Self-destruction device and single-use injection pen

Abstract

The self-destruction device comprises a shell and a dose adjusting device, the dose adjusting device comprises a dose adjusting rod, and the dose adjusting rod is movably connected to the shell so that the dose adjusting rod can stretch out or retract in the direction of the center axis of the shell relative to the shell. A plurality of shell locking devices are arranged on the inner wall of the shell, and a plurality of screw locking devices matched with the shell locking devices are arranged on the dose adjusting rod. The invention aims to provide a self-destruction device only capable of injecting once and an injection pen only capable of being used once.

Description

Technical Field

[0001] The invention relates to a medical drug injection device, in particular to a self-destruct device and an injection pen that can only be used once. Background Art

[0002] An injection pen, or pen-type syringe, is a device that combines a drug and a syringe into one. It is mainly used by patients who need long-term and periodic injections of drugs, such as patients with chronic diseases. The injection pen is pen-shaped, and the drug to be injected is stored in a cartridge bottle. When the drug needs to be injected, the pen cap is removed, and the injection device is driven after adjusting the injection stroke to the required dose to inject the drug into the human body, thereby completing the drug injection.

[0003] According to whether the cartridge can be replaced, injection pens can be divided into disposable injection pens and reusable injection pens. Disposable injection pens, as the name implies, are cartridges that store drugs and cannot be disassembled or replaced. When the pre-filled drugs in the cartridge are all injected, the disposable injection pen can only be scrapped. The advantages of this type of injection pen are safety and hygiene.

[0004] The use process of the existing disposable injection pen is usually as follows: first adjust the dose adjustment device to the desired dose, usually by pressing a button to push the dose adjustment device to the bottom, the dose adjustment device pushes the small screw built into the injection pen through mechanical transmission, and the injection is completed by the small screw pressing the drug. After the first injection is completed, when the second injection is required, the dose adjustment device is adjusted to the desired dose in the opposite direction to the injection, and the injection process is repeated until the drug in the cartridge is used up. In order to prevent the small screw from retreating between two consecutive injections, causing problems such as the inhalation of impurities such as air in the cartridge and the inaccurate dose of the next injection, the prior art usually sets a ratchet structure between the small screw and the guide sleeve meshing with the small screw (as shown in the Chinese patent application number 201520400422.8) to prevent the small screw from retreating and ensure that the injection pen completes the injection in a safe and accurate environment as much as possible.

[0005] However, existing disposable injection pens have the following problems: the injection cycle of some chronic diseases is longer than the storage cycle of the drug after opening. For example, for growth hormone, the interval between two consecutive growth hormone injections of the patient is longer than the storage cycle of the growth hormone after opening. In the interval between these two growth hormone injections, the growth hormone after opening will be partially or even completely ineffective. Reusing the opened growth hormone will not only affect the patient's treatment effect, but also may expose the patient to uncontrollable health risks. At the same time, depending on the patient's condition, the amount of each injection may be less than the amount stored in the cartridge. In order to prevent some patients from continuing to use the opened drug, the best way is to use the disposable injection pen only for one injection. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to provide a self-destruct device that can only be injected once and an injection pen that can only be used once.

[0007] Technical solution: The self-destruct device described in the present invention includes a shell and a dose adjustment device, the dose adjustment device includes a dose adjustment rod, the dose adjustment rod is movably connected to the shell, so that the dose adjustment rod can extend or retract relative to the shell along the central axis of the shell, and the inner wall of the shell is provided with a plurality of shell locking devices, the shell locking devices are used to prevent the dose adjustment rod from moving along the central axis of the shell in a direction away from the medicine chamber (i.e., extending movement), and the dose adjustment rod is provided with a plurality of screw locking devices matching the shell locking devices.

[0008] Furthermore, a moving groove is provided on the outer wall of the dose adjustment rod, and a moving guide block matching the moving groove is provided on the inner wall of the shell, and the moving guide block is slidably connected to the moving groove.

[0009] Furthermore, the movable groove may be in a straight line or in a spiral line.

[0010] Furthermore, the shell locking device is a locking ratchet, and a ratchet feed surface and a ratchet locking surface are respectively arranged on both sides of the locking ratchet, and the angle between the ratchet feed surface and the inner wall of the shell is smaller than the angle between the ratchet locking surface and the inner wall of the shell; the screw locking device is a locking protrusion, and a protrusion feeding surface and a protrusion locking surface are respectively arranged on both sides of the locking protrusion, and the angle between the protrusion feeding surface and the outer wall of the dose adjustment rod is smaller than the angle between the protrusion locking surface and the outer wall of the dose adjustment rod. The ratchet feeding surface refers to the surface of the locking ratchet that first contacts the locking protrusion. When the dose adjustment rod rotates and feeds toward the medicine chamber along the moving groove, the locking ratchet will contact the locking protrusion. The surface of the locking ratchet that first contacts the locking protrusion is hereby defined as the ratchet feeding surface. The ratchet locking surface refers to the surface of the locking ratchet that abuts against the locking protrusion. When the dose adjustment rod rotates and feeds toward the medicine chamber along the moving groove to the bottom, the locking protrusion passes over the locking ratchet. After the locking protrusion passes over, if the dose adjustment rod is reversed, the locking ratchet will abut against the locking protrusion. The surface of the locking ratchet that abuts against the locking protrusion is hereby defined as the ratchet locking surface. The raised feed surface refers to the surface of the locking protrusion that first contacts the locking ratchet. When the dose adjustment rod rotates and feeds along the moving groove toward the medicine chamber, the locking protrusion will contact the locking ratchet. The surface of the locking protrusion that first contacts the locking ratchet is hereby defined as the locking feed surface. The raised locking surface refers to the surface of the locking protrusion that abuts against the locking ratchet. When the dose adjustment rod rotates and feeds to the bottom along the moving groove toward the medicine chamber, the locking protrusion will pass over the locking ratchet. After the locking protrusion passes over, if the dose adjustment rod is reversed, the locking protrusion will abut against the locking ratchet. The surface of the locking protrusion that abuts against the locking ratchet is hereby defined as the raised locking surface. When the locking protrusion passes over the locking ratchet, the ratchet locking surface abuts against the raised locking surface. Therefore, the locking protrusion prevents the dose adjustment rod from moving along the central axis of the housing in the direction away from the medicine chamber (i.e., extending movement), so that the injection pen loses the ability to adjust the dose again, and the injection pen cannot be used again, so the injection pen self-destructs. The locking ratchet is generally a rigid part, and the rigid locking ratchet prevents the dose adjustment rod from extending along the central axis of the shell by rigidly abutting against the locking protrusion; however, the locking ratchet can also be configured to be elastic or have a certain flexibility. When the locking protrusion passes over the locking ratchet and the dose adjustment rod wants to extend, the locking ratchet actually gets stuck in the space between the locking protrusion and the dose adjustment rod, thereby preventing the dose adjustment rod from extending along the central axis of the shell.

[0011] Furthermore, the angle between the ratchet feeding surface and the inner wall of the housing and the angle between the protrusion feeding surface and the outer wall of the dose adjustment rod match. This design makes it easier for the locking protrusion to pass over the locking ratchet.

[0012] Furthermore, the shell includes an adjustment rod guide sleeve, which is detachably connected to the inner wall of the shell, the relative position between the adjustment rod guide sleeve and the shell is fixed, and the inner wall of the adjustment rod guide sleeve is provided with a movable guide block matching the movable groove.

[0013] Furthermore, the locking protrusion is arranged at the middle and lower part of the dose adjustment rod (the "lower" here refers to the end closer to the injection end or the syringe), preferably at the end close to the injection end (it can also be said to be close to the medicine chamber). This design is to better prevent the injection pen from self-destructing due to misoperation.

[0014] An injection pen that can only be used once comprises a shell, one end of which is provided with a medicine chamber for storing medicine, an inner cavity of the shell is provided with a dose adjustment device, the dose adjustment device comprises a dose adjustment rod, the dose adjustment rod is movably connected to the shell, so that the dose adjustment rod can extend or retract relative to the shell along the central axis of the shell, a plurality of shell locking devices are provided on the inner wall of the shell, the shell locking devices are used to prevent the dose adjustment rod from moving along the central axis of the shell in a direction away from the medicine chamber (i.e., extending movement), and a plurality of screw locking devices matching the shell locking devices are provided on the dose adjustment rod.

[0015] Furthermore, a moving groove is provided on the outer wall of the dose adjustment rod, and a moving guide block matching the moving groove is provided on the inner wall of the shell, and the moving guide block is slidably connected to the moving groove.

[0016] Furthermore, the movable groove may be in a straight line or in a spiral line.

[0017] Furthermore, the shell locking device is a locking ratchet, and a ratchet feed surface and a ratchet locking surface are respectively arranged on both sides of the locking ratchet, and the angle between the ratchet feed surface and the inner wall of the shell is smaller than the angle between the ratchet locking surface and the inner wall of the shell; the screw locking device is a locking protrusion, and a protrusion feeding surface and a protrusion locking surface are respectively arranged on both sides of the locking protrusion, and the angle between the protrusion feeding surface and the outer wall of the dose adjustment rod is smaller than the angle between the protrusion locking surface and the outer wall of the dose adjustment rod. The ratchet feeding surface refers to the surface of the locking ratchet that first contacts the locking protrusion. When the dose adjustment rod rotates and feeds toward the medicine chamber along the moving groove, the locking ratchet will contact the locking protrusion. The surface of the locking ratchet that first contacts the locking protrusion is hereby defined as the ratchet feeding surface. The ratchet locking surface refers to the surface of the locking ratchet that abuts against the locking protrusion. When the dose adjustment rod rotates and feeds toward the medicine chamber along the moving groove to the bottom, the locking protrusion passes over the locking ratchet. After the locking protrusion passes over, if the dose adjustment rod is reversed, the locking ratchet will abut against the locking protrusion. The surface of the locking ratchet that abuts against the locking protrusion is hereby defined as the ratchet locking surface. The raised feed surface refers to the surface of the locking protrusion that first contacts the locking ratchet. When the dose adjustment rod rotates and feeds along the moving groove toward the medicine chamber, the locking protrusion will contact the locking ratchet. The surface of the locking protrusion that first contacts the locking ratchet is hereby defined as the locking feed surface. The raised locking surface refers to the surface of the locking protrusion that abuts against the locking ratchet. When the dose adjustment rod rotates and feeds to the bottom along the moving groove toward the medicine chamber, the locking protrusion will pass over the locking ratchet. After the locking protrusion passes over, if the dose adjustment rod is reversed, the locking protrusion will abut against the locking ratchet. The surface of the locking protrusion that abuts against the locking ratchet is hereby defined as the raised locking surface. When the locking protrusion passes over the locking ratchet, the ratchet locking surface abuts against the raised locking surface. Therefore, the locking protrusion prevents the dose adjustment rod from moving along the central axis of the housing in the direction away from the medicine chamber (i.e., extending movement), so that the injection pen loses the ability to adjust the dose again, and the injection pen cannot be used again, so the injection pen self-destructs.

[0018] Furthermore, the angle between the ratchet feeding surface and the inner wall of the housing and the angle between the protrusion feeding surface and the outer wall of the dose adjustment rod match. This design makes it easier for the locking protrusion to pass over the locking ratchet.

[0019] Furthermore, the shell includes an adjustment rod guide sleeve, which is detachably connected to the inner wall of the shell, the relative position between the adjustment rod guide sleeve and the shell is fixed, and the inner wall of the adjustment rod guide sleeve is provided with a movable guide block matching the movable groove.

[0020] Furthermore, the locking protrusion is arranged at the middle and lower part of the dose adjustment rod (the "lower" here refers to the end closer to the injection end or the syringe), preferably at the end close to the injection end (it can also be said to be close to the medicine chamber). This design is to better prevent the injection pen from self-destructing due to misoperation.

[0021] Furthermore, a safety piece is provided at one end of the housing away from the medicine bin, and the safety piece is used to abut against the dose adjustment rod, so that the dose adjustment rod cannot be fed to the bottom along the central axis direction of the housing, so that the dose adjustment rod will not be locked by the locking protrusion, thereby preventing misoperation.

[0022] The injection pen state when injection is allowed is defined as the injection state, and the injection pen state when injection is not allowed is defined as the non-injection state. The safety piece is to prevent the operator from accidentally pressing the injection pen to the bottom when the injection pen is in the non-injection state, causing the dose adjustment rod to be locked by the locking protrusion, making the injection pen scrapped.

[0023] Furthermore, the safety piece is annular, and a deformation groove is provided on the safety piece, and the deformation groove is used to facilitate the deformation of the safety piece, so as to realize more convenient removal of the safety piece.

[0024] Furthermore, a plurality of safety protrusions are arranged on the shell, and a plurality of first safety holes for inserting the safety protrusions are opened on the safety member.

[0025] Furthermore, an anti-misoperation boss is provided on the dose adjustment rod, and the anti-misoperation boss is used to abut against the safety member to prevent misoperation.

[0026] Furthermore, the safety piece is annular, and the safety piece can be rotatably arranged in the housing. The dose adjustment rod is provided with an anti-mistaken protrusion, and the inner wall of the safety piece is provided with a plurality of travel grooves for inserting the anti-mistaken protrusion. The depth of the travel groove corresponding to the safety piece in the injection state is greater than the depth of the travel groove corresponding to the safety piece in the non-injection state. Of course, the depth of the travel groove corresponding to the injection pen in the non-injection state can also be 0. After the safety piece is rotated, the travel grooves of different depths are used to allow the anti-mistaken protrusion to move to different lengths, which is essentially used to limit the travel of the locking protrusion to prevent or allow the locking protrusion to cross the locking ratchet and cause the injection pen to self-destruct.

[0027] Furthermore, a shifting protrusion is provided on the periphery of the safety element, a shifting through slot is provided on the shell, and the shifting protrusion is slidably connected to the shifting through slot.

[0028] Furthermore, a button is provided at one end of the dosage adjustment rod away from the medicine chamber.

[0029] Furthermore, one end of the medicine bin is provided with a needle thread for connecting to a needle.

[0030] Furthermore, it also includes a pen cap, which is detachably connected to the medicine chamber.

[0031] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The present invention is provided with a plurality of shell locking devices on the inner wall of the shell, and a plurality of screw locking devices matching the shell locking devices are provided on the dose adjustment rod. When the injection pen is in the injection state and starts to inject, the button at the end of the dose adjustment rod is pressed, and the button pushes the dose adjustment rod to move toward the medicine chamber in a spiral manner along the central axis direction of the shell until the bottom. During the movement, the locking protrusion passes over the locking ratchet. After the injection is completed, the locking ratchet abuts and locks the locking protrusion. The dose adjustment rod can no longer rotate in the opposite direction, and no mechanism can push the small screw again to achieve a second injection, thereby realizing the self-destruction of the injection pen; 2. When the locking protrusion passes over the locking ratchet, the operator needs to increase the pressing force, thereby playing a role of reminding the operator and indirectly assisting the operator to confirm the injection action for the second time; 3. A safety piece is provided at the end of the shell away from the medicine chamber, which can prevent the operator from operating incorrectly and prevent waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional diagram of the first embodiment of the present invention.

[0033] Figure 2 This is a cross-sectional view of the first embodiment of the present invention with the pen cap and medicine chamber hidden.

[0034] Figure 3 It is an exploded view of the first embodiment of the present invention.

[0035] Figure 4 It is a three-dimensional view of the adjusting rod guide sleeve in the first embodiment of the present invention.

[0036] Figure 5 It is a cross-sectional view of the adjusting rod guide sleeve in the first embodiment of the present invention.

[0037] Figure 6 It is a three-dimensional diagram of the first shell in the first embodiment of the present invention.

[0038] Figure 7 It is a cross-sectional view at one angle of the first shell in the first embodiment of the present invention.

[0039] Figure 8 for Figure 7 Enlarged view at A.

[0040] Fig. 9 It is a cross-sectional view at another angle of the first shell in the first embodiment of the present invention.

[0041] Fig.10 FIG. 4 is a three-dimensional diagram of a dose adjustment rod in the first embodiment of the present invention.

[0042] Fig.11 for Fig.10 Enlarged view at B.

[0043] Fig.12 FIG. 1 is a bottom view of the dose adjustment rod in the first embodiment of the present invention.

[0044] Fig.13 for Fig.12 Enlarged view at C.

[0045] Fig.14 It is a three-dimensional diagram of the first safety ring in the first embodiment of the present invention.

[0046] Fig.15 It is a cross-sectional view of the first safety ring in the first embodiment of the present invention.

[0047] Fig.16 It is an exploded view of the second embodiment of the present invention.

[0048] Fig.17 FIG. 4 is a three-dimensional diagram of a second shell in a second embodiment of the present invention.

[0049] Fig.18 It is a cross-sectional view at an angle of the second shell in the second embodiment of the present invention.

[0050] Fig.19 for Fig.18 Enlarged view at D.

[0051] Fig. 20 It is a cross-sectional view at another angle of the second shell in the second embodiment of the present invention.

[0052] Fig.21 FIG. 4 is a three-dimensional diagram of a second safety ring in a second embodiment of the present invention.

[0053] Fig. 22 4 is a cross-sectional view of a second safety ring in a second embodiment of the present invention.

[0054] Among them: 1. button; 2. pressing spring; 3. spring fixing seat; 4. spiral sleeve; 5. adjusting rod limiting sleeve; 6. dose adjusting rod; 601. anti-mistake boss; 602. moving groove; 603. locking protrusion; 6031. protruding feeding surface; 6032. protruding locking surface; 604. adjusting rod protrusion; 71. first safety ring; 7101. first safety hole; 7102. first deformation groove; 7103. first limiting step; 72. second safety ring; 7201. travel groove; 7202. shifting protrusion; 8. adjusting rod guide sleeve; 801. moving guide block; 802 , adjusting rod guide sleeve window; 91, first shell; 9101, safety protrusion; 9102, first window; 9103, first locking ratchet; 91031, first ratchet feed surface; 91032, first ratchet locking surface; 92, second shell; 9201, second shifting slot; 9202, second window; 9203, second locking ratchet; 92031, second ratchet feed surface; 92032, second ratchet locking surface; 10, small screw; 11, ratchet fixing sleeve; 12, ratchet sleeve; 13, small screw guide sleeve; 14, push block; 15, medicine chamber; 16, pen cap. DETAILED DESCRIPTION

[0055] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0056] Example 1

[0057] See attached Figure 1 to Figure 15 The single-use injection pen shown in the present invention includes a button 1, a pressing spring 2, a spring fixing seat 3, a spiral sleeve 4, an adjustment rod limiting sleeve 5, a dosage adjustment rod 6, a first safety ring 71, an adjustment rod guide sleeve 8, a first shell 91, a small screw 10, a ratchet fixing sleeve 11, a ratchet sleeve 12, a small screw guide sleeve 13, a push block 14, a medicine chamber 15 and a pen cap 16.

[0058] A medicine chamber 15 for storing medicine is disposed at one end of the first housing 91, and a needle thread for connecting with a needle is disposed at one end of the medicine chamber 15; a pen cap 16 is detachably connected to the medicine chamber 15. A button 1 is disposed at one end of the dose adjustment rod 6 away from the medicine chamber 15.

[0059] The first housing 91 includes an adjusting rod guide sleeve 8, which is detachably connected to the inner wall of the first housing 91. The relative position between the adjusting rod guide sleeve 8 and the first housing 91 is fixed. The inner wall of the adjusting rod guide sleeve 8 is provided with a moving guide block 801 matching the moving groove 602, and the moving guide block 801 is in a spiral shape. An adjusting rod guide sleeve window 802 is provided on the adjusting rod guide sleeve 8, and a first window 9102 is provided on the first housing 91. The relative positions of the adjusting rod guide sleeve window 802 and the first window 9102 correspond to each other. The adjusting rod guide sleeve window 802 and the first window 9102 are used to help the operator observe the numbers displayed on the adjusting rod guide sleeve 8 to determine the injection dose.

[0060] The inner cavity of the first shell 91 is provided with a dose adjustment device, which includes a dose adjustment rod 6. The outer wall of the dose adjustment rod 6 is provided with a spiral moving groove 602. The moving guide block 801 is slidably connected with the moving groove 602. When the dose adjustment rod 6 can extend or retract relative to the first shell 91 along the central axis direction of the first shell 91, two first locking ratchets 9103 are provided on the inner wall of the first shell 91, and two locking protrusions 603 matching the first locking ratchets 9103 are provided on one end of the dose adjustment rod 6 close to the medicine chamber 15.

[0061] A first ratchet feeding surface 91031 and a first ratchet locking surface 91032 are respectively arranged on both sides of the first locking ratchet 9103, and the angle between the first ratchet feeding surface 91031 and the inner wall of the housing is smaller than the angle between the first ratchet locking surface 91032 and the inner wall of the housing; the screw locking device is a locking protrusion 603, and a protrusion feeding surface 6031 and a protrusion locking surface 6032 are respectively arranged on both sides of the locking protrusion 603, and the angle between the protrusion feeding surface 6031 and the outer wall of the dose adjustment rod 6 is smaller than the angle between the protrusion locking surface 6032 and the outer wall of the dose adjustment rod 6. The angle between the first ratchet feeding surface 91031 and the inner wall of the housing, and the angle between the protrusion feeding surface 6031 and the outer wall of the dose adjustment rod 6 match.

[0062] The first ratchet feeding surface 91031 refers to the surface on the first locking ratchet 9103 that first contacts the locking protrusion 603 when the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15, and the first ratchet locking surface 91032 refers to the surface that abuts against the locking protrusion 603 after the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15 and the locking protrusion 603 passes over the first locking ratchet 9103; the protrusion feeding surface 6031 refers to the surface that first contacts with the first locking ratchet 9103 when the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15, and the protrusion locking surface 6032 refers to the surface that abuts against the first locking ratchet 9103 after the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15 and the locking protrusion 603 passes over the first locking ratchet 9103. When the locking protrusion 603 passes over the first locking ratchet 9103, the first ratchet locking surface 91032 abuts against the protrusion locking surface 6032, so that the locking protrusion 603 prevents the dose adjustment rod 6 from moving along the central axis direction of the first shell 91 in the direction away from the medicine chamber 15 (i.e., extending movement), causing the injection pen to lose the ability to adjust the dose again, and the injection pen cannot be used again, so the injection pen self-destructs.

[0063] A first safety ring 71 is arranged at one end of the first shell 91 away from the medicine chamber 15. The first safety ring 71 is ring-shaped and has a first deformation groove 7102. Two safety protrusions 9101 are arranged on the first shell 91 and two first safety holes 7101 for inserting the safety protrusions 9101 are arranged on the safety ring.

[0064] The dose adjustment rod 6 is provided with an anti-misoperation boss 601 , which is used to abut against the first safety ring 71 to prevent misoperation.

[0065] The dose adjustment rod 6 is also provided with an adjustment rod protrusion 604 , and a first limiting step 7103 is provided in the first safety ring 71 . The first limiting step 7103 is used to cooperate with the adjustment rod protrusion 604 to limit the dose adjustment rod 6 to prevent the dose adjustment rod 6 from excessive rotation.

[0066] When using the present invention, the first safety ring 71 is not removed. The dose adjustment rod 6 is rotated upward for a certain stroke, and then the button 1 is pressed downward. The button 1 pushes the dose adjustment rod 6 to move toward the medicine chamber 15 in a spiral manner along the central axis of the shell. Due to the limitation of the first safety ring 71, the dose adjustment rod 6 cannot reach the bottom. This step is used to exhaust the air of the medicine in the medicine chamber 15; after the air is exhausted, the dose adjustment rod 6 is rotated upward again to the dose position to be injected, the first safety ring 71 is removed, and the button 1 is pressed downward. The button 1 pushes the dose adjustment rod 6 to move toward the medicine chamber 15 in a spiral manner along the central axis of the shell until the bottom. During the movement, the locking protrusion 603 passes over the first locking ratchet 9103. After the injection is completed, the first locking ratchet 9103 abuts and locks the locking protrusion 603, and the dose adjustment rod 6 can no longer rotate in the opposite direction. There is no mechanism that can push the small screw 10 again to achieve secondary injection, thereby achieving self-destruction of the injection pen.

[0067] Example 2

[0068] See attached Figure 16 to Figure 22 And refer to Figure 2 , Figure 4 , Figure 5 , Figure 10-13 The single-use injection pen shown in the present invention includes a button 1, a pressing spring 2, a spring fixing seat 3, a spiral sleeve 4, an adjustment rod limiting sleeve 5, a dosage adjustment rod 6, a second safety ring 72, an adjustment rod guide sleeve 8, a second shell 92, a small screw 10, a ratchet fixing sleeve 11, a ratchet sleeve 12, a small screw guide sleeve 13, a push block 14, a medicine chamber 15 and a pen cap 16.

[0069] A medicine chamber 15 for storing medicine is disposed at one end of the second housing 92, and a needle thread for connecting with a needle is disposed at one end of the medicine chamber 15; a pen cap 16 is detachably connected to the medicine chamber 15. A button 1 is disposed at one end of the dose adjustment rod 6 away from the medicine chamber 15.

[0070] The second housing 92 includes an adjustment rod guide sleeve 8, which is detachably connected to the inner wall of the second housing 92. The relative position between the adjustment rod guide sleeve 8 and the second housing 92 is fixed. The inner wall of the adjustment rod guide sleeve 8 is provided with a moving guide block 801 matching the moving groove 602, and the moving guide block 801 is in a spiral shape. An adjustment rod guide sleeve window 802 is provided on the adjustment rod guide sleeve 8, and a second window 9202 is provided on the second housing 92. The relative positions of the adjustment rod guide sleeve window 802 and the second window 9202 correspond to each other. The adjustment rod guide sleeve window 802 and the second window 9202 are used to help the operator observe the numbers displayed on the adjustment rod guide sleeve 8 to determine the injection dose.

[0071] The inner cavity of the second shell 92 is provided with a dose adjustment device, which includes a dose adjustment rod 6. The outer wall of the dose adjustment rod 6 is provided with a spiral moving groove 602, and the moving guide block 801 is slidably connected with the moving groove 602. When the dose adjustment rod 6 can extend or retract relative to the second shell 92 along the central axis direction of the second shell 92, two second locking ratchets 9203 are provided on the inner wall of the second shell 92, and two locking protrusions 603 matching the second locking ratchets 9203 are provided on one end of the dose adjustment rod 6 close to the medicine chamber 15.

[0072] A second ratchet feeding surface 92031 and a second ratchet locking surface 92032 are respectively arranged on both sides of the second locking ratchet 9203, and the angle between the second ratchet feeding surface 92031 and the inner wall of the housing is smaller than the angle between the second ratchet locking surface 92032 and the inner wall of the housing; the screw locking device is a locking protrusion 603, and a protrusion feeding surface 6031 and a protrusion locking surface 6032 are respectively arranged on both sides of the locking protrusion 603, and the angle between the protrusion feeding surface 6031 and the outer wall of the dose adjustment rod 6 is smaller than the angle between the protrusion locking surface 6032 and the outer wall of the dose adjustment rod 6. The angle between the second ratchet feeding surface 92031 and the inner wall of the housing, and the angle between the protrusion feeding surface 6031 and the outer wall of the dose adjustment rod 6 match.

[0073] The second ratchet feeding surface 92031 refers to the surface on the second locking ratchet 9203 that first contacts the locking protrusion 603 when the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15, and the second ratchet locking surface 92032 refers to the surface that abuts against the locking protrusion 603 after the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15 and the locking protrusion 603 passes over the second locking ratchet 9203; the protrusion feeding surface 6031 refers to the surface that first contacts the second locking ratchet 9203 when the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15, and the protrusion locking surface 6032 refers to the surface that abuts against the second locking ratchet 9203 after the dose adjustment rod 6 rotates and feeds along the moving groove 602 toward the medicine chamber 15 and the locking protrusion 603 passes over the second locking ratchet 9203. When the locking protrusion 603 passes over the second locking ratchet 9203, the second ratchet locking surface 92032 abuts against the protruding locking surface 6032, so that the locking protrusion 603 prevents the dose adjustment rod 6 from moving along the central axis direction of the second shell 92 in the direction away from the medicine chamber 15 (i.e., extending movement), causing the injection pen to lose the ability to adjust the dose again, and the injection pen cannot be used again, so the injection pen self-destructs.

[0074] It is defined that the state of the injection pen when injection is allowed is the injection state, and the state of the injection pen when injection is not allowed is the non-injection state.

[0075] A second safety ring 72 is arranged at one end of the second shell 92 away from the medicine chamber 15. The second safety ring 72 is ring-shaped and can be rotatably arranged in the second shell 92. An anti-mistake protrusion is arranged on the dose adjustment rod 6. A travel groove 7201 for inserting the anti-mistake protrusion is arranged on the inner wall of the safety ring. The bottom of the travel groove 7201 is inclined (the bottom of the travel groove 7201 is sloped), and the depth of the travel groove 7201 corresponding to the safety ring in the injection state is greater than the depth of the travel groove 7201 corresponding to the safety ring in the non-injection state; a shifting protrusion 7202 is arranged on the outer periphery of the safety ring, and a second shifting through groove 9201 is arranged on the second shell 92, and the shifting protrusion 7202 is slidably connected with the second shifting through groove 9201.

[0076] When using the present invention, first, the second safety ring 72 is not rotated, the second safety ring 72 is in the first position, the depth of the travel groove 7201 corresponding to the anti-error protrusion in the first position is 0, the dose adjustment rod 6 is first rotated upward for a certain stroke, and then the button 1 is pressed downward, and the button 1 pushes the dose adjustment rod 6 to move toward the medicine chamber 15 in a spiral manner along the central axis direction of the shell. Due to the limitation of the cooperation between the second safety ring 72 and the anti-error protrusion, the dose adjustment rod 6 cannot reach the bottom. This step is used to exhaust the air of the medicine in the medicine chamber 15; after the air is exhausted, the dose adjustment rod 6 is rotated upward again to the dose position to be injected, and the dial protrusion 7202 is turned, so that The second safety ring 72 is rotated to the second position. The depth of the travel groove 7201 corresponding to the anti-error protrusion at the second position is to allow the locking protrusion 603 to pass over the second locking ratchet 9203. The button 1 is pressed downward. The button 1 pushes the dose adjustment rod 6 to move in a spiral manner along the central axis of the shell toward the medicine chamber 15 until the bottom. During the movement, the locking protrusion 603 passes over the second locking ratchet 9203. After the injection is completed, the second locking ratchet 9203 abuts and locks the locking protrusion 603. The dose adjustment rod 6 can no longer rotate in the opposite direction. There is no mechanism that can push the small screw 10 again to achieve a second injection, thereby achieving self-destruction of the injection pen.

Claims

1. A self-destruct device, characterized in that: The invention comprises a shell and a dose adjustment device, wherein the dose adjustment device comprises a dose adjustment rod, wherein the dose adjustment rod is movably connected to the shell so that the dose adjustment rod can extend or retract relative to the shell along the central axis of the shell, wherein the inner wall of the shell is provided with a plurality of locking ratchets, and the dose adjustment rod is provided with a plurality of locking protrusions matching the locking ratchets, wherein the locking protrusions are provided at the middle and lower part of the dose adjustment rod.

2. A self-destruct device according to claim 1, characterized in that: The outer wall of the dose adjustment rod is provided with a moving groove, the inner wall of the shell is provided with a moving guide block matching the moving groove, and the moving guide block is slidably connected with the moving groove.

3. A self-destruct device according to claim 2, characterized in that: The moving groove is in a spiral shape.

4. A self-destruct device according to claim 1, characterized in that: A ratchet feeding surface and a ratchet locking surface are respectively arranged on both sides of the locking ratchet, and the angle between the ratchet feeding surface and the inner wall of the shell is smaller than the angle between the ratchet locking surface and the inner wall of the shell; a protrusion feeding surface and a protrusion locking surface are respectively arranged on both sides of the locking protrusion, and the angle between the protrusion feeding surface and the outer wall of the dose adjustment rod is smaller than the angle between the protrusion locking surface and the outer wall of the dose adjustment rod.

5. A self-destruct device according to claim 4, characterized in that: The angle between the ratchet feeding surface and the inner wall of the housing and the angle between the protruding feeding surface and the outer wall of the dose adjustment rod match.

6. A self-destruct device according to claim 2, characterized in that: The shell comprises an adjusting rod guide sleeve, which is detachably connected to the inner wall of the shell, and the relative positions of the adjusting rod guide sleeve and the shell are fixed. The inner wall of the adjusting rod guide sleeve is provided with a moving guide block matching the moving groove.

7. An injection pen that can only be used once, characterized in that: The invention comprises a shell, one end of which is provided with a medicine chamber for storing medicine, an inner cavity of the shell is provided with a dose adjustment device, the dose adjustment device comprises a dose adjustment rod, an outer wall of the dose adjustment rod is provided with a spiral moving groove, an inner wall of the shell is provided with a moving guide block matching the moving groove, the moving guide block is slidably connected with the moving groove, so that the dose adjustment rod is extended or retracted relative to the shell along the central axis direction of the shell, a plurality of locking ratchets are provided on the inner wall of the shell, a plurality of locking protrusions matching the locking ratchets are provided on the dose adjustment rod, and the locking protrusions are provided at the middle and lower part of the dose adjustment rod close to the injection end.

8. The single-use injection pen according to claim 7, characterized in that: A ratchet feeding surface and a ratchet locking surface are respectively arranged on both sides of the locking ratchet, and the angle between the ratchet feeding surface and the inner wall of the shell is smaller than the angle between the ratchet locking surface and the inner wall of the shell; a protrusion feeding surface and a protrusion locking surface are respectively arranged on both sides of the locking protrusion, and the angle between the protrusion feeding surface and the outer wall of the dose adjustment rod is smaller than the angle between the protrusion locking surface and the outer wall of the dose adjustment rod.

9. The single-use injection pen according to claim 8, characterized in that: The angle between the ratchet feeding surface and the inner wall of the housing and the angle between the protruding feeding surface and the outer wall of the dose adjustment rod match.

10. The single-use injection pen according to claim 7, characterized in that: The shell comprises an adjusting rod guide sleeve, which is detachably connected to the inner wall of the shell, and the relative positions of the adjusting rod guide sleeve and the shell are fixed. The inner wall of the adjusting rod guide sleeve is provided with a moving guide block matching the moving groove.

11. The single-use injection pen according to claim 7, characterized in that: A safety piece is arranged at one end of the shell away from the medicine bin.

12. The single-use injection pen according to claim 11, characterized in that: The safety piece is annular and has a deformation groove.

13. The single-use injection pen according to claim 12, characterized in that: The shell body is provided with a plurality of safety protrusions, and the safety member is provided with a plurality of first safety holes for inserting the safety protrusions.

14. The single-use injection pen according to any one of claims 11 to 13, characterized in that: The dose adjustment rod is provided with an anti-misoperation boss, and the anti-misoperation boss is used to abut against the safety member to prevent misoperation.

15. The single-use injection pen according to claim 11, characterized in that: The safety piece is annular and rotatably arranged in the shell. The dose adjustment rod is provided with an anti-mistake protrusion. The inner wall of the safety piece is provided with a plurality of travel grooves for inserting the anti-mistake protrusion. The depth of the travel groove corresponding to the safety piece in the injection state is greater than the depth of the travel groove corresponding to the safety piece in the non-injection state.

16. The single-use injection pen according to claim 15, characterized in that: A shifting protrusion is arranged on the outer periphery of the safety element, a shifting through slot is arranged on the shell, and the shifting protrusion is slidably connected with the shifting through slot.

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