ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,533,449, issued on Jan. 27, was assigned to NxStage Medical Inc. (Lawrence, Mass.).

"Methods, devices, and systems for providing peritoneal dialysis fluid from powdered concentrate" was invented by Mark T. Wyeth (Andover, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A proportioning system includes a solute container filled with dry solutes, a source of water, a container of electrolyte concentrate, a fluid circuit connecting the solute container to the source of water and the container of electrolyte concentrate, the fluid circuit having an empty mixing container, a controller configured to transfer water from the source of water to the solute c...