Medical devices, such as drainage stents, having coiled structures are useful in draining body fluids. A medical device has a first elongated section with a first cross-sectional area and a second elongated section with a second cross-sectional area. The second elongated section extends from the first...http://www.google.com.au/patents/US6332892?utm_source=gb-gplus-sharePatent US6332892 - Medical device with one or more helical coils
