CN102512733A

CN102512733A - Disposable needleless injector

Info

Publication number: CN102512733A
Application number: CN2011104070211A
Authority: CN
Inventors: 冯志刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-09
Filing date: 2011-12-09
Publication date: 2012-06-27
Anticipated expiration: 2031-12-09
Also published as: CN102512733B

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 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, many biological preparation quasi drugss that produced cattle, 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, all be a bit can reusable needleless injector on the market, these can reusable needleless injector exist the problem that needs user from medicine bottle, to draw medicine voluntarily.Draw the process more complicated of medicine, in this process, not only need good training be arranged, may bring the risk of medicine pollution simultaneously to user.And these are can reusable needleless injector loaded down with trivial details relatively 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 patient's body apace, parts are few, simple in structure, part require low, volume is little, with low cost, easy and simple to handle, be fit to produce in batches, disposable needleless injector; It has solved the problem of the band water of getting it filled, the process of having avoided user to get it filled voluntarily preferably.

The objective of the invention is to realize like this:

A kind of disposable needleless injector; Comprise ampoule, Bottom base of ampule and be fixed on the sleeve of the strip of Bottom base of ampule rear end; On the sidewall of the ampoule rear end of the equal opening in two ends, front and back, be processed with annular ampoule groove, the ampoule locking mounting board on the Bottom base of ampule medial wall is gone 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 preparatory fill in ampoule, characteristic is: the front end and the outside at ampoule are provided with the protective cover that is used for covering ampoule, pollute medicine to avoid air and antibacterial to enter into ampoule from nozzle; Be with the socket cover that is slidingly matched with sleeve in telescopic outside; Bonnet flexibly connects through the rear end of screw thread and socket cover; Centre in bonnet is provided with the bonnet holder, and the trigger cover is fixed on through locking pin on the inwall of sleeve rear end, on the front inner wall of trigger cover, is processed with trigger cover groove; On the outer wall of the rear end of tubular locking guiding element, be processed be meshed with trigger cover groove and locking guiding element groove, make the locking guiding element in the trigger cover, move forward and backward; 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 and is got into the slide bushings intracavity behind the locking guiding element and fill in the vertical horn opening of main shaft stick; On the outer wall of rear-end of spindle, be provided with in the annular main shaft rearward recess by the rear end ball jointly pushed down of the front end of slide bushings, and be provided with the ball gap that supplies ball to stop after supplying ball to break away from the main shaft rearward recess between the rear end of the front end of slide bushings and locking guiding element, be with the percussion spring that has been compressed on the outer wall at the main shaft middle part in being in mantle cavity with the locking guiding element; The rear end of percussion spring props up locking guiding element and the common plane that constitutes of trigger cover; On the annular flap that the front end of percussion spring props up front-end of spindle, press close to telescopic inwall, make front-end of spindle and the close-fitting main shaft seal circle of telescopic inwall, the rear end of the push rod in the sleeve chamber snap in the main shaft forward recess of front-end of spindle to seem being with on the sidewall of the annular flap of front-end of spindle; The front end sleeve of the push rod in extending into ampoule has the plunger that is used for pushing 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 by isolating ampoule side cover and protecgulum through being threaded or the mode of jam constitutes; Front end outer wall at ampoule is provided with annular ampoule convexity; Be provided with and the protruding protecgulum convexity that cooperates of ampoule in the rear end of protecgulum, the protecgulum convexity is blocked the ampoule convexity makes protective cover can cover ampoule.

Front end at main shaft is equipped with packing ring.

The power set that the present invention is made up of bonnet, socket cover, sleeve, slide bushings, axle bush spring, main shaft stick, main shaft, percussion spring, push rod and plunger, the medicinal liquid device that is made up of Bottom base of ampule, ampoule and protective cover and protection folder are formed; Power set are the spring systems of compression in advance, and it can produce enough power, pushes 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 preparatory fill; The protection folder can prevent the power set false triggering, and ball blocks main shaft, plays the secondary safety effect; The diameter of nozzle is small, and medicinal liquid can not leak.Operating process: take down protective cover, with the position that the direct perpendicular alignmnet of nozzle of the needleless injector of disposable preparatory fill need be injected, pull off safety collar after; Push bonnet then, bonnet promotes socket cover, slide bushings, axle bush spring and main shaft stick, main shaft, percussion spring, push rod and plunger immediately and travels forward together, meanwhile; Ball also rolls in the ball gap after breaking away from the main shaft rearward recess; Make main shaft break away from the constraint of ball, originally compressed percussion spring discharges, make that main shaft breaks away from the main shaft stick after; With push rod and plunger rapid movement suddenly 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 patient's body apace, parts are few, simple in structure, part require low, volume is little, with low cost, easy and simple to handle, be fit to produce in batches, disposable advantage; It has solved the problem of the band water of getting it filled, the process of having avoided user to get it filled voluntarily preferably.

Description of drawings

Fig. 1 is a structural representation of the present invention;

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

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

The specific embodiment

Below in conjunction with embodiment and contrast accompanying drawing the present invention is done further explain.

A kind of disposable needleless injector; Comprise ampoule 11, Bottom base of ampule 31 and be fixed on the sleeve 14 of the strip of Bottom base of ampule 31 rear ends; On the sidewall of ampoule 11 rear ends of the equal opening in two ends, front and back, be processed with annular ampoule groove 10, the ampoule locking folder 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; The good medicinal liquid of disposable preparatory fill in ampoule 11 is provided with the protective cover 2 that is used for covering ampoule in the front end and the outside of ampoule 11, pollutes medicine to avoid air and antibacterial to enter into ampoule 11 from nozzle 12; Be with the socket cover 1 that is slidingly matched with sleeve 14 in the outside of sleeve 14; Bonnet 6 flexibly connects through 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 through locking pin 20; On the front inner wall of trigger cover 21, be processed with trigger cover groove 22, on the outer wall of the rear end of tubular locking guiding element 23, be processed be meshed with trigger cover groove 22 and locking guiding element groove 33, make locking guiding element 23 in trigger cover 21, move forward and backward; 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 in the entering slide bushings chamber, locking guiding element 23 back 15 and is filled in the main shaft stick 19 vertical horn openings 37; On the outer wall of main shaft 24 rear ends, be provided with the ball of being pushed down jointly by the front end of slide bushings 17 and the rear end of locking guiding element 23 36 in the annular main shaft rearward recess 34; And between the rear end of the front end of slide bushings 17 and locking guiding element 23, be provided with and supply ball 36 to break away from the ball gap 35 that main shaft rearward recess 34 backs supply balls 36 to stop; Be with the percussion spring 25 that has been compressed on the outer wall at main shaft 24 middle parts in being in mantle cavity 8, the rear end of percussion spring 25 props up locking guiding element 23 and the trigger cover 21 common planes that constitute, on the annular flap 7 that the front end of percussion spring 25 props up main shaft 24 front ends, press close to the inwall of sleeve 14; On the sidewall of the annular flap 7 of main shaft 24 front ends, be with and make the close-fitting main shaft seal circle 26 of 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, and the front end sleeve of the push rod 9 in extending into ampoule 11 has the plunger 29 that is used for pushing 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 by isolating ampoule side cover 3 and protecgulum 4 through being threaded or the mode of jam constitutes; Front end outer wall at ampoule 11 is provided with annular ampoule protruding 13; Be provided with the protecgulum convexity 28 that cooperates with ampoule protruding 13 in the rear end of protecgulum 4, protecgulum protruding 28 blocks ampoule protruding 13 makes 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 be fixed on the sleeve of the strip of Bottom base of ampule rear end; On the sidewall of the ampoule rear end of the equal opening in two ends, front and back, be processed with annular ampoule groove, the ampoule locking mounting board on the Bottom base of ampule medial wall is gone 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 preparatory fill in ampoule is characterized in that: the front end and the outside at ampoule are provided with the protective cover that is used for covering ampoule, pollute medicine to avoid air and antibacterial to enter into ampoule from nozzle; Be with the socket cover that is slidingly matched with sleeve in telescopic outside; Bonnet flexibly connects through the rear end of screw thread and socket cover; Centre in bonnet is provided with the bonnet holder, and the trigger cover is fixed on through locking pin on the inwall of sleeve rear end, on the front inner wall of trigger cover, is processed with trigger cover groove; On the outer wall of the rear end of tubular locking guiding element, be processed be meshed with trigger cover groove and locking guiding element groove, make the locking guiding element in the trigger cover, move forward and backward; 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 and is got into the slide bushings intracavity behind the locking guiding element and fill in the vertical horn opening of main shaft stick, on the outer wall of rear-end of spindle, is provided with the ball of being pushed down jointly by the front end of slide bushings and the rear end of locking guiding element in the annular main shaft rearward recess, and is being provided with the ball gap that supplies ball to stop after supplying ball to break away from the main shaft rearward recess between the rear end of the front end of slide bushings and locking guiding element; The percussion spring that has been compressed is arranged on the outer wall at main shaft in being in mantle cavity middle part; The rear end of percussion spring props up the common plane that constitutes of locking guiding element and trigger cover, and the front end of pulling the trigger spring props up front-end of spindle, on the annular flap of pressing close to telescopic inwall; On the sidewall of the annular flap of front-end of spindle, be with and make front-end of spindle and the close-fitting main shaft seal circle of telescopic inwall; The rear end of the push rod in the sleeve chamber snaps in the main shaft forward recess of front-end of spindle, and the front end sleeve of the push rod in extending into ampoule has the plunger that is used for pushing 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 by isolating ampoule side cover and protecgulum through being threaded or the mode of jam constitutes; Front end outer wall at ampoule is provided with annular ampoule convexity; Be provided with and the protruding protecgulum convexity that cooperates of ampoule in the rear end of protecgulum, the protecgulum convexity is blocked the ampoule convexity makes protective cover can cover ampoule.

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