ITPT930005A1

ITPT930005A1 - DISPOSABLE SYRINGE WITH RETRACTABLE NEEDLE.

Info

Publication number: ITPT930005A1
Application number: IT000005A
Authority: IT
Inventors: Poala Danesi
Original assignee: Poala Danesi
Priority date: 1993-02-02
Filing date: 1993-02-02
Publication date: 1994-08-02
Also published as: IT1265947B1; ITPT930005A0

Description

D E S C R I Z I O N E DESCRIPTION

Precedent emente al trovato sul mercato sono presenti i seguenti tipi di siringhe di dimensioni e materiali diversi: Prior to the invention, the following types of syringes of different sizes and materials are present on the market:

?a) Tradizionali siringhe di vetro speciale (non fra= gil? e resistente alle alte temperature) con ago me= tallico da applicare di volta in volta sulla testa del corpo esterno, che vengono sterilizzate tramite bolli= tura dei componenti. ? a) Traditional special glass syringes (not fra = gil? and resistant to high temperatures) with metal needle to be applied from time to time on the head of the external body, which are sterilized by blotting the components.

?b) Le siringhe monouso ("usa e getta"), normalmente di materiale plastico ed ago metallico, che devono essere usate una sola volta, ma che tuttavia possono es= sere adoperate incautamente pi? volte e da pi? perso= ne. ? b) Disposable syringes ("disposable"), normally made of plastic material and metal needle, which must be used only once, but which can nevertheless be used recklessly more? times and for more? lost = ne.

?c) Siringa monouso ad ago retrattile descritta nel brevetto per invenzione industriale, ? c) Disposable syringe with retractable needle described in the patent for industrial invention,

Questa siringa ? dotata di un dispositivo atto a consentire il rientro automatico e definitivo dell?ago all'interno della si= ringa dopo la iniezione del fluido medicale. Il rien= tro definitivo dell'ago ? provocato dall?estensione di una molla elicoidale, tenuta in compressione pri= ma e durante il tempo di utilizzo da un pistone (por= tante l'ago), su cui agisce la pressione di un li= quido. Appena lo stantuffo iniettante il fluido medi= cale raggiunge il fondo della siringa, un?asta flessibile provvede a svuotare il liquido contenuto nel serbatoio per effetto della spinta di una molla com= pressa, il che determina il rientro definitivo del= l'ago nel corpo della siringa impedendo il successi= vo impiego? Detta siringa esplica con sicurezza la propria funzione, tuttavia, rispetto al trovato, ? un manufatto relativamente pi? complicato, il che in= fluisce negativamente nella realizzazione pratica e sul costo? This syringe? equipped with a device suitable for allowing the automatic and definitive re-entry of the needle inside the syringe after the injection of the medical fluid. The definitive re-entry of the needle? caused by the extension of a helical spring, held in compression before and during the time of use by a piston (holding the needle), on which the pressure of a liquid acts. As soon as the plunger injecting the medium fluid reaches the bottom of the syringe, a flexible rod empties the liquid contained in the tank due to the thrust of a compressed spring, which determines the definitive return of the needle into the syringe body preventing subsequent use? Said syringe performs its function with certainty, however, with respect to the invention,? a relatively more artifact? complicated, which negatively affects the practical implementation and the cost?

Come ? noto, oggi l'uso di una medesima siringa da parte di pi? persone e un problema sempre pi? sentito ed attuale, per il fatto che malattie contagiose trovano un facile veicolo di propagazione attra= verso l'ago della siringa medesima. How ? known, today the use of the same syringe by pi? people and a problem more and more? felt and current, due to the fact that contagious diseases find an easy vehicle for propagation through the needle of the syringe itself.

La siringa costituente il trovato, di dimensioni correnti per iniezioni endovenose, intramuscolari, sot= tocutanee e intradermiche, risolve con sicurezza il problema per il fatto che la fondamentale caratteri= stica ? quella di possedere un nuovo dispositivo au= tomatico tale da attuare un rientro irreversibile del= l?ago ed inoltre possiede l?attributo della industria lit?. The syringe making up the invention, of current dimensions for intravenous, intramuscular, subcutaneous and intradermal injections, resolves the problem with certainty due to the fact that the fundamental characteristic? that of possessing a new automatic device such as to effect an irreversible return of the needle and also possesses the attribute of the lit industry.

Ci? premesso, si procede ad una precisa descrizione del trovato, facendo riferimento alle allegate TAVOLE 1? 2, che non hanno un carattere limitativo, ma co= stituiscono un esempio qualunque ed hanno lo scopo di mettere in evidenza gli attributi caratteristici. There? having said that, we proceed to a precise description of the invention, referring to the attached TABLES 1? 2, which do not have a limiting character, but constitute any example and have the purpose of highlighting the characteristic attributes.

La pressione manuale sulla testa dello stantuffo 1 (cilindro mobile) trasmette la spinta al liquido medi cale contenuto nel corpo cilindrico esterno 6 al fi ne di consentire al liquido stesso di fuoriuscire dal l?ago. Lo stantuffo 1 scorre, per il tramite della guarnizione anulare 11, all?interno del corpo cilin= drico esterno 6 e, anzich? riversare il liquido me= dicale in tutta la sezione interna circolare, utiliz= za la sezione anulare 6a compresa fra il corpo ci= lindrico esterno 6 ed il corpo cilindrico cavo 7. Il sistema di non riutilizzo della siringa ? ottenuto sfruttando i movimenti relativi fra lo stantuffo 1 ed il corpo cilindrico cavo 7, i medesimi che vengo= no compiuti normalmente per eseguire una comune inie= zione senza richiedere particolari accorgimenti. The manual pressure on the head of the plunger 1 (movable cylinder) transmits the thrust to the medium liquid contained in the external cylindrical body 6 in order to allow the liquid itself to escape from the needle. The piston 1 slides, by means of the annular gasket 11, inside the external cylindrical body 6 and, instead of? pour the medical liquid throughout the internal circular section, using the annular section 6a between the external cylindrical body 6 and the hollow cylindrical body 7. The syringe non-reuse system? obtained by exploiting the relative movements between the piston 1 and the hollow cylindrical body 7, the same which are normally carried out to carry out a common injection without requiring particular measures.

All?interno della sommit? dello stantuffo 1 ? allog giata un?asta forata 5 tenuta nella posizione indi= cata nel grafico di destra della TAVOLA 1 dal con= tatto con la testa 8c del serbatoio elastico 8, All'interno del serbatoio elastico 8, il quale nella zona di contatto 8b ? inserito a forza nel cor; po cilindrico cavo 7, ? contenuta una opportuna quantit? di liquido a pressione che determina l'ac= coppiamento conico 10 fra il pistone 9 e la su= perficie interna conica del corpo 6, mettendo in li= nea i due fori di adduzione 12 con il foro di addu= zione 13 del pistone 9s il foro 13 ? collegato con il foro 14, il quale a sua volta ? collegato all'ago 15. I fori 12 e 13 risultano sempre in comunicazione fra loro per il fatto che, all'altezza di costruzione prevista, il pistone 9 presenta una scanalatura circolare esterna perpendicolare all'asse del pistone, ovviamente in corrispondenza dell'al= tezza del foro 12. Inside the summit? piston 1? housed a perforated rod 5 held in the position indicated in the graph on the right of TABLE 1 by contact with the head 8c of the elastic reservoir 8, inside the elastic reservoir 8, which in the contact area 8b? forcibly inserted into the heart; hollow cylindrical bit 7,? contained an appropriate quantity? of liquid under pressure which determines the conical coupling 10 between the piston 9 and the conical internal surface of the body 6, placing the two inlet holes 12 in line with the inlet hole 13 of the piston 9s hole 13? connected with hole 14, which in turn? connected to the needle 15. The holes 12 and 13 are always in communication with each other due to the fact that, at the planned construction height, the piston 9 has an external circular groove perpendicular to the axis of the piston, obviously in correspondence with the = hole size 12.

Pi? specificatamente, si illustrano le successive fa= si per effettuare una normale iniezione endovenosa, intramuscolare o sottocutanea. Pi? specifically, the following steps are illustrated for carrying out a normal intravenous, intramuscular or subcutaneous injection.

Superiormente la posizione univoca fra il serbatoio elastico 8 ed il terminale del corpo cilindrico ca= vo 7 ? ottenuta tramite la flangia 8a. Al fine di determinare l'accoppiamento forzato fra il serbatoio elastico 8 e il corpo cilindrico 7, la superficie esterna 8b del serbatoio elastico medesimo ? conica ed b di diametro maggiore del diametro interno del corpo cilindrico cavo 7? La parte elastica 8d del serbatoio 8 ? a forma di soffietto per tutta la lunghezza fino al terminale 8e di collegamento sta= bile con il pistone 9, Above the univocal position between the elastic reservoir 8 and the terminal of the cylindrical body ca = vo 7? obtained through the flange 8a. In order to determine the forced coupling between the elastic reservoir 8 and the cylindrical body 7, the outer surface 8b of the elastic reservoir itself? conical and b with a diameter greater than the internal diameter of the cylindrical hollow body 7? The elastic part 8d of the tank 8? bellows-shaped along the entire length up to the terminal 8 and stable connection with the piston 9,

Il sollevamento dello stantuffo 1 determina, trami= te la guarnizione anulare 11, l?aspirazione del li= quido medicale da iniettare. Durante il sollevamento dello stantuffo 1 fino al punto necessario per aspi rare la giusta quantit? di liquido medicale, l?asta flessibile forata 5 (solidale con lo stantuffo 1) appena superata la sommit? della estremit? 8c sfrut ta le caratteristiche elastiche del materiale di cui essa ? composta e si allinea spontaneamente sul pro= prio asse rettilineo risultando perfettamente in li= nea con l?asse del serbatoio elastico 8, Effettuata l?aspirazione del liquido medicale, inizia la iniezione. Lo stantuffo 1 (e con esso l?asta 5) tramite la guarnizione anulare 11 avanza nella sezi ne anulare 6a spingendo il liquido medicale verso i due fori di adduzione 12 (collegati alla sezione anulare) e attraverso essi il liquido avanza dapprima nel foro 13, poi nel foro 14, infine nell'ago 15? In tal modo ? completato il ciclo del passaggio del liquido medicale. Immediatamente prima del termine d questa operazione, ossia allorquando la guarnizione anulare 11 si trova in prossimit? del fondo della siringa, l'asta 5 ha completato la perforazione della testa 8c del serbatoio elastico 8, per cui l'asta 5 medesima, tramite il foro che corre lungo il suo asse, svuota il corpo del serbatoio elastico 8 del liquido ivi contenuto. Lo svuotamento, molto veloce, del serbatoio elastico 8 avviene tramite il foro dell'asta 5 e attraverso i condotti 3 realizzati dalla parete 2, per cui la dispersione del liquido avviene all'interno dello stantuffo 1. Lo svuotamento del serbatoio 8 determina la cessa= zione della forza di deformazione elastica longi= tudinale del serbatoio medesimo e quindi, cessata tale deformazione, il serbatoio 8 riprende automa= ticamente la sua forma originaria (indicata sulla parte sinistra della TAVOLA 1), trascinando con s? il pistone 9 e l'ago 15 all'interno del corpo 6 della siringa. The lifting of the piston 1 determines, by means of the annular gasket 11, the aspiration of the medical liquid to be injected. While lifting the plunger 1 to the point necessary to draw the right amount? of medical liquid, the perforated flexible rod 5 (integral with the plunger 1) just past the top? of the extremity? 8c takes advantage of the elastic characteristics of the material of which it? composed and spontaneously aligns on its straight axis resulting perfectly in line with the axis of the elastic reservoir 8. Once the medical liquid has been aspirated, the injection begins. The piston 1 (and with it the rod 5) through the annular gasket 11 advances into the annular section 6a pushing the medical liquid towards the two supply holes 12 (connected to the annular section) and through them the liquid first advances into the hole 13 , then in hole 14, finally in needle 15? Thereby ? completed the cycle of the passage of the medical liquid. Immediately before the end of this operation, that is, when the annular gasket 11 is in the vicinity? of the bottom of the syringe, the rod 5 has completed the perforation of the head 8c of the elastic reservoir 8, so that the rod 5 itself, through the hole that runs along its axis, empties the body of the elastic reservoir 8 of the liquid contained therein . The very fast emptying of the elastic tank 8 takes place through the hole in the rod 5 and through the ducts 3 made by the wall 2, whereby the dispersion of the liquid takes place inside the piston 1. The emptying of the tank 8 determines the cessation = action of the longitudinal elastic deformation force of the tank itself and therefore, once this deformation has ceased, the tank 8 automatically resumes its original shape (indicated on the left side of TABLE 1), dragging with s? the piston 9 and the needle 15 inside the body 6 of the syringe.

Ovviamente, la stabilit? della posizione esterna del l'ago 15 ? garantita dalla pressione esercitata dal liquido incomprimibile contenuto all'interno del serbatoio elastico 8: detta pressione agisce sul pistone 9 e pertanto anche sull'ago 15. Obviously, the stability? the outer position of the needle 15? guaranteed by the pressure exerted by the incompressible liquid contained inside the elastic reservoir 8: said pressure acts on the piston 9 and therefore also on the needle 15.

Il foro 4, praticato nello stantuffo 1, viene utilizzato nella fase di assemblaggio della siringa per il corretto posizionamento dell,asta 5 alla parete esterna 8c del serbatoio elastico 8. The hole 4, made in the plunger 1, is used in the assembly step of the syringe for the correct positioning of the rod 5 to the external wall 8c of the elastic reservoir 8.

Il non riutilizzo della siringa costituente il tro= vato ? determinato dal fatto che, ad iniezione termi nata, ossia con pistone ed ago all'interno del corpo della siringa, qualsiasi movimento imposto allo stan tuffo per effettuare una nuova iniezione ? pratica= mente impossibile? The non-reuse of the syringe constituting the product? determined by the fact that, at the end of the injection, that is with the piston and the needle inside the body of the syringe, any movement imposed on the plunger to carry out a new injection? practice = impossible mind?

Per variare la quantit? del liquido medicale aspi= rato ? sufficiente variare le dimensioni del corpo cilindrico esterno 6 e la guarnizione anulare 11. rimanendo invariato il corpo cilindrico cavo 7: in tal modo varia, infatti, la sezione anulare 6a ove viene aspirato il liquido? To vary the quantity? of aspirated medical liquid? it is sufficient to vary the dimensions of the external cylindrical body 6 and the annular gasket 11. while the hollow cylindrical body 7 remains unchanged: in this way, in fact, the annular section 6a where the liquid is sucked varies?

Claims

R I V E N D C A Z I O N I -1)? DISPOSABLE RETRACTABLE NEEDLE SYRINGE ", characterized by the fact that it constitutes a completely original disposable syringe (" disposable ") due to the fact that it contains a particular device designed to allow the automatic and definitive re-entry of the needle inside the syringe itself when the medical liquid has been injected, preventing subsequent use. 2) Said disposable syringe with retractable needle as per the previous claim and characterized by the fact that during the aspiration phase the medical liquid flows into the annular chamber between the external cylindrical body and the plunger which also contains the elastic reservoir: ? of the plunger has a sealed annular gasket, which makes it impossible to leak medical liquid. Pu? be (whatever for geometry and material the annular gasket. 3) Said disposable syringe with retractable needle as per the preceding claims is characterized by the fact that it has a hollow cylindrical body inside the plunger, the actuation of which determines the outflow of the medical liquid. inserted the elastic reservoir containing a liquid under pressure, which determines on the piston connected to the needle the necessary pressure to keep the needle in an external position during the injection phase. Advantageously, but not exclusively, the elastic reservoir has the following characteristics: -a) A head on which the perforated flexible rod is made. ? b) A contact flange on the end of the hollow cylinder body. -e) The outer surface below the flange? conical in shape and with a diameter greater than the internal diameter of the hollow cylindrical body. ? d) The part up to the piston? particularly elastic (bellows), in order to allow the necessary elongation of the elastic tank and therefore of the mobile equipment connected to it (piston, needle) during the injection phase of the medical liquid and the subsequent and automatic elastic return to its original form with an empty elastic tank. Pu? the elastic reservoir in every detail can be whatever in shape, geometry and material. -4) Read disposable syringe with retractable needle as per the preceding claims and characterized in that at the end of the injection phase a flexible piercing rod causes the rapid outflow of the liquid contained in the elastic reservoir. The emptying of the elastic tank determines the cessation of the deformation force of the tank itself and therefore, once this deformation has ceased, the tank automatically resumes its original shape by dragging the needle inside the body of the ring. The flexible rod and the head of the tank on which the flexible rod acts can be of any shape, geometry and material. -5) Betta disposable syringe with retractable needle as per the previous claims and characterized by the fact that on the internal head of the plunger? the end of the flexible rod is rigidly housed and is drilled for rapid emptying of the liquid contained in the elastic reservoir: said liquid passes through two channels and is dispersed inside the piston. Can the housing system of the perforated rod, the shape and the position of the emptying channels be any? -6) Said disposable syringe with retractable needle as per previous claims and characterized by the fact that the extremity? free of the perforated rod for the rapid emptying of the liquid contained in the tank ela = ethical contacts laterally the top? of said ger = batoio: in order to favor the sliding of the e = stremit? of the rod, called lateral surface? van = wisely but not exclusively conical. 7) Said disposable syringe with retractable needle as per the preceding claims and characterized in that the conical part of the piston can? also be made with a shirt of any material. Said disposable syringe with retractable needle as per the preceding claims and characterized in that in the terminal area the piston connected to the needle and the internal surface of the foreign cylindrical body do not have a conical coupling with the suction and outflow holes of the medical liquid obtained in the male (piston) and in the female (external cylindrical body). The conical coupling, the inflow and outflow holes for the medical liquid can be of any geometry. 9) Said disposable syringe with retractable needle as per the previous claims and characterized in that the suction and discharge holes obtained in the terminals of the piston and of the external cylindrical body are always in communication with each other due to the fact that, at the height of construction envisaged, the piston has an external circular groove perpendicular to the axis of the piston, obviously in correspondence with the height of the hole obtained in the external cylindrical body. Pu? be whatever the geometry of the groove or other solution that performs the same function,? 10) Said disposable syringe with retractable needle as per previous claims and characterized by the fact that for the positioning (in the assembly phase of the syringe) of the extremity? free of the rod perforated on the top? of the spring reservoir, a hole was made in the side surface of the plunger. 11) Said disposable syringe with retractable needle as per the previous claims and characterized by the fact that the dimensions, shape and materials of all the components of the syringe can be whatever: any components of different size, shape and material, which perform the same specific functions described. -12) Said disposable syringe with retractable needle as per the previous claims, as described in the present report and represented in the attached TABLES 2