Sealed surgical access device

A surgical access device adapted to facilitate access through an incision in a body wall and into a body cavity of a patient, the body wall having an inner surface and an outer surface, the device comprising;

• a first retention member sized and configured to surround the incision in proximity to the outer surface of the body wall;
• a second retention member sized and configured to surround the incision in proximity to the inner surface of the body wall;
• a membrane extending between the first retention member and the second retention member, the membrane forming a throat adapted for disposition through the incision, the membrane forming a first funnel extending from the first retention member into the throat, and the membrane forming a second funnel extending from the second retention member into the throat;
• the throat of the membrane having characteristics for forming an instrument seal in the presence of an instrument and a zero seal in the absence of an instrument;
• and
• at least one strap fixed to the first retention member, the strap being sized and configured for disposition around the patient to hold the first retention member in proximity to the outer surface of the body wall.

A surgical access device adapted for disposition through an incision in a body wall, having an outer surface and an inner surface, the device comprising:

• a first retention member adapted for disposition in proximity to the outer surface and surrounding the incision;
• a second retention member adapted for disposition in proximity to the inner surface and surrounding the incision;
• a membrane stretchable between the first retention member and the second retention member to form a working channel, having a shape dependent on the shape of the first retention member;
• the first retention member comprising a ring having a first section with a first end and a second end, and a second section with a third end moveable relative to the first end of the first retention member and a fourth end moveable relative to the second end of the first retention member;
• a coupler disposed between the first end of the first section and the third end of the second section, the coupler being operable to vary the distance separating the first end and the third end to control the shape of the working channel.

A surgical access device adapted to facilitate access through an incision in a body wall and into a body cavity of a patient, the body wall having an inner surface and an outer surface, the device comprising;

• a first retention member sized and configured to surround the incision in proximity to the outer surface of the body wall;
• a second retention member sized and configured to surround the incision in proximity to the inner surface of the body wall;
• a membrane forming a working channel between the first retention member and the second retention member to provide access through the incision and into the body cavity, the membrane having shape dependent upon the shape of the first retention member;
• and
• the first retention member having the shape of a toroid including a circumferential spring and having a volume variable to change the shape of the first retention member with a corresponding change in the shape of the working channel.

A surgical access device adapted to facilitate access through an incision in a body wall and into a body cavity of a patient, the body wall having an inner surface and an outer surface, the device comprising;

• a first retention member sized and configured to surround the incision in proximity to the outer surface of the body wall;
• a second retention member sized and configured to surround the incision in proximity to the inner surface of the body wall;
• a membrane forming a working channel between the first retention member and the second retention member to provide access through the incision and into the body cavity, the membrane having shape dependent upon the shape of the first retention member;
• the first retention member, including a ring with a plurality of retention stations;
• and
• a plurality of tethers attached to the membrane and coupling the membrane to the ring, each of the tethers releasably engaging an associated one of the retention stations at a particular position along the tether providing the membrane with a desired shape.