An elongated implantable medical device for delivering electrical stimulation pulses to a patient includes a housing having a housing proximal end and a housing distal end and an electrical conductor having a conductor proximal end and a conductor distal end. The conductor distal end extends from the housing proximal end. The housing has a first fixation force at a first implant site after being implanted in a patient's body, and the conductor proximal end has a second fixation force at a second implant site after being implanted in a patient's body. The second fixation force is different than the first fixation force.
