Patent ID: 8882737

Claim:
A self-standing bag filled with a liquid dialysate for making dialysate for a dialysis treatment comprising: a self-standing bag made of two flexible elastomeric rectangular side wall sheets, each side wall sheet having horizontal top and bottom edges and two vertical edges, and one flexible elastomeric rectangular bottom wall sheet having two horizontal edges and two vertical edges; said two rectangular side wall sheets being sealed to one another along their vertical edges in a lateral two-layer part of said bag; the two vertical edges of said bottom wall sheet being sealed to adjacent vertical edge parts of said side wall sheets and said two horizontal edges of said bottom wall sheet being sealed to adjacent horizontal bottom edges of the side wall sheets in a lateral four-layer part of the bag, said sealing of the side wall sheets to each other and to the bottom wall sheet defining a maximum sealed volume of an interior of said bag; the bag when empty capable of a flat configuration in which the bottom wall sheet is sandwiched between the two side wall sheets, the bottom wall sheet is symmetrically single-folded parallel to the bottom wall sheet horizontal edges, and the horizontal edges of the bottom wall sheet coincide with the horizontal bottom edges of the two side wall sheets, the bag when empty and in the flat configuration thus having a line separating said lateral four-layer part and said lateral two-layer part; said bag further including first sloped sealing lines on each side of the bag joining the side wall sheets in the lateral two-layer part between first points (A′, A″) on the horizontal top edges of the side wall sheets, that are recessed by a first distance (a) from the sealed vertical edges of the side wall sheets, and second points (B′, B″) that are recessed by a second distance (b) from the sealed vertical edges of the side wall sheets and that are positioned on the line separating the lateral two-layer part from the lateral four-layer part, the second distance being less than the first distance, said first sloped sealing lines reducing the maximum sealed volume of said bag interior; said bag still further including second sloped sealing lines joining each side wall sheet and the neighbouring bottom wall sheet in the lateral four-layer part on each side of the bag, between third points (C 1 ′, C 1 ″; C 2 ′, C 2 ″) on the horizontal bottom edges of the side wall sheets, that are recessed by a third distance (c) from the sealed vertical edges of the side wall sheets and the second points (B′, B″), said second sloped sealing lines further reducing the maximum sealed volume of said bag interior; and a liquid dialysate including 3 to 8 liters of an acidic part of liquid dialysate concentrate contained within said bag.