Ventritex, Inc.

Mary E Bush

Eric Steven Fain

Thomas A Howell

Craig E Mar

A system is provided for fastening an implantable medical device, for example a defibrillator lead, to the heart. A lead electrode is placed in a desired position against the pericardium, pericardial tissue is grasped with a fastening tool, and the pericardial tissue is drawn away from epicardium and toward the fastening tool. A fastening member is applied to the pericardial tissue and to the lead electrode to secure the lead in the desired position. The application tool comprises a first pair of jaws for grasping membranous tissue and drawing the tissue away from other tissues and toward the tool. A second pair of jaws is provided for holding fastener members and delivering the fastener members to the membranous tissue.

Double jaw apparatus for attaching implanted materials to body tissue

An implantable defibrillator lead comprises a flexible, conductive lead member having proximal and distal end portions. The distal end portion defines a plurality of separate, curvilinear electrodes which naturally extend laterally outwardly in a curved arrangement from the remainder of the lead. However, by desired means, the curvilinear electrodes may be temporarily extended out straight, substantially parallel to the axis of the remainder of said lead member, to facilitate implantation of the lead. This may be preferably accomplished by a flexible sheath that encloses the lead member in longitudinally slidable relation.

Multiple electrode deployable lead

A lead or other member may be implanted into the body, and typically at the heart, by a method which comprises and following: inserting one of a pair of pivotally attached jaws of an attachment tool through a hole in a body membrane, particularly the parietal pericardium surrounding the pericardial cavity. The other of the pivotally related jaws is placed outside of the body membrane in a position of registry with the first of the jaws. The jaws carry an attachment member which is to be attached for securance to the body membrane. The jaws are brought together in pressing relation with the membrane and attachment member positioned between the jaws, to cause attachment of the attachment member to the membrane. The lead may be pre-attached, or subsequently attached, to the attachment member after the above process steps.

Implantation of leads

An electrode on a lead may be implanted at the heart by placing the lead through a hole in the parietal pericardium and positioning the distal end of the lead in a desired position relative to the heart. Thereafter one secures the lead in the desired position by attachment thereof to a fastener member, including the step of attaching the fastener member to the parietal pericardium by compressive action between a pair of opposed jaws of an attachment tool, with one of the jaws being positioned within and the other of the jaws positioned outside of the parietal pericardium. Also, a tool is disclosed for securing leads to a tissue site, particularly in accordance with the above method.

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Fremont, CA, United States of America

Mary E Bush