A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/17.5
A61N 1/05 (2006.01) A61N 1/36 (2006.01)
Patent
CA 1229884
ABSTRACT Disclosed is a cardiac pacing lead employing an elec- trode which has a novel geometry and which is provided with a coating of platinum black. The electrode is generally hemispher- ical and is provided with grooving. In its preferred embodiment, the electrode is provided with circular grooves and with tines which urge the electrode into contact with the endocardial wall, in a direction roughly perpendicular to the grooves. The elec- trode may be constructed of platinum or of a conductive base metal provided with an external surface of platinum and is preferably coated over its external surface with a coating of platinum black. The grooving of the electrode provides areas of small radius of curvature which contact the endocardial surface, resulting in lo- calized increases in current density at the edges of the grooves. The hemispherical shape of the electrode maximizes the opportunity for contact between the groove edges and the endocardium. In its preferred embodiment, the electrode displays extremely low polar- ization following the application of a stimulation pulse and thereby displays significantly enhanced ability to sense the nat- ural electrical activity of the heart.
452996
Bornzin Gene A.
Medtronic Inc.
Smart & Biggar
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