SE202402C1

SE202402C1 -

Info

Publication number: SE202402C1
Authority: SE
Publication date: 1965-01-01

Description

KLASS INTERNATIONELLSVENSK A61 m5/08 30 lc,3/0 PATENT- OCH REGISTRERINGSVERKET Ans. 10313/1960 inkorn den 26/10 1960 ntlagd den 31/5 196 R H WERNBORG, MOLNDAL Sarskik fur engfingsbruk avsedd injektionsspruta Foreliggande uppfinning hanfor sig till sadana, sarskilt f or engangslbruk avsedda injektionssprutor av det slag, som omfatter, dels en i sin bakre Uncle helt oppen cylinder, dels en i cylindern inford kolv, uppvisande ett mot cylindervaggen tatande kolvhuvud och en claimed sammanhangande, ur cylindern sta.- digt utskjutande kolvstangsdel, varvid saval cylindern som kolven- aro vardera utforda ett stycke av plast, foretradesvis termoplast av typen polyeten, polypropen eller polystyren. CLASS INTERNATIONAL SWEDISH A61 m5 / 08 30 lc, 3/0 PATENT AND REGISTRATION AGENCY Ans. 10313/1960 inkorn den 26/10 1960 ntlagd den 31/5 196 RH WERNBORG, MOLNDAL Sarskik fur engfingsbruk intended injection syringe The present invention relates to such, especially disposable injection syringes of the type which comprise, partly in its rear Uncle fully open cylinder, partly a piston inserted into the cylinder, having a piston head facing the cylinder wall and a claimed continuous piston rod part projecting from the cylinder, the saval cylinder and the piston each challenging a piece of plastic, preferably thermoplastic of the polyethylene type. , polypropylene or polystyrene.

Vid hittills kande typer av sadana injektionssprutor liar det alltid varit brukligt att forse kolvhuvudet med ett separat tillverkat tdtningselement i form av en ring, en manschett eller en hatta, som alltsa maste anbringas pa eller sammanfogas med kolvhuvudet, innan kolven sasom en. komplett enhet kan inforas i cylindern och sprutan bli redo for funktion. Detta anbringande av ett separat framstallt tatningselement pa kolven, som oftast maste utforas manuellt, medfor en sadan komplicering och fordyring av spruttillverkningen, att man haft utomordentligt stora svarigheter for att ieke saga helt misslyckats med att komma ned till sa laga priser pa sprutorna, som maste kravas for att dessa skola kunna anvandas uteslutande for engangsbruk, dvs. skola kunna bortkastas, sa snart de begagnats en enda gang. In the case of hitherto known types of such syringes, it has always been customary to provide the piston head with a separately manufactured sealing element in the form of a ring, a cuff or a hat, which must therefore be applied to or joined to the piston head before the piston as one. complete unit can be inserted into the cylinder and the syringe ready for operation. This application of a separately produced sealing element to the piston, which usually has to be done manually, entails such a complication and increase in the cost of spraying production that one has had extraordinarily large responsibilities for not even failing to come down to such low prices on the sprayers. required for these schools to be used exclusively for single use, ie. should be discarded as soon as they are used once.

Foreliggande uppfinning erbjuder en losning pa detta speciella problem genom att mojliggore en fullt komplett kolv med erforderliga tatningar i ett enda arbetsmoment, varvid samtidigt kolvtatningsanordningen blir av en typ, som är fullt effektiv icke blott vid utstiitning av vatska ur sprutan utan ocksa. vid insugning av vatska i denna. The present invention offers a solution to this particular problem by enabling a fully complete piston with required seals in a single operation, while at the same time the piston sealing device becomes of a type which is fully effective not only in expelling liquid from the syringe but also. when sucking water into it.

Det for uppfinningsforemalet sarskilt kan netecknande är, att tatningen mellan kolven och cylinder. är astadkomrnen, genom att i ett stycke med kolvhuvudet aro utformade tva axiellt atskilda, ringformiga flansar, av vilka den framre pa i och for sig kant salt är riktad snett framet utat och befinner sig periferiellt utanfor en vasentligen cylindrisk del av kolvhuvudet, medan den andra bakre flansen Or riktad radiellt utat Iran kolvhuvudets bakre kant och anordnad att forst vid kolvens inforande i cylindern erhalla ett bakatvikt lage, i vilket dess ytterkant av plastmaterialets elasticitet fjadrande anpressas mot cylindervaggen for att tillforlitligt tata vid insugning av vatska i sprutan genom kolvens tillbakadragning i cylindern. Framforallt är det darvid den angivna utformningen av den bakre flansen, som mojliggiir en rationell tillverkning av en komplett kolv i ett enda arbetsmoment. What is particularly characteristic of the object of the invention is that the seal between the piston and the cylinder. are provided by two integrally spaced annular flanges formed integrally with the piston head, the front of which per se edge salt is directed obliquely outwards and is peripherally outside a substantially cylindrical part of the piston head, while the other rear flange Or directed radially outwards Iran the rear edge of the piston head and arranged to receive a rear-folded bearing only when the piston is inserted into the cylinder, in which its outer edge of the elastic material of the plastic material is resiliently pressed against the cylinder cradle to reliably absorb liquid into the syringe by the piston retraction . Above all, it is the specified design of the rear flange which enables a rational manufacture of a complete piston in a single operation.

Vid en. foredragen utforingsform av inj ektionssprutan enligt uppfinningen Kr darjamte cylindern i narheten av sin oppna, bakre ande pa i och for sig kant satt forsedd med en vidgad del for upptagande av det flansforsedda kolvhuvudet under sprutans lagring, varvid namnda vidgade del i syfte att forhindra en bestaende och tatningen aventyrande deformation av kolvflansarna uppvisar en inre diameter, som i huvudsak svarar mot den bakre kolvflansens ytterdiameter i ovikt skick. By a. The preferred embodiment of the syringe according to the invention comprises the cylinder near its open, rear end per se provided with a widened part for receiving the flanged piston head during storage of the syringe, said widened part in order to prevent an existing and the sealing adventurous deformation of the piston flanges has an inner diameter which substantially corresponds to the outer diameter of the rear piston flange in the unfolded condition.

For uppfinningens fortydligande skall nu hanvisas till bifogade ritning, dar fig. 1 visar en sidovy av sprutan, medan fig. 2 i storre skala visar kolvhuvudet med tillhorande tatningsflan.sar fore inforandet i cylindern. For the clarification of the invention, reference will now be made to the accompanying drawing, in which Fig. 1 shows a side view of the syringe, while Fig. 2 shows on a larger scale the piston head with associated sealing flanges before insertion into the cylinder.

Den visade sprutans kolv bestar av en kolvstandsdel 1 med korsformad tvarsektion och ett i ett stycke med kolvstangsdelen utfort, vasentligen cylindriskt kolvhuvud 2. I ett 2 stycke med kolvhuvudet 2 aro utformade tva axiellt atskilda, ringformiga flansar 3 resp. 4, av vilka den framre 3 är riktad snett framat utat, sa att mellan dess insida och det egentliga kolvhuvudet uppkommer ett ringformigt spar 3a. Den bakre Hansen 4 är riktad radiellt uth.'t frail kolvhuvudets bakre kant och har en sadan i riktning utat avtagande tjocklek, att dess mot den framre Hansen 3 vanda "sida är i huvudsak konisk, medan dess baksida ãr i huvudsak plan. The piston of the syringe shown consists of a piston stand part 1 with a cross-shaped cross-section and an essentially cylindrical piston head 2 formed in one piece with the piston rod part. In a 2 piece with the piston head 2, two axially separated, annular flanges 3 and 4, of which the front 3 is directed obliquely forwards outwards, so that between its inside and the actual piston head an annular groove 3a arises. The rear Hansen 4 is directed radially towards the rear edge of the piston head and has such a decreasing thickness in the direction of direction that its side towards the front Hansen 3 is substantially conical, while its rear side is substantially flat.

Sprutans cylinder 5, som i likhet med kolven Sr utf6rd i ett stycke av plast och som i sin framre donde 6 pa vanligt satt Sr utformad att mottaga en injektionsnal, liar utefter storre delen av sin langd en innerdiameter, som Sr sa avpassad efter ytterdiametem hos kolvhuvudets 2 flansar 3, 4, att dessa med sina yttre kanter komma att fjadrande anpressas mot cylindervaggen, varvid den bakre Hansen 4 vid kolvens inforande i cylindern erhaller ett bakatvikt 'age, men att den genom omvikning kw:rimer att tillforlitligt tata vid insugning av vatska i sprutan, da kolven drages bakat i cylindern. NKr injektionsvatskan skall utstotas ur sprutan och kolven alltsa tryckes framat i cylindern, kommer vatskan naturligtvis att paverka den framre Hansen 3, sh att denna tryekes annu effektivare an mot cylindervaggens insida. The cylinder 5 of the syringe, which, like the piston Sr, is made of a piece of plastic and which in its front tube 6 is usually designed to receive an injection needle, has an inner diameter along most of its length, which is adapted to the outer diameter of the syringe. The flanges 3, 4 of the piston head 2, that these with their outer edges will be resiliently pressed against the cylinder cradle, the rear Hansen 4 at the insertion of the piston in the cylinder receiving a rear weight, but that by folding it: rim to reliably tighten when sucking in liquid in the syringe, as the piston is pulled back into the cylinder. If the injection liquid is to be expelled from the syringe and the piston is thus pushed forward in the cylinder, the liquid will of course affect the front Hansen 3, so that it is pressed even more effectively against the inside of the cylinder cradle.

For att sprutan skall kunna lagras lang tid fore an-vandandet, utan att man dadar skall behOva riskera, att de av plastmaterialet utformade thtningsflansarna 3 och 4 skola bliva bestaende deformerade pa sadant satt, att deras tatningsfunktion dventyras, Sr i cylinderns 5 oppna, bakre ande anordnad en utvidgning 7, som liar nagot starre diameter an cylinderloppet i avrigt, sa att kolvhuvudets tatningsflansar 3, 4 komma att anligga mot utvidgningens 7 vagg med endast ringa tryck. Intill dessa att sprutan skall anvandas, är utvidgningen 7 avsedd att upptaga kolvhuvudet, sasom antytts med punktstreckade linjer I fig. 1, och forst da sprutan skall begagnas, tryckes kolven langre in i cylindern. In order for the syringe to be stored for a long time before use, without the need to risk that the sealing flanges 3 and 4 formed of the plastic material will be permanently deformed in such a way that their sealing function is compromised, Sr in the open, rear of the cylinder 5 an extension 7, which has a slightly larger diameter than the cylinder bore in the opposite direction, so that the sealing flanges 3, 4 of the piston head will abut against the cradle of the extension 7 with only slight pressure. Until the syringe is to be used, the extension 7 is intended to receive the piston head, as indicated by dotted lines in Fig. 1, and only when the syringe is to be used is the piston pushed further into the cylinder.

Lämpligen kan cylindern 5, som foretradesvis är utford av transparent material, pa sin utsida vara forsedd med ett marke S, som anger det 'age, till vilket kolvhuvudet maximalt bar dragas tillbaka i cylindern under sprutans fyllning med vatska. Conveniently, the cylinder 5, which is preferably challenged with transparent material, may be provided on its outside with a mark S, indicating the age to which the piston head can be retracted to a maximum in the cylinder during the filling of the syringe with liquid.

Detaljutformningen av sprutan kan givetvis varieras alit efter det dndamal, ftir vilket spru tan är avsedd. Utvidgningen 7 kan eventuellt avvaras eller ersattas med endast ringformiga spar for flansarna. The detailed design of the syringe can of course be varied according to the type for which the syringe is intended. The extension 7 can possibly be dispensed with or replaced with only annular grooves for the flanges.

Claims

Patent claim:

A special disposable syringe of the type used for this purpose, which comprises a cylinder in its rear end completely intact, and a piston inserted into the cylinder, having a piston head towards the cylinder wall and an associated piston rod portion projecting therefrom, wherein the cylinder the piston is each challenged in one piece ay plastic, characterized in that the sealing between the piston (2) and the cylinder (5) is achieved by forming in one piece with the piston head two axially separated annular flanges (3, 4), of which the front (3) on per se edge salt is directed obliquely -from; food outwards and is peripherally outside a substantially cylindrical part of the piston head, while the other, rear Hansen (4) is directed radially outwards from the rear edge of the piston head and arranged to first, by the insertion of the piston into the cylinder, obtain a rear-folded bearing, in which its outer edge of the elasticity of the plastic material is resiliently pressed against the cylinder cradle to take yid suction of liquid into the syringe by the piston retraction in the cylinder.

2. A syringe according to claim 1, characterized in that the cylinder (5) near its open, rear dude on itself edge salt is provided with a widened part (7) for receiving the flanged piston head during storage of the syringe, wherein said widened part (7) in order to prevent an existing and sealingly adventurous deformation of the piston flanges (3, 4) has an inner diameter which substantially corresponds to the outer diameter of the rear piston flange (4) in unfolded condition. Request publications: Patents frcin France 1,228,933; Germany 1,070,785; USA. 1 410 530.