A fixed-dose automatic injection pen

Abstract

The present invention discloses a fixed-dose automatic injection pen, comprising: a pen barrel, a pen body is arranged inside the pen barrel, a pen cover is arranged at one end of the pen body, a pen barrel cap is arranged at one end of the pen barrel, a back cover is arranged at the other end of the pen body, and a protective plug is arranged on the back cover; a PFS sleeve container is arranged inside the pen body, the PFS sleeve container is snap-connected to the pen body, a PFS sleeve is slidably arranged in the PFS sleeve container, a PFS is arranged in the PFS sleeve, a soft protective cap is arranged on the PFS, a secondary power group is arranged between the PFS sleeve and the back cover, a trigger protection mechanism is arranged on the pen body, and the trigger mechanism is located between the pen cover and the PFS sleeve container; after the injection is completed, the trigger protection mechanism will rebound and lock, thereby covering the ejected needle, preventing the needle from being exposed to the outside world and easily causing harm to the user.

Description

Technical Field

[0001] The present invention relates to the technical field of injection pens, and more particularly to a fixed-dose automatic injection pen. Background Art

[0002] An allergic reaction is an emergency condition that can occur rapidly (as soon as within minutes of contact with an allergen) or even be life-threatening in everyday life. It can be caused by a variety of allergens or triggers, commonly including certain foods, insect bites, medications and latex. The symptoms of an allergic reaction vary, but symptoms involving the skin (hives, itching, redness of the skin) are the most common. Most cases also involve swelling of the lips and tongue and the respiratory tract (tightness of the throat, shortness of breath). Allergic reactions may also involve the gastrointestinal system (nausea, stomach pain, vomiting, diarrhea), the cardiovascular system (rapid heartbeat, chest pain, low blood pressure) or the central nervous system (headache, confusion).

[0003] Epinephrine, when used in an allergy emergency, causes blood vessels to constrict to increase blood pressure, relaxes the smooth muscles of the lungs to reduce wheezing and improve breathing, stimulates the heart (increases heart rate), and reduces hives and swelling that may occur around the face and lips. According to national food allergy guidelines, epinephrine is the only recommended first-line treatment for anaphylaxis. An anaphylactic attack is an emergency, and when it comes to potentially life-threatening allergic reactions (anaphylaxis), an emergency plan needs to be in place ahead of time. The plan includes avoiding known allergens, recognizing the signs and symptoms of anaphylaxis, carrying an emergency autoinjector pen at all times, and seeking emergency medical assistance immediately.

[0004] Currently, epinephrine injections in ampoules are common in clinical practice and very affordable, but they are cumbersome to use, which is disadvantageous for emergency medical treatment. Prefilled epinephrine pens, on the other hand, contain a fixed amount of epinephrine in an automatic syringe. They are quick to use and can even be used by patients for self-injection in emergency situations. However, the needle of existing prefilled pens remains exposed after injection, potentially causing harm to the user. Therefore, there is a need for a fixed-dose automatic injection pen to at least partially address the challenges of the existing technology. Summary of the Invention

[0005] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a fixed-dose automatic injection pen, comprising:

[0007] A pen holder, wherein a pen body is provided inside the pen holder, a pen cover is provided at one end of the pen body, a pen holder cap is provided at one end of the pen holder, a back cover is provided at the other end of the pen body, and a protective bolt is provided on the back cover;

[0008] A PFS sleeve container is provided in the pen body, which is snapped onto the pen body. A PFS sleeve is slidably provided in the PFS sleeve container, a PFS is provided in the PFS sleeve, a soft protective cap is provided on the PFS, a secondary power group is provided between the PFS sleeve and the back cover, a trigger protection mechanism is provided on the pen body, and the trigger protection mechanism is located between the pen cap and the PFS sleeve container.

[0009] Preferably, the pen barrel cap is provided with a gear, the pen body is provided with a rack, and the gear and the rack are meshed;

[0010] A hook is provided at one end of the pen barrel away from the pen barrel cap, the hook is engaged with a slot in the pen cap, a plurality of pen cap hooks are evenly arranged in the pen cap, and the pen cap hooks are clamped on the soft protective cap.

[0011] Preferably, a plug post is provided on the inner wall of the back cover, and two arc-shaped pieces are symmetrically provided on the inner wall of the back cover, with the two adjacent arc-shaped pieces located between the plug posts, a protrusion is provided on the side of the arc-shaped piece close to the plug post, and two limit pieces are provided on the side of the arc-shaped piece away from the plug post.

[0012] Preferably, the secondary power group includes:

[0013] The power group body is slidably connected to the inner wall of the pen body. A groove is provided at the end of the power group body away from the rear cover. A sliding hole is provided at the bottom of the inner wall of the groove. Two openings are provided on the power group body. A rear auxiliary spring is provided between the power group body and the rear cover. A clamp is provided in the power group body, and a piston push rod is provided in the clamp.

[0014] The fixture comprises:

[0015] The connecting part is slidably connected in the groove, the connecting part is fixedly engaged with the PFS sleeve, and a sliding part is provided on the connecting part, and the sliding part extends into the sliding hole. Two convex grooves are provided on the outer wall of the sliding part, and the convex blocks are clamped in the convex grooves. A push rod hole is provided in the sliding part, and two first slider grooves are provided on the inner wall of the push rod hole. A second slider groove is provided on the inner side wall of the first slider groove, and the inner wall inclined surface of the second slider groove is a guide inclined surface;

[0016] The piston push rod comprises:

[0017] A push rod, the push rod is slidably connected to the push rod hole, two sliding blocks are provided on the outer wall of the push rod, the sliding blocks are located in the second slider groove, a push rod groove is provided in the push rod, the plug column extends into the push rod groove, a main spring is provided between the push rod groove and the rear cover, and the main spring is sleeved on the plug column;

[0018] A piston rod, one end of which is connected to the push rod, and the other end of which passes through the connecting portion and extends into the PFS.

[0019] Preferably, the PFS sleeve container comprises:

[0020] The container body and the PFS sleeve are located inside the container body. A cylindrical tube is provided at one end of the container body, and a container hook is provided at the other end of the container body. The container hook is clamped on the pen body. Two first blocks are provided on the container body, and two arc-shaped spring pieces are symmetrically provided on the container body. A second block is provided on the arc-shaped spring pieces.

[0021] The end of the container body is connected to the end of the container hook, and there are two steps above and below. The steps are engaged with the inner steps inside the pen body;

[0022] Shrapnel card slots, two shrapnel card slots are symmetrically arranged on the container body, the shrapnel card slots are located between the cylindrical tube and the container hook, the shrapnel card slots are provided with shrapnel card slots, the shrapnel card slots are provided with support platform slots, and the shrapnel card slots are provided with shrapnel;

[0023] There are two semicircular holes in the shrapnel slot, the upper one is smaller and the lower one is larger;

[0024] The shrapnel comprises:

[0025] The support platform is rotatably connected to the upper small and lower large semicircular hole in the shrapnel slot through a rotating shaft. One end of the support platform extends into the support platform slot, and the other end of the support sleeve is provided with a support arm and a negative angle clamping platform.

[0026] Preferably, the trigger protection mechanism includes:

[0027] The protective shell is slidably connected to the pen body and is located between the secondary power unit and the pen cap. The protective shell includes:

[0028] The shell body has a through hole at one end, a plurality of card table holes, and the card table holes are adapted to the negative angle card table. The other end of the shell body is symmetrically provided with two arc-shaped trigger plates, and the arc-shaped trigger plates are provided with a first rectangular hole, a second rectangular hole and a third rectangular hole side by side. The arc-shaped trigger plates abut against the power group, the first block is located in the third rectangular hole, and the second block is located in the first rectangular hole.

[0029] The container body is located between two adjacent arc-shaped trigger plates;

[0030] The front auxiliary spring is arranged in the shell body, the front auxiliary spring is located between the inner wall of the shell body and the container body, and the front auxiliary spring is arranged close to the through hole.

[0031] Preferably, the protective plug includes:

[0032] The plug body is a cover-like structure with two track-shaped cards on its outer wall. The cards have anti-slip grooves on their surfaces and the plug body is connected to the pen body through the cards.

[0033] Protection sheet: two protection sheets are stacked on the inner wall of the bolt body. The protection sheet is located between the power group body and the arc sheet, and the protection sheet is also located between two adjacent limit sheets.

[0034] Preferably, a warning sticker is provided on the protective plug, and a plurality of pen body labels are provided on the pen body.

[0035] Preferably, the pen body is provided with a medicine viewing window, and the container body is provided with an observation hole, and the observation hole corresponds to the position of the medicine viewing window.

[0036] Preferably, detection holes are provided on the end of the pen barrel away from the pen barrel cover and on the pen cover, and the positions of the detection holes on the pen barrel and the pen cover correspond to each other.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] 1. The fixed-dose automatic injection pen described in the present invention is drawn out by opening the pen barrel cap. During the drawing out process, the pen barrel removes the pen cap, and then pulls out the protective plug, squeezing and triggering the protective mechanism. The triggering of the protective mechanism triggers the secondary power group, which drives the PFS sleeve to slide within the PFS sleeve container, thereby pushing out the PFS and performing the injection. After the injection is completed, the triggering protective mechanism rebounds and locks, thereby shielding the ejected needle and preventing the needle from being exposed to the outside world and causing harm to the user.

[0039] 2. When the pen barrel is opened, the present invention automatically pulls out the injection pen body and removes the PFS soft cap at the front end of the injection pen through the internal gear rack drive. Compared with existing products, the operation of removing the pen cap and the soft cap is reduced, the operation process is simplified, and the convenience and rescue time of first aid are greatly increased.

[0040] The present invention is a fixed-dose automatic injection pen. Other advantages, objectives and features of the present invention will be reflected in part by the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 It is a structural schematic diagram of the present invention;

[0043] Figure 2It is a structural schematic diagram of the pen body of the present invention;

[0044] Figure 3 It is an explosion diagram of the present invention;

[0045] Figure 4 is a schematic diagram of the pen body of the present invention;

[0046] Figure 5 This is a schematic diagram of the structure of the pull-out protection plug of the present invention;

[0047] Figure 6 This is a schematic structural diagram of the PFS sleeve container of the present invention;

[0048] Figure 7 Schematic diagram of the structure of the piston push rod of the present invention;

[0049] Figure 8 It is a structural schematic diagram of the clamp of the present invention;

[0050] Figure 9 It is a structural schematic diagram of the power group main body of the present invention;

[0051] Figure 10 It is a structural schematic diagram of the shrapnel of the present invention;

[0052] Figure 11 This is a schematic structural diagram of the protective plug of the present invention;

[0053] Figure 12 Schematic diagram of the structure of the protective shell of the present invention;

[0054] Figure 13 It is a structural schematic diagram of the back cover of the present invention;

[0055] Figure 14 A schematic diagram of a pen holder of the present invention;

[0056] Figure 15 is a schematic diagram of the pen body of the present invention;

[0057] Figure 16 A schematic diagram of pulling out the protective plug of the present invention;

[0058] Figure 17 This is a schematic structural diagram of the present invention when the needle is removed;

[0059] Figure 18 Schematic diagram of the structure of the PFS sleeve of the present invention;

[0060] Figure 19 Schematic diagram and cross-sectional view of the PFS of the present invention;

[0061] Figure 20 It is a structural schematic diagram of the molding device of the present invention;

[0062] Figure 21 It is a structural schematic diagram of the detection mechanism of the present invention;

[0063] Figure 22 It is a partial structural schematic diagram of the buffer device of the present invention;

[0064] Figure 23 It is a structural schematic diagram of the buffer device of the present invention;

[0065] Figure 24 It is a side structural schematic diagram of the buffer device of the present invention.

[0066] Explanation of the accompanying symbols: 1. Pen holder; 2. Pen holder cap; 3. Pen body; 4. Hook; 5. Pen cap; 6. Gear; 7. Rack; 8. Pen cap hook; 9. PFS sleeve container; 10. PFS sleeve; 11. PFS; 12. Back cover; 13. Protective bolt; 14. Power group body; 15. Opening; 16. Rear auxiliary spring; 17. Insert column; 18. Arc-shaped piece; 19. Sliding hole; 20. Groove; 21. Clamp; 23. Connecting part; 24. Sliding part; 25. Projection groove; 26. Push rod hole; 27. First slider groove; 28. Second slider groove; 29. ​​Piston push rod; 30. Push rod; 31. Piston rod; 32. Sliding block; 33. Push rod groove; 34. Main spring; 35. Container body; 36. Observation hole; 37. Arc-shaped spring piece; 38. Second block; 3 9. Container hook; 40. Cylindrical tube; 41. First block; 42. Spring slot; 43. Shrapnel; 44. Shrapnel slot; 45. Support platform slot; 46. Support platform; 47. Support arm; 48. Negative angle platform; 49. Protective shell; 50. Shell body; 51. Platform hole; 52. First rectangular hole; 53. Second rectangular hole; 54. Third rectangular hole; 55. Arc trigger plate; 56. Front auxiliary spring; 57. Plug body; 58. Card; 59. Protective sheet; 60. Warning sticker; 61. Drug viewing window; 62. Soft protective cap; 63. Detection hole; 64. Pen body label; 101. Bump; 102. Step; 103. Semicircular hole with smaller upper part and larger lower part; 104. Inclined surface; 105. Limiting step; 106. Limiting sheet; 107. Inner step; 108. Rectangular limiting frame. DETAILED DESCRIPTION

[0067] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0068] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0069] like Figures 1-19As shown, the present invention provides a fixed-dose automatic injection pen, comprising:

[0070] A pen barrel 1, wherein a pen body 3 is provided inside the pen barrel 1, a pen cover 5 is provided at one end of the pen body 3, a pen barrel cap 2 is provided at one end of the pen barrel 1, a back cover 12 is provided at the other end of the pen body 3, and a protective plug 13 is provided on the back cover 12;

[0071] A PFS sleeve container 9 is provided in the pen body 3, which is snapped onto the pen body 3. A PFS sleeve 10 is slidably provided in the PFS sleeve container 935, a PFS 11 is provided in the PFS sleeve 10, and a soft protective cap 62 is provided on the PFS 11. A secondary power group is provided between the PFS sleeve 10 and the back cover 12. A trigger protection mechanism is provided on the pen body 3, and the trigger protection mechanism is located between the pen cover 5 and the PFS sleeve container 9.

[0072] The working principle and beneficial effects of the above technical solution are as follows: during actual use, the pen holder cap 2 is opened to pull out the pen body 3. When pulling out, the pen holder 1 will remove the pen cover 5, and the pen cover 5 will remove the soft protective cap 62 together. Then the protective plug 13 is pulled out horizontally, squeezing the protective shell to trigger the protection mechanism. Triggering the protection mechanism will trigger the secondary power group. The movement of the secondary power group drives the PFS sleeve 10 to slide in the PFS sleeve container 9, thereby pushing out the PFS11 and injecting; after the injection is completed, the triggered protection mechanism will rebound and lock, thereby covering the popped-out needle to prevent the needle from being exposed to the outside world and easily causing secondary harm to the user.

[0073] In one embodiment, the pen holder cap 2 is provided with a gear 6, and the pen body 3 is provided with a rack 7, and the gear 6 is meshed with the rack 7;

[0074] The pen barrel 1 is provided with a hook 4 at one end away from the pen barrel cap 2 , which is engaged with the slot of the pen cover 5 . A plurality of pen cap hooks 8 are evenly arranged in the pen cover 5 , and the pen cap hooks 8 are engaged with the soft protective cap 62 .

[0075] The working principle and beneficial effects of the above technical solution: during actual use, when the pen barrel cover 2 is opened, the pen barrel cover 2 rotates, and the pen body 3 is driven to move a distance outside the pen barrel 1 through the gear 6 and the rack 7, thereby facilitating the removal of the pen body 3; at the same time, the hook 4 fixes the pen cap 5, so that when the pen body 3 is pulled out, the pen cap hook 8 can automatically pull out the soft protective cap 62, so that there is no need to add unnecessary actions to remove the soft protective cap before use, simplifying the operation process, avoiding operating errors, and improving usage efficiency.

[0076] In one embodiment, a plug post 17 is provided on the inner wall of the back cover 12, and two arc-shaped pieces 18 are symmetrically provided on the inner wall of the back cover 12. The two adjacent arc-shaped pieces 18 are located between the plug posts 17. A protrusion 101 is provided on the side of the arc-shaped piece 18 close to the plug post 17, and two limiting pieces 106 are provided on the side of the arc-shaped piece 18 away from the plug post 17.

[0077] A plurality of limiting steps 105 are provided on the inner wall of the rear cover 12 .

[0078] The working principle and beneficial effects of the above technical solution are as follows: the rear cover 12 is fixedly connected to the pen body 3, providing a power support point for the secondary power group. At the same time, the protrusion 101 provided on the arc-shaped piece 18 can limit the secondary power group and prevent the secondary power group from starting without triggering. At the same time, it can cooperate with the protective bolt 13 to lock the secondary power group. If the protective bolt 13 is not removed, the trigger mechanism cannot be triggered even if the protective shell 49 is pressed, thereby improving the stability of the entire injection pen.

[0079] In one embodiment, the secondary power pack includes:

[0080] The power pack body 14 is slidably connected to the inner wall of the pen body 3. A groove 20 is provided at the end of the power pack body 14 away from the rear cover. A sliding hole 19 is provided at the bottom of the inner wall of the groove 20. Two openings 15 are provided on the power pack body 14. A rear auxiliary spring 16 is provided between the power pack body 14 and the rear cover 12. A clamp 21 is provided in the power pack body 14, and a piston push rod 29 is provided in the clamp 21.

[0081] The fixture 21 includes:

[0082] The connecting portion 23 is slidably connected to the groove 20 and fixedly engaged with the PFS sleeve 10. The connecting portion 23 is provided with a sliding portion 24, which extends into the sliding hole 19. The outer wall of the sliding portion 24 is provided with two protrusion grooves 25, and the protrusion 101 is engaged in the protrusion grooves 25. The sliding portion 24 is provided with a push rod hole 26. The inner wall of the push rod hole 26 is provided with two first slider grooves 27. The inner side wall of the first slider groove 27 is provided with a second slider groove 28. The inner wall inclined surface of the second slider groove 28 is a guiding inclined surface.

[0083] The piston push rod 29 includes:

[0084] A push rod 30 is slidably connected to the push rod hole 26. Two sliding blocks 32 are provided on the outer wall of the push rod 30. The sliding blocks 32 are located in the second slider groove 28. A push rod groove 33 is provided in the push rod 30. The plug post 17 extends into the push rod groove 33. A main spring 34 is provided between the push rod groove 33 and the rear cover 12. The main spring 34 is sleeved on the plug post 17.

[0085] A piston rod 31 , one end of which is connected to the push rod 30 , and the other end of which passes through the connecting portion 23 and extends into the PFS 11 .

[0086] The working principle and beneficial effects of the above technical solution are as follows: in actual use, after the protective plug 13 is pulled out, the protective mechanism is triggered by squeezing, and the triggered protective mechanism will push the power group body 14 to move in the compression direction of the rear auxiliary spring 16, so that the power group body 14 and the clamp 23 slide relative to each other. When the opening 15 slides to above the protrusion 101 of the arc-shaped piece 18, the arc-shaped piece 18 loses the restriction of the power group body 14. Under the action of the main spring 34, the main spring 34 drives the clamp 21 to move in the extension direction of the main spring 34 through the sliding block 32 on the push rod 30. At the same time, the clamp 21 will drive the PFS sleeve 10 to move, thereby pushing the needle of the PFS11 out and piercing the injection site of the human body. After the clamp 21 drives the PFS sleeve 10 to move a certain distance, the connecting part 23 of the clamp 21 will abut against the PFS container sleeve 9, so that The clamp 21 cannot continue to drive the needle of PFS11 to continue to extend into the human body. At this time, the tip of the needle is in the optimal injection position; when the clamp 21 cannot continue to move, since the inner wall inclined surface of the second slide block 28 is a guiding inclined surface, the sliding block 32 will slide on the guiding inclined surface, causing the sliding block 32 to slide into the first slider groove 27, so that the main spring 34 will drive the push rod 30 and the clamp 21 to slide relative to each other, thereby causing the piston rod 31 to move in the extension direction of the main spring 34, thereby pushing the piston in the PFS11 to move, pushing out the liquid medicine in the PFS11, and completing the injection; the injection is completed by the secondary power group, so that the injection process is an injection design in which the needle is removed first and then the liquid medicine is pushed out, which can ensure the accuracy of liquid medicine dosage and the efficacy of intramuscular injection treatment, while ensuring that the medicine is injected at the optimal injection depth each time.

[0087] In one embodiment, the PFS cartridge container 9 comprises:

[0088] The container body 35 and the PFS sleeve 10 are located in the container body 35. A cylindrical tube 40 is provided at one end of the container body 35, and a container hook 39 is provided at the other end of the container body 35. The container hook 39 is clamped on the pen body 3. Two first blocks 41 are provided on the container body 35. Two arc-shaped spring pieces 37 are symmetrically provided on the container body 35. A second block 38 is provided on the arc-shaped spring piece 37.

[0089] The end of the container body 35 is connected to the end of the container hook 39 and has two steps 102 above and below. The steps 102 are engaged with the inner steps 107 inside the pen body 3;

[0090] The two spring clip slots 42 are symmetrically arranged on the container body 35. The spring clip slots 42 are located between the cylindrical tube 40 and the container hook 39. The spring clip slots 42 are provided with spring clip positioning grooves 44 and support platform grooves 45. The spring clip slots 42 are provided with spring clips 43.

[0091] There are two semicircular holes 103 in the spring clip slot 42, the upper one is smaller and the lower one is larger;

[0092] The spring piece 43 includes:

[0093] The support platform 46 is rotatably connected to the upper small and lower large semicircular hole 103 in the spring clip slot 42 through a rotating shaft. One end of the support platform 46 extends into the support platform slot 45. The other end of the support sleeve 46 is provided with a support arm 47 and a negative angle clamping platform 48, and the negative angle clamping platform 48 is provided with a slope 104.

[0094] The working principle and beneficial effects of the above technical solution: During actual use, a slot is provided in the container body 35 to limit the connection portion 23 of the clamp 21, so that the connection portion 23 cannot move forward after entering the container body 35.

[0095] The container body 35 can be quickly clamped inside the pen body through the elastic hook 39, which is convenient for rapid assembly during production; at the same time, the spring piece 43 can cooperate with the triggering protection mechanism.

[0096] Since there are support platforms 46 on both sides of the spring piece 43, the rotating shafts on both sides of the spring piece can only rotate clockwise in the rotating shaft holes of the container body. When the protective shell is pressed to start, the clamping hole 51 on the protective shell squeezes the inclined surface 104 of the negative angle clamping platform of the spring piece 43, squeezing the spring piece to rotate clockwise around the axis, and the negative angle clamping platform 48 of the spring piece disengages from the clamping platform hole 51 and engages. The PFS sleeve 10 moves to the bottom of the spring piece 43, and the outer cylindrical surface of the PFS sleeve 10 squeezes the bottom of the spring piece 43, so that the negative angle clamping platform 48 of the spring piece 43 can no longer hook the protective shell, and the protective shell can pop out for stroke protection.

[0097] In one embodiment, the trigger protection mechanism includes:

[0098] The protective shell 49 is slidably connected to the pen body 3 and is located between the secondary power unit and the pen cap 5. The protective shell 49 includes:

[0099] The housing body 50 has a through hole at one end and a plurality of clamping holes 51 therein. The clamping holes 51 are adapted to fit the negative angle clamping holes 48. Two arc-shaped trigger plates 55 are symmetrically provided at the other end of the housing body 50. The arc-shaped trigger plates 55 are provided with a first rectangular hole 52, a second rectangular hole 53, and a third rectangular hole 54 in parallel. The arc-shaped trigger plates 55 abut against the power pack. The first block 41 is located within the third rectangular hole 54, and the second block 38 is located within the first rectangular hole 52.

[0100] The container body 35 is located between two adjacent arc-shaped trigger plates 55;

[0101] The front auxiliary spring 56 is provided in the shell body 50 . The front auxiliary spring 56 is located between the inner wall of the shell body 50 and the container body 35 . The front auxiliary spring 56 is provided close to the through hole.

[0102] The working principle and beneficial effects of the above technical solution: During actual use, when injecting, the front end of the protective shell 49 contacts the injection site and is squeezed, which will cause the pen body 3 of the protective shell 49 to slide relative to each other. In this process, the negative angle card platform 48 is designed with a negative angle. When squeezed, the negative angle card platform 48 withdraws from the card platform hole 51, and the support arm 47 of the spring 43 collects the squeeze and deforms, causing the protective shell 49 to move in the compression direction of the rear auxiliary spring 16. The trigger plate 55 of the protective shell 49 will push the power group body 14 to move, thereby triggering the secondary power group to start injection; during the movement of the trigger plate 55, the second block 38 slides in the first rectangular hole 52, and the first block 41 slides in the third rectangular hole 54. After sliding a certain distance After separation, the first block 41 and the second block 38 will respectively abut the edges of the third rectangular hole 54 and the first rectangular hole 52, so that the protective shell 49 cannot continue to move inward, thereby preventing the injection position from being too deep; after the injection is completed, when the needle of the PFS11 is pulled out, the front auxiliary spring 56 performs a recovery deformation, driving the protective shell 49 to move away from the PFS sleeve container 9; in this process, the second block 38 will squeeze the arc-shaped spring piece 37 and then enter the second rectangular hole 53, and the first block 41 will withdraw from the third rectangular hole 54, thereby abutting the protective shell 49, preventing the protective shell 49 from moving toward the PFS sleeve container 9 after it is taken out after the injection, thereby restricting the pulled-out needle in the protective shell 49, avoiding the needle being exposed and causing harm to the user.

[0103] When the protective shell is pressed to start the first-stage needle ejection, the end of the protective shell pushes the power group body to move. The power group body moves to the position of the limit step 105 and stops. The limit step 105 limits the pressing distance.

[0104] In one embodiment, the protective plug 13 includes:

[0105] The plug body 57 is a cover-like structure. Two cards 58 are provided on the outer wall of the plug body 57. The cards 58 are in the shape of a runway and have anti-slip grooves on their surfaces. The plug body 57 is connected to the pen body 3 through the cards.

[0106] Protection sheet 59 : Two protection sheets 59 are stacked on the inner wall of the plug body 57 . The protection sheet 59 is located between the power group body 14 and the arc-shaped sheet 18 . The protection sheet 59 is also located between two adjacent limiting sheets 106 .

[0107] The working principle and beneficial effects of the above technical solution are as follows: the card 58 is provided with anti-slip grooves to facilitate the removal of the protective bolt during use. At the same time, when the protective bolt 13 is not removed, the protective sheet 59 of the protective bolt 13 will be located between the curved sheet 18 and the power pack body 35, further restricting the protrusion 101 on the curved sheet 18, making it impossible to trigger the secondary power pack; and the limiting sheet 106 on the curved sheet 18 will limit the protective sheet 59. The upper part of the curved sheet is limited by the inner wall of the power pack body 14. Even if the protective bolt is removed, the curved sheet 18 is still constrained to the inner wall of the sleeve of the power pack body 14, and the protective shell must still be pressed to activate it.

[0108] In one embodiment, a warning sticker 60 is provided on the protective plug 13 , and a plurality of pen body labels 64 are provided on the pen body 3 .

[0109] The working principle and beneficial effects of the above technical solution: Through the design of the above structure, the warning sticker 60 and the pen body label 64 can facilitate users to timely understand various information about the injection pen.

[0110] In one embodiment, the pen body 3 is provided with a medicine viewing window 61 , and the container body 35 is provided with an observation hole 36 , and the observation hole 36 corresponds to the position of the medicine viewing window 61 .

[0111] The working principle and beneficial effects of the above technical solution are as follows: The drug viewing window 61 and the observation hole 36 can facilitate the user to observe the drug, confirm whether the drug is turbid, discolored or deteriorated, and determine whether the injection pen needs to be replaced.

[0112] In one embodiment, detection holes 63 are provided on the end of the pen barrel 1 away from the pen barrel cover 2 and the pen cover 5 , and the positions of the detection holes on the pen barrel 1 and the pen cover 5 correspond to each other.

[0113] The working principle and beneficial effects of the above technical solution are as follows: When the pen body 3 is inside the pen barrel 1, a detector can be inserted into the detection hole 63 to trigger the protection mechanism, thereby determining whether the power pack is locked. This can also determine whether the cumulative elastic force of the front and rear auxiliary springs is within the specification, and whether the mating parts are sliding smoothly, resulting in excessive resistance.

[0114] In one embodiment, the PFS sleeve 10 is cylindrical, and two rectangular limit frames 108 are provided on the outer wall of the PFS sleeve 10. The rectangular limit frames 108 are slidably connected to the PFS sleeve container 9;

[0115] The working principle and beneficial effects of the above technical solution are as follows: the rectangular limiting frame 108 serves to limit the PFS sleeve 10 .

[0116] In one embodiment, the prefilled syringe PFS uses a conventional disposable prefilled syringe that only requires the needle to be replaced, which greatly reduces the production process, improves the yield and reduces costs. In addition, the prefilled syringe is small in size and does not take up space, and can reliably provide accurate drug dosage with low contamination risk.

[0117] Advantages:

[0118] By using conventional slender PFS, only the needle needs to be replaced, which greatly reduces the difficulty of drug packaging material processing and shortens the procurement cycle.

[0119] The conventional slim PFS is sealed with a silicone soft cap before use to ensure that the liquid is sealed and not contaminated. The soft cap can be removed without any unnecessary action before use.

[0120] The two-step operation method is consistent with the original research pen, which is suitable for the habitual operation of patients and medical staff, reducing the occurrence of usage errors.

[0121] like Figure 20-24 As shown, the present invention also provides a production process for a fixed-dose automatic injection pen, comprising the following steps:

[0122] Step 1: Replace the mold on the molding device according to the required components:

[0123] Step 2: Start the molding device, injection mold the corresponding components, and clean the surface of the components:

[0124] Step 3: Select the corresponding components for assembly. Install the trigger guard mechanism, secondary power pack, and PFS into the PFS sleeve container. Install them together with the back cover and protective plug into the pen body. Put the pen cap on, making sure the PFS soft cap is locked into the pen cap hook. Then attach the pen body label.

[0125] Step 4: Insert the assembled pen body into the pen barrel so that the pen barrel and the pen cap are connected, install the pen barrel cap, and complete the production.

[0126] In one embodiment, the forming device comprises:

[0127] An injection molding machine 70 is provided with an injection cavity 74, a movable mold 71 and a fixed mold 72 are provided in the injection cavity 74, the fixed mold 72 is connected to the inner wall of the injection cavity 74 via a mounting block 73, and a molding cavity 75 is provided on both the fixed mold 72 and the movable mold 71. The injection molding machine 70 is electrically connected to a controller;

[0128] Detection mechanism, the detection mechanism is arranged in the mounting block 73, and the detection mechanism includes:

[0129] An air inlet pipe 76, one end of which is connected to the molding cavity 75, and the other end of which passes through the mounting block 73. A pressure valve 77 and an air volume sensor 78 are provided in the air inlet pipe 76, and the air volume sensor 78 is electrically connected to the controller;

[0130] Conical cavity 79, which is provided in mounting block 73 and is located below air inlet pipe 76, has a stopper 81 slidably connected therein, with one side of stopper 81 flush with the inner wall of forming cavity 74, and a fixing plate 83 provided on the inner wall of conical cavity 79, with a detection spring 84 and a telescopic rod 82 provided between the fixing plate 83 and stopper 81;

[0131] The exhaust pipe 80 has one end connected to the tapered cavity 79 and the other end connected to the exhaust fan.

[0132] The working principle and beneficial effects of the above technical solution are as follows: after the fixed mold 72 and the movable mold 71 are merged, the vacuum pump is started, and the vacuum pump drives the air to be discharged from the conical cavity 79 through the vacuum pipe 80, so that the conical cavity 79 forms a negative pressure, and the stopper 81 moves in the compression direction of the spring 84, so that the air in the molding cavity 75 is extracted, and the molding cavity 75 forms a negative pressure; when the molding cavity 75 is in a good sealing effect, air enters the molding cavity 75 through the air inlet pipe 76. At this time, the air volume sensor 78 will detect a value, indicating that the airtightness of the molding cavity 75 is good, and the injection molding machine injects into the molding cavity 75 to produce components; when no value is detected, it indicates that the airtightness of the molding cavity 75 is poor, and the injection molding machine will not perform injection molding. At the same time, a reminder is issued to remind the staff to perform inspection to avoid inaccurate fit between the movable mold and the fixed mold or deformation of the mold, which leads to leakage of plastic liquid after being injected into the molding cavity 75, resulting in failure of component molding, thereby saving costs.

[0133] In one embodiment, a buffer device is further provided in the injection cavity 74, and the buffer device includes:

[0134] Belt conveyor 98, belt conveyor 98 is arranged in the injection cavity 74, and horizontal bars 99 are evenly arranged on the belt conveyor 98;

[0135] The fixing plate 91 has two ends parallel to the injection cavity 74 through support rods, and the bottom end of the fixing plate 91 is parallel to the adjustment plate 92. The bottom end of the fixing plate 91 is provided with a shooting visual detector;

[0136] T-shaped rods 96, one end of the plurality of T-shaped rods 96 is connected to the top of the adjustment plate 92, and the other end of the T-shaped rod 96 passes through the fixed plate 91, and an adjustment spring 97 is provided between the T-shaped rod 96 and the fixed plate 91;

[0137] A rotating rod 95, one end of which is connected to a motor, which is provided at the top of the fixed plate 91, and the other end of which is connected to a pressing wheel 94. The rotating rod 95 rotates through an auxiliary block, which is fixed at the top of the fixed plate 91, and the pressing wheel 94 passes through the fixed plate 91 and abuts against the top of the adjustment plate 92;

[0138] The mounting block 89 is fixed on the inner wall of the injection cavity 74. The mounting block 89 is provided with a component through hole 100. Two electric telescopic rods 88 are symmetrically provided on the inner wall of the component through hole 100. The electric telescopic rods 88 are provided with a lower connecting strip 87;

[0139] Upper connecting bar 85, the bottom ends of the fixed mold 72 and the movable mold 71 are both provided with an upper connecting bar 85;

[0140] A flexible cloth bag 86, wherein both sides of the top of the flexible cloth bag 86 are connected to two adjacent upper connecting strips 85, and both sides of the bottom of the flexible cloth bag 86 are connected to two adjacent lower connecting strips 87;

[0141] The air jet pipes 90 have one end connected to the inner wall of the bottom end of the flexible bag 86, and the other end of the air jet pipes 90 is connected to the fan.

[0142] The working principle and beneficial effects of the above technical solution: During actual use, when the fixed mold 72 and the movable mold 71 are separated after processing, the movable mold 71 will drive the top side of the flexible cloth bag 86 to move, so that the flexible cloth bag 86 opens. After the mold is opened, the internal components fall into the flexible cloth bag 86. During the falling process, the components will first be decelerated and cleaned by the gas ejected from the air nozzle 90. At the same time, the gas will be further cooled by the components, so that the interior of the components and the detailed positions are quickly cooled and shaped, so that the components are completely shaped to avoid deformation. When the shaped components contact the flexible cloth bag 86, the flexible cloth bag 86 will be slightly deformed, thereby buffering the falling components, preventing the components from falling directly onto the conveying mechanism and deforming, thereby improving the yield rate of the molding device. ; After the original drop, the gas ejected from the jet pipe 90 is sprayed on the inner wall of the mold through the flexible cloth bag 86 to avoid the residue inside the mold during subsequent processing that affects the subsequent component production; and the flexible cloth bag 86 is set close to the mold to prevent the components from falling everywhere; after the components have fallen, the electric telescopic rod 88 contracts, so that the bottom end of the flexible cloth bag 86 opens, and the components fall onto the belt conveyor 98 and are transported, and then visually inspected when passing through the visual detector. In this process, the motor drives the pressure wheel 94 to rotate through the rotating rod 95. When the pressure wheel 94 rotates, it drives the adjustment plate 82 to move up and down. In this cycle, the center of gravity of the parts can be fine-tuned in turn, so that the position of the components in the photo output by the visual detector 93 is similar to the standard file, which is convenient for comparison, thereby facilitating the screening of defective products.

[0143] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0144] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0145] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A fixed-dose automatic injection pen, characterized in that: include: A pen barrel (1), wherein a pen body (3) is provided inside the pen barrel (1), a pen cover (5) is provided at one end of the pen body (3), a pen barrel cap (2) is provided at one end of the pen barrel (1), a rear cover (12) is provided at the other end of the pen body (3), and a protective bolt (13) is provided on the rear cover (12); A PFS sleeve container (9) is provided in the pen body (3), the PFS sleeve container (9) is snap-connected to the pen body (3), a PFS sleeve (10) is slidably provided in the PFS sleeve container (935), a PFS (11) is provided in the PFS sleeve (10), a soft protective cap (62) is provided on the PFS (11), a secondary power group is provided between the PFS sleeve (10) and the rear cover (12), a trigger protection mechanism is provided on the pen body (3), and the trigger protection mechanism is located between the pen cover (5) and the PFS sleeve container (9); The secondary power group comprises a power group body (14), a clamp (21) is slidably provided in the power group body (14), a piston push rod (29) is slidably provided in the clamp (21), and a main spring (34) is provided between the piston push rod (29) and the rear cover (12); The PFS sleeve container (9) comprises a container body (35), the PFS sleeve (10) is located in the container body (35), one end of the container body (35) is provided with a cylindrical tube (40), the other end of the container body (35) is provided with a container hook (39), the container hook (39) is clamped on the pen body (3), the container body (35) is provided with two first blocks (41), the container body (35) is symmetrically provided with two arc-shaped spring pieces (37), and the arc-shaped spring pieces (37) are provided with a second block (38); The trigger protection mechanism includes: The protective shell (49) is slidably connected to the pen body (3). The protective shell (49) is located between the secondary power group and the pen cover (5). The protective shell (49) includes: A shell body (50), one end of which is symmetrically provided with two arc-shaped trigger plates (55), a first rectangular hole (52), a second rectangular hole (53) and a third rectangular hole (54) being arranged side by side on the arc-shaped trigger plate (55), the arc-shaped trigger plate (55) being in contact with the power group, the first block (41) being located in the third rectangular hole (54), and the second block (38) being located in the first rectangular hole (52); The container body (35) is located between two adjacent arc-shaped trigger plates (55).

2. A fixed-dose automatic injection pen according to claim 1, characterized in that: The pen holder cap (2) is provided with a gear (6), the pen body (3) is provided with a rack (7), and the gear (6) is meshed with the rack (7); The pen barrel (1) is provided with a hook (4) at one end away from the pen barrel cap (2), the hook (4) being engaged with a slot of the pen cover (5), a plurality of pen cap hooks (8) being evenly arranged in the pen cover (5), and the pen cap hooks (8) being engaged with the soft protective cap (62).

3. The fixed-dose automatic injection pen according to claim 1, characterized in that: The inner wall of the rear cover (12) is provided with an insertion column (17), and two arc-shaped pieces (18) are symmetrically provided on the inner wall of the rear cover (12), and the two adjacent arc-shaped pieces (18) are located between the insertion columns (17). A protrusion (101) is provided on the side of the arc-shaped piece (18) close to the insertion column (17), and two limiting pieces (106) are provided on the side of the arc-shaped piece (18) away from the insertion column (17).

4. The fixed-dose automatic injection pen according to claim 3, characterized in that: The power group body (14) is slidably connected to the inner wall of the pen body (3); a groove (20) is provided at one end of the power group body (14) away from the rear cover; a sliding hole (19) is provided at the bottom end of the inner wall of the groove (20); two openings (15) are provided on the power group body (14); and a rear auxiliary spring (16) is provided between the power group body (14) and the rear cover (12); The clamp (21) comprises: A connecting portion (23) is slidably connected to the groove (20), and the connecting portion (23) is fixedly connected to the PFS sleeve (10). A sliding portion (24) is provided on the connecting portion (23), and the sliding portion (24) extends into the sliding hole (19). Two convex block grooves (25) are provided on the outer wall of the sliding portion (24), and the convex block (101) is clamped in the convex block groove (25). A push rod hole (26) is provided in the sliding portion (24), and two first slider grooves (27) are provided on the inner wall of the push rod hole (26). A second slider groove (28) is provided on the inner side wall of the first slider groove (27), and the inner wall inclined surface of the second slider groove (28) is a guide inclined surface. The piston push rod (29) comprises: A push rod (30), wherein the push rod (30) is slidably connected to the push rod hole (26), two sliding blocks (32) are provided on the outer wall of the push rod (30), the sliding blocks (32) are located in the second slider groove (28), a push rod groove (33) is provided in the push rod (30), the plug post (17) extends into the push rod groove (33), a main spring (34) is provided between the push rod groove (33) and the rear cover (12), and the main spring (34) is sleeved on the plug post (17); A piston rod (31), one end of the piston rod (31) is connected to the push rod (30), and the other end of the piston rod (31) passes through the connecting portion (23) and extends into the PFS (11).

5. The fixed-dose automatic injection pen according to claim 1, characterized in that: The end of the container body (35) is connected to the end of the container hook (39), and two steps (102) are provided above and below the end of the container body (3). The steps (102) are engaged with the inner steps (107) in the pen body (3); The PFS sleeve container (9) further comprises: Shrapnel card slots (42), two shrapnel card slots (42) are symmetrically arranged on the container body (35), the shrapnel card slots (42) are located between the cylindrical tube (40) and the container hook (39), a shrapnel card slot (44) is provided in the shrapnel card slots (42), a support platform slot (45) is provided in the shrapnel card slots (42), and the shrapnel card slots (42) are provided with shrapnel (43); Two semicircular holes (103) with a smaller upper portion and a larger lower portion are provided in the spring clip slot (42); The shrapnel (43) comprises: The support platform (46) is rotatably connected to the upper small and lower large semicircular hole (103) in the shrapnel clamping slot (42) through a rotating shaft. One end of the support platform (46) extends into the support platform groove (45). The other end of the support sleeve (46) is provided with a support arm (47) and a negative angle clamping platform (48).

6. The fixed-dose automatic injection pen according to claim 5, characterized in that: One end of the shell body (50) is provided with a through hole, and the shell body (50) is provided with a plurality of clamping platform holes (51), and the clamping platform holes (51) are adapted to the negative angle clamping platform (48). The front auxiliary spring (56) is arranged in the shell body (50), the front auxiliary spring (56) is located between the inner wall of the shell body (50) and the container body (35), and the front auxiliary spring (56) is arranged close to the through hole.

7. The fixed-dose automatic injection pen according to claim 6, characterized in that: The protective plug (13) comprises: The plug body (57) is a cover-shaped structure. Two cards (58) are provided on the outer wall of the plug body (57). The cards (58) are in the shape of a runway. The surface of the cards (58) is provided with anti-slip grooves. The plug body (57) is connected to the pen body (3) through the cards. The protective sheet (59) is stacked on the inner wall of the bolt body (57) and is provided with two protective sheets (59). The protective sheet (59) is located between the power group body (14) and the arc-shaped sheet (18). The protective sheet (59) is also located between two adjacent limiting sheets (106).

8. The fixed-dose automatic injection pen according to claim 1, characterized in that: A warning sticker (60) is provided on the protective plug (13), and a plurality of pen body labels (64) are provided on the pen body (3).

9. The fixed-dose automatic injection pen according to claim 1, characterized in that: The pen body (3) is provided with a medicine viewing window (61), and the container body (35) is provided with an observation hole (36), and the observation hole (36) corresponds to the position of the medicine viewing window (61).

10. The fixed-dose automatic injection pen according to claim 1, characterized in that: The pen barrel (1) is provided with a detection hole (63) at one end away from the pen barrel cover (2) and on the pen cover (5), and the detection holes (63) on the pen barrel (1) and the pen cover (5) are positioned correspondingly.

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