ALEXANDRIA, Va., July 23 -- United States Patent no. 12,364,639, issued on July 22, was assigned to SMITH & NEPHEW INC. (Memphis, Tenn.), SMITH & NEPHEW ORTHOPAEDICS AG (Zug, Switzerland) and SMITH & NEPHEW ASIA PACIFIC PTE. Ltd. (Singapore).

"Weightless traction system" was invented by Daniel Zahynacz (Somerville, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system for translating a constant traction load to an object such as a medical device or a patient includes a plurality of independently rotatable, coaxially aligned spools, each housing a constant force spring fixed at respective ends to the spool and to a rigid member, a plurality of flexible biasing members each coupled on their respective ...