David M Swanson

US Patent:

52033481, Apr 20, 1993

Filed:

Jun 6, 1990

Appl. No.:

7/533886

Inventors:

Roger W. Dahl - Andover MN
David K. Swanson - Roseville MN
Stephen J. Hahn - Roseville MN
Douglas J. Lang - Arden Hills MN
John E. Heil - St. Paul MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 105

US Classification:

128784

Abstract:

Implantable electrodes for defibrillation are formed of pluralities of electrode segments. Each of the segments is relatively long and narrow. The electrode segments can be parallel and spaced apart from one another a distance at least ten times the nominal width, with one end of each segment mounted to a transverse distal portion of an electrically conductive lead coupling the electrode to a defibrillation pulse generator. Alternatively, segments can branch or radiate outwardly from a common junction. In yet another arrangement, electrode segments are portions of a single conductive path at the distal end of a lead from a pulse generator, arranged in either a spiral configuration or a serpentine configuration which can align electrode segments side by side, parallel and spaced apart. The electrode segments can be formed of composite conductors in the form of titanium ribbons or wires with a sputtered outer layer of platinum, or a silver core in a stainless steel tube, with a platinum layer formed onto the tube. The electrodes are highly compliant yet can provide large effective areas for defibrillation, enabling a transthoracic pulsing arrangement of two electrodes on opposite sides of the heart, implanted subcutaneously outside of the thoracic region.

US Patent:

53424077, Aug 30, 1994

Filed:

Jul 13, 1992

Appl. No.:

7/912924

Inventors:

Roger W. Dahl - Andover MN
David K. Swanson - Roseville MN
Stephen J. Hahn - Roseville MN
Douglas J. Lang - Arden Hills MN
John E. Heil - St. Paul MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 139

US Classification:

607129

Abstract:

Implantable electrodes for defibrillation are formed of pluralities of electrode segments. Each of the segments is relatively long and narrow. The electrode segments can be parallel and spaced apart from one another a distance at least ten times the nominal width, with one end of each segment mounted to a transverse distal portion of an electrically conductive lead coupling the electrode to a defibrillation pulse generator. Alternatively, segments can branch or radiate outwardly from a common junction. In yet another arrangement, electrode segments are portions of a single conductive path at the distal end of a lead from a pulse generator, arranged in either a spiral configuration or a serpentine configuration which can align electrode segments side by side, parallel and spaced apart. The electrode segments can be formed of composite conductors in the form of titanium ribbons or wires with a sputtered outer layer of platinum, or a silver core in a stainless steel tube, with a platinum layer formed onto the tube. The electrodes are highly compliant yet can provide large effective areas for defibrillation, enabling a transthoracic pulsing arrangement of two electrodes on opposite sides of the heart, implanted subcutaneously outside of the thoracic region.

US Patent:

55317790, Jul 2, 1996

Filed:

Jan 24, 1995

Appl. No.:

8/377494

Inventors:

Roger W. Dahl - Andover MN
Robert W. Wickham - late of Harris MN
David K. Swanson - Roseville MN
David Lipson - Poway CA

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 139

US Classification:

607119

Abstract:

Implantable electrode structures for use in apparatus for applying electrical therapy to a patient's heart in the treatment of arrhythmias such as tachycardias and fibrillations of the heart are herein disclosed. The electrode structures are made in the form of expandable (or self-expanding) intravascular stents for insertion through the patient's vascular system to locations in or adjacent the heart. The electrode structures can be inserted into the great veins by insertion techniques used for intravascular stent applications and provide increased electrode surfaces for discharge of electrical energy through the heart in conjunction with other strategically placed electrodes. The wire filament of the stents may be evenly spaced to form a circumferential array or may be non-uniformly spaced to form an elliptical array.

US Patent:

52303373, Jul 27, 1993

Filed:

Jul 14, 1992

Appl. No.:

7/912950

Inventors:

Roger W. Dahl - Andover MN
David K. Swanson - Roseville MN
Stephen J. Hahn - Roseville MN
Douglas J. Lang - Arden Hills MN
John E. Heil - St. Paul MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 139

US Classification:

607 5

Abstract:

Implantable electrodes for defibrillation are formed of pluralities of electrode segments. Each of the segments is relatively long and narrow. The electrode segments can be parallel and spaced apart from one another a distance at least ten times the nominal width, with one end of each segment mounted to a transverse distal portion of an electrically conductive lead coupling the electrode to a defibrillation pulse generator. Alternatively, segments can branch or radiate outwardly from a common junction. In yet another arrangement, electrode segments are portions of a single conductive path at the distal end of a lead from a pulse generator, arranged in either a spiral configuration or a serpentine configuration which can align electrode segments side by side, parallel and spaced apart. The electrode segments can be formed of composite conductors in the form of titanium ribbons or wires with a sputtered outer layer of platinum, or a silver core in a stainless steel tube, with a platinum layer formed onto the tube. The electrodes are highly compliant yet can provide large effective areas for defibrillation, enabling a transthoracic pulsing arrangement of two electrodes on opposite sides of the heart, implanted subcutaneously outside of the thoracic region.

US Patent:

56037325, Feb 18, 1997

Filed:

Nov 6, 1995

Appl. No.:

8/554577

Inventors:

Roger W. Dahl - Andover MN
David K. Swanson - Roseville MN
Stephen J. Hahn - Roseville MN
Douglas J. Lang - Arden Hills MN
John E. Heil - St. Paul MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 105

US Classification:

607129

Abstract:

Implantable electrodes for defibrillation are formed of pluralities of electrode segments. Each of the segments is relatively long and narrow. The electrode segments can be parallel and spaced apart from one another a distance at least ten times the nominal width, with one end of each segment mounted to a transverse distal portion of an electrically conductive lead coupling the electrode to a defibrillation pulse generator. Alternatively, segments can branch or radiate outwardly from a common junction. In yet another arrangement, electrode segments are portions of a single conductive path at the distal end of a lead from a pulse generator, arranged in either a spiral configuration or a serpentine configuration which can align electrode segments side by side, parallel and spaced apart. The electrode segments can be formed of composite conductors in the form of titanium ribbons or wires with a sputtered outer layer of platinum, or a silver core in a stainless steel tube, with a platinum layer formed onto the tube. The electrodes are highly compliant yet can provide large effective areas for defibrillation, enabling a transthoracic pulsing arrangement of two electrodes on opposite sides of the heart, implanted subcutaneously outside of the thoracic region.

US Patent:

53664965, Nov 22, 1994

Filed:

Apr 1, 1993

Appl. No.:

8/041096

Inventors:

Roger W. Dahl - Andover MN
Jayne G. Fangel - White Bear Lake MN
David K. Swanson - Mountain View CA

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 136

US Classification:

607132

Abstract:

A body implantable cardioversion/defibrillation device includes an electrically conductive lead, three lead extensions coupled to the lead through a junction body, and an electrode array consisting of three electrodes, one electrode being coupled to each of the lead extensions. Each electrode has several separate electrically conductive paths, including a primary conductor in the form of a helically wound coil, and a linear shunt conductor in the form of a cable surrounded by the primary coil. The shunt cable is a composite, including a DBS core surrounded by an insulative coating. A dielectric sheath surrounds the shunt cable, preventing the cable from contacting the primary coil and isolating the shunt cable from contact with body tissue or body fluids. At each end of each electrode is a connector structure including a shunt connector attached to an end of the shunt cable, and an outer coil connector surrounding an end of the primary coil and the shunt connector. Both connectors are crimped to maintain the electrical and mechanical coupling.

US Patent:

50904221, Feb 25, 1992

Filed:

Apr 19, 1990

Appl. No.:

7/511068

Inventors:

Roger W. Dahl - Andover MN
Graydon E. Beatty - New Brighton MN
David K. Swanson - Roseville MN
John E. Heil - St. Paul MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 105

US Classification:

128784

Abstract:

A novel method and apparatus for isolating and anchoring an implantable electrically stimulating probe such as a defibrillator patch electrode for use with an automatic cardioverter/defibrillator is disclosed in which a porous bio-compatible coating or enclosure covers and isolates the electrode in a way which allows electrical conductivity via bodily fluid which passes through but separates the electrode from the adjacent tissue in the manner of dissection plane which substantially prevents tissue ingrowth. The coating or enclosure controls the minimum separation distance from the closest tissue and which reduces the local current density applied to adjacent tissue when the electrode is pulsed. The system includes a provision for attaching the enclosure means to internal bodily tissue.

US Patent:

53604423, Nov 1, 1994

Filed:

Jan 4, 1993

Appl. No.:

7/967361

Inventors:

Roger W. Dahl - Andover MN
David K. Swanson - Roseville MN
Stephen J. Hahn - Roseville MN
Douglas J. Lang - Arden Hills MN
John E. Heil - St. Paul MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 105

US Classification:

607129

Abstract:

Implantable electrodes for defibrillation are formed of pluralities of electrode segments. Each of the segments is relatively long and narrow. The electrode segments can be parallel and spaced apart from one another a distance at least ten times the nominal width, with one end of each segment mounted to a transverse distal portion of an electrically conductive lead coupling the electrode to a defibrillation pulse generator. Alternatively, segments can branch or radiate outwardly from a common junction. In yet another arrangement, electrode segments are portions of a single conductive path at the distal end of a lead from a pulse generator, arranged in either a spiral configuration or a serpentine configuration which can align electrode segments side by side, parallel and spaced apart. The electrode segments can be formed of composite conductors in the form of titanium ribbons or wires with a sputtered outer layer of platinum, or a silver core in a stainless steel tube, with a platinum layer formed onto the tube. The electrodes are highly compliant yet can provide large effective areas for defibrillation, enabling a transthoracic pulsing arrangement of two electrodes on opposite sides of the heart, implanted subcutaneously outside of the thoracic region.