Patent ID: 7809447

Claim:
An implantable medical electrode device, or a cardiovascular cardiac pacemaker or defibrillator electrode device, comprising: an electrode body ( 2 ) that is elongate and tubular; an externally closed peripheral wall ( 8 ) coupled with said electrode body ( 2 ); a fixing zone ( 4 ) in front of a distal end ( 3 ) of said electrode body ( 2 ), wherein said fixing zone ( 4 ) is configured to be reversibly expandable and is configured to detachably fix an electrode device ( 1 ) in a body lumen; expansion means situated in said fixing zone ( 4 ) and configured to control expansion and contraction in said fixing zone ( 4 ); wherein said fixing zone ( 4 ) is configured to snap into a stationary expanded fixing state through application of force at a first location of said electrode body ( 2 ) and is configured to snap into a contracted starting state through application of force at a second location of said electrode body ( 2 ); and, wherein said peripheral wall is provided with at least one mechanically expanding, bistable tilting element ( 33 ) in said wall in an area of said fixing zone ( 4 ), wherein said bistable tilting element ( 33 ) comprises two stable positions that define the stationary expanded fixing state and the contracted starting state of said fixing zone ( 4 ) and wherein said bistable tilting element ( 33 ) is configured to maintain each of said two stable positions without the application of force applied to said bistable tilting element at said first location or said second location of said electrode body ( 2 ) when said expansion means is removed from said fixing zone ( 4 ).