CN103816589A - Large-volume multi-head needleless injector - Google Patents

The invention relates to a needleless injector for subcutaneous injection, in particular to a large-volume multi-head needleless injector, which comprises a push rod (1), an ampule (2) and a piston (3), wherein the piston (3) is arranged at the front end of the push rod (1), the push rod (1) is arranged inside the ampule (2), the end surface of the ampule (2) is provided with 3 to 8 regularly ranged micro spray holes (4), and the micro spray holes (4) adopt structures with connected conical transition passages (6) and cylindrical spray heads (7). The needleless injector has the advantages that the structure is simple, the design is reasonable, the use is convenient, the practicability is high, the fast and safe injection of large dosage of medicine can be ensured, the pain and the uncomfortable feeling of patients during the injection can be effectively relieved, the speed of organisms for absorbing the medicine liquid is accelerated, and the medicine liquid effect taking time is shortened.

Large capacity bull needleless injector

Technical field

The present invention relates to one for hypodermic needleless injector, particularly a kind of large capacity bull needleless injector.

Background technology

Needleless injector, exactly in the time carrying out drug injection not by syringe needle, concerning using the patient of traditional needle injection, medicinal liquid enters and subcutaneously evenly scatters, increase drug absorption rate, long-time injection skin has been difficult for hardening, thereby has solved traditional injection because syringe needle thrusts the series of problems that body brings, as: pain, hemorrhage, infection, tissue injury, mental pressure etc.; Meanwhile, in more disperse of in-house distribution, be conducive to the absorption of medicine through the medicine of Needleless injection, medicinal liquid absorbs more complete, and the bioavailability of medicine is improved, and blood drug level peak value can arrive in advance.What present needleless injector all adopted is that single head is injected, but there is following shortcoming, the one,, single head needleless injector can only be carried out low dose of injection, generally dosage below 0.5ml, if dosage is too large, at short notice (several seconds about zero point) can cause human body pain and discomfort after injecting and exceeding certain dosage in subrange; The 2nd,, limit the scope of application of needleless injector, be only applicable to the injection of small dose drug.

Summary of the invention

According to above deficiency of the prior art, the problem to be solved in the present invention is: provide one can guarantee that heavy dose of medicine fast and safely injects, ease the pain and uncomfortable, shorten the large capacity bull needleless injector of medicinal liquid onset time.

The technical solution adopted for the present invention to solve the technical problems is:

Described large capacity bull needleless injector, comprise push rod, ampoule and piston, piston is arranged on the front end of push rod, push rod is arranged on ampoule inside, the end face of ampoule arranges 3-8 regularly arranged miniature spray orifice, the structure that described miniature spray orifice adopts tapering transition passage and cylindrical shower nozzle to join.

Described large capacity bull needleless injector can alleviate Principle of Pain and discomfort in the time of heavy dose of drug injection, improves the speed of body absorption medicinal liquid simultaneously, has shortened the time of medicinal liquid onset, reasonable in design, simple in structure, safe.

Preferred further, the base diameter of tapering transition passage is less than the diameter of cylindrical access road, and the top diameter of tapering transition passage is identical with the diameter of cylindrical shower nozzle.Assurance jet is good, prevents that shower nozzle from stopping up.

Preferred further, cylindrical access road is that arc is connected with tapering transition passage, and tapering transition passage is that arc is connected with cylindrical shower nozzle.Improve jet effect.

Preferred further, the cylindrical shower nozzle diameter of miniature spray orifice is 0.1mm-0.5mm.Reduce water consumption.

Preferred further, the angle of throat of miniature spray orifice is 10-20 °.Jet stability is good.

Preferred further, the draw ratio of miniature spray orifice is 0.03-0.05.There is the energy conversion efficiency of good pressure energy and jet velocity.

Preferred further, the material of push rod and ampoule adopts polycarbonate.Heat-resisting ageing-resisting, solvent resistance.

The beneficial effect that the present invention has is:

Described large capacity bull needleless injector arranges 3-8 regularly arranged micro-hole at ampoule injection end face, guarantee the fast and safely injection of heavy dose of medicine, because the ampoule that is arranged on that injection spray orifice relatively disperses is injected end face, patient's pain and sense of discomfort when injection, are effectively alleviated, simultaneously, bull injection can improve the speed of body absorption medicinal liquid, has shortened the time of medicinal liquid onset.The present invention is simple in structure, reasonable in design, easy to use, has very strong practicality.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is one of structural representation of ampoule end face of the present invention;

Fig. 3 be ampoule end face of the present invention structural representation two;

Fig. 4 be ampoule end face of the present invention structural representation three;

Fig. 5 be ampoule end face of the present invention structural representation four;

Fig. 6 be ampoule end face of the present invention structural representation five;

Fig. 7 be ampoule end face of the present invention structural representation six;

Fig. 8 is the structural representation of miniature spray orifice of the present invention;

Wherein, 1, push rod; 2, ampoule; 3, piston; 4, miniature spray orifice; 5, cylindrical access road; 6, tapering transition passage; 7, cylindrical shower nozzle.

The specific embodiment

Below in conjunction with accompanying drawing, embodiments of the invention are described further:

Principle of the present invention is:

Ampoule and the push rod of described large capacity bull needleless injector all adopt macromolecular material to utilize plastic mould injection mo(u)lding, after push rod and piston set are installed, then with ampoule composition one.In use, utilize high pressure excitation apparatus that push rod and piston forward express delivery are advanced extract the medicinal liquid of appropriate dose by the miniature spray orifice of ampoule section after, make the flow through miniature spray orifice of ampoule end face of medicinal liquid form soft pin transdermal and be expelled in subcutaneous tissue.The present invention is simple in structure, reasonable in design, easy to use, practical, can guarantee the fast and safely injection of heavy dose of medicine, the pain while effectively alleviating patient injection and sense of discomfort, and raising body absorbs the speed of medicinal liquid, shortens medicinal liquid onset time.