A tubular medical device, such as an elongate catheter is provided. The catheter includes an anchor mechanism with two or more arms biased toward an expanded position and can be urged toward a narrower insertion position. Each of the two or more arms are fixed to the tube proximate a nonexpandable distal tip of the tube and to the central portion of the tube. A biasing member is disposed in conjunction with the anchor mechanism, the biasing member is connected to the tube at the central portion proximate to a position where the two or more arms connect to the tube and is also connected to the tube proximate to the distal tip. The biasing member urges the two or more arms toward the expanded position.
