Hemostasis sheath

Claim 1

A hemostasis cannula comprising: A body having a passage therethrough adapted to receive a catheter; and first, second and third disc-like gaskets mounted in said passage, said first gasket having a slit therein, said second gasket having a hole therein and said third gasket having a flapper therein; said passage having one end adapted to be open to atmosphere and an opposite end adapted to be in communication with a patient's blood vessel; said first gasket being in contact with said second gasket and said second gasket being in contact with said third gasket; said first gasket being located toward said one end and said third gasket being located toward said other end with said second gasket between said first and third gaskets; said flapper being arranged and disposed to open only toward said other end; said second gasket being operable to maintain a sealing relationship with a catheter contained in said passage and, when a catheter is not contained in said passage, said first and second gaskets being operable to close said passage against flow into said blood vessel and said second and third gaskets being operable to close said passage against flow out of said blood vessel.