US Patent 11839404 Surgical access assembly having pre-filled air chamber

A surgical access assembly includes an elongated cannula member having a proximal end portion and a distal end portion, a balloon anchor coupled to the distal end portion of the elongated cannula member, a sleeve of the balloon anchor extending proximally along an outer surface of the elongated cannula member, a chamber defined between the sleeve of the balloon anchor and the outer surface of the elongated cannula member, and a first collar is coupled to the elongated cannula member. The first collar is slidable along the elongated cannula member and engageable with the sleeve of the balloon anchor.