Sealing cannula device

A sealing cannula for inserting through body tissue and forming a passageway through the body tissue for inserting medical instruments, the sealing cannula comprising:

• a hollow cylindrical member having an exterior surface;
• a flange extending from said exterior surface and having a first surface;
• a thread on the exterior surface of said cylindrical member which terminates at a thread end spaced a distance from the first surface of the flange sufficient to accommodate tissue, the thread end having a planar surface substantially parallel to the first surface of said flange to create a seal with the body tissue;
• and
• a hemostasis valve such that an inner lumen of said cylindrical member can be at least partially sealed.

A sealing cannula coupled with a surgical instrument for inserting through body tissue and forming a passageway through the body tissue thereby eliminating a separate attachment means between the surgical instrument and cannula, the sealing cannula comprising:

• a hollow cylindrical member having an exterior surface;
• a surgical instrument having a lower surface;
• and
• a thread on the exterior surface of said cylindrical member which terminates at a thread end spaced a distance from the lower surface of the surgical instrument sufficient to accommodate a layer of body tissue, said thread end having a substantially planar surface substantially parallel to the lower surface of said surgical instrument such that the planar surface of the thread end and the lower surface of the surgical instrument cooperate to compress upon the layer of body tissue when the hollow cylindrical member is threaded into an aperture formed in the layer of body tissue to thereby automatically seal the aperture against leakage along the exterior surface of the cylindrical member.