Bag-like liquid containers, especially for medical treatment

Claim 1

A bag-like liquid container especially intended for medical purposes welded from at least two layers of flexible flat plastic film joined at their edges to form a bag that is flat when empty, the edges of said layers of plastic film being left unjoined at one point to define an aperture in the container, and at least one closable cylindrical spout extending through said aperture in said container and intended for filling or emptying the container, said spout having its center line substantially in the plane of the container when said container is in a flat condition, said spout provided with a bowl-shaped flange formed integral with said spout, the surface of said flange merging with the outside of said spout engaging against and welded to the interior face of said layers of plastic film so as to provide a completely impervious attachment of the spout to the container as well as a separation of the sides of the container such that the liquid flowing into and out of the container is always guaranteed a free passage, the radial cross-sectional thickness of said bowl-shaped flange diminishing toward the outer periphery of said flange.