CN113144341A - Multi-dose adjustable pre-filling injection pen - Google Patents
Multi-dose adjustable pre-filling injection pen Download PDFInfo
- Publication number
- CN113144341A CN113144341A CN202110411143.1A CN202110411143A CN113144341A CN 113144341 A CN113144341 A CN 113144341A CN 202110411143 A CN202110411143 A CN 202110411143A CN 113144341 A CN113144341 A CN 113144341A
- Authority
- CN
- China
- Prior art keywords
- dose
- injection
- hub
- push rod
- pen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims abstract description 172
- 239000007924 injection Substances 0.000 title claims abstract description 172
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 239000003814 drug Substances 0.000 claims description 31
- 230000005489 elastic deformation Effects 0.000 claims description 10
- 229940079593 drug Drugs 0.000 claims 9
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 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
-
- 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
- A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
-
- 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
- A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
- A61M5/31536—Blocking means to immobilize a selected dose, e.g. to administer equal doses
-
- 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
- A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
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 discloses a multi-dose adjustable pre-charging injection pen, which comprises a pen body, an injection push rod, a push rod sleeve, a clutch hub, an end limiting piece and a dose hub, wherein the injection push rod is in threaded connection with the pen body, the push rod sleeve is in sliding fit with the injection push rod along an injection direction and can transmit torque in the screwing direction of the injection push rod, the push rod sleeve is connected with the pen body through a first group of ratchet and pawl mechanisms, the clutch hub is in sliding fit with the push rod sleeve along the injection direction, the dose hub is in rotating connection with the pen body through threads, the clutch hub and the dose hub are limited to rotate through a clamping structure capable of being disengaged along the injection direction, the end limiting piece and the dose hub are supported through a supporting foot capable of being elastically deformed along the injection direction, and the dose hub can be rotated to push the clamping structure to be disengaged. The problems that the existing injection pen is inconvenient to operate and poor in dose adjusting effect can be effectively solved.
Description
Technical Field
The invention relates to the technical field of injection equipment, in particular to a multi-dose adjustable pre-filled injection pen.
Background
The existing injection pen has the defects of complex structure, more parts and more processing procedures, and low product reliability; parts are bonded in an adhesive mode in the processing process of part of products, so that biological risks exist; the product parts relate to a plurality of metal products, which causes the rise of the product cost and has poor use effect.
In summary, how to effectively solve the problems of inconvenient operation and poor dose adjustment effect of the current injection pen is a problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a multi-dose adjustable prefilled injection pen, which can effectively solve the problems of inconvenient operation and poor dose adjustment effect of the current injection pen.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-dose adjustable pre-filling injection pen comprises a pen body, an injection push rod, a push rod sleeve, a clutch hub, an end limiting part and a dose hub, wherein the injection push rod is in threaded connection with the pen body in an injection direction through an axis extending direction, the push rod sleeve is in sliding fit with the injection push rod in the injection direction and can transmit torque in the screwing direction of the injection push rod, the push rod sleeve is connected with the pen body through a first group of ratchet and pawl mechanisms to prevent the push rod sleeve from rotating around the injection push rod in the screwing direction relative to the pen body, the clutch hub is in sliding fit with the push rod sleeve in the injection direction and limits relative rotation, the dose hub is in threaded connection with the pen body and can be pushed to screw in the dose hub when the dose hub is axially driven, and the rotation of the clutch hub and the dose hub is limited through a clamping structure which can be disengaged in the injection direction, the utility model discloses a dose wheel hub, including dose wheel hub, tip locating part, joint structure, dose wheel hub, tip locating part and dose wheel hub, the tip locating part with through following injection direction elastic deformation's support foot portion supports, the tip locating part receives injection direction thrust is so that during support foot portion elastic deformation, can prevent the joint structure breaks away from the joint, and rotates before the support foot elastic deformation dose wheel hub can promote the joint structure breaks away from the joint.
When the multi-dose adjustable prefilled injection pen is used, the cassette bottle is fixed on the pen body, then the injection push rod is abutted against the rubber plug of the cassette bottle, and the dose hub is located at the initial position relative to the pen body. Then the end limiting part is pushed along the injection direction to enable the supporting foot part to be elastically deformed, and then the clamping structure is prevented from being separated from clamping. The tip locating part will inject direction thrust transmission to dose wheel hub this moment, and dose wheel hub can precession, because joint structure joint this moment, so dose wheel hub can drive clutch wheel hub and rotate to drive the push rod sleeve in proper order and rotate, the injection push rod rotates, in order to inject. After the first injection is finished, the end limiting part is loosened, and the end limiting part resets. At this point the dose hub returns to its original position to facilitate dose readjustment for the next injection. When the dose is readjusted and increased, the dose hub can be operated to unscrew relative to the pen body, and in the unscrewing process, the dose hub cannot drive the clutch hub to rotate but drives the clutch hub to slide along the reverse direction of the injection direction because the limit of the end limiting piece is not provided, and at the moment, the injection push rod and the push rod sleeve are not moved relative to the pen body. When the dose needs to be adjusted and reduced, the dose hub needs to be operated to rotate, and the clutch hub cannot rotate because the end limiting piece is not subjected to the acting force in the injection direction. In this adjustable preliminary filling of multi-dose injection pen, the tip locating part has been set up, through elastic supporting foot portion, whether rotation between control dose wheel hub and the clutch wheel hub is connected, and then make when injecting, directly press the tip locating part and can accomplish the injection, and when rotating the adjustment dose, only need rotate dose wheel hub alone can, make the operation very convenient simple, and dose control easy operation, and overall structure is very simple, the part is few, the equipment is convenient, and need not to use structures such as metal spring, make overall cost lower. In conclusion, the multi-dose adjustable prefilled injection pen can effectively solve the problems that the existing injection pen is inconvenient to operate and poor in dose adjusting effect.
Preferably, the syringe further comprises a dose limiting nut which is in threaded connection with the clutch hub and is in sliding engagement with the dose hub in the injection direction and limits relative rotation to move axially of the clutch hub when the dose hub rotates relative to the clutch hub.
Preferably the tip of the support foot is a pawl and the end of the dose hub has a ratchet cooperating with the pawl on the support foot to prevent relative rotation in the precession direction; the end limiting part is provided with a limiting flange, and the dosage hub is correspondingly provided with a limiting groove which surrounds the limiting flange so as to limit the moving range of the limiting flange in the injection direction.
Preferably, the rear end of the clutch hub is provided with a convex disc, the front side of the convex disc is provided with a plurality of arc-shaped bulges which are uniformly distributed in the circumferential direction, the rear end of the dosage hub is internally provided with an annular shoulder, and the rear side of the annular shoulder is provided with arc-shaped tooth grooves which are distributed in the circumferential direction and matched with the arc-shaped bulges; the rear end of the clutch hub is connected with the end limiting piece through a second group of ratchet and pawl mechanisms.
Preferably, still include the tip button, establish card around the tip button on the tip locating part, and the middle part has the biography power cylinder that extends along the injection direction, the front end that passes power the cylinder with the tip locating part offsets and be the spherical type.
Preferably, the pen body comprises a barrel and a push rod nut clamped into the barrel, the push rod nut is in threaded connection with the injection push rod, and the push rod sleeve is connected with the first group of ratchet and pawl mechanisms.
Preferably, the injection push rod, the push rod sleeve, the clutch hub, the dose limiting nut, the dose hub and the barrel are sequentially sleeved with each other.
Preferably, the pen body is provided with a window, and the outer side of the dosage hub is provided with a graduated scale which is spirally distributed so as to pass through the window in sequence during screwing.
Preferably, still including the joint be in the medicine bottle frame of body section of thick bamboo front end, medicine bottle frame rear end has the medicine bottle ring, medicine bottle ring front end be used for with medicine bottle counterbalance in the medicine bottle frame, the rear end with the body of a pen counterbalance, the front end of injection push rod has the rotatable push rod knob that offsets with the medicine bottle plug, medicine bottle frame front end has the screw thread post that is used for connecting the syringe needle.
Preferably, the medicine bottle rack further comprises a pen cap, and the rear end of the pen cap is clamped with the medicine bottle rack.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a multi-dose adjustable pre-filled injection pen according to an embodiment of the present invention;
fig. 2 is an exploded view of a multi-dose adjustable prefilled injection pen according to an embodiment of the present invention;
FIG. 3 is a schematic external view of the multi-dose adjustable prefilled injection pen according to the embodiment of the present invention after the pen cap is removed;
FIG. 4 is a schematic diagram illustrating a rotation-out structure of a dose hub of a multi-dose adjustable pre-filled injection pen according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view illustrating a dose hub of a multi-dose adjustable prefilled injection pen according to an embodiment of the present invention being rotated out;
FIG. 6 is a schematic structural diagram of a push rod nut according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a dose limiting nut provided in an embodiment of the present invention;
FIG. 8 is a schematic structural view of a clutch hub provided in accordance with an embodiment of the present invention;
FIG. 9 is a schematic structural view of a push rod sleeve provided in accordance with an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an end limiting element according to an embodiment of the present invention;
FIG. 11 is a schematic structural view of a vial holder according to an embodiment of the present invention;
FIG. 12 is a schematic view of a dose hub according to an embodiment of the present invention;
fig. 13 is a schematic view of the internal structure of the barrel opening according to the embodiment of the present invention;
FIG. 14 is a schematic diagram of a rear end structure of a multi-dose adjustable prefilled injection pen provided in an embodiment of the present invention;
fig. 15 is a schematic diagram of a rear-end explosion structure of a multi-dose adjustable prefilled injection pen provided in an embodiment of the present invention;
FIG. 16 is a schematic diagram illustrating a cross-sectional rear end view of a multi-dose adjustable pre-filled injection pen according to an embodiment of the present invention;
FIG. 17 is a schematic view of the mounting between the clutch hub and the dose hub provided by an embodiment of the present invention;
FIG. 18 is a sectional view of the rear end of the multi-dose adjustable prefilled injection pen according to the embodiment of the present invention;
fig. 19 is a schematic view of a mounting structure between a dose limiting nut and a dose hub according to an embodiment of the present invention.
The drawings are numbered as follows:
a needle 1, a cartridge 2, a rubber plug 3, a pusher nut 4, a dose limiting nut 5, a clutch hub 6, a pusher sleeve 7, an end stop 8, a cap 9, a vial holder 10, a pusher knob 11, a vial ring 12, an injection pusher 13, a dose hub 14, a barrel 15, an injection button 16, a threaded hole 41, a limiting ratchet 42, a third groove 43, a second groove 51, a limiting internal thread 52, a first protrusion 61, an arc-shaped protrusion 62, a driving pawl 63, a limiting external thread 64, a flattened surface 71, a limiting pawl 72, a first groove 73, a catch 74, an annular external catch 81, a limiting flange 82, a supporting foot 83, a driving ratchet 84, a notch 101, an installation protrusion 102, a limiting connection structure 103, a threaded post 104, a support 141, an arc-shaped ratchet 142, a ratchet zero point indicator 143, a spline tooth space 144, an adjusting external thread 145, a limiting groove 146, a second protrusion 147, a radial spline 147, a limiting groove 146, a second protrusion, Adjusting internal threads 151, a window 152, a reading mark 153, a third protrusion 154, a limiting protrusion 155, an annular mounting groove 156, a force transmission cylinder 161 and an annular inner clamping protrusion 162.
Detailed Description
The embodiment of the invention discloses a multi-dose adjustable pre-filling injection pen, which effectively solves the problems of inconvenient operation and poor dose adjusting effect of the existing injection pen.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-19, fig. 1 is a schematic cross-sectional view illustrating a multi-dose adjustable prefilled injection pen according to an embodiment of the present invention; fig. 2 is an exploded view of a multi-dose adjustable prefilled injection pen according to an embodiment of the present invention; FIG. 3 is a schematic external view of the multi-dose adjustable prefilled injection pen according to the embodiment of the present invention after the pen cap is removed; FIG. 4 is a schematic diagram illustrating a rotation-out structure of a dose hub of a multi-dose adjustable pre-filled injection pen according to an embodiment of the present invention; FIG. 5 is a schematic cross-sectional view illustrating a dose hub of a multi-dose adjustable prefilled injection pen according to an embodiment of the present invention being rotated out; FIG. 6 is a schematic structural diagram of a push rod nut according to an embodiment of the present invention; FIG. 7 is a schematic structural view of a dose limiting nut provided in an embodiment of the present invention; FIG. 8 is a schematic structural view of a clutch hub provided in accordance with an embodiment of the present invention; FIG. 9 is a schematic structural view of a push rod sleeve provided in accordance with an embodiment of the present invention; FIG. 10 is a schematic view of a vial rack according to an embodiment of the present invention; FIG. 11 is a schematic structural view of a vial holder according to an embodiment of the present invention; FIG. 12 is a schematic view of a dose hub according to an embodiment of the present invention; fig. 13 is a schematic view of the internal structure of the barrel opening according to the embodiment of the present invention; FIG. 14 is a schematic diagram of a rear end structure of a multi-dose adjustable prefilled injection pen provided in an embodiment of the present invention; fig. 15 is a schematic diagram of a rear-end explosion structure of a multi-dose adjustable prefilled injection pen provided in an embodiment of the present invention; FIG. 16 is a schematic diagram illustrating a cross-sectional rear end view of a multi-dose adjustable pre-filled injection pen according to an embodiment of the present invention; FIG. 17 is a schematic view of the mounting between the clutch hub and the dose hub provided by an embodiment of the present invention; FIG. 18 is a sectional view of the rear end of the multi-dose adjustable prefilled injection pen according to the embodiment of the present invention; fig. 19 is a schematic view of a mounting structure between a dose limiting nut and a dose hub according to an embodiment of the present invention.
In one embodiment, the present embodiment provides a multi-dose adjustable pre-filled injection pen, as shown in fig. 1-3, which mainly comprises a pen body, an injection push rod 13, a push rod sleeve 7, a clutch hub 6, an end limit member 8 and a dose hub 14, and of course, a medicine bottle holder 10 for placing the cassette bottle 2, a pen cap 9 sleeved on the pen body, etc. may be further provided.
The injection push rod 13 and the pen body are connected through a thread with the axis extending direction as the injection direction, so that when the injection push rod 13 rotates along the screwing direction, the injection push rod 13 moves axially and separately relative to the pen body, and because the cassette bottle 2 and the pen body are relatively fixed, the cassette bottle 2 and the pen body are generally relatively fixed through the medicine bottle rack 10, and certainly, the cassette bottle and the pen body can be relatively fixed in connection modes such as clamping connection, thread connection and the like. The injection push rod 13 can push the rubber plug 3 inside the cartridge 2 to move along the injection direction, i.e. to form an injection.
Wherein the push rod sleeve 7 is in sliding fit with the injection push rod 13 in the injection direction and is capable of transferring a torque in the injection push rod precession direction. Specifically, if the injection push rod 13 is provided with an external thread, one side or two opposite sides of the injection push rod 13 can be flattened, the push rod sleeve 7 is sleeved outside the injection push rod 13, and the cross section of the push rod sleeve is correspondingly arranged, i.e. the flattened surface 71 is correspondingly arranged, i.e. the flat shape is formed, so as to limit the rotation of the internal injection push rod 13, but the injection push rod 13 can slide in the push rod sleeve 7 along the injection direction, so as to realize sliding connection. Of course, an axially extending groove may be provided on the injection plunger 13, and a rib is correspondingly provided inside the plunger sleeve 7 to limit the relative rotation between the plunger sleeve 7 and the injection plunger 13 through the rib groove.
The push rod sleeve 7 is connected with the pen body through a first group of ratchet and pawl mechanisms to prevent the push rod sleeve 7 from rotating around the injection push rod 13 in the rotating and withdrawing direction relative to the pen body, and the clutch hub 6 and the push rod sleeve 7 are in sliding fit in the injection direction and limit relative rotation. Because the relative rotation between the push rod sleeve 7 and the injection push rod 13 is limited, the injection push rod 13 can be prevented from rotating in the screwing and unscrewing direction, so that the push rod sleeve 7, the injection push rod 13 and the clutch hub 6 can only rotate around the injection push rod 13 in the screwing and unscrewing direction, and the injection push rod 13 performs injection. When the injection push rod 13 is screwed close, the push rod sleeve 7 rotates along with the injection push rod, but the injection push rod 13 is fixed relative to the pen body in the injection direction, and the injection push rod 13 slides relative to the push rod sleeve 7 in the injection direction. Wherein clutch hub 6 follows with push rod sleeve 7 injection direction sliding fit and restriction rotate relatively, and is concrete, can make clutch hub 6 cover establish in the push rod sleeve 7 outside, and in push rod sleeve 7 lateral surface and clutch hub 6's medial surface, one is provided with the sand grip that extends along the injection direction, another is provided with the recess with sand grip matched with to the restriction rotates relatively, and is concrete, and push rod sleeve 7 both sides are provided with first recess 73 respectively, and clutch hub 6 inside relative both sides all correspond and are provided with first sand grip 61.
Wherein dose wheel hub 14 and body of a pen pass through threaded rotation connection and can promote dose wheel hub 14 precession when axial drive dose wheel hub 14, preferentially through non-auto-lock threaded connection between dose wheel hub 14 and the body of a pen promptly, and in order to guarantee to rotate more smoothly, should reduce the sliding friction power of the threaded connection department between dose wheel hub 14 and the body of a pen as far as possible, can increase lubricating oil between the two. Of course, it is also possible to provide other structures instead of the non-self-locking thread, so that the axial thrust can be converted into a part of the torque thrust to push the dose hub 14 to rotate relative to the pen body. In particular, it is possible to provide the dose hub 14 with an external adjustment thread 145 on the outside and an internal adjustment thread 151 on the inside of the body.
Wherein, the clutch hub 6 and the dose hub 14 are limited to rotate by a clamping structure which can be separated along the injection direction, and the dose hub 14 can provide a supporting force in the opposite direction of the injection direction for the clutch hub 6 under the clamping state of the clamping structure. That is, the clutch hub 6 can move along the injection direction, so that the engagement structure is in the engagement state, and the clutch hub 6 can be driven to rotate by limiting the relative rotation between the clutch hub 6 and the engagement structure, that is, the dose hub 14 rotates without being separated from the engagement state, and the clutch hub 6 and the engagement structure can freely rotate relative to each other when being separated from the engagement state.
Wherein, support through the support foot portion 83 that can follow injection direction elastic deformation between tip locating part 8 and the dose wheel hub 14 to make tip locating part 8 receive injection direction thrust so that when supporting foot portion 83 elastic deformation, can prevent the joint structure from breaking away from the joint, and rotate dose wheel hub 14 before supporting foot portion 83 elastic deformation and can promote the joint structure and break away from the joint, even the joint structure is in the joint state this moment, under the restriction that does not receive tip locating part 83, only rotate dose wheel hub 14, can force the joint structure to break away from the joint, with unable transmission moment of torsion, and then unable propelling clutch wheel hub 6 synchronous revolution.
In the multi-dose adjustable prefilled injection pen, when in use, the cassette bottle 2 is fixed on the pen body, then the injection push rod 13 is abutted against the rubber plug 3 of the cassette bottle 2, and the dose hub 14 is positioned at the initial position relative to the pen body. The end stop 8 is then pushed in the injection direction to elastically deform the support foot 83 and then to prevent the catch formation from disengaging. At this moment, the end limiting part 8 transmits the injection direction thrust to the dose hub 14, the dose hub 14 can be screwed in, and the clamping structure is clamped at the moment, so the dose hub 14 can drive the clutch hub 6 to rotate so as to drive the push rod sleeve 7 to rotate in sequence, and the injection push rod 13 rotates so as to inject. After the first injection is completed, the end limiting part 8 is loosened, and the end limiting part 8 is reset. At this point it is necessary to return the dose hub 14 to the initial position to facilitate the metering of the next injection. The dose hub 14 can be operated to rotate out relative to the pen body, and during the rotation process, because there is no limitation of the end stop 8, the dose hub 14 cannot drive the clutch hub 6 to rotate, but drive the clutch hub 6 to slide in the reverse direction of the injection direction, and at this time, the injection push rod 13 and the push rod sleeve 7 are not moved relative to the pen body until the dose hub 14 returns to the initial position relative to the pen body, and the injection operation can be performed again. On the other hand, if the dose is rotated excessively, the dose boss 14 needs to be operated to be screwed in, and the end stopper 8 does not receive an urging force in the injection direction, so that the clutch boss 6 does not rotate. In this adjustable preliminary filling of multi-dose injection pen, end locating part 8 has been set up, through elastic support foot 83, whether rotation between control dose wheel hub 14 and clutch wheel hub 6 is connected, and then make when injecting, directly press the end locating part and can accomplish the injection, and when rotating the regulation dose, only need rotate dose wheel hub 14 alone can, make the operation very convenient simple, and dose regulation easy operation, and overall structure is very simple, the part is few, the equipment is convenient, and need not to use structures such as metal spring, make overall cost lower. In conclusion, the multi-dose adjustable prefilled injection pen can effectively solve the problems that the existing injection pen is inconvenient to operate and poor in dose adjusting effect.
Further, in order to avoid excessive rotation of the dose drum 14 beyond the contained dose, it is preferred that the dose limiting nut 5 is further included, and in particular, the dose limiting nut 5 is threadedly connected to the clutch hub 6 and is slidably engaged with the dose hub 14 in the injection direction and limits relative rotation, so as to move in the axial direction of the clutch hub 6 when the dose hub 14 rotates relative to the clutch hub 6, i.e., in the injection direction, and when the rotation angle of the dose hub 14 relative to the clutch hub 6 reaches a predetermined value, the dose hub 14 cannot continue relative rotation with respect to the clutch hub 6, and thus the dose hub 14 cannot continue rotation with respect to the clutch hub 6. In particular, the dose limiting nut 5 may comprise a limiting internal thread 52 and a second groove 51, the dose limiting nut is provided with the second grooves 51 extending along the injection direction on two sides, and the dose hub 14 is correspondingly provided with the second ribs 147 on two opposite sides inside, so as to limit the relative rotation between the dose hub 14 and the dose limiting nut 5 through the second grooves 51 and the second ribs 147. Correspondingly, the clutch hub 6 has a limiting external thread 64 on its outer side for co-operation with the limiting internal thread 52, in particular, the thread pitch between the dose limiting nut 5 and the clutch hub 6 may be smaller than the thread pitch between the dose hub 14 and the pen body, and the former may be a self-locking thread.
Further, in order to avoid that the end stop 8 rotates relative to the dose hub 14 during injection, the tip of the supporting foot 83 is preferably a pawl, the tip of the pawl faces the injection direction, the supporting foot 83 is rod-shaped, one end of the supporting foot has a downwardly extending and protruding pawl as a supporting point, and the other end of the supporting foot is connected to the body of the end stop 8, so that the supporting foot 83 can be elastically bent, thereby changing the relative distance between the pawl and the body of the end stop 8 in the injection direction.
The end of the dose hub 14 has a supporting ratchet 141 that cooperates with a pawl on the supporting foot 83 to prevent relative rotation in the screwing direction of the ratchet hub 14, thereby driving the end stop 8 to rotate synchronously during screwing, and providing a supporting force to the end stop 8 in the opposite direction to the injection direction, i.e. in the backward direction.
Further, in order to avoid the end stop 8 from shaking freely, especially in the injection direction. In this connection, the end stop 8 preferably has a stop flange 82, the dose hub 14 is correspondingly provided with a stop recess 146 surrounding the stop flange 82 to limit the range of movement of said stop flange 82 in the injection direction and thus of the end stop 8 relative to the dose hub 14 in the injection direction, and the support foot 83 on the end stop 8 is preferably in a pre-tensioned state.
Further, in order to set up the joint structure for convenience, it is concrete, can make clutch hub 6 rear end have the flange, the flange front side has the protruding 62 of a plurality of circumference evenly distributed's arc, and it is corresponding, dose hub 14 rear end inside has annular shoulder, annular shoulder rear side have circumference distribute and with protruding 62 matched with arc tooth's socket 142 of arc, it is concrete, arc is protruding 62 can be the semicircle column type, and the axis direction, for clutch hub 6's radial direction, the transversal semicircular in shape of corresponding arc tooth's socket 142, and the tooth point rounding off is excessive to when conveniently rotating dose hub 14, clutch hub 6 is beated in the injection direction, so that the joint structure makes things convenient for the joint business turn over state, in order to avoid transmitting the moment of torsion.
Further, the rear end of the clutch hub 6 and the end stop 8 may be connected by a second set of ratchet-pawl mechanism, that is, the rear end of the clutch hub 6 has the transmission pawls 63 disposed oppositely, and the end stop 8 has the transmission ratchet 84 inside. So that, at the time of injection, the dose boss 14 can transmit torque to the end stop 8, while the end stop 8 can transmit torque to the clutch boss 6. During dose setting, the drive pawl 63 is disengaged from the drive ratchet 84 due to the support foot 83.
Further, in order to apply a pushing force to the end-limiting member 8 in the injection direction during injection, it is preferable that the end-limiting member further includes an end button 16, wherein the end button 16 is engaged with the end-limiting member 8 to prevent the end torque 16 from disengaging from the end-limiting member 8, specifically, the end-limiting member 8 has an annular outer engaging protrusion 81 extending annularly, and the end button is correspondingly provided with an annular inner engaging protrusion 162 protruding inwardly, wherein a front side of the annular outer engaging protrusion 81 abuts against a rear side of the annular inner engaging protrusion 162. And preferably the middle of the end button 16 has a force transfer cylinder 161 extending in the injection direction, wherein the front end of the force transfer cylinder 161 abuts against the end stop 8 and is spherical in shape to reduce the rotational resistance.
Specifically, can make tip button 6 be the hood type, and the brim of a hat inner wall has protruding 162 of annular inside callipers, inboard middle part has biography power cylinder 161, and tip button 6 covers establishes on the rear end cylinder of tip locating part 8, and the cylinder rear end outside has protruding 81 of annular outside callipers, passes power cylinder 161 front end sphere portion top at the inner bottom middle part inslot of rear end cylinder.
Further, for the convenience of setting the pen body, it is preferable that the pen body includes a barrel 15 and a push rod nut 4 clipped into the barrel 15, the push rod nut 4 is connected with the injection push rod 13 by screw thread, and the push rod sleeve 7 is connected by the first set of ratchet and pawl mechanism, specifically, the barrel 15 has an opening at the front end and a limit shoulder inside, wherein the push rod nut 4 is loaded into the barrel 15 from the opening at the front end until the limit shoulder abuts against, and the barrel 15 has a limit protrusion 155 inside to prevent the push rod nut 4 from separating from the barrel 15, and when loaded, the limit protrusion 155 is passed through by elastic deformation. Specifically, the push rod nut 4 may have a threaded hole 41 penetrating through the front and rear portions thereof, the rear portion thereof is provided with a large groove body, the groove wall of the large groove body is a limiting ratchet 42 of the first ratchet and pawl mechanism, the front end of the corresponding push rod sleeve 7 is provided with a limiting pawl 72 of the first ratchet and pawl mechanism, the outer portions of both sides of the large groove body are provided with third grooves 43 extending in the injection direction, and the barrel 15 is provided with third protrusions 154 matching with the third grooves 43.
Specifically, the injection plunger 13, the plunger sleeve 7, the clutch hub 6, the dose limiting nut 5, the dose hub 14 and the barrel 15 may be sequentially sleeved with each other. In order to avoid excessive axial displacement of clutch hub 6, push rod sleeve 7 preferably has a catch 74 at its rear end.
Further, to facilitate reading of the dose, it is preferred here that the barrel 15 is provided with a window 152, and that said dose hub 14 is provided on the outside with a helically distributed scale to be able to pass through said window 152 in sequence during screwing, and for more accurate reading it is preferred here that the barrel 15 is provided with a reading mark 153, preferably in the form of an arrow. Correspondingly, the dose hub 14 may be provided with a zero point marking 143 corresponding to the zero point of the scale, such that when the reading is zero, the zero point marking 143 is aligned with the reading marking 153. Wherein, for convenience of rotation, the rear end of the dosing hub 14 preferably has radial splines 144 exposed from the barrel 15 for anti-slip purposes.
Further, in order to fix the cartridge bottle conveniently, the cartridge bottle holder 10 is preferably further included here, and the cartridge bottle holder is fastened to the front end of the barrel, and the rear end of the specific cartridge bottle holder 10 is inserted into the opening in the front end of the barrel 15, and has a notch 101 at the rear end to position the angular position relationship between the barrels 15, and has an annular mounting protrusion 102 to match with the annular mounting groove 156 in the opening of the barrel 15 to position the cartridge bottle in the injection direction. Wherein the rear end of the medicine bottle rack 10 is provided with a medicine bottle ring 12, the front end of the medicine bottle ring 12 is used for abutting against the medicine bottle in the medicine bottle rack 10, the rear end of the medicine bottle ring 12 abuts against the pen body, the front end of the injection push rod 13 is provided with a push rod knob 11 which can rotate to abut against a medicine bottle rubber plug, and the front end of the medicine bottle rack 10 is provided with a threaded column 104 for connecting a needle head 1. Correspondingly, still be provided with pen cap 9, pen cap 9 rear end and medicine bottle rack 10 joint, the relative both sides of medicine bottle rack 10 have spacing connection structure 103 promptly, and the port has spacing connection structure along the inboard behind the corresponding pen body.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides an adjustable preliminary filling of multi-dose injection pen, its characterized in that, includes a body, injection push rod, push rod sleeve, clutch hub, tip locating part and dose wheel hub, the injection push rod with the body passes through the axis extending direction and is the threaded connection of injection direction, push rod sleeve with the injection push rod is along injecting direction sliding fit and can transmitting the moment of torsion of injection push rod precession direction, push rod sleeve with connect in order to prevent through first group ratchet pawl mechanism between the body push rod sleeve is relative the body winds injection push rod revolves and moves back the direction and rotate, clutch hub with push rod sleeve is along injecting direction sliding fit and restriction relative rotation, dose wheel hub with the body passes through threaded rotary connection and axial drive dose wheel hub can promote during can the precession of dose wheel hub, clutch hub with between the dose wheel hub through the joint structure limit of can breaking away from along the injection direction The system rotates, the tip locating part with through following between the dose wheel hub injection direction elastic deformation's support foot portion supports, the tip locating part receives injection direction thrust is so that during support foot portion elastic deformation, can prevent the joint structure breaks away from the joint, and is in rotate before the support foot elastic deformation dose wheel hub can promote the joint structure breaks away from the joint.
2. A multi-dose adjustable pre-filled injection pen according to claim 1, further comprising a dose limiting nut threadedly connected with the clutch hub and slidably engaging the dose hub in the injection direction and limiting relative rotation to move axially of the clutch hub when the dose hub rotates relative to the clutch hub.
3. A multi-dose adjustable pre-filled injection pen according to claim 2, wherein the tip of the support foot is a pawl and the dose hub end has a ratchet cooperating with the pawl on the support foot to prevent relative rotation in the precession direction; the end limiting part is provided with a limiting flange, and the dosage hub is correspondingly provided with a limiting groove which surrounds the limiting flange so as to limit the moving range of the limiting flange in the injection direction.
4. A multi-dose adjustable pre-filled injection pen according to claim 3, wherein the clutch hub has a cam at its rear end, the front side of the cam having a plurality of circumferentially evenly distributed arcuate projections, the dose hub having an annular shoulder inside its rear end, the rear side of the annular shoulder having circumferentially distributed arcuate splines cooperating with the arcuate projections; the rear end of the clutch hub is connected with the end limiting piece through a second group of ratchet and pawl mechanisms.
5. A multi-dose adjustable pre-filled injection pen according to claim 4, further comprising an end button, wherein the end button is engaged with the end stop member at the periphery thereof, and the middle portion thereof has a force-transmitting cylinder extending in the injection direction, and the front end of the force-transmitting cylinder abuts against the end stop member and is spherical.
6. A multi-dose adjustable pre-filled injection pen according to claim 5, wherein the pen body comprises a barrel and a pusher nut snapped into the barrel, the pusher nut being in threaded connection with the injection pusher and in connection with the pusher sleeve via the first set of ratchet and pawl mechanisms.
7. A multi-dose adjustable pre-filled injection pen according to claim 6, wherein the injection plunger, the plunger sleeve, the clutch hub, the dose limiting nut, the dose hub and the barrel are provided nested one within the other.
8. A multi-dose adjustable pre-filled injection pen according to claim 7, wherein the pen body has a window and the dose hub has a helically distributed scale on the outside to pass through the window in sequence when screwed in.
9. A multi-dose adjustable pre-filled injection pen as claimed in claim 8, further comprising a drug bottle holder fastened to the front end of the barrel, wherein the drug bottle holder has a drug bottle ring at the rear end, the front end of the drug bottle ring is adapted to abut against a drug bottle in the drug bottle holder, the rear end of the drug bottle ring abuts against the pen body, the injection push rod has a push rod knob at the front end thereof adapted to rotate to abut against a drug bottle rubber plug, and the drug bottle holder has a threaded post at the front end thereof adapted to be connected to a needle.
10. A multi-dose adjustable pre-filled injection pen according to claim 9, further comprising a pen cap, the rear end of which is snap-fitted to the vial holder.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110411143.1A CN113144341A (en) | 2021-04-16 | 2021-04-16 | Multi-dose adjustable pre-filling injection pen |
| US18/271,435 US20240058544A1 (en) | 2021-04-16 | 2021-10-19 | Multi-dose adjustable pre-charge injection pen |
| EP21936742.2A EP4324500A1 (en) | 2021-04-16 | 2021-10-19 | Multi-dose adjustable pre-charge injection pen |
| BR112023015609A BR112023015609A2 (en) | 2021-04-16 | 2021-10-19 | MULTIPLE DOSE ADJUSTABLE PRELOAD INJECTION PEN |
| PCT/CN2021/124591 WO2022217875A1 (en) | 2021-04-16 | 2021-10-19 | Multi-dose adjustable pre-charge injection pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110411143.1A CN113144341A (en) | 2021-04-16 | 2021-04-16 | Multi-dose adjustable pre-filling injection pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113144341A true CN113144341A (en) | 2021-07-23 |
Family
ID=76868656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110411143.1A Pending CN113144341A (en) | 2021-04-16 | 2021-04-16 | Multi-dose adjustable pre-filling injection pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113144341A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022217875A1 (en) * | 2021-04-16 | 2022-10-20 | 山东威高普瑞医药包装有限公司 | Multi-dose adjustable pre-charge injection pen |
| CN115282404A (en) * | 2022-08-16 | 2022-11-04 | 山东威高普瑞医药包装有限公司 | Medical injection pen with adjustable dosage |
| CN117563084A (en) * | 2024-01-16 | 2024-02-20 | 苏州嘉树医疗科技有限公司 | Injection pen and dose adjusting mechanism thereof |
-
2021
- 2021-04-16 CN CN202110411143.1A patent/CN113144341A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022217875A1 (en) * | 2021-04-16 | 2022-10-20 | 山东威高普瑞医药包装有限公司 | Multi-dose adjustable pre-charge injection pen |
| CN115282404A (en) * | 2022-08-16 | 2022-11-04 | 山东威高普瑞医药包装有限公司 | Medical injection pen with adjustable dosage |
| CN115282404B (en) * | 2022-08-16 | 2023-04-07 | 山东威高普瑞医药包装有限公司 | Medical injection pen with adjustable dosage |
| CN117563084A (en) * | 2024-01-16 | 2024-02-20 | 苏州嘉树医疗科技有限公司 | Injection pen and dose adjusting mechanism thereof |
| CN117563084B (en) * | 2024-01-16 | 2024-03-15 | 苏州嘉树医疗科技有限公司 | Injection pen and dose adjusting mechanism thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113144341A (en) | Multi-dose adjustable pre-filling injection pen | |
| US8864721B2 (en) | Gearing mechanism for a dose delivery device | |
| CN106132460B (en) | Stop the fluid conveying pen with improved dosage setting feature with final dose | |
| GB2109690A (en) | Dose metering plunger devices for use with syringes | |
| RU2019121000A (en) | DATA COLLECTION DEVICE ATTACHED TO INJECTION DEVICE | |
| JP2004503303A (en) | Injection device with gearbox | |
| JPS63501271A (en) | injection device | |
| JP6316945B2 (en) | Drug delivery device having piston rod coupler | |
| RU2017115666A (en) | DRUG DELIVERY DEVICE | |
| AU2005324262B2 (en) | Dosing mechanism for an injection device with gearing | |
| JP2016518231A (en) | Forward-loading drug delivery device with dynamic axial stop feature | |
| CN215083461U (en) | Multi-dose adjustable pre-filling injection pen | |
| WO2022217875A1 (en) | Multi-dose adjustable pre-charge injection pen | |
| US20080262437A1 (en) | Dose setting mechanism with overstrain lock | |
| WO2010106031A1 (en) | Injection device | |
| US20180085536A1 (en) | Locking Device for a Syringe | |
| CA3115395C (en) | Fixed dose injector pens | |
| US20150283326A1 (en) | Injection device with a coupling | |
| CA3111681C (en) | Injection device | |
| CN210904435U (en) | Unidirectional rotating mechanism and syringe with same | |
| CN207708284U (en) | A kind of reusable pen-type injector | |
| JP2018534022A (en) | Piston washer assembly, method of assembly, and drug delivery device incorporating such a piston washer assembly | |
| CN117563085B (en) | Injection pen and dose adjusting mechanism thereof | |
| CN213609007U (en) | Injection device for double-cavity clamping type bottle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |