Drug delivery device

Abstract

The drug delivery device comprises a pen container; a dose sleeve; the knob is rotatably arranged at the first end of the pen container and is connected with the dosage sleeve to synchronously rotate with the dosage sleeve; the driving sleeve is arranged in the dosage sleeve in a sleeving manner; the first spiral track is arranged on the outer periphery of the driving sleeve; the connecting part is arranged at the second end of the pen container and used for being connected with a medicine bottle; the retaining ratchet wheel is positioned in the pen container; the braking part is arranged between the connecting part and the retaining ratchet wheel, so that the retaining ratchet wheel is limited in rotation; the retaining sleeve is arranged in the driving sleeve in a sleeving manner and is connected with the retaining ratchet wheel; the spiral push rod penetrates through the connecting part, is exposed out of the pen container and is used for abutting against the medicine bottle, and the other end of the spiral push rod penetrates through the retaining ratchet wheel and is arranged in the retaining sleeve in a penetrating mode. The button is arranged at the first end of the pen container and moves between a releasing position and a medicine feeding position, and when the button is located at the medicine feeding position, the driving sleeve is driven to move; the reset spring is arranged between the button and the driving sleeve and provides elastic force to enable the button to be normally located at the release position.

Description

Technical Field

[0001] The utility model relates to the technical field of medical injection, and more specifically, the utility model relates to a drug delivery device. Background Art

[0002] An injection device is a commonly used medical device, which is a device for injecting drugs subcutaneously, aiming to make the injection of drugs easier and more convenient to use, thereby improving patient compliance.

[0003] However, traditional injection devices usually consist of multiple parts, including a housing, a dose setting knob, a transmission mechanism, other detailed components, etc. For example, the drug injection pen with the Chinese patent publication number CN204337431U includes a housing and a dose setting knob that can rotate relative to the housing. A braking assembly is arranged in the housing and has a ratchet member, and the driver includes at least one external tooth.

[0004] Although the drug syringe of the prior art provides simple assembly that can be easily customized, the prior art sets the ratchet at the knob position. Therefore, the knob of the existing patent can only rotate in one direction, resulting in the drug syringe can only increase the dose and cannot decrease it. If the adjusted dose exceeds the predetermined amount, it is irreversible and only the drug can be given out with an empty syringe, causing waste of drugs.

[0005] Moreover, the injection devices of the prior art also have problems such as complex component composition, poor transmission, and unstable operation, 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. Summary of the Utility Model

[0006] In order to overcome the deficiencies of the prior art, the main purpose of the present utility model is to provide a drug delivery device, which optimizes the design of the overall structure, simplifies its parts, reduces the transmission relationship, and is more stable in operation.

[0007] Another purpose of the present utility model is to provide a drug delivery device that adjusts the injection dosage by using a knob, which has small torque and is more convenient to operate.

[0008] To achieve the above object, the drug delivery device provided by the present utility model includes: a pen barrel having a first end and a second end; a dose sleeve sleeved in the pen barrel; a knob rotatably provided on the first end of the pen barrel and connected to the dose sleeve so as to rotate synchronously; a drive sleeve sleeved in the dose sleeve; a first spiral track wound around the outer periphery of the drive sleeve along the axial direction of the drive sleeve; a locking ratchet located in the dose sleeve and screwed on the drive sleeve along the first spiral track; a connecting portion provided on the second end of the pen barrel for connecting a medicine bottle; a backstop ratchet located in the pen barrel; a braking portion provided between the connecting portion and the backstop ratchet to limit the rotation of the backstop ratchet by the braking portion; a backstop sleeve sleeved in the drive sleeve, and one end of the backstop sleeve extends towards the position of the second end of the pen barrel and is connected to the backstop ratchet; a screw 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 the screw push rod penetrates through the backstop ratchet and is arranged in the backstop sleeve; a button movably provided on the first end of the pen barrel and moving between a release position away from the drive sleeve and a drug delivery position close to the drive sleeve, and when the button is in the drug delivery position, it drives the drive sleeve to displace; a return spring provided between the button and the drive sleeve, and due to the elastic force provided by the return spring, the button is normally in the release position.

[0009] In one embodiment, at least two first sliding grooves are provided on the outer wall surface of the backstop sleeve along the axial direction of the backstop sleeve, and a first sliding block for sliding in the first sliding groove is respectively provided on the inner wall surface of the drive sleeve corresponding to the first sliding groove.

[0010] In one embodiment, the connecting portion includes a connecting sleeve, a partition portion and a screwing hole. One end of the connecting sleeve is sleeved in the pen barrel, and the other end of the connecting sleeve is exposed outside the pen barrel. The partition portion is arranged in the connecting sleeve, and the screwing hole penetrates through the partition portion for the screw push rod to be screwed and passed through.

[0011] In one embodiment, the braking portion has a plurality of one-way teeth, which are spaced apart from each other and arranged on the inner wall surface of the connecting sleeve and mesh with the backstop ratchet.

[0012] In one embodiment, a medicine bottle sleeve is further provided at the other end of the connecting sleeve away from the pen barrel for the medicine bottle to be sleeved.

[0013] In one embodiment, at least two second sliding grooves are provided on the outer wall surface of the locking ratchet along the axial direction of the locking ratchet, and a second sliding block for sliding in the second sliding groove is respectively provided on the inner wall surface of the dose sleeve corresponding to the second sliding groove.

[0014] In one embodiment, the drug delivery device further includes a second helical track and at least one protrusion. The second helical track is wound around the outer periphery of the dose sleeve along the axial direction of the dose sleeve, and the protrusion is provided on the inner wall surface of the pen barrel and slidably arranged in the second helical track.

[0015] In one embodiment, the knob includes a rotating sleeve and a plurality of ratchet teeth arranged in the rotating sleeve. When the button position moves from the release position towards the drug delivery position, the ratchet teeth are engaged with the driving sleeve.

[0016] In one embodiment, a part of the button penetrates through the rotating sleeve.

[0017] In one embodiment, at least two third chutes are arranged on the outer wall surface of the screw push rod along the axial direction of the screw push rod, and a third slider for sliding in the third chute is respectively arranged on the inner wall surface of the anti-retreat sleeve corresponding to the third chute.

[0018] Accordingly, the present utility model at least has the following characteristics:

[0019] 1. The drug delivery device has a two-way adjustment function. When the dose knob is turned too far, there is no need to disassemble and reinstall the pen refill to reset the dose. Just directly turn it back to the required dose, which improves the errors and inconveniences in traditional operations.

[0020] 2. Hand-pressed injection is more stable and intuitive.

[0021] 3. By adjusting the dose, it is possible to avoid exceeding the remaining dose in the medicine bottle.

[0022] 4. Simplify the composition of the transmission mechanism of the drug delivery device and optimize the components.

[0023] The specific technology adopted by the present utility model will be further described through the following embodiments and the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic perspective combined view of a preferred embodiment of the present utility model.

[0025] Figure 2 is a schematic perspective exploded view of a preferred embodiment of the present utility model.

[0026] Figure 3 is Figure 1 a cross-sectional view.

[0027] Figure 4 is Figure 3 a cross-sectional view taken along the section line 4-4.

[0028] Figure 5 is Figure 3 a cross-sectional view taken along the section line 5-5.

[0029] Figure 6 For connection Figure 3 of the actuation diagram.

[0030] Figure 7 For connection Figure 6 of the actuation diagram.

[0031] In the figure: 100: pen holder; 1001: first end; 1002: second end; 101: dose sleeve; 1011: second slider; 102: knob; 1021: rotating sleeve; 1022: ratchet teeth; 103: drive sleeve; 1031: first slider; 104: spiral track; 105: locking ratchet; 1051: second chute; 106: connecting part; 1061: connecting sleeve; 1062: partition; 1063: screw hole; 1064: medicine bottle sleeve; 107: anti - reverse ratchet; 108: braking part; 1081: one - way teeth; 109: anti - reverse sleeve; 1091: first chute; 1092: third slider; 110: spiral push rod; 1101: third chute; 111: button; 112: return spring; 113: second spiral track; 114: protrusion; 115: pen cap; 200: medicine bottle; 201: piston; 202: push rod washer. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0033] In this article, "a" or "an" is used to describe the components and assemblies described herein. This is only for convenience of description and provides a general meaning to the scope of the present utility model. Therefore, unless clearly indicated otherwise, such description should be understood to include one or at least one, and the singular also includes the plural.

[0034] In this article, the term "comprising", "having" or any other similar term is intended to cover non - exclusive inclusion. For example, a component or structure containing multiple elements is not limited to only these elements listed herein, but may include other elements that are usually inherent to the component or structure but not explicitly listed.

[0035] First, please refer to Figures 1 to 5, a drug delivery device provided by a preferred embodiment of the present invention, which includes a pen barrel 100, a dose sleeve 101, a knob 102, a drive sleeve 103, a first spiral track 104, a locking ratchet 105, a connecting portion 106, a backstop ratchet 107, a braking portion 108, a backstop sleeve 109, a spiral push rod 110, a button 111, a return spring 112, a second spiral track 113, at least one protrusion 114, and a pen cap 115.

[0036] The two ends of the pen barrel 100 along its axis are respectively a first end 1001 and a second end 1002, and an observation window 1003 is provided. The dose sleeve 101 is sleeved inside the pen barrel 100.

[0037] The knob 102 is rotatably provided on the first end 1001 of the pen barrel 100 and is connected to the dose sleeve 101 so as to be rotatable synchronously. Further, the knob 102 includes a rotating sleeve 1021 and a plurality of ratchet teeth 1022 provided inside the rotating sleeve 1021.

[0038] The drive sleeve 103 is sleeved inside the dose sleeve 101, and the first spiral track 104 is wound around the outer periphery of the drive sleeve 103 along the axis of the drive sleeve 103.

[0039] The locking ratchet 105 is located in the dose sleeve 101 and is screwed on the drive sleeve 103 along the first spiral track 104. Further, at least two second sliding grooves 1051 are provided on the outer wall surface of the locking ratchet 105 along the axis of the locking ratchet 105, and a second slider 1011 for sliding in the second sliding groove 1051 is respectively provided on the inner wall surface of the dose sleeve 101 corresponding to the second sliding groove 1051.

[0040] The connecting portion 106 is provided on the second end 1002 of the pen barrel 100 for connecting a medicine bottle 200. The medicine bottle 200 includes a piston 201 and a push rod washer 202.

[0041] The backstop ratchet 107 is located inside the pen barrel 100. Further, the backstop ratchet 107 is specifically located inside the connecting sleeve 1061.

[0042] The braking portion 108 is provided between the connecting portion 106 and the backstop ratchet 107 to limit the rotation of the backstop ratchet 107 by the braking portion 108. Further, the braking portion 108 has a plurality of one-way teeth 1081, which are provided on the inner wall surface of the connecting sleeve 1061 at intervals and mesh with the backstop ratchet 107.

[0043] The anti-retreat sleeve 109 is sleeved inside the driving sleeve 103, and one end of the anti-retreat sleeve 109 extends towards the position of the second end 1002 of the pen barrel 100 and is connected to the anti-retreat ratchet 107. Further, at least two first sliding grooves 1091 are provided on the outer wall surface of the anti-retreat sleeve 109 along the axial direction of the anti-retreat sleeve 109, and a first sliding block 1031 for sliding in the first sliding groove 1091 is respectively provided on the inner wall surface of the driving sleeve 103 corresponding to the first sliding groove 1091.

[0044] One end of the screw push rod 110 penetrates through the connecting part 106 and is exposed outside the pen barrel 100 for abutting against the medicine bottle 200, and the other end of the screw push rod 110 penetrates through the anti-retreat ratchet 107 and is arranged inside the anti-retreat sleeve 109. Further, the connecting part 106 includes a connecting sleeve 1061, a partition part 1062 and a screw connection hole 1063. One end of the connecting sleeve 1061 is sleeved inside 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 the medicine bottle 200 to be sleeved. The partition part 1062 is arranged inside the connecting sleeve 1061, and the screw connection hole 1063 penetrates through the partition part 1062 for the screw push rod 110 to be screwed and arranged. Moreover, at least two third sliding grooves 1101 are provided on the outer wall surface of the screw push rod 110 along the axial direction of the screw push rod 110, and a third sliding block 1092 for sliding in the third sliding groove 1101 is respectively provided on the inner wall surface of the anti-retreat sleeve 109 corresponding to the third sliding groove 1101.

[0045] The button 111 is movably arranged on the first end 1001 of the pen barrel 100, and a part of the button 111 is arranged inside the rotating sleeve 1021 and can move between a release position far from the driving sleeve 103 and a medicine administration position close to the driving sleeve 103. When the button 111 is at the medicine administration position, it drives the driving sleeve 103 to displace. The return spring 112 is arranged between the button 111 and the driving sleeve 103, and due to the elastic force provided by the return spring 112, the button 111 is normally at the release position.

[0046] The second spiral track 113 is wound around the outer peripheral edge of the dose sleeve 101 along the axial direction of the dose sleeve 101, the protrusion 114 is arranged on the inner wall surface of the pen barrel 100 and slides in the second spiral track 113.

[0047] The pen cap 115 is detachably connected to the connecting sleeve 1061 and houses the medicine bottle sleeve 1064 and the medicine bottle 200 therein.

[0048] According to the above structural description, the specific use of the present utility model has a step of increasing the dosage, a step of decreasing the dosage and a step of administering medicine, and the flow of each step is described as follows:

[0049] First, as Figure 1 andFigure 3 As shown, the components included in the drug delivery device are in the initial position.

[0050] Next, as Figure 6 shown, when performing the step of increasing the dosage, rotate the knob 102 clockwise to drive the dosage sleeve 101 to rotate clockwise. Due to the interlocking relationship between the first slider 1031 and the first chute 1091 (as Figure 4 shown), the drive sleeve 103 is restricted by the ratchet 107 and cannot rotate accordingly. Instead, it can only perform linear reciprocating motion under the action of the knob 102 and the return spring 112. During the movement, the locking ratchet 105 will rotate clockwise along the first spiral track 104. Among them, when there is liquid medicine in the medicine bottle 200, the piston 2002 will be subject to resistance, which can avoid idling.

[0051] Furthermore, when performing the step of decreasing the dosage, rotate the knob 102 counterclockwise to drive the dosage sleeve 101 to rotate counterclockwise. Due to the interlocking relationship between the first slider 1031 and the first chute 1091 (as Figure 4 shown), the drive sleeve 103 is restricted by the ratchet 107 and cannot rotate accordingly. Instead, it can only perform linear reciprocating motion under the action of the knob 102 and the return spring 112. During the movement, the locking ratchet 1059 will rotate counterclockwise along the first spiral track 104 of the drive sleeve 103.

[0052] Finally, as Figure 7 shown, when performing the drug delivery step, press the button 111 so that the ratchet teeth 1022 engage with the drive sleeve 103. During the pressing process, the dosage sleeve 101 rotates counterclockwise, sequentially driving the drive sleeve 103, the ratchet 107, and driving the spiral push rod 110 to perform rotational axial movement. As a result, the spiral push rod 110 squeezes the medicine bottle 200 for injection. After the injection is completed, release the button 111 by hand, and use the return spring 112 to reset the button 111.

[0053] Accordingly, the utility model can achieve the following effects:

[0054] 1. The drug delivery device has a two-way adjustment function. When the dosage knob is turned too far, there is no need to disassemble and reinstall the refill to reset the dosage. Instead, it is only necessary to directly adjust it back to the required dosage, improving the errors and inconveniences in traditional operations.

[0055] 2. Hand-pressed injection is more stable and intuitive.

[0056] 3. By adjusting the dosage, exceeding the remaining dosage in the medicine bottle can be avoided.

[0057] 4. Simplify the composition of the transmission mechanism of the drug delivery device and optimize the components.

[0058] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A drug delivery device, characterized in that: The drug delivery device comprises: A pen holder having a first end and a second end; A dosage sleeve, sleeved in the pen barrel; a knob rotatably disposed on the first end of the pen barrel and connected to the dosage sleeve so as to be synchronously rotatable; a drive sleeve, sleeved in the dosage sleeve; a first spiral track, arranged along the axial direction of the drive sleeve and around the outer periphery of the drive sleeve; a locking ratchet, located in the dosage sleeve and screwed onto the drive sleeve along the first spiral track; A connecting portion, disposed on the second end of the pen barrel, for connecting to a medicine bottle; A ratchet wheel, located in the pen barrel; a brake portion, disposed between the connecting portion and the stop ratchet, so that the rotation of the stop ratchet is restricted by the brake portion; a backstop sleeve, which is sleeved in the driving sleeve, and one end of the backstop sleeve extends toward the location of the second end of the pen holder and is connected to the backstop ratchet; a spiral push rod, one end of which passes through the connecting portion and is exposed outside the pen barrel to push against the medicine bottle, and the other end of the spiral push rod passes through the anti-retraction ratchet and is inserted into the anti-retraction sleeve; a button, movably disposed on the first end of the pen barrel and movable between a release position away from the drive sleeve and a drug delivery position close to the drive sleeve, and when the button is located at the drug delivery position, the drive sleeve is driven to move; as well as A return spring is arranged between the button and the driving sleeve. The button is normally located at the release position through the elastic force provided by the return spring.

2. The drug delivery device according to claim 1, characterized in that: At least two first sliding grooves are provided on the outer wall surface of the stop sleeve along the axial direction of the stop sleeve, and a first sliding block for sliding in the first sliding groove is provided on the inner wall surface of the driving sleeve corresponding to the first sliding grooves.

3. The drug delivery device according to claim 1, characterized in that: The connecting part includes a connecting sleeve, a partition and a screw hole, one end of the connecting sleeve is sleeved in the pen barrel, and the other end of the connecting sleeve is exposed outside the pen barrel, the partition is arranged in the connecting sleeve, and the screw hole passes through the partition for the screw push rod to be screwed through.

4. The drug delivery device according to claim 3, characterized in that: The braking part has a plurality of one-way teeth which are arranged on the inner wall surface of the connecting sleeve and are spaced apart from each other and meshed with the stop ratchet.

5. The drug delivery device according to claim 3, characterized in that: A medicine bottle sleeve is also provided at the other end of the connecting sleeve away from the pen holder for the medicine bottle to be sleeved.

6. The drug delivery device according to claim 1, characterized in that At least two second sliding grooves are provided on the outer wall surface of the locking ratchet along the axial direction of the locking ratchet, and a second sliding block slidably arranged in the second sliding groove is provided on the inner wall surface of the dosage sleeve corresponding to the second sliding groove.

7. The drug delivery device according to claim 1, characterized in that: The drug delivery device further comprises a second spiral track and at least one protrusion, wherein the second spiral track is arranged around the outer periphery of the dose sleeve along the axial direction of the dose sleeve, and the protrusion is arranged on the inner wall surface of the pen barrel and slidably arranged in the second spiral track.

8. The drug delivery device according to claim 1, characterized in that The knob comprises a rotating sleeve and a plurality of ratchets arranged in the rotating sleeve. When the button moves from the release position to the medication position, the ratchets are engaged with the driving sleeve.

9. The drug delivery device according to claim 8, characterized in that Part of the button is inserted into the rotating sleeve.

10. The drug delivery device according to claim 1, characterized in that At least two third sliding grooves are provided on the outer wall surface of the screw push rod along the axial direction of the screw push rod, and a third sliding block for sliding in the third sliding groove is provided on the inner wall surface of the stop sleeve corresponding to the third sliding groove.

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