Medtronic plc has received FDA IDE approval for a pivotal study of its Symplicity Spyral renal denervation (RDN) system in treatment of patients with hypertension. The trial, SPYRAL HTN, is being conducted as part of the firm's multi-phase Spyral HTN global clinical program, which seeks to evaluate the efficacy and safety of its RDN platform. Minimally invasive RDN procedures impact nerves in the kidney that regulate blood pressure, intending to decrease pressure among hypertensive patients. Symplicity Spyral is approved in 50 countries and is an investigational device in Japan and the U.S.