1. A device for occlusion of a body lumen comprises an implantableocclusion apparatus (3) operably attached to an elongated catheter member (4)configured for transluminal delivery and deployment of the occlusion apparatusin thebody lumen. The occlusion apparatus comprises a radially expansible element(5)detachably attached to the elongated catheter member, and adjustable between acontracted orientation suitable for 10 transluminal delivery and a deployedorientationconfigured to occlude the body lumen, an energy delivery element (6, 14, 21)configured to deliver energy to surrounding tissue to heat the tissue, and asensor (7)configured to detect a parameter of the wall of the body lumen. The energydeliveryelement (6, 14, 21) and sensor (7) are axially movable independently of theradiallyexpansible element whereby, in use, the energy delivery 15 element and sensorcanbe transluminally retracted leaving the radially expansible element in-situoccludingthe body lumen.
