Bi-directional dose setting unit and fluid delivery apparatus

Abstract

A bi-directional dose setting unit and a fluid delivery apparatus, belonging to the technical field of drug injection. The bi-directional dose setting unit comprises a housing (21), a dose setting knob (2), a scale setting unit, and a force accumulation unit. An inner wall of the housing (21) is connected to an outer wall of the scale setting unit, and one end of the scale setting unit penetrates out of the housing. The dose setting knob (2) is sleeved outside the housing (21), and the dose setting knob and the housing are connected by means of an elastic structure. By means of pressing the elastic structure, forward and reverse rotations of the dose setting knob (2) can be achieved. When the elastic structure recovers deformation, the elastic structure can limit the relative rotation of the dose setting knob (2) and the housing (21). An inner wall of the dose setting knob (2) is further connected to one end of the scale setting unit penetrating out of the housing (21). The dose setting knob (2) is rotated, the scale setting unit can be driven to rotate, and the scale setting unit generates axial displacement relative to a shell (10), so that forward setting and reverse correction of the dose are achieved, and the force accumulation of the force accumulation unit can be achieved.

Description

A bidirectional dosage setting unit and fluid delivery device Technical Field

[0001] The present invention relates to the field of drug injection technology, and in particular to a bidirectional dose setting unit and a fluid delivery device. Background Art

[0002] Injection devices are commonly used medical devices for administering medications or liquids and are widely used in the medical industry. However, currently available technologies include disposable devices where the drug and device are inseparable. These devices are characterized by single-use, inconvenience, low product utilization, and low value. Other devices also exist where the drug and device are inseparable, but these devices are dose-settable and cannot be reused after the drug is used. Other devices also exist where the drug and device are separable, typically in the form of cartridges, and the device is dose-settable and reusable. However, the dose setting in these devices is irreversible, meaning that if the user incorrectly sets the dose and needs to reset it, it cannot be reversed. This leads to inconvenience in operation and risk of dose mismatch. Some devices also have the potential for over-setting the dose, resulting in numerous uncontrollable risks in operation and the injection process.

[0003] Chinese invention patent CN105477744A discloses a fixed-dose disposable injection pen, comprising an external button, an adjustment rod, a sleeve, a housing, a screw, a refill holder, and a lower housing. The external button is mounted on the upper end of the adjustment rod, the screw is mounted on the adjustment rod via a sleeve, the outer wall of the screw is provided with a slot, and a tooth structure is provided within the slot. The lower end of the sleeve is provided with a claw mechanism. The adjustment rod is sheathed with a housing, the interior of which is provided with a guide groove. The lower end of the housing is provided with a unidirectional tooth surface that forms a rotational adjustment feedback mechanism with the claw mechanism of the sleeve. The bottom of the housing is provided with a claw structure that forms an inverted claw structure with the tooth structure on the screw. The adjustment rod is provided with a guide block that cooperates with the guide groove. This invention does not enable bidirectional dose control setting, meaning that if the dose setting is incorrect, the incorrect dose setting cannot be corrected.

[0004] Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a bidirectional dose setting unit and a fluid delivery device. The technical problem to be solved by the present invention is how to correct the incorrect dose setting during drug injection.

[0006] To solve the above technical problems, the present invention provides a bidirectional dose setting unit, comprising a housing, a dose setting knob, a scale setting unit and a force storage unit;

[0007] The shell is sleeved on the outside of the scale setting unit, the inner wall of the shell is threadedly connected to the outer wall of the scale setting unit, and one end of the scale setting unit passes through the shell; the power storage unit is sleeved on the outside of the scale setting unit;

[0008] The dose setting knob is a hollow structure that is sleeved onto the exterior of the housing, with the two connected by an elastic structure. By squeezing the elastic structure, the dose setting knob can be rotated in both the forward and reverse directions. When the elastic structure recovers its deformation, it limits relative rotation between the dose setting knob and the housing.

[0009] The inner wall of the dose setting knob is also connected to the end of the scale setting unit that passes through the housing to limit relative rotation between the two;

[0010] Rotating the dose setting knob can drive the scale setting unit to rotate, and the scale setting unit produces axial displacement relative to the housing, thereby realizing positive setting and reverse correction of the dose; while the scale setting unit rotates forward, the power storage unit is charged.

[0011] Furthermore, the elastic structure is a meshing tooth structure.

[0012] Furthermore, the elastic structure includes an elastic component, and the elastic component is arranged on the inner wall of the dose setting knob or the outer wall of the housing.

[0013] Furthermore, a plurality of mounting grooves are circumferentially provided inside the dose setting knob for accommodating the elastic component; openings are provided on the sides of the mounting grooves, and the openings are provided on the side walls of the mounting grooves close to the inside of the dose setting knob.

[0014] Furthermore, both ends of the elastic component are arranged in the mounting grooves, and the middle portion of the elastic component is pushed out from the opening.

[0015] Furthermore, the elastic component is an elastic pick.

[0016] Furthermore, rigid meshing teeth are provided on the outer wall of the shell, and the rigid meshing teeth are meshed with the elastic component.

[0017] Furthermore, a connecting portion is provided inside the dose setting knob, a through hole is provided inside the connecting portion, and an engaging tooth groove is provided on the side wall of the through hole. The dose setting knob is engaged with the outer wall of the scale setting unit through the engaging tooth groove to limit relative rotation between the two.

[0018] Furthermore, the scale setting unit includes a clutch, a drive shaft and a scale. The drive shaft is sleeved on the outside of the clutch and the two are snap-connected. The scale is sleeved on the outside of the drive shaft and the two are snap-connected. The outer wall of the scale is provided with an external thread and is threadedly connected to the inner wall of the shell.

[0019] Furthermore, the force storage unit includes a coil spring and a coil spring sleeve, the outer ring of the coil spring is fixedly connected to the inner wall of the coil spring sleeve, the inner ring of the coil spring is fixedly connected to the outer wall of the clutch, and the outer wall of the coil spring sleeve is engaged with the shell to limit the relative rotation between the two; when the dose setting knob is rotated, the clutch is driven to rotate and the coil spring is used to store force.

[0020] Furthermore, a circle of circumferential grooves is provided on the outer wall of the upper part of the shell, and the inner wall of the dose setting knob is circumferentially provided with thorns. The circumferential grooves cooperate with the thorns to limit the axial displacement of the dose setting knob, and the dose setting knob can rotate around the axis.

[0021] The present invention provides a fluid delivery device, comprising the above-mentioned bidirectional dose setting unit, a reset unit, a screw clutch and a screw;

[0022] The scale setting unit passes through the dose setting knob and is connected to the reset unit; the screw clutch is arranged inside the housing, and the screw clutch is arranged below the scale setting unit; after the screw passes through the screw clutch, it is connected to the internal thread of the scale setting unit;

[0023] Rotating the dose setting knob drives the scale setting unit to rotate, and stores force in the force storage unit; applying pressure to the reset unit causes the clutch in the scale setting unit to move axially downward and connect with the screw clutch. At the same time, the restriction of the rotary dose setting on the axial rotation of the clutch is released, and the force of the force storage unit is released, driving the clutch to rotate, and the screw clutch rotates accordingly, producing an axial propulsion effect on the screw; when the force is released, the pressure on the reset unit is cancelled, and the reset unit drives the clutch to move axially upward to reset the scale setting unit.

[0024] Furthermore, a knob cover is provided inside the rotary dose setting knob, which is a hollow structure and is provided above the connecting portion of the rotary dose setting knob; a reset unit is provided at the opening of the knob cover, the reset unit includes an injection button, a clutch cover and a retaining compression spring, the retaining compression spring is sleeved on the outside of the clutch, a clutch cover is sleeved above the retaining compression spring, a through hole is provided inside the clutch cover, one end of the clutch passes through the through hole, the upper surface of the clutch cover abuts against one end of the clutch to prevent the clutch cover from detaching from the clutch; an injection button is provided on the outer cover of the clutch cover; the injection button is slidably connected to the knob cover; the outer edge of the injection button abuts against the opening edge of the knob cover to limit the movement of the injection button away from the clutch.

[0025] The present invention provides a fluid delivery device with bidirectional dose control, wherein a dose setting knob and a housing are connected by an elastic structure; by squeezing the elastic structure, forward and reverse rotation of the dose setting knob can be achieved; when the elastic structure recovers its deformation, the elastic structure can limit relative rotation between the dose setting knob and the housing; the inner wall of the housing is threadedly connected to the outer wall of a scale setting unit, and the inner wall of the dose setting knob is also connected to an end of the scale setting unit that passes through the housing; the scale setting unit includes a clutch, a drive shaft and a scale; the drive shaft is sleeved on the outside of the clutch and the two are snap-connected; the scale is sleeved on the outside of the drive shaft and the two are snap-connected; rotating the dose setting knob can drive the scale setting unit to rotate, and the scale produces axial displacement relative to the housing, thereby achieving forward setting and reverse correction of the dose. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a fluid delivery device with bidirectional dosage control according to the present invention;

[0027] FIG2 is a transverse cross-sectional view of an initial state of a fluid delivery device with bidirectional dosage control according to the present invention;

[0028] FIG3 is a transverse cross-sectional view of a fluid delivery device with bidirectional dosage control according to the present invention after the injection button is pressed;

[0029] FIG4 is a schematic diagram of a spring paddle during dose setting according to a preferred embodiment of the present invention, wherein FIG4(a) is a schematic diagram of the spring paddle engaged with the tooth groove on the housing during dose setting, and FIG4(b) is a schematic diagram of the spring paddle being elastically deformed by the tooth groove on the housing during rotation of the dose setting knob;

[0030] FIG5 is a schematic structural diagram of a dose setting knob, a spring paddle, and a knob cover according to a preferred embodiment of the present invention, wherein FIG5(a) is a longitudinal cross-sectional view of the dose setting knob, and FIG5(b) is a cross-sectional view of the dose setting knob after the spring paddle and the knob cover are assembled;

[0031] FIG6 is a schematic structural diagram of a bidirectional dose setting unit and a spring paddle of a fluid delivery device according to the present invention;

[0032] FIG7 is a schematic diagram of a clutch structure of a bidirectional dose setting unit and a fluid delivery device according to the present invention;

[0033] FIG8 is a schematic diagram of the structure of a bidirectional dose setting unit and a limit ring of a fluid delivery device according to the present invention;

[0034] 9 is an axial cross-sectional view of a screw clutch of a bidirectional dose setting unit and a fluid delivery device according to the present invention;

[0035] FIG10( a ) is a schematic structural diagram of a housing of a bidirectional dose setting unit and a fluid delivery device according to the present invention; FIG10( b ) is an axial cross-sectional view of a housing of a bidirectional dose setting unit and a fluid delivery device according to the present invention;

[0036] FIG11 is an axial cross-sectional view of the inner housing of a bidirectional dose setting unit and a fluid delivery device according to the present invention;

[0037] FIG12 is a schematic diagram of the scale structure of a bidirectional dose setting unit and a fluid delivery device according to the present invention;

[0038] FIG13( a ) is a schematic diagram of the drive shaft structure of a bidirectional dose setting unit and a fluid delivery device according to the present invention; FIG13( b ) is an axial cross-sectional view of the drive shaft of a bidirectional dose setting unit and a fluid delivery device according to the present invention;

[0039] FIG14( a ) is a partial enlarged view of a screw; FIG14( b ) is a top view of a screw of a bidirectional dose setting unit and a fluid delivery device of the present invention;

[0040] FIG15 is a schematic structural diagram of a bidirectional dose setting unit and a coil spring housing of a fluid delivery device according to the present invention;

[0041] FIG. 16 is an exploded view of a fluid delivery device with bidirectional dosage control according to the present invention.

[0042] Reference numerals: 1 injection button, 2 dose setting knob, 3 retaining spring, 4 clutch cover, 5 knob cover, 6 spring paddle, 7 coil spring, 8 coil spring sleeve, 9 lubricating plate, 10 outer shell, 11 inner shell, 12 scale, 13 drive shaft, 14 screw, 15 screw clutch, 16 limiting ring, 17 refill holder, 18 cartridge, 19 pen cap, 20 clutch. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0046] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0047] In order to better understand the purpose, structure and function of the present invention, a bidirectional dose setting unit and a fluid delivery device of the present invention are further described in detail below with reference to the accompanying drawings.

[0048] Example 1:

[0049] As shown in FIG1 , a bidirectional dose setting unit of the present invention includes a housing 21 , a dose setting knob 2 , a scale setting unit, and a force storage unit;

[0050] The housing 21 is sleeved on the outside of the scale setting unit, the inner wall of the housing 21 is threadedly connected to the outer wall of the scale setting unit, and one end of the scale setting unit passes through the housing 21; the power storage unit is sleeved on the outside of the scale setting unit;

[0051] The dose setting knob 2 is a hollow structure. The dose setting knob is sleeved on the outside of the housing, and the two are connected by an elastic structure. By squeezing the elastic structure, the dose setting knob can be rotated in the forward and reverse directions. When the elastic structure recovers its deformation, the elastic structure can limit the relative rotation between the dose setting knob and the housing.

[0052] The inner wall of the dose setting knob 2 is also connected to the end of the scale setting unit that passes through the housing to limit relative rotation between the two.

[0053] Rotating the dose setting knob 2 can drive the scale setting unit to rotate, and the scale setting unit produces axial displacement relative to the housing, thereby realizing positive setting and reverse correction of the dose; while the scale setting unit rotates forward, the power storage unit is charged.

[0054] Example 2:

[0055] As shown in FIG1 , a bidirectional dose setting unit of the present invention includes a housing 21 , a dose setting knob 2 , a scale setting unit, and a force storage unit;

[0056] The housing 21 is sleeved on the outside of the scale setting unit, the inner wall of the housing 21 is threadedly connected to the outer wall of the scale setting unit, and one end of the scale setting unit passes through the housing 21; the power storage unit is sleeved on the outside of the scale setting unit;

[0057] As shown in FIG4 , the dose setting knob 2 is a hollow structure. The dose setting knob is sleeved on the outside of the housing, and the two are connected by an elastic structure. By squeezing the elastic structure, the dose setting knob can be rotated in the forward and reverse directions. When the elastic structure recovers its deformation, the elastic structure can limit the relative rotation between the dose setting knob and the housing.

[0058] The inner wall of the dose setting knob 2 is also connected to the end of the scale setting unit that passes through the housing to limit relative rotation between the two.

[0059] Rotating the dose setting knob 2 can drive the scale setting unit to rotate, and the scale setting unit produces axial displacement relative to the housing, thereby realizing positive setting and reverse correction of the dose; while the scale setting unit rotates forward, the power storage unit is charged.

[0060] This embodiment differs from the first embodiment in that:

[0061] The elastic structure is a meshing tooth structure, including an elastic component, which is arranged on the dose setting knob 2 or on the outer wall of the housing 21; when the elastic component is arranged on the dose setting knob 2, the outer wall of the housing 21 is correspondingly provided with rigid meshing teeth; when the elastic component is arranged on the outer wall of the housing 21, the interior of the dose setting knob 2 is correspondingly provided with rigid meshing teeth;

[0062] Preferably, the elastic component is provided on the outer wall of the upper housing 21 of the dose setting knob 2 and is correspondingly provided with rigid engaging teeth;

[0063] As shown in FIG5 , the interior of the dose setting knob 2 is provided with a plurality of mounting grooves 2-2 along the circumference thereof for accommodating elastic components. The side surfaces of the mounting grooves 2-2 are provided with openings, which are provided on the side walls of the mounting grooves 2-2 near the interior of the dose setting knob 2. As shown in FIG6 , the elastic component is an elastic paddle 6, the ends of which are provided in the mounting grooves 2-2, and the middle portion of the elastic paddle 6 is pushed out of the opening toward the interior of the dose setting knob 2.

[0064] As shown in FIG10 , the spring paddle 6 provided in the dose setting knob 2 is engaged with the seventh meshing tooth 10 - 1 on the outer wall of the housing 10 , and the scale of the seventh meshing tooth 10 - 1 on the outside of the housing 10 and the scale 12 in the scale setting unit have the same scale;

[0065] The dose setting knob 2 is provided with a connecting portion inside, and a through hole is provided inside the connecting portion. The side wall of the through hole is provided with an engaging tooth groove 2-1. The dose setting knob 2 is engaged with the outer wall of the scale setting unit by the engaging tooth groove 2-1 to limit relative rotation between the two.

[0066] The scale setting unit includes a clutch 20, a drive shaft 13, and a scale 12. The drive shaft 13 is sleeved on the outside of the clutch 20, and the two are engaged to restrict relative rotation between them. The scale 12 is sleeved on the outside of the drive shaft 13, and the two are engaged to restrict relative rotation between them.

[0067] As shown in FIG7 , an elastic buckle 20 - 1 is provided on the upper portion of the clutch 20 ;

[0068] The outer wall of the elastic buckle 20 - 1 is provided with a first meshing tooth 20 - 2 , which is engaged with the meshing tooth groove 2 - 1 of the connecting portion of the dose setting knob 2 ;

[0069] As shown in FIG13 , a second meshing tooth 20 - 4 is provided below the first meshing tooth 20 - 2 of the elastic buckle 20 - 1 , and the second meshing tooth 20 - 4 is engaged with the third meshing tooth 13 - 2 on the drive shaft 13 ;

[0070] As shown in FIG12 , the outer wall of the drive shaft 13 is provided with fourth meshing teeth 13 - 1 , which engage with a plurality of grooves 12 - 1 on the inner wall of the scale 12 ;

[0071] The outer wall of the scale 12 is provided with a thread 12-2;

[0072] The housing 21 includes an outer shell 10 and an inner shell 11, which are fixedly connected;

[0073] As shown in Figure 11, the inner wall of the inner shell 11 is provided with an internal thread 11-2 that matches the thread of the scale 12, and the inner wall of the inner shell 11 is provided with a limit stop component 11-3 for limiting the axial movement of the scale 12; the outer wall of the inner shell 11 is provided with a protrusion 11-1 for engaging and fixing with the long groove 10-4 on the outer shell 10.

[0074] The inner shell 11 and the outer shell 10 are provided with a scale observation window 10-3 for observing the setting and correction of the scale 12;

[0075] As shown in FIG10 , the lower portion of the housing 10 is provided with a connecting thread 10 - 5 for connecting to the fluid containing unit;

[0076] The outer wall of the housing 10 is provided with a circumferential groove 10-6 which cooperates with the protrusion 2-3 provided on the inner wall of the dose setting knob 2, that is, the dose setting knob 2 can rotate around the axis relative to the housing 10, limiting the axial displacement of the dose setting knob 2;

[0077] As shown in FIG. 1 , a lubricating sheet 9 is provided above the scale 12 . The lubricating sheet 9 abuts against an annular step surface inside the housing 10 , thereby limiting the axial displacement of the scale 12 .

[0078] Example 3:

[0079] As shown in FIG1 , a bidirectional dose setting unit of the present invention includes a housing 21 , a dose setting knob 2 , a scale setting unit, and a force storage unit;

[0080] The housing 21 is sleeved on the outside of the scale setting unit, the inner wall of the housing 21 is threadedly connected to the outer wall of the scale setting unit, and one end of the scale setting unit passes through the housing 21; the power storage unit is sleeved on the outside of the scale setting unit;

[0081] As shown in FIG4 , the dose setting knob 2 is a hollow structure. The dose setting knob is sleeved on the outside of the housing, and the two are connected by an elastic structure. By squeezing the elastic structure, the dose setting knob can be rotated in the forward and reverse directions. When the elastic structure recovers its deformation, the elastic structure can limit the relative rotation between the dose setting knob and the housing.

[0082] The inner wall of the dose setting knob 2 is also connected to the end of the scale setting unit that passes through the housing to limit relative rotation between the two.

[0083] Rotating the dose setting knob 2 can drive the scale setting unit to rotate, and the scale setting unit produces axial displacement relative to the housing, thereby realizing positive setting and reverse correction of the dose; while the scale setting unit rotates forward, the power storage unit is charged.

[0084] This embodiment differs from the second embodiment in that:

[0085] As shown in FIG1 , the clutch 20 is provided with a force storage unit, which is located between the first meshing tooth 20 - 2 and the second meshing tooth 20 - 3 ;

[0086] As shown in Figures 1 and 15, the power storage unit includes a coil spring 7 and a coil spring sleeve 8. A limiting groove 8-1 is provided on the inner wall of the coil spring sleeve 8. The outer wall of the coil spring sleeve 8 is engaged with the housing 21 to limit relative rotation between the two.

[0087] As shown in FIG7 , the inner ring of the coil spring 7 is fixedly connected to the coil spring limiting structure 20 - 3 on the clutch 20 , and the outer ring of the coil spring 7 is fixedly connected to the limiting groove 8 - 1 ;

[0088] When the dose setting knob 2 is rotated, the clutch 20 is driven to rotate, and the coil spring 7 accumulates force.

[0089] Example 4:

[0090] As shown in FIG1 , a fluid delivery device of the present invention includes the above-mentioned bidirectional dose setting unit, a reset unit, a screw clutch 15 and a screw 14 ;

[0091] The scale setting unit passes through the dose setting knob 2 and is connected to the reset unit; the screw clutch 15 is arranged inside the housing 21.

[0092] The screw clutch 15 is provided below the scale setting unit; the screw 14 passes through the screw clutch 15 and is connected to the internal thread of the scale setting unit;

[0093] Rotating the dose setting knob 2 drives the scale setting unit to rotate, and stores force in the force storage unit; applying pressure to the reset unit causes the clutch 20 in the scale setting unit to move axially downward and connect with the screw clutch 15. At the same time, the restriction on the axial rotation of the clutch 20 by rotating the dose setting 2 is released, and the force of the force storage unit is released, driving the clutch 20 to rotate, and the screw clutch 15 rotates accordingly, producing an axial propulsion effect on the screw 14; when the force is released, the pressure on the reset unit is cancelled, and the reset unit drives the clutch to move axially upward, thereby resetting the scale setting unit.

[0094] This embodiment differs from the above embodiments in that:

[0095] As shown in Figures 1, 5 and 16, the reset unit includes a retaining compression spring 3, a clutch cover 4 and an injection button 1; a knob cover 5 is provided above the connection portion of the rotary dose setting knob 2. The knob cover 5 is a hollow structure. A retaining compression spring 3 is provided inside the knob cover 5. The retaining compression spring 3 is sleeved on the outside of the clutch 20. A clutch cover 4 is provided above the retaining compression spring 3. The clutch cover 4 has a through hole provided inside. The elastic clip 20-1 on the clutch 20 passes through the through hole. The lower surface of the elastic clip 20-1 abuts against the upper surface of the clutch cover 4.

[0096] As shown in Figure 3, the outer cover of the clutch cover 4 is provided with an injection button 1. The outer edge of the injection button 1 abuts against the opening of the knob cover 5, limiting the movement of the injection button 1 away from the device. Pressing the injection button 1 can push the first meshing tooth 20-2 of the clutch 20 out of the connection portion of the dose setting knob 2.

[0097] As shown in Figures 1, 9 and 14, the screw clutch 15 is sleeved on the outside of the screw 14. The screw clutch 15 is arranged below the clutch 20. The ring 15-3 of the screw clutch 15 abuts against the limit step 13-3 at the lower part of the drive shaft 13, limiting the movement of the screw clutch 15 along the axial direction.

[0098] The screw clutch 15 is provided with an internal thread 15-2 for threaded connection with the screw 14;

[0099] The clutch 20 moves downward, and the fifth meshing tooth 20 - 5 of the clutch 20 can be connected with the sixth meshing tooth 15 - 1 on the screw clutch 15 ;

[0100] A connecting hole is provided inside the clutch 20, and the screw 14 passes through the screw clutch 15 and is threadedly connected to the connecting hole;

[0101] As shown in FIG8 , a limit ring 16 is further provided below the screw clutch 15 , and the screw 14 passes through the limit ring 16 and the screw clutch 15 in sequence, and then is connected to the internal thread of the clutch 20 ;

[0102] The buckle 16-1 of the limiting ring 16 cooperates with the buckle groove 11-4 of the inner shell 11 to limit the rotation and axial movement of the limiting ring 16 relative to the outer shell 10. A through hole is provided in the limiting ring 16, and a groove convex 16-3 is provided on the inner wall of the through hole. A groove 14-1 is provided on the screw 14. One end of the screw 14 passes through the interior of the limiting ring 16. The groove convex 16-3 in the limiting ring 16 cooperates with the groove 14-1 on the screw 14. In this way, when the screw clutch 15 rotates, the screw 14 moves axially relative to the device, pushing the fluid in the cartridge 18, which can maximize the stability and accuracy of fluid delivery.

[0103] The limiting ring 16 is provided with an arc transition convex bump 16-2. During the rotation of the drive shaft 13, the friction resistance is reduced through this structure and the self-lubricating characteristics of the component itself. This structure can increase the stability of fluid transportation. Usually, the limiting ring material can be set to a plastic material with self-lubricating properties such as POM\PTFE.

[0104] As shown in Figure 16, a fluid delivery device also includes a fluid containing unit, which includes a refill holder 17, a cartridge bottle 18, and a pen cap 19. The cartridge bottle 18 is contained in the refill holder 17, and the pen cap 19 is sleeved on the outside of the refill holder 17. The refill holder 17 is threaded with the lower part of the shell 10.

[0105] As shown in FIG2 and FIG3, the present invention provides a fluid conveying device, and its working process is as follows:

[0106] When the dose setting knob 2 is rotated, the clutch 20 rotates, the coil spring 7 starts to accumulate force, and the power of the coil spring 7 is not released. At the same time, the seventh meshing tooth 10-1 on the outside of the housing 10 advances one grid. The dose setting knob 2 drives the clutch 20, the drive shaft 13 and the scale 12 to rotate synchronously, and the scale also advances one grid, completing the dose setting step. If the dose setting is incorrect, the dose setting knob 2 can be rotated in the opposite direction to correct the dose setting.

[0107] During the drug injection step, by pressing the injection button 1, the compression spring 3 is kept compressed, the clutch 20 moves axially downward, and the first meshing tooth 20-2 of the clutch 20 is pushed out from the connection portion of the dose setting knob 2, thereby releasing the restriction on the clutch 20 rotating around the axis. The fifth meshing tooth 20-5 of the clutch 20 is engaged with the sixth meshing tooth 15-1 of the screw clutch 15;

[0108] At the same time, the power of the coil spring 7 rotating about the axis is released. Driven by the coil spring 7, the clutch 20 rotates about the axis relative to the housing 10. At this time, the clutch 20 drives the drive shaft 13 and the scale 12 to rotate in the opposite direction. At the same time, the clutch 20 drives the screw clutch 15 and the screw 14 to rotate. The screw 14 undergoes axial displacement, pushing the piston in the cartridge to perform injection.

[0109] After the injection is completed, the injection button 1 is released, and the compression spring 3 is kept reset to drive the clutch 20 to leave the screw clutch 15. The first engaging tooth 20-2 of the clutch 20 is reconnected with the connecting part of the dose setting knob 2, realizing the reset of the dose setting function and the drug advancing function of the device, thereby realizing multiple reuse of the device.

[0110] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. The various embodiments may be combined to form new embodiments, provided that no inconsistencies exist. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A two-way dose setting unit, characterized in that, It includes a housing, a dose setting knob, a scale setting unit, and a power storage unit; The housing is sleeved outside the scale setting unit, the inner wall of the housing is threadedly connected to the outer wall of the scale setting unit, and one end of the scale setting unit passes through the housing; the power storage unit is sleeved outside the scale setting unit; The dose setting knob has a hollow structure, the dose setting knob is sleeved outside the housing, and the two are connected through an elastic structure; By squeezing the elastic structure, the forward and reverse rotation of the dose setting knob can be realized; when the elastic structure returns to its deformed state, the elastic structure can limit the relative rotation between the dose setting knob and the housing; The inner wall of the dose setting knob is also connected to the end of the scale setting unit that passes through the housing, restricting the relative rotation between the two; Rotating the dose setting knob can drive the scale setting unit to rotate, and the scale setting unit generates an axial displacement relative to the outer shell, thereby realizing the forward setting and reverse correction of the dose; while the scale setting unit rotates forward, the power storage unit is charged.

2. The dual-dose setting unit according to claim 1, wherein The elastic structure is a meshing tooth type structure.

3. The bidirectional dose setting unit according to claim 2, characterized in that, The elastic structure includes an elastic component, and the elastic component is arranged on the inner wall of the dose setting knob or on the outer wall of the housing.

4. The two-way dose setting unit according to claim 3, characterized in that, A plurality of mounting grooves are circumferentially arranged inside the dose setting knob for accommodating the elastic component; an opening is arranged on the side of the mounting groove, and the opening is arranged on the side wall of the mounting groove close to the inside of the dose setting knob.

5. The bidirectional dose setting unit according to claim 4, characterized in that, Both ends of the elastic component are arranged in the mounting groove, and the middle part of the elastic component protrudes from the opening.

6. The bidirectional dose setting unit according to claim 5, characterized in that, The elastic component is an elastic flap.

7. The bidirectional dose setting unit according to claim 5, characterized in that, Rigid meshing teeth are arranged on the outer wall of the housing, and the rigid meshing teeth mesh with the elastic component.

8. The two-way dose setting unit according to claim 5, characterized in that, A connecting part is arranged inside the dose setting knob, a through hole is arranged inside the connecting part, meshing tooth grooves are arranged on the side wall of the through hole, and the dose setting knob is clamped with the outer wall of the scale setting unit through the meshing tooth grooves, restricting the relative rotation between the two.

9. The two-way dose setting unit according to claim 8, characterized in that, The scale setting unit includes a clutch, a drive shaft, and a scale ruler. The drive shaft is sleeved outside the clutch, and the two are clamped and connected; the scale ruler is sleeved outside the drive shaft, and the two are clamped and connected; external threads are arranged on the outer wall of the scale ruler and are threadedly connected to the inner wall of the housing.

10. The two-way dose setting unit according to claim 9, characterized in that, The power storage unit includes a torsion spring and a torsion spring sleeve. The outer ring of the torsion spring is fixedly connected to the inner wall of the torsion spring sleeve, the inner ring of the torsion spring is fixedly connected to the outer wall of the clutch, and the outer wall of the torsion spring sleeve is clamped and connected to the housing, restricting the relative rotation between the two; when the dose setting knob is rotated, the clutch is driven to rotate, and the torsion spring is charged.

11. The bidirectional dose setting unit according to claim 9, characterized in that, A circumferential groove is arranged on the outer wall of the upper part of the housing, and protrusions are circumferentially arranged on the inner wall of the dose setting knob. The circumferential groove and the protrusions cooperate to restrict the axial displacement of the dose setting knob, and the dose setting knob can rotate around the axis.

12. A fluid delivery device, characterized in that, It includes a two-way dose setting unit, a reset unit, a screw clutch, and a screw as described in any one of claims 1-11; After the scale setting unit passes through the dose setting knob, it is connected to the reset unit; the screw clutch is arranged inside the housing, and the screw clutch is arranged below the scale setting unit; after the screw passes through the screw clutch, it is threadedly connected to the inside of the scale setting unit; Rotate the dose setting knob to drive the scale setting unit to rotate and charge the energy storage unit; apply pressure to the reset unit, and the clutch in the scale setting unit moves downward along the axial direction to connect with the screw clutch. At the same time, the restriction on the axial rotation of the clutch by the rotating dose setting is released, and the stored energy of the energy storage unit is released, driving the clutch to rotate, and the screw clutch rotates accordingly, generating an axial pushing force on the screw; when the stored energy is completely released, the pressure on the reset unit is cancelled, and the reset unit drives the clutch to move upward along the axial direction to achieve the reset of the scale setting unit.

13. The fluid delivery device according to claim 12, wherein A knob cover is provided inside the rotating dose setting knob. The knob cover is of a hollow structure and is arranged above the connecting part of the rotating dose setting knob; the reset unit is arranged at the opening of the knob cover. The reset unit includes an injection button, a clutch cover and a retaining compression spring. The retaining compression spring is sleeved outside the clutch, and a clutch cover is sleeved above the retaining compression spring. A through hole is provided inside the clutch cover, and one end of the clutch passes through the through hole. The upper surface of the clutch cover abuts against one end of the clutch to prevent the clutch cover from detaching from the clutch; an injection button is covered outside the clutch cover; the injection button is slidably connected to the knob cover; the outer edge of the injection button abuts against the opening edge of the knob cover to limit the injection button from moving away from the clutch.

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