CN202459642U

CN202459642U - Button back-triggering needleless injector

Info

Publication number: CN202459642U
Application number: CN2012201162692U
Authority: CN
Inventors: 冯志刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-26
Filing date: 2012-03-26
Publication date: 2012-10-03
Anticipated expiration: 2022-03-26

Abstract

The utility model discloses a button back-triggering needleless injector which comprises a nozzle device and a trigger device, wherein the nozzle device consists of an injection connecting piece, a plunger, a nozzle piston, a nozzle and an injection orifice arranged at the front end of the nozzle; and the trigger device consists of a central cylinder outer rubber shell, a central cylinder, a central shaft and a main force spring, and is characterized by further comprising a release device formed by a main cylinder outer rubber shell, a main cylinder, a release button, a locking element, a cylindrical shaft sleeve, a shaft sleeve cover, a tension element, a shaft sleeve, a rolling ball, a trigger spring and a release spring. The button back-triggering needleless injector can safely, reliably and rapidly convey the prefilled liquid medicine into the body of a patient, completely avoids the phenomenon of early triggering, and has the advantages of being simple and convenient in operation, is fewer in parts, simple in structure, low in requirement for parts, small in size, low in cost and suitable for batch production.

Description

Percussion formula needleless injector behind the button

Technical field

This utility model relates to medical apparatus and instruments, especially relates to a kind of subcutaneous injection such as insulin or growth hormone of being used for, and after improving the button that percussion lock is a purpose, pulls the trigger the formula needleless injector.

Background technology

Needleless injector is that a kind of external power supply (spring load formula or pneumatic type) of passing through is given the pressurization of liquid medicine; And make the liquid drug of predetermined close pass through very thin micropore with the form of high-voltage high-speed; Transdermal enters into a kind of medicament delivery device in the subcutis.Liquid drug can directly not penetrate human or animal's skin through syringe needle and enter in the body.

Along with the development of pharmaceuticals industry, produced many biological preparation quasi drugss, the characteristics of these medicines are that injection volume is little, often injection (like type patient insulin injection voluntarily).There is the syringe of pin to bring the fear of pin and the pain of acupuncture to user.Needleless injector then can be avoided these problems effectively, has solved the drawback that needs with syringe needle, and needleless injector can also make injectable drug more be tending towards disperseing simultaneously, helps the absorption of medicine and reduces hypodermic infringement, avoids forming and hardens.

At present, though the design of the percussion lock of some needleless injectors can prevent the too early and unsafe percussion of syringe, inconvenient operation, and the phenomenon of percussion too early still can take place, and can't avoid fully.

Summary of the invention

The purpose of this utility model be to provide a kind of can the liquid drug of prepackage is safe and reliable, be transported in patient's body apace, can avoid percussion formula needleless injector behind the phenomenon of percussion too early, the button easy and simple to handle fully.

The purpose of this utility model is achieved in that

Percussion formula needleless injector behind a kind of button; Comprise spray nozzle device and percussion lock; Spray nozzle device is made up of the injection orifice of injection connector, plunger, nozzle piston, nozzle and spray nozzle front end; The injection connector is used for fixing the rearward end of nozzle, and the plunger that front end is with the nozzle piston is installed in the injecting cavity of nozzle, and percussion lock is made up of the outer glue shell of central cylinder, central cylinder, central shaft and main force's spring; The outer glue valve jacket of central cylinder is fixed on the outside of central cylinder; The outer wall of injection connector is fixed on the front inner wall of central cylinder, is provided with central shaft and the main force's spring that is enclosed within the central shaft outer wall at the intravital postmedian of central tube, is provided with the central shaft flange of an amplification at the front end of central shaft; The front end of main force's spring withstands on the central shaft flange; On the front inner wall of central cylinder, the rear of injection connector is provided with and props up the central shaft flange to prevent that central shaft from breaking through head forward, bulge loop before the annular central cylinder, confirms the preceding abut of main force's spring, bulge loop was fixed in the middle of the front end of central shaft before the rear end of non-movable piston was passed central cylinder backward; On the outer wall of the rear end of central shaft, be processed with annular locking slot; Characteristic is: also comprise the releasing device of being made up of the outer glue shell of main cylinder, main cylinder, release-push, locking element, cartridge sleeve, axle sleeve lid, tension element, axle sleeve, ball, trigger spring and retracting spring, the outer glue valve jacket of main cylinder is adorned the outside that is fixed on main cylinder, and the middle rear end in main cylinder is provided with can active release-push; Release-push is the button of a cross section for " T " shape; Be made up of discoid button and locking release column, on the lateral wall, middle rear end of locking release column, being processed with the anglec of rotation is the helicla flute of 90 degree, is processed with the locking release column groove to open front at the front end of locking release column; In locking release column groove, be placed with touch pole and inverse-T-shaped shake-up projection; Locking element is made up of a loop configuration that is connected as a single entity, an outthrust and two extensions, on the inwall of loop configuration, is fixed with the outthrust that extends radially inwardly and match with helicla flute, on the outer wall of loop configuration, is fixed with two radially outer extensions; The rear end of cartridge sleeve extend in the main cylinder and with main cylinder and is fixed together; The rear end outer wall of central cylinder is sleeved on the front inner wall of main cylinder; The front end outer wall of cartridge sleeve is connected through the rear end inwall of screw thread and central cylinder; Cartridge sleeve is separated into three back cylinder chambers that communicate, middle cylinder chamber and preceding cylinder chamber by the axle sleeve dividing plate and forms; In the diameter of cylinder chamber less than the diameter of back cylinder chamber and preceding cylinder chamber, the front end of locking release column passes in the back cylinder chamber that loop configuration extend into the intravital cartridge sleeve of central tube, in the cylinder chamber of back, is provided with the retracting spring that is enclosed within locking release column front end; The front end of retracting spring is against on the axle sleeve dividing plate; The rear end of retracting spring is entangled the front end of locking release column and is against on the loop configuration, and the projection transverse arm that touches projection blocks the front opening of locking release column groove, and can from the back cylinder chamber, cylinder chamber enter into before the rear end of cylinder chamber touching tension element; On the outer wall of the back cylinder chamber of central cylinder, be processed with four and be the extension embedded groove that 90 degree are arranged and are convenient to let two extensions of locking element embed; The tension element that is processed with to the trigger spring groove of open front is positioned in the preceding cylinder chamber of cartridge sleeve; The rear end of trigger spring withstands on the rear end of trigger spring groove; The front end sleeve of trigger spring is on the round bottom rear end of the axle sleeve lid of " ten " font; The step flange that the step axle sleeve is diminished by external diameter successively, step connecting cylinder and step shaft sleeve constitute; The step axle sleeve makes step axle sleeve and cartridge sleeve be fixed together through the front end of cylinder chamber before being threaded into of step connecting cylinder outer wall, and the step flange is between the rear end of front end and main force's spring of cartridge sleeve; The step flange stops a little after as main force's spring; The step shaft sleeve extend into the axle sleeve lid flange that props up in the trigger spring groove on the axle sleeve lid center side wall, and the cylindricality front end of axle sleeve lid slides and is tucked into the rear end of step axle sleeve intracavity, the rear end of central shaft enter into behind the step axle sleeve intracavity can with touching in the middle of the cylindricality front end of axle sleeve lid; On the sidewall of step shaft sleeve, be processed with several and be used to the ball hole placing ball, evenly arrange; Ball outwards moves through this ball hole and snaps in the locking slot of central shaft rear end, and the pinning center axle is processed with the cylinder neck of holding ball from the outside at the front end of the preceding cylinder chamber of cartridge sleeve.

Outthrust and two extensions are on the straight line of same footpath.

The sidewall of glue shell is marked with the scale value that can show the liquid stream dosage information that sucks injecting cavity outside central cylinder.

The present invention has following advantage:

1, the direction of releasing force is consistent with injection force, and it is more convenient to make in injection, and user only need be exerted oneself along a direction, and in injection process, can guarantee more stable.

2, retracting spring can guarantee that release-push must be the continuous compression state, makes release-push remain on unlocked position, has so just eliminated because of counter-pressure acts on to cause like too early percussion on the nozzle or make syringe fall the appearance that waits abnormal conditions on the ground.As long as because eliminated the pressure on the button, syringe will return back to locked position.

Therefore, the utlity model has can be safe and reliable with the liquid drug of prepackage, be transported in patient's body apace, can avoid fully percussion too early phenomenon, easy and simple to handle, parts are few, simple in structure, part require low, volume is little, with low cost, be fit to the advantage produced in batches.

Description of drawings

Fig. 1 is the cross-sectional schematic of this utility model under original state;

Fig. 2 is the schematic perspective view of release-push, locking element, cartridge sleeve;

Fig. 3 is the vertical view of locking element;

Fig. 4 is the enlarged drawing of A part among Fig. 1.

The specific embodiment

Below in conjunction with embodiment and contrast accompanying drawing this utility model is done further explain.

Percussion formula needleless injector behind a kind of button; Comprise spray nozzle device 10 and percussion lock 20; Spray nozzle device 10 is made up of the injection orifice 12 of injection connector 15, plunger 14, nozzle piston 11, nozzle 13 and nozzle 13 front ends; Injection connector 15 is used for fixing the rearward end of nozzle 13; The plunger 14 that front end is with nozzle piston 11 is installed in the injecting cavity 16 of nozzle 13, and percussion lock 20 is made up of the outer glue shell 21 of central cylinder, central cylinder 22, central shaft 23 and main force's spring 24, and outer glue shell 21 suits of central cylinder are fixed on the outside of central cylinder 22; The outer wall of injection connector 15 is fixed on the front inner wall of central cylinder 22; Postmedian in central cylinder 22 is provided with central shaft 23 and the main force's spring 24 that is enclosed within central shaft 23 outer walls, is provided with the central shaft flange 26 of an amplification at the front end of central shaft 23, and the front end of main force's spring 24 withstands on the central shaft flange 26; On the front inner wall of central cylinder 22, the rear of injection connector 15 is provided with and props up central shaft flange 26 to prevent that central shaft 23 from breaking through head forward, bulge loop 27 before the annular central cylinder; Confirm the preceding abut of main force's spring 24, bulge loop 27 was fixed in the middle of the front end of central shaft 23 before the rear end of plunger 14 was passed central cylinder backward, on the outer wall of the rear end of central shaft 23, was processed with annular locking slot 25; Releasing device 30 is made up of the outer glue shell 41 of main cylinder, main cylinder 42, release-push 43, locking element 44, cartridge sleeve 31, axle sleeve lid 32, tension element 33, step axle sleeve 34, ball 35, trigger spring 36 and retracting spring 37; Outer glue shell 51 suits of main cylinder are fixed on the outside of main cylinder 52; Middle rear end in main cylinder 52 is provided with can active release-push 53; Release-push 43 is cross section buttons for " T " shape; Constitute by discoid button 431 and locking release column 432; On the lateral wall, middle rear end of locking release column 432, being processed with the anglec of rotation is the helicla flute 436 of 90 degree; Front end in locking release column 432 is processed with the locking release column groove 433 to open front; In locking release column groove 433, be placed with touch pole 434 and inverse-T-shaped shake-up projection 435, the front opening of locking release column groove 433 is blocked in the both sides of touching projection 435, and locking element 44 is made up of a loop configuration that is connected as a single entity 441, an outthrust 443 and two extensions 442; On the inwall of loop configuration 441, be fixed with the outthrust 443 that extends radially inwardly and match, on the outer wall of loop configuration 441, be fixed with two radially outer extensions 442 with helicla flute 436; The rear end of cartridge sleeve 31 extend in the main cylinder 42 and with main cylinder 42 and is fixed together; The rear end outer wall of central cylinder 22 is sleeved on the front inner wall of main cylinder 42; The front end outer wall of cartridge sleeve 31 is connected through the rear end inwall of screw thread and central cylinder 22; Cartridge sleeve 31 is separated into three back cylinder chambers 311 that communicate, middle cylinder chamber 312 and preceding cylinder chamber 313 by axle sleeve dividing plate 314 and forms; The diameter of middle cylinder chamber 312 is less than the diameter of back cylinder chamber 311 and preceding cylinder chamber 313; The front end of locking release column 432 passes in the back cylinder chamber 311 that loop configuration 441 extend into the cartridge sleeve 31 in the central cylinder 22; In the cylinder chamber 311 of back, be provided with the retracting spring 37 that is enclosed within locking release column 432 front ends, the front end of retracting spring 37 is against on the axle sleeve dividing plate 314, and the rear end of retracting spring 37 is entangled the front end of locking release column 432 and is against on the loop configuration 441; The projection transverse arm that touches projection 435 blocks the front opening of locking release column groove 433, and can from back cylinder chamber 311, cylinder chamber 312 enter into before the rear end of cylinder chamber 313 touching tension elements 33; On the outer wall of the back cylinder chamber 311 of central cylinder 22, be processed with four and be the extension embedded groove 315 that 90 degree are arranged and are convenient to let two extensions 442 of locking element 44 embed; The tension element 33 that is processed with to the trigger spring groove 331 of open front is positioned in the preceding cylinder chamber 313 of cartridge sleeve 31; The rear end of trigger spring 36 withstands on the rear end of trigger spring groove 331; The front end sleeve of trigger spring 36 is on the round bottom rear end 323 of the axle sleeve lid 32 of " ten " font; The step flange 343 that step axle sleeve 34 is diminished by external diameter successively, step connecting cylinder 342 and step shaft sleeve 341 constitute; Step axle sleeve 34 is through the front end that is threaded into preceding cylinder chamber 313 of step connecting cylinder 342 outer walls; Make step axle sleeve 34 and cartridge sleeve 31 be fixed together; And step flange 343 is between the rear end of front end and main force's spring 24 of cartridge sleeve 31, and step flange 343 stops a little after as main force's spring 24, and step shaft sleeve 341 extend into and props up axle sleeve in the trigger spring groove 331 and cover the axle sleeve lid flange 321 on 32 center side walls; The cylindricality front end 322 of axle sleeve lid 32 slides and is tucked into the rear end in the step axle sleeve chamber 344; After the rear end of central shaft 23 enters in the step axle sleeve chamber 344 can with axle sleeve cover 32 cylindricality front end 322 in the middle of touching, on the sidewall of step shaft sleeve 341, be processed with several and be used to the ball hole 345 placing ball 35, evenly arrange, ball 35 outwards moves through this ball hole 345 and snaps in the locking slot 25 of central shaft 23 rear ends; Pinning center axle 23 is processed with the cylinder neck 316 of holding ball 35 from the outside at the front end of the preceding cylinder chamber 313 of cartridge sleeve 31.

Outthrust and two extensions are on the straight line of same footpath.

The sidewall of glue shell 21 is marked with the scale value that can show the liquid stream dosage information that sucks injecting cavity outside central cylinder.

Operation principle:

In product operation, at first main force's spring 24 will be ready to injection.This is to reach with central cylinder 22 through glue shell 21 outside the central cylinder of outer glue shell 41 of rotation main cylinder and main cylinder 42 relative predetermined directions.Rotatablely moving of when rear end is seen (for example clockwise from) main cylinder 42; Drive radially rotation to cylinder axle sleeve 31 and advance to pin main cylinder 42; Because of cylinder axle sleeve 31 is to be threaded io central cylinder 22, such rotation can make cylinder axle sleeve 31 move towards the front end of central cylinder 22.Cylinder axle sleeve 31 also promotes tension element 33, trigger spring 36, axle sleeve lid 32, step axle sleeve 34 and ball 35 towards central shaft 23 reaches, and central shaft 23 is relatively-stationary with spray nozzle device 10.Move (the central shaft flange 26 that is central shaft 23) owing to stopping main force's spring 24 of point (being the step flange 343 of step axle sleeve 34) towards front end behind main force's spring 24, main force's spring 24 is compressed with this motion.When compression continued, central shaft 23 began impeller-hub upper shield 32 backwards, in compression trigger spring 36, pushed tension element 33 backward; In this process, ball 35 is squeezed and can radially outward moves, when the locking slot 25 of central shaft 23 rear ends arrives the position of ball 35; Ball 35 can move inward automatically, falls in the locking slot 25 pinning center axle 23; Central shaft 23 and tension element 33 stop motions, the state that therefore makes main force's spring 24 keep compression and prepared.Syringe can be initiated in this stage.Main cylinder 42 rotations and corresponding central cylinder 22 are starting stage and predetermined direction opposite (being counterclockwise when the rear end is seen).

Main cylinder 42 is owing to this rotation is moved backward, and central shaft 23 also moves backward, and pins tension elements 33 through ball 35 entering trigger spring grooves 331.The plunger 14 of spray nozzle device 10 also moves backward and increases injecting cavity 16, and when injecting cavity 16 enlarged, liquid stream extracted or enters the injecting cavity 16 from fluid source.

When step axle sleeve 34 rotating band disorder of internal organs heart cylindrical shells 22, show dose information is like 0～50 dosage unit.

Central shaft 23 just can move forward under the effect of main force's spring 24 fast.

When press release-push 43, when injecting love dart forward, the inward flange of helicla flute 436 and ledge 443 transfer the axial force of axially-movable or helicla flute 436 to and the angle of axially-movable is mated.Release-push 43 is the back reach because button is depressed, and ledge 443 will slide along the inner edge of helicla flute 436, therefore causes the respective change of the angle position of ledge 443, also makes locking element 44 rotations move to lockset position of coupler.At lockset position of coupler, the cylindrical sleeve 31 that ledge 443 promotions of locking element 44 are retreated, release-push 43 further also is advanced to extension 442 extension embedded groove 315 places of back cylinder chamber 311 forward like this; Touch pole 434 extruding of locking release column 432 touch projection 435; Make and touch the back cylinder chamber 311 that projection 435 extend into the cartridge sleeve 31 in the central cylinder 22, the roof pressure tension element 33 forward, tension part 33 reaches; So trigger spring 36 is roof pressure axle sleeve lid 32 forward; Axle sleeve lid 32 radially outward pushes ball 35, makes ball 35 break away from locking slots 25, central shaft 23 rapid movement forward under the brute force of main force's spring 24 promotes; Central shaft 23 just with pushing injection orifice 12 before the plunger 14 to, sprays medicinal liquid from injection orifice 12.

Claims

1. pull the trigger the formula needleless injector behind a button; Comprise spray nozzle device and percussion lock; Spray nozzle device is made up of the injection orifice of injection connector, plunger, nozzle piston, nozzle and spray nozzle front end; The injection connector is used for fixing the rearward end of nozzle, and the plunger that front end is with the nozzle piston is installed in the injecting cavity of nozzle, and percussion lock is made up of the outer glue shell of central cylinder, central cylinder, central shaft and main force's spring; The outer glue valve jacket dress of central cylinder is fixed on the outside of central cylinder; The outer wall of injection connector is fixed on the front inner wall of central cylinder, is provided with central shaft and the main force's spring that is enclosed within the central shaft outer wall at the intravital postmedian of central tube, is provided with the central shaft flange of an amplification at the front end of central shaft; The front end of main force's spring withstands on the central shaft flange; On the front inner wall of central cylinder, the rear of injection connector is provided with and props up the central shaft flange to prevent that central shaft from breaking through head forward, bulge loop before the annular central cylinder, confirms the preceding abut of main force's spring, bulge loop was fixed in the middle of the front end of central shaft before the rear end of non-movable piston was passed central cylinder backward; On the outer wall of the rear end of central shaft, be processed with annular locking slot; It is characterized in that: also comprise the releasing device of being made up of the outer glue shell of main cylinder, main cylinder, release-push, locking element, cartridge sleeve, axle sleeve lid, tension element, axle sleeve, ball, trigger spring and retracting spring, the outer glue valve jacket of main cylinder is adorned the outside that is fixed on main cylinder, and the middle rear end in main cylinder is provided with can active release-push; Release-push is the button of a cross section for " T " shape; Be made up of discoid button and locking release column, on the lateral wall, middle rear end of locking release column, being processed with the anglec of rotation is the helicla flute of 90 degree, is processed with the locking release column groove to open front at the front end of locking release column; In locking release column groove, be placed with touch pole and inverse-T-shaped shake-up projection; Locking element is made up of a loop configuration that is connected as a single entity, an outthrust and two extensions, on the inwall of loop configuration, is fixed with the outthrust that extends radially inwardly and match with helicla flute, on the outer wall of loop configuration, is fixed with two radially outer extensions; The rear end of cartridge sleeve extend in the main cylinder and with main cylinder and is fixed together; The rear end outer wall of central cylinder is sleeved on the front inner wall of main cylinder; The front end outer wall of cartridge sleeve is connected through the rear end inwall of screw thread and central cylinder; Cartridge sleeve is separated into three back cylinder chambers that communicate, middle cylinder chamber and preceding cylinder chamber by the axle sleeve dividing plate and forms; In the diameter of cylinder chamber less than the diameter of back cylinder chamber and preceding cylinder chamber, the front end of locking release column passes in the back cylinder chamber that loop configuration extend into the intravital cartridge sleeve of central tube, in the cylinder chamber of back, is provided with the retracting spring that is enclosed within locking release column front end; The front end of retracting spring is against on the axle sleeve dividing plate; The rear end of retracting spring is entangled the front end of locking release column and is against on the loop configuration, and the projection transverse arm that touches projection blocks the front opening of locking release column groove, and can from the back cylinder chamber, cylinder chamber enter into before the rear end of cylinder chamber touching tension element; On the outer wall of the back cylinder chamber of central cylinder, be processed with four and be the extension embedded groove that 90 degree are arranged and are convenient to let two extensions of locking element embed; The tension element that is processed with to the trigger spring groove of open front is positioned in the preceding cylinder chamber of cartridge sleeve; The rear end of trigger spring withstands on the rear end of trigger spring groove; The front end sleeve of trigger spring is on the round bottom rear end of the axle sleeve lid of " ten " font; The step flange that the step axle sleeve is diminished by external diameter successively, step connecting cylinder and step shaft sleeve constitute; The step axle sleeve makes step axle sleeve and cartridge sleeve be fixed together through the front end of cylinder chamber before being threaded into of step connecting cylinder outer wall, and the step flange is between the rear end of front end and main force's spring of cartridge sleeve; The step flange stops a little after as main force's spring; The step shaft sleeve extend into the axle sleeve lid flange that props up in the trigger spring groove on the axle sleeve lid center side wall, and the cylindricality front end of axle sleeve lid slides and is tucked into the rear end of step axle sleeve intracavity, the rear end of central shaft enter into behind the step axle sleeve intracavity can with touching in the middle of the cylindricality front end of axle sleeve lid; On the sidewall of step shaft sleeve, be processed with several and be used to the ball hole placing ball, evenly arrange; Ball outwards moves through this ball hole and snaps in the locking slot of central shaft rear end, and the pinning center axle is processed with the cylinder neck of holding ball from the outside at the front end of the preceding cylinder chamber of cartridge sleeve.

2. percussion formula needleless injector behind the button according to claim 1, it is characterized in that: outthrust and two extensions are on the straight line of same footpath.

3. percussion formula needleless injector behind the button according to claim 2, it is characterized in that: the sidewall of glue shell is marked with the scale value that can show the liquid stream dosage information that sucks injecting cavity outside central cylinder.