Quantitative injection instrument

Abstract

The invention discloses a quantitative injection instrument which comprises a cylinder body assembly, a dosage adjusting assembly, a pressing assembly, a transmission clutch assembly and a pushing assembly. The barrel body assembly comprises a pen body; the dosage adjusting assembly is mounted on the pen body and is suitable for rotating and moving relative to the pen body to adjust the injection dosage; a first clutch mechanism suitable for being connected to link the pressing assembly and the dose adjusting assembly and separated to disconnect linkage is arranged between the pressing assembly and the dose adjusting assembly. The transmission clutch assembly comprises a transmission connecting rod and a clutch piece which are connected, the clutch piece is fixedly connected with the dose adjusting assembly, and the upper end of the transmission connecting rod abuts against the pressing assembly. A second clutch mechanism is arranged between the transmission connecting rod and the clutch piece, the second clutch mechanism is suitable for being connected to link the rotating action of the dose adjusting assembly and the transmission connecting rod and being separated to disconnect the linkage of the rotating action, and an elastic acting mechanism is further arranged between the transmission connecting rod and the clutch piece. According to the invention, the arrangement of parts is reduced, the structure is simplified, and dosage adjustment and quantitative pushing can be facilitated.

Description

Technical Field

[0001] This invention relates to a quantitative injection device, belonging to the field of medical device technology. Background Technology

[0002] Currently, quantitative injection devices are medical devices that can be used to inject materials in a quantitative manner, such as insulin, growth hormone, targeted therapy drugs, etc.

[0003] Patent CN208905879U discloses a quantitative injection pen with a hidden injection needle. In this pen, when adjusting the dosage, rotating the dosage adjustment and display knob (e.g., clockwise) moves the knob up to the desired scale. The tailstock connecting cylinder and the dosage adjustment and display knob rotate together and move up under the drive of the clutch ratchet and the second ratchet. Because there is a skipping space between the clutch ratchet and the second ratchet (the compression spring can be further compressed at this time), the dosage adjustment and display knob cannot drive the rotating push rod and the screw to rotate. In this quantitative injection pen, the following parts need to be specially designed: the clutch ratchet, the second ratchet, and the compression spring, etc., which makes the structure relatively complex and inconvenient to assemble. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a quantitative injection device that not only reduces the number of parts and simplifies the structure, but also facilitates dose adjustment and quantitative delivery.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a quantitative injection device, comprising:

[0006] A pen body assembly, the pen body assembly including a pen body;

[0007] A dose adjustment component is mounted on the pen body and is adapted to move upward relative to the pen body in a forward direction or downward in a reverse direction to adjust the injection dose;

[0008] The pressing assembly and the dose adjustment assembly are provided with a first clutch mechanism adapted to engage to link the pressing assembly and the dose adjustment assembly and to disengage to break the linkage;

[0009] A transmission clutch assembly includes a connected transmission link and a clutch element. The clutch element is fixedly connected to the dosage adjustment assembly. The upper end of the transmission link abuts against the pressing assembly. A second clutch mechanism is provided between the transmission link and the clutch element to engage to link the rotational movement of the dosage adjustment assembly and the transmission link, and to disengage to break the linkage of the rotational movement. An elastic action mechanism is also provided between the transmission link and the clutch element.

[0010] A pushing component, wherein the pushing component is connected to the transmission link;

[0011] When the pressing component is not pressed, the first clutch mechanism engages and the second clutch mechanism disengages under the force of the elastic action mechanism, and the dose adjustment component is driven to move upward in the forward direction or downward in the reverse direction by rotating the pressing component to adjust the injection dose.

[0012] When the pressing component is pressed, the force of the elastic action mechanism is overcome to disengage the first clutch mechanism, and the second clutch mechanism is engaged by driving the transmission link to move downward. The dosage adjustment component moves downward with the pressing component through the transmission clutch component and reverses relative to the pen body when moving downward, thereby driving the transmission link to rotate through the second clutch mechanism and thus linking the pushing component to push the material.

[0013] Furthermore, a specific structure for a pressing component is provided, the pressing component comprising:

[0014] The inner rotating cylinder has its lower end abutting against the upper end of the transmission connecting rod.

[0015] A knob that is fixedly connected to the upper end of the inner rotating cylinder.

[0016] Furthermore, a specific structure of a first clutch mechanism is provided, the first clutch mechanism comprising:

[0017] A first clutch tooth is provided on one of the dose adjustment assembly and the pressing assembly;

[0018] A first mating tooth is provided on the other of the dose adjustment assembly and the pressing assembly; wherein...

[0019] When the pressing component is not pressed, the first clutch tooth and the first mating tooth are engaged under the force of the elastic action mechanism;

[0020] When the pressing component is pressed, the force of the elastic action mechanism is overcome to separate the first clutch tooth and the first mating tooth.

[0021] Furthermore, a specific configuration of the elastic action mechanism is provided, the elastic action mechanism including at least one elastic leg disposed on the clutch and adapted to deform when acted upon to exceed the deformation critical force, the free end of the elastic leg abutting against the lower end of the transmission link.

[0022] Furthermore, to provide auditory feedback to the user during dose adjustment, the dosing device also includes a first auditory feedback component adapted to interact with the dose adjustment component to produce sound when the dose adjustment component moves upward relative to the pen body in a forward orientation or downward in a reverse orientation to adjust the injection dose. The first auditory feedback component includes:

[0023] Ratchet teeth are provided on the lower end of the transmission link and are arranged circumferentially along the transmission link;

[0024] A sound-producing tooth is disposed on the free end of at least one of the elastic legs and engages with the ratchet teeth; wherein...

[0025] When the pressing component is not pressed and the dosage adjustment component is moved upward in the forward direction or downward in the reverse direction to adjust the injection dosage by rotating the pressing component, the clutch rotates together with the dosage adjustment component, so that the sound-producing teeth and the ratchet teeth are sequentially misaligned and engaged to produce sound.

[0026] Furthermore, a specific structure for a second clutch mechanism is provided, the second clutch mechanism comprising:

[0027] Ratchet teeth are provided on the lower end of the transmission link and are arranged circumferentially along the transmission link;

[0028] The second clutch tooth is provided on the clutch component; wherein...

[0029] When the pressing component is pressed, the pressing component drives the transmission link to move downward and overcomes the force of the elastic mechanism to engage the ratchet teeth and the second clutch teeth.

[0030] Furthermore, the quantitative injection device also includes a dose adjustment indication component, which includes a nut connected to the outer wall of the transmission link via a threaded connection mechanism. At least one limiting guide mechanism is provided between the nut and the dose adjustment component. The limiting guide mechanism is configured such that the nut rotates with the dose adjustment component and moves freely axially relative to the dose adjustment component.

[0031] During the dose adjustment process, when the dose adjustment component is moving upward to increase the dose, the nut rotates with the dose adjustment component and moves downward relative to the transmission link under the action of the threaded connection mechanism;

[0032] During dose adjustment, when the dose adjustment component moves downwards in reverse to reduce the dose, the nut rotates with the dose adjustment component and moves upwards relative to the transmission link under the action of the threaded connection mechanism.

[0033] Furthermore, a specific structure for a limiting and guiding mechanism is provided, the limiting and guiding mechanism comprising:

[0034] An axially extending slot is provided on the dose adjustment assembly;

[0035] Ribs are provided on the nut and engage with the long groove.

[0036] Furthermore, to demonstrate that no further dose adjustment is possible and to indicate to the user that the dose has been exhausted, the lower end of the transmission linkage is provided with an abutment at the end of its thread; when the dose adjustment assembly is rotated upward to its maximum position, the nut moves downward to engage with the abutment.

[0037] Furthermore, in order to facilitate the up-and-down movement of the transmission link relative to the feedback link during dose adjustment, the pushing assembly also includes a feedback link, which is sleeved on the feedback link and moves axially and is circumferentially limited relative to the feedback link.

[0038] By adopting the above technical solution, this invention provides a transmission link and a clutch, with an elastic mechanism positioned between the transmission link and the clutch, a first clutch mechanism positioned between the pressing assembly and the dosage adjustment assembly, and a second clutch mechanism positioned between the transmission link and the clutch. This reduces the number of components and simplifies the structure. Simultaneously, the cooperation of the first clutch mechanism, the second clutch mechanism, and the elastic mechanism effectively achieves the functions of dosage adjustment and material delivery. Specifically, in this invention, when the pressing assembly is not pressed (i.e., dosage adjustment), the elastic mechanism engages the first clutch mechanism and disengages the second clutch mechanism. At this time, rotating the pressing component drives the dosage adjustment component to move upward in the forward direction to increase the injection dose or downward in the reverse direction to decrease the injection dose. When the pressing component is pressed (i.e., the material is pushed), the elastic mechanism is first overcome to disengage the first clutch mechanism. Then, the transmission link is driven to move downward to engage the second clutch mechanism. At this time, due to the engagement of the second clutch mechanism, the dosage adjustment component can move downward with the pressing component and reverse relative to the pen body when moving downward. This further drives the transmission link to rotate through the second clutch mechanism, thereby linking the pushing component to push the material. Through the above process, dosage adjustment and quantitative pushing are facilitated. Attached Figure Description

[0039] Figure 1 This is a perspective view of the quantitative injection device of the present invention;

[0040] Figure 2 A cross-sectional view of the structure of the quantitative injection device of the present invention. Figure 1 ;

[0041] Figure 3 A cross-sectional view of the structure of the quantitative injection device of the present invention. Figure 2 ;

[0042] Figure 4 This is an exploded view of the assembly of the quantitative injection device of the present invention;

[0043] Figure 5 This is a cross-sectional view of the pen body of the present invention;

[0044] Figure 6 This is a schematic diagram showing the connection between the scale cylinder and the knob of the present invention;

[0045] Figure 7 This is a cross-sectional view of the scale cylinder of the present invention;

[0046] Figure 8 This is a perspective view of the knob of the present invention;

[0047] Figure 9 This is a cross-sectional view of the inner rotating cylinder of the present invention;

[0048] Figure 10 This is a schematic diagram showing the connection between the transmission link and the clutch component of the present invention;

[0049] Figure 11 This is a schematic diagram of the transmission link of the present invention;

[0050] Figure 12 This is a cross-sectional view of the transmission link of the present invention;

[0051] Figure 13 The three-dimensional clutch component of the present invention Figure 1 ;

[0052] Figure 14 The three-dimensional clutch component of the present invention Figure 2 ;

[0053] Figure 15 This is a perspective view of the nut of the present invention;

[0054] Figure 16 This is a perspective view of the connection between the feedback link and the lower fixing member of the present invention;

[0055] In the diagram, 11 is the pen body; 11a is the threaded rail; 11b is the stop surface; 11c is the viewing window slot; 12 is the pen refill holder; 13 is the cartridge bottle; 14 is the lower fixing part; 14a is the one-way ratchet part.

[0056] 2. Pressing assembly; 21. Inner rotating cylinder; 21a. Opening; 21b. Slot; 21c. First mating tooth; 21d. Step; 22. Knob; 22a. Inverted buckle; 22b. Boss;

[0057] 3. Transmission link; 31. Ratchet tooth; 32. Abutment platform; 33. Limiting protrusion;

[0058] 4. Clutch element; 41. Hook; 42. Elastic leg; 43. Sound-emitting tooth; 44. Clutch ring; 45. Connecting wall; 46. Second clutch tooth;

[0059] 51. Push plate; 52. Piston screw; 52a. Flat surface; 53. Feedback linkage; 53a. Limit groove; 53b. One-way pawl; 53b1. Paddle;

[0060] 6. Scale cylinder; 61. Threaded groove; 62. End groove; 63. Stop platform; 64. Stop groove; 65. First clutch tooth; 66. Folded edge; 67. Long groove;

[0061] 7. Nut; 71. Rib. Detailed Implementation

[0062] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0063] In this embodiment, as Figure 2 As shown, in the quantitative injection device, one end of the knob 22 is the upper end, and the other end of the needle is the lower end.

[0064] Specifically, such as Figures 1-16 As shown, a quantitative injection device includes:

[0065] The body assembly includes the pen body 11;

[0066] A dose adjustment component is mounted on the pen body 11 and is adapted to move upward relative to the pen body 11 in a positive direction or downward in a negative direction to adjust the injection dose.

[0067] The pressing assembly 2 and the dose adjustment assembly are provided with a first clutch mechanism that is suitable for engaging to link the pressing assembly 2 and the dose adjustment assembly and for disengaging to break the linkage.

[0068] The transmission clutch assembly includes a connected transmission link 3 and a clutch element 4. The clutch element 4 is fixedly connected to the dosage adjustment assembly. The upper end of the transmission link 3 abuts against the pressing assembly 2. A second clutch mechanism is provided between the transmission link 3 and the clutch element 4 to engage in linkage with the rotational movement of the dosage adjustment assembly and the transmission link 3 and to disengage to break the linkage of the rotational movement. An elastic action mechanism is also provided between the transmission link 3 and the clutch element 4.

[0069] The push component is connected to the transmission link 3;

[0070] When the pressing component 2 is not pressed, the first clutch mechanism engages and the second clutch mechanism disengages under the force of the elastic action mechanism, and the dose adjustment component is driven to move upward in the forward direction or downward in the reverse direction by rotating the pressing component 2 to adjust the injection dose.

[0071] When the pressing component 2 is pressed, the force of the elastic action mechanism is overcome to disengage the first clutch mechanism, and the second clutch mechanism is engaged by driving the transmission link 3 to move downward. The dosage adjustment component moves downward with the pressing component 2 through the transmission clutch component and reverses relative to the pen body 11 when moving downward. Thus, the transmission link 3 is rotated through the second clutch mechanism, thereby driving the push component to push the material.

[0072] In this embodiment, as Figures 1-4 As shown, the cylinder assembly also includes a refill holder 12, on which a cassette 13 is mounted. The pushing assembly includes a pusher plate 51 placed inside the cassette 13. The pushing assembly moves to drive the pusher plate 51 to move up and down, thereby pushing the piston inside the cassette 13 to push the material. This is prior art and will not be described in detail in this embodiment.

[0073] Specifically, to facilitate the upward or downward rotation of the scale cylinder 6 relative to the pen body 11, such as Figure 6 , 7 As shown, the dosage adjustment assembly includes a scale cylinder 6. A guide mechanism is provided between the inner wall of the pen body 11 and the outer wall of the scale cylinder 6, which extends spirally in the circumferential direction and cooperates with each other to guide the movement of the scale cylinder 6.

[0074] In this embodiment, as Figure 5 , 6 As shown in Figure 7, the guiding mechanism can specifically be structured as follows: it includes a threaded rail 11a extending circumferentially spirally on the inner wall of the pen body 11 and a threaded groove 61 on the outer wall of the scale cylinder 6, with the threaded groove 61 and the threaded rail 11a cooperating with each other; of course, in some embodiments, the guiding mechanism can also be configured as follows: the threaded rail 11a is disposed on the outer wall of the scale cylinder 6, and the threaded groove 61 is disposed on the inner wall of the pen body 11.

[0075] In addition, such as Figure 2 As shown, the outer wall of the graduated cylinder 6 is also provided with a dosage scale, and the pen body 11 is provided with a through window groove 11c, through which the dosage scale on the graduated cylinder 6 can be observed.

[0076] In this embodiment, as Figure 2 , 3 As shown, the clutch element 4 is specifically fixedly connected to the lower end of the graduated cylinder 6, specifically, as... Figure 13 , 14 As shown, the outer wall of the clutch 4 is provided with a hook 41, and the scale cylinder 6 is provided with an end groove 62. The hook 41 is inserted into the end groove 62, thereby making the clutch 4 and the scale cylinder 6 fixedly connected.

[0077] Specifically, in order to prevent the dose adjustment component from rotating further upward when it has reached the maximum single dose, such as Figure 5 , 6As shown, a limiting mechanism is also provided between the inner wall of the pen body 11 and the outer wall of the scale cylinder 6, which is suitable for engaging when the scale cylinder 6 rotates upward to the maximum stroke to prevent the scale cylinder 6 from continuing to rotate upward.

[0078] Specifically, in this embodiment, such as Figures 5-6 As shown, the limiting mechanism can specifically have the following structure: including:

[0079] A stop platform 63 is set on the graduated cylinder 6;

[0080] A stop surface 11b is set on the pen body 11 and engages with the stop platform 63.

[0081] Specifically, in this embodiment, such as Figure 6 As shown, the stop platform 63 can be set on the scale cylinder 6 in the following manner: a stop groove 64 is opened at the lower end of the scale cylinder 6 near the end of the threaded groove 61, the stop platform 63 extends from one side wall of the stop groove 64, and the free end of the stop platform 63 is raised outward in the radial direction of the scale cylinder 6.

[0082] Of course, in some embodiments, the limiting mechanism may also be configured as follows: the stop platform 63 is disposed on the pen body 11, and the stop surface 11b is disposed on the scale cylinder 6.

[0083] In this embodiment, as Figure 2 , 3 As shown, the pressing component 2 can specifically have the following structure, including:

[0084] The lower end of the inner rotating cylinder 21 abuts against the upper end of the transmission connecting rod 3;

[0085] A knob 22 is fixedly connected to the upper end of the inner rotating cylinder 21.

[0086] Specifically, in this embodiment, such as Figure 2 , 3 As shown, the inner rotating cylinder 21 is installed inside the scale cylinder 6, and the knob 22 and the inner rotating cylinder 21 can be fixed in the following way: Figure 8 , 9 As shown, the knob 22 has an inverted buckle 22a inside. The lower end of the inverted buckle 22a has a buckle flange extending radially outward. The upper end of the inverted buckle 22a has a boss 22b extending radially outward. The upper end of the inner rotating cylinder 21 has an opening 21a with a diameter smaller than that of the body of the inner rotating cylinder 21. The opening 21a has a slot 21b corresponding to the boss 22b. The opening 21a and the body of the inner rotating cylinder 21 form a step 21d. The inverted buckle 22a extends into the opening 21a so that the buckle flange is engaged on the lower step surface of the step 21d. The boss 22b is engaged in the slot 21b, thereby fixing the knob 22 and the inner rotating cylinder 21 together.

[0087] Specifically, such as Figure 7 , 9 As shown, the first clutch mechanism can specifically have the following structure, including:

[0088] The first clutch tooth 65 is set on the dose adjustment assembly;

[0089] A first mating tooth 21c is provided on the pressing component 2; wherein,

[0090] When the pressing component 2 is not pressed, the first clutch tooth 65 and the first mating tooth 21c are engaged under the force of the elastic action mechanism.

[0091] When the pressing component 2 is pressed, the force of the elastic action mechanism is overcome to separate the first clutch tooth 65 and the first mating tooth 21c.

[0092] In this embodiment, as Figure 2 , 7 As shown in Figure 9, the first clutch tooth 65 can be specifically set at the upper end of the scale cylinder 6. The upper end of the scale cylinder 6 is provided with an inwardly folded edge 66. The folded edge 66 cooperates with the step 21d formed above. The first clutch tooth 65 is set on the inner end of the folded edge 66 and its orientation is radially inward. The first mating tooth 21c is set on the upper step surface of the step 21d and its orientation is axially upward.

[0093] Of course, in some embodiments, the first clutch tooth 65 may also be disposed on the inner rotating cylinder 21 of the pressing component 2, and the first mating tooth 21c may be disposed on the scale cylinder 6.

[0094] Specifically, in this embodiment, such as Figure 10 , 13 As shown in Figure 14, the elastic action mechanism includes at least one elastic leg 42 disposed on the clutch 4 and adapted to deform when acted upon to exceed the deformation critical force, the free end of the elastic leg 42 abutting against the lower end of the transmission link 3.

[0095] Specifically, in this embodiment, in order to provide the user with auditory feedback during dose adjustment, such as... Figures 10-14 As shown, the quantitative injection device also includes a first auditory feedback component adapted to interact with the dose adjustment component to produce sound when it moves upward relative to the pen body 11 in a positive direction or downward in a negative direction to adjust the injection dose. The first auditory feedback component may specifically have the following structure, including:

[0096] A ratchet tooth 31 is provided on the lower end of the transmission link 3 and is arranged around the circumference of the transmission link 3;

[0097] A sound-producing tooth 43 is disposed on the free end of at least one of the elastic legs 42 and engages with the ratchet tooth 31; wherein...

[0098] When the pressing component 2 is not pressed and the dose adjustment component is moved upward in the forward direction or downward in the reverse direction to adjust the injection dose by rotating the pressing component 2, the clutch 4 rotates together with the dose adjustment component, so that the sound-producing teeth 43 and the ratchet teeth 31 are sequentially misaligned in the circumferential direction to produce sound.

[0099] Specifically, in this embodiment, the clutch element 4 is configured with the following structure: Figure 13 , 14 As shown, the clutch component 4 includes a clutch ring 44, with a connecting wall 45 corresponding to the elastic leg 42 disposed downward on the clutch ring 44. The connecting end of the elastic leg 42 is connected to the connecting wall 45. The elastic leg 42 extends in a ring shape and its diameter is smaller than that of the clutch ring 44. The free end of the elastic leg 42 is curved upward. The body of the elastic leg 42 and the clutch ring 44 are spaced apart in the axial direction. The sound-emitting teeth 43 are disposed on the corresponding free end. In this embodiment, there are two elastic legs 42 and two connecting walls 45, but it is not limited to this.

[0100] Specifically, in this embodiment, such as Figures 10-14 As shown, the second clutch mechanism can specifically have the following structure, including:

[0101] A ratchet tooth 31 is provided on the lower end of the transmission link 3 and is arranged around the circumference of the transmission link 3;

[0102] A second clutch tooth 46 is provided on the clutch component 4; wherein...

[0103] When the pressing component 2 is pressed, the pressing component 2 drives the transmission link 3 to move downward and overcomes the force of the elastic mechanism to make the ratchet tooth 31 and the second clutch tooth 46 mesh. Specifically, when the pressing component 2 is pressed, the pressing component 2 drives the transmission link 3 to move downward, causing the elastic leg 42 to deform downward, so that the ratchet tooth 31 can mesh with the second clutch tooth 46.

[0104] In this embodiment, the ratchet tooth 31 is oriented axially downward, and correspondingly, the sound-emitting tooth 43 is oriented axially upward.

[0105] Specifically, such as Figure 13 , 14 As shown, the second clutch tooth 46 is disposed on the connecting end of the elastic leg 42 and is oriented upward. When the pressing component 2 is not pressed (i.e., dose adjustment), the lowermost end of the sound-emitting tooth 43 on the elastic leg 42 (i.e., the lowest position on the sound-emitting tooth 43 that engages with the ratchet tooth 31) is higher than the uppermost end of the second clutch tooth 46, so as to satisfy the purpose of disengaging the second clutch mechanism when the dose adjustment produces sound to provide auditory feedback.

[0106] Specifically, in this embodiment, such as Figure 2 , 3As shown in Figures 7 and 15, the quantitative injection device also includes a dose adjustment indicator assembly. This assembly includes a nut 7, which is connected to the outer wall of the transmission link 3 via a threaded connection mechanism. At least one limiting guide mechanism is provided between the nut 7 and the dose adjustment assembly. This limiting guide mechanism is configured such that the nut 7 rotates with the dose adjustment assembly and moves freely axially relative to the dose adjustment assembly.

[0107] During the dose adjustment process, when the dose adjustment component is moving upward to increase the dose, the nut 7 rotates with the dose adjustment component and moves downward relative to the transmission link 3 under the action of the threaded connection mechanism;

[0108] During dose adjustment, when the dose adjustment component moves downwards in reverse to reduce the dose, the nut 7 rotates with the dose adjustment component and moves upwards relative to the transmission link 3 under the action of the threaded connection mechanism.

[0109] In a specific configuration, the thread direction on the outer wall of the transmission connecting rod 3 and the thread groove 61 on the outer wall of the scale cylinder 6 are opposite to each other to achieve the above-mentioned effect.

[0110] Specifically, such as Figure 7 , 14 As shown, the limiting and guiding mechanism can specifically have the following structure, including:

[0111] An axially extending slot 67 is provided on the dose adjustment assembly;

[0112] Rib 71 is set on nut 7 and snapped into long groove 67.

[0113] In this embodiment, the long groove 67 is specifically disposed on the graduated cylinder 6.

[0114] Specifically, to demonstrate that no further dosage adjustments can be made, the user is informed that the dosage has been exhausted, such as... Figure 11 As shown, the lower end of the transmission link 3 is provided with an abutment platform 32 at the end of its thread; when the dosage adjustment component is rotated upward to the maximum position, the nut 7 moves downward to abut against the abutment platform 32.

[0115] Specifically, the nut 7 is engaged with the elongated groove 67 of the graduated cylinder 6 by inserting the rib 71 into it. When adjusting the dosage, rotating the pressing assembly 2 drives the graduated cylinder 6 to rotate, and the nut 7 rotates along with the graduated cylinder 6. Since the nut 7 is threadedly engaged with the transmission link 3, it moves axially along the transmission link 3 under the influence of the graduated cylinder 6. The initial position of the nut 7 is at the top of the transmission link 3. Each time the knob 22 is rotated to increase the dosage by rotating the graduated cylinder 6 in the forward direction, the nut 7 is moved downward. When the knob 22 is rotated to decrease the dosage by rotating the graduated cylinder 6 in the reverse direction, the nut 7 is moved upward. After the dosage is adjusted, the position of the nut 7 is fixed and will not change during the material feeding process. Therefore, with each injection, the position of the nut 7 will move closer to the end position until it abuts against the abutment platform 32 of the transmission link 3. At this point, the graduated cylinder 6 cannot be rotated again, and dosage adjustment is not possible, indicating that the dosage has been exhausted.

[0116] Specifically, such as Figure 2 , 3 As shown, the barrel assembly also includes a lower fixing member 14 connected to the pen body 11;

[0117] The pushing assembly includes a plunger screw 52, ​​which is threadedly connected to the lower fixing member 14 and connected to the push plate 51; wherein,

[0118] When the pressing component 2 is not pressed and the dose adjustment component is moved upward in the forward direction or downward in the reverse direction by rotating the pressing component 2 to adjust the injection dose, the transmission link 3 moves up and down with the dose adjustment component and the clutch 4, and the transmission link 3 and the plunger screw 52 do not rotate.

[0119] When the pressing component 2 is pressed and the linkage transmission rod 3 rotates, the transmission rod 3 drives the plunger screw 52 to rotate. The plunger screw 52 moves downward under the action of the thread of the lower fixing part 14 to push the material.

[0120] Specifically, in order to facilitate the up-and-down movement of the transmission link 3 during dosage adjustment and to facilitate the rotation of the plunger screw 52 by the transmission link 3 during material feeding, such as Figure 2 , 3 As shown, the pushing assembly also includes a feedback link 53 that can be axially limited on the lower fixing member 14. The transmission link 3 is sleeved outside the feedback link 53 and moves axially and is circumferentially limited relative to the feedback link 53. The feedback link 53 is sleeved outside the plunger screw 52, ​​and the plunger screw 52 moves axially and is circumferentially limited relative to the feedback link 53.

[0121] In this embodiment, the connection between the transmission link 3 and the feedback link 53 can be specifically configured as follows to allow axial relative movement between the two while maintaining circumferential limitation: (e.g.) Figure 12 , 16As shown, the inner wall of the transmission connecting rod 3 is provided with a limiting protrusion 33, and the outer wall of the feedback connecting rod 53 is provided with a limiting groove 53a extending axially, with the limiting protrusion 33 embedded in the limiting groove 53a; of course, in some embodiments, the limiting protrusion 33 can also be provided on the outer wall of the feedback connecting rod 53, and the limiting groove 53a can also be correspondingly provided on the inner wall of the transmission connecting rod 3; in addition, the connection between the plunger screw 52 and the feedback connecting rod 53 can be specifically set as follows so that the two can move axially relative to each other while being circumferentially limited: such as Figure 4 As shown, the outer wall of the plunger screw 52 is provided with at least one flat surface 52a, and the inner wall of the feedback link 53 is provided with a corresponding flat mating surface. When the feedback link 53 is sleeved on the outside of the plunger screw 52, ​​the flat surface 52a and the corresponding flat mating surface abut against each other.

[0122] Specifically, in order to provide the user with auditory feedback during material delivery, and to limit the feedback linkage 53 and plunger screw 52 to unidirectional drive to prevent leakage caused by reverse rotation of the feedback linkage 53 and plunger screw 52 during dosage adjustment, such as... Figure 2 , 3 As shown in Figure 16, the quantitative injection device further includes a second auditory feedback component adapted to interact with the pressing component 2 to produce sound when the material is pushed out. The second auditory feedback component may specifically have the following structure, including:

[0123] A one-way ratchet portion 14a is provided on the lower fixing member 14;

[0124] A one-way ratchet portion 53b is mounted on the feedback link 53 and engages with the one-way ratchet portion 14a.

[0125] Specifically, when the material is pushed, the feedback linkage 53 rotates under the engagement of the second clutch mechanism and the rotation of the scale cylinder 6, thereby causing the one-way pawl 53b to rotate and engage sequentially on the one-way ratchet 14a, thus producing a clicking sound and providing auditory feedback to the user.

[0126] In this embodiment, as Figure 16 As shown, the one-way ratchet portion 14a is arranged around the lower fixing member 14 in a circumferential manner, and its orientation is radially inward. The one-way pawl portion 53b can be specifically arranged as follows: it includes a ring arm, the connecting end of which is connected to the lower outer wall of the feedback link 53. The ring arm is arranged around the lower end of the feedback link 53, and a radially outwardly protruding paddle 53b1 is provided at its free end. The ring arm increases the deformation strength of the one-way pawl portion 53b.

[0127] Of course, in some embodiments, the one-way ratchet portion 14a may also be provided on the feedback link 53, and the one-way pawl portion 53b may be provided on the lower fixing member 14.

[0128] In this embodiment, during dosage adjustment, without pressing the pressing component 2, the user holds the knob 22 and rotates it. At this time, since the pressing component 2 is not pressed, the elastic leg 42 acts upward on the transmission linkage 3, causing the first clutch tooth 65 and the first mating tooth 21c to mesh (i.e., the first clutch mechanism engages), so that the scale cylinder 6 can rotate together with the rotation direction of the inner rotating cylinder 21. When the scale cylinder 6 rotates, it will drive the clutch component 4 to rotate together. The elastic leg 42 of the clutch component 4 is an elastic element, so during dosage adjustment, the sound-emitting tooth 43 on the elastic leg 42 will press down along the rotation direction and engage with the ratchet tooth 3. The first tooth disengages and engages with the second tooth of the ratchet 31, providing auditory feedback to the user by emitting sound; this is the activation of the first auditory feedback component. Additionally, due to the fixed engagement of the knob 22 and the inner rotating cylinder 21, and through the engagement of the first clutch mechanism, the fixed engagement of the scale cylinder 6 and the clutch element 4, and the engagement of the clutch element 4 and the transmission link 3 (the action of the elastic mechanism), the knob 22 can drive the inner rotating cylinder 21, the scale cylinder 6, and the clutch element 4 to rotate upwards or downwards along the direction of the knob 22 during dosage adjustment, thereby increasing or decreasing the required dosage. Furthermore, since the transmission link 3 is engaged between the inner rotating cylinder 21 and the clutch element 4, when the scale cylinder 6 moves upwards or downwards spirally, the transmission link 3 is also driven to move upwards or downwards, but without any rotation.

[0129] After the dosage is adjusted, the user presses the button to start the injection. At this time, the inner rotating cylinder 21 is also driven downward, causing the first engaging tooth 21c on the inner rotating cylinder 21 to disengage from the first clutch tooth 65 on the scale cylinder 6 (i.e., the first clutch mechanism is disengaged). At this time, the scale cylinder 6 can rotate independently of the knob 22 and the inner rotating cylinder 21, that is, the knob 22 and the inner rotating cylinder 21 will not rotate during injection. At the same time, the bottom surface of the inner rotating cylinder 21 abuts against the upper end of the transmission link 3, so that the transmission link 3 is also subjected to a downward force, and the elastic leg 42 is pressed down, thereby causing the ratchet tooth 31 to mesh with the second clutch tooth 46 of the clutch component 4 (i.e., the second clutch mechanism is engaged). At this time, the scale cylinder 6, the clutch component 4, the transmission link 3, and the nut 7 form a whole. The downward force is transmitted from the clutch component 4 to the scale cylinder 6, and the scale cylinder 6 will rotate in the opposite spiral direction. At the same time, the transmission link 3 also rotates under the drive of the rotation of the scale cylinder 6. At the same time, the elastic leg 42 is slightly deformed by the ratchet tooth 31 to store energy. At this time, the feedback link 53 rotates with the transmission link 3. The rotation of the feedback link 53 drives the plunger screw 52 to rotate. The plunger screw 52 is threadedly connected to the lower fixed part 14. Therefore, the plunger screw 52 moves downward along the pen body 11 to push out the liquid medicine. At the same time, when the feedback link 53 rotates, it causes the second auditory feedback component to act, providing auditory feedback to the user during the injection process.

[0130] After the injection is completed, the user releases the knob 22, thereby releasing the deformation energy stored in the elastic leg 42. The elastic leg 42 drives the transmission link 3 and the inner rotating cylinder 21 to return to their original position. As a result, the first clutch tooth 65 and the first mating tooth 21c re-engage (i.e., the first clutch mechanism engages) to prepare for the next use.

[0131] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A metered dose injection device, characterized by, The injection device comprises: a barrel assembly comprising a barrel; a dose adjusting assembly mounted on the barrel and adapted to move upwardly or downwardly relative to the barrel to adjust an injection dose; a pressing assembly and the dose adjusting assembly are provided with a first clutching mechanism adapted to engage to link the pressing assembly and the dose adjusting assembly and disengage to disconnect the link; a transmission clutch assembly comprising a transmission link and a clutching member connected together, the clutching member is fixedly connected with the dose adjusting assembly, the upper end of the transmission link is in abutment with the pressing assembly, the transmission link and the clutching member are provided with a second clutching mechanism adapted to engage to link the rotating action of the dose adjusting assembly and the transmission link and disengage to disconnect the link, and are further provided with an elastic action mechanism; a pushing assembly connected with the transmission link; when the pressing assembly is not pressed, the first clutching mechanism is engaged and the second clutching mechanism is disengaged under the action of the elastic action mechanism, and the dose adjusting assembly is moved upwardly or downwardly by rotating the pressing assembly to adjust an injection dose; when the pressing assembly is pressed, the first clutching mechanism is disengaged by overcoming the action of the elastic action mechanism, and the second clutching mechanism is engaged by driving the transmission link to move downwardly, the dose adjusting assembly is moved downwardly together with the pressing assembly by the transmission clutch assembly and is rotated relative to the barrel, thereby driving the transmission link to rotate and in turn link the pushing assembly to push the material.

2. The metered dose injection device of claim 1, wherein, The pressing assembly comprises: an inner rotating barrel, the lower end of the inner rotating barrel is in abutment with the upper end of the transmission link; a knob fixedly connected on the upper end of the inner rotating barrel.

3. The metered dose injection device of claim 1, wherein, The first clutching mechanism comprises: a first clutching tooth provided on one of the dose adjusting assembly and the pressing assembly; a first matching tooth provided on the other of the dose adjusting assembly and the pressing assembly; wherein when the pressing assembly is not pressed, the first clutching tooth and the first matching tooth are inserted under the action of the elastic action mechanism; when the pressing assembly is pressed, the first clutching tooth and the first matching tooth are disengaged by overcoming the action of the elastic action mechanism.

4. The metered dose injection device of claim 1, wherein, The elastic action mechanism comprises at least one elastic leg provided on the clutching member and adapted to be deformed when the force acting on it exceeds the critical deformation force, the free end of the elastic leg is in abutment with the lower end of the transmission link.

5. The metered dose injection device of claim 4, wherein, Further comprising a first audible feedback assembly adapted to interact to produce sound when the dose adjusting assembly is moved upwardly or downwardly relative to the barrel to adjust an injection dose, the first audible feedback assembly comprises: a ratchet tooth provided on the lower end of the transmission link and arranged circumferentially along the transmission link; a sound producing tooth provided on the free end of at least one of the elastic legs and matched with the ratchet tooth; wherein When the pressing assembly is not pressed and the dose adjusting assembly is rotated to move upward or downward to adjust the injection dose, the clutch rotates with the dose adjusting assembly so that the sound generating teeth are sequentially engaged with the ratchet teeth to generate sound.

6. The metered dose injection device of claim 1, wherein, The second clutch mechanism comprises: ratchet teeth arranged on the lower end of the transmission link and extending circumferentially along the transmission link; second clutch teeth arranged on the clutch; wherein, When the pressing assembly is pressed, the pressing assembly drives the transmission link to move downward and overcomes the force of the elastic action mechanism to engage the ratchet teeth and the second clutch teeth.

7. The metered dose injection device of claim 1, wherein, Further comprising a dose adjusting in place indicating assembly, the dose adjusting in place indicating assembly comprises a nut connected to the outer wall of the transmission link through a threaded connection mechanism, and at least one limiting guide mechanism is arranged between the nut and the dose adjusting assembly, the limiting guide mechanism is configured to allow the nut to rotate with the dose adjusting assembly and move axially freely relative to the dose adjusting assembly; wherein, During dose adjustment, when the dose adjusting assembly is rotated upward to increase the dose, the nut rotates with the dose adjusting assembly and moves downward relative to the transmission link under the action of the threaded connection mechanism; During dose adjustment, when the dose adjusting assembly is rotated downward to decrease the dose, the nut rotates with the dose adjusting assembly and moves upward relative to the transmission link under the action of the threaded connection mechanism.

8. The metered dose injection device of claim 7, wherein, The limiting guide mechanism comprises: a long slot arranged on the dose adjusting assembly and extending axially; a rib arranged on the nut and fitted into the long slot.

9. The metered dose injection device of claim 7, wherein, The lower end of the transmission link is provided with an abutting table at the end position of its thread; when the dose adjusting assembly is rotated upward to the maximum position, the nut moves downward to abuttingly cooperate with the abutting table.

10. The metered dose injection device of claim 13, wherein, The pushing assembly further comprises a feedback link, the transmission link is sleeved outside the feedback link and moves axially and circumferentially relative to the feedback link.

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