Summary of the invention
The purpose of the present invention is to provide a kind of injection pens, to solve the liquid medicine existing in the prior art when in liquid medicine pipeAfter injection, entire injection pen just cannot be re-used, and cannot replace liquid medicine pipe, this not only wastes resource, but also increasesThe purchase cost of user, the technical issues of increasing the burden of user.
The present invention provides a kind of injection pens, including dosage adjustment portion and medicine storehouse portion；Medicine storehouse portion is for storing prepackageThere is the flask for medicinal preparations of medicament；The dosage adjustment portion is used to adjust drug dose when injection, and makes the flask for medicinal preparations discharge settingThe medicament of dosage；
Medicine storehouse portion includes medicine storehouse shell and the first clutch, and first clutch includes clutch base, instituteThe one end for stating clutch base and medicine storehouse shell is detachably connected；
The dosage adjustment portion includes pen tube, dial drum, check sleeve, return barrel and reverse-flighted screw；The pen tubeOne end is detachably connected with the clutch base；
The dial drum is threaded through in the pen tube, and the dial drum is threadedly coupled with the pen tube；
The check sleeve is threaded through in the dial drum, and the upper end of the inner wall of the dial drum and the check sleeveBetween be provided with the second clutch, for enabling the dial drum band when the dial drum is screwed out from the pen tubeMove the check sleeve make rotating motion and far from medicine storehouse shell axial movement；
It is provided with the first detent mechanism between the inner wall of the dial drum and the outer wall of the check sleeve, it is described for makingCheck sleeve does unidirectional rotary motion；
The return barrel is threaded through in the check sleeve, and the upper end of the return barrel and the check sleeveUpper end is connected together；
It is provided with third clutch between the lower end of the check sleeve and the lower end of the return barrel, for working as instituteWhen stating the dial drum screw-in pen tube, the check sleeve and the return barrel is made to do the axial fortune close to medicine storehouse shellIt is dynamic；
The reverse-flighted screw is threaded through in the return barrel, and the reverse-flighted screw includes upper semisection and lower semisection, describedUpper semisection is threadedly coupled with the return barrel.
Further, first clutch further includes feed gear wheel and clutch gear；The feed gear wheel and describedClutch gear is fastened in the clutch base, and the feed gear wheel can be meshed with the clutch gear；It is described fromClosing gear can be along the axial movement of the clutch base；The feed gear wheel is set on the lower semisection, and the feedingGear is threadedly coupled with the lower semisection.
Further, the upper semisection have the first screw thread, the lower semisection have the second screw thread, first screw thread withThe thread rotary orientation of second screw thread is opposite.
Further, second clutch includes multiple first be arranged on the inner wall of the upper end of the dial drumIndex tooth, and be arranged in the check sleeve upper end it is multiple second indexing teeth, it is described first indexing tooth be used for it is describedSecond indexing tooth is meshed.
Further, the upper end of the check sleeve is provided with clutch knob, when the pulling clutch knob does it farWhen axial movement from medicine storehouse shell, the clutch knob is able to drive the check sleeve and does far from medicine storehouse shellAxial movement so that on the check sleeve second indexing tooth on the dial drum it is described first index tooth mutually nibbleIt closes.
Further, the upper end of the check sleeve is provided with multiple limit pawls, and multiple limit pawls form limitBit space；The clutch knob has button lid and button axis, and the button axis is fixed on the lower end surface of button lid, and the button axis is fastened on instituteIt states in limit space, and there is setting axial spacing between the button axis and the limit pawl.
Further, the upper end of the dial drum is fixed with active knob, and dial drum described in the active knob engagesConnection；
The upper surface of the active knob offers first through hole, and the button axis is threaded through in the first through hole.
Further, first detent mechanism includes the pawl that the outer surface of the check sleeve is arranged in, Yi JisheMultiple ratchets on the inner wall of the dial drum are set, multiple ratchets are uniformly distributed along the circumferential direction of the dial drum.
Further, the third clutch include the first spring, second spring, two-sided mesh piece, be set to it is describedThe first end face gear of the lower end of check sleeve and be set to the return barrel lower end second end face gear, it is described doubleThe upper surface of face mesh piece is provided with third face gear, and the lower end surface of the two-sided mesh piece is provided with the 4th face gear；First spring, the two-sided mesh piece and the second spring are respectively sleeved on the return barrel, wherein describedTwo springs are located at the top of the second end face gear, and the two-sided mesh piece is located at the top of the second spring, and describedOne spring is located at the top of the two-sided mesh piece, and the first end face gear is located at the top of first spring.
Further, the circumferential direction of the two-sided mesh piece is provided with feather key, and the inner wall of the pen tube is provided with and the cunningThe corresponding keyway of key；The feather key limit is in the keyway, so that the two-sided mesh piece can be along the axis of the pen tubeTo movement.
Compared with prior art, the invention has the benefit that
Injection pen provided by the invention, including dosage adjustment portion and medicine storehouse portion；Medicine storehouse portion is preinstalled with medicament for storingFlask for medicinal preparations；Dosage adjustment portion is used to adjust drug dose when injection, and makes the medicament of flask for medicinal preparations discharge setting dosage；Medicine storehouse portionIncluding medicine storehouse shell and the first clutch, the first clutch includes clutch base, one end of clutch base and medicine storehouse shellIt is detachably connected；Dosage adjustment portion includes pen tube, dial drum, check sleeve, return barrel and reverse-flighted screw；One end of pen tube withClutch base is detachably connected；Dial drum is threaded through in pen tube, and dial drum is threadedly coupled with pen tube；Check sleeve is threaded through quarterIt spends in cylinder, and is provided with the second clutch between the inner wall of dial drum and the upper end of check sleeve, for working as dial drum from penWhen being screwed out in pipe, make dial drum be able to drive check sleeve make rotating motion and far from medicine storehouse shell axial movement；Dial drumInner wall and check sleeve outer wall between be provided with the first detent mechanism, for making check sleeve do unidirectional rotary motion；It returnsJourney barrel is threaded through in check sleeve, and the upper end of return barrel and the upper end of check sleeve are connected together；Under check sleeveEnd and the lower end of return barrel between be provided with third clutch, for when dial drum screw in pen tube when, make check sleeve andReturn barrel does the axial movement close to medicine storehouse shell；Reverse-flighted screw is threaded through in return barrel, and reverse-flighted screw includes upper semisectionAnd lower semisection, upper semisection are threadedly coupled with return barrel.By the way that the first clutch is arranged, after the completion of injection, can be realizedThe original state of reverse-flighted screw returning back to before injection, the clutch base of the first clutch, which is detachably connected, realizes flask for medicinal preparationsIt is replaceable, to realize the recycling of resource, reduce the purchase cost of user, alleviate the burden of user.
Embodiment
Referring to shown in Fig. 1 to Figure 21, the embodiment of the invention provides a kind of injection pens, including dosage adjustment portion and medicine storehousePortion；Medicine storehouse portion is for storing the flask for medicinal preparations for being preinstalled with medicament；Dosage adjustment portion is used to adjust drug dose when injection, and makes medicineThe medicament of setting dosage is discharged in agent bottle, and user can be adjusted the size for wanting injection medicament dosage by dosage adjustment portion, work as adjustingAfter complete, then the medicament of setting dosage that makes to regulate by dosage adjustment portion is discharged flask for medicinal preparations and completes injection.
In the embodiment, medicine storehouse portion includes medicine storehouse shell 101 and the first clutch, and the first clutch includes clutchSeat 102, one end of clutch base and medicine storehouse shell is detachably connected, specifically, flask for medicinal preparations 160 inserts the storage of Chinese medicine storehouse shellIt deposits in chamber；Medicine storehouse shell is cylindrical, and the outer surface of medicine storehouse shell is provided with containing mark line 103, along the axial direction of medicine storehouse shellThere are two visual windows 104, two visual windows are symmetrical arranged by symmetry axis of the axis of medicine storehouse shell for direction setting, by canViewing window can see the surplus of flask for medicinal preparations Chinese medicine；The other end of medicine storehouse shell is provided with injection needle 105, the injection needleHead is detachably connected with medicine storehouse shell, and specific injection needle is connect with medicine storehouse outer casing screw, and the other end of medicine storehouse shell hasMedicine storehouse external screw thread, injection needle have syringe needle internal screw thread corresponding with medicine storehouse external screw thread.The outer surface of medicine storehouse shell is arranged withPen cap 106, the outer surface of medicine storehouse shell are provided with pen cap engaging boss 107, and the inner wall of pen cap, which is provided with, engages boss with pen capCorresponding broken line type card slot, broken line type card slot have vertical portion 108 and transverse part 109, first enter pen cap engaging bossThen vertical portion rotates pen cap, so that pen cap engaging boss is entered transverse part, just realize the card for having pen cap Yu medicine storehouse shell in this wayClose connection.In the embodiment, the quantity of pen cap engaging boss and the quantity of broken line type card slot are two, and two pen cap engagings are convexPlatform is symmetrical as symmetry axis using the axis of medicine storehouse shell, and two broken line type card slots are symmetrical axial symmetry point with the axis of pen capCloth；It should be noted that quantity, the quantity of broken line type card slot and their distribution situation of pen cap engaging boss can also basesActual conditions determine, such as it is 3 or 4 that pen cap, which engages the quantity of boss and the uniform amount of broken line type card slot,.In addition, can alsoSo that the quantity of broken line type card slot is greater than the quantity of pen cap engaging boss, such as the quantity of pen cap engaging boss is 2, broken line typeThe quantity of card slot is 4,6 or 8, and pen cap engaging boss is screwed in transverse part convenient for fast realize in this way, realizes pen cap and medicineStorehouse shell is connected together.Clutch base is connect with medicine storehouse outer casing screw, specifically, clutch base has spiral shell in clutch baseLine, medicine storehouse shell have clutch base external screw thread, in the embodiment, clutch base internal screw thread and the externally threaded screw thread of clutch baseRotation direction is dextrorotation.
In the embodiment, dosage adjustment portion includes pen tube 110, dial drum 111, check sleeve 112,113 and of return barrelReverse-flighted screw；One end of pen tube is detachably connected with clutch base, that is to say, that the lower end of pen tube detachably connects with clutch baseIt connects, pen tube is cylindrical, and clutch base is cylindrical, and the outer surface of clutch base is provided with pen tube boss 114 and positioning convex platform115；Pen tube boss and the uniformly distributed outer surface in clutch base of positioning convex platform；The quantity of pen tube boss is 4, convexThe quantity of platform is two, and the inner wall of pen tube is provided with annular pen tube limiting slot 117 corresponding with pen tube boss, the lower end of pen tubeIt is provided with pen tube locating slot 116 corresponding with positioning convex platform, the quantity of pen tube locating slot is two, and pen tube is fastened on clutchAfter on seat, pen tube boss limit in annular pen tube limiting slot, positioning convex platform limit pen tube locating slot in, need to illustrateIt is that in the implementation column, pen tube boss, positioning convex platform, pen tube locating slot can also determines according to actual conditions, for example, convexThe quantity of platform and pen tube locating slot is 1 or 3.
In the embodiment, reverse-flighted screw is threaded through in return barrel, and reverse-flighted screw includes upper semisection 118 and lower semisection 119,Upper semisection is threadedly coupled with return barrel.Lower semisection is connected with injection piston, specifically, lower semisection by rotating block 121 withInjection piston 120 connects, wherein the connection of the end of rotating block and lower semisection, and rotating block can turn around the axis of lower semisectionDynamic, injection piston is fixedly connected with rotating block, can be realized the rotation of injection piston in this way, in use, pushing away by injection pistonMedicament in dynamic flask for medicinal preparations makes it that flask for medicinal preparations be discharged.It, in this way can be with it should be noted that rotating block is detachably connected with lower semisectionReplace injection piston.Upper semisection has the first screw thread, and lower semisection has the second screw thread, the screw thread rotation of the first screw thread and the second screw threadTo on the contrary, the first screw thread nominal diameter be greater than the second screw thread nominal diameter, such lower semisection also enough enter return barrel andInterference will not be generated, that is to say, that；The thread rotary orientation of first screw thread be it is left-handed, the thread rotary orientation of the second screw thread is dextrorotation；FirstScrew thread and the second screw thread are double thread, by being arranged to double thread, can increase the movement that lead improves reverse-flighted screwSpeed.The screw pitch of first screw thread is 8.5mm, and the screw pitch of the second screw thread is 3mm.
In the embodiment, the first clutch further includes feed gear wheel 122 and clutch gear 123；Feed gear wheel and clutchGear is fastened in clutch base, and feed gear wheel can be meshed with clutch gear；Specifically, the lower end of feed gear wheelFace is provided with the gear teeth, and the upper surface of clutch gear is provided with the gear teeth, the gear teeth and clutch gear on the lower end surface of feed gear wheelThe gear teeth on upper surface are opposite；The tooth form of the gear teeth on feed gear wheel and clutch gear is isosceles triangle；It needs to illustrateIt is that the tooth form of the gear teeth on feed gear wheel and clutch gear may be obtuse triangle or right angled triangle, wherein right angle threeThe angular one of base angle for referring to the right angled triangle is right angle；That is, the wheel on feed gear wheel and clutch gearTooth can also be ratchet, for when another end motion of the reverse-flighted screw to medicine storehouse shell, i.e., moving towards the direction of injection needleWhen dynamic, it can prevent feed gear wheel from rotating together with reverse-flighted screw.Clutch gear can along the axial movement of clutch base, but fromClosing gear cannot rotate around the axis of clutch base, and feed gear wheel can be rotated around the axis of clutch base, also being capable of edgeThe axial movement of clutch base；Feed gear wheel is set on lower semisection, and feed gear wheel is threadedly coupled with lower semisection.It is specific andIt says, is provided with chuck 124 in clutch base；Chuck is provided with center card hole 125 and edge card hole 126, and feed gear wheel is provided withMultiple first card bases 127, clutch gear are provided with multiple second card bases 128, and the first card base is fastened in the card hole of center, the first cardFoot can be fastened in edge card hole along the axial movement of clutch base, the second card base, and the second card base can be along clutch baseAxial movement；When by not by the storage chamber of flask for medicinal preparations inserting powder charge storehouse shell, feed gear wheel is mutually separated with clutch gear, thisWhen, feed gear wheel can be rotated freely around the axis of clutch base, when that flask for medicinal preparations will be inserted the storage chamber of powder charge storehouse shell,Feed gear wheel is meshed with clutch gear, at this point, feed gear wheel cannot be rotated around the axis of clutch base.Feed gear wheel is also set upThere is the feeding screw thread matched with the second screw thread, the thread rotary orientation of the feeding screw thread is dextrorotation.
In the embodiment, dial drum is threaded through in pen tube, and dial drum is threadedly coupled with pen tube；Specifically, dial drumIt is threadedly coupled with pen tube by knurled nut 159, wherein knurled nut is connected together in dial drum, and knurled nut is set in quarterIt spends on cylinder.Knurled nut is made of transparent material；Dial drum is provided with sight vane 129, is provided with transparent scale on knurled nutWindow 130, transparent scale window are fastened in sight vane, and such knurled nut is just firmly fixed in pen tube；It is arranged on dial drumThere is scale external screw thread, knurled nut is provided with the scale internal screw thread matched with scale external screw thread, wherein scale external screw thread and quarterIt is left-handed for spending the rotation direction of internal screw thread；The externally threaded extending direction of scale is provided with dose calibration line 131 on dial drum, in this wayConvenient for accurate regulating dosage.
In the embodiment, check sleeve is threaded through in dial drum, and between the inner wall of dial drum and the upper end of check sleeveIt is provided with the second clutch, is rotated for when dial drum is screwed out from pen tube, making dial drum be able to drive check sleeve and doThe axial movement of movement and separate medicine storehouse shell；When dial drum screws in pen tube, dial drum makes rotating motion and close to medicine storehouseThe axial movement of shell, check sleeve only does the axial movement close to medicine storehouse shell, without making rotating motion.It needs to illustrateIt is that dial drum rotates clockwise just can screw out from pen tube namely dial drum does axial movement and rotation far from medicine storehouse shellMovement；Dial drum rotates counterclockwise screws in pen tube, wherein being watcher from the upper end of pen tube to the extending direction of the lower end of pen tubeTo the rotation counterclockwise of dial drum rotated clockwise with dial drum refers to from direction of observation, in addition the embodimentIn rotate clockwise and counterclockwise rotation refer to from direction of observation, be not repeated to describe herein.The inner wall of dial drumThe first detent mechanism is provided between the outer wall of check sleeve, for making check sleeve do unidirectional rotary motion；Specifically,When dial drum is screwed out from pen tube clockwise, check sleeve just does unidirectional rotary motion, that is to say, that check sleeve is done at this momentUp time rotary motion, and when dial drum screws in pen tube counterclockwise, check sleeve does not make rotating motion.Return barrel is threaded through inverseOnly in sleeve, and the upper end of return barrel and the upper end of check sleeve are connected together, and do single direction rotation when check sleeve for makingWhen movement, return barrel also does single rotary motion, and the direction of rotation of check sleeve is consistent with the direction of rotation of return barrel.It is provided with third clutch between the lower end of check sleeve and the lower end of return barrel, is used for when dial drum screws in pen tube,Check sleeve and return barrel is set to do the axial movement close to medicine storehouse shell, and check sleeve and return barrel cannot do and rotateMovement.
In the embodiment, the second clutch includes the multiple first indexing teeth being arranged on the inner wall of the upper end of dial drum132, and multiple second indexing teeth 133 of the upper end of check sleeve are set, inner wall of multiple first separation teeth along dial drumCircumferential direction be uniformly distributed, the circumferential directions of upper end of multiple second indexing teeth along check sleeve are uniformly distributed, the quantity of the first indexing toothIdentical as the second indexing quantity of tooth, the quantity of the first indexing tooth is 25.First indexing tooth is used to mutually nibble with the second indexing toothIt closes, and the height of the first indexing tooth is identical as the second indexing height of tooth, is 0.8mm.When dial drum screws out pen tube clockwiseWhen, the first indexing tooth indexes tooth with second and is meshed, and makes rotating motion and axis so that dial drum is able to drive check sleeveTo movement, when dial drum screws in pen tube counterclockwise, first indexing tooth with second index tooth mutually separates, the lower end of dial drum with it is inverseOnly sleeve abuts against, so that check sleeve can only axially move.
Specifically, the upper end of check sleeve is provided with clutch knob 134, when pulling clutch knob makes clutch knob itselfWhen doing the axial movement far from medicine storehouse shell, clutch knob is able to drive check sleeve and does the axial movement far from medicine storehouse shell,So that the second indexing tooth on check sleeve is meshed with the first indexing tooth on dial drum.The upper end of check sleeve is provided with moreA limit pawl 137, multiple limit pawls form limit spaces, and in the embodiment, the quantity for limiting pawl is 2；Clutch rotationButton has button lid 135 and button axis 136, and button axis is fixed on the lower end surface of button lid, and button axis is fastened in limit space, and button axis and limitThere is setting axial spacing, specifically, this sets the distance of axial spacing as 0.8mm, that is to say, that clutch between the pawl of positionIt rotates to when doing the axial movement far from medicine storehouse shell, when axial movement distance is 0.8mm, just makes the second indexing tooth and theOne division tooth is meshed.Clutch knob can be rotated freely around the axis of pen tube, also can be along the axial movement of pen tube.Dial drumUpper end be fixed with active knob 139, and active knob dial drum is connected together, and active knob is internally provided with knob cardSlot, the upper end of dial drum are provided with knob chuck 140, and knob chuck limits in knob card slot.The outer surface of active rotationCircumferentially it is provided with skid resistance strip.The upper surface of active knob offers first through hole, and button axis is threaded through in first through hole.
In the embodiment, the first detent mechanism includes the pawl 141 that the outer surface of check sleeve is arranged in, and setting existsMultiple ratchets 145 on the inner wall of dial drum, multiple ratchets are uniformly distributed along the circumferential direction of dial drum, in first detent mechanismPawl has elasticity；When dial drum screws out pen tube clockwise, pawl is by ratchet backstop, so that check sleeve can be with quarterCylinder rotation is spent, when dial drum screws in pen tube counterclockwise, pawl cannot be by ratchet backstop, so that check sleeve can not be withDial drum rotation, that is to say, that realize check sleeve and only do unidirectional rotary motion.In addition when dial drum screws in pen tube counterclockwiseWhen, pawl is in contact with ratchet, can generate the sound rattled away, user is by listening sound to will appreciate that injection pen works normally.SpineThe width of the facewidth of tooth is not less than the externally threaded length of scale on dial drum, wherein axial direction of the facewidth of ratchet along ratchetWidth.The quantity of pawl is 1, and the quantity of ratchet is 25, can also realize the accurate of injection volume by pawl and ratchetIt adjusts, and when realizing injection, the rotational angle that dial drum is counterclockwise.The circumferential direction of the outer surface of check sleeve is additionally provided with ringShape sizing boss 146 can guarantee that the axis of check sleeve is overlapped with the axis of dial drum by annular sizing boss, ensure thatPawl in dial drum with the degree of engagement of ratchet.
In the embodiment, the upper end of check sleeve has card slot 147, and the upper end of return sleeve has card column 148, and card column is setIt sets in card slot, in this way when check sleeve makes rotating motion and is axially moved, return sleeve can also be done with check sleeveRotary motion and axial movement.The quantity of card column be it is multiple, the quantity of card slot is multiple；In the embodiment, card column and card slotQuantity is 6.
In the embodiment, third clutch includes the first spring 149, second spring 150, two-sided mesh piece 151, settingIn the lower end of check sleeve first end face gear 152 and be set to return barrel lower end second end face gear 153, it is doubleThe upper surface of face mesh piece is provided with third face gear 154, and the lower end surface of two-sided mesh piece is provided with the 4th face gear155；First spring, two-sided mesh piece and second spring are respectively sleeved on return barrel, wherein second spring is located at second endThe top of face gear, two-sided mesh piece are located at the top of second spring, and the first spring is located at the top of two-sided mesh piece, first endFace gear is located at the top of the first spring.Specifically, the lower end surface of first end face gear is provided with the gear teeth, second end face gearUpper surface be provided with the gear teeth, the gear teeth on first end face gear with the gear teeth on third face gear for being meshed, secondThe gear teeth on end face with the gear teeth on the 4th face gear for being meshed；The gear teeth, third end-tooth on first end face gearThe gear teeth on the gear teeth and the 4th face gear on the gear teeth, second end face on wheel can be ratchet or be isosceles triangleTooth；The circumferential direction of two-sided mesh piece is provided with feather key, and the inner wall of pen tube is provided with keyway corresponding with feather key；Feather key is limited in keyIn slot, so that two-sided mesh piece can be along the axial movement of pen tube.The quantity of feather key is two, and the quantity of keyway is two, keyThe length direction of slot and the axial direction of pen tube are parallel, the length of keyway and the equal length of pen tube；Mesh piece two-sided in this way is onlyIt can cannot make rotating motion around the axis of pen tube in pen tube along the axial movement of pen tube, the circumferential direction of two-sided mesh piece is also setIt is equipped with positioning ring 158, can guarantee the axis of two-sided mesh piece and the axis collinear of pen tube by positioning ring.Upon injection, it carvesDegree cylinder screws in pen tube counterclockwise, and the upper surface of the first end face gear of the lower end and lower end of check sleeve of dial drum abuts against,In second clutch, the first indexing tooth on dial drum is mutually separated with the second indexing tooth on check sleeve, the first pawl machinePawl in structure on check sleeve no longer plays backstop action to the ratchet on dial drum, therefore dial drum pushes check sleeve and leans onThe axial movement of nearly medicine storehouse shell, the first spring and second spring are compressed, the gear teeth on such first end face gear just withThe gear teeth on third face gear are meshed, and the gear teeth in second end face are just meshed with the gear teeth on the 4th face gear, thisSample check sleeve, two-sided mesh piece and return barrel just form an entirety, synchronize movement, since two-sided mesh piece can onlyAxial direction along pen tube moves, thus dial drum screw in counterclockwise pen container it is mobile to the direction close to medicine storehouse shell when, checkSleeve and return barrel can only also do to the direction close to medicine storehouse shell and axially move, and cannot make rotating motion；It needsIt is bright, since when dial drum, which pushes check sleeve, does close to the axial movement of medicine storehouse shell, dial drum does rotation counterclockwiseMovement, therefore check sleeve has the tendency that making rotating motion, but due to the gear teeth on first end face gear just with third end faceThe gear teeth on gear are meshed, and the gear teeth in second end face are just meshed with the gear teeth on the 4th face gear and two-sided engagementThe cause that part can only be axially moved, therefore prevent the rotary motion of check sleeve and return barrel.
In the embodiment, knurled nut 159 is also provided with feather key 156, and the feather key of knurled nut also limits in keyway 157,The connection that can reinforce knurled nut and pen tube in this way prevents knurled nut from rotating around the axis of pen tube.Active knob and scale spiral shellThe second ratchet mechanism is provided between mother, the second ratchet mechanism includes the ratchet being arranged on active knob and is arranged in scale spiral shellRatchet on mother, the ratchet on active knob for being meshed with the ratchet on knurled nut, when on active knob ratchet withAfter ratchet on knurled nut is meshed, active knob can only do clockwise rotary motion around the axis of pen tube, and cannot doRotary motion counterclockwise can be prevented after the completion of injection, the zero graduation line on dial drum by the way that the second ratchet mechanism is arrangedIt misplaces with transparent scale window.
The working principle of injection pen provided in an embodiment of the present invention are as follows:
1, the dosage Principles of Regulation before injecting
Feed gear wheel and clutch gear phase after flask for medicinal preparations to be inserted into the storage chamber of medicine storehouse shell, in the first clutchEngagement, feed gear wheel, which cannot make rotating motion, to axially move；In third clutch, due to the work of the first springWith the gear teeth on gear teeth third face gear on first end face gear mutually separate, due to the effect of second spring, second end faceOn the gear teeth just mutually separated with the gear teeth on the 4th face gear.Clutch knob is pulled to make in the second clutch, on dial drumThe first separation tooth index tooth with second on check sleeve and be meshed, rotate clockwise dial drum in this way, dial drum is from pen tubeWhen middle back-out, check sleeve just also makes rotating motion and does the axial movement far from medicine storehouse shell, due to check sleeve and returnBarrel is connected together, therefore return barrel also makes rotating motion and do the axial movement far from medicine storehouse shell, due to reverse-flighted screwUpper semisection on the first screw thread and lower semisection on the second screw thread thread rotary orientation on the contrary, therefore when return barrel rotate when,Reverse-flighted screw can keep opposing stationary with pen tube, that is to say, that the rotation of return barrel, reverse-flighted screw are not rotated, just realized in this wayDosage before having injection is adjusted.
2, principle is injected
When adjusting injection after required drug dose, unclamp clutch knob, in the second clutch, on dial drum theOne separation tooth is mutually separated with the second indexing tooth on check sleeve, is pressed clutch knob, just dial drum is made to screw in pen counterclockwisePipe, since the upper surface of the first end face gear of the lower end and lower end of check sleeve of dial drum abuts against, check sleeve byTo the effect of downward power, the first spring and second spring are just compressed, and the gear teeth on such first end face gear are just withThe gear teeth on three face gears are meshed, and the gear teeth in second end face are just meshed with the gear teeth on the 4th face gear, in this wayCheck sleeve, two-sided mesh piece and return barrel just form an entirety, synchronize movement, additionally, due to the first detent mechanismCheck sleeve can only be made to do unidirectional rotary motion, the pawl on check sleeve no longer plays backstop to the ratchet on dial drum and makees at this timeWith since two-sided mesh piece can only be moved along the axial direction of pen tube, check sleeve and return barrel are just only done to closeThe direction of medicine storehouse shell axially moves, due to the upper semisection screw connection of return barrel and reverse-flighted screw, due to upper semisection byThe downward axial force of return barrel, therefore the upper semisection of reverse-flighted screw just constantly screws in return barrel, in addition reverse-flighted screwUpper semisection and lower semisection are an entirety, and such lower semisection is also by the downward axial force of return barrel, therefore reverse-flighted screwLower semisection just constantly screw in feed gear wheel downwards, such injection piston is just mobile to the direction of injection needle in flask for medicinal preparations,Medicament in flask for medicinal preparations is just discharged, to realize injection.
3, principle is reused
Flask for medicinal preparations is taken out out of medicine storehouse shell, clutch base and medicine storehouse shell are dismantled, such feed gear wheel and clutchGear is just separated and is no longer meshed, and feed gear wheel just can rotate freely in the card hole of center, and reverse-flighted screw is returned to note in this wayWhen state before penetrating, the upper semisection of reverse-flighted screw just can rotate freely in return barrel, due to feed gear wheel at this time can fromBy rotating, therefore feed gear wheel can also be rotated freely with the lower semisection of reverse-flighted screw, just avoid on upper semisection in this wayThe second screw thread on one screw thread and lower semisection generates interference, and upper semisection is enabled smoothly to return back to original state, just real in this wayShow the rollback of reverse-flighted screw, namely reuses injection pen.
In conclusion injection pen provided in this embodiment passes through the first clutch of setting, after the completion of injection, Neng GoushiThe original state of existing reverse-flighted screw returning back to before injection, the clutch base of the first clutch, which is detachably connected, realizes medicamentBottle it is replaceable, to realize the recycling of resource, reduce the purchase cost of user, alleviate the burden of user.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extentPipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according toSo be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features intoRow equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solutionThe range of scheme.