Patent ID: 7076309

Claim:
A lead of an implantable medical device, comprising: an elongated body having a proximal end; a fixation member joined to the elongated body and distally disposed from the proximal end of the elongated body, wherein the fixation member is capable of being extended radially outward from and retracted inward toward the elongated body to provide fixation of a distal part of the elongated body within a portion of a great coronary vein of a subject: a locking mechanism for selectively restricting the fixation member from being extended radially outward from and retracted radially inward toward the elongated body, the locking mechanism comprising: a pin disposed in the fixation member; a plurality of bores disposed in the elongated body such that, as the fixation member is extended outward from and retracted inward toward the elongated body, the pin is capable of slidingly engaging one of the plurality of bores; a spring disposed in the fixation member; and a lever disposed between the spring and the pin such that, as the lever is moved in a first direction, the spring is compressed and the pin is retracted from the bore and, as the lever is moved in a second direction opposite to the first direction, the spring is uncompressed and the pin is extended into the bore.