Hypodermic syringe with parts disposable after use

Claim 2

A syringe comprising a syringe body delivered sterile ready for use to be discarded after a single usage, said syringe body having one extremity with connection means thereat for attachment to a syringe head, a needle mounted at the opposite extremity of said body, said needle extending partially into the interior of the body and partially externally thereof, said syringe body being delivered in combination with a cartridge of injectible fluid frictionally held in said body and including at one extremity thereof a closure non-slidably fitted in said cartridge and placed in facing relation with the part of the needle extending into the interior of the body, said cartridge including, at the other extremity thereof, a piston which is slidable in the cartridge, a removable case mounted on the body and covering a portion thereof and the externally extending portion of the needle while leaving said connection means exposed, means coupling said case and body for common rotation, and a detachable support mounted on the case and covering the rest of said body, said support being separable from the case and thus disengaged from the connection means.

Claim 3

The combination as claimed in claim 1 wherein said opposite extremity of said syringe body is provided with an aperture separate from said needle.

Claim 4

The combination as claimed in claim 1 wherein said cartridge comprises a tube of constant section fitted with said piston in fluid-tight relation, said closure at the opposite end comprising a plug of elastic material including a first part fitting into the interior of the tube and a second part external to the tube and having an external dimension greater than the internal dimension of the syringe body so that the plug exerts a frictional force against the internal face of the syringe body and opposes free sliding of the cartridge in the body.

Claim 5

The combination as claimed in claim 3 wherein said first part of the plug fitted into the interior of the tube of the cartridge has thin walls such that said first part is deformed elastically by the pressure of the liquid in the course of injection.

Claim 6

The combination as claimed in claim 4 wherein said plug has a blind cavity which opens at the exterior extreme face of said second part of said plug and which extends inside said first part of the plug.

Claim 7

The combination comprising a syringe head adapted to be retained by the user for permanent use without sterilization, a syringe body delivered in sterile state to the user said syringe head including at one extremity thereof connection means for attachment to said syringe body, said syringe body having at one extremity thereof means for complementary connection to the connection means of the syringe head, said syringe body being furnished to the user for attachment to the syringe head and comprising before its fixation to said syringe head, an injection needle situated at the extremity opposite to that of the complimentary connection means, said needle extending partially into the interior of the body and partially externally thereof, a cartridge of injectible fluid frictionally mounted in said body and having at one extremity thereof a closure non-slidably fitted in said cartridge and placed in facing relation with the part of the needle extending into the interior of the body, said cartridge including, at the other extremity thereof, a piston slidably mounted in the cartridge, a removable case mounted on the body and covering one portion thereof and the externally extending portion of the needle while leaving said complimentary connection means exposed, means coupling said body and case and permitting manual manipulation of the case, without contact of the fingers of the user with said body, said cartridge and said needle, for assembly of the complimentary connection means of said syringe body with the connection means of said syringe head, and a detachable support mounted on the case and covering the rest of said syringe body, said support being separable from the case thus exposing the complimentary connection means for successive attachment of sterile syringe bodies with the same syringe head.

Claim 8

The combination comprising a syringe head adapted to be retained by the user for permanent use without sterilization, a syringe body delivered in sterile state to the user said syringe head including at one extremity thereof connection means for attachment to said syringe body, said syringe body having at one extremity thereof means for complementary connection to the connection means of the syringe head, said syringe body being furnished to the user for attachment to the syringe head and comprising before its fixation to said syringe head, an injection needle situated at the extremity opposite to that of the complimentary connection means, said needle extending partially into the interior of the body and partially externally thereof, a cartridge of injectible fluid frictionally mounted in said body and having at one extremity thereof a closure non-slidably fitted in said cartridge and placed in facing relation with the part of the needle extending into the interior of the body, said cartridge including, at the other extremity thereof, a piston slidably mounted in the cartridge, a removable case mounted on the body and covering one portion thereof and the externally extending portion of the needle while leaving said complimentary connection means exposed, means coupling said body and case and permitting manual manipulation of the case, without contact of the fingers of the user with said body, said cartridge and said needle, for assembly of the complimentary connection means of said syringe body with the connection means of said syringe head, and a detachable support mounted on the case and covering the rest of said syringe body, said support being separable from the case thus exposing the complimentary connection means for successive attachment of sterile syringe bodies with the same syringe head.