Bag apparatus for transfusion of blood or fluid involving heat shrinkable tube means

Claim 1

A bag apparatus for transfusion of parenteral fluid which comprises: a parenteral fluid transfusing bag made of flexible plastic material, a cylindrical connection mouth member communicating with the bag and having a transverse seal membrane closing the member against passage of fluid, a cannula positioned near the fluid feeding side of the seal membrane for puncture of the seal membrane, a conduit engaging with the fluid outlet of said cannula, a contractable thin walled tube providing a connection between said cannula and said cylindrical connection mouth member, said cannula being positioned within said tube and, a heat shrinkable tube bridging said conduit and said thin walled tube, said heat shrinkable tube and thin walled tube being loosely fitted over the conduit and cannula so as to provide spaces between the heat shrinkable tube and conduit, and between the thin walled tube and cannula to permit sterilizing steam to pass through the spaces into the conduit, said heat shrinkable tube, after sterilization of said apparatus contracting to create fluidtight connection between said conduit and thin walled tube, said cannula having a taper portion on an end thereof which engages with the cylindrical connection mouth member to keep the cannula inserted into the seal membrane.