A medical or surgical device or tool that is designed to be implanted or inserted inside the human or mammalian body, having at least part of its surface coated whereby the ultrasound visibility of said device or tool in vivo is enhanced, wherein the coating comprises one or more of the following: (i)...http://www.google.co.uk/patents/US6749554?utm_source=gb-gplus-sharePatent US6749554 - Medical tools and devices with improved ultrasound visibility
