A medical device having enhanced ultrasonic visibility is provided. The device permits localized drug delivery, probe positioning, fluid drainage, biopsy, or ultrasound pulse delivery, through the real-time ultrasound monitoring of the needle tip position within a patient. The device permits controlled...http://www.google.com/patents/US20070197954?utm_source=gb-gplus-sharePatent US20070197954 - Medical devices with enhanced ultrasonic visibilty
