Drug delivery device

Abstract

A drug delivery device, comprising a pen cap (1). A drug administration mechanism (101) is provided on the right side surface of the pen cap (1); a dose adjustment mechanism (201) is provided on the right end surface of the drug administration mechanism (101); the drug administration mechanism (101) comprises a drug administration portion and a connecting portion; the side surface of the drug administration portion is connected to the side surface of the connecting portion; the connecting portion comprises a pen holder (14); the left side surface of the pen holder (14) is in through connection with the right side surface of the pen cap (1); the dose adjustment mechanism (201) comprises a dose adjustment portion and an observation portion; the side surface of the dose adjustment portion is connected to the side surface of the observation portion; the dose adjustment portion comprises a knob (16); and the left end surface of the knob (16) is connected to the right side surface of the pen holder (14). The drug delivery device is provided with the dose adjustment mechanism (201), the knob (16) and a scale sleeve (13), such that dose adjustment can be performed in a reciprocating manner, thereby avoiding drug waste; and a button (8) does not displace in the dose adjustment process, such that the injection is convenient, the product transmission mechanism is simplified, and parts are optimized.

Description

Drug delivery devices Technical Field

[0001] The present invention relates to the technical field of drug delivery, and in particular to a drug delivery device. Background Art

[0002] An injection pen, also known as a medication pen, is a device used to inject medication under the skin. It is designed to make injectable medication easier and more convenient to use, thereby improving patient compliance.

[0003] A Chinese patent application, publication number CN204337431U, discloses a drug injection pen comprising a housing and a dose setting knob rotatable relative to the housing. A brake assembly is disposed within the housing and includes a ratchet component. A driver includes at least one external tooth.

[0004] However, the following disadvantages still exist: although the drug injection pen provides a simple assembly that can be easily customized by using the drug syringe of the above-mentioned prior art, the prior art sets the ratchet at the knob position, so the knob of the existing patent can only be rotated in one direction, resulting in the drug syringe being able to only increase the amount but not decrease the amount. If the adjusted dose exceeds the predetermined amount, it is irreversible and the drug can only be administered with an empty needle, resulting in drug waste.

[0005] Therefore, the present invention designs a drug delivery device to solve the above-mentioned long-standing technical problems in the prior art.

[0006] Summary of the Invention

[0007] The object of the present invention is to provide a drug delivery device to solve the technical problems raised in the above background technology.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a drug delivery device includes a pen cap, a drug delivery mechanism is provided on the right side of the pen cap, a dosage adjustment mechanism is provided on the right end surface of the drug delivery mechanism, a ratchet sleeve is provided on the inner wall of the right end of the pen cap, and a driving ratchet is provided on the inner wall of the ratchet sleeve;

[0009] The drug delivery mechanism further includes a drug delivery portion and a connecting portion, wherein a side surface of the drug delivery portion is connected to a side surface of the connecting portion;

[0010] The connecting part includes a pen barrel, the left side of the pen barrel and the right side of the pen cap are connected through a ratchet sleeve, a driving rod is provided inside the pen barrel, a push rod is further provided inside the driving rod, a side surface of the push rod is slidably connected to the inner wall of the driving rod, and a side surface of the push rod is connected to a side surface of the driving ratchet;

[0011] The amount adjustment mechanism includes an amount adjustment portion and an observation portion, wherein a side surface of the amount adjustment portion is connected to a side surface of the observation portion; and

[0012] The volume adjustment part also includes a knob, and the left end surface of the knob is connected to the right side surface of the pen holder.

[0013] Preferably, a button is provided on the right end face of the knob, and the left end face of the button extends through the knob to the inside of the drive rod. The side face of the button is slidingly connected to the inner wall of the knob, and the side face of the button is in sealing contact with the inner wall of the knob, so that the button can be directly pressed to deliver the drug.

[0014] Preferably, a reset spring is sleeved on the surface of the driving rod, and the left end surface of the button is in sealing and extruding contact with the inner wall of the driving rod. The reset spring allows the button to be reset in time after being pressed.

[0015] Preferably, a locking ring is provided on the inner wall of the right end of the pen barrel, the side surface of the driving rod is slidingly connected to the inner wall of the locking ring, the right end surface of the return spring is connected to the inner wall of the locking ring, and the locking ring can fix the position of the knob.

[0016] Preferably, a power spring is sleeved on the left end surface of the driving rod, the left end surface of the power spring is connected to the right end surface of the ratchet sleeve, a scale sleeve is provided inside the pen body, the right end surface of the power spring is connected to the inner wall of the scale sleeve, the side surface of the scale sleeve is slidably connected to the inner wall of the pen body, and the scale sleeve allows the operator to observe the output measurement.

[0017] Preferably, a medicine box is provided on the inner wall of the pen cap, a cartridge is provided on the inner wall of the medicine box, the inner wall of the medicine box and the surface of the cartridge are slidably connected, and medicine is placed inside the medicine box.

[0018] Preferably, a cartridge stopper is provided on the inner wall of the right end of the cartridge, a push rod washer is provided on the right side of the cartridge stopper, the left end face of the push rod is in squeeze contact with the right side of the cartridge stopper, and the push rod washer enables the push rod to initiate the effect of lateral linear movement.

[0019] Preferably, a holder is provided on the top surface of the pen cap to facilitate placement of the pen cap.

[0020] Compared with the prior art, the beneficial effects of the present invention are: the drug delivery device is provided with a dosage adjustment mechanism, and the knob and the scale sleeve work together to make reciprocating adjustment when adjusting the dosage, making the adjustment more precise and avoiding drug waste. The button does not move during the dosage adjustment process, making injection convenient, simplifying the product transmission mechanism, and optimizing components.

[0021] Specifically, the present invention utilizes a drive ratchet, ratchet sleeve, and push rod that work together to achieve a linear force on the stopper, eliminating the influence of external forces in other directions, allowing the stopper to maintain a balanced state that could lead to errors in the injection dosage. Furthermore, the provision of a dosing mechanism reduces force decomposition and frictional resistance compared to traditional rotational linear motion. When only linear motion is generated, the push rod and push rod washer do not experience relative displacement or rotation with the cartridge stopper, thus avoiding inaccurate injection metering caused by deformation or offset during the extrusion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a perspective schematic diagram of the present invention.

[0023] FIG2 is a schematic cross-sectional view of the present invention.

[0024] FIG3 is a three-dimensional enlarged schematic diagram of area A in FIG2 .

[0025] FIG4 is a three-dimensional enlarged schematic diagram of area B in FIG2 .

[0026] FIG5 is a three-dimensional enlarged schematic diagram of area C in FIG2 .

[0027] FIG6 is a cross-sectional schematic diagram of another working state of the present invention.

[0028] In the figure: 1 pen cap, 2 medicine box, 3 cartridge, 4 cartridge stopper, 5 power spring, 6 driving rod, 7 return spring, 8 button, 9 push rod washer, 10 driving ratchet, 11 ratchet sleeve, 12 push rod, 13 scale sleeve, 14 pen barrel, 15 locking ring, 16 knob, 17 sleeve frame, 101 dosing mechanism, 201 volume adjustment mechanism. DETAILED DESCRIPTION

[0029] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1

[0031] Referring to Figures 1 to 6, the present invention provides a technical solution: a drug delivery device includes a pen cap 1, a dosing mechanism 101 is provided on the right side of the pen cap 1, and a dosage adjustment mechanism 201 is provided on the right end face of the dosing mechanism 101; the dosing mechanism 101 also includes a dosing portion and a connecting portion, and the side face of the dosing portion is connected to the side face of the connecting portion; the connecting portion includes a pen body 14, and the left side face of the pen body 14 is connected to the right side face of the pen cap 1.

[0032] The right end face of the knob 16 is provided with a button 8, and the left end face of the button 8 extends through the knob 16 to the interior of the driving rod 6. The side surface of the button 8 is slidingly connected to the inner wall of the knob 16, and the side surface of the button 8 is in sealing contact with the inner wall of the knob 16. The inside of the pen body 14 is provided with a driving rod 6, and the surface of the driving rod 6 is sleeved with a return spring 7. The left end surface of the button 8 is in sealing and extruding contact with the inner wall of the driving rod 6.

[0033] The left end surface of the driving rod 6 is sleeved with a power spring 5, the left end surface of the power spring 5 is connected to the right end surface of the ratchet sleeve 11, a scale sleeve 13 is provided inside the pen body 14, the right end surface of the power spring 5 is connected to the inner wall of the scale sleeve 13, and the side surface of the scale sleeve 13 is slidably connected to the inner wall of the pen body 14.

[0034] Furthermore, by providing the dosing mechanism 101, the non-rotating linear motion reduces the force decomposition and the resistance caused by friction compared to the traditional rotary linear motion. When only linear motion is generated, the push rod 12 and the push rod washer 9 do not produce relative displacement and rotation with the cartridge stopper 4, thereby avoiding inaccurate injection measurement caused by deformation or offset during the extrusion process.

[0035] Example 2

[0036] Please continue to refer to Figures 1 to 6. Based on the first embodiment: the adjustment mechanism 201 also includes an adjustment part and an observation part, and the side of the adjustment part is connected to the side of the observation part; the adjustment part includes a knob 16, and the left end face of the knob 16 is connected to the right side face of the pen barrel 14. A push rod 12 is provided inside the driving rod 6, and the side face of the push rod 12 is slidably connected to the inner wall of the driving rod 6.

[0037] A medicine box 2 is provided on the inner wall of the pen cap 1, and a cartridge 3 is provided on the inner wall of the medicine box 2. The inner wall of the medicine box 2 and the surface of the cartridge 3 are slidingly connected. A cartridge stopper 4 is provided on the inner wall of the right end of the cartridge 3. A push rod washer 9 is provided on the right side of the cartridge stopper 4. The left end face of the push rod 12 is in extrusion contact with the right side face of the cartridge stopper 4.

[0038] A ratchet sleeve 11 is provided on the inner wall of the right end of the pen cap 1. The left side of the pen body 14 and the right side of the pen cap 1 are connected through the ratchet sleeve 11. The inner wall of the ratchet sleeve 11 is provided with a driving ratchet 10. The side of the push rod 12 is connected to the side of the driving ratchet 10. A sleeve 17 is provided on the top surface of the pen cap 1. A locking ring 15 is provided on the inner wall of the right end of the pen body 14. The side of the driving rod 6 is slidably connected to the inner wall of the locking ring 15. The right end surface of the return spring 7 is connected to the inner wall of the locking ring 15.

[0039] The medicine in the cartridge 3 can be injected all at once or divided into multiple injections. After the medicine is injected, it is discarded and no new cartridge 3 is replaced. After the injection is completed, if there is another injection, the user only needs to remove the needle and replace it with a new needle when the next injection is to be made.

[0040] Furthermore, the drug delivery device of the present invention is provided with a dosage adjustment mechanism 201, and the knob 16 and the scale sleeve 13 work together to enable reciprocating adjustment when adjusting the dosage, making the adjustment of the drug dosage more accurate and avoiding drug waste. The button does not move during the process of adjusting the dosage, making injection convenient, simplifying the product transmission mechanism, and optimizing components.

[0041] Furthermore, by providing the driving ratchet 10 and the ratchet sleeve 11 to cooperate with each other, the push rod 12 only generates linear motion, but not rotational motion, so that the force applied to the cartridge stopper 4 is linear and is not affected by external forces in other directions. This effectively improves the defect of the push rod in the prior art that the push rod generates both linear and rotational motions, allowing the cartridge stopper 4 to maintain a balanced state and avoiding excessive errors in the injection dosage.

[0042] During use, the user can rotate the knob 16 clockwise to drive the drive rod 6 to rotate, causing the scale sleeve 13 to rotate to the right, thereby compressing the power spring 5. After adjusting to the required drug dosage, the user releases the knob 16 and limits it in place through the locking ring 15.

[0043] When the drug dosage needs to be reduced, the knob 16 is rotated counterclockwise, thereby rotating the drive rod 6, causing the scale sleeve 13 to rotate to the left, thereby causing the power spring 5 to rebound. It is particularly noted that the power spring 5 of the present invention can be a compression spring, an extension spring, or a torsion spring. Those skilled in the art can select the most appropriate spring type based on actual design requirements, and the spring type of the present invention is not limited thereto.

[0044] After adjusting to the required drug dosage, release the knob 16 and limit it by the locking ring 15 to adjust the drug dosage to the required precise amount. Press the button 8 to release the drive rod 6 from the control of the knob 16, thereby compressing the return spring 7. The rod pin of the drive rod 6 enters the inside of the drive ratchet 10. The compressed power spring 5 rebounds and drives the scale sleeve to rotate counterclockwise, so that the drive rod 6 drives the drive ratchet 10 to move the push rod 12 to the left, squeezing the cartridge stopper 4 through the push rod washer 9 to carry out the drug administration.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention 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 cap (1), wherein a dosing mechanism (101) is fixedly arranged on the right side surface of the pen cap (1), a dosage adjustment mechanism (201) is fixedly arranged on the right end surface of the dosing mechanism (101), a ratchet sleeve (11) is arranged on the inner wall of the right end of the pen cap (1), and a driving ratchet (10) is arranged on the inner wall of the ratchet sleeve (11); The drug delivery mechanism (101) further comprises a drug delivery portion and a connecting portion, wherein a side surface of the drug delivery portion is connected to a side surface of the connecting portion; The connecting portion further comprises a pen holder (14), the left side of the pen holder (14) and the right side of the pen cap (1) are connected through the ratchet sleeve (11), a driving rod (6) is arranged inside the pen holder (14), a push rod (12) is also arranged inside the driving rod (6), the side surface of the push rod (12) is slidably connected to the inner wall of the driving rod (6), and the side surface of the push rod (12) is connected to the side surface of the driving ratchet (10); The amount adjustment mechanism (201) further comprises an amount adjustment portion and an observation portion, wherein a side surface of the amount adjustment portion is connected to a side surface of the observation portion; and The volume adjustment portion also includes a knob (16), and the left end surface of the knob (16) is connected to the right end surface of the pen holder (14).

2. The drug delivery device according to claim 1, characterized in that: A button (8) is provided on the right end surface of the knob (16); a left end surface of the button (8) penetrates the knob (16) and extends to the inside of the driving rod (6); a side surface of the button (8) is slidably connected to an inner wall of the knob (16); and the side surface of the button (8) is in sealing contact with the inner wall of the knob (16).

3. The drug delivery device according to claim 2, characterized in that: A reset spring (7) is fixedly sleeved on the surface of the driving rod (6), and the left end surface of the button (8) is in sealing and extruding contact with the inner wall of the driving rod (6).

4. The drug delivery device according to claim 3, characterized in that: A locking ring (15) is provided on the inner wall of the right end of the pen shaft (14), the side surface of the driving rod (6) is slidably connected to the inner wall of the locking ring (15), and the right end surface of the return spring (7) is connected to the inner wall of the locking ring (15).

5. The drug delivery device according to claim 1, characterized in that: The left end surface of the driving rod (6) is sleeved with a power spring (5), the left end surface of the power spring (5) is connected to the right end surface of the ratchet sleeve (11), a scale sleeve (13) is arranged inside the pen shaft (14), the right end surface of the power spring (5) is connected to the inner wall of the scale sleeve (13), and the side surface of the scale sleeve (13) is slidably connected to the inner wall of the pen shaft (14).

6. The drug delivery device according to claim 1, characterized in that: A medicine box (2) is fixedly arranged on the inner wall of the pen cap (1), a cartridge bottle (3) is arranged on the inner wall of the medicine box (2), and the inner wall of the medicine box (2) and the surface of the cartridge bottle (3) are slidably connected.

7. The drug delivery device according to claim 6, characterized in that A cartridge bottle rubber plug (4) is arranged on the inner wall of the right end of the cartridge bottle (3), a push rod gasket (9) is arranged on the right side surface of the cartridge bottle rubber plug (4), and the left end surface of the push rod (12) is in compression contact with the right side surface of the cartridge bottle rubber plug (4).

8. The drug delivery device according to claim 1, characterized in that The top surface of the pen cap (1) is provided with a sleeve frame (17).

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