Abstract: The present invention relates to multi-layer ceramic packaging of hybrid micro-electronic devices, including those for implantable medical devices. The invention permits size reduction and design simplification in such packaging by eliminating the need for electrolytic or electroless plating, and by eliminating or substantially eliminating the shrinkage variation typically associated with surface metallization techniques.
Type:
Grant
Filed:
April 28, 1997
Date of Patent:
January 5, 1999
Assignee:
Medtronic, Inc.
Inventors:
Samuel F. Haq, Patrick F. Malone, John H. Fortney, Donald P. Varner
Abstract: The present invention relates to centerless grinding methods and corresponding devices such as feedthroughs for implantable medical devices and for batteries for implantable medical devices. The present invention provides certain advantages, including the elimination of longitudinal anomalies in drawn wire and increasing the reliability of implantable medical devices. In a method of the present invention, the surface of an over-size medical grade wire having a known anomaly depth is centerless ground to a depth past which those anomalies disappear. Centerless grinding of the present invention may be accomplished using an abrasive wheel and suitable coolant.
Type:
Grant
Filed:
February 11, 1998
Date of Patent:
December 22, 1998
Assignee:
Medtronic, Inc.
Inventors:
William J. Taylor, John D. Wright, Joseph F. Lessar, Gary F. LaBree
Abstract: A pacemaker control method and apparatus for determining the presence of atrial tachyarrhythmias uses a true interval value and compares it to a predetermined tachy value. The true interval value is updated based on the presence of far field R waves in PVARP that meet certain sequencing criteria. The criteria selected allows the control method and apparatus to reduce or eliminate event sequences that will generate false positive tachy detection and subsequent mode switching, while still allowing for the detection of tachy events in PVARP.
Type:
Grant
Filed:
September 29, 1995
Date of Patent:
June 2, 1998
Assignee:
Medtronic, Inc.
Inventors:
Michael F. Hess, H. Toby Markowitz, James W. Busacker, Carleen J. Juran
Abstract: In order to terminate pacemaker-mediated tachycardia (PMT), a pacemaker (or "Pacer") capable of atrial synchronized ventricular pacing, defines a retrograde sensing window after a ventricular paced event. If a preset number of sequential retrograde sensed events occur within this window in consecutive pacing cycles the post ventricular atrial refractory period (PVARP) is extended for one pacing cycle (EXT PVARP) and the pacer will not attempt to interrupt a PMT for a relatively long preset interval thereafter.