the following description of the embodiment ( s ) is merely exemplary in nature and is in no way intended to limit the invention , its application , or uses . referring to the drawings , an apparatus for implanting a suture anchor and delivering biologic material is shown and generally identified at reference 10 . the apparatus 10 generally includes a delivery structure 12 having a distal end 14 for locating with a bone hole b of a bone 15 and a proximal end 16 for receiving the biologic material 18 thereat ( fig5 a ). a plunger 20 slidably communicates with the delivery structure 12 to urge the biologic material 18 toward the distal end 14 . the delivery structure 12 according to the present teachings is operable to cooperate with an anchor member 26 ( fig5 a ) and suture 30 coupled to and extending from the anchor member 26 . specifically , as will be described in greater detail herein , the delivery structure 12 facilitates injection of the biologic material 18 around the anchor member 26 in the bone hole b while protecting the suture 30 from contact with the biologic material 18 during injection . the biologic material 18 may comprise a biocompatible adhesive or sealant including homopolymers and copolymers of epsilon - caprolactone , lactide , glycolide , para - dioxanone and trimethylene carbonate or other adhesive composition that is biocompatible . the polymers may be blended with synthetic calcium containing bone regenerating materials such as hydroxyapatite , calcium phosphates and bioactive glasses . the delivery structure 12 generally includes a first or inner longitudinal member 34 defining an inner cavity 36 extending between the distal and proximal ends 14 and 16 and a second or outer longitudinal member 44 disposed around the inner longitudinal member 34 and extending between the distal and proximal ends 14 and 16 . the inner and outer longitudinal members 34 and 44 are offset a predetermined distance by supports 46 ( best shown in fig3 ) extending between the inner and outer longitudinal members 34 and 44 , respectively . the inner and outer longitudinal members 34 and 44 define an outer cavity 48 therebetween . the inner and outer longitudinal members 34 and 44 are illustrated as tubular members having circular cross sections and defining an annular space at the outer cavity 48 . as such , the detailed discussion herein is directed to longitudinal members defining circular cross sections . it is contemplated , however , that the longitudinal members may comprise any cross sectional shape , such as , but not limited to rectangular and oval . with particular reference to fig3 - 5a , the distal end 14 of the delivery structure 12 provides an annular shoulder portion 50 formed on the outer longitudinal member 44 . the shoulder portion 50 defines an annular ledge 52 and a radial wall 54 . the shoulder portion 50 provides a relief for the delivery structure 12 to locate properly with respect to the bone hole b during injection of the biologic material 18 . the annular space defined between the radial wall 54 and the inner longitudinal member 34 defines an insert portion 58 ( fig5 a ). as will be described , the insert portion 58 is adapted to nest partially into the bone hole b while the shoulder portion 50 rests around the surface surrounding the bone hole b . an inlet port 60 is incorporated on the outer longitudinal member 44 for delivering the biologic material 18 into the outer cavity 48 . the biologic material 18 may be introduced into the outer cavity 48 at the inlet port 60 by a delivery device 64 such as a syringe 66 and plunger 68 assembly . it is appreciated that the biologic material 18 may be introduced into the outer cavity 48 by any other suitable method . for example , the biologic material 18 may be introduced at the opening 70 ( fig1 ) defined between the inner and outer longitudinal members 34 and 44 at the proximal end 16 of the delivery structure 12 . in that scenario , the plunger 20 would be withdrawn from the outer cavity 48 to allow the biologic material 18 to be introduced into the outer cavity 48 . once the desired amount of biologic material 18 is introduced into the outer cavity 48 , the plunger 20 may be relocated into slidable communication with the delivery structure 12 . turning now to fig2 and 3 , the plunger 20 will be described in greater detail . the plunger 20 generally defines a structure suitable for slidable communication within the outer cavity 48 . the plunger 20 includes a main body portion 76 , a handle member 80 formed on a proximal end 82 and an engagement portion 88 formed on a distal end 90 . the engagement portion 88 defines a geometry suitable for cooperating with the shoulder portion 50 defined by the outer longitudinal member 44 . the plunger 20 defines longitudinal wing portions 92 for providing structural support for the delivery structure 12 while slidably communicating with the inner and outer longitudinal members 34 and 44 respectively during operation . it is appreciated that while the plunger 20 is depicted as having four wing portions 92 , any number of wing portions 92 may be included . with reference now to fig4 - 5b , a method for implanting a suture anchor 26 and biologic material 18 according to the present teachings will be described . at the outset , a bone hole b , fig5 a ( or b ′, fig5 b ) is prepared in the bone 15 . as illustrated , a bone hole b having a consistent diameter , or a bone hole b ′ having a reduced diameter at the bone surface is formed . the bone hole b ′ illustrated in fig5 b defines a first inner diameter 94 and a second inner diameter 96 . the first inner diameter 94 presents a radial ledge 98 for providing increased retention properties for the anchor 26 within the bone hole b ′. specifically , an anchor 26 may be selected having ribs 104 extending radially around the anchor 26 a distance defining an outer diameter greater than the inner diameter 94 of the bone hole b ′. once the bone hole b or b ′ is prepared , the anchor 26 having a suture 30 extending therefrom is located with respect to the delivery structure 12 . in this regard , the suture 30 is passed through the inner cavity 36 of the delivery structure 12 and the anchor 26 is drawn into engagement with the distal end 14 of the delivery structure 12 . it is appreciated that while the suture 30 is shown passed through an opening at the proximal end 82 of the plunger 20 , the suture 30 may alternately be passed out of the plunger 20 between adjacent wing portions 92 near the distal end 90 of the plunger 20 . next , the distal end 14 of the delivery structure 12 is located relative to the bone hole b or b ′. specifically , the insert portion 58 is located into a nesting relationship with the bone hole b or b ′ while the shoulder portion 50 supports the delivery structure 12 into a substantially upright , stable position relative to the bone 15 . at this point , the biologic material 18 is introduced into the outer cavity 48 of the delivery structure 12 . as previously described , one method for doing so is to inject the biologic material 18 into the outer cavity 48 via the port 60 formed on the outer longitudinal member 44 . once the desired amount of biologic material 18 is injected into the outer cavity 48 , the delivery device 64 is removed from engagement with the outer longitudinal member 44 . next , the plunger 20 is slidably actuated toward the bone hole b or b ′ whereby the biologic material 18 is expelled from the distal end 14 of the delivery structure 12 and into the bone hole b or b ′ around the anchor 26 . the delivery structure 12 is subsequently removed from the bone hole b or b ′ allowing the suture 30 to slidably retreat from the inner cavity 36 through the distal end 14 of the delivery structure 12 . at this point , the anchor 26 and biologic material 18 are located within the bone hole b or b ′ and the suture 30 , free of biologic material 18 , may be used for its desired function . with reference to fig5 b , the anchor 26 is shown in an implanted position with respect to the bone hole b ′. it is appreciated that a delivery structure 12 would be provided having an outer diameter compatible with the inner diameter 94 of the bone hole b ′. it is also appreciated that the anchor 26 may be implanted into the bone hole b ′ before utilizing the apparatus 10 . in this regard , the suture 30 , extending from a pre - installed anchor 26 , may be passed through the inner cavity 36 of the delivery structure 12 , the delivery structure located for communication with the bone hole b ′, and biologic material 18 expelled into the bone hole b ′ around the anchor 26 . while the invention has been described in the specification and illustrated in the drawings with reference to various embodiments , it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention as defined in the claims . furthermore , the mixing and matching of features , elements and / or functions between various embodiments is expressly contemplated herein so that one of ordinary skill in the art would appreciate from this disclosure that features , elements and / or functions of one embodiment may be incorporated into another embodiment as appropriate , unless described otherwise above . moreover , many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof . therefore , it is intended that the invention not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this invention , but that the invention will include any embodiments falling within the forgoing description and the appended claims .
an apparatus and method for delivering biologic material to a bone hole includes a delivery structure defining a proximal end and a distal end . the delivery structure includes a first longitudinal member defining a first cavity and extending between the distal and proximal end . a second longitudinal member is disposed around the first longitudinal member and extends between the distal and proximal end . the first and second longitudinal members define a second cavity therebetween . the first cavity is adapted to receive a flexible member therethrough . the second cavity is adapted to receive the biologic material and deliver the biologic material out of the distal end into the bone hole . the first longitudinal member precludes the biologic material from contacting the flexible member while the biologic material is delivered to the bone hole .