A lead
assembly (20) for a small implantable
medical device (10) (a.k.a., microdevice (10) provides means to attach a remote
electrode (14) to microdevice (10), which means inhibit fluid ingress when microdevice (10) is not attached to lead
assembly (20). Microdevices may provide either or both tissue stimulation and sensing. Known microdevices (10) include spaced apart electrodes (12a, 12b) on the outer surface of the microdevice. Lead
assembly (20) includes an insulated lead (16) including a proximal end and a distal end, with at least one conductor therebetween; at least one
electrode (14) at the distal end of the lead and electrically connected to the at least one conductor, and a connector (18) attached to the proximal end of the lead and adapted to be removably connectable to microdevice (10). Connector (18) includes at least one contact (22) to electrically connect at least one device
electrode (12a) on microdevice (10) to at least one conductor, thereby electrically connecting at least electrode (12a) and the at least one electrode (14) at the distal end of lead (16). Lead assembly (20) is configured to inhibit fluid ingress into the connector (18). A number of embodiments of the invention, capable of inhibiting fluid ingress into connector (18), are taught.