SE204828C1

SE204828C1 -

Info

Publication number: SE204828C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: R R Stephens Foreliggande uppfinning haul& sig till anordningar for injicering av en vdtskestrale, dvs. injektionssprutor av nalfri typ, sora kunna injicera vatska subkutant pa grund av formagan has den fina, hastiga •strale, vilken de Ore avsedda att utstinda, att punktera och genomtranga hinnor. Inventor: R R Stephens The present invention relates to devices for injecting a fluid jet, i.e. syringe-free syringes are capable of injecting fluid subcutaneously due to the shape of the fine, rapid jet, which they are intended to excite, puncture and penetrate membranes.

Talrika injektionsapparater ha redan foreslagits, men pa det hela taget aro de tunga och skrymmande samt innehalla energiackumulatorer, varigenom injektionen kan startles genom mekanisk utlOsning av en kolv, som forst utsattes Thr .star tryckkraft. Det har i praktiken visat sig, att dessa apparater i allmanhet rekylera i olamplig grad forutom att de Oro alltfor dyra och olianterliga for dentalt bruk. Numerous injection devices have already been proposed, but on the whole they are heavy and bulky and contain energy accumulators, whereby the injection can be started by mechanical release of a piston, which was first subjected to Thr .star compressive force. It has been found in practice that these devices generally recoil to an inappropriate degree except that they are too expensive and unsuitable for dental use.

Ett andamal med uppfinningen Or att astadkomma en latt nalfri injektionsspruta eller stralinjektor, som icke kraver en energiackumulator men samtidigt behaller Virdelen med en hog utgangshastighet hos stralen, som Or nadvandig for slemhinnans punktering. Ett annat andamal Or att astadkomma en nalfri injektionsspruta, som är bekvam att manovrera fOr tandlakare, som ofta maste injicera vid stallen i patientens mun, soul. Ora svaratkomliga for att joke saga oatkomliga med for niirvarande anvanda nalfria injektorer. Vidare kunna med en anordning enligt uppfinningen successivadoser ,sprutas ut fran &am-ma patron. Slutligen är att marka, att en nalfri injektor med svag rekyl astadkommes enligt uppfinningen. An object of the invention is to provide a light squeegee-free syringe or jet injector which does not require an energy accumulator but at the same time retains the Advantage with a high output velocity of the jet, which is common for puncture of the mucosa. Another goal is to provide a squeegee-free syringe, which is convenient to maneuver for dentists, who often have to inject at the stables in the patient's mouth, soul. Ora responsible for making joke saga inaccessible with currently using nalfria injectors. Furthermore, with a device according to the invention successive doses can be sprayed out of the cartridge. Finally, it should be noted that a teddy-free injector with a weak recoil is provided according to the invention.

Uppfinningen avser en nalfri injektor med en munstycksdel, som her en fin straloppning, en med munstycket kommunicerande behallare for injektionsvatska och en mindre kolv for att driva vatska fran behallaren .genom munstycket, varvid denna forsta kolv Or f8r enad med en kolv med betydligt storre tvarsektionsarea i en tryckmedelspaverkad cylinder far clirekt OverfOring av tryckkraft fran den storre till den mindre kolven, varjamte cylindern har en inloppsdel for fluidum, vilken kan forbindas med en yttre tryckmedelskalla via alt bojligt ror. The invention relates to a needle-free injector with a nozzle part, as here a fine jet opening, a container for injection liquid communicating with the nozzle and a smaller piston for driving liquid from the container through the nozzle, this first piston being fused with a piston with a considerably larger cross-sectional area. in a pressure medium actuated cylinder there is a direct transfer of pressure force from the larger to the smaller piston, and the cylinder has an inlet part for fluid, which can be connected to an external pressure medium head via a flexible tube.

Vid anvOndning forbindes den nalfria in-. jektionssprutan med en tryckmedelskalla, vilken Or forenad med en anordning for plOtslig tillforsel av detta tryckmedel. Det har vi-sat sig lampligast att anvanda en tryckgaskalla sasam drivkalla och mata gasen genont en ventil Died snappverkan for att astadkoinma den n.advandiga plOtsliga rorelsen. Den enklaste konstruktionen erhalles genom att injektionssprutans cylinder Or anordnad f Or pneumatisk drift, eftersom tryckgasen (exempelvis Tuft) kan matas genom den med Klappverkan arbetande ventilen direkt till injektionssprutan. Emellertid kan man vinna en kraftigare tryckkraft, en inera kompakt injektor eller ett lagre gastryck genom anyandning av en sarskild pneumatisk cylinder, solo medelst en hydraulisk Overforingsanordning Or forbunden med injektionssprutan, vars cylinder dOrvid Or en hydraulisk cylinder. Denna anordning underlattar ocksa inkopplingen av en havstangsforbindelse mellan den pneumatiska cylindern och den hydrauliska OverfOringsanordningen, vilket ger en mekanisk for del. In use, connect the needle-free input. the syringe with a pressure medium head, which is combined with a device for the sudden supply of this pressure medium. It has been found most convenient to use a pressurized gas cold as well as the propulsion cold and feed the gas through a valve Died snap action to effect the now-present sudden movement. The simplest construction is obtained by arranging the syringe cylinder Or for pneumatic operation, since the pressurized gas (for example Tuft) can be fed through the valve acting with Klappverkan directly to the syringe. However, a more powerful compressive force, an inert compact injector or a lower gas pressure can be gained by inhaling a special pneumatic cylinder, solo by means of a hydraulic transfer device Or connected to the syringe, the cylinder of which is a hydraulic cylinder. This device also facilitates the connection of a sea rod connection between the pneumatic cylinder and the hydraulic transfer device, which provides a mechanical advantage.

Fran en synpunkt sett bestar uppfinningen i en nalfri injektionsspruta, sasoni ovan angivits, vid vilken den tryckmedelspaverkade cylindern Or avsedd for pneumatisk drift och Or forbunden med en med suappverkan arbetande ventil for tryckgastillforsel fran en lamplig Fran en annan synpunkt sett be star uppfin- 2 ningen i en nalfri injektionsspruta, sasom ovan angivits„ vid: vilken den tryckrn.edelspaverkade cylindern är avsedd for hydraulisk drift och medelst en hydraulisk dverforingseller lankanordning är forbunden med en kolv, som paverkas av en pneumatisk tryckkolv vilken är kopplad Over en med snappverkan arbetande ventil for tryckgastillforsel Iran. en lamplig kalla. From one point of view, the invention consists in a needle-free syringe, sasoni stated above, in which the pressure medium-operated cylinder Or intended for pneumatic operation and Or connected to a suction-operated valve for pressurized gas supply from a suitable From another point of view, the invention 2 in a needle-free syringe, as indicated above, "in which the pressure-operated cylinder is intended for hydraulic operation and is connected by means of a hydraulic cross-feed or hose assembly to a piston which is actuated by a pneumatic pressure piston which is connected over a snap-operated valve for pressurized gas supply Iran. a light cold.

Genom att man slipper energiackumulatorer (t. ex. hopskjutna skruvfjadrar eller pneumatiska cylindrar, sorn maste fyllas med gas under utomordentligt hOgt tryck), blir apparaten mindre invecklad, lattare och billigare oeh enklare att manovrera. Forslag firms re-den .att anvanda tryckluft for att paverka injektionskolven i en nalfri injektionsspruta, men det liar visat sig opraktiskt att endast mata tryekluft under det erforderliga h.Oga trycket till injektionskolvens motsatta and-del. Delta innebar nandigen att man maste anvan:da gas under sadana tryck, att det är omojligt att uppratth.filla ,en konstant forbin, delse mellan injektionssprutan och en kalla for gas under motsvarande tryck i en tandlakarpraktik. Genom injektionssprutans konstruktion enligt uppfinningen blir det na8jligt att anvanda gas med mycket lagre tryck, exempelvis 14-21 kp/cm2injektions- sprutans cylinder är pneumatiskt driven) .eller exempelvis 1,75-3,5 .kp/ent2 (da inj ektionssprutans cylinder är hydrauliskt driven), under vilka forhallanden det icke ails innebar nagot problem att anvanda latta och bojliga fOrbindelseror. By avoiding energy accumulators (eg pushed together coil springs or pneumatic cylinders, which must be filled with gas under extremely high pressure), the device becomes less complicated, lighter and cheaper and easier to maneuver. Suggestions have already been made to use compressed air to actuate the syringe in a needle-free syringe, but it has proved impractical to supply only compressed air below the required pressure to the opposite proportion of the syringe. Delta meant that gas had to be used under such pressures, that it was impossible to maintain, a constant connection between the syringe and a cold gas under corresponding pressure in a dental practice. Due to the construction of the syringe according to the invention, it becomes convenient to use gas with much lower pressure, for example 14-21 kp / cm2. The cylinder of the syringe is pneumatically driven). hydraulically driven), under which conditions it did not ails any problem to use light and flexible connections.

Del är allmant kant, aft det ar viktigt att astadkomma en mycket stor utgangshastighet has vatskan. For delta andamal ha talrika, mer eller mindre invecklade anordningar fOreslagits for inbyggnad i nalfria injektionssprutor. Ett viktigt drag hos uppfinningen Or att derma viktiga effekt kan nas utan nagon sarskild anordning dad& i injektionssprutan, genom att man hell enkelt anvander en med snappverkan arbetande vantil for tillforsel av tryckgas till den pneum.atiska cylindern. Aven am denna ventil (ifraga am en pneurnatisk cylinder vid nalfria injektionssprutor) kan anbringas pa cylindern, dkar detta endast injektionssprutans vikt, varfor det generellt sett Or lampligt att montern ventilen flagon annanstans och medelst bojliga slangar fOrbinda den med cylindern. Det Or uppseendevackande, att gas under tryck av .endast 14-21 kp/cm2 skall kunna genomstromma meterlanga strackor av rOr med exempelvis endast 4,8 ram borrning och fersedda med motsvarande tunna vaggar och dna. kunna overfora en .sa krattig st8t till respektive kolv, som kravs far att alstra den slemhinne- och vavnadsgenomtrangande stralen. Part is generally edge, because it is important to achieve a very high output speed has the liquid. For delta andamal, numerous, more or less complex devices have been proposed for installation in needle-free syringes. An important feature of the invention is that this important effect can be achieved without any special device in the syringe, by simply using a snap-acting vane for supplying pressurized gas to the pneumatic cylinder. Even if this valve (except for a pneumatic cylinder for needleless syringes) can be fitted to the cylinder, this only covers the weight of the syringe, so it is generally advisable to mount the valve flake elsewhere and by means of flexible hoses connect it to the cylinder. It is striking that gas under pressure of only 14-21 kp / cm2 should be able to flow through meter-long stretches of pipes with, for example, only 4.8 frames of bore and fitted with correspondingly thin cradles and DNA. be able to transfer such a strong impact to the respective piston, which is required to produce the mucosa and tissue penetrating beam.

I allmanhet oppnas den med snappverkan arbetande ventilen med hjalpkraft. Den kan exempelvis oppnas pneumatiskt eller med fjaderanordningar, som kunna utlosas av en utlosningsanordning, vilken i sin tur kan paverkas genom fjarrkontroll, exempelvis pa elektrisk vag, medelst en mikrostromstallare, som Or monterad pa sjalva injektionssprutan, eller medelst en manoverventil i en pneumatisk krets. In general, the snap-acting valve is opened with auxiliary force. It can be opened, for example, pneumatically or with spring devices, which can be released by a release device, which in turn can be actuated by remote control, for example on an electric scale, by means of a microstream controller mounted on the syringe itself, or by a control valve in a pneumatic circuit.

Del har hittills i allmanhet ansetts -viktigt, att den fina Oppningen for stralen i munstycket ligger alldeles intill behMlaren for injektionsvatskan. For dentalt bruk, dar injektionsstallet ofta Or svaratkomligt, Or det, sasom redan namnts, i manga fall svart fOr att icke saga omajligt att na detta stalle med en injektionsapparat, som utforts enligt nagot kant fOrslag, varvid respektive munstycke Or belaget vid eller skjuter obetydligt ut fran anden av apparatens omfangsrika huvuddel. Enligt uppfinningen Or daremot munstycket, I vilket den .fina oppningen for stralen Or upptagen, monterat vid anden av ett bojt forlangningsrOr, som leder fran en hallare for injektionsvatskebehallaren. Del Or i detta sammanhang att marka, att, Oven omen fin strildppning angivits i det fOregaende, inlet hindrar anordnandet av ytterligare straloppningar. Trots Oppningens lage pa flera centimeters avstand fran vatskebehallaren bar det visat sig, att den .erforderliga hoga utgangshastigheten hos stralen ,fortfarande kan uppnas vid anvandning av sO. laga gastryck slam. 14 kp/ cm= resp. 2,8 kp/cm2 med ett fOrlangningsrOr eller borrhal, som icke Or storre On det som anvandes i en vanlig kapsylgenomforingsnal, t. ex. 1,6 mm. So far, it has generally been considered important that the fine opening for the jet in the nozzle be located right next to the container for the injection liquid. For dental use, where the injection stall is often unresponsive, or it, as already mentioned, is in many cases black so as not to say impossible to reach this stall with an injection device, which is made according to some edge proposal, whereby each nozzle is coated at or shoots insignificantly out of the spirit of the bulky main body of the apparatus. According to the invention, on the other hand, the nozzle, in which the fine opening for the jet Or is accommodated, is mounted at the end of a bent extension tube, which leads from a holder for the injection water container. Part Or in this context to mark, that, Although fine jet dipstick stated in the foregoing, inlet prevents the provision of further jet bursts. Despite the opening of the opening at a distance of several centimeters from the liquid container, it was found that the required high initial velocity of the jet can still be achieved when using sO. fix gas pressure sludge. 14 kp / cm = resp. 2.8 kp / cm2 with an extension pipe or borehole, which is not larger than that used in a standard cylinder feed-through needle, e.g. 1.6 mm.

Den. enkla mekanism, som behovs for foreliggande nalfria injektionsspruta, kan 'au fdrenas med en anordning for att kunna utfora flera injektioner i foljd ur samma vatskefyllning. Salunda kan man anordna sa att namnda behallare for injektionsvatskebehallaren, .exempelvis medelst enIskruvmekanism, kan dragas bort fran den pneumatiska eller hydrauliska kolven. I forening med slaglangdsbegransande organ far kolven kan man harigenora mata ut en hegransad dos fran vatskebehallaren, da hallaren Or aterdragen. En kalibrerad skala kan anordnas for att visa den dos, som motsvarar hallarens olika lagen. The. Simple mechanism required for the present needle-free syringe can be provided with a device to perform multiple injections in succession from the same fluid filling. Thus, it can be arranged that the said container for the injection liquid container, for example by means of a screw mechanism, can be pulled away from the pneumatic or hydraulic piston. In conjunction with the stroke limiting means of the piston, a high-dose dose can be dispensed from the water container, as the holder is retracted. A calibrated scale can be arranged to show the dose, which corresponds to the different laws of the holder.

Vid en annan anordning kunna namnda hallare och den pneumatiska 'eller hydrauliska kolven aterigen yam inbardes forskjutbara i axiell riktning, lampligen medelst en skruvmekanism, men i detta fall Oro slaglangdsbegransande organ for injektionskolven anord- 3 nade aft rora sig tillsammans med hallaren, varigenom injektionskolvens slaglangd forkortas alit efter hallarens f8rskjutning i cylinderns riktning. For att undvika en storre fri rorelse hos injektionskolven vid utlosningen av en injektion, som eventuellt kan fororsaka en Overforing till injektionsmunstycket av ett olarnpligt hart slag, kan sammansattningen av injektionskolv oar drivkolv i hada fallen begransas till storre eller mindre langd efter behov alit efter relativfiirskjutningen av hallaren for att Ulla injektionskolven i slagoverforande lage. Injekitionskolven kan salunda utforas i tva delar, av vilka en ,skruvas in i den andra och delarna hindras rotera tillsammans med vatskebehallaren resp. den pneumatiska cylinderskruvmekanismen, eftersom de sistnamnda delarna ha samma stigning som injektionskolvens skruv. Eftersom clet icke galler overforing av vridkraft, behoys ingen invecklad kilkoppling for detta andamal. In another device the said holder and the pneumatic or hydraulic piston can again be displaceable in the axial direction, suitably by means of a screw mechanism, but in this case the stroke limiting means for the injection piston are arranged to rotate together with the holder, whereby the stroke of the injection piston shortened alit after the displacement of the holder in the direction of the cylinder. In order to avoid a greater free movement of the injection piston during the release of an injection, which may possibly cause a transfer to the injection nozzle of an unintentionally hard kind, the composition of the injection piston and drive piston may in some cases be limited to greater or lesser length as needed after the relative displacement of the hall to Ulla the injection flask in impact-transferring layer. The injection plunger can thus be made in two parts, one of which is screwed into the other and the parts are prevented from rotating together with the liquid container resp. the pneumatic cylinder screw mechanism, since the latter parts have the same pitch as the screw of the injection piston. Since clet does not require transmission of torque, no complicated wedge coupling is needed for this purpose.

Uttrycket »hallare anvandes i vid bemarkelse och kan Sven avse en i och for sig vatsketat inneslutning. Denna hallare Sr utford sã att den med snav passning kan upptaga en vanlig cylindrisk glaskapsel med gummilock vid ena anden och gmrunipropp vid den andra anden, varvid gummilocket perforeras medelst en nal, som stracker sig frail munstycket eller ett fOrlangningsror pa detta, da kapseln monterats pa. vatskehallaren. Det har visat sig, att den plotsliga Overforingen av ,clet erforderliga hoga trycket i praktiken icke medfor brott pa glaskapseln. The term »hallare was used in a broad sense and Sven can refer to a per se watertight enclosure. This holder is so challenged that it can accommodate with a narrow fit an ordinary cylindrical glass capsule with a rubber cap at one end and a rubber stopper at the other end, the rubber cap being perforated by means of a needle extending from the nozzle or an extension tube thereon, when the cap is mounted on . vatskehallaren. It has been found that the sudden transfer of the required high pressure does not in practice break the glass capsule.

Uppfinningen beskrives narmare i det 181- jancle med hanvisning till hifogade ritningar. The invention is described in more detail in the 181- jancle with reference to the accompanying drawings.

Pd ritningarna visar fig. 1 en langdsektion av en injektionsspruta enligt. uppfinningen med en pneumatisk cylinder, fig. 2 en planvy av a,nordningen i fig. 1, fi.g. 3 en langthettion av en annan form av injektionsspruta med en hydraulisk cylinder och fig. 4 en schematisk anordning, som anger hur injektionssprutan i fig. 3 arbetar. In the drawings, Fig. 1 shows a longitudinal section of a syringe according to. the invention with a pneumatic cylinder, Fig. 2 a plan view of a, the northing in Fig. 1, fig. Fig. 3 shows a longitudinal section of another form of syringe with a hydraulic cylinder and Fig. 4 shows a schematic device indicating how the syringe in Fig. 3 works.

Injektionssprutan i fig. 1 och 2 bestar av en pneumatisk cylinder 1 med en anslutning 2 for ett bojligt ror, som leder till en med snappverkan arbetande gasventil (icke visad). I praktiken kan denna ventil forbindas via en reduktionsventil, som ger ett tryck av 14-21 kp/cm2, till en hogtrycksgasbomb. Cylindern Sr vid ena anden tillsluten medelst en propp 3 och vid den andra anden medelst en forlangningshylsa 4 pa en hallare 5 for en injektionsvitskebehallare eller dylikt. Den sistnamnda Sr utformad fOr att passa mot en glaspatron 6 innehallande injektionsvatska 7. Glaspatronen Sr vid ena anden tillsluten medelst en clastisk propp 8 och vid den andra anden me- deist ett elastiskt lock 9 samt Mlles I lage av en slutmutter 10, som passar Over vatskehallaren och fixerar ett forlangningsror 11 med relativt fin borrning ledande till ett munstycke 12, som Sr utfort med en fin straloppning 13. Lampliga storlekar pa denna oppning aro kanda for fackmannen. De kunna vara i starleksordningen nhgra hundradels millimeter. En. punkteringsnal 14, som är monterad i forlangningsroret 11, Sr avsedd att punktera locket 9 yid injektorns hopsattning. The syringe in Figs. 1 and 2 consists of a pneumatic cylinder 1 with a connection 2 for a flexible tube, which leads to a gas valve operating with a snap action (not shown). In practice, this valve can be connected via a reduction valve, which gives a pressure of 14-21 kp / cm2, to a high-pressure gas bomb. The cylinder Sr is closed at one end by means of a plug 3 and at the other end by means of an extension sleeve 4 on a holder 5 for an injection vial holder or the like. The latter Sr is designed to fit a glass cartridge 6 containing solution for injection 7. The glass cartridge Sr is closed at one end by means of a plastic stopper 8 and at the other end by means of an elastic lid 9 and Mlles I made by an end nut 10, which fits Over the sink holder and fixes an extension tube 11 with a relatively fine bore leading to a nozzle 12, which is made with a fine jet opening 13. Lamp sizes of this opening are known to the person skilled in the art. They can be in the order of magnitude a few hundredths of a millimeter. One. puncturing needle 14, which is mounted in the extension tube 11, is intended to puncture the lid 9 during assembly of the injector.

En pneumatisk kolv 15, som är forenad med en returfja.der 16, upptages i cylindern. 1 och Sr fast vid en injektionskolv 17, som ratt inriktad av en styryta 18 utformad cylindern 1, och av en styrande del 19, utformad i vatskehallarens forlangningshylsa 4. Injektionskolven Sr en trappkolv och har vid framkanten 20, dar den anligger mot proppen 8, flera ganger, t. ex. 10, min.dre tvarsektion.sarea an kolven 15. Harigenom uppnas ett tryck i storleksordningen 140-210 kp/cm2 medelst ett gastryck av endast 14 21 kp/ cm2. A pneumatic piston 15, which is combined with a return spring 16, is received in the cylinder. 1 and Sr attached to an injection piston 17, which is directed by a guide surface 18 formed by the cylinder 1, and by a guide part 19, formed in the extension sleeve 4 of the washbasin. several times, e.g. 10, min. Lower cross-sectional area of the piston 15. A pressure of the order of 140-210 kp / cm2 is thereby obtained by means of a gas pressure of only 14 21 kp / cm2.

KoIvens slaglangd begransas, genom att en sned ansats 21 pa kolven .samyerkar med en motsvarande sned ansats 22 i cylindern 1. En hylsa 22', som Sr monterad pa en krage 23 kring hallaren 5, uppbar en fjadrande tunga, sorn Sr anordnad att finna sate i ett langsghende spar 25 i cylinderns 1 framre del. Detta ingrepp tjanar till att bestamma laget Mr hallarens holy i farhallande till den pneumatiska cylindern, och genom utskruvning av hallaren kan en begransad dos vatska utmatas frau patronen 6, eftersom den sistnaranda kommer att dragas hart fran injektionskolven 17. The stroke of the piston is limited by the fact that an oblique shoulder 21 on the piston coincides with a corresponding oblique shoulder 22 in the cylinder 1. A sleeve 22 ', which is mounted on a collar 23 around the holder 5, carried a resilient tongue, which is arranged to be sate in a longitudinal groove 25 in the front part of the cylinder 1. This procedure serves to determine the team Mr hallarens holy in relation to the pneumatic cylinder, and by unscrewing the hallar a limited dose of liquid can be discharged from the cartridge 6, as the latter spirit will be drawn hard from the injection piston 17.

F8r att drivkolven och injektionskolven icke skola kunna rora sig fritt, da hallaren 5 forskjutes pa beskrivet satt, kan en gangf8rbindning 26 anordnas mellan inj ektionskolyens framre och bakre delar, varvid dessa de-. harhindras rotera tillsammans med vatskehallaren resp. cylindern, exempelvis av ett utsprang eller spar eller en kilkoppling yid lagena 18 och 19. Genom att utfora gangforbindningen 25 med samma stigning som gangforbindningen mellan vatskebehallaren och cylindern, ham raj ektionskolven hallas i stort sett anliggande mot proppen 8. In order that the drive piston and the injection piston should not be able to move freely when the holder 5 is displaced in the manner described, a gangway connection 26 can be arranged between the front and rear parts of the injection coil, these de-. are prevented from rotating together with the water cooler resp. the cylinder, for example by a projection or spar or a wedge coupling yid the layers 18 and 19. By making the passage connection 25 with the same pitch as the passage connection between the water tank container and the cylinder, the action piston is held substantially abutting against the plug 8.

Vid en modifikation, vid vilken ansatsdelen 21 kan utelamnas, aro anliggningsytor 27 och 28 utarbetade ph injektionskblven resp. hallarens fdrlangning 4. I detta fall kan den frau patronen 6 utmatade dosen minskas genom hallarens inskruvning i riktning mot cylindern, dvs. i motsatt riktning mot den, som kravs vid den just beskrivna utforingsformen, varvid kolvens langd minskas genom samma rorelse ph grund av gangforbindningen 26. 4 Sasom visas i fig. 2 kan en skala 29 anbringas pa den pneumatiska eylindern for att visa den mot hylsans 22 lage svarande doseringen. Mo.jligheten att dna' utmata en del av innehallet 7 gOr att successiva (loser kunna utmatas Iran samma patron. In the case of a modification in which the shoulder part 21 can be omitted, abutment surfaces 27 and 28 are prepared by the injection jaws resp. extension of the holder 4. In this case, the dose discharged from the cartridge 6 can be reduced by screwing the holder in the direction of the cylinder, i.e. in the opposite direction to that required in the embodiment just described, the length of the piston being reduced by the same movement due to the gangway connection 26. As shown in Fig. 2, a scale 29 can be mounted on the pneumatic cylinder to point it towards the sleeve 22. make the corresponding dosage. The possibility of dna 'discharging part of the contents 7 gOr to successive (loser can be discharged Iran the same cartridge.

For pa'verkan av den med snappverkan arbetande gasventilen kan en (ieke visad) mik- rostromstallare monteras pa cylindern 1. Ha.- hindelseroren kunna besta av bOjliga plastror overdragna med flatat, mycket draghallfast garn av kontinuerliga fibrer. For the effect of the snap-acting gas valve, a (not shown) microcurrent stall can be mounted on the cylinder 1. The obstacle tubes can consist of flexible plasters coated with flat, highly draft-proof yarn of continuous fibers.

Fig. 3 och 4 visa modifikationer, varvid den pneumatiska cylindern Sr skild fran sjdlva in- jektionssprutan och en hydraulisk lankanord- ning fir inkopplad mellan dessa b'ada delar. For att vinna en viss mekanisk fordel och astadkomma fullt utnyttjande av den pneumatisha cylinderns .stora slaglangd, Sr en hay-stangskoppling dessutom anordnad. Figs. 3 and 4 show modifications, in which the pneumatic cylinder is separate from the syringe itself and a hydraulic hose device is connected between these two parts. In order to gain a certain mechanical advantage and to achieve full utilization of the large stroke of the pneumatic cylinder, a hay-rod coupling is also provided.

Sjdlva injektionssprutan liknar i stora drag den, som visas i fig. 1 och 2. Den bestar av en hydraulish cylinder 30, som har ett inlopp 31 vid sin ytterande och upptager en kolv .32. The syringe itself is broadly similar to that shown in Figures 1 and 2. It consists of a hydraulic cylinder 30 having an inlet 31 at its outer end and receiving a piston.32.

Den sistnfimnda fir forsedd med en central kolvstang 33, som straeker sig genom en styr- hylsa 34, och trycker under sprutans anvand- ning med framanden 35 direkt mot gummiproppen 36 pa en kapsel 37, som innehallar injektionsmedel. Denna kapsel, som vanligen bestar av glas, upptages i en ytterhylsa 38, vars framande uppbar ett bojt forlangnings- ror 39, som leder till ett munstycke 40 med. stralOppning 41. Denna oppning kan exempelvis vara 0,07-0,12 mm i diameter. Fran rorets inre ande stracker sig en rOrformad, koncentrisk nal 42, som bar till uppgift att punktera tatningen 43 vid kapselns 37 fram- re ande. Kolvens 32 framitslag hejdas ,av en ansats 41 vid cykirardern:s 30 inre dude, !sa. att kolvstangsanden eller kolven 35 utfOr ett for- utbestamt slag. Den fran oppningen 41 utma- tade vaskenafingden bestammes av installningen air gangfarbindningen 45 mellan en central huvuddel 46 av injektorn och en forlangning 47 framtill av cylindern 30. Medelst en slutmutter 48 ffistes hylsan 38 pa den centrala huvuddelen 46. Ju langre den sistnamnda skruvas framat pa forlangningen 47, desto mer vatska utmatas. Spar 49 frilaggas successivt av en yttre hylsdel 50, som uppbfires av den centrala huvuddelen 46, for att visa den mangd, som skall utmatas. Dessa spar kunna markas p5. lampligt satt. Med utgangspunkt Iran en full patron kunna flera av sparen Ida-has for aft sakerstalla utmatningen av en stor vitskemangd. Alternativt kan man tacka endast ett at gingen, dâ flera sma mangder skein injiceras i f6ljd. The latter is provided with a central piston rod 33, which extends through a guide sleeve 34, and during use of the syringe presses with the front face 35 directly against the rubber stopper 36 on a capsule 37, which contains injection means. This capsule, which usually consists of glass, is received in an outer sleeve 38, the front of which carries a bent extension tube 39, which leads to a nozzle 40 with. beam Aperture 41. This aperture can be, for example, 0.07-0.12 mm in diameter. Extending from the inner spirit of the tube is a tube-shaped, concentric needle 42, which had the task of puncturing the seal 43 at the front of the capsule 37. The front stroke of the piston 32 is stopped, by a shoulder 41 at the inner dude of the cyclist 30. that the piston rod or piston 35 performs a predetermined stroke. The sink finger discharged from the opening 41 is determined by the installation of the aisle connection 45 between a central main part 46 of the injector and an extension 47 at the front of the cylinder 30. By means of an end nut 48 the sleeve 38 is fastened to the central main part 46. The longer the latter is screwed forward on the demand 47, the more liquid is discharged. Recess 49 is successively exposed by an outer sleeve portion 50, which is supported by the central main portion 46, to show the amount to be discharged. These savings can be marked p5. aptly set. Based on Iran a full patron, several of the savers Ida-has for aft can secure the discharge of a large white man. Alternatively, you can thank only one thing, as several small amounts of skin are injected in succession.

Da den nalfria injektionssprutan i fig. 3 an- vandes, forbindes den medelst ett b8jligt rOr 51 (se fig. 4) med en hydraulisk cylinder 52. I ett visst fall har cylindern 19 mm haldiameter och 25 mm slaglangd. Den har en kolv 53, vars yttre Lade Sr hoplankad med en punkt mellan andarna pa en havstang 54. Denna havstang, som vid narliggande dude har en fast vridpunkt 55, Sr vid sin andra dude hoplfinkad med kolvstangen 56 till en relativt stor pneumatisk cylinder 57. Denna cylinder har vid ett visst exempel 57,3 mm haldiameter och 76 man slaglangd, varvid havstangen 54 ger en mekanisk utvaxling ,av 3:1. F8r enkelhetens skull visas cylindern dulabelverkande och har ett inlopp 58 for tillfersel av tryckluft eller annan tryekgas under arbetsslaget och ett inlopp 59 f6r motsvarande returslag. Dessa inlopp, vilka ocksa tjana sasom utlopp, aro anslutna till en fjarrstyrd tvavagsventil 60 med ett inlopp 61 Mr tillforsel av tryckluft eller annan tryckgas. Denna gas ledes lampligen i ett ror 62 Iran en (lake visad) luftkom- pressor genom en tryckregulator 63, som ex- empelvis kan installas for ett arbetstryck av 2,8 kp/cm2. Ett grenror 64 leder till en pedal- paverkad ventil 65 och vidare till ventilen 60 for paverkan av en slid eller annan inre, rorlig del, Tars uppgift Sr att koppla forbindelsen genom ventilen fran det .ena till det andra utloppet. Denna del visas i foreliggande fall med en. fjader sasom aterforande element. Det Sr att marka, att den visade anordningen möjhiggdr en protslig tillfOrsel .av tryckluft till cylindern 57 under antagande av att rorledningarna och andra hjalporgan aro lampligt dimensionerade. When the needle-free syringe in Fig. 3 was used, it is connected by means of a flexible tube 51 (see Fig. 4) to a hydraulic cylinder 52. In a certain case the cylinder has a holding diameter of 19 mm and a stroke of 25 mm. It has a piston 53, the outer charge of which is planked with a point between the spirits of a sea rod 54. This sea rod, which at a nearby dude has a fixed pivot point 55, is at its second dude fused with the piston rod 56 to a relatively large pneumatic cylinder 57. In a particular example, this cylinder has a holding diameter of 57.3 mm and a stroke of 76 man, the sea rod 54 giving a mechanical gear ratio of 3: 1. For the sake of simplicity, the cylinder is shown double acting and has an inlet 58 for supplying compressed air or other compressed gas during the working stroke and an inlet 59 for the corresponding return stroke. These inlets, which also serve as outlets, are connected to a remote-controlled two-way valve 60 with an inlet 61 for the supply of compressed air or other compressed gas. This gas is suitably led in a rudder 62 Iran a (lake shown) air compressor through a pressure regulator 63, which can be installed, for example, for a working pressure of 2.8 kp / cm2. A manifold 64 leads to a pedal-actuated valve 65 and further to the valve 60 for actuating a slide or other inner movable member. This part is shown in the present case with a. springs as a receding element. It should be noted that the device shown enables a protruding supply of compressed air to the cylinder 57, assuming that the pipelines and other auxiliary means are suitably dimensioned.

Da den nalfria injektionssprutan yid anvandning Sr fylld eller laddad och hylsan 50 an installd pa avsedd dos, paverkas pedalen 65. Resulterande plotsliga rorelse hos kolvstangen. 56 &adores via havstangs- och den hydrauliska lankanordningen till kolven i den nalfria injektionssprutan, som darvid arbetar sasom beskrivits i sanaband med fig. 1 och 2. Den vasentliga skillnaden Sr att den pneumatiska cylindern 57 Sr alltfOr stor for att fa plats i injektionssprutan och genom resulterande mekaniska fardel kan man arbeta med mycket lagre lufttryck. When the needle-free syringe is filled or charged during use and the sleeve 50 is installed at the intended dose, the pedal 65 is affected. Resulting sudden movement of the piston rod. 56 & adores via the sea rod and the hydraulic lance device to the piston in the needle-free syringe, which thereby works as described in the same connection with Figs. 1 and 2. The essential difference is that the pneumatic cylinder 57 is too large to fit in the syringe and through resulting mechanical part, you can work with much lower air pressure.

Den i fig. 4 visade anordningen kan, om sa Onskas, innehalla en manometer 66 for att visa arbetstrycket. Delarna 52-63 och awn manometern 66, a den fiirekommer, kunna monteras pa ett gemensanat faste t. ex. ett litet bord, skap eller vagn, medan pedalen 65 och tillhorande bOjliga ledningar lampligen kunna placeras pa golvet. Alternativt kan en tryckknapp ersatta pedalen 65, i -vilket fall tryckknappen kan vara monterad pa ovannamnda gemensamma faste. En viktig fordel med an-. ordningen i fig. 3 och 4 ãr att den drivs med samma tryckluftkalla, slam den, vilken an, vandes for ett dentalt, turbindrivet handverktyg. The device shown in Fig. 4 may, if desired, include a manometer 66 to show the working pressure. The parts 52-63 and the manometer 66, in which it appears, can be mounted on a common fastener, e.g. a small table, cupboard or trolley, while the pedal 65 and associated flexible wires can be conveniently placed on the floor. Alternatively, a push button may replace the pedal 65, in which case the push button may be mounted on the above-mentioned common fastener. An important advantage of an-. The arrangement in Figs. 3 and 4 is that it is operated with the same compressed air cold, sludge which was used for a dental, turbine-driven hand tool.

Claims

Patent claim:

A needle-free injection device, comprising a nozzle (12; 40)) farce with a fine nozzle opening (13; 41), a container (6; 37), arranged to receive injection liquid and to communicate with the nozzle and a means during the dispensing stage. (8; 36)),, arranged for expulsion of liquid through the nozzle to be pressed in the feed direction forward in the container, whereby a drive piston (15; 32) in the longitudinal direction of the apparatus has a substantially larger cross-sectional area than the expulsion means, Or. arranged in a fluid-driven cylinder (1; 30), which is connectable to an external pressure fluid source, characterized in that the drive piston (15; 32) is arranged far, directly pressure transfer to the expulsion means (8; 36) via a projecting pressure bearing projecting from the front end of the drive piston. piston rod (17, 20; 33, 35).

2. A needle-free injection device according to claim 1, characterized in that the cylinder (1) is arranged for pneumatic operation and is connected to a snap-operated valve for compressed air supply.

3. A needle-free injection device according to claim 1, characterized in that the cylinder (1; 30) is arranged for hydraulic, aulic operation and by means of a hydraulic system connected to a hydraulic piston device (52), which is actuated by a pneumatic pressure piston device (57), - which Or connected via a snap-acting valve (GO) for pressure clutch supply.

A needle-free injection apparatus according to claim 3, characterized by a haystack device (54) for pressure transfer between the pneumatic piston device (57) and said hydraulic system, which ph mechanically vaguely increases the pressure ratio.

A needle-free injection device according to any one of claims 2-4, characterized in that the snap-acting valve (60) for supplying pressurized gas to the pneumatic cylinder (57) itself is pneumatically driven and actuated with a control valve (65), so, m phverkas by the one who skates the syringe.

A needle-free injection device according to any one of the following patent claims, characterized by a container or a holder (4, 46) for a cartridge (6; 37) with injection means saint: of a screw cap installation, device (22 '; 50) for regulate the cartridge layer in relation to the front layer father, the drive piston (15; 32) for expelling liquid from the cartridge.

7. A needle-free injection device according to claim 6, characterized in that the drive piston (15; 32) is arranged for a constant stroke and that the screw mechanism (22 '; 50) is arranged to regulate the cartridge holder (4; 46) relative to the main part of the device ( 1; 47).

8. A non-free injection apparatus according to claim 7, characterized in that the piston stroke Or is controllable by means of said screw mechanism (22 '; 50).

A needle-free injection device according to claim 6 or 7, characterized in that the screw mechanism consists of coaxial, overlapping rar-shaped, parts (22 ', 1; 50, 47) calibrated to show the dose for which the device is installed. Request publications: Patents from Germany 883 328; USA. 2,921,582, 2,928,390.