CN115089810A - Pen type injection device - Google Patents
Pen type injection device Download PDFInfo
- Publication number
- CN115089810A CN115089810A CN202210791386.7A CN202210791386A CN115089810A CN 115089810 A CN115089810 A CN 115089810A CN 202210791386 A CN202210791386 A CN 202210791386A CN 115089810 A CN115089810 A CN 115089810A
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- scale
- main body
- driving shaft
- trigger
- wall
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- 238000002347 injection Methods 0.000 title claims abstract description 108
- 239000007924 injection Substances 0.000 title claims abstract description 108
- 239000003814 drug Substances 0.000 claims abstract description 63
- 229940079593 drug Drugs 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 238000012377 drug delivery Methods 0.000 claims abstract description 4
- 229940090048 pen injector Drugs 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000001647 drug administration Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
- A61M5/3159—Dose expelling manners
- A61M5/31593—Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3202—Devices for protection of the needle before use, e.g. caps
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention relates to the technical field of drug administration and injection, and discloses a pen type injection device, which comprises: a cartridge, one end of which is provided with an injection needle; a main body disposed at the other end of the cartridge; the drug delivery mechanism is arranged in the main body and comprises a plug part and a connecting part, wherein the plug part is matched with the inner wall of the drug cylinder in size, and one end of the plug part extends into the drug cylinder; the scale is arranged in the main body, the scale is arranged in a spiral shape and sleeved outside the connecting part, and the scale is matched with the main body; the trigger is arranged at one end of the main body, which is back to the medicine cylinder, and is connected with the scale and the connecting part; the rewinding ring is sleeved on the outer side of the medicine cylinder and connected with the connecting part to drive the plug part to reset. Multiple injections can be scientifically and quantitatively performed, so that the injection requirement that a user can perform multiple injections without dosage after single filling is met, the times of filling medicines are reduced, and the time cost of injection and the waste of human resources are reduced.
Description
Technical Field
The invention relates to the technical field of drug administration and injection, in particular to a pen type injection device.
Background
The pen type medicine-feeding injection device is one device combining medicine and syringe and consists of mainly trigger, main body, driving unit, power accumulating unit, medicine cartridge and needle. The medicament is stored in a cartridge, typically in conjunction with a particular injection device. When in use, the safety cap is taken down, the disposable injection needle is installed, the air is exhausted, and the medicine delivery is realized by adjusting the required dosage and driving the trigger. At present, the conventional injection device generally adopts a structure that the medicine is loaded once and is directly injected after one dose is set. The injection amount of the medicine is single and fixed, the setting of the dose is unidirectional, the delivery amount of the medicine is fixed every time, the medicine cannot be scientifically and quantificationally controlled and delivered for multiple times, and the delivery requirement of a customer for multiple injections without the dose cannot be met; moreover, the medicine needs to be filled for many times of injection, which wastes human resources and improves the time cost of injection.
Disclosure of Invention
The purpose of the invention is: the pen-type injection device can carry out multiple injections scientifically and quantitatively, so that the injection requirement that a user can carry out multiple injections without dosage after filling once is met, the times of filling medicines are reduced, and the time cost of injection and the waste of human resources are reduced.
In order to achieve the above object, the present invention provides a pen type injection device comprising:
a cartridge having an injection needle disposed at one end thereof;
a body arranged at an end of the cartridge facing away from the injection needle;
the drug delivery mechanism is arranged in the main body and comprises a plug part which is matched with the inner wall of the drug cylinder in size, and one end of the plug part extends into the drug cylinder;
the scale is arranged in the main body, the scale is spirally arranged and sleeved outside the connecting part, and the scale is matched with the main body to control the moving distance of the connecting part;
the trigger is arranged at one end, back to the medicine cartridge, of the main body and is connected with the scale and the connecting part;
the rewinding ring is sleeved on the outer side of the medicine cylinder and connected with the connecting part so as to drive the plug part to reset.
Compared with the prior art, the pen type injection device provided by the embodiment of the invention has the beneficial effects that: before the injection, put into the medicine of treating the injection in the cartridge case, install the cartridge case on heavily encircling again, rotate the trigger, drive the direction removal of scale towards the cartridge case, after reacing predetermined calibration value, press the trigger towards the cartridge case direction, the restriction of trigger contact connecting portion triggers connecting portion, makes connecting portion move towards the cartridge case direction, promotes the stopper portion and removes and promote the medicine to the syringe needle direction in the cartridge case, finally pours into the human body into through the syringe needle. After the injection is finished, the trigger drives the scale to return to the original position, and the calibration of the next injection value can be carried out by rotating the trigger again. The device enables the pen type drug delivery injector to carry out multiple injections scientifically and quantitatively, so that the injection requirement that a user can carry out multiple injections without dosage after single filling is met, the times of filling drugs are reduced, and the time cost of injection and the waste of human resources are reduced.
According to the pen-type injection device provided by the embodiment of the invention, the connecting part comprises a clutch, an outer driving shaft and an inner driving shaft, the clutch is connected with the scale and the trigger, the clutch is sleeved on the outer side of the outer driving shaft, the outer driving shaft is sleeved on the outer peripheral surface of the inner driving shaft and can drive the inner driving shaft, and a plunger connected with the plug part is arranged in the inner driving shaft.
In the pen injection device according to an embodiment of the present invention, a torsion spring is provided between the inner drive shaft and the outer drive shaft, and the torsion spring is connected to the inner drive shaft and the outer drive shaft, respectively.
In a pen injector according to an embodiment of the present invention, one end of the recoil ring is coupled to the torsion spring to compress and store the torsion spring.
In the pen injection device according to the embodiment of the present invention, the outer wall surface of the clutch is provided with first ratchet teeth on a side facing the recoil ring, and the inner wall of the body is provided with inner wall ribs engaged with the first ratchet teeth.
In the pen injection device according to an embodiment of the present invention, a second ratchet tooth is provided on a side of an outer wall surface of the clutch facing the trigger, the second ratchet tooth is opposite to the first ratchet tooth in direction, and a rib groove engaged with the first ratchet tooth is provided on a side of the trigger facing the clutch.
In the pen-type injection device according to the embodiment of the present invention, an outer rib is provided on an outer end surface of the outer drive shaft in a direction close to the trigger, and a flat wall is provided close to the cartridge, an inner rib matching with the outer rib is provided on an inner wall surface of the clutch, and an inner wall groove matching with the outer rib is also provided on an inner wall of the scale.
According to the pen-type injection device provided by the embodiment of the invention, the stop wall facing the scale is arranged on the circumferential direction of the main body, the abutting surface facing the stop wall is arranged on one side of the scale, and the distance between the stop wall and the abutting surface after the dose setting is finished is the axial rotation stroke of the scale.
In the pen-type injection device according to the embodiment of the present invention, a biasing spring for returning is provided on an end surface of the trigger facing the main body, and a mounting plane for supporting the biasing spring is set on an inner wall surface of the main body.
According to the pen-type injection device provided by the embodiment of the invention, the spiral rib matched with the scale is arranged on the inner wall surface of the main body, and the observation window is arranged on the outer side of the spiral rib of the main body so as to observe the reading of the scale.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Figure 1 is a schematic exploded view of a pen injection device according to an embodiment of the present invention;
figure 2 is a schematic structural view of an exploded body of a pen injection device according to an embodiment of the present invention;
figure 3 is a schematic structural view of a disassembled trigger of a pen injection device according to an embodiment of the present invention;
figure 4 is a schematic structural view of an exploded rewind ring of a pen injection device according to an embodiment of the present invention;
figure 5 is a structural schematic view of an exploded ratchet sleeve of a pen injection device according to an embodiment of the present invention;
figure 6 is a schematic view of the exploded scale of a pen injection device according to an embodiment of the present invention;
figure 7 is a schematic structural view of a disassembled clutch of a pen injection device according to an embodiment of the present invention;
figure 8 is a schematic view of the exploded outer drive wheel of a pen injection device according to an embodiment of the present invention;
figure 9 is a schematic view of the exploded plunger of a pen injection device according to an embodiment of the present invention.
In the figure, 1, the cartridge; 2. an injection needle; 3. a safety helmet; 4. a main body; 41. a third snap groove; 42. a helical rib; 43. an observation window; 44. stopping the retaining wall; 45. a mounting plane; 46. an inner wall rib; 47. a tick rib; 48. a trigger slot; 6. a trigger; 61. a rib groove; 62. an elastic contact piece; 63. a finger portion; 7. a rewinding ring; 71. ratchet teeth; 72. a counter bore; 73. a bump; 8. a ratchet sleeve; 81. a positioning column; 82. a third buckle; 9. a scale; 91. a graduated scale; 92. an abutting surface; 93. an inner wall groove; 10. a biasing spring; 11. a clutch; 111. a first ratchet tooth; 112. a second ratchet tooth; 113. an inner rib; 12. an outer drive shaft; 121. an outer rib; 122. a flat wall; 13. an inner drive shaft; 14. a torsion spring; 15. a plunger; 151. a long groove; 16. a plug portion.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings only for the convenience of description of the present invention and simplification of the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, a pen-type injection device according to a preferred embodiment of the present invention includes a cartridge 1, an injection needle 2 for injecting medicine is disposed at one end of the cartridge 1, a safety cap 3 is further connected to the cartridge 1 at an outer side of the injection needle 2, and the safety cap 3 is used for protecting the injection needle 2 when the syringe is not in use, so as to prevent accidents. One side of the medicine cylinder 1, which is back to the injection needle 2, is fixed on a rewinding ring 7 through threads, the rewinding ring 7 adopts a step arrangement, and a holding part with a larger diameter is used for rotating and resetting, and a connecting part with a smaller diameter is used for connecting the main body of the device, so that the main body is connected to one end, which is back to the medicine cylinder 1, of the rewinding ring 7.
As shown in fig. 1, a pen-type injection device according to a preferred embodiment of the present invention further includes a main body 4, the main body 4 is disposed at an end of the drug cartridge 1 facing away from the injection needle 2, the main body 4 is configured to be hollow and cylindrical, and the inner wall surface of the main body 4 is provided with various grooves and ribs to meet the assembly and work requirements of different components; the inside of main part 4 is provided with the mechanism of dosing, and the mechanism of dosing includes cock portion 16 and connecting portion, and wherein cock portion 16 and the size cooperation of the inner wall of medicine section of thick bamboo 1 and one end stretch into in the medicine section of thick bamboo 1, and the connecting portion then connects cock portion 16 in the outside of medicine section of thick bamboo 1 in order to provide the power of business turn over medicine section of thick bamboo 1 to cock portion 16, and the connecting portion still is connected with other parts of syringe. The inside of the main body 4 is also provided with a scale 9, the scale 9 extends into the inside of the main body 4 and is matched with the inner wall surface of the main body 4, the scale 9 is arranged in a spiral shape and is sleeved outside the connecting part, the scale 9 is matched with the main body 4 to control the moving distance of the connecting part, and the stroke of the scale 9 moving in the main body 4 can determine the dose required by one-time injection; one end of the scale 9, which is back to the medicine cartridge 1, is connected with the trigger 6, the trigger 6 is arranged at one end of the main body 4, which is back to the medicine cartridge 1, the trigger 6 is connected with the scale 9 and the connecting part, the trigger 6 is in a shell shape and is arranged at the tail end of the main body 4, and the trigger 6 can change the stroke of the scale 9 when being pressed or rotated so as to adjust the stroke of the scale 9 moving in the main body 4.
Before the injection, put into the medicine of treating the injection in cartridge case 1, install cartridge case 1 on rewinding ring 7 again, rotate trigger 6, drive scale 9 and remove towards the direction of cartridge case 1, after reaching the preset calibration value, press trigger 6 towards cartridge case 1 direction, the restriction of trigger 6 contact connecting portion triggers connecting portion, make connecting portion move towards cartridge case 1 direction, promote cock portion 16 and remove and promote the medicine to syringe needle 2 direction in cartridge case 1, finally pour into the human body through syringe needle 2. After one injection is finished, the trigger 6 drives the scale 9 to return to the original position, and at the moment, the trigger 6 is rotated again, so that the calibration of the next injection value can be carried out.
As shown in fig. 4 and 5, in some embodiments of the present invention, a rewinding ring 7 is further included, and the rewinding ring 7 is sleeved on the outside of the medicine cartridge 1 and connected to the connecting portion to reset the plug portion 16 when the medicine is initially filled. In particular, the side of the rewinding ring 7 facing the injection needle 2 is provided with a thread for fixing the safety cap 3. The outer circumferential surface of the end of the rewinding ring 7 with the smaller diameter is sleeved with a ratchet sleeve 8, the outer circumferential surface of the rewinding ring 7 facing the ratchet sleeve 8 is provided with two ratchet teeth arranged in opposite directions, and the inner circumferential surface of the ratchet sleeve 8 is provided with two positioning columns 81 matched with the ratchet teeth, so that the ratchet sleeve 8 can be stably fixed on the rewinding ring 7, and the rotation of the rewinding ring 7 is limited between the two positioning columns 81. The side of the ratchet sleeve 8 facing the main body 4 is provided with a third buckle 82, one end of the main body 4 close to the ratchet sleeve 8 is provided with a third buckle groove 41, the third buckle 82 and the third buckle groove 41 are matched to enable the ratchet sleeve 8, the rewinding ring 7 and the main body 4 to form a synchronous component, and the main body 4 provides unidirectional rotation limitation in the rotation movement process of the rewinding ring 7.
As shown in fig. 2 and 6, in some embodiments of the present invention, the inner wall surface of the body 4 is provided with a spiral rib 42 engaged with the scale 9, and the spiral rib 42 is engaged with the rotation angle and length of the scale 9 so that the scale 9 can be axially moved in the body 4 with the rotation of the trigger 6; the main body 4 is provided with an observation window 43 at the outer side of the spiral rib 42 to observe the reading of the scale 9, so that a user can conveniently check the reading on the scale 9 when rotating the trigger 6 to accurately grasp the medicine amount required by the injection. The scale 9 is arranged spirally, and the outer end face of the scale 9 is provided with scales 91 which are distributed at intervals.
In some embodiments of the invention, as shown in fig. 2 and 6, the body 4 is circumferentially provided with a stop wall 44 facing the scale 9, one side of the scale 9 is provided with an abutment surface 92 facing the stop wall 44, the trigger 6 is rotated such that the abutment surface 92 of the scale 9 is gradually moved away from the stop wall 44, and the distance between the stop wall 44 and the abutment surface 92 after the dose setting is completed is the axial rotational travel of the scale 9. After the injection is completed, the abutment surface 92 of the scale 9 abuts against the stopper wall 44, so that it is restrained by the body 4. When the trigger 6 is rotated, the distance between the stop wall 44 of the body 4 and the scale 9 is adjusted in proportion to the stroke of the plunger during the injection, and the stroke of the plug 16 in the cartridge 1 and thus the amount of drug dispensed from the cartridge 1 can be controlled.
As shown in fig. 1, in some embodiments of the present invention, a biasing spring 10 for returning is provided on an end surface of the trigger 6 facing the main body 4, and a mounting plane 45 supporting the biasing spring 10 is set on an inner wall surface of the main body 4. The biasing spring 10 is pressed towards the mounting plane 45 when the trigger 6 is rotationally moved in a direction towards the cartridge 1 bringing the scale 9, and then loses its restraining force on the trigger 6 after the trigger 6 is pressed down to complete the injection, and the biasing spring 10 exerts a force in the opposite direction to press the trigger 6 and the scale 9 back to the initial position ready for the next calibrated injection.
In some embodiments of the invention, as shown in figure 1, the coupling comprises a clutch 11, an outer drive shaft 12 and an inner drive shaft 13, the clutch 11 coupling the scale 9 and the trigger 6 and being axially moveable with the trigger 6, the clutch 11 being axially located between the trigger 6 and the scale 9.
As shown in fig. 2 and 7, in some embodiments of the present invention, the outer wall surface of the clutch 11 is provided with first ratchet teeth 111 on a side facing the recoil ring 7, the first ratchet teeth 111 are provided to be elastically deformable, the inner wall of the body 4 is provided with an inner wall rib 46 engaged with the first ratchet teeth 111, and the clutch 11 is rotatable in the direction of the first ratchet teeth 111 inside the body 4 in the dose setting step while the engagement of the inner wall rib 46 with the first ratchet teeth 111 prohibits the reverse rotation of the clutch 11.
As shown in fig. 3 and 7, in some embodiments of the present invention, a side of the outer wall surface of the clutch 11 facing the trigger 6 is provided with second ratchet teeth 112, the second ratchet teeth 112 are opposite to the first ratchet teeth 111, and a side of the trigger 6 facing the clutch 11 is provided with rib grooves 61 engaged with the first ratchet teeth 111, such that the trigger 6 rotates in one direction to drive the clutch 11 to rotate synchronously, but does not drive the clutch 11 to rotate reversely when the trigger 6 is pressed and released.
As shown in fig. 8 and 7, the clutch 11 is sleeved outside the outer driving shaft 12, an outer rib 121 close to the trigger 6 and a flat wall 122 close to the cartridge 1 are arranged on the outer end face of the outer driving shaft 12, an inner rib 113 matched with the outer rib 121 is arranged on the inner wall face of the clutch 11, and when the clutch 11 is in a holding state, that is, the trigger 6 rotates to adjust the amount of medicine to be injected, the inner rib 113 of the clutch 11 is in contact with the outer rib 121 of the outer driving shaft 12 to drive the outer driving shaft 12 to synchronously rotate and accumulate force; when the clutch 11 is in the released state, i.e. when the trigger 6 is pressed to start the injection of the syringe, the clutch 11 is moved axially and the inner ribs 113 of the clutch 11 move away from the outer ribs 121 of the outer drive shaft 12 to the outside of the flat wall 122, causing the outer drive shaft 12 to be released and begin rotating in the opposite direction to the calibration process.
As shown in fig. 6 and 8, the inner wall of the scale 9 is also provided with inner wall grooves 93 engaged with the outer ribs 121, so that the scale 9 is rotated and moved axially by the rotation of the outer driving shaft 12, and the scale 9 is rotated away from the retaining wall 44 by the rotation of the outer driving shaft 12 during the dose setting process; the scale 9 is driven to rotate towards the stop wall 44 during the injection process, and when the end of the scale 9 rotates to abut against the stop wall 44 of the main body 4, the outer driving shaft 12 stops rotating, and the injection is completed.
As shown in fig. 1, the outer driving shaft 12 is fitted over the outer circumferential surface of the inner driving shaft 13 and drives the inner driving shaft 13, and a torsion spring 14 is provided between the inner driving shaft 13 and the outer driving shaft 12, the torsion spring 14 connecting the inner driving shaft 13 and the outer driving shaft 12, respectively. When the outer driving shaft 12 rotates, the torsion spring 14 transmits the torsion force to the inner driving shaft 13, the inner driving shaft 13 is connected with the plug part 16, and certain axial displacement occurs during the rotation process, so that the medicine in the medicine cartridge 1 can be discharged out of the medicine cartridge 1 through the injection needle 2, and the injection is completed. The end face of one side of the rewinding ring 7 facing the torsion spring 14 is provided with a counter bore 72, one end of the torsion spring 14 is fixed in the counter bore 72, and the rewinding ring 7 drives the torsion spring 14 to rotate and retract in the rotating process to complete the resetting of the connecting part.
As shown in fig. 1, the inner driving shaft 13 is provided with a plunger 15 connected with a plug 16 inside, the plunger 15 and the inner driving shaft 13 are connected with each other and have the same length, the outer part of the plunger 15 is provided with a thread, the inner wall of the inner driving shaft 13 is provided with a thread matched with the plunger 15, when the torsion spring 14 rotates the inner driving shaft 13, the axial movement of the plunger 15 is provided, and the plunger 15 drives the plug to move towards the injection needle 2 in the medicine cartridge 1, thereby completing the medicine delivery function.
As shown in fig. 4 and 9, in some embodiments of the present invention, two elongated slots 151 are respectively formed at the upper and lower ends of the plunger 15, two protrusions 73 are formed at one end of the rewinding ring 7 facing the plunger 15 and are matched with the elongated slots 151 in size, and the protrusions 73 are configured to enable the plunger 15 and the rewinding ring 7 to rotate together during rewinding, so that the plunger 15 retracts into the inner driving shaft 13 and the bung is withdrawn to the inlet of the cartridge 1. It will be appreciated that the two opposing slots 151 of the plunger 15 may be configured to have any mating shape that limits axial rotation but allows axial movement, and is not limited in any way. The ratchet teeth of the rewinding ring 7 have no deformable space, so that the idle stroke movement of the plunger 15 of the medicine cylinder 1 generated in the process of accumulating force again on the rewinding ring 7 can be prevented after the medicine cylinder 1 is loaded, the safe and reliable protection effect of the injection dose precision is ensured, and various pathological risks caused by insufficient injection dose of a user due to the defect of the injection dose formed by the idle stroke of the plunger 15 are prevented.
As shown in fig. 2 and 3, in some embodiments of the invention, a plurality of click ribs 47 are provided on the inner wall surface of the body 4, and an elastic contact piece 62 is provided on the outer wall surface of the trigger 6 to be engaged with the click ribs 47, so that the click rib collides with the elastic contact piece 62 to generate sound and tactile feedback in synchronization with the set dose when the dose is set. The dose setting and injection scale system provides sound and tactile feedback for a user in a dose setting step and a medicine injection step, prompts the user for the feedback on the magnitude speed of a setting unit in dose setting and injection, provides first feedback information for the user to grasp the injection process in time and terminate the injection at any time.
In some embodiments of the invention, the click feature may also be designed to provide a moving contact between circumferentially spaced ribs inside the clutch 11 and the outer ribs 121 of the outer drive shaft 12, giving an audible and tactile feedback synchronized with the set dose.
As shown in fig. 2 and 3, a trigger groove 48 is provided on the inner wall surface of the main body 4, and a finger portion 63 that engages with the trigger groove 48 is provided on an end surface of the trigger 6 facing the recoil ring 7. When the trigger 6 is rotated to adjust the amount of the medicine to be injected, the finger 63 is located outside the trigger groove 48 without being affected by the trigger groove 48; when the trigger 6 is depressed to inject, the fingers 63 enter the gauge setting slots, limiting the axial rotation of the trigger 6, preventing it from rotating, but backing out of the trigger slots 48 under the action of the biasing spring 10.
The working process of the invention is as follows: before injection, the medicine to be injected is put into the medicine cartridge 1, the medicine cartridge 1 is arranged on the rewinding ring 7, the trigger 6 is rotated, the clutch 11 and the scale 9 connected with the clutch 11 are driven to move towards the direction back to the medicine cartridge 1, and the outer driving shaft 12 cannot rotate along with the rotation; after reaching the preset calibration value, the trigger 6 is pressed towards the direction of the medicine cylinder 1, the trigger 6 releases the limitation of the outer driving shaft 12 through the pushing clutch 11, the outer driving shaft 12 starts to rotate, the inner driving shaft 13 and the scale 9 are driven to rotate, the plunger 15 moves towards the direction of the medicine cylinder 1, the plug part 16 is pushed to move in the medicine cylinder 1 and push the medicine to the direction of the injection needle 2, and finally the medicine is injected into a human body through the injection needle 2. After the injection is finished again, the bias spring 10 drives the scale 9, the clutch 11 and the trigger 6 to reset, and returns to the initial position where the injection is not performed, and at this time, the trigger 6 can be rotated again to calibrate the injection value of the next time.
In summary, the pen-type injection device provided by the embodiments of the present invention enables a pen-type administration injector to perform multiple injections scientifically and quantitatively, so as to meet the injection requirement of a customer that multiple injections can be performed with a single filling without dosage, reduce the times of filling drugs, and reduce the time cost of injection and the waste of human resources.
The above are only preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, many modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A pen injector, comprising:
a cartridge having an injection needle disposed at one end thereof;
a body arranged at an end of the cartridge facing away from the injection needle;
the drug delivery mechanism is arranged in the main body and comprises a plug part which is matched with the inner wall of the drug cylinder in size, and one end of the plug part extends into the drug cylinder;
the scale is arranged in the main body, the scale is spirally arranged and sleeved outside the connecting part, and the scale is matched with the main body to control the moving distance of the connecting part;
the trigger is arranged at one end, back to the medicine cartridge, of the main body and is connected with the scale and the connecting part;
the rewinding ring is sleeved on the outer side of the medicine cylinder and connected with the connecting part so as to drive the plug part to reset.
2. A pen injection device according to claim 1, wherein: the connecting portion comprises a clutch, an outer driving shaft and an inner driving shaft, the clutch is connected with the scale and the trigger, the clutch is sleeved on the outer side of the outer driving shaft, the outer driving shaft is sleeved on the outer peripheral surface of the inner driving shaft and can drive the inner driving shaft, and a plunger connected with the plug portion is arranged inside the inner driving shaft.
3. The pen injection device according to claim 2, wherein: and a torsion spring is arranged between the inner driving shaft and the outer driving shaft and is respectively connected with the inner driving shaft and the outer driving shaft.
4. The pen injection device according to claim 3, wherein: one end of the rewinding ring is connected with the torsion spring to compress the torsion spring and store the force of the torsion spring.
5. The pen injection device according to claim 2, wherein: one side of the outer wall surface of the clutch facing the rewinding ring is provided with first ratchet teeth, and the inner wall of the main body is provided with inner wall ribs matched with the first ratchet teeth.
6. The pen injection device according to claim 5, wherein: and one side of the outer wall surface of the clutch, which faces the trigger, is provided with second ratchet teeth, the direction of the second ratchet teeth is opposite to that of the first ratchet teeth, and one side of the trigger, which faces the clutch, is provided with rib grooves matched with the first ratchet teeth.
7. The pen injection device according to claim 2, wherein: an outer rib close to the trigger direction and a flat wall close to the medicine cartridge are arranged on the end face of the outer side of the outer driving shaft, an inner rib matched with the outer rib is arranged on the inner wall face of the clutch, and an inner wall groove matched with the outer rib is also arranged on the inner wall of the scale.
8. The pen injection device according to claim 1, wherein: the stopper wall of orientation scale is provided with in the week of main part, one side of scale is provided with the orientation end the butt face of barricade, dose set for accomplish the back end the barricade with distance between the butt face does the axial commentaries on classics stroke of scale.
9. The pen injection device according to claim 1, wherein: a biasing spring for resetting is arranged on one side end face, facing the main body, of the trigger, and a mounting plane for supporting the biasing spring is set on the inner wall face of the main body.
10. A pen injection device according to claim 1, wherein: the inner wall surface of the main body is provided with a spiral rib matched with the scale, and the outer side of the spiral rib of the main body is provided with an observation window for observing the reading of the scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210791386.7A CN115089810A (en) | 2022-07-06 | 2022-07-06 | Pen type injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210791386.7A CN115089810A (en) | 2022-07-06 | 2022-07-06 | Pen type injection device |
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| Publication Number | Publication Date |
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| CN115089810A true CN115089810A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210791386.7A Pending CN115089810A (en) | 2022-07-06 | 2022-07-06 | Pen type injection device |
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| Country | Link |
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| CN (1) | CN115089810A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104884107A (en) * | 2012-11-02 | 2015-09-02 | 欧文蒙福德有限公司 | Injection devices |
| CN107787237A (en) * | 2015-07-01 | 2018-03-09 | 诺和诺德股份有限公司 | Delivery device |
| CN107847688A (en) * | 2015-07-31 | 2018-03-27 | 诺和诺德股份有限公司 | Torque spring drives injection device |
-
2022
- 2022-07-06 CN CN202210791386.7A patent/CN115089810A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104884107A (en) * | 2012-11-02 | 2015-09-02 | 欧文蒙福德有限公司 | Injection devices |
| CN107787237A (en) * | 2015-07-01 | 2018-03-09 | 诺和诺德股份有限公司 | Delivery device |
| CN107847688A (en) * | 2015-07-31 | 2018-03-27 | 诺和诺德股份有限公司 | Torque spring drives injection device |
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Application publication date: 20220923 |
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| RJ01 | Rejection of invention patent application after publication |