Patent ID: 8504156

Claim:
An implantable cardiac stimulation device including a pulse generator, a power source, a fixation member, a holding member, and a shell; the shell containing the pulse generator and the power source and extending along a longitudinal axis of the device from a proximal end wall to a distal end wall thereof; the fixation member being located in proximity to the distal end wall; and the holding member comprising: a strut portion spaced apart proximally from the proximal end wall, the strut portion having a span that generally extends in a direction approximately perpendicular to the longitudinal axis of the device; a waist portion defining a recess that extends between the strut portion and the proximal end wall; and an engagement section extending between the strut portion and the waist portion and overhanging the recess; and wherein the engagement section of the holding member extends approximately 360 degrees about a perimeter of the waist portion of the holding member in a plane that lies approximately orthogonal to the longitudinal axis of the device; and wherein the holding member further comprises an open groove extending along the engagement section in a direction approximately parallel with the longitudinal axis of the device.