Abstract: A cardiac pacemaker electrode lead comprising an electrode tip, an electrical conductor electrically coupled to the electrode tip, an insulative sheath covering a portion of the electrical conductor, and a molding member for covering the uninsulated portion of the electrical conductor and including a distal end for forming a first lap joint with the electrode tip and a proximal end for forming a second lap joint with the insulative sheath. Foldable tines are formed on the molding member and when unfolded extend at an angle from the molding member to anchor the electrode tip in trabecular muscles inside the heart. When folded, the tines are received in a recessed portion of the molding member such that the tines are substantially flush with the exterior surface of the lap joints.

Abstract: A J-shaped atrial electrode lead having a pliant tube encasing a spiral wound conductor. A curved, resilient reinforcing member surrounding a portion of the conductor curves the conductor to conform with the shape of the origin of the crista terminalis of the right atrium to position an electrode tip in electrical contact with the junction of the crista terminalis and the superior margin of the right atrial appendage. The lead can be electrically bipolar or unipolar and includes tines adapted for engagement in the right atrial appendage, and an improved proximal portion for connection with a pacemaker circuit module.

Abstract: A medically implantable electrode lead for muscle stimulation comprising an electrode assembly with an exposed conductive distal tip which is coupled by an electrical conductor to a source of electrical pulses. The electrode assembly and electrical conductor are encased in an electrical insulator. The insulator has extending from it a plurality of flexible tines which are adapted to hold the exposed distal tip into position. To facilitate insertion of the distal tip into the desired location, especially when inserting the distal tip through a small opening such as a small vein, the insulator includes a transitional, truncated cone section between the distal tip and the tines. The outside diameter of the distal end of the cone section equals the outside diameter of the distal tip and the outside diameter of the proximal end of the cone section equals the outside diameter of the tines when they are folded into a closed position.