Abstract: Self sealing cannula automatically maintains insufflation pressure in a body cavity. A slotted elastomeric valve is positioned in the valve seat with the slot disposed over the passage. The elastomeric valve is compressed to seal the slot, thus sealing the cannula passage.A surgical instrument such as a trocar or laparoscope may be slid through the cannula passage, which remains sealed regardless of the presence or absence of the surgical instrument within the passage.
January 18, 1978
Date of Patent:
December 11, 1979
William R. Knepshield, Jerry Polizzi, Allen H. Okamoto