block and the dose locking block have a sliding surface II that slides in contact with the sliding surface I.

[0015] In some embodiments, the housing includes a head and a tail located at both ends of the sliding cavity; the lock, the dosing device, the adjuster, and the push handle are distributed sequentially from the head to the tail; each of the lock, the dosing device, and the adjuster has a central hole through which the push rod of the pre-filled syringe can pass.

[0016] In some embodiments, a housing limiting portion is provided between the housing and the push rod to prevent the pre-filled syringe plunger from being pulled out toward the tail.

[0017] In some embodiments, the housing includes a head and a tail at both ends of the sliding cavity; the head is provided with a locking interface for mounting a pre-filled syringe; the adjuster and the push rod are distributed sequentially from the head to the tail.

[0018] Compared to the aforementioned background technology, the quantitative injection device provided in this application includes a housing with a sliding cavity, an adjuster, and a push rod.

[0019] In this quantitative injection device, the regulator slides along a sliding cavity; the sliding cavity has multiple dose positions that can be positioned by the regulator along the sliding direction; the push rod includes a pre-filled syringe plunger that slides along the sliding cavity and a push handle fixed to the pre-filled syringe plunger. When the push handle abuts against the regulator, the regulator restricts the degree of freedom of movement of the pre-filled syringe plunger toward the regulator, preventing the pre-filled syringe plunger from continuing to slide in the aforementioned direction.

[0020] Since the pre-filled syringe's installation position relative to the housing is fixed, this quantitative injection device can change the maximum sliding range of the pre-filled syringe plunger within the slide cavity by adjusting the regulator at different dose positions. This alters the maximum displacement of the pre-filled syringe plunger relative to the tail of the pre-filled syringe, allowing the pre-filled syringe to achieve quantitative injection with the aforementioned maximum displacement. Simultaneously, changing the dose position of the regulator alters the maximum sliding range of the pre-filled syringe plunger within the slide cavity, thereby changing the specific injection volume.

[0021] It is evident that the quantitative injection device provided in this application has the characteristics of simple structure, few parts and simple matching relationship. Compared with similar products with a large number of parts or even electrical parts, it greatly simplifies the product structure and reduces the product cost. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is an assembly diagram of the quantitative injection device and pre-filled syringe provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the quantitative injection device provided in the embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the housing structure in a first direction provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the housing structure in the second direction provided in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the regulator provided in an embodiment of this application;

[0028] Figure 6This is a schematic diagram of the structure of the dosing device provided in the embodiments of this application;

[0029] Figure 7 This is a schematic diagram of the structure of the lock provided in the embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the push rod provided in an embodiment of this application.

[0031] Among them, 01-prefilled syringe, 1-shell, 11-head, 12-tail, 13-reading window, 14-linear groove, 141-limiting groove, 15-locking interface, 16-fastening concave ring, 2-adjuster, 21-spiral cylinder, 211-external thread, 22-dose adjustment block, 221-adjuster push plate, 3-push rod, 31-prefilled syringe push column, 32-push handle, 321-limiting block, 4-dosing device, 41-limiting groove, 42-fastening convex ring, 43-internal thread, 5-locker, 51-limiting strip, 52-reference marker, 53-dose locking block, 531-locking period push plate, 6-reading. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to Figures 1 to 8 , Figure 1 This is an assembly diagram of the quantitative injection device and pre-filled syringe provided in the embodiments of this application; Figure 2 This is a schematic diagram of the quantitative injection device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the housing structure in a first direction provided in an embodiment of this application; Figure 4 This is a schematic diagram of the housing structure in the second direction provided in the embodiments of this application; Figure 5 This is a schematic diagram of the regulator provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the dosing device provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the lock provided in the embodiment of this application; Figure 8 This is a schematic diagram of the push rod provided in an embodiment of this application.

[0035] This application provides a quantitative injection device, including a housing 1, an adjuster 2, and a push rod 3; the housing 1 is provided with a sliding cavity; the adjuster 2 and the push rod 3 are slidably installed in the sliding cavity of the housing 1, and the extension direction of the cavity is the sliding direction of the adjuster 2 and the push rod 3.

[0036] In this quantitative injection device, the sliding cavity has multiple dose positions that can be positioned by the regulator 2. All dose positions are sequentially distributed along the sliding direction of the regulator 2, and different dose positions can satisfy the positioning of the regulator 2 at different positions in its own sliding direction. Since the pre-filled syringe plunger 31 of the push rod 3 also slides along the sliding cavity, when the push rod 3 slides along the sliding cavity to contact the regulator 2, the push handle 32 of the push rod 3 abuts against the regulator 2. Therefore, the regulator 2, positioned in the sliding cavity by the dose positions, can be used to constrain the maximum sliding range of the pre-filled syringe 01 of the push rod 3. Of course, the regulator 2 at different dose positions can form multiple constraints on the pre-filled syringe 01 of the push rod 3, so that the pre-filled syringe 01 of the push rod 3 has multiple different maximum sliding ranges.

[0037] The aforementioned dose position can be defined by a positioning protrusion located within the sliding cavity. This protrusion allows the regulator 2 to slide along the sliding cavity, but the regulator 2 will experience noticeable resistance when passing over the protrusion, which helps the user distinguish the specific sliding position of the regulator 2 within the sliding cavity. Alternatively, the dose position can be defined by a limiting groove located on the housing. This limiting groove includes a branch I that allows the regulator 2 to slide along the sliding cavity, and multiple branches II that allow the regulator 2 to be locked and positioned at different locations within the sliding cavity. Of course, other structures that enable the regulator 2 to slide and be positioned along the sliding cavity can also serve as the dose position mentioned in this application.

[0038] When using this quantitative injection device, the housing 1 can be assembled and connected to a pre-filled syringe 01 containing medication. After the needle of the pre-filled syringe 01 is inserted into the designated injection site, the pre-filled syringe plunger 31 of the push rod 3 moves towards the end of the pre-filled syringe 01 to squeeze the end of the pre-filled syringe 01, thereby allowing the medication in the pre-filled syringe 01 to flow out from the needle of the pre-filled syringe 01 and flow to the aforementioned injection site.

[0039] Since the installation position of the pre-filled syringe 01 relative to the housing 1 is fixed, the maximum displacement formed by the pre-filled syringe plunger 31 at the end of the pre-filled syringe 01 can be changed by adjusting the maximum sliding range of the plunger 31 within the slide cavity. In other words, the pre-filled syringe plunger 31 can enable the pre-filled syringe 01 to achieve quantitative injection with the aforementioned maximum displacement, and changing the aforementioned maximum displacement means that the pre-filled syringe plunger 31 can enable the pre-filled syringe 01 to achieve quantitative injection with various injection volumes.

[0040] The aforementioned quantitative injection device uses fewer parts, each with a simple function, making it suitable for easy-to-implement and low-cost processing methods such as injection molding. Furthermore, the interaction between different parts is simple, eliminating the need for complex and delicate components such as switches. This greatly simplifies the product structure and reduces product costs while achieving quantitative injection.

[0041] The quantitative injection device provided in this application will be further described below with reference to the accompanying drawings and embodiments.

[0042] In addition to the housing 1, regulator 2, and push rod 3, the quantitative injection device may also include a doser 4 and a locking device 5. Both regulator 2 and locking device 5 slide linearly along the cavity of housing 1. The doser 4 is located inside housing 1 and between regulator 2 and locking device 5. One end of the doser 4 is screwed into regulator 2. When regulator 2 slides linearly along the cavity of housing 1, the doser rotates along a predetermined axis within the cavity and slides along the cavity. The other end of the doser 4 is provided with several circumferentially distributed limiting grooves 41, which are used to achieve a concave-convex fit with the limiting strip 51 of locking device 5.

[0043] In addition, the quantitative injection device can also use the locking concave ring 16 provided in the housing 1 and the locking convex ring 42 provided in the dosing device 4 to prevent the components inside the housing 1 from moving axially.

[0044] In the above structure, the locking device 5 can only slide linearly along the slide cavity and cannot rotate. Therefore, when the limiting strip 51 of the locking device 5 is embedded in the limiting groove 41 of the dosing device 4, the locking device 5 prevents the dosing device 4 from rotating and also prevents the dosing device 4 from sliding along the slide cavity. In short, based on the motion coordination relationship between the regulator 2 and the dosing device 4, this quantitative injection device can use the locking device 5 and its limiting strip 51 to position the dosing device 4, prevent the dosing device 4 from moving within the slide cavity, and thus prevent the regulator 2 from moving within the slide cavity, ultimately achieving positioning of the regulator 2 at different positions within the slide cavity.

[0045] For the non-rotatable locking device 5, the specific limiting groove 41 into which the limiting strip 51 is inserted depends on the rotation angle of the doser 4 within the sliding cavity. Since the rotation angle of the doser 4 within the sliding cavity is related to its sliding displacement, inserting the limiting strip 51 into different limiting grooves 41 means that the doser 4 is locked at different positions within the sliding cavity by the locking device 5, which in turn means that the regulator 2 is locked at a specific position within the sliding cavity. As described above, the regulator 2 of this quantitative injection device can be positioned at different dosage levels. Therefore, in this quantitative injection device, the relative positional relationship between the limiting strip 51 and all the limiting grooves 41 corresponds one-to-one with the relative positional relationship between the regulator 2 and all the dosage levels.

[0046] For the aforementioned quantitative injection device, the pre-filled syringe 01 installed on the product achieves quantitative injection at different injection volumes through four components: a housing 1 with a sliding cavity, an adjuster 2 and a dosing device 4 with a helical engagement, and a locking device 5 with a limiting strip 51. When using this quantitative injection device, in order to lock the position of the adjuster 2 in the sliding cavity by means of the locking device 5, it is necessary to adjust the sliding positions of the locking device 5 and the adjuster 2 in the sliding cavity respectively, so that the specific limiting groove 41 on the surface of the metering device that is helically engaged with the adjuster 2 fits into the limiting strip 51 of the locking device 5, thereby achieving mutual locking and positioning of the adjuster 2, the dosing device 4, and the locking device 5 in the sliding cavity.

[0047] To facilitate user operation, based on the above embodiment, the dosing device 4 is further provided with multiple readings 6 on its periphery. All readings 6 correspond one-to-one with all dose positions, used to calibrate the current injection volume of the quantitative injection device. Simultaneously, the surface of the housing 1 is provided with a display window 13. The display window 13 can be in a perforated form or a transparent sheet; the display window 13 is used to display the reading 6 corresponding to the current dose position of the metering device and the regulator 2 in the quantitative injection device. In short, the user can intuitively obtain the current injection volume of the quantitative injection device through the display window 13.

[0048] Furthermore, a reference marker 52 may be provided on the surface of the locking device 5. When the limiting strip 51 of the locking device 5 is engaged with any one of the limiting slots 41 of the dosing device 4, the reference marker 52 is flush with one of the limiting slots 41 of the dosing device 4. In the foregoing, the two limiting slots 41 may be of the same structure or different structures.

[0049] Since the dosing device 4 cannot be engaged with the locking device 5 at any position within the sliding cavity, the limiting strip 51 of the locking device 5 and the limiting groove 41 of the dosing device 4 can only be aligned and fitted when the regulator 2 is at a certain dosage position. Therefore, with the assistance of the reference marker 52, the user can precisely adjust the position of the regulator 2 in the sliding cavity to ensure that the regulator 2 is at a certain dosage position, thus ensuring that the limiting strip 51 of the locking device 5 can be smoothly fitted into the limiting groove 41 of the dosing device. In short, the purpose of setting the reference marker 52 is to help the user determine whether the regulator 2, which drives the dosing device 4, is exactly at a certain dosage position based on the relative positional relationship between the reference marker 52 and the limiting groove 41.

[0050] Furthermore, the aforementioned reference marker 52 can also be used to indicate the direction of movement of the locking device 5, facilitating the user's use of the quantitative injection device. For example, the reference marker 52 can be set as an arrow icon parallel to the sliding direction of the locking device 5, with the arrow pointing towards the dosing device 4.

[0051] To facilitate user adjustment of the position of the regulator 2 within the sliding cavity, the quantitative injection device provided in this application includes a regulator 2 comprising a spiral cylinder 21 and a dose adjustment block 22 fixedly connected to the spiral cylinder 21. The dose spiral cylinder 21 is located within the sliding cavity, and its outer circumference is provided with an external thread 211 for spiral assembly with the internal thread 43 provided on the dosing device 4. The dose adjustment block 22 is located outside the sliding cavity, allowing the user to push the dose adjustment block 22 to move, thereby enabling the spiral cylinder 21 to move synchronously within the sliding cavity. Specifically, the internal thread 43 can be configured as a double-ended internal thread.

[0052] Similarly, in order to facilitate the user's adjustment of the position of the locking device 5 in the sliding cavity, the quantitative injection device provided in this application includes a locking ring and a dose locking block 53 fixedly connected to the locking ring; the locking ring is located in the sliding cavity, and the limiting strip 51 can be set on the inner ring surface or the outer ring surface of the locking ring; the dose locking block 53 is located outside the sliding cavity, which facilitates the user to push the dose locking block 53 to move, thereby realizing the synchronous movement of the locking ring in the sliding cavity.

[0053] For some quantitative injection devices, the dose adjustment block 22 and dose locking block 53 not only simplify the user's movement control of the regulator 2 and the locker 5, but also assist the screw cylinder 21 and the locking ring in achieving linear sliding along the slide cavity. For example, to accommodate the movement of the meter, the slide cavity is designed as a cylindrical cavity. Correspondingly, the screw cylinder 21 and the locking ring within the slide cavity are sleeve-shaped to fit into the cylindrical cavity. In this case, to ensure that the screw cylinder 21 and the locking ring slide linearly within the slide cavity, a linear groove 14 provided on the surface of the housing 1 can be used to constrain the movement direction of the dose locking block 53 and the dose adjustment block 22. The aforementioned linear groove 14 is distributed along the cavity extension direction of the slide cavity; the connection between the dose locking block 53 and the locking ring, and the connection between the dose adjustment block 22 and the screw cylinder 21, are all embedded in the aforementioned linear groove 14.

[0054] Based on the above structure, the outer wall of the housing 1 may include a planar sliding surface I, on which the aforementioned linear slide groove 14 is disposed. Both the regulator push plate 221 of the dose adjustment block 22 and the locking push plate 531 of the dose locking block 53 are provided with sliding surfaces II that can slide against the sliding surface I. On the one hand, the dose adjustment block 22 and the dose locking block 53 respectively contact the sliding surface I of the housing 1 through their respective sliding surfaces II, making it convenient for the user to apply a constant directional force to the dose adjustment block 22 and the dose locking block 53, thereby improving the accuracy and safety of the operation. On the other hand, the dose adjustment block 22 and the dose locking block 53 are attached to the housing 1, which can effectively control the overall size of the quantitative injection device and improve the product appearance.

[0055] For this quantitative injection device, in addition to considering the relative motion and locking relationships of the locking device 5, the dosing device 4, and the regulator 2, it is also necessary to consider the relative motion relationship between the pre-filled syringe plunger 31 of the push rod 3 and the pre-filled syringe 01 installed in the housing 1. Since the locking device 5, the dosing device 4, and the regulator 2 achieve quantitative control of the injection volume by restricting the movement range of the pre-filled syringe plunger 31 toward the pre-filled syringe 01, the locking device 5, the dosing device 4, and the regulator 2 are often positioned between the pre-filled syringe plunger 31 and the pre-filled syringe 01. To optimize the product structure of this quantitative injection device, the locking device 5, the dosing device 4, the regulator 2, the pre-filled syringe plunger 31, and the pre-filled syringe 01 can be aligned in a straight line. In this case, the locking device 5, the dosing device 4, and the regulator 2 each have a central hole through which the pre-filled syringe plunger 31 can pass.

[0056] For example, the housing 1 includes a head 11 and a tail 12, and the head 11 and tail 12 are respectively located at both ends along the cavity extension direction of the sliding cavity. The four components, namely the locking device 5, the dosing device 4, the regulator 2 and the push handle 32 of the push rod 3, are distributed sequentially from the head 11 to the tail 12. The pre-filled syringe push rod 31 of the push rod 3 passes through the central hole of the regulator 2, the central hole of the dosing device 4 and the central hole of the locking device 5 in sequence and extends to the head 11 of the housing 1, and then abuts against the pre-filled syringe 01 located at the head 11 of the housing 1.

[0057] For the push rod 3, when it moves toward the pre-filled syringe 01, the endpoint of its movement is limited by the adjuster 2. When the push rod 3 moves away from the pre-filled syringe 01, the endpoint of its movement is limited by the housing limiting part located between the housing 1 and the push rod 3, thereby preventing the push rod 3 from being pulled out from the tail 12 of the housing 1 and causing the push rod 3 to separate from the housing 1. The pre-filled syringe plunger 31 and the push handle 32 of the push rod 3 are fixedly connected, and the user applies pressure to the pre-filled syringe plunger 31 through the push handle 32.

[0058] The aforementioned housing limiting part may specifically include a limiting slot 141 provided in the linear slide groove 14 of the housing 1 and a limiting block 321 provided in the push rod 3 for locking at the aforementioned limiting slot 141.

[0059] In addition, the quantitative injection device can be provided with a card interface 15 for mounting a pre-filled syringe 01 on the head 11 of the housing 1, so that different pre-filled syringes 01 can be quickly installed on the head 11 of the housing 1 through the card interface 15, thereby realizing the reusability of the quantitative injection device.

[0060] In summary, the quantitative injection device provided in this application, depending on the specific type of the pre-filled syringe 01, can be applied to the injection of substances such as vaccines and insulin.

[0061] In addition to enabling adjustable quantitative injection, this quantitative injection device has the advantage of low failure rate due to fewer parts and simple assembly relationships. It also has the advantages of safety, reliability, and easy and flexible control of injection volume during the injection process due to the use of conventional mechanical cooperation such as the screw connection between the regulator 2 and the dosing device 4 and the concave-convex embedding between the dosing device 4 and the locking device 5.

[0062] Considering the application scenarios of this quantitative injection device, the various components of the device are preferably made of medical resin materials for injection molding. Therefore, the quantitative injection device also has the advantages of low cost, safety and environmental protection, and easy and quick recycling.

[0063] The quantitative injection device provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A quantitative injection device, characterized in that, The device includes a housing (1) with a sliding cavity, an adjuster (2) and a push rod (3); the adjuster (2) slides along the sliding cavity; the sliding cavity is provided with a plurality of dose positions for the adjuster (2) to be positioned along the sliding direction; the push rod (3) includes a pre-filled syringe plunger (31) that slides along the sliding cavity and a push handle (32) that is fixed to the pre-filled syringe plunger (31) and used to abut against the adjuster (2); It also includes a dosing device (4) and a locking device (5) with a limiting strip (51); the regulator (2) and the locking device (5) both slide linearly along the sliding cavity; one end of the dosing device (4) is screwed into the regulator (2), and the other end of the dosing device (4) is provided with a plurality of limiting grooves (41) distributed circumferentially; the relative position relationship between the regulator (2) and all the dosing positions corresponds one-to-one with the relative position relationship between the limiting strip (51) and all the limiting grooves (41); the limiting grooves (41) are used to engage with the limiting strips (51) in a concave-convex manner.

2. The quantitative injection device according to claim 1, characterized in that, The dosing device (4) has a plurality of readings (6) that correspond one-to-one with all the dose positions on its periphery; the display window (13) of the housing (1) is used to display the reading (6) of the dosing device (4) at the current dose position.

3. The quantitative injection device according to claim 2, characterized in that, The surface of the lock (5) is provided with a reference mark (52); the reference mark (52) is flush with one of the limiting grooves (41) when it is engaged in the limiting strip (51).

4. The quantitative injection device according to claim 1, characterized in that, The regulator (2) includes a spiral cylinder (21) with threads on its outer periphery and a dose adjustment block (22) fixedly connected to the spiral cylinder (21); the spiral cylinder (21) is slidably installed in the sliding cavity, and the dose adjustment block (22) is located outside the housing (1).

5. The quantitative injection device according to claim 4, characterized in that, The locking device (5) includes a locking ring slidably installed in the sliding cavity and a dose locking block (53) fixedly connected to the locking ring; the limiting strip (51) is provided on the inner ring wall of the locking ring; the dose locking block (53) is located outside the housing (1).

6. The quantitative injection device according to claim 5, characterized in that, The outer wall of the housing (1) includes a planar sliding surface I; the dose adjustment block (22) and the dose locking block (53) both have a sliding surface II that slides in contact with the sliding surface I.

7. The quantitative injection device according to any one of claims 1 to 6, characterized in that, The housing (1) includes a head (11) and a tail (12) located at both ends of the sliding cavity; the lock (5), the dosing device (4), the regulator (2) and the push handle (32) are distributed sequentially from the head (11) to the tail (12); the lock (5), the dosing device (4) and the regulator (2) are each provided with a central hole through which the pre-filled syringe push rod (31) can pass.

8. The quantitative injection device according to claim 7, characterized in that, A housing limiting part is provided between the housing (1) and the push rod (3) to prevent the pre-filled syringe push rod (31) from being pulled out toward the tail (12).

9. The quantitative injection device according to claim 1, characterized in that, The housing (1) includes a head (11) and a tail (12) located at both ends of the sliding cavity; the head (11) is provided with a locking interface (15) for mounting a pre-filled syringe (01); the regulator (2) and the push rod (3) are distributed sequentially from the head (11) to the tail (12).

Images