Abstract: A cannula cap for sealing a cannula assembly during insufflatory surgery, the cap comprising an endwall made of elastomeric material and a sidewall. The cap is sized and configured to fit to the instrument entrance of a cannula in a relative gas-tight relationship. The endwall of the cap may be apertured to permit entry and exit of a trocar or other surgical instrument without significant interruption of the seal. Another embodiment provides an adaptor cap also comprising an endwall made of an elastomeric material and a sidewall, the adaptor cap arranged to be fitted to the cannula cap for temporary insertion and withdrawal of instruments of relatively small diameter without removal of the cannula cap.

Abstract: A self-sealing cannula assembly for maintaining pressure in a body cavity during insufflatory surgery. A cap made of elastomeric material is fitted to an enlarged portion of a cannula and has means for simultaneous sealing and fastening the cap to the cannula. The endwall of the cap may be apertured to permit entry and exit of a trocar or other surgical instrument without interruption of the seal. Another embodiment provides an elastomeric adaptor cap arranged to be fitted to the exterior circumference of the above-mentioned cap for temporary insertion and withdrawal of instruments of relatively small diameter without removal of the original cap.