Abstract: A cannula, a straightener, and a cannula and straightener combination for insertion into tissue, the cannula including an elongated rigid hollow tube having a proximal end, a distal end, and a passageway extending therebetween. The distal end includes a memory of directionality to bend about a radius. The cannula straightener straightens the distal end of the cannula when inserted through the passageway of the cannula. The present invention also includes methods of inserting a cannula, removing a cannula, and performing surgery with a cannula in tissue or in fetal tissue. The present invention further includes methods of performing biliary cannulation in a transhepatic approach, performing fetal aortic valvuloplasty, placing catheters into the brachial plexus for pain management, placing catheters into the epidural space for anesthesia, thoracic dissection treatment, laparoscopic dissection, and hydro dissection of tissue.

Abstract: A cannula, a straightener, and a cannula and straightener combination for insertion into tissue, the cannula including an elongated rigid hollow tube having a proximal end, a distal end, and a passageway extending therebetween. The distal end includes a memory of directionality to bend about a radius. The cannula straightener straightens the distal end of the cannula when inserted through the passageway of the cannula. The present invention also includes methods of inserting a cannula, removing a cannula, and performing surgery with a cannula in tissue or in fetal tissue. The present invention further includes methods of performing biliary cannulation in a transhepatic approach, performing fetal aortic valvuloplasty, placing catheters into the brachial plexus for pain management, placing catheters into the epidural space for anesthesia, thoracic dissection treatment, laparoscopic dissection, and hydro dissection of tissue.