CN219743557U - injection pen - Google Patents

Abstract

The utility model discloses an injection pen, comprising: the pen comprises a pen holder, wherein a first mounting channel is arranged in the pen holder; the pen core support is arranged at the first end of the first installation channel and is used for installing a pen core; the first end of the adjusting sleeve is movably arranged at the second end of the first mounting channel, the first end of the adjusting sleeve is provided with the second mounting channel, and the first end of the adjusting sleeve is provided with a first non-return spring arm; the first end of the push rod is positioned in the second installation channel, the second end of the push rod faces the pen core bracket and extends out of the second installation channel to push the rubber plug of the pen core, the outer circumferential surface of the push rod is provided with a plurality of non-return teeth, the non-return teeth are distributed at intervals along the axial direction of the push rod, and the first non-return spring arm is matched with the non-return teeth to limit the push rod to move towards the second end of the adjusting sleeve; the non-return sleeve is arranged in the first installation channel and is matched with the non-return teeth so as to limit the push rod to move towards the second end of the first installation channel.

Description

Injection pen

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to an injection pen.

Background

Existing injection devices are largely divided into two types: one is a disposable injection needle tube conventionally used by medical staff, and the other is an injection pen. The injection pen is suitable for special patients, such as diabetics, hepatitis patients, etc., because these patients need to inject insulin, interferon, auxin, vaccine, etc., and the accuracy of the injection dosage is particularly high. In the prior art, most injection pens use the principle of screw drive, and the requirement of injecting the dosage of medicine can be adjusted. However, the injection pen has relatively complex structure, inconvenient use, inconvenient assembly and higher production cost.

Disclosure of Invention

The utility model aims to provide a novel technical scheme of an injection pen, which at least can solve the technical problems that the existing injection pen is complex in structure and inconvenient to assemble.

An embodiment of the present utility model provides an injection pen including: the pen comprises a pen holder, a first mounting channel and a second mounting channel, wherein the pen holder is formed into a columnar structure, and the first mounting channel penetrates through the pen holder along the axial direction of the first mounting channel; the refill support is arranged at the first end of the first installation channel and is used for installing a refill; the first end of the adjusting sleeve is movably arranged at the second end of the first mounting channel along the axial direction of the pen holder, the first end of the adjusting sleeve is provided with a second mounting channel extending along the axial direction of the adjusting sleeve, and a first non-return spring arm extends towards the pen core bracket; the first end of the push rod is positioned in the second installation channel, the second end of the push rod faces the refill support and extends out of the second installation channel to push the rubber plug of the refill, a plurality of non-return teeth are arranged on the peripheral surface of the push rod, the non-return teeth are distributed at intervals along the axial direction of the push rod, and the first non-return spring arm is matched with the non-return teeth to limit the push rod to move towards the second end of the adjusting sleeve; the non-return sleeve is arranged in the first installation channel and is matched with the non-return teeth so as to limit the push rod to move towards the second end of the first installation channel.

According to the injection pen provided by the embodiment of the utility model, the push rod can only move towards the direction of the pen core support through the cooperation of the non-return sleeve and the non-return teeth, and the push rod can only move towards the direction of the pen core support relative to the adjusting sleeve through the cooperation of the first non-return spring arm at the end part of the adjusting sleeve and the non-return teeth, so that the injection quantity of medicine can be adjusted by pulling the adjusting sleeve upwards, the medicine can be pushed by pressing the adjusting sleeve downwards, the operation is convenient, the structure is simple, the assembly of the injection pen is convenient, and the production cost of the injection pen can be reduced.

According to one embodiment of the utility model, a guide groove extending along the axial direction of the pen holder is formed in the first mounting channel, an elastic arm extending along the axial direction of the pen holder is arranged at the first end of the adjusting sleeve, the first end of the elastic arm is arranged on the adjusting sleeve, the second end of the elastic arm is movable, a first guide part is arranged on the outer side of the second end of the elastic arm, and the first guide part is movably arranged in the guide groove along the axial direction of the pen holder.

According to one embodiment of the utility model, the first guide portion extends obliquely towards the second end of the resilient arm.

According to one embodiment of the utility model, the second end of the elastic arm extends towards the inner side of the pen holder along the radial direction of the pen holder, and the first limiting part is matched with the non-return tooth to limit the moving distance of the second end of the elastic arm.

According to one embodiment of the present utility model, the cartridge holder includes: the support sleeve is arranged in the first mounting channel, is provided with a first containing channel penetrating along the axial direction of the support sleeve, and is suitable for containing the pen refill and limiting the position of the pen refill in the radial direction of the support sleeve; the limiting piece is inserted into one end, close to the push rod, of the support sleeve, a plurality of limiting grooves extending in the radial direction of the support sleeve are formed in the limiting piece, the limiting grooves are distributed in the axial direction of the support sleeve at intervals, the limiting grooves are suitable for accommodating flanging of the pencil lead, and the limiting grooves are matched with the flanging of the pencil lead to limit the position of the pencil lead in the axial direction of the support sleeve.

According to one embodiment of the utility model, the second end of the adjusting sleeve extends along the radial direction thereof towards the outer side of the adjusting sleeve to form a second limiting part, and the second limiting part is matched with the second end of the pen holder to limit the moving distance of the adjusting sleeve.

According to one embodiment of the utility model, the second end of the adjusting sleeve is provided with a mounting port, the mounting port is communicated with the second mounting channel, and the injection pen further comprises a pressing piece, and the pressing piece is detachably arranged at the mounting port.

According to one embodiment of the utility model, the outer side of the non-return sleeve is provided with a clamping part, the inner wall of the first installation channel is provided with a clamping groove corresponding to the clamping part in position, and the clamping part is clamped in the clamping groove.

According to one embodiment of the utility model, the second end of the push rod is provided with a second guiding part, and the outer circumferential surface of the second guiding part is attached to the inner wall of the second installation channel.

According to one embodiment of the utility model, the push rod, the adjusting sleeve and the non-return sleeve are respectively integrally formed injection molding pieces.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is an exploded view of the structure of an injection pen according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an internal structure of an injection pen according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a portion of the structure of an injection pen in accordance with an embodiment of the present utility model, from one perspective;

FIG. 4 is a cross-sectional view of a portion of the structure of an injection pen in accordance with an embodiment of the present utility model, from another perspective;

fig. 5 is a schematic structural view of a cartridge holder of an injection pen according to an embodiment of the present utility model;

fig. 6 is a sectional view of a cartridge holder of an injection pen according to an embodiment of the present utility model;

FIG. 7 is a schematic illustration of an adjustment sleeve of an injection pen mated with a pushrod according to an embodiment of the utility model;

fig. 8 is a cross-sectional view of another portion of an injection pen according to an embodiment of the present utility model.

Reference numerals:

an injection pen 100;

a pen holder 10; a guide groove 11; a clamping groove 12;

a cartridge holder 20; a bracket sleeve 21; a stopper 22; a limit groove 221; a first arc-shaped limiting plate 222; a second arc-shaped limiting plate 223;

an adjustment sleeve 30; a resilient arm 31; a first guide 311; a first stopper 312; a second stopper 32; a first check arm 33;

a push rod 40; a non-return tooth 41; a second guide 42;

a non-return sleeve 50; a clamping part 51;

and a pressing member 60.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

An injection pen 100 according to an embodiment of the present utility model is described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 8, an injection pen 100 according to an embodiment of the present utility model includes a barrel 10, a cartridge holder 20, an adjustment sleeve 30, a push rod 40, and a check sleeve 50.

Specifically, the pen holder 10 is formed into a columnar structure, a first installation channel penetrating along the axial direction of the pen holder 10 is formed in the pen holder 10, the pen core support 20 is installed at a first end of the first installation channel, the pen core support 20 is used for installing pen cores, a first end of the adjusting sleeve 30 is movably arranged at a second end of the first installation channel along the axial direction of the pen holder 10, a second installation channel extending along the axial direction of the adjusting sleeve 30 is formed at the first end of the adjusting sleeve 30, a first check spring arm 33 extends towards the pen core support 20, a first end of the push rod 40 is positioned in the second installation channel, a second end of the push rod 40 faces the pen core support 20 and stretches out of the second installation channel to push rubber plugs of the pen cores, a plurality of check teeth 41 are arranged on the outer peripheral surface of the push rod 40, the check teeth 41 are distributed at intervals along the axial direction of the push rod 40, the first check spring arm 33 is matched with the check teeth 41 to limit the push rod 40 to move towards the second end of the adjusting sleeve 30, the check sleeve 50 is arranged in the first installation channel, and the check sleeve 50 is matched with the check teeth 41 to limit the push rod 40 to move towards the second end of the first installation channel.

In other words, as shown in fig. 1 to 8, the injection pen 100 according to the embodiment of the present utility model is mainly composed of a barrel 10, a cartridge holder 20, an adjusting sleeve 30, a push rod 40, and a non-return sleeve 50, wherein the barrel 10 is formed in a tubular structure such that the inside of the barrel 10 forms a first installation channel, the inside of the cartridge holder 20 is formed in a shape matching with the cartridge for installing the cartridge, the cartridge may be a prefilled syringe, and the cartridge holder 20 is provided in the first installation channel and is located at a first end of the first installation channel. The adjustment sleeve 30 is formed in a tubular structure such that a second installation channel is formed at the inner side of the adjustment sleeve 30, a first end of the adjustment sleeve 30 is movably provided at a second end of the first installation channel in the axial direction of the cartridge, and a plurality of first check spring arms 33 extend toward the cartridge holder 20, the first ends of the first check spring arms 33 are provided at the first ends of the adjustment sleeve 30, the second ends of the first check spring arms 33 are gradually close to the axis of the adjustment sleeve 30, and can be away from the axis of the adjustment sleeve 30 under the action of external force.

As shown in fig. 1 to 4, a plurality of non-return teeth 41 are provided on the outer circumferential surface of the push rod 40, the non-return teeth 41 are distributed on the outer circumferential surface of the push rod 40 at intervals along the axial direction of the barrel 10, and the non-return teeth 41 extend obliquely toward the first end of the push rod 40, so that one side of the non-return teeth 41 toward the first end of the push rod 40 is an inclined surface. The first end of push rod 40 is located the second installation passageway, and the second end of push rod 40 is towards refill support 20 to stretch out the second installation passageway, can promote the plug of refill through the second end of push rod 40, and first non-return spring arm 33 can cooperate with a plurality of non-return teeth 41 on the push rod 40, specifically includes two kinds of situations:

in the first case, one end of the non-return tooth 41, which is close to the adjusting sleeve 30, is matched with the second end of the first non-return spring arm 33, so that the push rod 40 can be limited to move towards the second end of the adjusting sleeve 30; in the second case, when the push rod 40 moves toward the direction of the pen core holder 20, the inclined surface of the check tooth 41 can drive the second end of the first check spring arm 33 away from the axis of the adjustment sleeve 30, so that the push rod 40 can only move toward the direction of the pen core holder 20 relative to the adjustment sleeve 30.

As shown in fig. 1 to 4, the check sleeve 50 is installed in the first installation channel, and the check sleeve 50 is located between the adjustment sleeve 30 and the cartridge holder 20, the check sleeve 50 includes a barrel, the barrel is connected with the pen holder 10, the barrel is provided with a avoiding channel through which the push rod 40 passes, a plurality of second check spring arms are arranged in the avoiding channel, the second check spring arms can be identical to the first check spring arms 33 in structure, and the second check spring arms cooperate with the check teeth 41 to limit the movement of the push rod 40 towards the second end of the first installation channel, so that the push rod 40 can only move towards the cartridge holder 20 relative to the pen holder 10.

When the injection pen 100 of the embodiment of the utility model is used, firstly, the injection quantity of the medicine is regulated, the regulating sleeve 30 is pulled upwards during regulation, the pulling distance of the regulating sleeve 30 can be determined according to the injection quantity of the medicine, when the regulating sleeve 30 moves upwards, the second non-return spring arm is matched with the non-return teeth 41, and under the action of the second non-return spring arm, the push rod 40 does not move upwards along with the regulating sleeve 30, so that the length of the push rod 40 outside a second installation channel is changed, and the regulation of the injection quantity of the medicine is completed; after the injection quantity is regulated, the regulating sleeve 30 is pressed downwards to push the medicine in the pen core, when the regulating sleeve 30 moves downwards, the first non-return spring arm 33 is matched with the non-return teeth 41, under the action of the first non-return spring arm 33, the push rod 40 moves downwards along with the synchronous movement of the regulating sleeve 30, and the second end of the push rod 40 pushes the rubber plug of the pen core to push the medicine.

Therefore, according to the injection pen 100 of the embodiment of the present utility model, the thrust sleeve 50 is matched with the thrust teeth 41, so that the push rod 40 can only move towards the direction of the pen core support 20, and the first thrust spring arm 33 at the end of the adjustment sleeve 30 is matched with the thrust teeth 41, so that the push rod 40 can only move towards the direction of the pen core support 20 relative to the adjustment sleeve 30, thereby adjusting the injection amount of the medicine by pulling the adjustment sleeve 30 upwards, pushing the adjustment sleeve 30 downwards, and being convenient to operate, simple in structure, convenient to assemble the injection pen 100, and capable of reducing the production cost of the injection pen 100.

According to one embodiment of the present utility model, a guide groove 11 extending along the axial direction of the pen holder 10 is provided in the first installation channel, a first end of the adjusting sleeve 30 is provided with an elastic arm 31 extending along the axial direction of the pen holder 10, the first end of the elastic arm 31 is provided on the adjusting sleeve 30, a second end of the elastic arm 31 is movable, a first guide part 311 is provided outside the second end of the elastic arm 31, and the first guide part 311 is movably provided on the guide groove 11 along the axial direction of the pen holder 10.

That is, as shown in fig. 8, at least one guide groove 11 is provided in the first installation path, the guide groove 11 extends along the axial direction of the pen holder 10, the first end of the adjustment sleeve 30 is provided with axially extending elastic arms 31 of the pen holder 10, the number and positions of the elastic arms 31 correspond to those of the guide grooves 11, the first end of the elastic arms 31 is connected with the adjustment sleeve 30, the second end of the elastic arms 31 is movable, a first guide portion 311 is provided outside the second end of the elastic arms 31, and the first guide portion 311 is formed as a protrusion protruding outside the elastic arms 31.

In this embodiment, when the adjusting sleeve 30 is installed, the elastic arm 31 may be pressed in the radial direction of the adjusting sleeve 30, and the second end of the elastic arm 31 may move towards the axis of the adjusting sleeve 30, so that the first guiding portion 311 may enter the first installation channel, when the first guiding portion 311 moves to the position where the guiding slot 11 is located, the first guiding portion 311 moves into the guiding slot 11 under the elastic force of the elastic arm 31 itself, and the adjusting sleeve 30 may be prevented from rotating around the axis of the pen holder 10 by matching the first guiding portion 311 with the guiding slot 11, so as to improve the stability of the adjusting sleeve 30 when moving.

In some embodiments of the present utility model, the first guide 311 extends obliquely toward the second end of the elastic arm 31.

Specifically, as shown in fig. 7 and 8, the first guide 311 is inclined to extend toward the second end of the elastic arm 31 such that the first guide 311 is formed as an inclined surface toward one side of the cartridge holder 20, and when the adjustment sleeve 30 is mounted, the edge of the second end of the first mounting channel may be stopped against the inclined surface of the first guide 311 such that the first guide 311 may be movable toward the axis of the adjustment sleeve 30, thereby eliminating the need to manually press the elastic arm 31 at the time of mounting, and improving the assembly efficiency of the injection pen 100.

According to an embodiment of the present utility model, the second end of the elastic arm 31 extends toward the inside thereof in the radial direction of the barrel 10, and the first limiting portion 312 cooperates with the check teeth 41 to define the moving distance of the second end of the elastic arm 31.

As shown in fig. 3, since the first guide 311 is provided outside the elastic arm 31, when the first guide 311 is in contact with the end surface of the guide groove 11, the first guide 311 is separated from the guide groove 11, and therefore, the first stopper 312 is provided at the second end of the elastic arm 31, the first stopper 312 is formed in a plate-like structure extending in the radial direction of the barrel 10, the first stopper 312 is located between the elastic arm 31 and the check teeth 41, and when the elastic arm 31 approaches the axis of the adjustment sleeve 30, the first stopper 312 can abut against the check teeth 41, thereby restricting the movement of the elastic arm 31, and further preventing the first guide 311 from being separated from the guide groove 11.

In some embodiments of the present utility model, cartridge holder 20 includes: a bracket sleeve 21 and a stop 22.

Specifically, the support sleeve 21 is disposed in the first mounting channel, the support sleeve 21 is provided with a first accommodating channel penetrating along an axial direction of the support sleeve 21, the first accommodating channel is suitable for accommodating the pen refill and limiting the pen refill in a radial direction of the support sleeve 21, the limiting piece 22 is inserted into one end, close to the push rod 40, of the support sleeve 21, the limiting piece 22 is provided with a plurality of limiting grooves 221 extending along a radial direction of the support sleeve 21, the plurality of limiting grooves 221 are distributed at intervals along the axial direction of the support sleeve 21, the limiting grooves 221 are suitable for accommodating turned edges of the pen refill, and the limiting grooves 221 are matched with the turned edges of the pen refill to limit the pen refill in the axial direction of the support sleeve 21.

In other words, as shown in fig. 5 and 6, the cartridge holder 20 is mainly composed of a holder sleeve 21 and a stopper 22, wherein the holder sleeve 21 may be formed in a cylindrical structure, the holder sleeve 21 is provided with a first receiving passage penetrating therethrough in an axial direction, in this embodiment, the first receiving passage may receive the cartridge and may define a position of the cartridge in a radial direction of the holder sleeve 21, the stopper 22 is inserted into one end of the holder sleeve 21 near the push rod 40, one side of the stopper 22 near the axis of the holder sleeve 21 is provided with a plurality of stopper grooves 221, the stopper grooves 221 extend in a radial direction of the holder sleeve 21 so that the stopper grooves 221 are formed as notches adapted to the flange insertion of the cartridge, and the plurality of stopper grooves 221 are distributed in the stopper 22 in a spaced-apart relation in an axial direction of the holder sleeve 21, and the number of stopper grooves 221 and the distance between adjacent stopper grooves 221 may be determined according to the size and actual requirements of the cartridge, without limitation in the embodiment.

When the pen core is installed, the limiting piece 22 and the support sleeve 21 are in a separated state, a user can select a corresponding limiting groove 221 according to the size of the pen core to install, the limiting groove 221 can limit the position of the pen core in the axial direction of the support sleeve 21, then the limiting piece 22 is connected with the first end of the support sleeve 21, the pen core passes through the first accommodating channel, the first accommodating channel limits the position of the pen core in the radial direction of the support sleeve 21, and therefore the position of the pen core can be limited under the action of the limiting groove 221 and the first accommodating channel, the pen core support 20 can be suitable for pen cores of different sizes, and the applicability of the injection pen 100 can be improved.

Alternatively, as shown in fig. 5 and 6, the limiting member 22 mainly comprises a first arc limiting plate 222 and a second arc limiting plate 223, the first end of the first arc limiting plate 222 is provided with a first inserting portion, the cross section of the first inserting portion may be formed into a semicircle, the first end of the second arc limiting plate 223 is provided with a second inserting portion, the cross section of the second inserting portion may also be formed into a semicircle, the first inserting portion and the second inserting portion may be enclosed into a circular tube structure, and the outer diameter of the circular tube structure is approximately the same as the radial dimension of the first end side of the first accommodating channel, so that the first inserting portion and the second inserting portion may be inserted into the first end of the first accommodating channel, and the first arc limiting plate 222 and the second arc limiting plate 223 enclose to form a tubular structure, so that the first arc limiting plate 222 and the second arc limiting plate 223 define a second accommodating channel penetrating along the axial direction of the bracket sleeve 21, and the second accommodating channel and the first accommodating channel may be coaxially arranged, and the position of the pen core is defined in the radial direction of the bracket sleeve 21 by the second accommodating channel.

The limiting groove 221 is disposed in the second accommodating channel, which may specifically include but not limited to the following three cases: in the first case, the plurality of limiting grooves 221 are respectively disposed on the first arc limiting plate 222; in the second case, the plurality of limiting grooves 221 are respectively disposed on the second arc limiting plate 223; in the third case, a part of the limiting groove 221 is disposed on the first arc limiting plate 222, and another part of the limiting groove 221 is disposed on the second arc limiting plate 223.

The specific position of the limiting groove 221 may be determined according to the specific structure and actual requirement of the cartridge, and is not limited in this embodiment.

According to an embodiment of the present utility model, the second end of the adjustment sleeve 30 is extended toward the outside thereof along the radial direction thereof with a second stopper 32, and the second stopper 32 cooperates with the second end of the barrel 10 to define the moving distance of the adjustment sleeve 30.

That is, as shown in fig. 7, the adjustment sleeve 30 may be composed of a first functional section and a second functional section having different radial dimensions, the first end of the second functional section being connected to the first section of the first functional section, the first functional section being movably disposed at the second end of the first mounting channel in the axial direction of the barrel 10, the radial dimension of the second functional section being greater than the radial dimension of the first functional section, such that the distance of downward movement of the adjustment sleeve 30 may be defined by cooperation of the first end of the second functional section with the second end of the barrel 10 using the first end of the second functional section as the second limiting portion 32.

In some embodiments of the present utility model, the second end of the adjustment sleeve 30 is provided with a mounting port, which communicates with the second mounting channel, and the injection pen 100 further includes a pressing member 60, where the pressing member 60 is detachably provided.

As shown in fig. 3 and 4, in order to conveniently install the push rod 40, an installation opening is provided at the second end of the adjustment sleeve 30 and is in communication with the second installation channel, and when installed, the push rod 40 may extend into and pass through the second installation channel from the installation opening, and the elastic arm 31 does not need to be manually opened during the installation process, so that the assembly efficiency of the injection pen 100 may be improved. The mounting opening is detachably connected with a pressing member 60, specifically, the pressing member 60 can be connected with the adjusting sleeve 30 in a clamping manner so as to close the mounting opening after the push rod 40 is mounted, and the pressing member 60 can provide a pressing position for a user in use.

According to one embodiment of the present utility model, the outer side of the non-return sleeve 50 is provided with a clamping portion 51, the inner wall of the first installation channel is provided with a clamping groove 12 corresponding to the position of the clamping portion 51, and the clamping portion 51 is clamped in the clamping groove 12.

Specifically, as shown in fig. 1 to 3, two clamping portions 51 are disposed on the outer side of the non-return sleeve 50, the clamping portions 51 are formed into a wedge-shaped block structure protruding from the outer peripheral surface of the non-return sleeve 50, clamping grooves 12 corresponding to the number and positions of the clamping portions 51 are disposed on the inner wall of the first mounting channel, and the clamping portions 51 can be clamped in the clamping grooves 12, so that the non-return sleeve 50 can be fixed in the first mounting channel in a clamping manner, and the assembly of the injection pen 100 is facilitated.

In some embodiments of the present utility model, the second end of the push rod 40 is provided with a second guide portion 42, and an outer circumferential surface of the second guide portion 42 is fitted to an inner wall of the second installation channel.

That is, as shown in fig. 3 and 4, the second end of the push rod 40 may be provided with the second guide portion 42 having the same radial dimension as the second installation channel, so that the second guide portion 42 may be attached to the inner wall of the second installation channel, thereby preventing the push rod 40 from shaking, improving the stability of the push rod 40 when moving, and thus ensuring the accuracy of pushing the medicine.

According to one embodiment of the present utility model, the push rod 40, the adjustment sleeve 30 and the non-return sleeve 50 are each integrally formed as an injection molded part.

In this embodiment, the push rod 40, the adjusting sleeve 30 and the non-return sleeve 50 are respectively injection molded integrally, so that the processing difficulty of the injection pen 100 can be reduced, and the production cost of the injection pen 100 can be reduced.

In summary, according to the injection pen 100 of the embodiment of the present utility model, the thrust sleeve 50 is matched with the thrust teeth 41, so that the push rod 40 can only move towards the direction of the pen core holder 20, and the first thrust spring arm 33 at the end of the adjustment sleeve 30 is matched with the thrust teeth 41, so that the push rod 40 can only move towards the direction of the pen core holder 20 relative to the adjustment sleeve 30, thereby adjusting the injection amount of the medicine by pulling the adjustment sleeve 30 upwards, pushing the adjustment sleeve 30 downwards, and being convenient to operate, simple in structure, convenient to assemble the injection pen 100, and capable of reducing the production cost of the injection pen 100.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An injection pen, comprising:

the pen comprises a pen holder (10), wherein the pen holder (10) is in a columnar structure, and a first installation channel penetrating along the axial direction of the pen holder (10) is arranged in the pen holder;

the refill support (20) is arranged at the first end of the first installation channel, and the refill support (20) is used for installing a refill;

the first end of the adjusting sleeve (30) is movably arranged at the second end of the first mounting channel along the axial direction of the pen holder (10), the first end of the adjusting sleeve (30) is provided with a second mounting channel extending along the axial direction of the adjusting sleeve, and a first non-return spring arm (33) extends towards the pen core bracket (20) from the first end of the adjusting sleeve (30);

the first end of the push rod (40) is positioned in the second installation channel, the second end of the push rod (40) faces the cartridge support (20) and stretches out of the second installation channel to push the rubber plug of the cartridge, a plurality of non-return teeth (41) are arranged on the outer circumferential surface of the push rod (40), the non-return teeth (41) are distributed at intervals along the axial direction of the push rod (40), and the first non-return spring arms (33) are matched with the non-return teeth (41) to limit the push rod (40) to move towards the second end of the adjusting sleeve (30);

the non-return sleeve (50) is arranged in the first installation channel, and the non-return sleeve (50) is matched with the non-return teeth (41) so as to limit the push rod (40) to move towards the second end of the first installation channel.

2. Injection pen according to claim 1, characterized in that a guiding groove (11) extending along the axial direction of the pen holder (10) is arranged in the first mounting channel, a first end of the adjusting sleeve (30) is provided with an elastic arm (31) extending along the axial direction of the pen holder (10), the first end of the elastic arm (31) is arranged on the adjusting sleeve (30), a second end of the elastic arm (31) is movable, a first guiding part (311) is arranged outside the second end of the elastic arm (31), and the first guiding part (311) is movably arranged on the guiding groove (11) along the axial direction of the pen holder (10).

3. Injection pen according to claim 2, characterized in that the first guide (311) extends obliquely towards the second end of the resilient arm (31).

4. The injection pen according to claim 2, characterized in that the second end of the elastic arm (31) extends toward the inside thereof in the radial direction of the barrel (10) with a first stopper portion (312), the first stopper portion (312) cooperating with the non-return tooth (41) to define the movable distance of the second end of the elastic arm (31).

5. The injection pen according to claim 1, characterized in that the cartridge holder (20) comprises:

the support sleeve (21) is arranged in the first installation channel, the support sleeve (21) is provided with a first containing channel penetrating along the axial direction of the support sleeve (21), and the first containing channel is suitable for containing the pen refill and limiting the position of the pen refill in the radial direction of the support sleeve (21);

the limiting piece (22), limiting piece (22) peg graft in support sleeve (21) be close to the one end of push rod (40), limiting piece (22) are equipped with a plurality of edges support sleeve (21) radially extending spacing groove (221), a plurality of spacing groove (221) are followed support sleeve (21) axially spaced apart distributes, spacing groove (221) are suitable for holding the turn-ups of refill, spacing groove (221) with the turn-ups cooperation of refill is in support sleeve (21) axial limiting the position of refill.

6. The injection pen according to claim 1, characterized in that the second end of the adjustment sleeve (30) extends radially towards its outer side with a second limit portion (32), the second limit portion (32) cooperating with the second end of the barrel (10) to define the movement distance of the adjustment sleeve (30).

7. The injection pen according to claim 1, wherein the second end of the adjustment sleeve (30) is provided with a mounting opening, which communicates with the second mounting channel, the injection pen further comprising a pressing member (60), the pressing member (60) being detachably arranged at the mounting opening.

8. The injection pen according to claim 1, wherein a clamping portion (51) is provided on the outer side of the non-return sleeve (50), a clamping groove (12) corresponding to the position of the clamping portion (51) is provided on the inner wall of the first installation channel, and the clamping portion (51) is clamped in the clamping groove (12).

9. The injection pen according to claim 1, wherein a second end of the push rod (40) is provided with a second guide portion (42), and an outer circumferential surface of the second guide portion (42) is fitted to an inner wall of the second mounting passage.

10. The injection pen according to any one of claims 1 to 9, wherein the push rod (40), the adjustment sleeve (30) and the non-return sleeve (50) are each integrally formed injection-molded parts.