ALEXANDRIA, Va., May 26 -- United States Patent no. 12,636,434, issued on May 26, was assigned to NxStage Medical Inc. (Lawrence, Mass.).

"Flow restriction devices, methods, and systems" was invented by Eric Zoglio (Derry, N.H.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A flow restrictor includes a flexible tube held in a housing and a linear actuator connected through an intermediate link to a distal link via a first revolute joint proximate the linear actuator and a second revolute joint connecting the intermediate and distal links. The distal link has a distal end adjacent the flexible tube and the intermediate and distal links are constrained to move such that when the linear actuator moves the first...