Patent ID: 7819800

Claim:
A surgical access device, comprising: a tubular diaphragm; a first annular member circularly coupled to a first end of the tubular diaphragm; a second annular member circularly coupled to a second end of the tubular diaphragm, wherein the second annular member is selectively rotatable relative to the first annular member; a third annular member configured to selectively engage the second annular member to restrict rotation of the second annular member relative to the first annular member, wherein the third annular member is selectively rotatable relative to the first annular member, wherein the third annular member is further configured to selectively engage the first annular member to restrict rotation of the third annular member relative to the first annular member, wherein the first, second, and third annular members are aligned along a common axis; a housing aligning the first and second annular members for relative rotation between an open condition and a closed condition of the tubular diaphragm, wherein the first annular member is fixed relative to the housing; and a closing biasing member connected between the housing and the third annular member, wherein the closing biasing member resiliently biases the third annular member to engage the second annular member to impart a closing rotation to the second annular member to effect the closed condition of the tubular diaphragm; wherein the second annular member is rotatable relative to the first and third annular members to disengage the third annular member from the first annular member, wherein the third annular member is configured to drive the second annular member to a closed rotational position in response to the resilient bias from the closing biasing member when the third annular member is disengaged from the first annular member by rotation of the second annular member, further comprising an opening biasing member coupled between the first and second annular member operatively configured to store energy to impart an opposite opening relative rotation between the first and second annular member.