A system for retrieving an implanted medical device, the implanted medical device comprising an electronic controller, a housing being hermetically sealed and containing the controller and extending over a length from a proximal end thereof to a distal end thereof, and a fixation member mounted to the housing distal end for fixing the device to tissue at the implant site, and the system comprising: an elongate outer tubular member including a longitudinally extending lumen, the longitudinally extending lumen terminating in a distal-most opening that allows passage of the implanted medical device therethrough, and an inner diameter of the longitudinally extending lumen in proximity to the distal-most opening being sized to contain the medical device therein; and a retrieval assembly, the retrieval assembly comprising: a contractible super-elastic net, the contractible super-elastic net defining a longitudinally extending tubular cavity when the contractible super-elastic net expands from a contracted condition thereof, the longitudinally extending tubular cavity extending between a closed end thereof and an open end thereof, the open end of the longitudinally extending tubular cavity being sized to receive passage of the housing therethrough, wherein the contractible super-elastic net, when in a fully expanded condition, has an outer diameter larger than the inner diameter of the elongate outer tubular member in proximity to the distal-most opening, and wherein the contractible super-elastic net, with the device housing contained therein, forms an interference fit within the inner diameter of the elongate outer tubular member; an elongate shaft joined to the contractible super-elastic net in proximity to the closed end thereof; and an elongate retention tube including a second lumen in which the elongate shaft extends in sliding engagement, the elongate retention tube extending within the longitudinally extending lumen of the elongate outer tubular member and including a distal opening, and wherein the second lumen is sized to hold the contractible super-elastic net in the contracted condition therein when the shaft pulls the contractible super-elastic net into the second lumen through the distal opening thereof. an elongate outer tubular member including a longitudinally extending lumen, the longitudinally extending lumen terminating in a distal-most opening that allows passage of the implanted medical device therethrough, and an inner diameter of the longitudinally extending lumen in proximity to the distal-most opening being sized to contain the medical device therein; and a retrieval assembly, the retrieval assembly comprising: a contractible super-elastic net, the contractible super-elastic net defining a longitudinally extending tubular cavity when the contractible super-elastic net expands from a contracted condition thereof, the longitudinally extending tubular cavity extending between a closed end thereof and an open end thereof, the open end of the longitudinally extending tubular cavity being sized to receive passage of the housing therethrough, wherein the contractible super-elastic net, when in a fully expanded condition, has an outer diameter larger than the inner diameter of the elongate outer tubular member in proximity to the distal-most opening, and wherein the contractible super-elastic net, with the device housing contained therein, forms an interference fit within the inner diameter of the elongate outer tubular member; an elongate shaft joined to the contractible super-elastic net in proximity to the closed end thereof; and an elongate retention tube including a second lumen in which the elongate shaft extends in sliding engagement, the elongate retention tube extending within the longitudinally extending lumen of the elongate outer tubular member and including a distal opening, and wherein the second lumen is sized to hold the contractible super-elastic net in the contracted condition therein when the shaft pulls the contractible super-elastic net into the second lumen through the distal opening thereof. a contractible super-elastic net, the contractible super-elastic net defining a longitudinally extending tubular cavity when the contractible super-elastic net expands from a contracted condition thereof, the longitudinally extending tubular cavity extending between a closed end thereof and an open end thereof, the open end of the longitudinally extending tubular cavity being sized to receive passage of the housing therethrough, wherein the contractible super-elastic net, when in a fully expanded condition, has an outer diameter larger than the inner diameter of the elongate outer tubular member in proximity to the distal-most opening, and wherein the contractible super-elastic net, with the device housing contained therein, forms an interference fit within the inner diameter of the elongate outer tubular member; an elongate shaft joined to the contractible super-elastic net in proximity to the closed end thereof; and an elongate retention tube including a second lumen in which the elongate shaft extends in sliding engagement, the elongate retention tube extending within the longitudinally extending lumen of the elongate outer tubular member and including a distal opening, and wherein the second lumen is sized to hold the contractible super-elastic net in the contracted condition therein when the shaft pulls the contractible super-elastic net into the second lumen through the distal opening thereof.