Patent ID: 8364278

Claim:
A lead assembly for attachment to a small, implantable leadless medical device including a distal device electrode and a proximal device electrode disposed on opposing ends of the medical device, the lead assembly comprising: an insulated lead including a proximal end and a distal end, with at least one conductor therebetween; at least one electrode at the distal end of the lead and electrically connected to the at least one conductor; and a connector attached to the proximal end of the lead and adapted to be removably connectable to, and substantially entirely cover, the distal device electrode of the medical device, wherein the connector includes at least one contact to electrically connect the distal device electrode to the at least one conductor, wherein the lead assembly comprises a closure as part of the connector, wherein the closure inhibits fluid ingress into a portion of the connector that receives the distal device electrode, the closure collapsing and sealing when the distal device electrode of the medical device is not present in the connector.