WO2021088115A1

WO2021088115A1 - Disposable injection pen

Info

Publication number: WO2021088115A1
Application number: PCT/CN2019/119045
Authority: WO
Inventors: 王述芳; 任梦强; 罗来荣
Original assignee: 江苏万海医疗器械有限公司
Priority date: 2019-11-08
Filing date: 2019-11-18
Publication date: 2021-05-14
Also published as: CN110772687A

Abstract

Provided are a disposable injection pen and feedback assembly thereof; the feedback assembly comprises an upper feedback cylinder (610), a feedback connecting cylinder (620), and a feedback gear ring (630); the feedback assembly is located between a push cylinder (400) and a push rod rotational cylinder (300); the feedback connecting cylinder (620) has a feedback ring gear (640) on the side close to the feedback gear ring (630); both sides of the feedback gear ring (630) are provided with a feedback ring gear (640); the inner wall of the push rod cylinder (300) has an inner ring gear; when the feedback gear ring (630) moves along its axial direction, the corresponding side feedback gear ring (640) engages with or disengages from the inner ring gear, and the feedback ring gear (640) on the other side of the feedback gear ring (630) engages with or disengages from the feedback ring gear (640) on the feedback connecting cylinder (620); the inner wall of the feedback connecting cylinder (620) and the outer wall of the push cylinder (400) are slidingly connected by means of a concave-convex structure. The three parts of the disposable injection pen and feedback assembly thereof jump in conjunction when adjusted to a large scale, achieving the same effect as the original structure; when reverse rotation for back adjustment is performed, only the upper feedback cylinder (610) and the feedback connecting cylinder (620) in the upper part perform jump together; the sideways motion feedback is stable, no follow rotation of internal parts occurs, and inaccurate injection volume caused by the follow rotation is avoided, greatly reducing safety risks.

Description

Disposable injection pen

Technical field

The invention relates to the technical field of injection devices, in particular to a disposable injection pen and its feedback component.

Background technique

Disposable injection pen is a common medical appliance that can be used as a household. It is often used to inject insulin. See our company’s prior patent CN 209332900 U for the specific structure. However, in actual use, there are certain problems with the toggle feedback of this injection pen. When the injection volume is set, an internal follow-up will occur, causing the connecting rod to move forward and squeeze the liquid out, resulting in waste. At the same time, it also causes errors in the dosage of the patient's liquid injection, and there is a certain safety risk.

Summary of the invention

The first object of the present invention is to provide a feedback assembly. After the injection pen is used on a disposable injection pen, the feedback of the injection pen is stable, the internal parts will not follow-up, and the injection dose is prevented from being affected, and the potential safety hazard can be greatly reduced.

The second object of the present invention is to provide a disposable injection pen, which has stable toggle feedback during use, no follow-up of internal parts, avoids the influence of the injection dose, and can greatly reduce potential safety hazards.

In order to achieve the first objective, the first technical solution of the present invention is: a feedback assembly, including an upper feedback cylinder, a feedback connecting cylinder and a feedback gear ring, the lower part of the upper feedback cylinder abuts the upper part of the feedback connecting cylinder, The feedback connecting cylinder has a feedback gear ring on the side close to the feedback gear ring, both sides of the feedback gear ring have feedback gear rings, and the feedback gear ring on the corresponding side is in phase with the feedback gear ring on the feedback connecting cylinder. Cooperate.

In the above technical solution, the upper feedback cylinder is provided with a spring placement groove, and a compression spring is installed in the placement groove.

In order to achieve the first objective, the second technical solution of the present invention is: an injection pen, including the above-mentioned feedback component, and further including: a medicine bin, which is provided with at least one discharge port; Move in a linear direction to push the materials in the medicine bin from the discharge port; a push rod drum, which is configured to move back and forth toward or away from the medicine bin; and the push tube has a linkage dial ring Wherein, the push cylinder is configured to drive the linkage dial to rotate in a first direction when the push rod drum moves in a direction close to the drug warehouse, and the linkage dial is configured to rotate in a first direction When rotating, the screw is driven to move in the linear direction, and it also includes a fixed bracket. The outer wall of the push rod drum and the inner wall of the fixed bracket are connected by threads, and the inner wall of the push rod drum is connected to the shaft through a feedback component. The push cylinder is in transmission connection, the feedback assembly is located between the push cylinder and the push rod drum, the feedback connecting cylinder has a feedback gear ring on the side close to the feedback gear ring, and the inner wall of the push rod drum has Internal gear ring, when the feedback gear ring moves along its axial direction, the feedback gear ring on the corresponding side engages or disengages from the internal gear ring, and the feedback gear ring on the other side of the feedback gear ring and the feedback gear ring The feedback gear ring on the connecting cylinder is engaged or disengaged, and the inner wall of the feedback connecting cylinder and the outer wall of the pushing cylinder are slidingly connected by a concave-convex structure.

In the above technical solution, the injection pen further includes a scale cylinder sleeved on the push rod drum, the scale cylinder is connected to the push rod drum, and the outer wall of the scale cylinder is provided with a scale.

In the above technical solution, the injection pen includes a pen body tube, the medicine compartment is fixedly connected to one end of the pen body tube, and an observation hole is opened at one end of the pen body tube away from the medicine compartment.

In the above technical solution, the medicine compartment is provided with a bayonet, and the inner wall of the pen barrel is provided with a bayonet corresponding to the bayonet.

In the above technical solution, there is also a fixing seat, the fixing seat is matched with the linkage ring, the screw thread passes through the fixing seat, and the fixing seat is provided with a limiting rib, the limiting rib and The protrusions on the inner wall of the pen barrel are matched.

In the above technical solution, a button is connected to the end of the push rod drum away from the medicine bin, and the button can be retracted into the push rod drum.

In the above technical solution, the inner wall of the feedback connecting cylinder is provided with a guide bar, and the outer wall of the push cylinder is provided with a guide groove corresponding to the guide bar, and the guide bar is inserted into the guide groove.

In the above technical solution, internal threads are provided on the inner wall surface of the fixing bracket.

The beneficial effect of the present invention is that the present invention changes the original feedback barrel in the injection pen to the current feedback assembly. The feedback assembly is composed of the upper feedback barrel, the feedback connecting barrel and the feedback gear ring. The three components are linked to beating, achieving the same effect as the original structure. When the reversal is used for callback, only the upper feedback tube and the feedback connecting tube perform linkage bounce. The dialing feedback is stable, and the internal parts will not follow the rotation. , It can avoid the inaccurate injection volume caused by the follow-up, and greatly reduce the potential safety hazards.

Description of the drawings

Figure 1 is a three-dimensional schematic diagram of the injection pen of the present invention;

Figure 2 is a schematic cross-sectional view of the injection pen of the present invention;

Figure 3 is a schematic diagram of the structure of the housing and the feedback component;

Figure 4 is a schematic diagram of the structure of the scale cylinder, the fixed bracket push rod and the rotating cylinder;

Figure 5 is a schematic diagram of the structure of the push cylinder, the screw and the medicine bin;

Figure 6 is a three-dimensional schematic diagram of the feedback component of the present invention;

Figure 7 is a schematic cross-sectional view of the feedback component of the present invention;

Fig. 8 is a three-dimensional schematic diagram of the fixing seat in the present invention;

Figure 9 is a three-dimensional schematic diagram of the button in the present invention;

Figure 10 is a schematic cross-sectional view of the fixing bracket of the present invention.

The labels are as follows: medicine warehouse 100; discharge port 110; bayonet 120; medicine bottle 130; screw 200; push piston 210; push rod drum 300; button 310; push cylinder 400; linkage ring 410; fixed bracket 500; Internal thread 510; feedback assembly 600; upper feedback barrel 610; spring placement groove 611; compression spring 612; feedback connecting barrel 620; feedback gear ring 630; feedback gear ring 640; scale barrel 700; pen barrel 800; pen cap 810; Block 820; fixed seat 900; limiting rib 910.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so that the protection scope of the present invention can be more clearly defined.

In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they may be fixed connections or detachable connections. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood in specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention.

As shown in Figures 6 and 7, a feedback assembly includes an upper feedback cylinder 610, a feedback connecting cylinder 620, and a feedback gear ring 630. The lower part of the upper feedback cylinder 610 is opposed to the upper part of the feedback connecting cylinder 620, and the feedback The side of the connecting cylinder 620 close to the feedback ring gear 639 has a feedback ring gear 640, both sides of the feedback ring gear 630 have a feedback ring gear 640, and the feedback ring gear 630 on the corresponding side is connected to the feedback ring gear 620. The feedback ring gear 630 cooperates.

As shown in Figures 6 and 7, the upper feedback cylinder 610 has a spring placement groove 611, and a compression spring 612 is installed in the placement groove. The compression spring 612 always gives the feedback assembly 600 a downward thrust to ensure that the lower feedback tooth The meshing of the ring 640.

As shown in Figures 1-9, an injection pen, including the feedback assembly, further includes: a medicine bin 100, which is provided with at least one discharge port 110; a screw 200, which is configured to be movable in a linear direction to The material in the medicine bin 100 is pushed out from the discharge port 110; the push rod drum 300 is configured to move back and forth toward or away from the medicine bin 100; the push cylinder 400 has a linkage dial Ring 410; wherein, the push cylinder 400 is configured to drive the linkage ring 410 to rotate in a first direction when the push rod drum 300 moves toward the direction of the medicine compartment 100, the linkage ring 410 It is configured to drive the screw 200 to move in the linear direction when rotating in the first direction, and further includes a fixing bracket 500. The outer wall of the push rod drum 300 and the inner wall of the fixing bracket 500 are connected by threads. The inner wall of the push rod drum 300 is in transmission connection with the push drum 400 through a feedback assembly 600. The feedback assembly 600 is located between the push drum 400 and the push rod drum 300. The feedback connecting drum 620 is close to The feedback ring gear 630 side has a feedback ring gear 640, and the inner wall of the push rod drum 300 has an inner ring gear. When the feedback ring gear 630 moves along its axial direction, the feedback ring gear 640 on the corresponding side and the inner ring gear The gear ring is engaged or disengaged, and the feedback gear ring 630 on the other side of the feedback gear ring 630 is engaged or disengaged from the feedback gear ring 640 on the feedback connecting cylinder 620. The inner wall of the feedback connecting cylinder 620 and the pusher The outer wall of the barrel 400 is slidingly connected by a concave-convex structure.

As shown in Figures 1 and 4, it also includes a scale cylinder 700 sleeved on the push rod drum 300, the scale cylinder 700 is connected to the push rod drum 300, and the outer wall of the scale cylinder 700 is provided with Scale.

As shown in Figures 1 and 3, it also includes a pen body tube 800, the medicine compartment 100 is fixedly connected to one end of the pen body tube 800, and an observation hole is opened at one end of the pen body tube 800 away from the medicine compartment 100. One end is fitted with a pen cap 810, and the medicine bottle 130 is first put into the medicine container 100 during use, and then the medicine container 100 is fixed on the pen barrel 800.

As shown in FIG. 5, the medicine compartment 100 has a bayonet, and the inner wall of the pen barrel 800 has a detent 820 corresponding to the bayonet 120. In the past, the medicine compartment 100 and the pen barrel 800 were fixed by a convex In the way of ribs and slots, the ribs are inserted along the slot and then rotated to achieve locking, but this connection is unstable and slightly shakes during use, which affects the patient's injection.

As shown in FIG. 5, there is also a fixing seat 900 which is matched with the linkage ring 410. The screw 200 passes through the fixing seat 900 and is equipped with a pushing piston 210 at its end. There is a limiting rib 910 on the 900, and the limiting rib 910 is matched with the protrusion on the inner wall of the pen barrel 800. In the past, because the injection pen was used at a time, the fixing seat 900 was only fixed by a tight fit and used for a period of time. The rear fixing seat 900 is easy to loosen and shakes, which greatly affects the patient's use experience.

As shown in Figures 1 and 9, the push rod drum 300 is connected with a button 310 at one end far away from the medicine compartment 100. The button 310 can be retracted into the push rod drum 300. The lower part of the button 310 There is a ring-shaped card table at the connection point, which can clamp the button 310 when the button 310 is in the pulled-out state.

As shown in Figures 2 and 7, the inner wall of the feedback connecting cylinder 620 has a guide bar 621, and the outer wall of the push cylinder 400 has a guide groove corresponding to the guide bar 621, and the guide bar 621 is inserted into the guide bar 621. In the groove, the guide bar 621 and the guide groove are arranged to ensure that the feedback assembly 600 and the push cylinder 400 will not rotate relative to each other.

As shown in Figures 6 and 7, the cross section of the teeth on the feedback ring gear 640 is a right triangle, so that the slope of one side slope of the tooth is much greater than the other side slope. The teeth on the adjacent feedback ring gear 640 are formed by Disengagement to re-engagement is to slide directly along the right-angled edge, and the sound produced by the impact is more obvious.

As shown in Figure 10, the inner wall surface of the fixing bracket 500 is provided with internal threads 510. In traditional designs, threads are generally provided on the outer circumference of the scale cylinder 700, so that the scale cylinder 700 can be screwed in and out, but in actual use Since the scale cylinder 700 is unscrewed, dust may fall into the thread, which hinders the injection and affects the accuracy of the injection dose, which has a great safety hazard. However, if the screw is arranged in the scale cylinder 700 in this patent, it can greatly Avoid ingress of dust.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, but not to limit it. The protection scope of the present invention is not limited thereto, although referring to the foregoing The embodiments describe the present invention in detail, and those of ordinary skill in the art should understand that any person skilled in the art can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention. Or it may be easily conceived of changes, or equivalent replacements of some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered by the present invention Within the scope of protection. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A feedback assembly, characterized in that it comprises an upper feedback cylinder, a feedback connecting cylinder and a feedback gear ring, the lower part of the upper feedback cylinder abuts the upper part of the feedback connecting cylinder, and the feedback connecting cylinder has a side close to the feedback gear ring The feedback gear ring has a feedback gear ring on both sides of the feedback gear ring, and the feedback gear ring on its corresponding side is matched with the feedback gear ring on the feedback connecting cylinder.
The feedback assembly according to claim 1, wherein the upper feedback cylinder has a spring placement groove, and a compression spring is installed in the placement groove.
An injection pen, characterized by comprising the feedback component of any one of claims 1 to 2, and further comprising: a medicine bin, which is provided with at least one discharge port; and a screw, which is configured to be movable in a linear direction In order to push the material in the medicine bin from the discharge port; the push rod drum is configured to be able to move back and forth toward or away from the medicine bin; the push tube has a linkage dial ring; wherein, The push cylinder is configured to drive the linkage dial ring to rotate in a first direction when the push rod drum moves in a direction close to the drug warehouse, and the linkage dial ring is configured to drive when the linkage dial ring is configured to rotate in the first direction The screw moves along the linear direction and further includes a fixed bracket. The outer wall of the push rod drum and the inner wall of the fixed bracket are connected by threads, and the inner wall of the push rod drum is connected to the push drum through a feedback assembly. Transmission connection, the feedback assembly is located between the push cylinder and the push rod drum, the feedback connecting cylinder has a feedback ring gear on the side close to the feedback gear ring, and the inner wall of the push rod drum has an inner gear ring , When the feedback gear ring moves along its axial direction, the feedback gear ring on the corresponding side engages or disengages from the inner gear ring, and the feedback gear ring on the other side of the feedback gear ring is on the feedback connecting cylinder. The feedback ring gear engages or disengages, and the inner wall of the feedback connecting cylinder and the outer wall of the push cylinder are slidingly connected by a concave-convex structure.
The injection pen according to claim 1, further comprising a scale cylinder sleeved on the push rod drum, the scale cylinder is connected to the push rod drum, and the outer wall of the scale cylinder is provided with There are scales.
The injection pen according to claim 1, further comprising a pen body tube, the medicine compartment is fixedly connected to one end of the pen body tube, and an observation hole is opened at the end of the pen body tube away from the medicine compartment.
The injection pen according to claim 5, wherein the medicine compartment has a bayonet, and the inner wall of the pen barrel has a bayonet corresponding to the bayonet.
The injection pen according to claim 4, further comprising a fixing seat, the fixing seat is matched with the linkage ring, the screw thread passes through the fixing seat, and the fixing seat is provided with a limiting rib , The limiting rib is matched with the protrusion on the inner wall of the pen barrel.
The injection pen according to claim 1, wherein a button is connected to an end of the push rod drum away from the medicine compartment, and the button can be retracted into the push rod drum.
The disposable injection pen according to claim 1, wherein a guide bar is provided on the inner wall of the feedback connecting cylinder, and a guide groove corresponding to the guide bar is provided on the outer wall of the push cylinder, and the guide bar is installed Into the guide groove.
The disposable injection pen according to claim 1, wherein an internal thread is provided on the inner wall of the fixing bracket.