Dose-adjustable reusable mechanical injection pen

Abstract

The utility model relates to an injection pen, in particular to a dose-adjustable reusable mechanical injection pen which comprises a pen container, a medicine bin is arranged on one side of the pen container, a screw rod pushed into the medicine bin is arranged in the pen container, and a free orientation block for preventing the screw rod from rotating is arranged at the end of the pen container. The pen container is further internally provided with a scale push rod assembly used for driving the screw to move, the scale push rod assembly comprises a transmission rotary drum which rotates in the pen container to form reciprocating motion, and the transmission rotary drum and the directional transmission sleeve are in linkage through matching of a guide groove and a guide block. When the medicine bin is screwed into the pen container, the directional transmission sleeve is driven by the transmission rotary drum so as to drive the screw rod to advance, finally, the medicine bottle rubber plug is pushed to complete the medicine feeding action, compared with an injection pen in the market, many parts and structures are simplified, and the injection pen further has the advantages of being simple in structure, convenient to machine, easy to assemble and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of injection pens, in particular to a kind of dose-adjustable reusable mechanical injection pen. BACKGROUND

[0002] Diabetes is caused by insulin absolute or relative secretion deficiency and utilization barrier, and patient reaches treatment purpose by injecting insulin, there are many mechanical injection pens on the market, such as the publication No. CN104736188A, the name called "spring-driven injection device" is also so, more famous in industry, such as Lirui or Novo-nordisk company, the structure of their injection pen is very complex, the price is very high, how to make a simple and easy-to-use injection pen is the technical problem that we solve at present. UTILITY MODEL CONTENT

[0003] In view of the existing technical deficiencies, the utility model provides a kind of dose-adjustable reusable mechanical injection pen.

[0004] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is: a kind of dose-adjustable reusable mechanical injection pen, characterized by including pen barrel, the side of pen barrel is equipped with medicine bin, the screw rod that is arranged in pen barrel is equipped with the screw rod that is arranged in pen barrel, the end of pen barrel is equipped with the free directional block that prevents the rotation of screw rod, pen barrel is also equipped with scale push rod assembly for driving screw rod movement, scale push rod assembly includes the transmission rotating cylinder that is formed reciprocating motion by rotating in pen barrel, the side of transmission rotating cylinder is equipped with guide groove, the directional transmission sleeve that is connected with screw rod and is rotationally matched with pen barrel is arranged outside screw rod, directional transmission sleeve is equipped with the guide block that cooperates with guide groove, when screw rod is limited to rotate by free directional block, transmission rotating cylinder and directional transmission sleeve are linked by the cooperation of guide groove and guide block, and the advance of screw rod is realized by the rotation of transmission rotating cylinder.

[0005] The transmission rotating cylinder is equipped with scale sleeve for setting the advance amount of screw rod, the visible window that cooperates with scale sleeve is arranged on pen barrel, scale sleeve is connected with pen barrel by screw thread, and scale sleeve realizes reciprocating motion along the axial direction of pen barrel by relative rotation with pen barrel.

[0006] The first tooth for linkage transmission rotating cylinder is arranged on scale sleeve, the second tooth that cooperates with first tooth is arranged on transmission rotating cylinder, the injection button that forces first tooth and second tooth to engage and pushes transmission rotating cylinder is arranged at one end of pen barrel, injection button is rotationally connected to scale sleeve, when injection button presses transmission rotating cylinder into pen barrel, transmission rotating cylinder and scale sleeve are linked by the cooperation of first tooth and second tooth, transmission rotating cylinder moves along the axial direction of pen barrel with scale sleeve, and relative rotation with pen barrel is realized.

[0007] The injection button is rotationally connected to the button transmission seat, and the injection button is driven by the button transmission seat to the transmission drum.

[0008] The upper part of the button transmission seat is provided with a first elastic arm, and the inner wall of the scale sleeve is provided with a plurality of first type grooves matched with the first elastic arm.

[0009] The upper part of the button transmission seat is provided with a first elastic arm, and the inner wall of the scale sleeve is provided with a plurality of first type grooves matched with the first elastic arm.

[0010] The scale sleeve is internally provided with an elastic device for preventing the first tooth from engaging with the second tooth.

[0011] The end of the pen barrel and relative to the position of the medicine cartridge is provided with a free directional block rotationally matched with the pen barrel, the free directional block is provided with a clamping groove for preventing the screw rod from rotating, the medicine cartridge is fixedly connected with the pen barrel through threaded connection, one end of the medicine cartridge is provided with a third tooth for preventing the free directional block from rotating, the free directional block is provided with a fourth tooth matched with the third tooth, when the medicine cartridge is assembled in the pen barrel, the free directional block is limited through the cooperation of the third tooth and the fourth tooth, and the screw rod is rotationally limited through the cooperation of the free directional block.

[0012] The end of the screw rod is provided with a push piece for facilitating pushing into the medicine cartridge, and the push piece is rotationally connected to the screw rod.

[0013] One side of the free directional block is provided with a ratchet sleeve connecting block rotationally matched with the end of the directional transmission sleeve, the ratchet sleeve connecting block is provided with a plurality of ratchet teeth, the directional transmission sleeve is provided with an elastic arm claw matched with the ratchet teeth, and the ratchet sleeve connecting block and the directional transmission sleeve are rotationally limited through the elastic arm claw switching different ratchet teeth.

[0014] The utility model discloses the transmission drum and directional transmission sleeve are set up in the pen barrel, when the medicine cartridge is rotated into the pen barrel, the directional transmission sleeve is driven through the transmission drum to drive the advance of the screw rod, and finally the advance of the medicine bottle rubber plug completes the dosing action, compared with the injection pen on the market, a plurality of parts and structure are simplified, the utility model discloses still have the characteristics of simple structure, processing is convenient and easy to assemble, and the practicality is strong. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Structure diagram of the utility model;

[0016] Figure 2 Structure exploded view of the utility model;

[0017] Figure 3 Structure diagram of the utility model; Figure 2 Enlarged view of A in the middle;

[0018] Figure 4 Structure exploded view of the utility model cooperation between scale sleeve, transmission rotating cylinder, injection button and button transmission seat;

[0019] Figure 5 Sectional view of the utility model;

[0020] Figure 6 Structure diagram of the utility model; Figure 6 Enlarged view of B in the middle;

[0021] Figure 7 Structure diagram of the utility model; Figure 6 Enlarged view of C in the middle;

[0022] Figure 8 Structure diagram of the utility model after pulling out scale push rod assembly;

[0023] Figure 9 Structure diagram of the utility model when advancing scale push rod assembly;

[0024] Figure 10 Structure diagram of the utility model pen container Figure 1 ;

[0025] Figure 11 Structure diagram of the utility model pen container Figure 2 ;

[0026] Figure 12 Structure diagram of the utility model scale sleeve;

[0027] Figure 13 Structure diagram of the utility model directional transmission sleeve;

[0028] Figure 14 Structure diagram of the utility model medicine bin;

[0029] Figure 15 Structure diagram of the utility model transmission sleeve;

[0030] Figure 16 Structure diagram of the utility model free directional block;

[0031] Figure 17The utility model discloses button drive seat's structure schematic drawing.

[0032] Figure 18 The utility model discloses ratchet sleeve connecting block's structure schematic drawing.

[0033] Figure 19 The utility model discloses injection button's structure schematic drawing. Specific implementation

[0034] As Figures 1-19 The utility model discloses a dose adjustable reusable mechanical injection pen, which comprises a pen barrel 100, a medicine bin 200 arranged on one side of the pen barrel 100, a screw rod 300 arranged in the pen barrel 100 and used for pushing into the medicine bin 200, a free orientation block 110 arranged at the end of the pen barrel 100 and used for preventing the screw rod 300 from rotating, a scale push rod assembly 400 arranged in the pen barrel 100 and used for driving the screw rod 300 to move, the scale push rod assembly 400 comprising a transmission rotating cylinder 410 which is formed to reciprocate through rotation in the pen barrel 100, a guide groove 411 arranged on the side of the transmission rotating cylinder 410, a directional transmission sleeve 310 arranged outside the screw rod 300 and threadedly connected with the screw rod 300 and rotationally matched with the pen barrel 100, a guide block 311 arranged on the directional transmission sleeve 310 and matched with the guide groove 411, when the screw rod 300 is limited from rotating through the free orientation block 110, the transmission rotating cylinder 410 and the directional transmission sleeve are linked through cooperation of the guide groove 411 and the guide block 311, and the screw rod 300 is pushed through rotation of the transmission rotating cylinder 410, the medicine bin 200 is used for loading a medicine bottle 220, the directional transmission sleeve 310 is provided with a first screw thread 313 matched with the screw rod 300, when the screw rod 300 is stuck and cannot rotate through the free orientation block 110, the directional transmission sleeve 310 is rotated to push the screw rod 300 out of the pen barrel 100 through the first screw thread 313, in order to meet the sanitary requirement, the medicine bin 200 is further provided with a pen cap 230, and the specific use method of the injection pen is shown in the following.

[0035] The transmission rotating cylinder 410 is provided with a scale sleeve 420 used for setting the pushing amount of the screw rod 300, the pen barrel 100 is provided with a visible window 140 matched with the scale sleeve 420, the scale sleeve 420 is threadedly connected with the pen barrel 100, the scale sleeve 420 is reciprocated along the axial direction of the pen barrel 100 through relative rotation with the pen barrel 100, the scale sleeve 420 is marked with units of injection medicine, and the visible window 140 is used for conveniently observing the scale of the scale sleeve 420.

[0036] The first tooth 421 on the scale sleeve 420 is used to drive the rotating drum 410, the second tooth 412 on the rotating drum 410 is used to cooperate with the first tooth 421, one end of the pen barrel 100 is provided with an injection button 430 to force the first tooth 421 to engage with the second tooth 412 and push the rotating drum 410, the injection button 430 is rotationally connected to the scale sleeve 420, when the injection button 430 pushes the rotating drum 410 into the pen barrel 100, the rotating drum 410 and the scale sleeve 420 are driven by the cooperation of the first tooth 421 and the second tooth 412, the rotating drum 410 moves along the axial direction of the pen barrel 100 and rotates relative to the pen barrel 100, the function of the injection button 430 is to push the rotating drum 410 and the scale sleeve 420, and in the process of pushing, the first tooth 421 and the second tooth 412 are engaged, so that the rotating drum 410 and the scale sleeve 420 are driven, and the scale sleeve 420 is provided with a second screw thread 425 matched with the scale sleeve 420, so when the injection button 430 is pressed into the pen barrel 100, the rotating drum 410 is first driven, the rotating drum 410 and the scale sleeve 420 are driven, the scale sleeve 420 is rotated into the pen barrel 100 by the cooperation of the second screw thread 425, and the rotating drum 410 is also rotated and retracted into the pen barrel 100.

[0037] The injection button 430 and the rotating drum 410 are provided with a button driving seat 440, the button driving seat 440 is rotationally connected to the scale sleeve 420, the injection button 430 is rotationally connected to the button driving seat 440, and the injection button 430 is driven by the button driving seat 440 to the rotating drum 410.

[0038] The upper part of the button driving seat 440 is provided with a first elastic arm 441, the inner wall of the scale sleeve 420 is provided with a plurality of first type grooves 422 matched with the first elastic arm 441, the button driving seat 440 and the scale sleeve 420 are switched by the first elastic arm 441 to form a gear type rotational cooperation; the lower part of the button driving seat 440 is provided with a second elastic arm 442, the inner wall of the rotating drum 410 is provided with a plurality of second type grooves 413 matched with the second elastic arm 442, the button driving seat 440 and the rotating drum 410 are switched by the second elastic arm 442 to form a gear type rotational cooperation, the cooperation of the first elastic arm 441 and the first type groove 422 and the cooperation of the second elastic arm 442 and the second type groove 413 make the scale sleeve 420 and the rotating drum 410 have a sound feedback during rotation.

[0039] The scale sleeve 420 is provided with a flange 423 to prevent the button transmission seat 440 from being separated from the scale sleeve 420. The button transmission seat 440 is provided with a positioning column 443. The injection button 430 is provided with a groove 431 matched with the positioning column 443. The injection button 430 is rotationally matched with the button transmission seat 440 by the positioning column 443 clamped into the groove 431. The positioning column 443 is provided with a retreat-preventing portion 444 to prevent the injection button 430 from being separated from the button transmission seat 440. The groove 431 is provided with a limiting groove 432 matched with the retreat-preventing portion 444.

[0040] The scale sleeve 420 is provided with an elastic device 424 to prevent the first tooth 421 from being engaged with the second tooth 412. The elastic device 424 preferably adopts a spring structure, which is convenient to assemble and low in cost. The addition of the elastic device 424 makes the scale sleeve 420 and the transmission drum 410 not be linked when the injection button 430 is not pressed.

[0041] The end of the pen barrel 100 and the position relative to the cartridge 200 are provided with a free orientation block 110 rotationally matched with the pen barrel 100. The free orientation block 110 is provided with a clamping groove 111 to prevent the screw rod 300 from rotating. The cartridge 200 is fixedly connected with the pen barrel 100 in a threaded manner. One end of the cartridge 200 is provided with a third tooth 210 to prevent the free orientation block 110 from rotating. The free orientation block 110 is provided with a fourth tooth 112 matched with the third tooth 210. When the cartridge 200 is assembled in the pen barrel 100, the free orientation block 110 is limited by the cooperation of the third tooth 210 and the fourth tooth 112. The screw rod 300 is rotationally limited by the cooperation of the free orientation block 110. The cross section of the screw rod 300 is designed to be special-shaped, such as the flat segments at both ends in the drawings of the present application, which is equivalent to a square cross section. In this way, the clamping groove 111 can clamp the screw rod 300 to prevent it from rotating. The cartridge 200 and the pen barrel 100 are connected in a threaded manner, which is stable and reliable.

[0042] The end of the screw rod 300 is provided with a push piece 320 to facilitate pushing into the cartridge 200. The push piece 320 is rotationally connected to the screw rod 300. The push piece 320 increases the head area of the screw rod 300, which facilitates pushing the rubber plug 221 in the medicine bottle 220.

[0043] One side of the free orientation block 110 is provided with a ratchet sleeve connecting block 120 which is rotationally matched with the end of the orientation transmission sleeve 310, the ratchet sleeve connecting block 120 is provided with a plurality of ratchet teeth 121, the orientation transmission sleeve 310 is provided with a spring arm claw 312 matched with the ratchet teeth 121, the ratchet sleeve connecting block 120 and the orientation transmission sleeve 310 form rotation limit through switching different ratchet teeth 121, the ratchet teeth 121 and the spring arm claw 312 make the orientation transmission sleeve 310 only rotate in one direction, avoiding the risk of liquid leakage, every rotation unit, the spring arm claw 312 at the front end of the orientation transmission sleeve 310 completes the ratchet teeth 121 jumping in the ratchet sleeve connecting block 120, thereby emitting a crisp prompt sound, the ratchet sleeve connecting block 120 is provided with a convex block 122 which prevents the relative rotation of the ratchet sleeve connecting block 120 and the pen barrel 100, the pen barrel 100 is provided with a cutting groove 130 matched with the convex block 122.

[0044] Method for use:

[0045] For the convenience of understanding the present application, the structure is divided into three parts, the first part is the medicine bin 200, the second part is the pen barrel 100, and the third part is the scale push rod assembly 400, in short, the injection button 430 controls the linkage of the transmission rotating drum 410 and the scale sleeve 420, and the opening and closing are realized by pressing the injection button 430, the free orientation block 110 is used to limit the rotation of the screw rod 300, when the medicine bin 200 is installed, the screw rod 300 will be limited in rotation by the free orientation block 110, when the medicine bin 200 is removed, the screw rod 300 can rotate, which is convenient for recovering the screw rod 300.

[0046] Before use, first install the medicine bottle 220 into the medicine chamber 200, and then install the medicine chamber 200 into the pen barrel 100. The third tooth 210 cooperates with the fourth tooth 112 to limit the rotation of the free directional block 110, the clamping slot 111 on the free directional block 110 limits the rotation of the screw rod 300, and the screw rod 300 can only move linearly along the axial direction of the pen barrel 100. At this time, the operator rotates the hand wheel 426 on the scale sleeve 420 and observes the required dose on the visual window 140. When the needle is inserted into the human body, the injection button 430 can be pressed. Since the injection button 430 is pressed against the transmission drum 410 through the button transmission seat 440, the first tooth 421 engages with the second tooth 412 during the pressing process. The transmission drum 410 and the scale sleeve 420 are linked. During the process of continuously pressing the injection button 430, the transmission drum 410 spirally moves into the pen barrel 100 along with the scale sleeve 420, and in this process, the guide block 311 cooperates with the guide slot 411 to link the transmission drum 410 with the directional transmission sleeve 310, and the directional transmission sleeve 310 also rotates. Due to the relationship between the first screw thread 313 in the directional transmission sleeve 310 and the directional transmission sleeve 310, the screw rod 300 and the directional transmission sleeve 310 rotate relative to each other. At this time, the screw rod 300 cannot rotate, so the screw rod 300 can only move linearly along the axial direction of the pen barrel 100. The screw rod 300 advances towards the medicine chamber 200 to complete the drug delivery action. When the set dose is finished, the scale sleeve 420 is completely retracted into the pen barrel 100, waiting for the next injection operation.

[0047] When the screw rod 300 is completely extended out of the pen barrel 100, it means that the medicine bottle 220 needs to be replaced. At this time, the medicine chamber 200 is removed from the pen barrel 100, the free directional block 110 can rotate freely, and the screw rod 300 can also rotate. Pressing the push piece 320 makes the screw rod 300 retract into the pen barrel 100 to wait for injection.

[0048] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples. The above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, simple changes and substitutions made by those skilled in the art are within the scope of protection of the present application.

Claims

1. A dose adjustable, reusable mechanical injection pen characterized in that, The application relates to a pen barrel (100) provided with a medicine bin (200) on one side, a screw rod (300) arranged in the pen barrel (100) and capable of pushing forward in the medicine bin (200), a free orientation block (110) arranged at the end of the pen barrel (100) and capable of preventing the screw rod (300) from rotating, a scale push rod assembly (400) arranged in the pen barrel (100) and capable of driving the screw rod (300) to move, the scale push rod assembly (400) comprising a transmission rotating cylinder (410) capable of forming reciprocating motion through rotation in the pen barrel (100), the side of the transmission rotating cylinder (410) being provided with a guide groove (411), the screw rod (300) being provided with a directional transmission sleeve (310) which is threadedly connected with the screw rod (300) and rotationally matched with the pen barrel (100), the directional transmission sleeve (310) being provided with a guide block (311) matched with the guide groove (411), when the screw rod (300) is limited from rotating by the free orientation block (110), the transmission rotating cylinder (410) and the directional transmission sleeve are linked through cooperation of the guide groove (411) and the guide block (311), and the screw rod (300) is pushed forward through rotation of the transmission rotating cylinder (410).

2. A dose adjustable, reusable mechanical injection pen according to claim 1, wherein, The transmission rotating cylinder (410) is provided with a scale sleeve (420) for setting the pushing amount of the screw rod (300), the pen barrel (100) is provided with a visible window (140) matched with the scale sleeve (420), the scale sleeve (420) is threadedly connected with the pen barrel (100), and the scale sleeve (420) is reciprocated along the axial direction of the pen barrel (100) through relative rotation with the pen barrel (100).

3. A dose adjustable, reusable mechanical injection pen according to claim 2, wherein, The scale sleeve (420) is provided with a first tooth (421) for linking the transmission rotating cylinder (410), the transmission rotating cylinder (410) is provided with a second tooth (412) matched with the first tooth (421), one end of the pen barrel (100) is provided with an injection button (430) for forcing the first tooth (421) to mesh with the second tooth (412) and pushing the transmission rotating cylinder (410), the injection button (430) is rotationally connected with the scale sleeve (420), when the injection button (430) presses the transmission rotating cylinder (410) into the pen barrel (100), the transmission rotating cylinder (410) and the scale sleeve (420) are linked through cooperation of the first tooth (421) and the second tooth (412), the transmission rotating cylinder (410) moves along the axial direction of the pen barrel (100) with the scale sleeve (420) and is relatively rotated with the pen barrel (100).

4. A dose adjustable, reusable mechanical injection pen according to claim 3, wherein, The injection button (430) and the transmission rotating cylinder (410) are provided with a button transmission seat (440), the button transmission seat (440) is rotationally connected with the scale sleeve (420), the injection button (430) is rotationally connected with the button transmission seat (440), and the injection button (430) is transmitted to the transmission rotating cylinder (410) through the button transmission seat (440).

5. A dose adjustable, reusable mechanical injection pen according to claim 4, wherein, The upper part of the button transmission seat (440) is provided with a first elastic arm (441), the inner wall of the scale sleeve (420) is provided with a plurality of first type grooves (422) matched with the first elastic arm (441), the button transmission seat (440) and the scale sleeve (420) are switched by the first elastic arm (441) to form gear type rotary cooperation.

6. A dose adjustable, reusable mechanical injection pen according to claim 5, wherein, The scale sleeve (420) is provided with a flange (423) for preventing the button transmission seat (440) from being separated from the scale sleeve (420), the center of the button transmission seat (440) is provided with a positioning column (443), the injection button (430) is provided with a groove (431) matched with the positioning column (443), the injection button (430) and the button transmission seat (440) are rotationally connected by the positioning column (443) clamped into the groove (431), the positioning column (443) is provided with a retreat stop portion (444) for preventing the injection button (430) from being separated from the button transmission seat (440), the groove (431) is provided with a limiting groove (432) matched with the retreat stop portion (444).

7. A dose adjustable, reusable mechanical injection pen according to claim 4, wherein, The scale sleeve (420) is provided with an elastic device (424) for preventing the first tooth (421) from engaging with the second tooth (412).

8. A dose adjustable, reusable mechanical injection pen according to any one of claims 1 to 7, wherein, The end of the pen barrel (100) and relative to the position of the cartridge (200) is provided with a free directional block (110) rotationally connected with the pen barrel (100), the free directional block (110) is provided with a clamping groove (111) for preventing the screw rod (300) from rotating, the cartridge (200) is fixedly connected with the pen barrel (100) by screwing, one end of the cartridge (200) is provided with a third tooth (210) for preventing the free directional block (110) from rotating, the free directional block (110) is provided with a fourth tooth (112) matched with the third tooth (210), when the cartridge (200) is assembled in the pen barrel (100), the free directional block (110) is limited by the cooperation of the third tooth (210) and the fourth tooth (112), the screw rod (300) is rotationally limited by the cooperation of the free directional block (110).

9. A dose adjustable, reusable mechanical injection pen according to claim 8, wherein, The end of the screw rod (300) is provided with a push piece (320) for facilitating pushing into the cartridge (200), the push piece (320) is rotationally connected with the screw rod (300).

10. A dose adjustable, reusable mechanical injection pen according to claim 9, wherein, One side of the free directional block (110) is provided with a ratchet sleeve connecting block (120) rotationally connected with the end of the directional transmission sleeve (310), the ratchet sleeve connecting block (120) is provided with a plurality of ratchet teeth (121), the directional transmission sleeve (310) is provided with an elastic arm claw (312) matched with the ratchet teeth (121), the ratchet sleeve connecting block (120) and the directional transmission sleeve (310) are switched by the elastic arm claw (312) to form rotary limiting.

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