Drug delivery apparatus

Abstract

Provided is a drug delivery apparatus, comprising a pen cylinder (100); a dose sleeve (101); a knob (102), rotatably disposed on a first end (1001) of the pen cylinder (100), connected to the dose sleeve (101) and configured for synchronously rotating with the dose sleeve (101); a driving sleeve (103), received in the dose sleeve (101); a first spiral track (104), disposed on the outer periphery of the driving sleeve (103); a connecting portion (106), disposed at a second end (1002) of the pen cylinder (100) and configured for connecting a drug vial (200); a backstop ratchet (107), located in the pen cylinder (100); a braking portion (108), disposed between the connecting portion (106) and the backstop ratchet (107) to limit the rotation of the backstop ratchet (107); a backstop sleeve (109), received in the driving sleeve (103) and connected to the backstop ratchet (107); a spiral push rod (110), extending through the connecting portion (106), extending out of the pen cylinder (100), and configured for abutting against the drug vial (200), the other end of the spiral push rod (110) extending through the backstop ratchet (107) and passing through the backstop sleeve (109); a button (111), disposed on the first end (1001) of the pen cylinder (100) and movable between a release position and an administration position, the button (111), when located at the administration position, driving the displacement of the drive sleeve (103); and a return spring (112), disposed between the button (111) and the driving sleeve (103) to provide an elastic force to bias the button (111) toward the release position.

Description

Medicament delivery device TECHNICAL FIELD

[0001] The present application relates to the field of medical injection technology, and more particularly, to a medicament delivery device. BACKGROUND

[0002] Injection devices are commonly used medical instruments, which are devices for injecting medicaments subcutaneously, aiming to make the injection of medicaments easier and more convenient to use, thereby improving patient compliance.

[0003] However, conventional injection devices are usually composed of multiple parts, including a housing, a dose setting knob, a transmission mechanism, other detailed components, etc., such as the medicament injection pen disclosed in Chinese Patent Publication No. CN204337431U, which comprises a housing and a dose setting knob rotatable relative to the housing, a brake assembly arranged in the housing and having a ratchet component, and a driver comprising at least one external tooth.

[0004] Although the prior art medicament injection pen provides simple assembly that can be easily customized, the prior art sets the ratchet at the position of the knob, so the knob of the prior art patent can only rotate in one direction, resulting in the medicament injection pen being able to only increase the dose and being unable to decrease the dose, and if the dose adjustment exceeds the predetermined amount, it is irreversible, and the medicament can only be given out by emptying the needle, causing waste of the medicament.

[0005] Furthermore, the prior art injection device also has problems of complex part composition, poor transmission, unstable operation, etc., which may affect the performance and use effect of the injection device and need to be solved and improved in the design and manufacturing process.

[0006] SUMMARY

[0007] In order to overcome the deficiencies of the prior art, the main purpose of the present application is to provide a medicament delivery device, which optimizes the design of the overall structure, simplifies the parts, and is more stable in operation in addition to reducing the transmission relationship.

[0008] Another purpose of the present application is to provide a medicament delivery device, which uses a knob to adjust the injection dose, has small torsion, and is more convenient to operate.

[0009] To achieve the above object, the drug delivery device comprises a pen barrel having a first end and a second end; a dose sleeve sleeved in the pen barrel; a knob rotatably arranged on the first end of the pen barrel and connected with the dose sleeve to rotate synchronously; a drive sleeve sleeved in the dose sleeve; a first helical track arranged on the outer periphery of the drive sleeve along the axial direction of the drive sleeve; a locking ratchet arranged in the dose sleeve and helically arranged on the drive sleeve along the first helical track; a connecting portion arranged on the second end of the pen barrel for connecting a medicine bottle; a retreat prevention ratchet arranged in the pen barrel; a brake portion arranged between the connecting portion and the retreat prevention ratchet to limit the rotation of the retreat prevention ratchet; a retreat prevention sleeve sleeved in the drive sleeve, one end of the retreat prevention sleeve extending towards the position of the second end of the pen barrel and connected with the retreat prevention ratchet; a helical push rod, one end of which penetrates through the connecting portion and is exposed outside the pen barrel for abutting against the medicine bottle, and the other end of which penetrates through the retreat prevention ratchet and is arranged in the retreat prevention sleeve; a button movably arranged on the first end of the pen barrel and moving between a release position away from the drive sleeve and a medicine administration position close to the drive sleeve, the drive sleeve being driven to move when the button is in the medicine administration position; and a return spring arranged between the button and the drive sleeve, the button being normally arranged in the release position by the elastic force provided by the return spring.

[0010] In an embodiment, at least two first sliding grooves are arranged on the outer wall surface of the retreat prevention sleeve along the axial direction of the retreat prevention sleeve, and a first sliding block corresponding to the first sliding grooves is arranged on the inner wall surface of the drive sleeve.

[0011] In an embodiment, the connecting portion comprises a connecting sleeve, a partition and a threaded hole, one end of the connecting sleeve being sleeved in the pen barrel, the other end of the connecting sleeve being exposed outside the pen barrel, the partition being arranged in the connecting sleeve, and the threaded hole penetrating through the partition for screwing the helical push rod.

[0012] In an embodiment, the brake portion has a plurality of one-way teeth arranged on the inner wall surface of the connecting sleeve and engaged with the retreat prevention ratchet.

[0013] In an embodiment, the other end of the connecting sleeve away from the pen barrel is further provided with a medicine bottle sleeve for sleeving the medicine bottle.

[0014] In an embodiment, at least two second sliding grooves are arranged on the outer wall surface of the locking ratchet along the axial direction of the locking ratchet, and a second sliding block corresponding to the second sliding grooves is arranged on the inner wall surface of the dose sleeve.

[0015] In one embodiment, the drug delivery device further comprises a second helical track arranged on the outer periphery of the dose sleeve along the axial direction of the dose sleeve, and at least one protrusion arranged on the inner wall of the barrel and slidingly arranged in the second helical track.

[0016] In one embodiment, the knob comprises a rotating sleeve and a plurality of ratchet teeth arranged in the rotating sleeve, the ratchet teeth being engaged with the driving sleeve when the button is moved from the released position to the administration position.

[0017] In one embodiment, the button is partially arranged in the rotating sleeve.

[0018] In one embodiment, the outer wall of the helical push rod is provided with at least two third sliding grooves along the axial direction of the helical push rod, and the inner wall of the stop sleeve is provided with a third sliding block corresponding to each of the third sliding grooves.

[0019] Accordingly, the present application has at least the following features:

[0020] 1. The drug delivery device has a bidirectional adjustment function. When the dose knob is adjusted too much, the dose does not need to be reset by disassembling the cartridge. It can be directly adjusted to the required dose, which improves the errors and inconvenience in traditional operation.

[0021] 2. The hand pressure injection is more stable and intuitive.

[0022] 3. By adjusting the dose, the remaining dose of the medicine bottle is avoided.

[0023] 4. Simplify the composition of the transmission mechanism of the drug delivery device, and optimize the parts.

[0024] The specific techniques used in the present application will be further described through the following embodiments and accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a perspective assembly view of the preferred embodiment of the present application.

[0026] Fig. 2 is a perspective exploded view of the preferred embodiment of the present application.

[0027] Fig. 3 is a sectional view of Fig. 1.

[0028] Fig. 4 is a sectional view of Fig. 3 along the 4-4 sectional line.

[0029] Fig. 5 is a sectional view of Fig. 3 along the 5-5 sectional line.

[0030] Fig. 6 is a continuation of the action diagram of Fig. 3.

[0031] Fig. 7 is a continuation of the action diagram of Fig. 6.

[0032] In the figure: 100: pen barrel; 1001: first end; 1002: second end; 101: dose sleeve; 1011: second slider; 102: knob; 1021: rotating sleeve; 1022: ratchet; 103: drive sleeve; 1031: first slider; 104: helical track; 105: locking ratchet; 1051: second sliding groove; 106: connecting part; 1061: connecting sleeve; 1062: partition; 1063: threaded hole; 1064: medicine bottle sleeve; 107: retreat-stop ratchet; 108: brake part; 1081: one-way tooth; 109: retreat-stop sleeve; 1091: first sliding groove; 1092: third slider; 110: helical push rod; 1101: third sliding groove; 111: button; 112: return spring; 113: second helical track; 114: protrusion; 115: pen cap; 200: medicine bottle; 201: piston; 202: push rod washer. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] In this document, the terms "a" or "an" are used to describe elements and components of the present application. This is only done for convenience and to provide a general sense of the meaning of the words. Therefore, unless specifically stated otherwise, such description should be understood to include one or at least one, and the singular also includes the plural.

[0035] In this document, the terms "include", "have", or any other similar terms are intended to cover non-exclusive inclusion. For example, a component or structure containing multiple elements is not limited to only the elements listed herein, but can include other elements not explicitly listed but generally inherent to the component or structure.

[0036] First, please refer to FIGS. 1-5, which show a preferred embodiment of a medicine delivery device provided by the present application, which includes a pen barrel 100, a dose sleeve 101, a knob 102, a drive sleeve 103, a first helical track 104, a locking ratchet 105, a connecting part 106, a retreat-stop ratchet 107, a brake part 108, a retreat-stop sleeve 109, a helical push rod 110, a button 111, a return spring 112, a second helical track 113, at least one protrusion 114, and a pen cap 115.

[0037] The pen barrel 100 has a first end 1001 and a second end 1002 along its axial direction, and an observation window 1003 is formed on the pen barrel 100. The dose sleeve 101 is sleeved in the pen barrel 100.

[0038] The knob 102 is rotatably arranged on the first end 1001 of the pen barrel 100 and connected with the dose sleeve 101 to rotate synchronously. Further, the knob 102 comprises a rotating sleeve 1021 and a plurality of ratchet teeth 1022 arranged in the rotating sleeve 1021.

[0039] The drive sleeve 103 is sleeved in the dose sleeve 101, and the first helical track 104 is arranged on the outer periphery of the drive sleeve 103 along the axial direction of the drive sleeve 103.

[0040] The locking ratchet 105 is arranged in the dose sleeve 101 and is screwed on the drive sleeve 103 along the first helical track 104. Further, at least two second sliding grooves 1051 are arranged on the outer wall of the locking ratchet 105 along the axial direction of the locking ratchet 105, and the inner wall of the dose sleeve 101 is provided with a second sliding block 1011 corresponding to the second sliding groove 1051 for sliding in the second sliding groove 1051.

[0041] The connecting part 106 is arranged on the second end 1002 of the pen barrel 100 to connect a medicine bottle 200, which comprises a piston 201 and a push rod washer 202.

[0042] The retreat-stop ratchet 107 is arranged in the pen barrel 100, and further, the retreat-stop ratchet 107 is arranged in the connecting sleeve 1061.

[0043] The brake part 108 is arranged between the connecting part 106 and the retreat-stop ratchet 107 to limit the rotation of the retreat-stop ratchet 107. Further, the brake part 108 has a plurality of one-way teeth 1081 arranged on the inner wall of the connecting sleeve 1061 and engaged with the retreat-stop ratchet 107.

[0044] The retreat-stop sleeve 109 is sleeved in the drive sleeve 103, and one end of the retreat-stop sleeve 109 extends to the position of the second end 1002 of the pen barrel 100 and is connected with the retreat-stop ratchet 107. Further, at least two first sliding grooves 1091 are arranged on the outer wall of the retreat-stop sleeve 109 along the axial direction of the retreat-stop sleeve 109, and the inner wall of the drive sleeve 103 is provided with a first sliding block 1031 corresponding to the first sliding groove 1091 for sliding in the first sliding groove 1091.

[0045] One end of the screw push rod 110 penetrates the connecting part 106 and is exposed outside the pen barrel 100 to abut against the medicine bottle 200, and the other end of the screw push rod 110 penetrates the stopper ratchet wheel 107 and is arranged in the stopper sleeve 109. Further, the connecting part 106 comprises a connecting sleeve 1061, a partition 1062 and a screw hole 1063. One end of the connecting sleeve 1061 is arranged in the pen barrel 100, and the other end of the connecting sleeve 1061 is exposed outside the pen barrel 100 and is connected with a medicine bottle sleeve 1064 for sleeving the medicine bottle 200. The partition 1062 is arranged in the connecting sleeve 1061, and the screw hole 1063 penetrates the partition 1062 for screwing the screw push rod 110. Furthermore, at least two third sliding grooves 1101 are arranged on the outer wall surface of the screw push rod 110 along the axial direction of the screw push rod 110, and the inner wall surface of the stopper sleeve 109 is provided with a third sliding block 1092 corresponding to the third sliding grooves 1101 for sliding in the third sliding grooves 1101.

[0046] The button 111 is movably arranged on the first end 1001 of the pen barrel 100, and a part of the button 111 penetrates the rotating sleeve 1021 and can move between a release position away from the driving sleeve 103 and a dosing position close to the driving sleeve 103. When the button 111 is at the dosing position, the driving sleeve 103 is driven to move. The return spring 112 is arranged between the button 111 and the driving sleeve 103, and the elastic force provided by the return spring 112 makes the button 111 normally at the release position.

[0047] The second screw track 113 is arranged on the outer periphery of the dose sleeve 101 along the axial direction of the dose sleeve 101, and the protrusion 114 is arranged on the inner wall surface of the pen barrel 100 and slides in the second screw track 113.

[0048] The pen cover 115 is detachably connected with the connecting sleeve 1061 and contains the medicine bottle sleeve 1064 and the medicine bottle 200.

[0049] According to the above structure, the present application specifically uses an increasing dosing step, a decreasing dosing step and a dosing step, and the flow of each step is described as follows:

[0050] Firstly, as shown in FIG. 1 and FIG. 3, each component of the medicine delivery device is at the initial position.

[0051] Then, as shown in Fig. 6, when the dose adjustment step is performed, the rotating knob 102 is rotated clockwise to drive the dose sleeve 101 to rotate clockwise. Due to the linkage between the first slider 1031 and the first sliding groove 1091 (as shown in Fig. 4), the drive sleeve 103 is limited by the stopper ratchet 107 and cannot rotate, and can only move linearly reciprocatingly under the action of the rotating knob 102 and the reset spring 112. During the movement, the locking ratchet 105 rotates clockwise along the first spiral track 104 of the drive sleeve 103. When the medicine bottle 200 contains liquid, the piston 2002 will be blocked, and the rotation can be avoided.

[0052] Furthermore, when the dose adjustment step is performed, the rotating knob 102 is rotated counterclockwise to drive the dose sleeve 101 to rotate counterclockwise. Due to the linkage between the first slider 1031 and the first sliding groove 1091 (as shown in Fig. 4), the drive sleeve 103 is limited by the stopper ratchet 107 and cannot rotate, and can only move linearly reciprocatingly under the action of the rotating knob 102 and the reset spring 112. During the movement, the locking ratchet 105 rotates counterclockwise along the first spiral track 104 of the drive sleeve 103.

[0053] Finally, as shown in Fig. 7, when the dose adjustment step is performed, the button 111 is pressed to engage the ratchet 1022 with the drive sleeve 103, and during the pressing process, the dose sleeve 101 rotates counterclockwise, sequentially driving the drive sleeve 103, the stopper ratchet 107, and the spiral push rod 110 to rotate and move axially, thereby causing the spiral push rod 110 to press the medicine bottle 200 for injection. After the injection is completed, the button 111 is released, and the reset spring 112 is used to reset the button 111.

[0054] Accordingly, the present application can achieve the following effects:

[0055] 1. The medicine delivery device has a bidirectional adjustment function. When the dose knob is adjusted too much, it is not necessary to disassemble the cartridge and reset the dose. It can be directly adjusted to the required dose, which improves the errors and inconvenience in the traditional operation.

[0056] 2. The hand-pressing injection is more stable and intuitive.

[0057] 3. By adjusting the dose, it is avoided to exceed the remaining dose of the medicine bottle.

[0058] 4. The composition of the transmission mechanism of the medicine delivery device is simplified, and the components are optimized.

[0059] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A drug delivery device, characterized by, The medicine delivery device comprises: a pen barrel having a first end and a second end; a dose sleeve sleeved in the pen barrel; a knob rotatably arranged on the first end of the pen barrel and connected with the dose sleeve to rotate synchronously; a drive sleeve sleeved in the dose sleeve; a first helical track arranged on the outer periphery of the drive sleeve along the axial direction of the drive sleeve; a locking ratchet arranged in the dose sleeve and threaded on the drive sleeve along the first helical track; a connecting portion arranged on the second end of the pen barrel for connecting a medicine bottle; a retreat-stop ratchet arranged in the pen barrel; a brake portion arranged between the connecting portion and the retreat-stop ratchet to limit the rotation of the retreat-stop ratchet; a retreat-stop sleeve sleeved in the drive sleeve, and one end of the retreat-stop sleeve extending towards the position of the second end of the pen barrel and connected with the retreat-stop ratchet; a helical push rod, one end of which penetrates through the connecting portion and is exposed outside the pen barrel for abutting against the medicine bottle, and the other end of which penetrates through the retreat-stop ratchet and is arranged in the retreat-stop sleeve; a button movably arranged on the first end of the pen barrel and movable between a release position away from the drive sleeve and a medicine delivery position close to the drive sleeve, and the button driving the drive sleeve to move when the button is arranged at the medicine delivery position; and a return spring arranged between the button and the drive sleeve, and the button being normally arranged at the release position by the elastic force provided by the return spring. The outer wall surface of the retreat-stop sleeve is provided with at least two first sliding grooves along the axial direction of the retreat-stop sleeve, and the inner wall surface of the drive sleeve is respectively provided with a first sliding block corresponding to the first sliding grooves for sliding in the first sliding grooves.

2. The drug delivery device of claim 1, wherein, The connecting portion comprises a connecting sleeve, a partition and a threaded hole, one end of the connecting sleeve is sleeved in the pen barrel, the other end of the connecting sleeve is exposed outside the pen barrel, the partition is arranged in the connecting sleeve, and the threaded hole penetrates through the partition for the helical push rod to threadedly penetrate.

3. The drug delivery device of claim 1, wherein, The brake portion has a plurality of one-way teeth arranged on the inner wall surface of the connecting sleeve and engaged with the retreat-stop ratchet.

4. The drug delivery device of claim 3, wherein, The other end of the connecting sleeve away from the pen barrel is further provided with a medicine bottle sleeve for sleeving the medicine bottle.

5. The drug delivery device of claim 3, wherein, The outer wall surface of the locking ratchet is provided with at least two second sliding grooves along the axial direction of the locking ratchet, and the inner wall surface of the dose sleeve is respectively provided with a second sliding block corresponding to the second sliding grooves for sliding in the second sliding grooves.

6. The drug delivery device of claim 1, wherein, The medicine delivery device further comprises a second helical track arranged on the outer periphery of the dose sleeve along the axial direction of the dose sleeve and at least one protrusion arranged on the inner wall surface of the pen barrel and sliding in the second helical track.

7. The drug delivery device of claim 1, wherein, ​ 8. The drug delivery device of claim 1, wherein, The knob comprises a rotating sleeve and a plurality of ratchet teeth arranged in the rotating sleeve, and the ratchet teeth are engaged with the driving sleeve when the button is moved from the release position to the administration position.

9. The drug delivery device of claim 8, wherein, Part of the button is arranged in the rotating sleeve.

10. The drug delivery device of claim 1, wherein, At least two third sliding grooves are arranged on the outer wall of the screw push rod along the axial direction of the screw push rod, and the inner wall of the retreat-preventing sleeve is provided with a third sliding block corresponding to each of the third sliding grooves.

Images