CN102512733B

CN102512733B - Disposable needleless injector

Info

Publication number: CN102512733B
Application number: CN 201110407021
Authority: CN
Inventors: 冯志刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-09
Filing date: 2011-12-09
Publication date: 2013-03-27
Anticipated expiration: 2031-12-09
Also published as: CN102512733A

Abstract

The invention discloses a disposable needleless injector which comprises a power device formed by a rear cover, a sleeve cover, a sleeve, a sliding bushing, a bushing spring, a main shaft operating rod, a main shaft, a firing spring, a pusher rod and a plunger; a liquid medicament device formed by an ampoule holder, an ampoule and a protective cover; and a protective clamp. The power device is a pre-compressed spring system which can provide enough power to push a liquid medicament in the ampoule to be jetted out of a nozzle with a high speed, the liquid medicament device is a container prefilled with the liquid medicament, the protective clamp can prevent the power device from being triggered by mistake, the main shaft is locked by a ball to further protect safety, and the diameter of the nozzle is minimized to prevent leakage of the liquid medicament. Accordingly, the invention has the advantages that: the disposable needleless injector can inject the prefilled liquid medicament into the body of a patient safely, reliably and rapidly, needs less parts, has a simple structure, low requirements for parts, a small size and a low cost, and is convenient to operate and suitable for mass production and single use.

Description

Disposable needleless injector

Technical field

The present invention relates to medical apparatus and instruments, especially relate to a kind of disposable needleless injector that is used for subcutaneous injection such as insulin or growth hormone.

Background technology

Needleless injector is that a kind of external power supply (spring load formula or pneumatic type) of passing through is to 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 by syringe needle and enter in the body.

Along with the development of pharmaceuticals industry, many biological preparation quasi drugss that produced cattle, the characteristics of these medicines are that injection volume is little, often injection (such as patients with NIDDM 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, is conducive to the absorption of medicine and reduces hypodermic infringement, avoids forming scleroma.

At present, all be a bit can reusable needleless injector on the market, these can reusable needleless injector exist the problem that needs user to draw voluntarily medicine from medicine bottle.Draw the process more complicated of medicine, in this process, not only needing has good training to user, may bring the risk of medicine pollution simultaneously.And these are can reusable needleless injector relatively loaded down with trivial details in operation, and product parts is many, the structural design relative complex of linkage, and part processing precision requires high, and production cost is high.

Summary of the invention

The object of the present invention is to provide a kind of can the liquid drug of prepackage is safe and reliable, be transported in the patient body rapidly, parts are few, simple in structure, part require low, volume is little, with low cost, easy and simple to handle, be fit to batch production, disposable needleless injector, it has solved the band water problem of getting it filled preferably, the process of having avoided user to get it filled voluntarily.

The object of the present invention is achieved like this:

A kind of disposable needleless injector, comprise ampoule, Bottom base of ampule and the sleeve that is fixed on the strip of Bottom base of ampule rear end, sidewall in the ampoule rear end of the equal opening in rear and front end is processed with the ampoule groove of annular, ampoule locking clamp on the Bottom base of ampule medial wall snaps in the ampoule groove, the rear end of ampoule is fixed on the centre of Bottom base of ampule, the front end of ampoule is the small nozzle of diameter, the good medicinal liquid of disposable pre-fill in ampoule, feature is: the protective cover in that front end and the outside of ampoule are provided with to cover ampoule, pollute medicine to avoid air and antibacterial to enter into ampoule from nozzle; Outer surface cover at sleeve has the socket cover that is slidingly matched with sleeve, bonnet is flexibly connected by the rear end of screw thread and socket cover, centre in bonnet is provided with the bonnet holder, the trigger cover is fixed on the inwall of sleeve rear end by locking pin, front inner wall at the trigger cover is processed with trigger cover groove, the rear end outer wall of tubular locking guiding element be processed be meshed with trigger cover groove and locking guiding element groove so that the locking guiding element moves forward and backward in the trigger cover; The rear end of slide bushings is fixed on the bonnet holder, the annular front end sleeve of slide bushings is on the inwall of the middle part of trigger cover and be and be slidingly matched, be placed with axle bush spring and main shaft stick at the slide bushings intracavity, the rear end of axle bush spring withstands on the rear end inwall in slide bushings chamber, the front end of axle bush spring withstands on the rear end of main shaft stick, the rear end of main shaft is passed locking and is entered the slide bushings intracavity behind the guiding element and fill in the horn opening on main shaft stick top, on the outer wall of rear-end of spindle, be provided with the ball of jointly being pushed down by the rear end of the front end of slide bushings and locking guiding element in the main shaft rearward recess of annular, and be provided with the ball gap that stops for ball after breaking away from the main shaft rearward recess for ball between the rear end of the front end of slide bushings and locking guiding element, the percussion spring that the outer wall cover at main shaft in being in mantle cavity middle part has compressed, the rear end of percussion spring props up locking guiding element and the common plane that consists of of trigger cover, the front end of percussion spring props up front-end of spindle, on the annular flap of pressing close to the inwall of sleeve, sidewall cover in the annular flap of front-end of spindle has so that the close-fitting main shaft seal circle of the inwall of front-end of spindle and sleeve, as if the rear end of the push rod in the sleeve chamber snap in the main shaft forward recess of front-end of spindle, the front end sleeve of the push rod in extending into ampoule has to push the plunger of medicinal liquid, and plunger and ampoule inwall are slidingly matched; On the sidewall of Bottom base of ampule, be fixed with the safety clamp that to pull in use between the front end of the rear end of protective cover and socket cover.

Protective cover is by the ampoule side cover that separates and protecgulum is threaded connection or the mode of jam consists of; be provided with the ampoule projection of annular at the front end outer wall of ampoule; be provided with the protecgulum projection that cooperates with the ampoule projection in the rear end of protecgulum, the protecgulum projection blocks the ampoule projection so that protective cover can cover ampoule.

Front end at main shaft is equipped with packing ring.

The present invention is by bonnet; socket cover; sleeve; slide bushings; the axle bush spring; the main shaft stick; main shaft; the percussion spring; the power set that push rod and plunger consist of; by Bottom base of ampule; the medicinal liquid device that ampoule and protective cover consist of and protective folder form; power set are the in advance spring systems of compression; it can produce enough power; push away from the nozzle high speed with the medicinal liquid that promotes in the ampoule; the medicinal liquid device is the container of a good medicinal liquid of pre-fill; protective folder can prevent the power set false triggering; ball blocks main shaft; play the secondary fuse effect; the diameter of nozzle is small, and medicinal liquid can not leak.Operating process: take down protective cover; the position that the direct perpendicular alignmnet of nozzle of the needleless injector of disposable pre-fill need to be injected; after pulling off safety collar; then push bonnet; bonnet is the pushing set cover immediately; slide bushings; axle bush spring and main shaft stick; main shaft; the percussion spring; push rod and plunger travel forward together; meanwhile; ball also rolls in the ball gap after breaking away from the main shaft rearward recess; so that main shaft breaks away from the constraint of ball; originally compressed percussion spring discharges; so that after main shaft breaks away from the main shaft stick, with push rod and plunger unexpected rapid movement forward, promote push rod and plunger the medicinal liquid moment in the ampoule is sprayed from nozzle.

Therefore, the present invention has can be safe and reliable with the liquid drug of prepackage, be transported in the patient body rapidly, parts are few, simple in structure, part require low, volume is little, with low cost, easy and simple to handle, be fit to batch production, disposable advantage, it has solved the band water problem of getting it filled preferably, the process of having avoided user to get it filled voluntarily.

Description of drawings

Fig. 1 is structural representation of the present invention;

Fig. 2 is separation sketch map of the present invention;

Fig. 3 is cross-sectional schematic of the present invention.

The specific embodiment

Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in further detail.

A kind of disposable needleless injector, comprise ampoule 11, Bottom base of ampule 31 and the sleeve 14 that is fixed on the strip of Bottom base of ampule 31 rear ends, sidewall in ampoule 11 rear ends of the equal opening in rear and front end is processed with the ampoule groove 10 of annular, ampoule locking clamp 30 on Bottom base of ampule 31 medial walls snaps in the ampoule groove 10, the rear end of ampoule 11 is fixed on the centre of Bottom base of ampule 31, the front end of ampoule 11 is the small nozzle of diameter 12, at the good medicinal liquid of ampoule 11 interior disposable pre-fills, protective cover 2 in that front end and the outside of ampoule 11 are provided with to cover ampoule pollutes medicine to avoid air and antibacterial to enter into ampoule 11 from nozzle 12; Outer surface cover at sleeve 14 has the socket cover 1 that is slidingly matched with sleeve 14, bonnet 6 is flexibly connected by the rear end of screw thread and socket cover 1, centre in bonnet 6 is provided with bonnet holder 16, trigger cover 21 is fixed on the inwall of sleeve 14 rear ends by locking pin 20, front inner wall at trigger cover 21 is processed with trigger cover groove 22, the rear end outer wall of tubular locking guiding element 23 be processed be meshed with trigger cover groove 22 and locking guiding element groove 33 so that locking guiding element 23 moves forward and backward in trigger cover 21; The rear end of slide bushings 17 is fixed on the bonnet holder 16, the annular front end sleeve of slide bushings 17 is on the inwall of the middle part of trigger cover 21 and be and be slidingly matched, in slide bushings chamber 15, be placed with axle bush spring 18 and main shaft stick 19, the rear end of axle bush spring 18 withstands on the rear end inwall in slide bushings chamber 15, the front end of axle bush spring 18 withstands on the rear end of main shaft stick 19, the rear end of main shaft 24 is passed locking and is entered behind the guiding element 23 in the slide bushings chamber 15 and fill in the horn opening 37 on main shaft stick 19 tops, on the outer wall of main shaft 24 rear ends, be provided with the ball 36 of jointly being pushed down by the rear end of the front end of slide bushings 17 and locking guiding element 23 in the main shaft rearward recess 34 of annular, and between the rear end of the front end of slide bushings 17 and locking guiding element 23, be provided with for ball 36 and break away from the rear ball gaps 35 that stop for ball 36 of main shaft rearward recess 34, the percussion spring 25 that the outer wall at main shaft 24 middle parts in being in mantle cavity 8 cover has compressed, the rear end of percussion spring 25 props up locking guiding element 23 and the trigger cover 21 common planes that consist of, the front end of percussion spring 25 props up main shaft 24 front ends, on the annular flap 7 of pressing close to the inwall of sleeve 14, sidewall cover in the annular flap 7 of main shaft 24 front ends has so that the close-fitting main shaft seal circle 26 of the inwall of main shaft 24 front ends and sleeve 14, the rear end of the push rod 9 in sleeve chamber 8 snaps in the main shaft forward recess 32 of main shaft 24 front ends, the front end sleeve of the push rod 9 in extending into ampoule 11 has to push the plunger 29 of medicinal liquid, and plunger 29 is slidingly matched with ampoule 11 inwalls; On the sidewall of Bottom base of ampule 31, be fixed with the safety clamp 5 that to pull in use between the front end of the rear end of protective cover 2 and socket cover 1.

Protective cover 2 is by the ampoule side cover 3 that separates and protecgulum 4 is threaded connection or the mode of jam consists of; be provided with the ampoule projection 13 of annular at the front end outer wall of ampoule 11; be provided with and the ampoule projection 13 protecgulum projections 28 that cooperate in the rear end of protecgulum 4, protecgulum projection 28 is blocked ampoule projection 13 so that protective cover 2 can cover ampoule 11.

Front end at main shaft 24 is equipped with packing ring 27.

Claims

1. disposable needleless injector, comprise ampoule, Bottom base of ampule and the sleeve that is fixed on the strip of Bottom base of ampule rear end, sidewall in the ampoule rear end of the equal opening in rear and front end is processed with the ampoule groove of annular, ampoule locking clamp on the Bottom base of ampule medial wall snaps in the ampoule groove, the rear end of ampoule is fixed on the centre of Bottom base of ampule, the front end of ampoule is the small nozzle of diameter, the good medicinal liquid of disposable pre-fill in ampoule, it is characterized in that: the protective cover in that front end and the outside of ampoule are provided with to cover ampoule, pollute medicine to avoid air and antibacterial to enter into ampoule from nozzle; Outer surface cover at sleeve has the socket cover that is slidingly matched with sleeve, bonnet is flexibly connected by the rear end of screw thread and socket cover, centre in bonnet is provided with the bonnet holder, the trigger cover is fixed on the inwall of sleeve rear end by locking pin, front inner wall at the trigger cover is processed with trigger cover groove, the rear end outer wall of tubular locking guiding element be processed be meshed with trigger cover groove and locking guiding element groove so that the locking guiding element moves forward and backward in the trigger cover; The rear end of slide bushings is fixed on the bonnet holder, the annular front end sleeve of slide bushings is on the inwall of the middle part of trigger cover and be and be slidingly matched, be placed with axle bush spring and main shaft stick at the slide bushings intracavity, the rear end of axle bush spring withstands on the rear end inwall in slide bushings chamber, the front end of axle bush spring withstands on the rear end of main shaft stick, the rear end of main shaft is passed locking and is entered the slide bushings intracavity behind the guiding element and fill in the horn opening on main shaft stick top, on the outer wall of rear-end of spindle, be provided with the ball of jointly being pushed down by the rear end of the front end of slide bushings and locking guiding element in the main shaft rearward recess of annular, and be provided with the ball gap that stops for ball after breaking away from the main shaft rearward recess for ball between the rear end of the front end of slide bushings and locking guiding element, the percussion spring that the outer wall at main shaft in being in mantle cavity middle part has compressed, the rear end of percussion spring props up locking guiding element and the common plane that consists of of trigger cover, the front end of percussion spring props up front-end of spindle, on the annular flap of pressing close to the inwall of sleeve, sidewall cover in the annular flap of front-end of spindle has so that the close-fitting main shaft seal circle of the inwall of front-end of spindle and sleeve, the rear end of the push rod in the sleeve chamber snaps in the main shaft forward recess of front-end of spindle, the front end sleeve of the push rod in extending into ampoule has to push the plunger of medicinal liquid, and plunger and ampoule inwall are slidingly matched; On the sidewall of Bottom base of ampule, be fixed with the safety clamp that to pull in use between the front end of the rear end of protective cover and socket cover.

2. disposable needleless injector according to claim 1; it is characterized in that: protective cover is by the ampoule side cover that separates and protecgulum is threaded connection or the mode of jam consists of; be provided with the ampoule projection of annular at the front end outer wall of ampoule; be provided with the protecgulum projection that cooperates with the ampoule projection in the rear end of protecgulum, the protecgulum projection blocks the ampoule projection so that protective cover can cover ampoule.

3. disposable needleless injector according to claim 2, it is characterized in that: the front end at main shaft is equipped with packing ring.