US2550394A - Disposable syringe - Google Patents

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\ INVENTORS.

Patented Apr. 24, ,1951A UNITED STATES OFFICE. f t 'n 2,550,354; l DISPOSABLE SYRINGE HowarliIH. Young,- Waukegan, Douglas A. Loper, Hubbard'Woods, and Mack-Ra Fields, Liberty-YV ville, Ill., assignors to Abbott Laboratories,` North Chicago, Ill., a corporation of Illinois Application December 9, isaiciseriai Nro. 64,342

, Our invention relates to a unitary package and vmedicine injector especially effective in distribluting and administering therapeutic agents of such characteristics that it is necessary or highly desirable 4that the attending physician put theml oppositelydirected nger grips I2 integrally unit- -ed'with it at its upper end. The 1ower closed end ofl the barrel has afcentral boss I4 in which a conventional cannula I6 is firmly embedded. The rubber piston I8 is at an intermediate point in the barrel and houses a charge of powdered medicament 26 in the space below it. It is provided with a downwardly opening central recess 22 to receive the upper end of the cannula I6. Imbedded vin the piston is a threaded stud 23.

The space inside the cannula, in the packaged form, is substantially completely filled by a filler rod 24, the upper end of which projects above the upper end of the cannula and thel Wer end of which is bent around into a hook 26. The hook 26 is slightly resilient and has enough friction against the Walls of the rod 28 to cause it 'to' corne out with the rod When the rod is removed. 'vIhe entire exterior portions of the cannula I6 and the rod 24 are completely housed in the hollow piston rod 28. The piston rod has a saucer-shaped annular flange 30 at its upper end, which serves as athumb rest or abutment in making an injection, and the piston rod has a snug lit on the boss I4. At its lower end it is hermetically closed at 32 and includes a short extension below the closure drilled and threaded at 34 to iit the stud 23. The entirety of the parts so far described, with the filling 20 in place, and all in completely sterile condition, may be wrapped in a sterile cellophane wrapper, indicated at 36. y

When the medicine is to be administered, the user removes the cellophane wrapper 36, and if he touches the finger grips I2 and barrel Ill with unsterilized fingers at that time, no harm is done. I-Ie then pulls the piston rod 28 o the boss I4, pulls the ller 24 out of the rod and throws the `filler away, and reassembles the piston rod in 4 claims. (01.*1'284218) the position of Figure l.r In this process he I 'touches vno part thatineeds to be kept sterile. In

V lying intermediate the ends of said barrel to vrare instances, if the ller 24V happens not to comey out with the ro'd 2B, it is quite easy for ,him to take hold of the hook 26 and withdraw the rod without touchingthe cannula. He then -a slight withdrawal of.' the piston will. aspirate blood.. if he has entered a blood vessel.` After aspiration has indicated that the cannula end is properly, placed, the medicament is forced in andthe cannula withdrawn. Afterthe medicament has. been administered, theentire unit can be thrown away.

Others may readily adapt the invention for use under various conditions of service by employing one or more of the novel features disclosed. As at present advised with respect to the apparent scope of our invention, we desire to claim the following subject matter.

We claim:

1. A unitary disposable medicament syringe and package comprising, in combination: a barrel section having one end open and the other closed; outwardly extending grips on said barrel near the open end thereof; said closed end having a central axial boss; a cannula rmly imbedded in said boss and projecting outwardly; a filler rod obstructing and substantially filling said cannula and projecting beyond the outer end thereof; the projecting end of said filler rod being turned laterally to dene a handle easy of access without touching said cannula; a tubular piston rod and housing having a closed end and an open end, said open end having a snug fit on said boss; an outwardly projecting flange around the open end of said piston rod defining a pressure head; said piston rod having a short extension beyond its closed end; a piston, when in package assembly house a charge of medicament between itself and the closed end of said barrel; said piston and piston rod extension having threaded portions to connect said rod to said piston; a charge of medicament in said barrel below said piston; all the parts heretofore recited being in sterile condition; and a wrapper, proof against contamination, enclosing the entirety of said parts; Whereby the user, after removing said wrapping can remove said piston rod from said boss and assemble it with said piston, and remove said ller rod from said cannula, all without touching said cannula or any other part that needs to be kept sterile, until after contact with the patient is nished.

2. A unitary .Y disposable medicament syringe and package comprising, in combination: a barrel section having one end open and the other closed; outwardly extending finger grips on said barrel near the open end thereof; said closed end having a central axial boss; a cannula firmly imbedded in said boss and projecting outwardly; a ller rod obstructing and substantially filling said cannula and projecting beyond the outer end thereof; the projecting end of said filler rod being turned laterally to dene a handle easy of access without touching said cannula; a. tubular piston rod and housing having a closed end and an open end, said open end having a snug fit on said boss; an'outwardly projecting flange around the open end of said piston rod defining a pressure head; said piston rod having a short extension beyond its closed end; a piston, when in package assembly lying intermediate Y1the ends of said barrel to house a charge of medicament between itself and the closed end of said barrel; said piston and piston rod extension having threaded portions to connect said rod to said piston; and a charge of medicament in said barrel below said piston; all the parts heretofore recited being in sterile condition.

3. In a unitary disposable medicament syringe,

vin combination: a barrel having one end closed and the other open; a boss extending axially outward from the closed end of said barrel; a

,cannula rmly imbedded in said boss; a ller rod substantially filling said cannula and projecting beyond both ends thereof; the outer projecting 4 end of said ller rod being bent around to dene a handle easy of access without touching said cannula; a piston in said barrel; a tubular piston rod and housing having a closed end and an open end; said open end having a snug fit on said boss; said closed end and piston having co-operating portions shaped for screw thread assembly; said handle having a'friction t in said rod, whereby removal of said rod from said boss also removes said filler lfrom said cannula, but whereby said filler may thereafter be removed from said rod conveniently.

4. In a medicament syringe, in combination: a barrel having one end closed and the other open; a boss extending axially outward from the closed end of said barrel; a cannula rmly imbedded in said boss; a filler rod substantially filling said cannula; said ller having a projecting end forming a handle thereof; a piston in said barrel; a tubular piston rod and housing having a closed end and an open end; said open end having a snug t on said boss; said closed lend and piston having co-operating portions shaped for connecting them together.

HOWARD H. YOUNG.- DOUGLAS A. LOPER. MACK R. FIELDS.

Number j Name K Date 938,951 Bell -Nov. 2, 1909 1,179,561 Reed Apr. 18, 1916 V2,453,589 Poux Nov. 9,- 1948 2,453,590 Poux Y Nov. 9, 1948 2,453,591- Poux Nov.^9, 1948

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