ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,521,132, issued on Jan. 13, was assigned to Penumbra Inc. (Alameda, Calif.).

"Apparatus and methods for controlled clot aspiration" was invented by Scott Teigen (West Fargo, N.D.), Steven Loisel (Castro Valley, Calif.), Stephen Pons (Alameda, Calif.) and Ben Tompkins (Danville, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A blood clot removal system including an aspiration catheter, an external unit having a first pressure sensor, a base unit having a second pressure sensor, a vacuum source connected to the base unit, connection tubing connecting the external unit to the aspiration catheter and the base unit, controllable sensory indicators, an...