Patent ID: 7647109

Claim:
A system comprising: a percutaneous first intravascular elongate member configured with a proximal end and a distal end and sized and shaped to define a lumen passing therethrough; a percutaneous second intravascular elongate member configured with a proximal end and a distal end; a wireless electrostimulation electrode assembly configured with a mechanical coupling to the distal end of the second intravascular elongate member, wherein when the wireless electrostimulation electrode assembly is detachably mechanically coupled to the second intravascular elongate member, the second intravascular elongate member and the wireless electrostimulation electrode assembly are sized and shaped to be passable through the lumen; wherein the second intravascular elongate member is configured to intravascularly and percutaneously deliver at least a portion of the wireless electrostimulation electrode assembly from within a heart through an endocardium and into a myocardium of the heart; wherein the wireless electrostimulation electrode assembly includes a tissue attachment mechanism configured to secure at least a portion of the wireless electro stimulation electrode assembly to the myocardium, the tissue attachment mechanism including a distally extending helical tine, and a plurality of radially extending curled tines, the helical tine configured to penetrate through the endocardium and into the myocardium, and the plurality of curled tines configured to penetrate into the myocardium without penetrating the epicardial wall; and wherein the curled tines include a retracted configuration and a user-actuatable extended configuration, and wherein the curled tines are configured to be in the retracted configuration when the helical tine is introduced into the myocardium, and wherein the curled tines are user-actuatable to radially extend after the helical tine has been introduced into the myocardium.