CN102716529A - Pen injector - Google Patents

Abstract

The invention provides a pen injector, which comprises a medicine bottle mounting part, a retaining plug assembly and a metering and injection assembly. The metering and injection assembly comprises a drum support, a push rod drum, a connecting cylinder, a sleeve stud and a push rod, wherein the drum support is tubular, and the inner wall of the drum support is provided with thread-shaped chutes; the push rod drum is movably arranged in the drum support along the axial direction of the drum support; the outer wall of the push rod drum is provided with spiral retaining strips matched with the thread-shaped chutes; the second end of the push rod drum is protruded at the second end of the drum support and is connected with a rotary operation part; the connecting cylinder is arranged in the push rod drum; the first end of the connecting cylinder is abutted with a first limit step; the second end of the connecting cylinder is connected with a press operation part; the sleeve stud and the connecting cylinder are synchronously and rotatablely arranged in the connecting cylinder and are invariable in position along the axial direction and relative to the drum support; the sleeve stud is provided with a threaded through hole; and the push rod movably penetrates in the sleeve stud along the axial direction. The pen injector provided by the invention not only can be recycled and can be regulated in injection quantity but also is simple in operation and convenient in use.

Description

Pen-type injector

Technical field

The present invention relates to the injection device technical field, in particular to a kind of pen-type injector.

Background technology

In the prior art, a lot of glycosuria patients rely on insulin injection to carry out blood sugar lowering, because to the dependence of insulin, the frequency of patient infusion insulin is frequent gradually, like this, increasing patient more is ready to select to be in insulin injection voluntarily.

Application number is that 200920101143.6 Chinese patent discloses a kind of full-automatic insulin syringe, this patent reach inserting needle and injection automatically quick and precisely, purpose such as painless.

But said syringe has and following defective:

One, this syringe does not have the device of changing dressings, and using once just needs to change syringe afterwards, has caused great waste like this.

Two, there is not the injection adjusting device.The insulin dose of glycosuria patient per injection in various degree is all inequality, and this syringe versatility is relatively poor.Because of insulin is more valuable, can't regulates dosage and possibly cause waste again.

Summary of the invention

The present invention aims to provide and a kind ofly can reuse, regulates injection volume, and pen-type injector simple to operate, easy to use.

To achieve these goals, the invention provides a kind of pen-type injector, comprising: the medicine bottle installation portion, its first end removably is connected with syringe needle, and second end of medicine bottle installation portion has the installing hole that is used to install medicine bottle; Fixing plug assembly, first end removably is connected second end of medicine bottle installation portion, and fixedly plug assembly has axially extending bore, and the inwall of axially extending bore is provided with the push rod rotation prevention portion; Metering and injecting assembly are connected with fixing second end of plug assembly, measure and injecting assembly comprises: the rotating cylinder support, and its first end is connected with fixing second end of plug assembly, and the rotating cylinder support is and has the screw-like chute on tubular and the inwall; The push rod rotating cylinder; Axially-displaceable along the rotating cylinder support is arranged in the rotating cylinder support movingly; Has the spiral card article that matches with the screw-like chute on the outer wall of push rod rotating cylinder; The first end end face of push rod rotating cylinder has first limited step that radially extends internally, and second distal process of push rod rotating cylinder is started from second end of rotating cylinder support and is connected with rotating operation portion; Connect tube, be arranged in the push rod rotating cylinder, connect first end and the first limited step butt of tube, second end that connects tube is connected with press operating part; The sleeve double-screw bolt rotates in the company's of being arranged on tube and with connecting tube synchronously, and the relative rotating cylinder support of sleeve double-screw bolt is invariant position vertically, and the sleeve double-screw bolt has tapped through hole; Push rod; Be located in the sleeve double-screw bolt vertically movably; And first end of push rod passes the fixedly axially extending bore of plug assembly; The push rod outer surface has the external screw thread that cooperates with tapped through hole, and the outer surface of push rod has that extend and that match with the push rod rotation prevention portion vertically spline chute, and first end of push rod removably is connected with the push rod cup that is used to promote the piston in the medicine bottle opening.

Further, fixedly plug assembly comprises: fixing plug body, and first end removably is connected second end of medicine bottle installation portion, and the inwall of fixing plug body has second limited step; The coyote hole top; Be arranged on movably vertically in the fixing plug body; Has the 3rd limited step on the inwall on coyote hole top; Have the first axial convex tendon on the inwall of the 3rd limited step to form the push rod rotation prevention portion, second end on coyote hole top has the first limited portion, has the second limited portion on the outer wall on coyote hole top; Double sided gear; Spacing second end at fixing plug body; Second limited of coyote hole top is spacing between the double sided gear and second limited step, and the first surface of double sided gear has the coyote hole top rotation prevention portion that cooperates with first limited, and the second surface of double sided gear has the first counting tooth; First spring is arranged between the first surface of the 3rd limited step and double sided gear on coyote hole top, and wherein, fixedly the endoporus that pushed up by coyote hole of the axially extending bore of plug assembly and the endoporus of double sided gear form.In fixing plug assembly, first limited second end that is formed on the coyote hole top, and, in the minimizing number of parts, can improve the structural stability of syringe of the present invention through double sided gear engages fixed plug assembly and metering and injecting assembly simultaneously.

Further, first limited is first axial tooth and second axial tooth that cooperatively interacts with coyote hole top rotation prevention portion.

Further, have the strip buckle on the second end outer wall of medicine bottle installation portion, have first bayonet socket that is clasped with strip on the sidewall of fixing plug body.

Further, second end of fixing plug body has first Access Division, has second Access Division that cooperates with first Access Division on the sidewall of double sided gear, and double sided gear is through spacing second end at fixing plug body of the cooperation of first Access Division and second Access Division.

Further; First Access Division is two elastic cards that are oppositely arranged; The inwall of elastic card is provided with the first wedge shape buckle, and second Access Division of double sided gear is the first wedge shape fixture block, and the both sides of the corresponding first wedge shape fixture block also are provided with double sided gear spline piece on the inwall of first Access Division.

Further, also be provided with the rotating cylinder stand connection between two elastic cards, rotating cylinder stand connection outer surface has the second wedge shape fixture block, and first end of rotating cylinder support has second bayonet socket that cooperates with the second wedge shape fixture block.

Further, have the 4th limited step on the inwall of rotating cylinder support near first end, have the screw-like chute on the inwall between second end of the 4th limited step to the rotating cylinder support of rotating cylinder support, second end of rotating cylinder support has the 3rd Access Division.

Further, metering and injecting assembly also comprise: lock bracket, be connected at second end of rotating cylinder support with the 3rd Access Division of rotating cylinder support, and lock bracket is spacing in the rotating cylinder support with the spiral card article of push rod rotating cylinder.

Further, the 3rd Access Division comprises clamping opening and the 3rd bayonet socket on the sidewall of rotating cylinder support second end, lock bracket have the card post that cooperates with the clamping opening and with the 4th wedge shape fixture block of the 3rd bayonet fittings.

Further; The second surface butt of sleeve double-screw bolt first end and double sided gear; The sleeve double-screw bolt has the 5th limited step on the lateral wall; The 5th limited step between the 4th limited step of double sided gear and rotating cylinder support and with the 4th limited step butt, the sleeve double-screw bolt receives double sided gear and the 4th limited step is spacing to realize relative rotating cylinder support invariant position vertically.

Further, even have first driving section on the inwall of tube, the outer wall of sleeve double-screw bolt is provided with second driving section and the 3rd driving section that is positioned at the 5th limited step both sides, and second driving section cooperates with first driving section.

Further; Metering and injecting assembly also comprise: inject the tooth of beating; Be arranged between the 5th limited step of sleeve double-screw bolt of double sided gear and rotating cylinder support and be set in outside the sleeve double-screw bolt; Injection is beated and is had the 4th driving section that cooperates with the 3rd driving section of sleeve double-screw bolt on the inwall of tooth, injection beat have on the first surface of tooth cooperate with the first counting tooth of double sided gear second count tooth; Second spring is arranged on injection and beats between the 4th limited step of second surface and rotating cylinder support of tooth.

Further, the first counting tooth, the second counting tooth are anti-reverse ratchet.

Further, first driving section and the 4th driving section are the second axial convex tendon, and second driving section and the 3rd driving section are axial notch.

Further, the first counting tooth, the second counting tooth are axial tooth, have the first axial grooving between adjacent two teeth of the first counting tooth, have the second axial grooving between adjacent two teeth of the second counting tooth.Further; Connect tube and be the ladder tubular, comprise be positioned at first of first end connect tube portion be positioned at second end second connect tube portion, first even the internal diameter of tube portion greater than second internal diameter of tube portion even; The inwall of the first tube portion of company has first driving section, even has the 3rd counting tooth on the ladder end face of tube.

Further, rotating operation portion comprises: hopper, be set in rotating cylinder support outer and the middle part of hopper and the second end clamping of push rod rotating cylinder, and have addend effect tooth spline fixture block on the inwall of hopper; The encapsulate ring is set in outside the hopper and with hopper and rotates synchronously, has the 6th limited step of the end face that radially protrudes in hopper on the inwall of encapsulate ring.

Further, press operating part is a caudal peduncle, and caudal peduncle comprises plate-like press section and a plurality of connecting portions that are connected with the plate-like press section, and connecting portion cooperates the connecting portion of caudal peduncle spacing in the encapsulate ring with the 6th limited step of encapsulate ring.

Further, hopper is circumferentially with metering scale near the outer surface upper edge of encapsulate ring.

Further, metering and injecting assembly also comprise: addend effect tooth, have the draw-in groove that cooperates with addend effect tooth spline fixture block, and addend effect tooth has the 4th counting tooth towards the surface of push rod rotating cylinder, and addend effect tooth has the through hole of dodging; Add the subtrahend gear of beating; Be arranged in the hopper, add the subtrahend gear of beating and be the ladder tubular, comprise that being positioned at the 3rd of first end connects tube portion and the 4th tube portion of company that is positioned at second end; The internal diameter of the 3rd tube portion of company is greater than the internal diameter of the 4th tube portion of company; The 4th connects tube portion passes and dodges through hole, the 3rd connect tube portion end face be provided with cooperates with the 3rd counting tooth the 5th count tooth, add subtrahend beat have on the ladder end face of gear with the 4th count that tooth cooperates the 6th count tooth; The 3rd spring is arranged between the plate-like press section of addend effect tooth and caudal peduncle.

Further, the 3rd counting tooth, the 4th counting tooth, the 5th counting tooth and the 6th counting tooth are axial tooth, have the 3rd axial grooving between adjacent two teeth of the 4th counting tooth, the 5th counting tooth and the 6th counting tooth.

The use of pen-type injector of the present invention is following:

When regulating dosage; Patient's rotated operating portion; And then drive the rotation of push rod rotating cylinder, and the push rod rotating cylinder is through the cooperation of spiral card article and screw-like chute, and the push rod rotating cylinder rotates and withdraws from the rotating cylinder support gradually; Drive to connect tube through first limited step when push rod rotating cylinder is retreated and retreat and then drive press operating part and retreat, the displacement that connects on only having axially when tube is retreated is not rotated.Thereby can rotating operation portion or the push rod rotating cylinder be provided with metering scale and make things convenient for the patient to check dosage.If it is excessive to regulate, the patient can get final product by the counter-rotation operating portion.

It should be noted that connecting tube in the whole adjustment process does not rotate, and then can not drive the rotation of sleeve double-screw bolt, like this, the interior piston of opening that push rod just can not advance yet and promote medicine bottle.

Regulate and inject after dosage finishes; The patient presses press operating part; Power is passed to from press operating part connects on the tube, first end and first limited step of the company's of making tube compress, and the cooperation through spiral card article and screw-like chute after the push rod rotating cylinder is stressed progresses into the rotating cylinder support; Owing to stressedly between first end that connects tube and first limited step compress each other, connect a rotation so in push rod rotating cylinder rotating process, can drive with the frictional force between first limited step through first end that connects tube.When connecting the tube rotation; The sleeve double-screw bolt rotates with connecting tube synchronously; Because fixedly the inwall of the axially extending bore of plug assembly is provided with the push rod rotation prevention portion, this push rod rotation prevention portion cooperates with the spline chute of the outer surface of push rod, makes push rod only can carry out rectilinear motion vertically and can not rotate.Like this, thereby the rotation of sleeve double-screw bolt can drive the interior piston-advance of opening that push rod travels forward and promotes medicine bottle, reduces the resistance of piston-advance, and then the completion injection, makes things convenient for the patient to use.

Pen-type injector of the present invention has the following advantages:

1) device can reuse, for the patient practices thrift.Apparatus of the present invention only need be changed the medicine bottle of medicines such as insulin, and just throw away pen after needn't accomplishing a shot.Thereby can practice thrift the expense of buying pen for the patient, also practice thrift social resources simultaneously.

2) patient can very accurately accomplish injection.

3) if the patient in when injection, transfers injection volume many or transfers fewly, this device can be realized increasing progressively and successively decrease and also needn't take off medicine bottle when operate, and the patient also needn't worry when readjustment, can produce leakage, reaches the liquid medicine wasting phenomenon.

4) this device is simple to operate, and is reliable.

Description of drawings

The Figure of description that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 shows the decomposing schematic representation according to the embodiment of pen-type injector of the present invention;

Fig. 2 shows the generalized section of the pen-type injector of Fig. 1;

Fig. 3 shows the generalized section of fixedly plug assembly of the pen-type injector of Fig. 1;

Fig. 4 shows the perspective view of fixedly plug body of the fixedly plug assembly of Fig. 3;

Fig. 5 a shows the perspective view on coyote hole top of the fixedly plug assembly of Fig. 3;

Fig. 5 b shows the perspective view of another angle on the coyote hole top of Fig. 5 a;

Fig. 6 shows the perspective view of double sided gear of the fixedly plug assembly of Fig. 3;

Fig. 7 shows the perspective view of another angle of the double sided gear of Fig. 6;

Fig. 8 shows injection and the generalized section of gauge assembly of the pen-type injector of Fig. 1;

Fig. 9 shows the perspective view of rotating cylinder support of injection and the gauge assembly of Fig. 8;

Figure 10 shows the perspective view of push rod rotating cylinder of injection and the gauge assembly of Fig. 8;

Figure 11 shows the perspective view of lock bracket of injection and the gauge assembly of Fig. 8;

Figure 12 shows the perspective view of company's tube of injection and the gauge assembly of Fig. 8;

Figure 13 shows the perspective view of sleeve double-screw bolt of injection and the gauge assembly of Fig. 8;

The beat perspective view of tooth of the injection that Figure 14 shows injection and the gauge assembly of Fig. 8;

Figure 15 shows the perspective view of push rod of injection and the gauge assembly of Fig. 8;

Figure 16 shows the perspective view of hopper of injection and the gauge assembly of Fig. 8;

Figure 17 shows the perspective view of caudal peduncle of injection and the gauge assembly of Fig. 8;

Figure 18 shows the perspective view of addend effect tooth of injection and the gauge assembly of Fig. 8;

Figure 19 show Fig. 8 injection and gauge assembly add the beat perspective view of gear of subtrahend;

Figure 20 shows the perspective view of medicine bottle installation portion of the pen-type injector of Fig. 1;

Figure 21 shows the surface structure sketch map of the pen-type injector of Fig. 1; And

Figure 22 shows the metering scale sketch map of the hopper of Figure 16.

The specific embodiment

Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.

Wherein, for syringe overall structure of the present invention and each assembly, the following stated first end is an end that points to the nib direction, and second end is an end that points to a tail direction.

As shown in Figure 1, the pen-type injector of present embodiment comprises: medicinebottle installation portion 2, fixedly plug assembly and metering and injecting assembly.As shown in Figure 2, medicinebottle installation portion 2 first ends removably are connected withsyringe needle 1, and second end of medicinebottle installation portion 2 has the installing hole that is used to install medicine bottle.Fixedly first end of plug assembly removably is connected second end of medicinebottle installation portion 2, and fixedly plug assembly has axially extending bore, and the inwall of axially extending bore is provided with the push rod rotation prevention portion.

Metering and injecting assembly are connected with fixing second end of plug assembly, and be as shown in Figure 8, and metering and injecting assembly comprise: rotating cylinder support 11, push rod rotating cylinder 12, connect tube 15, sleeve double-screw bolt 14 and push rod 4.First end of rotating cylinder support 11 is connected with fixing second end of plug assembly, and rotating cylinder support 11 is and has screw-like chute 1102 on tubular and the inwall; Push rod rotating cylinder 12 is arranged in the rotating cylinder support 11 along the axially-displaceable of rotating cylinder support 11 movingly; Shown in figure 10; Has the spiral card article 1201 that matches with screw-like chute 1102 on the outer wall of push rod rotating cylinder 12; This screw-like chute 1102 preferably is arranged on push rod rotating cylinder 12 towards fixing first end of plug assembly; The first end end face of push rod rotating cylinder 12 has first limited step 1202 that radially extends internally, and second end 1203 of push rod rotating cylinder 12 protrudes in second end of rotating cylinder support 11 and is connected with rotating operation portion; Connect tube 15 and be arranged in the push rod rotating cylinder 12, connect first end and first limited step, 1202 butts of tube 15, second end that connects tube 15 is connected with press operating part; Rotate synchronously in sleeve double-screw bolt 14 companies of the being arranged on tube 15 and with connecting tube 15, sleeve double-screw bolt 14 relative rotating cylinder supports 11 are invariant position vertically, and shown in figure 13, sleeve double-screw bolt 14 has tapped through hole 1401; Push rod 4 is located in the sleeve double-screw bolt 14 vertically movably; And first end of push rod 4 passes the fixedly axially extending bore of plug assembly; Shown in figure 15; Push rod 4 outer surfaces have the external screw thread 401 that cooperates with tapped through hole 1401, and the outer surface of push rod 4 also has vertically the spline chute 402 that extends and match with the fixing push rod rotation prevention portion of plug assembly, and first end of push rod 4 removably is connected with the push rod cup 403 that is used to promote the piston in medicine bottle 3 openings.

The use of the pen-type injector of present embodiment is following:

When regulating dosage; Patient's rotated operating portion; And then drive 12 rotations of push rod rotating cylinder, and pushrod rotating cylinder 12 is through the cooperation ofspiral card article 1201 and screw-like chute 1102, and pushrod rotating cylinder 12 rotates and withdraws from rotatingcylinder support 11 gradually; Retreat and then drive press operating part through first limited step, 1202 company's ofdrive tubes 15 when pushrod rotating cylinder 12 is retreated and retreat, the displacement that connects on only having axially whentube 15 is retreated is not rotated.Thereby can rotating operation portion being provided with metering scale makes things convenient for the patient to check dosage.If it is excessive to regulate, the patient can get final product by the counter-rotation operating portion.

It should be noted that connectingtube 15 in the whole adjustment process does not rotate, and then can not drive 14 rotations of sleeve double-screw bolt, like this, the interior piston of opening that pushrod 4 just can not advance yet and promotemedicine bottle 3.

Regulate and inject after dosage finishes; The patient presses press operating part; Power is passed on company'stube 15 from press operating part; First end and firstlimited step 1202 of the company's of makingtube 15 compress; The stressed back of pushrod rotating cylinder 12 progresses intorotating cylinder support 11 through the cooperation ofspiral card article 1201 and screw-like chute 1102, owing to stressedly between first end that connectstube 15 and firstlimited step 1202 compress each other, connects 15 rotation so in pushrod rotating cylinder 12 rotating process, can drive with the frictional force between firstlimited step 1202 through first end that connects tube 15.When connectingtube 15 rotations; Sleeve double-screw bolt 14 rotates with connectingtube 15 synchronously; Because fixedly the inwall of the axially extending bore of plug assembly is provided with the push rod rotation prevention portion; This push rod rotation prevention portion cooperates with thespline chute 402 of the outer surface ofpush rod 4, makespush rod 4 only can carry out rectilinear motion vertically and can not rotate.Like this, thereby the rotation of sleeve double-screw bolt 14 can drive the interior piston-advance of opening that pushrod 4 travels forward and promotesmedicine bottle 3, and then accomplishes injection.

Those skilled in the art can know that pen-type injector of the present invention goes for the injection of multiple medicine, are not limited to the injection of insulin.

Preferably, to shown in Figure 7, fixedly plug assembly comprises like Fig. 3: fixing plug body 10, coyote hole top 5, double sided gear 7 and first spring 6.First end of fixing plug body 10 removably is connected second end of medicine bottle installation portion 2, and the inwall of fixing plug body 10 has second limited step 101; Coyote hole top 5 is arranged in the fixing plug body 10 vertically movably; Has the 3rd limited step 501 on the inwall on coyote hole top 5; Has the first axial convex tendon 502 on the inwall of the 3rd limited step 501 to form the push rod rotation prevention portion; Second end on coyote hole top 5 has first limited 503, has second limited 504 on the outer wall on coyote hole top; Double sided gear 7 spacing second ends at fixing plug body 10; Second limited 504 of coyote hole top 5 is spacing between the double sided gear 7 and second limited step 101; The first surface 702 of double sided gear 7 has the coyote hole top rotation prevention portion 703 that cooperates with first limited 503, and the second surface 704 of double sided gear 7 has the first counting tooth 705; First spring 6 is arranged between the first surface 702 of the 3rd limited step 501 and double sided gear 7 on coyote hole top 5, and wherein, fixedly the axially extending bore of plug assembly pushes up 5 endoporus by coyote hole and the endoporus of double sided gear 7 forms.

Need change dressings thebottle 3 o'clock;New medicine bottle 3 is packed in the medicinebottle installation portion 2, the opening ofmedicine bottle 3 is withstoodcoyote hole top 5, first spring, 6 compressions this moment;Coyote hole top 5 is headed in the fixingplug body 10 bymedicine bottle 3; And second end oncoyote hole top 5 has first limited 503 coyote hole toprotation prevention portion 703 contact matching with thefirst surface 702 of doublesided gear 7, makes thatcoyote hole top 5 is fixing.

When laying down medicinebottle installation portion 2 withmedicine bottle 3, coyote hole top 5 breaks away from doublesided gear 7 mesothecium toprotation prevention portions 703 under the effect of first spring, 6 restoring forces.Promotepush rod 4, makepush rod 4 in sleeve double-screw bolt 14, rotate, and then drive 5 rotations of coyote hole top, till can not promoting.

As shown in Figure 4; Preferably; Second end of fixingplug body 10 hasfirst Access Division 102; Havesecond Access Division 701 that cooperates withfirst Access Division 102 on the sidewall of doublesided gear 7, doublesided gear 7 is through spacing second end at fixingplug body 10 of the cooperation offirst Access Division 102 and second Access Division 701.Further preferably; As shown in Figure 3; First two elastic cards ofAccess Division 102 for being oppositely arranged; The inwall of elastic card is provided with the first wedge shape buckle, andsecond Access Division 701 of doublesided gear 7 is the first wedge shape fixture block, and the both sides of the corresponding first wedge shape fixture block also are provided with double sidedgear spline piece 102a on the inwall of first Access Division 102.Double sidedgear spline piece 102a is used for fixing doublesided gear 7, and it can not be rotated.

Like Fig. 4 and shown in Figure 9; Also be provided with rotatingcylinder stand connection 104 between two elastic cards; Rotatingcylinder stand connection 104 outer surfaces have the second wedgeshape fixture block 104a, and first end of rotatingcylinder support 11 hassecond bayonet socket 1104 that cooperates with the second wedgeshape fixture block 104a.

Preferably, first limited 503 is first axial tooth and second axial tooth that cooperatively interacts with coyote hole top rotation prevention portion 703.Certainly, the embodiment that can know as those skilled in the art, first limited 503 also can be the fixture block that cooperatively interacts with coyote hole toprotation prevention portion 703.

Like Fig. 8 and shown in Figure 9; Has the 4thlimited step 1101 on the inwall of rotatingcylinder support 11 near first end; Have screw-like chute 1102 on the inwall between second end of the 4thlimited step 1101 to rotatingcylinder support 11 of rotatingcylinder support 11, second end of rotatingcylinder support 11 has the3rd Access Division 1103.

Like Fig. 8 and shown in Figure 11, metering and injecting assembly also comprise: lockbracket 13, be connected at second end of rotatingcylinder support 11 with the 3rd Access Division of rotatingcylinder support 11, and lockbracket 13 is spacing in rotatingcylinder support 11 with thespiral card article 1201 of pushrod rotating cylinder 12.

Preferably, the3rd Access Division 1103 comprises clamping opening and the 3rd bayonet socket on the sidewall ofrotating cylinder support 11 second ends, and is shown in figure 11,lock bracket 13 have thecard post 1301 that cooperates with the clamping opening and with the 4th wedgeshape fixture block 1302 of the 3rd bayonet fittings.

Like Fig. 2, Fig. 3, Fig. 8 and shown in Figure 13;Second surface 704 butts of sleeve double-screw bolt 14 first ends and doublesided gear 7; Has the 5thlimited step 1402 on sleeve double-screw bolt 14 lateral walls; The 5thlimited step 1402 between the 4thlimited step 1101 of doublesided gear 7 androtating cylinder support 11 and with the 4thlimited step 1101 butts, sleeve double-screw bolt 14 receives doublesided gear 7 and the 4thlimited step 1101 is spacing to realize relativerotating cylinder support 11 invariant position vertically.

Shown in figure 12, even havefirst driving section 1501 on the inwall oftube 15, the outer wall of sleeve double-screw bolt 14 is provided withsecond driving section 1403 and 1404, thesecond driving sections 1403, the 3rd driving section that are positioned at the 5thlimited step 1402 both sides and cooperates with first driving section 1501.Connect being synchronized with the movement betweentube 15 and the sleeve double-screw bolt 14 and cooperate realization withfirst driving section 1501 through second driving section 1403.First driving section 1501 is preferably the second axial convex tendon, andsecond driving section 1403 is preferably axial notch, and the advantage of said structure is thatfirst driving section 1501 moves axially Shi Buhui and forces in sleeve double-screw bolt 14.

Like Fig. 2, Fig. 8 and shown in Figure 14; Produce counting sound when injecting in order to make; Metering and injecting assembly also comprise: inject thetooth 8 of beating; Be arranged between the 4thlimited step 1101 of doublesided gear 7 androtating cylinder support 11 and be set in outside the sleeve double-screw bolt 14, injection is beated and is had the4th driving section 801 that cooperates with the3rd driving section 1404 of sleeve double-screw bolt 14 on the inwall oftooth 8, injection beat have on the first surface oftooth 8 cooperate with thefirst counting tooth 705 of doublesided gear 7second count tooth 802;Second spring 9 is arranged on injection and beats between the 4thlimited step 1101 of second surface androtating cylinder support 11 of tooth 8.The4th driving section 801 is preferably the second axial convex tendon, and the3rd driving section 1404 is preferably axial notch.

The patient is when injection; Sleeve double-screw bolt 14 rotates with connectingtube 15 synchronously; The3rd driving section 1404 of sleeve double-screw bolt 14 cooperates with the4th driving section 801, makes that injecting thetooth 8 of beating rotates, like this; Under the effect ofsecond spring 9, the second counting tooth of injecting ontooth 8 first surfaces of beating 802 is countedtooth 705 generation counting sound with first of doublesided gear 7.

Preferably, thefirst counting tooth 705, second is countedtooth 802 and is anti-reverse ratchet.Inject and beattooth 8 under the tension force ofsecond spring 9, keep meshing, inject thetooth 8 of beating simultaneously and can only beat clockwise with thefirst counting tooth 705 of doublesided gear 7.

Like Fig. 7 and shown in Figure 14, thefirst counting tooth 705, second is countedtooth 802 and is axial tooth, has the first axial grooving between adjacent two teeth of thefirst counting tooth 705, has the second axial grooving between adjacent two teeth of thesecond counting tooth 802.

Shown in figure 12;Connect tube 15 and be the ladder tubular; Comprisefirst tube 15a of portion of company that is positioned at first end and thesecond tube 15b of portion of company that is positioned at second end; First connect thetube 15a of portion internal diameter greater than second connect thetube 15b of portion internal diameter, first connect thetube 15a of portion inwall havefirst driving section 1501, even have the 3rd ontins 15 the ladder end face andcount tooth 1503.

Preferably, like Fig. 8, Figure 16, Figure 19 and shown in Figure 22, rotating operation portion comprises:hopper 16 and encapsulate ring 17.Hopper 16 is set in 11 outer and the middle part ofhopper 16 and the second end clampings of pushrod rotating cylinder 12 of rotating cylinder support, has addend effect tooth spline fixture block 1601 on the inwall ofhopper 16;Encapsulate ring 17 is set in outside thehopper 16 and withhopper 16 and rotates synchronously, has the 6thlimited step 1701 of the end face that radially protrudes inhopper 16 on the inwall of encapsulate ring 17.Preferably,hopper 16 is circumferentially with metering scale near the outer surface upper edge of encapsulate ring 17.As possible implementation, also canhopper 16 and encapsulatering 17 be designed to integrative-structure.As concrete embodiment, shown in figure 16, theconcave indentation 1203 ofhopper 16 through card post 1602 andwedge 1603 and second end of pushrod rotating cylinder 12 andbayonet socket 1204 the match middle part ofincompatible completion hopper 16 and the second end clamping of push rod rotating cylinder 12.Realize being connected ofhoppers 16 and encapsulatering 17 through the fixture block onhopper 16 outer walls 1604, and then realize both being synchronized with the movement.

Like Fig. 8 and shown in Figure 17; Press operating part is acaudal peduncle 21;Caudal peduncle 21 comprises plate-like press section 2101 and a plurality of connectingportions 2102 that are connected with plate-like press section 2101, and connectingportion 2102 cooperates the connectingportion 2102 ofcaudal peduncle 21 spacing inencapsulate ring 17 with the 6thlimited step 1701 ofencapsulate ring 17.

To shown in Figure 19, produce counting sound like Fig. 8, Figure 18 when regulating dosage in order to make, metering and injecting assembly also comprise: addend effect tooth 19, add subtrahend beat gear 18 and the 3rd spring 20.Shown in figure 18, addend effect tooth 19 has the draw-in groove 1901 that cooperates with addend effect tooth spline fixture block 1601, and addend effect tooth 19 has the 4th counting tooth 1902 towards the surface of push rod rotating cylinder 12, have the through hole of dodging; Shown in figure 19; Adding the subtrahend gear 18 of beating is arranged in the hopper 16; Add the subtrahend gear 18 of beating and be the ladder tubular; Comprise be positioned at the 3rd of first end connect the tube 18a of portion be positioned at second end the 4th connect the tube 18b of portion, the 3rd connect the tube 18a of portion internal diameter greater than the 4th internal diameter of the tube 18b of portion even, the 4th even the tube 18b of portion pass the through hole of dodging of addend effect tooth 19; The 3rd connect the tube 18a of portion end face be provided with the 5th counting tooth 1801 that cooperates with the 3rd counting tooth 1503, add subtrahend beat have on the ladder end face of gear 18 with the 4th count that tooth 1902 cooperates the 6th count tooth 1802; As shown in Figure 8, the 3rd spring 20 is arranged between the plate-like press section 2101 of addend effect tooth 19 and caudal peduncle 21.Shown in figure 19, the 5th counting tooth 1801 is anti-reverse ratchet with the 6th counting tooth 1802, and the tooth that the 5th counting tooth 1801 and the 6th is counted tooth 1802 is helical teeth, and the bevel direction of helical teeth is opposite.

When regulating dosage; When addend, clockwise rotate rotating operation portion (rotateencapsulate ring 17 and then drivehopper 16 and rotate), rotate thereby drive pushrod rotating cylinder 12; Pushrod rotating cylinder 12 is through the cooperation ofspiral card article 1201 and screw-like chute 1102; Pushrod rotating cylinder 12 rotates and withdraws from rotatingcylinder support 11 gradually, retreats and then drives press operating part through first limited step, 1202 company's ofdrive tubes 15 when pushrod rotating cylinder 12 is retreated and retreat, and the displacement that connects on only having axially whentube 15 is retreated is not rotated.Addend effect tooth 19 is owing to spacingaddend effect tooth 19 and thehopper 16 of making that draw-in groove 1901 receives addend effect tooth spline fixture block 1601 rotates synchronously;Addend effect tooth 19 can drive through the cooperation of the 4th counting tooth 1902 and the6th counting tooth 1802 and addsubtrahend gear 18 rotations of beating; Add subtrahend and beat under the elastic force effect of rotation and the3rd spring 20 ofgear 18, the5th counting tooth 1801 is skidded on the3rd counting tooth 1503 and then produce counting sound.

When subtrahend; Opposite when operation and addend; Rotate counterclockwise encapsulatering 17;Addend effect tooth 19 can't drive and addbeat gear 18 of subtrahend and rotate, and under the elastic force effect of the rotation ofaddend effect tooth 19 and the3rd spring 20, the 4th counting tooth 1902 is skidded on the6th counting tooth 1802 and then produces counting sound.

See through like the metering form among Figure 21 23 and observe change in value.The3rd spring 20 time utilizes elastic force to replaceaddend effect tooth 19 or replacesaddend effect tooth 19 and add thesubtrahend gear 18 of beating at counting, and on the one hand, the other end of the3rd spring 20 is replaced the plate-like press section 2101 ofcaudal peduncle 21, can strengthen patient's feel so again.

Like Figure 12, Figure 18 and shown in Figure 19; The3rd counting tooth 1503, the 4th counting tooth 1902, the5th counting tooth 1801 and the6th counting tooth 1802 are axial tooth, have the 3rd axial grooving between adjacent two teeth of the 4th counting tooth 1902, the5th counting tooth 1801 and the6th counting tooth 1802.

Can realize counting among the embodiment of sound, the patient can presscaudal peduncle 21, andcaudal peduncle 21 application of forces are beated on thegear 18 and then can power be passed to and connect on thetube 15 adding subtrahend.

Like Fig. 1 and shown in Figure 21, pen-type injector also comprises structures such asshell 22, countingform 23,lower casing 24, pen clip 25.

Shown in figure 20, have strip buckle 201 on the second end outer wall of medicinebottle installation portion 2, as shown in Figure 4, havefirst bayonet socket 103 that cooperates with strip buckle 201 on the sidewall of fixingplug body 10.

From above description, can find out that the above embodiments of the present invention have realized following technique effect:

1) device can reuse, for the patient practices thrift.Apparatus of the present invention only need be changed the medicine bottle of medicines such as insulin, and just throw away pen after needn't accomplishing a shot.Thereby can practice thrift the expense of buying pen for the patient, also practice thrift social resources simultaneously.

2) patient can very accurately accomplish injection.This device is provided with the form count block, the injection volume the when patient can clearly know medicines such as per injection insulin through form.

3) if the patient in when injection, transfers injection volume many or transfers fewly, this device can be realized increasing progressively and successively decrease and also needn't take off medicine bottle when operate, and the patient also needn't worry when readjustment, can produce leakage, reaches the liquid medicine wasting phenomenon.

4) this device is simple to operate, and is reliable.

The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. a pen-type injector is characterized in that, comprising:

Medicine bottle installation portion (2), its first end removably is connected with syringe needle (1), and second end of said medicine bottle installation portion (2) has the installing hole that is used to install medicine bottle;

Fixing plug assembly, first end removably is connected second end of said medicine bottle installation portion (2), and said fixedly plug assembly has axially extending bore, and the inwall of said axially extending bore is provided with the push rod rotation prevention portion;

Metering and injecting assembly; Be connected with second end of said fixedly plug assembly; Said metering and injecting assembly comprise: rotating cylinder support (11), and its first end is connected with second end of said fixedly plug assembly, and said rotating cylinder support (11) is and has screw-like chute (1102) on tubular and the inwall;

Push rod rotating cylinder (12); Axially-displaceable along said rotating cylinder support (11) is arranged in the said rotating cylinder support (11) movingly; Has the spiral card article (1201) that matches with said screw-like chute (1102) on the outer wall of said push rod rotating cylinder (12); The first end end face of said push rod rotating cylinder (12) has first limited step (1202) that radially extends internally, and second distal process of said push rod rotating cylinder (12) is started from second end of said rotating cylinder support (11) and is connected with rotating operation portion;

Connect tube (15), be arranged in the said push rod rotating cylinder (12), said first end and said first limited step (1202) butt that connects tube (15), said second end that connects tube (15) is connected with press operating part;

Sleeve double-screw bolt (14) is arranged on and rotates synchronously said the company in the tube (15) and with the said tube (15) that connects, and the said relatively rotating cylinder support of said sleeve double-screw bolt (14) (11) is invariant position vertically, and said sleeve double-screw bolt (14) has tapped through hole (1401);

Push rod (4); Be located in movably vertically in the said sleeve double-screw bolt (14); And first end of said push rod (4) passes the axially extending bore of said fixedly plug assembly; Said push rod (4) outer surface has the external screw thread (401) that cooperates with said tapped through hole (1401); The outer surface of said push rod (4) has that extend and that match with said push rod rotation prevention portion vertically spline chute (402), and first end of said push rod (4) removably is connected with the push rod cup (403) that is used to promote the piston in medicine bottle (3) opening.

2. pen-type injector according to claim 1 is characterized in that, said fixedly plug assembly comprises:

Fixing plug body (10), first end removably is connected second end of said medicine bottle installation portion (2), and the inwall of said fixedly plug body (10) has second limited step (101);

Coyote hole top (5); Be arranged on movably vertically in the said fixedly plug body (10); Has the 3rd limited step (501) on the inwall on said coyote hole top (5); Have the first axial convex tendon (502) on the inwall of said the 3rd limited step (501) to form said push rod rotation prevention portion, second end on said coyote hole top (5) has first limited (503), has second limited (504) on the outer wall on said coyote hole top;

Double sided gear (7); Spacing second end at said fixedly plug body (10); Second limited (504) on said coyote hole top (5) are spacing between said double sided gear (7) and second limited step (101); The first surface (702) of said double sided gear (7) has the coyote hole top rotation prevention portion (703) that cooperates with said first limited (503), and the second surface (704) of said double sided gear (7) has the first counting tooth (705);

First spring (6) is arranged between the first surface (702) of the 3rd limited step (501) and said double sided gear (7) on said coyote hole top (5),

Wherein, the axially extending bore of said fixedly plug assembly pushes up the endoporus of (5) by said coyote hole and the endoporus of double sided gear (7) forms;

Preferably, said first limited (503) and coyote hole top rotation prevention portion (703) first axial tooth and second axial tooth for cooperatively interacting;

Preferably, have strip buckle (201) on the second end outer wall of said medicine bottle installation portion (2), have first bayonet socket (103) that cooperates with said strip buckle (201) on the sidewall of said fixedly plug body (10).

3. pen-type injector according to claim 2; It is characterized in that; Second end of said fixedly plug body (10) has first Access Division (102); Have second Access Division (701) that cooperates with said first Access Division (102) on the sidewall of said double sided gear (7), said double sided gear (7) is through spacing second end at said fixedly plug body (10) of the cooperation of said first Access Division (102) and second Access Division (701);

Preferably; Two elastic cards of said first Access Division (102) for being oppositely arranged; The inwall of said elastic card is provided with the first wedge shape buckle; Second Access Division (701) of said double sided gear (7) is the first wedge shape fixture block, and the both sides of the corresponding said first wedge shape fixture block also are provided with double sided gear spline piece (102a) on the inwall of said first Access Division (102);

Further preferably; Also be provided with rotating cylinder stand connection (104) between said two elastic cards; Said rotating cylinder stand connection (104) outer surface has the second wedge shape fixture block (104a), and first end of said rotating cylinder support (11) has second bayonet socket (1104) that cooperates with the said second wedge shape fixture block (104a).

4. pen-type injector according to claim 2; It is characterized in that; Has the 4th limited step (1101) on the inwall of said rotating cylinder support (11) near first end; Have said screw-like chute (1102) on the inwall between the 4th limited step (1101) of said rotating cylinder support (11) to second end of said rotating cylinder support (11), second end of said rotating cylinder support (11) has the 3rd Access Division (1103).

5. pen-type injector according to claim 4 is characterized in that, said metering and injecting assembly also comprise:

Lock bracket (13) is connected at second end of said rotating cylinder support (11) with the 3rd Access Division (1103) of said rotating cylinder support (11), and said lock bracket (13) is spacing in said rotating cylinder support (11) with the spiral card article (1201) of said push rod rotating cylinder (12);

Preferably; The 3rd Access Division (1103) comprises clamping opening and the 3rd bayonet socket on the sidewall of said rotating cylinder support (11) second ends, said lock bracket (13) have the card post (1301) that cooperates with said clamping opening and with the 4th wedge shape fixture block (1302) of said the 3rd bayonet fittings.

6. pen-type injector according to claim 4; It is characterized in that; Second surface (704) butt of said sleeve double-screw bolt (14) first ends and said double sided gear (7); Said sleeve double-screw bolt (14) has the 5th limited step (1402) on the lateral wall; Said the 5th limited step (1402) be positioned between the 4th limited step (1101) of said double sided gear (7) and rotating cylinder support (11) and with said the 4th limited step (1101) butt, said sleeve double-screw bolt (14) receives said double sided gear (7) and the 4th limited step (1101) is spacing to realize said relatively rotating cylinder support (11) invariant position vertically.

7. pen-type injector according to claim 6; It is characterized in that; Has first driving section (1501) on the inwall of said even tube (15); The outer wall of said sleeve double-screw bolt (14) is provided with second driving section (1403) and the 3rd driving section (1404) that are positioned at said the 5th limited step (1402) both sides, and said second driving section (1403) cooperates with said first driving section (1501).

8. pen-type injector according to claim 7 is characterized in that, said metering and injecting assembly also comprise:

Inject the tooth (8) of beating; Be arranged between the 5th limited step (1402) of said double sided gear (7) and said sleeve double-screw bolt (14) and be set in outside the said sleeve double-screw bolt (14); Said injection is beated and is had the 4th driving section (801) that cooperates with the 3rd driving section (1404) of said sleeve double-screw bolt (14) on the inwall of tooth (8), said injection beat have on the first surface of tooth (8) cooperates with the first counting tooth (705) of said double sided gear (7) second count tooth (802);

Second spring (9) is arranged on said injection and beats between the 4th limited step (1101) of second surface and said rotating cylinder support (11) of tooth (8);

Preferably, the said first counting tooth (705), the second counting tooth (802) are anti-reverse ratchet;

Preferably, first driving section (1501) and the 4th driving section (801) are the second axial convex tendon, and second driving section (1403) and the 3rd driving section (1404) are axial notch;

Preferably, the said first counting tooth (705), the second counting tooth (802) are axial tooth, have the first axial grooving between adjacent two teeth of the said first counting tooth (705), have the second axial grooving between adjacent two teeth of the second counting tooth (802).

9. pen-type injector according to claim 8; It is characterized in that; The said tube (15) that connects is the ladder tubular, comprise be positioned at first of first end connect tube portion (15a) be positioned at second end second connect tube portion (15b), said first even the internal diameter of tube portion (15a) greater than said second internal diameter of tube portion (15b) even; The inwall of the said first tube portion of company (15a) has said first driving section (1501), has the 3rd counting tooth (1503) on the ladder end face of said even tube (15).

10. pen-type injector according to claim 9 is characterized in that, said rotating operation portion comprises:

Hopper (16) is set in said rotating cylinder support (11) outer and the middle part of said hopper (16) and the second end clamping of said push rod rotating cylinder (12), has addend effect tooth spline fixture block (1601) on the inwall of said hopper (16);

Encapsulate ring (17) is set in outside the said hopper (16) and with said hopper (16) and rotates synchronously, has the 6th limited step (1701) of the end face that radially protrudes in said hopper (16) on the inwall of said encapsulate ring (17);

Preferably; Said press operating part is caudal peduncle (21); Said caudal peduncle (21) comprises plate-like press section (2101) and a plurality of connecting portions (2102) that are connected with said plate-like press section (2101), and said connecting portion (2102) cooperates the connecting portion (2102) of caudal peduncle (21) spacing in said encapsulate ring (17) with the 6th limited step (1701) of said encapsulate ring (17);

Preferably, said hopper (16) is circumferentially with metering scale near the outer surface upper edge of said encapsulate ring (17).

11. pen-type injector according to claim 10 is characterized in that, said metering and injecting assembly also comprise:

Addend effect tooth (19); Has the draw-in groove (1901) that cooperates with said addend effect tooth spline fixture block (1601); Said addend effect tooth (19) has the 4th counting tooth (1902) towards the surface of said push rod rotating cylinder (12), said addend effect tooth (19) has the through hole of dodging;

Add the subtrahend gear (18) of beating; Be arranged in the said hopper (16); The said subtrahend gear (18) of beating that adds is the ladder tubular; Comprise be positioned at the 3rd of first end connect tube portion (18a) be positioned at second end the 4th connect tube portion (18b), the said the 3rd even the internal diameter of tube portion (18a) greater than the said the 4th internal diameter of tube portion (18b) even, the said the 4th even tube portion (18b) passes the said through hole of dodging; The said the 3rd connect tube portion (18a) end face be provided with the 5th counting tooth (1801) that cooperates with said the 3rd counting tooth (1503), said add subtrahend beat have on the ladder end face of gear with the said the 4th count that tooth (1902) cooperates the 6th count tooth (1802);

The 3rd spring (20) is arranged between the plate-like press section (2101) of said addend effect tooth (19) and said caudal peduncle (21);

Preferably; The 3rd counting tooth (1503), the 4th counting tooth (1902), the 5th counting tooth (1801) and the 6th counting tooth (1802) are axial tooth, have the 3rd axial grooving between adjacent two teeth of the 4th counting tooth (1902), the 5th counting tooth (1801) and the 6th counting tooth (1802).

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