Abstract: A composite lead body includes a rigid polymer material, such as silicone-polyurethane co-polymers, in a proximal portion of the lead body and a flexible polymer material, such as silicone, in a distal portion of the lead body. The flexible polymer material is molded in-situ about the end of the rigid polymer material, which is pre-formed, forming a junction at which the two polymers are bonded together, preferably in an interdigitated manner. The end of the rigid polymer is treated with a primer in order to facilitate the formation of a strong bond between the polymers. The molding process, advantageously, provides substantial control over the final shape of the molded polymer, inhibiting the formation of discontinuities in the shape of the lead body.

Abstract: A suction cup for use with a delivery device for delivering a cardiac harness to a heart. The suction cup includes a cup body formed of a flexible material, such as silicone, and the cup body has an upper portion and a lower portion, wherein the lower portion defines an opening leading to an inner area of the cup body. The suction cup also includes a connecting aperture formed of a rigid material that is attached to the upper portion of the cup body. The flexible material of the cup body allows the suction cup to rotate relative to the heart tissue, and to re-center itself onto the apex of the heart when the suction cup is improperly aligned with the apex, all while preserving a vacuum attachment to the heart.