Surgical equipment, comprising: an implant comprising: an outer ring having an outer wall and an inner wall, the outer ring disposed about a central axis; an inner ring adjacent to the outer ring inner wall disposed about the central axis defining an annular opening; characterized in that: the implant comprising a plurality of overlapping petals (330A, 330B, 330C, 330D) flexibly attached to the inner ring disposed about the central axis, the petals substantially occluding the annular opening in a first state and elastically opening to provide a variably sized bore in a second state; the surgical equipment comprising an apparatus for deploying the implant, the apparatus comprising: a flexible shaft having a proximal end and a distal end; an actuation sheath disposed about the flexible shaft, the actuation sheath having a proximal end and a distal end, the shaft and actuation sheath together having a diameter suitable to fit down an endoscope channel; a first pair and a second pair of arms disposed in a staggered arrangement about the actuation sheath's distal end, the pairs of arms having proximal ends and distal ends, the arms' proximal ends movably attached to the actuation sheath's distal end; bladders attached to the pairs of arms' distal ends; and a tube extending down the flexible shaft in fluid communication with the bladders; the annular opening of the implant being capable of placement on the distal end of the flexible shaft such that the bladders are adjacent the outer ring inner wall and the outer ring of the implant is medially folded, wherein the first pair and the second pair of arms are configured to be extended to expand the implant to contact an interior lumen wall and the bladders are configured to be inflated via the tube to move the outer ring into contact with the interior lumen wall; an endoscope; the flexible shaft being loadable into the endoscope such that the endoscope, the flexible shaft and the implant can be inserted into a biological lumen. an implant comprising: an outer ring having an outer wall and an inner wall, the outer ring disposed about a central axis; an inner ring adjacent to the outer ring inner wall disposed about the central axis defining an annular opening; an outer ring having an outer wall and an inner wall, the outer ring disposed about a central axis; an inner ring adjacent to the outer ring inner wall disposed about the central axis defining an annular opening; characterized in that: the implant comprising a plurality of overlapping petals (330A, 330B, 330C, 330D) flexibly attached to the inner ring disposed about the central axis, the petals substantially occluding the annular opening in a first state and elastically opening to provide a variably sized bore in a second state; the surgical equipment comprising an apparatus for deploying the implant, the apparatus comprising: a flexible shaft having a proximal end and a distal end; an actuation sheath disposed about the flexible shaft, the actuation sheath having a proximal end and a distal end, the shaft and actuation sheath together having a diameter suitable to fit down an endoscope channel; a first pair and a second pair of arms disposed in a staggered arrangement about the actuation sheath's distal end, the pairs of arms having proximal ends and distal ends, the arms' proximal ends movably attached to the actuation sheath's distal end; bladders attached to the pairs of arms' distal ends; and a tube extending down the flexible shaft in fluid communication with the bladders; a flexible shaft having a proximal end and a distal end; an actuation sheath disposed about the flexible shaft, the actuation sheath having a proximal end and a distal end, the shaft and actuation sheath together having a diameter suitable to fit down an endoscope channel; a first pair and a second pair of arms disposed in a staggered arrangement about the actuation sheath's distal end, the pairs of arms having proximal ends and distal ends, the arms' proximal ends movably attached to the actuation sheath's distal end; bladders attached to the pairs of arms' distal ends; and a tube extending down the flexible shaft in fluid communication with the bladders; the annular opening of the implant being capable of placement on the distal end of the flexible shaft such that the bladders are adjacent the outer ring inner wall and the outer ring of the implant is medially folded, wherein the first pair and the second pair of arms are configured to be extended to expand the implant to contact an interior lumen wall and the bladders are configured to be inflated via the tube to move the outer ring into contact with the interior lumen wall; an endoscope; the flexible shaft being loadable into the endoscope such that the endoscope, the flexible shaft and the implant can be inserted into a biological lumen.