Automatic injection pen with gear mechanism

Abstract

The utility model relates to the field of automatic injection pens, in particular to an automatic injection pen with a gear mechanism. Comprising a pen body, medicine is clamped to one end of the pen body, a push rod capable of pushing out the medicine is arranged in the middle, and a knob controlling the push rod to move in the axial direction is arranged at the other end of the pen body and rotates around the axis of the pen body in a stepping mode through a gear mechanism. The gear mechanism comprises a buckle and clamping teeth, the buckle is connected with the rotary knob, the clamping teeth are evenly fixed to the pen body around the axis of the pen body, and a clamping groove is formed between every two adjacent clamping teeth and used for being connected with the buckle in a clamped mode. And when the buckle moves from any clamping groove to the clamping motion of the adjacent clamping groove, the buckle corresponds to the minimum rotating angle of the knob. By arranging the gear mechanism composed of the buckle and the clamping teeth, the rotary knob can rotate in a stepping mode relative to the pen body, the relative rotation angle of the rotary knob and the pen body is locked without external force, and an operator can conveniently achieve rapid and accurate adjustment of the medicine injection amount every time.

Description

Technical Field

[0001] The utility model relates to the field of auto-injectors, and particularly to an auto-injector with a gear mechanism. Background Art

[0002] Chronic diseases are spreading globally and developing rapidly. Medical staff and patients who self-inject drugs at home often use injectors to inject drugs for the purpose of treating chronic diseases. Injector drug treatment can be divided into diabetes treatment, growth hormone treatment, osteoporosis treatment, fertility and other treatments. These diseases may require medical staff or patients to regularly inject drug treatment, and the injected drugs can enter different parts of the body every day. For example, insulin doses are injected, and a reusable injector is used for daily insulin injection. The insulin dose is selected by manually turning the knob and observing the indicator at the display window of the injector.

[0003] However, for some patients with poor eyesight, it is a relatively difficult thing to accurately identify the indicator at the display window during single-person operation. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an auto-injector with a gear mechanism to solve the problem that it is inconvenient for patients with poor eyesight to adjust the injection dose in the prior art.

[0005] The technical solution of the utility model is: an auto-injector with a gear mechanism, including a pen body, one end of the pen body is clamped with a drug, a push rod capable of pushing out the drug is arranged in the middle, a knob for controlling the axial movement of the push rod is arranged at the other end of the pen body, and the knob rotates step by step around the axis of the pen body through a gear mechanism;

[0006] The gear mechanism includes a buckle and teeth. Among them, the buckle is connected to the knob, the teeth are evenly fixed on the pen body around the axis of the pen body, and a slot is formed between adjacent teeth for the buckle to be clamped; when the buckle moves from any slot to the adjacent slot for clamping, it corresponds to the minimum angle of rotation of the knob.

[0007] Preferably, the knob includes a holding part arranged on the outside and a connecting part arranged close to the axis. A plurality of buckles are arranged and fixed on the connecting part in a spiral shape. One end of the buckle away from the connecting part is set as a clamping end, and the clamping end is clamped with the slot.

[0008] Preferably, the buckle includes an elastic arm arranged around the axis of the knob. One end of the elastic arm close to the connecting part is bent and fixed to the connecting part, so that a certain gap is formed between the end of the elastic arm away from the connecting part and the connecting part, and this gap provides a space for rebounding during the clamping movement of the elastic arm.

[0009] Preferably, the clamping end is configured as a protrusion protruding along the radial direction of the knob at one end of the elastic arm away from the connecting portion, and the protrusion jumps along the radial direction of the knob during the clamping movement.

[0010] Preferably, the thickness of the elastic arm in the radial direction decreases as the distance from its connecting end to the connecting portion increases.

[0011] Preferably, the projections of the engaging teeth and the engaging grooves along the axial direction form a continuous and smooth wavy line, and the protrusion is arranged in imitation of the engaging groove.

[0012] Compared with the prior art, the advantages of the present utility model are as follows:

[0013] (1) By providing a gear mechanism composed of a buckle and engaging teeth in this application, the knob can perform a stepwise rotation relative to the pen body, and the relative rotation angle between the knob and the pen body is locked without external force, facilitating the operator to quickly and accurately adjust the drug injection amount each time.

[0014] (2) The setting of the gear mechanism not only enables the knob to be locked at the required angle relative to the pen body, but also enables patients with poor eyesight to judge the rotation angle through the collision sound generated between the engaging teeth and the engaging grooves during the clamping action, realizing the injection of drugs in a fixed amount each time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0016] Figure 1 is a structural diagram of an automatic injection pen with a gear mechanism according to the present utility model;

[0017] Figure 2 is a cross-sectional view of the knob and the gear mechanism according to the present utility model;

[0018] Figure 3 is the Figure 2 A - A cross-sectional view according to the present utility model;

[0019] Figure 4 is a structural diagram of the buckle according to the present utility model;

[0020] Among them: 1. Pen body, 2. Cartridge, 3. Pusher, 4. Knob, 41. Holding portion, 42. Connecting portion, 5. Gear mechanism, 51. Buckle, 511. Elastic arm, 512. Protrusion, 52. Engaging teeth, 53. Engaging groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The content of the present utility model will be further described in detail below in conjunction with specific embodiments:

[0022] As Figure 1As shown in the figure, an automatic injection pen with a gear mechanism can be used for automatic insulin injection in diabetes. It includes a pen body 1, and a cartridge 2 is snap-connected to one end of the pen body 1. The cartridge 2 is a bottle with an open bottom. After being installed on the pen body 1, a push rod 3 in the middle of the pen body 1 can extend into the cartridge 2 through the opening at the bottom of the cartridge 2 to push out the liquid medicine in the bottle. In this embodiment, the movement of the push rod 3 is driven by a motor in the pen body 1, and the operation of the motor is controlled by the rotation of a knob 4 at the other end of the pen body 1 and in combination with an electronic component such as an encoder that can collect the rotation signal.

[0023] The knob 4 realizes a preset angle or a multiple of the preset angle of rotation relative to the pen body 1 each time through the gear mechanism 5, and keeps the angle fixed without external force, which is called step-by-step rotation.

[0024] As Figure 2 and Figure 3 As shown in the figure, the gear mechanism 5 includes a buckle 51 and a tooth 52. Among them, the buckle 51 is fixed on the knob 4. The tooth 52 is fixed on the pen body 1 and is evenly arranged around the axis of the pen body 1. A slot 53 is formed between adjacent teeth 52. The buckle 51 is snap-connected to the slot 53 and moves from the current slot 53 to the adjacent slot 53 in a snap-connection movement as the knob 4 rotates. When the buckle 51 is snap-connected to the slot 53, the relative rotation angle between the knob 4 and the pen body 1 can be locked without external force, and a single snap-connection movement corresponds to the minimum rotation angle of the knob 4.

[0025] Specifically, the knob 4 includes a grip portion 41 provided on the outside and a connecting portion 42 close to the axis. The connecting portion 42 is arranged as a hollow cylinder, and three buckles 51 are arranged and fixed on the connecting portion 42 in a spiral shape. One end of any buckle 51 away from the connecting portion 42 is set as a snap-connection end.

[0026] As Figure 4 As shown in the figure, the buckle 51 includes an elastic arm 511 arranged around the axis of the knob 4, so that the elastic arm 511 is made of an elastic material, and one end close to the connecting portion 42 is bent and fixed to the connecting portion 42, so that a certain gap is formed between the end of the elastic arm 511 away from the connecting portion 42 and the connecting portion 42, and this gap provides a space for rebound when the elastic arm 511 makes a snap-connection movement.

[0027] The snap-connection end is set as a protrusion 512 where the end of the elastic arm 511 away from the connecting portion 42 protrudes radially outward of the knob 4. When making a snap-connection movement, the protrusion 512 jumps radially along the knob 4 as the elastic arm 511 deforms.

[0028] In order to make the deformation of the elastic arm 511 smoother, the thickness of the elastic arm 511 in the radial direction gradually decreases as the distance from its fixed end of the connecting portion 42 increases. That is, the closer to the clamping end, the smaller the thickness of the elastic arm 511 and the greater the amount of deformation. At the same time, the projections of the locking teeth 52 and the card slots 53 in the axial direction form a continuous and smooth wavy line, without sharp edges and corners, and the outer edge surface of the protrusion 512 is also configured to conform to the card slot 53. When the locking teeth 52 and the card slots 53 perform the clamping action, no jamming will occur.

[0029] The setting of the gear mechanism 5 not only enables the knob 4 to be locked at the required angle relative to the pen body 1, but also enables patients with poor eyesight to judge the rotation angle through the collision sound generated by the locking teeth 52 during the clamping action with the card slots 53, so as to achieve quantitative injection of drugs each time.

[0030] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. An automatic injection pen with a gear mechanism, characterized in that: The pen body (1) comprises a medicine clamped at one end of the pen body (1), a push rod (3) capable of pushing out the medicine is arranged in the middle, and a knob (4) for controlling the axial movement of the push rod (3) is arranged at the other end of the pen body (1), and the knob (4) is rotated step by step around the axis of the pen body (1) through a gear mechanism (5); The gear mechanism (5) comprises a buckle (51) and a latching tooth (52), wherein the buckle (51) is connected to the knob (4), the latching tooth (52) is evenly fixed on the pen body (1) around the axis of the pen body (1), and a latching groove (53) is formed between adjacent latching teeth (52) for the buckle (51) to latch; when the buckle (51) performs a latching movement from any latching groove (53) to an adjacent latching groove (53), it corresponds to the minimum angle of rotation of the knob (4).

2. The automatic injection pen with a gear mechanism according to claim 1, characterized in that: The knob (4) comprises a gripping portion (41) arranged on the outside, and a connecting portion (42) arranged close to the axis, a plurality of buckles (51) are provided and are fixed on the connecting portion (42) in a spiral shape, and an end of the buckle (51) away from the connecting portion (42) is provided as a clamping end, and the clamping end is clamped with a clamping groove (53).

3. The automatic injection pen with a gear mechanism according to claim 2, characterized in that: The buckle (51) comprises an elastic arm (511) arranged around the axis of the knob (4); one end of the elastic arm (511) close to the connecting portion (42) is bent and fixed to the connecting portion (42); and a certain gap is formed between the end of the elastic arm (511) away from the connecting portion (42) and the connecting portion (42); the gap provides a rebound space when the elastic arm (511) performs a snapping movement.

4. The automatic injection pen with a gear mechanism according to claim 3, characterized in that: The clamping end is configured as a protrusion (512) which is arranged to protrude radially along the knob (4) at one end of the elastic arm (511) away from the connecting portion (42); the protrusion (512) jumps radially along the knob (4) during the clamping movement.

5. The automatic injection pen with a gear mechanism according to claim 4, characterized in that: The thickness of the elastic arm (511) in the radial direction decreases as the distance between the elastic arm (511) and the connecting end of the connecting portion (42) increases.

6. The automatic injection pen with a gear mechanism according to claim 4, characterized in that: The projections of the latch teeth (52) and the latch groove (53) along the axial direction form a continuous and smooth wavy line, and the protrusion (512) and the latch groove (53) are arranged in a contoured manner.

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