in the drawings and in the description which follows , in which like reference numerals identify similar or identical elements , the term “ proximal ” will refer to the end of the apparatus that is closest to the clinician during use , while the term “ distal ” will refer to the end that is farthest from the clinician during use , as is traditional and known in the art . with reference to fig1 - 2a , a seal anchor member 100 for use in minimally invasive surgical procedures will now be described . the seal anchor member 100 is configured and adapted to be inserted within tissue tract 12 defined by tissue surfaces 14 formed in tissue “ t ”, e . g ., an incision or a naturally occurring orifice ( e . g ., mouth , anus , or vagina ). seal anchor member 100 defines a longitudinal axis “ a ” and has respective proximal and distal ends 102 , 104 and an intermediate portion 106 disposed between the proximal and distal ends 102 , 104 . as depicted in fig1 - 2a , proximal and distal ends 102 , 104 define substantially planar surfaces . however , embodiments are also contemplated herein in which either or both of proximal and distal ends 102 , 104 define surfaces that are substantially concave or convex to assist in the insertion of seal anchor member 100 within tissue tract 12 . intermediate portion 106 defines a radial dimension “ r ” and extends longitudinally between the proximal and distal ends 102 , 104 to define an axial dimension or length “ l ”. as shown in fig1 - 2a , the radial dimension “ r ” of intermediate portion 106 varies along the length “ l ”, i . e ., the cross - sectional dimension may vary long length “ l ”, to facilitate anchoring of the seal anchor member 100 within tissue “ t ”. however , in an embodiment of the seal anchor member 100 , the radial dimension “ r ” may remain substantially uniform along the length “ l ”. the radial dimension “ r ” of intermediate portion 106 is appreciably less than the respective diameters d 1 , d 2 of proximal and distal ends 102 , 104 such that seal anchor member 100 defines an “ hour - glass ” shape or configuration to assist in anchoring seal anchor member 100 within tissue “ t ”. however , in an alternate embodiment , the radial dimension “ r ” of intermediate portion 106 may be substantially equivalent to the respective diameters d 1 , d 2 of proximal and distal ends 102 , 104 . in cross - section , intermediate portion 106 may exhibit any suitable configuration , e . g ., substantially circular , oval , or oblong . seal anchor member 100 includes a port 101 disposed about a central longitudinal axis “ a ” and will be described in more detail below . it is to be understood that in alternative embodiments , port 101 may be positioned differently , e . g ., not coaxial about central longitudinal axis “ a ” and the seal anchor member 100 may include a plurality of ports . in addition , the seal anchor 100 may be devoid of any port . port 101 in the absence of a surgical object inserted therein is configured and adapted to prevent the escape of insufflation gas through the port 101 . for example , the port 101 may be a slit extending the longitudinal length of the seal anchor member 100 through the proximal and distal ends 102 , 104 . alternatively , port 101 may define an opening within the seal anchor member 100 having an initial open state having a first inner dimension and upon the introduction of a surgical object , the port 101 transitions to a second state having a second inner dimension configured and adapted to accommodate the surgical object such that a substantially fluid - tight seal is formed therewith by substantially approximating the size and shape of the surgical object to inhibit the escape of insufflation gas through the port 101 in the presence of the surgical object . the seal anchor member 100 is configured and adapted to transition between a first state ( fig2 ) and a second state ( fig2 a ) to facilitate insertion of the seal anchor member 100 within tissue “ t ”. as shown in fig1 - 2a , the seal anchor member 100 includes a biasing member “ s 1 ”, e . g ., a spring , that facilitates the transition between a first expanded state shown in fig2 in which the seal anchor member 100 has a length l 1 and a second collapsed state shown in fig2 a in which the seal anchor member 100 has a length l 2 . the biasing member “ s 1 ” is biased towards the expanded state as shown in fig2 . a surgeon may collapse the seal anchor member 100 such that the seal anchor member 100 has a collapsed length l 2 . subsequent to insertion of the seal anchor member 100 , biasing member s 1 will facilitate transition back to the expanded condition in which the seal anchor member has a length l 1 . the seal anchor member 100 will therefore transition toward the expanded condition . the biasing member “ s 1 ” is positioned within the seal anchor member 100 such that the biasing member “ s 1 ” does not interfere with the function of port 101 . it is noted that in other embodiments , the seal anchor member 100 may be biased toward a collapsed state . in an alternative embodiment shown in fig3 - 3a , a seal anchor member 200 having an intermediate portion 206 is shown . a biasing member “ s 2 ” may be disposed on or within a surface 206 a , i . e ., the outer wall , of an intermediate portion 206 extending between proximal rim ( trailing end ) 210 and distal rim ( leading end ) 212 . biasing member “ s 2 ” is configured and adapted to be biased in a direction along longitudinal axis “ b ” to facilitate a transition between an expanded first state and a collapsed second state . the seal anchor member 200 may include a plurality of ports 208 secured to the intermediate portion 206 by connective members 214 such that the longitudinal portion of the ports 208 remain substantially constant with respect to the respective proximal and distal rims 210 , 212 during insertion and removal of the surgical object . it is contemplated that biasing members s 1 , s 2 may be formed from any material and have any configuration such that biasing members s 1 , s 2 will have an internal biasing force . for example , biasing members s 1 , s 2 may be a coiled wire and may be formed from a shape memory material , e . g ., nitinol , such that biasing members s 1 , s 2 provide a bias in a particular direction to facilitate either the compression or expansion of seal anchor members 100 , 200 . although the illustrative embodiments of the present disclosure have been described herein with reference to the accompanying drawings , the above description , disclosure , and figures should not be construed as limiting , but merely as exemplifications of particular embodiments . it is to be understood , therefore , that the disclosure is not limited to those precise embodiments , and that various other changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the disclosure .
a seal anchor member has opposing ends that define a longitudinal axis . the seal anchor member is adapted to transition between an expanded condition and a compressed condition to facilitate securing of the seal anchor member within a tissue tract in a substantially sealed relationship . the seal anchor member includes a biasing member positioned along the longitudinal axis . the biasing member is configured and adapted to facilitate the transition between the expanded and compressed conditions . the seal anchor member further includes at least one lumen extending through the seal anchor member for slidably receiving a surgical instrument .