Disposable adjustable injection pen

Abstract

The utility model provides a disposable adjustable injection pen, comprising a medicine bin, an injection mechanism, and a pen cap. The injection mechanism comprises: a pen barrel, a scale sleeve, a pressing head, a transmission rotating cylinder, an engaging transmission block, and a screw rod. The transmission rotating cylinder is arranged in the scale sleeve, and a transmission member that cooperates with the transmission part is arranged between the transmission rotating cylinder and the scale sleeve. The engaging transmission block is connected and fixed to the pen barrel, and the engaging transmission block is provided with a threaded hole that penetrates the body; the screw rod is threadedly connected in the threaded hole of the engaging transmission block and one end of the screw rod extends into the medicine bin, and a directional transmission sleeve that is movable in the rotation direction and axial direction is connected to the screw rod, and the screw rod can move axially relative to the directional transmission sleeve, and one end of the directional transmission sleeve is movably clamped in the engaging transmission block or the pen barrel or between the engaging transmission block and the pen barrel; compared with the prior art, the utility model has a relatively simple structure and lower cost, and has smaller resistance to exciting the injection button and smaller pushing resistance during injection.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical appliances, in particular to an injection pen. Background Art

[0002] The mechanical injection pens currently on the market have complex structural designs, and the injection button activation resistance and injection push resistance are both large, making them inconvenient to use. For example, the fine-tuning injection pen disclosed in publication number CN107308523A has many parts and a very complex structure, resulting in high production costs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an injection pen with a simple structure.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A disposable adjustable injection pen comprises a medicine chamber, an injection body connected to the medicine chamber and provided with an injection mechanism therein, and a pen cap sleeved outside the medicine chamber, wherein the injection mechanism comprises:

[0006] A pen barrel, wherein both ends of the pen barrel are connected and a mounting chamber is built in the pen barrel, and a spiral groove or a spiral protrusion is provided on the inner wall of the pen barrel;

[0007] The graduated sleeve is provided with a spiral protrusion or a spiral groove on the outside of the graduated sleeve, and matches with the spiral groove or the spiral protrusion in the pen barrel to form a spiral rotation fit. The graduated sleeve is a hollow structure, one end of which is embedded in the pen barrel, and a transmission part is provided at the end;

[0008] A pressing head, the pressing head is connected to the end of the scale sleeve, and when the scale sleeve is rotating, the end of the pressing head and the hand pressing position are in a stationary state;

[0009] The transmission drum is arranged in the scale sleeve, and a transmission member that cooperates with the transmission part is arranged between the transmission drum and the scale sleeve, and the transmission drum is a hollow structure;

[0010] An engaging transmission block, the engaging transmission block is connected and fixed to the pen holder, and the engaging transmission block is provided with a threaded hole penetrating the body;

[0011] A screw rod, the screw rod is threadedly connected to the threaded hole of the meshing transmission block and one end of the screw rod extends into the medicine bin, a directional transmission sleeve movable in the rotational direction and the axial direction is connected to the screw rod, the screw rod can move axially relative to the directional transmission sleeve, and one end of the directional transmission sleeve is movably clamped in the meshing transmission block or the pen barrel or between the meshing transmission block and the pen barrel;

[0012] When the pressing head is continuously pressed, the scale sleeve rotates downward to drive the transmission drum to rotate through the transmission member, and then the transmission drum drives the directional transmission sleeve to rotate, driving the screw to rotate and move downward to squeeze the medicine in the medicine chamber.

[0013] The medicine bin and the pen holder are connected via an engaging transmission block, and two ends of the engaging transmission block are respectively buckled and connected with the medicine bin and the pen holder.

[0014] Preferably, a first ratchet gear is provided on the inner wall of the meshing transmission block facing one end of the directional transmission sleeve, and a first elastic pawl matching the first ratchet gear is provided on the outer edge of the directional transmission sleeve. After the first elastic pawl of the directional transmission sleeve cooperates with the gear teeth of the meshing transmission block, the directional transmission sleeve is restricted to rotate in a directional manner.

[0015] Preferably, a second ratchet wheel tooth is provided at the connection between the scale sleeve and the transmission member, and a part of the transmission member is provided with a second elastic pawl matching with the second ratchet wheel tooth of the scale sleeve.

[0016] Preferably, a third ratchet wheel tooth is provided at the connection between the transmission drum and the transmission member, and a part of the transmission member is provided with a third elastic pawl matching with the third ratchet wheel tooth of the transmission drum.

[0017] Preferably, the pressing head includes an injection button and a button transmission seat, a hollow mounting column is provided in the injection button, one end of the button transmission seat is inserted into the mounting column of the injection button, and after insertion, the injection button can rotate relative to the button transmission seat, and a limiting mechanism is provided between the mounting column and the button transmission seat to limit the injection button from falling out.

[0018] Preferably, the button transmission seat is fixed or rotatably clamped on the top of the scale sleeve, and the limiting mechanism includes a radially outwardly protruding annular bulge provided on the part of the button transmission seat inserted into the mounting column, a stop bulge with a spacing smaller than the diameter of the annular bulge is provided at the mouth of the mounting column, and a groove is axially provided at the mouth of the mounting column to allow the mounting columns on both sides of the groove to extend and retract.

[0019] Preferably, the inner top surface of one end of the transmission drum connected to the transmission member is provided with end face teeth, and the corresponding transmission member is provided with latch teeth that mesh with the end face teeth on the transmission drum.

[0020] Preferably, the outer surface of the transmission drum is provided with an external thread, and a limit block is threadedly connected to the transmission drum, and a rotation limiting mechanism for limiting the rotation of the limit block is provided between the limit block and the inner wall of the scale sleeve.

[0021] Preferably, the rotation limiting mechanism includes a clamping block provided on the outer edge of the limit block and a straight groove provided on the inner wall of the scale sleeve, the clamping block of the limit block is clamped in the straight groove of the scale sleeve, and when the scale sleeve rotates, the limit block is driven to move upward.

[0022] The beneficial effects of the utility model are as follows: the utility model drives the scale sleeve to rotate and move downward by driving the injection button, thereby driving the transmission drum to rotate through the transmission member, and the rotation of the transmission drum drives the internal directional transmission sleeve and the screw to rotate, and the linear motion of the screw can be achieved by arranging a component threadedly connected to the screw on the pen barrel. Compared with the existing technical structure, this structure is relatively simple and has lower cost, has less resistance to exciting the injection button, and has smaller pushing resistance during injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded view of the structure of the utility model;

[0024] Figure 2 It is a cross-sectional view of the utility model in a non-injection state;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 It is a cross-sectional view of the utility model after injection;

[0027] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0028] Figure 6 It is a structural schematic diagram of a transmission part;

[0029] Figure 7 It is a schematic diagram of the structure of the injection button;

[0030] Figure 8 It is a structural schematic diagram of a button transmission seat;

[0031] Fig. 9 It is a structural schematic diagram of a scale sleeve;

[0032] Fig.10 It is a schematic diagram of the structure of the pen holder;

[0033] Fig.11 It is a structural schematic diagram of the transmission drum;

[0034] Fig.12 It is a structural schematic diagram of the limit block;

[0035] Fig.13 is a schematic diagram of the structure of the screw;

[0036] Fig.14 It is a structural schematic diagram of a directional transmission sleeve;

[0037] Fig.15 It is a structural schematic diagram of the meshing transmission block. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Example

[0040] See also Figure 1-Figure 15, as shown in the figure, is a disposable adjustable injection pen, comprising a medicine chamber 1, an injection body 2 connected to the medicine chamber 1 and provided with an injection mechanism 2-1, and a pen cap 3 sleeved outside the medicine chamber 1, wherein the injection mechanism 2-1 comprises a pen barrel 2-1-1, a scale sleeve 2-1-2, a pressing head 2-1-3, a transmission rotating cylinder 2-1-4, an engaging transmission block 2-1-5, a screw 2-1-6 and a directional transmission sleeve 2-1-7, wherein both ends of the pen barrel 2-1-1 are connected and a mounting chamber is built in. In this embodiment, the inner wall of the pen barrel 2-1-1 is provided with a spiral protrusion 2-1-1-1, and the scale sleeve 2-1-2 The outer spiral groove 2-1-2-1 matches with the spiral protrusion 2-1-1-1 in the pen barrel 2-1-1 to form a spiral track. The scale sleeve 2-1-2 is a hollow structure, one end of which is embedded in the pen barrel 2-1-1, and a transmission part 2-1-2-2 is provided at the end. The transmission cylinder 2-1-4 is arranged in the scale sleeve 2-1-2, and a transmission member 4 is provided between the transmission cylinder 2-1-4 and the scale sleeve 2-1-2 to cooperate with the transmission part 2-1-2-2. The transmission between the transmission cylinder 2-1-4 and the scale sleeve 2-1-2 is through the transmission member 4. The transmission cylinder 2-1-4 and the scale sleeve 2-1-2 are driven by the transmission member 4. 4 is a hollow structure, and a directional transmission sleeve 2-1-7 is arranged inside. The screw 2-1-6 and the directional transmission sleeve 2-1-7 are movably matched in the rotation direction and the axial direction. The screw 2-1-6 can move axially relative to the directional transmission sleeve 2-1-7. In this embodiment, one end of the directional transmission sleeve 2-1-7 is movably connected to the meshing transmission block 2-1-5, and the pressing head 2-1-3 is connected to the end of the scale sleeve 2-1-2. When the scale sleeve 2-1-2 rotates, the end of the pressing head 2-1-3 and the hand pressing position are in a stationary state, and the meshing transmission block 2-1- 5 is connected and fixed with the pen holder 2-1-1, the meshing transmission block 2-1-5 is provided with a threaded hole 2-1-5-1 penetrating the body, the screw 2-1-6 is threadedly connected in the threaded hole 2-1-5-1 of the meshing transmission block 2-1-5 and one end extends into the medicine bin 1, when the pressing head 2-1-3 is continuously pressed, the scale sleeve 2-1-2 rotates and moves downward to drive the transmission drum 2-1-4 to rotate through the transmission member 4, and then the directional transmission sleeve 2-1-7 is driven to rotate through the transmission drum 2-1-4 to drive the screw 2-1-6 to rotate and move downward to squeeze the medicine in the medicine bin 1 to achieve injection. The working principle of this embodiment is: by pressing the pressing head, the pressing head pushes the scale sleeve, and when the scale sleeve moves downward, due to the setting of the spiral protrusion and the spiral groove, the scale sleeve is forced to rotate downward in the pen barrel. When the scale sleeve rotates, the transmission drum is driven to rotate through the transmission member, and the transmission drum drives the internal directional transmission sleeve to rotate when it rotates. The rotation of the directional transmission sleeve drives the screw to rotate. The screw is threadedly connected to the meshing transmission block, and the meshing transmission block is fixed to the medicine chamber and the pen barrel. Therefore, when the screw rotates, it will move downward to realize the injection function.In this embodiment, when the pressing head is pressed to drive the scale sleeve to move downward and rotate, the rotation direction is defined as right-handed.

[0041] In this embodiment, the medicine bin 1 and the pen barrel 2-1-1 are connected via an engagement transmission block 2-1-5, and the two ends of the engagement transmission block 2-1-5 are respectively buckled with the medicine bin 1 and the pen barrel 2-1-1. The buckle connection between the engagement transmission block and the pen barrel is inside the pen barrel, and the buckle connection cannot be disassembled (except for destructive means), which provides a basis for subsequent one-time use.

[0042] In this embodiment, the inner wall of the meshing transmission block 2-1-5 facing the directional transmission sleeve 2-1-7 is provided with a first ratchet wheel tooth 2-1-5-2, and the outer edge of the directional transmission sleeve 2-1-7 is provided with a first elastic pawl 2-1-7-1 matching the first ratchet wheel tooth 2-1-5-2. After the first elastic pawl 2-1-7-1 of the directional transmission sleeve 2-1-7 cooperates with the gear teeth of the meshing transmission block 2-1-5, the directional transmission sleeve 2-1-7 can only rotate in a directional direction. The connection between the scale sleeve 2-1-2 and the transmission member 4 is provided with a second ratchet wheel tooth 2-1-2-3, and a part of the transmission member 4 is provided with a second elastic pawl 4-1 matching the second ratchet wheel tooth 2-1-2-3 of the scale sleeve 2-1-2. The connection between the transmission drum 2-1-4 and the transmission member 4 is provided with a third ratchet wheel tooth 2-1-4-1, and a part of the transmission member 4 is provided with a third elastic pawl 4-2 matching the third ratchet wheel tooth 2-1-4-1 of the transmission drum 2-1-4. The inner top surface of the end of the transmission drum 2-1-4 connected to the transmission member 4 is provided with an end face tooth 2-1-4-2, and the corresponding transmission member 4 is provided with a latch tooth 4-3 meshing with the end face tooth 2-1-4-2 on the transmission drum 2-1-4. This structure enables the transmission member to not transmit torque when the directional transmission sleeve of this embodiment is only capable of performing a left-handed motion in the scale sleeve, and when the scale sleeve performs a right-handed motion, the transmission drum and the directional transmission sleeve perform a linear motion.

[0043] In the present embodiment, in order to prevent the pressing head from generating dynamic friction with the thumb during the pressing process, the pressing head 2-1-3 is designed to include an injection button 2-1-3-1 and a button transmission seat 2-1-3-2. A hollow mounting column 2-1-3-1-1 is provided in the injection button 2-1-3-1. One end of the button transmission seat 2-1-3-2 is inserted into the mounting column 2-1-3-1-1 of the injection button 2-1-3-1. After insertion, the injection button 2-1-3-1 can rotate relative to the button transmission seat 2-1-3-2. A limiting mechanism 5 is provided between the mounting column 2-1-3-1-1 and the button transmission seat 2-1-3-2 to limit the injection button 2-1-3-1 from escaping. The button transmission seat 2-1-3-2 is fixed or rotatably connected to the top of the scale sleeve 2-1-2, and the limiting mechanism 5 includes a radially outwardly protruding annular protrusion 5-1 at the part of the button transmission seat 2-1-3-2 inserted into the mounting column 2-1-3-1-1, a stopper 5-2 with a spacing smaller than the diameter of the annular protrusion 5-1 is provided at the mouth of the mounting column 2-1-3-1-1, and a groove 2-1-3-1-1-1 is axially provided at the mouth of the mounting column 2-1-3-1-1 for the mounting column 2-1-3-1-1 on both sides of the groove 2-1-3-1-1 to be extended. When using, hold the injection pen, press the injection button to start injection, and the force is from the injection button to the button transmission seat to the scale sleeve. The scale sleeve starts to spirally move because it is fixed in the spiral guide rail of the pen barrel, and because the button transmission seat and the injection button are only in contact at the central fulcrum, when the scale sleeve makes a spiral movement, the injection button remains relatively still and the button transmission seat makes a rotational movement. Therefore, this design makes the product more comfortable when using.

[0044] In order to prevent users from using this product multiple times, this embodiment designs this product for one-time use, specifically, the outer surface of the transmission drum 2-1-4 is provided with an external thread 2-1-4-3, and a limit block 6 is threadedly connected to the transmission drum 2-1-4, and a rotation limiting mechanism 7 for limiting the rotation of the limit block 6 is provided between the limit block 6 and the inner wall of the scale sleeve 2-1-2. The rotation limiting mechanism 7 includes a clamping block 7-1 provided on the outer edge of the limit block 6 and a straight groove 7-2 provided on the inner wall of the scale sleeve 2-1-2, and the clamping block 7-1 of the limit block 6 is clamped in the straight groove 7-2 of the scale sleeve 2-1-2, and when the scale sleeve 2-1-2 rotates, the limit block 6 is driven to move upward. Until it reaches the end face of the straight groove on the inner wall of the scale sleeve, the scale sleeve then performs a counterclockwise motion to push the screw out to complete the injection of the medicine. Due to the limitation of the straight groove on the inner wall of the scale sleeve, the pen barrel rotation limit block locks the transmission drum to rotate in the opposite direction, thereby completing the locking of the scale sleeve to eliminate the risk of the syringe being reused.

Claims

1. A disposable adjustable injection pen, comprising a medicine chamber, an injection body connected to the medicine chamber and provided with an injection mechanism therein, and a pen cap sleeved outside the medicine chamber, characterized in that: The injection mechanism comprises: A pen barrel, wherein both ends of the pen barrel are connected and a mounting chamber is built in the pen barrel, and a spiral groove or a spiral protrusion is provided on the inner wall of the pen barrel; The graduated sleeve is provided with a spiral protrusion or a spiral groove on the outside of the graduated sleeve, and matches with the spiral groove or the spiral protrusion in the pen barrel to form a spiral rotation fit. The graduated sleeve is a hollow structure, one end of which is embedded in the pen barrel, and a transmission part is provided at the end; A pressing head, the pressing head is connected to the end of the scale sleeve, and when the scale sleeve is rotating, the end of the pressing head and the hand pressing position are in a stationary state; The transmission drum is arranged in the scale sleeve, and a transmission member that cooperates with the transmission part is arranged between the transmission drum and the scale sleeve, and the transmission drum is a hollow structure; An engaging transmission block, the engaging transmission block is connected and fixed to the pen holder, and the engaging transmission block is provided with a threaded hole penetrating the body; A screw rod, the screw rod is threadedly connected to the threaded hole of the meshing transmission block and one end of the screw rod extends into the medicine bin, a directional transmission sleeve movable in the rotational direction and the axial direction is connected to the screw rod, the screw rod can move axially relative to the directional transmission sleeve, and one end of the directional transmission sleeve is movably clamped in the meshing transmission block or the pen barrel or between the meshing transmission block and the pen barrel; When the pressing head is continuously pressed, the scale sleeve rotates downward and drives the transmission drum to rotate through the transmission member, and then drives the directional transmission sleeve to rotate through the transmission drum to drive the screw to rotate and move downward to squeeze the medicine in the medicine chamber; The inner top surface of one end of the transmission drum connected to the transmission member is provided with end face teeth, and the corresponding transmission member is provided with a clamping tooth that meshes with the end face teeth on the transmission drum.

2. The disposable adjustable injection pen according to claim 1, characterized in that: The medicine bin and the pen holder are connected via an engaging transmission block, and two ends of the engaging transmission block are respectively buckled and connected with the medicine bin and the pen holder.

3. The disposable adjustable injection pen according to claim 1 or 2, characterized in that: The inner wall of the meshing transmission block facing one end of the directional transmission sleeve is provided with a first ratchet gear tooth, and the outer edge of the directional transmission sleeve is provided with a first elastic pawl matching the first ratchet gear tooth. After the first elastic pawl of the directional transmission sleeve cooperates with the gear teeth of the meshing transmission block, the directional transmission sleeve can only rotate in a directional manner.

4. The disposable adjustable injection pen according to claim 1, characterized in that: A second ratchet wheel tooth is provided at the connection between the scale sleeve and the transmission member, and a part of the transmission member is provided with a second elastic pawl matching with the second ratchet wheel tooth of the scale sleeve.

5. The disposable adjustable injection pen according to claim 4, characterized in that: A third ratchet wheel tooth is provided at the connection between the transmission drum and the transmission member, and a part of the transmission member is provided with a third elastic pawl matching with the third ratchet wheel tooth of the transmission drum.

6. The disposable adjustable injection pen according to claim 1, characterized in that: The pressing head includes an injection button and a button transmission seat. A hollow mounting column is provided in the injection button. One end of the button transmission seat is inserted into the mounting column of the injection button. After insertion, the injection button can rotate relative to the button transmission seat. A limiting mechanism is provided between the mounting column and the button transmission seat to limit the injection button from falling out.

7. The disposable adjustable injection pen according to claim 6, characterized in that: The button transmission seat is fixed or rotatably clamped on the top of the scale sleeve, and the limiting mechanism includes a radially outwardly protruding annular bulge on the part of the button transmission seat inserted into the mounting column, a stop bulge with a spacing smaller than the diameter of the annular bulge is provided at the mounting column mouth, and a groove is axially provided at the mounting column mouth to allow the mounting columns on both sides of the groove to extend and retract.

8. The disposable adjustable injection pen according to claim 1, characterized in that: The outer surface of the transmission drum is provided with an external thread, and a limit block is threadedly connected to the transmission drum. A rotation limiting mechanism for limiting the rotation of the limit block is provided between the limit block and the inner wall of the scale sleeve.

9. The disposable adjustable injection pen according to claim 8, characterized in that: The rotation limiting mechanism includes a clamping block arranged on the outer edge of the limit block and a straight groove arranged on the inner wall of the scale sleeve. The clamping block of the limit block is clamped in the straight groove of the scale sleeve. When the scale sleeve rotates, the limit block is driven to move upward.

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