Medicine injection device capable of adjusting dosage

Abstract

The utility model discloses a dosage-adjustable medicine injection device, and particularly relates to the technical field of medicine injection.The dosage-adjustable medicine injection device comprises a main body shell, an upper base is coaxially installed in an inner cavity of one end of the main body shell, a metering adjuster is slidably inserted into an opening of the other end of the main body shell, and an adjusting outer cylinder of the metering adjuster coaxially sleeves one end of the upper base; an adjusting inner cylinder of the metering adjuster is in threaded connection with a spiral push rod, a linear groove of the spiral push rod is in linear sliding connection with a converter, the converter is provided with a fixing step matched with an annular adjuster step of the metering adjuster, the upper base is provided with a one-way gear ring matched with an elastic pawl of the stopper, and the stopper is in threaded connection with the spiral push rod. According to the adjustable dose medicine injection device, the structure of an existing adjustable dose medicine injection device is simplified, meanwhile, certain injection precision is guaranteed, and the adjustable dose medicine injection device is simple and reliable in structure and convenient to produce.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medicine injection, specifically relates to a medicine injection device with adjustable dose. BACKGROUND

[0002] The common adjustable dose medicine injection device (such as insulin injection pen) on the market is used in cooperation with a cartridge bottle, and there are reusable injection pens (replaceable cartridge bottle) and disposable injection pens (cartridge bottle and injection pen are directly assembled together, and are discarded after use).

[0003] At present, some new medicine injection requirements (such as GLP-1 weight loss medicine) appear on the market, and the minimum single injection dose requirement is generally 0.1-0.2ml, and high precision is not required.

[0004] Therefore, a new type of medicine injection device with adjustable dose is required. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the utility model discloses a medicine injection device with adjustable dose.

[0006] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0007] The utility model provides a kind of adjustable dose medicine injection device, including main body shell, the cavity of one end of main body shell is coaxially installed with upper base, the other end opening of main body shell is slidably inserted with metering regulator, the outer wall of one end of upper base is provided with several uniform distribution straight grooves, and straight groove is parallel with the axis of upper base, the adjusting outer tube of metering regulator is coaxially equipped with one end of upper base, and the end of several elastic arms of adjusting outer tube protrudes and is adapted with straight groove, the adjusting inner tube of metering regulator is threadedly connected with screw push rod, the linear slot of screw push rod is linearly slidably connected with converter, the outer end edge annular protrusion of converter is slidably adapted with the end annular groove of metering regulator, and converter is provided with the fixed step of adapting annular regulator step of metering regulator, the cavity of one end of upper base away from converter is coaxially installed with stopper, and upper base is provided with the one-way gear ring of adapting elastic pawl of stopper, the stopper is threadedly connected with screw push rod, the cavity of one end of main body shell installation upper base is linearly slidably connected with straight groove, the outer wall of metering regulator is provided with annular indicating groove, and main body shell is provided with observation window adapted with annular indicating groove;The cavity of one end of main body shell installation upper base is coaxially connected with medicine bottle support, and medicine bottle support is filled with cassette bottle, the one end of screw push rod is installed with push rod disc adapted with the built-in piston of cassette bottle.

[0008] As a preferred technical scheme of the utility model, the adjusting inner tube is coaxially inserted into the upper base, and the adjusting inner tube extends out of the regulator clamping tooth adapted with the base clamping tooth built-in the upper base.

[0009] As a preferred technical scheme of the utility model, the main body shell is a hollow main body shell, the lower base is coaxially fixedly installed in the cavity of the hollow main body shell, and the press-locking assembly linearly slidably connected with the straight groove is arranged in the cavity of the lower base.

[0010] As a preferred technical scheme of the utility model, the press-locking assembly comprises: an inner ring tooth connector coaxially fixedly installed in the cavity of the lower base, the anti-rotation piece linearly slidably connected with the straight groove is coaxially slidably installed in the cavity of the lower base, the spring coaxially sleeved with the anti-rotation piece abuts against the inner ring tooth connector, and the anti-rotation piece is provided with an outer ring tooth adapted and plugged with the inner ring tooth connector.

[0011] As a preferred technical scheme of the utility model, the lower base is threadedly connected with the medicine bottle support, the edge of the cassette bottle presses the anti-rotation piece, and when the cassette bottle is separated from the anti-rotation piece, the outer ring tooth of the anti-rotation piece is separated from the inner ring tooth of the inner ring tooth connector.

[0012] As a preferred technical scheme of the utility model, the medicine bottle support is provided with a split pen cap, the split pen cap comprises: a pen cap upper cover with an inner wall annular protrusion clamped into a medicine bottle support annular groove, and the pen cap upper cover is coaxially connected with a pen cap lower cover through interference fit.

[0013] As a preferred technical scheme of the utility model, the outer wall of the hollow main body shell is attached with a scale disc matched with the observation window, and the scale disc is provided with an observation opening matched with the annular indicating groove.

[0014] As a preferred technical scheme of the utility model, the main body shell is an integrated main body shell, and the upper base is coaxially clamped in the inner wall of the integrated main body shell, the integrated main body shell is linearly and slidingly connected with the linear groove, and the medicine bottle support is coaxially clamped with the integrated main body shell.

[0015] As a preferred technical scheme of the utility model, the medicine bottle support is coaxially provided with an integrated pen cap, and an inner wall annular protrusion of the integrated pen cap is clamped into a medicine bottle support annular groove.

[0016] As a preferred technical scheme of the utility model, the outer wall of the integrated main body shell is provided with a scale matched with the annular indicating groove.

[0017] The utility model has the advantages of:

[0018] First, the two embodiments of the application simplify the structure of the existing adjustable dose medicine injection device (such as an insulin injection pen), while ensuring a certain adjustable dose medicine injection accuracy, and are simple in structure, reliable, convenient to produce and suitable for a large number of low-precision adjustable dose medicine injection needs.

[0019] Second, the two embodiments of the application are provided with a plugging protrusion on the screw push rod, and when the injection dose is adjusted at a time, the set dose is limited to be not greater than the remaining dose in the cartridge bottle, and the remaining dose of the liquid medicine in the cartridge bottle is directly displayed, thereby improving the convenience of use. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure schematic view of the utility model embodiment one;

[0021] Figure 2 It is a whole sectional view of the utility model embodiment one;

[0022] Figure 3 It is the utility model embodiment one Figure 2 A magnified view of the position A;

[0023] Figure 4 It is the utility model embodiment one Figure 2 A magnified view of the position B;

[0024] Figure 5Structure schematic view of one angle of the metering regulator of the embodiment one of the utility model;

[0025] Figure 6 Structure schematic view of another angle of the metering regulator of the embodiment one of the utility model;

[0026] Figure 7 Structure schematic view of the upper base of the embodiment one of the utility model;

[0027] Figure 8 Structure schematic view of the upper base and the blocking device of the embodiment one of the utility model;

[0028] Figure 9 Structure schematic view of the screw push rod and the converter of the embodiment one of the utility model;

[0029] Figure 10 Structure schematic view of the screw push rod and the push rod disc of the embodiment one of the utility model;

[0030] Figure 11 Exploded view of the blocking device and the pressing locking assembly of the embodiment one of the utility model;

[0031] Figure 12 Structure schematic view of the inner ring tooth connector of the embodiment one of the utility model;

[0032] Figure 13 Whole structure schematic view of the embodiment two of the utility model;

[0033] Figure 14 Whole sectional view of the embodiment two of the utility model;

[0034] Figure 15 Structure schematic view of the integrated main body shell of the embodiment two of the utility model.

[0035] List of figure mark:

[0036] 101, hollow main body shell; 102, integrated main body shell;

[0037] 2, upper base; 201, base clamping tooth; 202, one-way tooth ring;

[0038] 3, screw push rod; 301, straight line groove; 302, plugging protrusion;

[0039] 4, metering regulator; 401, adjusting outer cylinder; 402, elastic arm; 403, adjusting inner cylinder; 404, regulator clamping tooth; 405, regulator step;

[0040] 5, converter; 501, fixed step;

[0041] 6, blocking device; 7, push rod disc;

[0042] 8, press locking assembly; 801, inner ring tooth connector; 802, anti-rotation member; 803, spring;

[0043] 9, medicine bottle support; 10, cassette bottle; 11, piston;

[0044] 12, split pen cap; 121, pen cap upper cover; 122, pen cap lower cover;

[0045] 13, dial; 14, integrated pen cap; 15, lower base. DETAILED DESCRIPTION

[0046] The utility model will be further illustrated in conjunction with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the utility model and not used to limit the scope of the utility model.

[0047] Please refer to Figures 1-15 ,

[0048] Example one

[0049] A dose-adjustable medicine injection device, comprising a hollow main body shell 101, the inner cavity of one end of the hollow main body shell 101 is coaxially provided with an upper base 2, and the other end of the hollow main body shell 101 is slidably inserted with a metering regulator 4. The outer wall of one end of the upper base 2 is provided with a plurality of uniformly distributed straight grooves, and the straight grooves are parallel to the axis of the upper base 2. The adjusting outer cylinder 401 of the metering regulator 4 is coaxially sleeved with one end of the upper base 2, and the end protrusions of the plurality of elastic arms 402 of the adjusting outer cylinder 401 are matched with the straight grooves. The adjusting inner cylinder 403 of the metering regulator 4 is threadedly connected with a screw push rod 3, and the straight grooves 301 of the screw push rod 3 are linearly slidably connected with a converter 5. The screw push rod 3 is provided with two straight grooves 301 parallel to the axis of the screw push rod 3. The outer end edge annular protrusion of the converter 5 is slidably matched with the end annular groove of the metering regulator 4, and the converter 5 is provided with a fixed step 501 matched with the annular regulator step 405 of the metering regulator 4. The converter 5 can linearly move relative to the metering regulator 4 under the constraint of the end annular groove of the metering regulator 4, so that the fixed step 501 is separated from the regulator step 405, and after the fixed step 501 is separated from the regulator step 405, the metering regulator 4 can rotate relative to the converter 5. The inner cavity of the end of the upper base 2 away from the converter 5 is coaxially provided with a blocker 6, and the upper base 2 is provided with a one-way tooth ring 202 matched with the elastic pawl of the blocker 6, and the blocker 6 is threadedly connected with the screw push rod 3.

[0050] The blocker 6 has two functions:

[0051] I. When injecting, the screw rod 3 cannot rotate in motion, but its thread can drive the blocker 6 to rotate. The blocker 6 has a thread inside that matches the screw rod, and the edge is provided with a spring pawl. When the blocker 6 rotates, the spring pawl moves from one groove of the one-way ring gear 202 to another groove, producing a prompt sound;

[0052] II. When the screw rod 3 is assembled with the medicine bottle holder 9, it can only move towards the cartridge bottle 10. If there is a force in the opposite direction (such as the elastic force of the piston 11), the screw rod 3 has a tendency to drive the blocker 6 to rotate. The spring pawl of the blocker 6 is limited by the one-way ring gear 202 and cannot rotate in the opposite direction (ratchet and pawl mechanism design), so the reverse movement of the screw rod 3 is limited.

[0053] The hollow main body shell 101 is coaxially connected with the medicine bottle holder 9 at one end of the base 2, and the medicine bottle holder 9 is filled with the cartridge bottle 10. The outer thread of the injection end of the medicine bottle holder 9 is used to install the injection needle (similar to the existing insulin injection pen needle). The end of the screw rod 3 pointing to the cartridge bottle 10 is provided with a push rod disc 7 matched with the built-in piston 11 of the cartridge bottle 10. The medicine bottle holder 9 is provided with an observation hole for observing the use of the liquid medicine in the transparent cartridge bottle 10.

[0054] The outer wall of the metering regulator 4 is provided with an annular indicating groove, and the hollow main body shell 101 is provided with an observation window matched with the annular indicating groove. The outer wall of the hollow main body shell 101 is attached with a scale disc 13 matched with the observation window, and the scale disc 13 is provided with an observation port matched with the annular indicating groove. The scale corresponding to the annular indicating groove is observed through the observation port of the scale disc 13.

[0055] The adjusting inner cylinder 403 is coaxially inserted into the upper base 2, and the adjusting inner cylinder 403 extends out of the regulator tooth 404 matched with the base tooth 201 built in the upper base 2. When adjusting the single injection dose, rotate the metering regulator 4. A plurality of elastic arms 402 on the metering regulator 4 and the straight grooves of the upper base 2 are matched. After the metering regulator 4 stops rotating, its elastic arms 402 and the bottom of the straight grooves are automatically aligned. When the elastic arms 402 slide between the straight grooves, a clicking sound will be produced. The minimum single injection dose is the movement distance of the metering regulator 4 when the elastic arm 402 rotates through a single straight groove; the maximum single injection dose is the movement distance of the metering regulator 4 when the adjusting inner cylinder 403 is rotated to the position where the regulator tooth 404 clamps the base tooth 201. The end of the screw rod 3 away from the push rod disc 7 is provided with a blocking protrusion 302. For multiple injections, when the metering regulator 4 rotates and contacts the blocking protrusion 302 of the screw rod 3, the metering regulator 4 cannot rotate, which indicates that the liquid medicine in the cartridge bottle 10 is about to run out.

[0056] The lower base 15 is coaxially fixedly installed in the inner cavity of the hollow main body shell 101, and the inner cavity of the lower base 15 is provided with a pressing locking assembly 8 which is linearly slidably connected with the linear groove 301.

[0057] The pressing locking assembly 8 comprises an inner ring tooth connector 801 which is coaxially fixedly installed in the inner cavity of the lower base 15, the inner cavity of the lower base 15 is coaxially slidably installed with an anti-rotation piece 802 which is linearly slidably connected with the linear groove 301, the anti-rotation piece 802 is coaxially sleeved with a spring 803 which abuts against the inner ring tooth connector 801, and the anti-rotation piece 802 is provided with an outer ring tooth which is adaptively inserted with the inner ring tooth connector 801. The lower base 15 is threadedly connected with the medicine bottle support 9, and the edge of the cartridge bottle 10 presses the anti-rotation piece 802, and when the cartridge bottle 10 is separated from the anti-rotation piece 802, the outer ring tooth of the anti-rotation piece 802 is separated from the inner ring tooth of the inner ring tooth connector 801.

[0058] The medicine bottle support 9 is sleeved with a split pen cap 12, and the split pen cap 12 comprises a pen cap upper cover 121 which is annularly projected and clamped into the annular groove of the medicine bottle support 9, and the pen cap upper cover 121 is coaxially interference-fittingly connected with a pen cap lower cover 122.

[0059] Working principle:

[0060] In use, the medicine bottle support 9 is rotatably and tightly connected with the lower base 15, so that the edge of the cartridge bottle 10 presses the anti-rotation piece 802, the outer ring tooth of the anti-rotation piece 802 is inserted into the inner ring tooth of the inner ring tooth connector 801, the anti-rotation piece 802 cannot rotate together with the screw push rod 3, and the screw push rod 3 can only linearly move relative to the anti-rotation piece 802, then the needle which is communicated with the cartridge bottle 10 is screwed on the medicine bottle support 9, then the metering adjuster 4 is rotated, so that the annular indicating groove of the metering adjuster 4 is directed to the corresponding scale of single injection, at this time, the metering adjuster 4 is rotated relative to the converter 5, the metering adjuster 4 is screwingly moved relative to the screw push rod 3, the converter 5 is linearly moved relative to the screw push rod 3, then the converter 5 is pressed, at this time, the fixed step 501 of the converter 5 and the adjuster step 405 of the metering adjuster 4 are engaged, the metering adjuster 4 and the converter 5 cannot rotate relative to each other, and the metering adjuster 4 and the screw push rod 3 cannot move relative to each other, and the three parts (the screw push rod 3, the metering adjuster 4 and the converter 5) can only linearly move along the axial direction of the screw push rod 3, under the pressing and pushing, the screw push rod 3 pushes the piston 11 in the cartridge bottle 10 through the push rod disc 7 to perform injection;

[0061] After multiple injections, the metering regulator 4 rotates to contact the blocking protrusion 302 of the screw push rod 3, the metering regulator 4 cannot rotate, and the liquid in the cartridge 10 is about to run out. At this time, the medicine bottle support 9 can be unscrewed to refill the cartridge 10, and the screw push rod 3 is screwed back. At this time, the cartridge 10 is separated from the anti-rotation piece 802, and the outer ring teeth of the anti-rotation piece 802 are separated from the inner ring teeth of the inner ring teeth connector 801 under the elastic force of the spring 803. The anti-rotation piece 802 can rotate together with the screw push rod 3. Then press the push rod disc 7, the screw push rod 3 rotates relative to the push rod disc 7, the screw push rod 3 moves relative to the stopper 6 and the upper base 2, the screw push rod 3 moves linearly relative to the converter 5, the screw push rod 3 retracts into the hollow main body shell 101 and is reset. Then the medicine bottle support 9 and the lower base 15 can be reconnected by rotating and tightening.

[0062] Example Two

[0063] In this embodiment, the structure of the drug injection device is basically the same as that of Example One, except that:

[0064] The hollow main body shell 101 in Example One is replaced by an integrated main body shell 102, and the upper base 2 is coaxially connected in the inner wall of the integrated main body shell 102. The integrated main body shell 102 is directly connected with the linear slot 301 in linear sliding connection, and the pressing locking assembly 8 is not provided. The medicine bottle support 9 is coaxially connected with the integrated main body shell 102, and the threaded connection between the medicine bottle support 9 and the integrated main body shell 102 is not used in Example One. The annular protrusion of the medicine bottle support 9 is connected into the annular groove of the integrated main body shell 102.

[0065] The outer wall of the integrated main body shell 102 is provided with a scale table matched with the annular indicating groove, and the corresponding scale of the annular indicating groove is observed through the observation window of the integrated main body shell 102.

[0066] The split pen cap 12 in Example One is replaced by an integrated pen cap 14, and the medicine bottle support 9 is coaxially installed with the integrated pen cap 14, and the annular protrusion of the inner wall of the integrated pen cap 14 is connected into the annular groove of the medicine bottle support 9.

[0067] Working principle:

[0068] In this embodiment, the working principle of the drug injection device is basically the same as that of Example One, except that:

[0069] Since the integrated main body shell 102 is directly connected with the linear slot 301 in linear sliding connection, when the screw push rod 3 moves to the end of stroke, that is, the metering regulator 4 rotates to contact the blocking protrusion 302 of the screw push rod 3, the screw push rod 3 cannot be screwed back relative to the integrated main body shell 102. Meanwhile, since the integrated main body shell 102 and the integrated pen cap 14 are simple in structure, it is convenient for production, and the screw push rod 3 cannot be rotated back in this embodiment relative to the first embodiment, so this embodiment is a disposable adjustable dose drug injection device.

[0070] It should be noted that the above only illustrates the technical thought of the present application, and cannot limit the protection scope of the present application. For ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which all fall within the protection scope of the present application.

Claims

1. A variable dose medicine injection device comprising a body housing, characterised in that, One end cavity of the main body shell is coaxially provided with an upper base (2), the other end opening of the main body shell is slidably inserted with a metering regulator (4), one end outer wall of the upper base (2) is provided with a plurality of uniformly distributed straight grooves which are parallel to the axis of the upper base (2), the adjusting outer cylinder (401) of the metering regulator (4) is coaxially sleeved on one end of the upper base (2), and the end protrusions of a plurality of elastic arms (402) of the adjusting outer cylinder (401) are matched with the straight grooves, the adjusting inner cylinder (403) of the metering regulator (4) is threadedly connected with a screw push rod (3), the straight slot (301) of the screw push rod (3) is slidably connected with a converter (5), the outer end edge annular protrusion of the converter (5) is slidably matched with the end annular groove of the metering regulator (4), and the converter (5) is provided with a fixed step (501) matched with the annular regulator step (405) of the metering regulator (4), the end cavity of the upper base (2) away from the converter (5) is coaxially provided with a blocker (6), and the upper base (2) is provided with a one-way gear ring (202) matched with the elastic pawl of the blocker (6), the blocker (6) is threadedly connected with the screw push rod (3), the end cavity of the main body shell provided with the upper base (2) is linearly slidably connected with the straight slot (301), the outer wall of the metering regulator (4) is provided with an annular indicating groove, and the main body shell is provided with an observation window matched with the annular indicating groove; the end cavity of the main body shell provided with the upper base (2) is coaxially connected with a medicine bottle support (9), and the medicine bottle support (9) is filled with a cassette bottle (10), and one end of the screw push rod (3) pointing to the cassette bottle (10) is provided with a push rod disc (7) matched with an inner piston (11) of the cassette bottle (10).

2. A device as claimed in claim 1, wherein, The adjusting inner cylinder (403) is coaxially inserted into the upper base (2), and the adjusting inner cylinder (403) extends out of the adjusting inner cylinder (403) matched with the base pawl (201) of the upper base (2), and the adjusting inner cylinder (403) is matched with the base pawl (201) of the upper base (2).

3. A device according to claim 1, wherein, The main body shell is a hollow main body shell (101), the inner cavity of the hollow main body shell (101) is coaxially fixedly provided with a lower base (15), and the inner cavity of the lower base (15) is provided with a pressing locking assembly (8) linearly slidably connected with the straight slot (301), and the upper base (2) is coaxially connected with the lower base (15).

4. A device as claimed in claim 3, wherein the dose setting member is a rotatable dose setting member. The pressing locking assembly (8) comprises: an inner ring tooth connector (801) coaxially fixedly installed in the inner cavity of the lower base (15), the inner cavity of the lower base (15) is coaxially slidably provided with an anti-rotation piece (802) linearly slidably connected with the straight slot (301), the anti-rotation piece (802) is coaxially sleeved with a spring (803) abutting against the inner ring tooth connector (801), and the anti-rotation piece (802) is provided with an outer ring tooth matched with the inner ring tooth connector (801) for plug-in connection.

5. A device as claimed in claim 4, wherein the dose setting member is a rotatable dose setting member. 5 The lower base (15) is threadedly connected with the medicine bottle support (9), the edge of the card type bottle (10) presses the anti-rotation member (802), and when the card type bottle (10) is separated from the anti-rotation member (802), the outer ring teeth of the anti-rotation member (802) are separated from the inner ring teeth of the inner ring teeth connector (801).

6. A device according to claim 3, wherein the dose setting member is a rotatable dose knob. The medicine bottle support (9) is sleeved with a split pen cap (12), the split pen cap (12) comprises a pen cap upper cover (121) with an inner wall annular protrusion clamped into a ring-shaped groove of the medicine bottle support (9), and the pen cap upper cover (121) is coaxially connected with a pen cap lower cover (122) in interference fit.

7. A device according to claim 3, wherein the dose setting member is a rotatable dose knob. The outer wall of the hollow main body shell (101) is attached with a scale disc (13) matched with an observation window, and the scale disc (13) is provided with an observation port matched with an annular indicating groove.

8. A device according to claim 1, wherein, The main body shell is an integrated main body shell (102), the upper base (2) is coaxially clamped in the inner wall of the integrated main body shell (102), the integrated main body shell (102) is linearly and slidingly connected with the linear groove (301), and the medicine bottle support (9) is coaxially clamped with the integrated main body shell (102).

9. A device as claimed in claim 8, wherein, The medicine bottle support (9) is coaxially installed with an integrated pen cap (14), and the inner wall of the integrated pen cap (14) is clamped into a ring-shaped groove of the medicine bottle support (9).

10. A device according to claim 8, wherein the dose setting member is a rotatable dose knob. The outer wall of the integrated main body shell (102) is provided with a scale matched with an annular indicating groove.

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