Patent Publication Number: US-2023149152-A1

Title: Flexible implant with adjustable coils

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application is a continuation of and claims priority to U.S. Pat. Application No. 16/684,578, filed Nov. 14, 2019, and entitled “Flexible Implant With Adjustable Coils,” which is a continuation of and claims priority to U.S. Pat. Application No. 15/863,022, filed Jan. 5, 2018, and entitled “Flexible Implant with Adjustable Coils,” and which issued as U.S. Pat. No. 10,485,652 on Nov. 26, 2019, which is a divisional of and claims priority to U.S. Pat. Application No. 15/001,184, filed Jan. 19, 2016, and entitled “Flexible Implant with Adjustable Coils,” and which issued as U.S. Pat. No. 9,888,998 on Feb. 13, 2018, the contents of each of which are hereby incorporated by reference in their entireties. 
    
    
     FIELD 
     The present disclosure relates to devices and methods for securing soft tissue to bone, and more particularly relates to using flexible implantable bodies in conjunction with a suture filament or repair construct formed to have adjustable coils for use in maintaining a location of a graft with respect to a bone. 
     BACKGROUND 
     Joint injuries may commonly result in the complete or partial detachment of ligaments, tendons, and soft tissues from bone. Tissue detachment may occur in many ways, e.g., as the result of an accident such as a fall, overexertion during a work related activity, during the course of an athletic event, or in any one of many other situations and/or activities. These types of injuries are generally the result of excess stress or extraordinary forces being placed upon the tissues. 
     In the case of a partial detachment, commonly referred to under the general term “sprain,” the injury frequently heals without medical intervention, the patient rests, and care is taken not to expose the injury to undue strenuous activities during the healing process. If, however, the ligament or tendon is completely detached from its attachment site on an associated bone or bones, or if it is severed as the result of a traumatic injury, surgical intervention may be necessary to restore full function to the injured joint. A number of conventional surgical procedures exist for re-attaching such tendons and ligaments to bone. 
     One such procedure involves forming aligned femoral and tibial tunnels in a knee to repair a damaged anterior cruciate ligament (“ACL”). In one ACL repair procedure, a ligament graft is associated with a surgical implant and secured to the femur. A common ACL femoral fixation means includes an elongate, hard, metallic “button,” sometimes referred to as a cortical button, having one or more filaments coupled to it. The one or more filaments can be formed into one or more coils or loops sized to receive the ligament graft(s) and allow an adequate length of the graft(s) to lie within the femoral tunnel while providing secure extra-cortical fixation. During procedures that use cortical buttons, the button is typically flipped after it passed through and out of the bone tunnel (e.g., a femoral tunnel) so that the button lies flat on a cortical surface while keeping the loop(s), and thus the graft(s) associated with the loop(s), in the tunnel. When flipping the button, however, the button can impinge on soft tissue disposed between the button and the bone, which can prevent the button from seating properly on the cortical surface and damage the impinged tissue. Further, it can be difficult to know when to “flip” the button. Current solutions to this problem are to measure a length of the bone tunnel and mark the filament associated with the button to indicate to the surgeon when the button is to be flipped, or providing a large enough opening to dispose a visualization device, like an endoscope or laparoscope, at the surgical site to see when the button exits the tunnel and can be flipped. 
     Another drawback to present devices and methods is that the bone tunnels through which an implant such as a cortical button, and the associated filament(s) and graft(s), pass can often be relatively large to accommodate the size of the implant and the graft(s) at various points during the procedure. A procedure for forming a bone tunnel, such as a femoral tunnel, through which the implant is passed and in which the graft(s) is disposed is illustrated in  FIGS.  1 A- 1 D . A bone  100  in which a tunnel  101  ( FIG.  1 D ) is to be formed is illustrated in  FIG.  1 A . The procedure begins by using a Beath pin to form an initial guide tunnel  102  through an entire thickness of the bone  100 , as shown in  FIG.  1 B , the tunnel  102  having a diameter approximately in the range of about 2 millimeters to about 2.5 millimeters. The Beath pin, which is typically thin and long, can remain disposed within the initial guide tunnel  102  to act as a guidewire to help position additional tools for drilling portions of the tunnel  101  having a larger diameter. 
     A reamer can be passed over the Beath pin to form a larger, passing tunnel  104  through an entire thickness of the bone  100 , as shown in  FIG.  1 C . The previously formed initial guide tunnel  102  is illustrated in  FIG.  1 C  using a dotted line to provide context of a diameter of the passing tunnel  104  as compared to a diameter of the initial guide tunnel  102 . The diameter of the initial guide tunnel  102  is typically too small to have a typical cortical button passed through it, which is why the passing tunnel  104  is formed. A diameter of the passing tunnel  104  can be driven by the size of the width of the cortical button, and thus can be approximately in the range of about 4 millimeters to about 5 millimeters. A portion of the tunnel  101 , as shown in  FIG.  1 D  a distal portion  101   d  that is formed into a graft tunnel  106 , can then be further expanded and sized for having one or more grafts disposed in it. A reamer can be used to form the graft tunnel  106 . The previously formed initial guide and passing tunnels  102 ,  104  are illustrated in  FIG.  1 D  using dotted lines to provide context of a diameter of the graft tunnel  106  as compared to diameters of the initial guide and passing tunnels  102 ,  104 . A diameter of the graft tunnel  106  can be based on the size of the graft(s) to be disposed therein, and can be approximately in the range of about 6 millimeters to about 8 millimeters. 
     Accordingly, it is desirable to have implantable bodies that are designed to sit more consistently and favorably with respect to the cortical surface and not impinge tissue disposed between the body and the bone. It is also desirable to have devices and methods that are designed to limit the number of steps used to form bone tunnels in which the implant(s) and graft(s) are disposed, avoids having to measure and mark components of the implant to assist in visualizing a location of the implant(s), and/or limits the amount of bone removed when forming bone tunnels into which the implants and grafts are passed and/or disposed. 
     SUMMARY 
     Devices and methods are generally provided for performing soft tissue (e.g., ACL) repairs. The devices and methods use flexible and/or soft bodies as the implant or body that ultimately rests against the cortical bone, in conjunction with filament formed into one or more loops or coils to maintain a location of a graft(s) with respect to the flexible and/or soft body, and thus the bone against which the body rests. The designs of the devices and methods provided for in the present disclosure allow for portions of the bone tunnels through which only the implant and not the graft(s) pass to be smaller when compared to existing techniques, and also reduce the possibility of the implant not sitting properly against the cortical bone and/or impinging tissue between the implant and the bone. Additionally, mechanisms for communicating to a surgeon that the flexible and/or soft body has passed through a bone tunnel and can be actuated to set the location of the implant with respect to the bone are also provided. As a result, many of the disclosures provided for herein make it so visualization techniques such as measuring bone tunnels and marking implants, filaments, and/or grafts are no longer necessary. 
     In one exemplary embodiment, a surgical implant includes a flexible filament body and a suture filament extending through the flexible filament body at two or more separate locations on the flexible filament body to form one or more coils. The configuration is such that a portion of each coil is disposed on a top side of the body and a portion of each coil is disposed on a bottom side of the body, with each coil defining an opening for that coil. The suture filament includes a slidable portion formed from the filament. Movement of the slidable portion toward and away from the flexible filament body causes a size of at least one opening of the one or more coils to change. A first and a second location at which the suture filament extends through the flexible filament body are located on opposed sides of the flexible filament body from each other along a length of the flexible filament body with the slidable portion of the suture filament being disposed therebetween. For example, the first location can be disposed on one side along a length of the body, the second location can be disposed on a second, opposed side along the length of the body, and the slidable portion of the suture filament can be disposed between the first and second locations, e.g., approximately at a midpoint along the length of the body. The flexible filament body and the suture filament are configured so application of tension to the one or more coils in a direction away from the flexible filament body causes the flexible filament body to constrict such that the first and second locations on the flexible filament body are located closer together than they were prior to the flexible filament body constricting when the flexible filament body is extended along its length. 
     A tensioning tail can extend from the slidable portion of the suture filament. The tail can be configured to move the slidable portion to change the size of the at least opening of the one or more coils. In some embodiments, the tensioning tail is formed from the suture filament. In such instances, the sliding portion can include a slidable knot that is slidably adjustable by applying tension to the tensioning tail. Further, the slidable knot can be a self-locking knot. 
     A distance extending between terminal, lengthwise ends of the flexible filament body as measured prior to being constricted can be greater than a distance extending between terminal, lengthwise ends of the flexible filament body as measured after the flexible filament body is constricted. The suture filament can include a hollow portion, and a sliding portion can include a portion of the suture filament disposed within the hollow portion. In such embodiments, the portion of the suture filament disposed within the hollow portion can be adjusted by applying tension to the tensioning tail. Further, the suture filament can also include a second hollow portion and a second sliding portion, with the second sliding portion including a portion of the suture filament disposed within the second hollow portion. In such embodiments, the portion of the suture filament disposed within the second hollow portion can be adjusted by applying tension to a second tensioning tail formed from the suture filament. The second tensioning tail can extend from the second sliding portion and can be configured to move the second sliding portion to change the size of at least one opening of the one or more coils. 
     In some embodiments, a pliable feedback unit can be disposed in a portion of the flexible filament body. Alternatively, a pliable feedback unit can be coupled to a terminal end of the flexible filament body. In either instance, the pliable feedback unit can be configured to produce an audible sound and/or tactile feedback when it moves from a bent configuration to a straight configuration. A feedback unit in some embodiments can have a known length extending from a terminal end of the flexible filament body, which can provide information about a location of the flexible filament body in view of the known length of the feedback unit. A feedback unit in some embodiments can be rigid and can be coupled to the flexible filament body by way of a connecting filament. The rigid feedback unit can be configured to engage bone surrounding a tunnel to prevent the suture filament from passing through the tunnel. 
     In another exemplary embodiment, a surgical implant includes a filament body, a suture filament extending through the filament body at two or more separate locations on the filament body to form one or more coils, and a tensioning tail. The filament body has an unstressed configuration, in which a first length of the filament body extends between opposed terminal ends of the filament body. A portion of each coil is disposed on a top side of the body and a portion of each coil is disposed on a bottom side of the body, with each coil defining an opening. The suture filament includes a slidable portion formed from the suture filament. Movement of the slidable portion towards and away from the filament body causes a size of at least one opening of the one or more coils to change. The tensioning tail extends from the slidable portion and is configured to move the slidable portion to change the size of the at least one opening of the one or more coils. Further, the filament body and the suture filament are configured such that the filament body is reconfigurable from the unstressed configuration to an anchoring configuration. More particularly, applying tension to the one or more coils in a direction away from the filament body causes the reconfiguration. In the anchoring configuration, the filament body has a second length that extends between opposed terminal ends of the reconfigured filament body. Both the first and second lengths are measured along a longitudinal axis of the filament body, and the first length is greater than the second length. In other words, the filament body is longer in the unstressed configuration than it is in the anchoring configuration when both lengths are measured along a longitudinal axis. 
     In some embodiments, the tensioning tail can be formed from the suture filament. In such embodiments, the slidable portion can include a slidable knot that is slidably adjustable by applying tension to the tensioning tail. Alternatively, in other such embodiments, the suture filament can include a hollow portion, and the slidable portion can include a portion of the suture filament being disposed within the hollow portion. In such embodiments, the portion of the suture filament disposed within the hollow portion can be adjusted by applying tension to the tensioning tail. Further, the suture filament can also include a second hollow portion and a second slidable portion, with the second slidable portion including a portion of the suture filament disposed within the second hollow portion. In such embodiments, the portion of the suture filament disposed within the second hollow portion can be adjusted by applying tension to a second tensioning tail formed from the suture filament. The second tensioning tail can extend from the second sliding portion and can be configured to move the second sliding portion to change the size of the opening of the one or more coils. 
     In some embodiments, a pliable feedback unit can be disposed in a portion of the filament body. Alternatively, a pliable feedback unit can be coupled to a terminal end of the filament body. In either instance, the pliable feedback unit can be configured to produce an audible sound and/or tactile feedback when it moves from a bent configuration to a straight configuration. A feedback unit in some embodiments can have a known length extending from a terminal end of the filament body, which can provide information about a location of the filament body in view of the known length of the feedback unit. A feedback unit in some embodiments can be rigid and can be coupled to the flexible filament body by way of a connecting filament. The rigid feedback unit can be configured to engage bone surrounding a tunnel to prevent the suture filament from passing through the tunnel. 
     One exemplary embodiment of a surgical method includes loading a graft onto one or more coils of a suture filament that is coupled to a flexible filament body having a shuttle filament extending from it. The shuttle filament is pulled through a bone tunnel, and thus the flexible filament body, the suture filament, and the graft are also pulled at least partially through the bone tunnel. The shuttle filament is pulled until the flexible filament body is pulled out of the tunnel and at least a portion of the suture filament and the graft remain in the tunnel. The flexible filament body is collapsed to draw terminal ends of the body that define a length of the body closer together, thereby placing the flexible filament body in an anchored configuration in which the flexible filament body is disposed on one side of the bone tunnel and the graft is disposed on an opposite side of the bone tunnel. 
     In some embodiments, collapsing the flexible filament body can include applying tension to the one or more coils in a direction away from the flexible filament body, which can cause the flexible filament body to collapse. The suture filament can include a slidable portion formed from the suture filament, and a tensioning tail can extend from the slidable portion. In such embodiments, the method can include applying tension to the tensioning tail to adjust a circumference of one or more coils of the suture filament. When the flexible filament body is pulled out of the tunnel, an audible sound and/or tactile feedback can be generated by a feedback unit associated with the flexible filament body to notify a user that the flexible filament body has passed through the tunnel. In some embodiments, the feedback unit can be disposed in a portion of the flexible filament body, while in some other embodiments, the feedback unit can be coupled to a terminal end of the flexible filament body. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       This invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIGS.  1 A- 1 D  are sequential, schematic, side, cross-sectional views of a prior art method for forming a bone tunnel in a bone for use in conjunction with an ACL repair; 
         FIG.  2    is a side view of one exemplary embodiment of a surgical implant; 
         FIGS.  3 A- 3 C  are sequential, schematic, side, cross-sectional views of one exemplary method for using the surgical implant of  FIG.  2    in conjunction with an ACL repair; 
         FIG.  4    is a side view of another exemplary embodiment of a surgical implant; 
         FIGS.  5 A and  5 B  are sequential, schematic, side, cross-sectional views of one exemplary method for using the surgical implant of  FIG.  4    in conjunction with an ACL repair; 
         FIGS.  6 A- 6 D  are sequential, schematic, side views of one exemplary embodiment for forming a snare in a suture filament of the surgical implant of  FIG.  4   ; 
         FIG.  7 A  is a schematic side view of another exemplary embodiment of a suture filament for use as part of a surgical implant; 
         FIG.  7 B  is a detail view of a coaxial region of the suture filament of  FIG.  7 A  identified by arrow B 1 ; 
         FIG.  8 A  is a side view of one exemplary embodiment of a filament body for use as part of an exemplary embodiment of a surgical implant; 
         FIG.  8 B  is a side view of one exemplary embodiment of a suture filament for use as part of an exemplary embodiment of a surgical implant; 
         FIG.  8 C  is a side view of still another exemplary embodiment of a surgical implant, the implant including the suture filament of  FIG.  8 B  passed through the filament body of  FIG.  8 A , and the implant being in an initial, unactuated configuration; 
         FIG.  8 D  is a side view of the surgical implant of  FIG.  8 C , the implant being in an actuated configuration; 
         FIG.  9 A  is a side view of the surgical implant of  FIG.  8 C  in the initial, unactuated configuration and having a graft associated therewith; 
         FIG.  9 B  is a side view of the surgical implant of  FIG.  9 A  associated with bone and in the actuated configuration; 
         FIG.  10 A  is a side view of yet another exemplary embodiment of a surgical implant; 
         FIG.  10 B  is a detailed, side, cross-sectional view of a portion of the surgical implant of  FIG.  10 A  identified by arrow B 2 ; 
         FIG.  11    is a side view of another exemplary embodiment of a surgical implant, the implant being similar to that of  FIG.  10 A  except the implant of  FIG.  11    includes four coils instead of two coils as provided for in the implant of  FIG.  10 A ; 
         FIGS.  12 A- 12 C  are sequential, schematic, side, cross-sectional views of one exemplary method for using the surgical implant of  FIG.  10 A  in conjunction with an ACL repair, the surgical implant differing from that of  FIG.  10 A  in that it includes a filament tail; 
         FIG.  13    is a perspective view of one exemplary embodiment of a surgical implant having one exemplary embodiment of a pliable feedback unit disposed approximately in a central portion of the implant; 
         FIGS.  14 A- 14 D  are sequential, schematic, side, cross-sectional views of one exemplary embodiment for using the surgical implant of  FIG.  13    in conjunction with an ACL repair; 
         FIG.  15 A  is a side view of one exemplary embodiment of a surgical implant having one exemplary embodiment of a feedback unit disposed approximately at an end of the implant; 
         FIG.  15 B  is a side view of another exemplary embodiment of a surgical implant having another exemplary embodiment of a feedback unit disposed approximately at an end of the implant; 
         FIG.  15 C  is a side view of still another exemplary embodiment of a surgical implant having still another exemplary embodiment of a feedback unit disposed approximately at an end of the implant; 
         FIG.  15 D  is a top view of another exemplary embodiment of a feedback unit configured to be disposed approximately at an end of a surgical implant; 
         FIG.  15 E  is a top view of yet another exemplary embodiment of a feedback unit configured to be disposed approximately at an end of a surgical implant; 
         FIGS.  16 A- 16 E  are sequential, schematic, side, cross-sectional views of one exemplary embodiment for using the surgical implant of  FIG.  15 A  in conjunction with an ACL repair; 
         FIG.  17    is a side view of another exemplary embodiment of a surgical implant having another exemplary embodiment of a feedback unit disposed approximately at an end of the implant; 
         FIGS.  18 A- 18 E  are sequential, schematic, side, cross-sectional views of one exemplary embodiment for using the surgical implant of  FIG.  17    in conjunction with an ACL repair; 
         FIG.  19 A  is a side view of one exemplary embodiment of a surgical implant having an exemplary embodiment of a feedback unit extending distally beyond a distal end of the implant; 
         FIG.  19 B  is a side view of the implant of  FIG.  19 A , the implant having a suture filament passing through a filament body; 
         FIGS.  20 A- 20 E  are sequential, schematic, side, cross-sectional views of one exemplary embodiment for using the surgical implant of  FIG.  19 B  in conjunction with an ACL repair; and 
         FIGS.  21 A- 21 C  are sequential, schematic, side, cross-sectional views of a method for forming a bone tunnel in a bone for use in conjunction with an ACL repair in view of the various surgical implants provided for herein or derivable from the present disclosures. 
     
    
    
     DETAILED DESCRIPTION 
     Certain exemplary embodiments will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the devices and methods disclosed herein. One or more examples of these embodiments are illustrated in the accompanying drawings. Those skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention. Sizes and shapes of the devices, and the components thereof, can depend at least on the anatomy of the subject in which the devices will be used, the size and shape of components with which the devices will be used, and the methods and procedures in which the devices will be used. 
     In the present disclosure, like-numbered components of the embodiments generally have similar features and/or purposes. The figures provided herein are not necessarily to scale, although a person skilled in the art will recognize instances where they are to scale and/or what a typical size is when the drawings are not to scale. Further, to the extent arrows are used to describe a direction a component can be tensioned or pulled, these arrows are illustrative and in no way limit the direction the respective component can be tensioned or pulled. A person skilled in the art will recognize other ways and directions for creating the desired tension or movement. Likewise, while in some embodiments movement of one component is described with respect to another, a person skilled in the art will recognize that other movements are possible. To the extent features or steps are described herein as being a “first feature” or “first step,” or a “second feature” or “second step,” such numerical ordering is generally arbitrary, and thus such numbering can be interchangeable. Additionally, a number of terms may be used throughout the disclosure interchangeably but will be understood by a person skilled in the art. By way of non-limiting example, the terms “suture” and “filament” may be used interchangeably, and in some instances, simultaneously. 
     The present disclosure generally relates to a surgical implant for use in surgical procedures such as soft tissue (e.g., ACL) repairs. More particularly, the devices provided for herein use a flexible filament body in conjunction with one or more filaments associated with the body, the one or more filaments being configured to hold a graft(s) to be implanted at a surgical site. For example, the one or more filaments can be formed into one or more coils that can receive and hold a graft(s). In some embodiments, the coil(s) can be adjustable such that as a size of an opening(s) defined by a coil(s) is changed, the location of the graft(s) associated with the coil(s) with respect to the filament body can also change. The flexible filament body can be configured to be actuated between unstressed configurations in which terminal ends of the body are generally opposed to each other approximately along a longitudinal axis of the body, and an anchoring configuration in which the body becomes more compact while being able to be positioned proximate to a bone tunnel to secure a location of the graft associated with the flexible filament body within the bone tunnel. In some embodiments, a feedback unit can be incorporated with, coupled to, or otherwise associated with the filament body to help notify a surgeon where the filament body is with respect to a bone tunnel through which the body is passing. 
     One exemplary embodiment of an implant  20  is provided in  FIG.  2   . As shown, the implant  20  includes a flexible filament body  40  and a suture filament  60 , sometimes referred to as a suture repair construct, associated with the body  40 . The flexible filament body  40  extends between terminal ends  40   a ,  40   b  to define a length ℓ U  of the filament, and thus the body  40 . The body  40  can include a plurality of openings  46  that extend from a top side  42  to a bottom side  44  of the body  40 . The openings  46  can be pre-formed by virtue of the construction and material of the filament (e.g., it can be a braided filament), or one or more of the openings  46  can be formed to receive suture filament, such as by creating openings where one did not previously exist or by expanding an existing opening to pass a repair construct through the formed opening. 
     As shown, the body  40  can have a leading tail  50  associated with it. In the illustrated embodiment, the leading tail  50  extends from the terminal end  40   b  and is part of the same material that is used to form the flexible filament body  40 . In other embodiments, the leading tail  50  can extend from a different portion of the body  40  and/or it can be its own separate filament that is coupled to or otherwise associated with the body  40 . The leading tail  50  can be used to help maneuver the flexible filament body  40  during a surgical procedure, such as passing it through a bone tunnel, as described in greater detail below. 
     The flexible filament body  40  is reconfigurable between an unactuated or unstressed configuration, shown in  FIGS.  2  and  3 A , and an actuated or anchoring configuration, shown in  FIGS.  3 B and  3 C . In the unactuated or unstressed configuration, the terminal ends  40   a ,  40   b  approximately define the length ℓU, although because the body  40  is flexible, the body  40  may not always be in an approximate straight line. This is illustrated by  FIG.  3 A , in which the flexible filament body  40  is still in the unactuated or unstressed configuration even though terminal end  40   a  is not co-linear with terminal end  40   b  along a longitudinal axis L of the body  40 . Nevertheless, the length ℓU in the unactuated or unstressed configuration is the length of the filament when the body  40  is approximately in a straight line, as shown in  FIG.  2   . 
     In the actuated or anchoring configuration, the terminal ends  40   a ,  40   b  collapse towards a center  48  of the body  40  such that a resulting length ℓA of the body  40  is smaller than the length ℓU. Notably, while the length ℓU is defined by the length when the body is approximately in a straight line, such a requirement is not applicable to the length ℓA because once the body is in the actuated or anchoring configuration, it is not easily manipulated back into a substantially collinear configuration along a longitudinal axis at least because it cannot be easily unwound. Further, in the illustrated embodiment of  FIGS.  3 B and  3 C , the openings  46  of the body  40  through which the suture filament  60  is disposed also collapse towards the center  48 , as demonstrated by the movement of openings  46   a  and  46   b  between  FIGS.  3 A and  3 B . Thus, the terminal ends  40   a ,  40   b , and as shown the openings  46  (e.g.,  46   a ,  46   b ), are typically closer together in the anchoring configuration than they are in the unstressed configuration, However, again, in view of the flexible nature of the body  40 , certainly the body  40  can be manipulated in other ways to place terminal ends  40   a ,  40   b  and/or openings  46  closer together even though the body  40  is in the unstressed configuration. Such movement does not depart from the spirit of the present disclosure. A person skilled in the art will recognize the differences between the unstressed and the anchoring configurations, and in particular how the lengths of the body  40  are defined in both configurations, and other ways the different configurations can be distinguished (e.g., density, distances between selection locations, etc.), in view of the present disclosures. 
     Another non-limiting example of a typically distinguishing characteristic between the two configurations is that generally a density of the body  40  is greater in the anchoring configuration than in the unstressed configuration. Even as the density of the body  40  increases, and a length defined by the terminal ends  40   a ,  40   b  decreases in the anchoring configuration as compared to the unstressed configuration, the length ℓA is still greater than a diameter di of an adjacent bone tunnel  1102  so that the body  40  does not pass through the tunnel  1102 , as described in greater detail below. As also described in greater detail below, actuating the flexible filament body  40  from the unstressed configuration to the anchoring configuration can be achieved by applying tension in a direction away from the flexible filament body  40 , for instance by pulling approximately in a direction C on coils  62   a ,  62   b  of the suture filament  60 , as shown in  FIG.  3 B . Typically pulling the leading tail  50  does not actuate the filament body  40 , although in some other embodiments, a second tail can be associated with the filament body  40  with one tail being configured for the same purposes as the leading tail  50  as described herein, and the other tail being configured to actuate the flexible filament body  40 . A person skilled in the art, in view of the present disclosures, would understand how to associate a second tail with the body  40  to allow the tail to initiate actuation of the body  40 . 
     The suture filament  60  can be associated with the flexible filament body  40  in a number of different ways to allow the suture filament  60  to engage a graft  90  to be implanted and establish a location of the graft  90  with respect to the flexible filament body  40 . As shown in  FIG.  2   -3C, the suture filament  60  is passed through the openings  46  multiple times to form two coils or loops  62   a ,  62   b  for receiving a graft within openings  64   a ,  64   b  defined by the coils or loops  62   a ,  62   b  and the bottom side  44  of the flexible filament body  40 . While a majority of the coils  62   a ,  62   b  are disposed below the flexible filament body  40 , with an area below the flexible filament body  40  illustrated as area Z in  FIG.  2   , a portion is disposed above the flexible filament body  40 , with an area above the flexible filament body  40  illustrated as area Y in  FIG.  2   . The suture filament  60  can also include a slidable portion  70  disposed above the flexible filament body  60 . As shown, the slidable portion  70  is a sliding knot  72 . A number of different sliding knots can be used, including but not limited to a Lark’s Head knot, a Buntline Hitch knot, a Tennessee Slider knot, a Duncan Loop knot, and a Hangman’s Noose knot. The knot  72  can also be self-locking. 
     One or more filament tails  80 ,  82  can extend from the slidable portion. In the illustrated embodiment, two tails or limbs  80 ,  82  formed by opposed terminal ends of the suture filament  60  extend from the knot  72 , with one tail  80  serving as a closure or tensioning tail operable to adjust a size of the openings  64   a ,  64   b  of the coils  62   a ,  62   b , and the other tail  82  serving as a stationary tail, on which one or more half-hitches can be formed at the conclusion of procedure to maintain a location of the knot  72  with respect to the flexible filament body  40 . In other embodiments, both tails  80 ,  82  can be operable to adjust a size of one or more openings of the coils. The size of the openings  64   a ,  64   b  can be adjusted, for example, by applying tension away from the knot  72 , as shown approximately in a direction K in  FIG.  3 C , thereby sliding the tensioning tail  80  in that direction and causing the size of the openings  64   a ,  64   b  to decrease. 
     The implant  20  can be used in conjunction with a bone tunnel  1100 , e.g., a femoral tunnel. Some exemplary descriptions and illustrations of methods for forming bone tunnels are provided later herein with respect to  FIGS.  21 A- 21 C , and are thus not discussed in this section.  FIGS.  3 A- 3 C  provide for method steps involved with implanting and, after passing a flexible filament body  40  of the implant  20  through the bone tunnel  1100 , actuating the body  40  into the anchoring configuration. As shown in  FIG.  3 A , the bone tunnel  1100  includes the implant-receiving tunnel  1102  and a graft tunnel  1106 , with the graft tunnel  1106  having a diameter d 2  that is greater than the diameter di of the implant-passing tunnel  1102 . As also shown in  FIG.  3 A , the implant  20  has a graft  90  disposed through both openings  64   a ,  64   b , thus providing greater strength than if the graft  90  was passed through just one of the two openings. The graft  90  can be associated with the coils  62   a ,  62   b  at any time. After the filament body  40  is pulled through the tunnel  1100  by way of the leading tail  50 , it is still in an unstressed configuration, with at least a portion of the coils  62   a ,  62   b  extending therefrom still disposed within at least a portion of the tunnel  1100 . 
     Tension can be applied to the filament body  40  by applying tension to the graft  90  approximately in the direction C away from the body as shown in  FIG.  3 B . This causes the flexible filament body  40  to constrict and advance from the unstressed configuration to the actuated or anchoring configuration. As discussed above, the length ℓA of the filament body in the anchoring configuration, which as shown can also be considered a diameter of the resulting body  40 , is greater than the diameter di of the implant-passing tunnel  1102  that is adjacent to the body  40 . Tension can then be applied to the closure tail  80  to decrease a size of the openings  64   a ,  64   b , which in turn pulls the graft  90  towards and into the tunnel  1100 , as shown in  FIG.  3 C . One or more half-hitches can be formed proximate to the sliding knot  72  to lock the sliding knot  72  in place, and thus maintain a location of the knot  72 , the coils  62   a ,  62   b , and the graft  90  with respect to the body  40 . 
     Notably, although in the illustrated embodiment the flexible filament body  40  is actuated to move into the anchoring configuration by applying tension to the graft  90 , and thus the coils  62   a ,  62   b , a person skilled in the art, in view of the present disclosures, will recognize a variety of other components and methods that can be used to initiate the reconfiguration of the body  40  from the unstressed configuration to the anchoring configuration. By way of non-limiting example, in some embodiments, a separate actuation limb or tail can extend from the filament body  40 , and can be used to initiate the collapse of the body  40 . Such a tail can extend away from the body  40  from a similar location as the leading tail  50 , can extend away from the body  40  from the opposite terminal end  40   a , or from an intermediate portion of the body  40 . Likewise, although in the illustrated embodiment two coils  62   a ,  62   b  are used to support a single graft  90 , in other embodiments, each coil  62   a ,  62   b  can have a graft associated therewith, and the two tails  80  and  82  can be configured to individually control respective coils  62   a ,  62   b  such that the grafts can be selectively moved by applying tension to either of the two tails  80 ,  82 . Exemplary disclosures related to forming coils from a suture filament, and using the same during a surgical procedure, are provided for at least in U.S. Pat. Application Publication No. 20140257346 of Sengun, et al. and U.S. Pat. Application Publication No. 20150157449 of Gustafson, et al., the content of each which is incorporated by reference herein in their respective entireties. A person skilled in the art would be able to incorporate those teachings that are incorporated by reference into the implants provided for herein, including using such teachings in conjunction with the flexible filament bodies, without much difficulty in view of the present disclosures. 
       FIG.  4    provides an alternative embodiment of an implant  120  having a flexible filament body  140  and a suture filament or suture construct  160  associated with the body  140 . The filament body  140  is similar to the filament body  140  of  FIG.  2   -3C, and includes terminal ends  140   a ,  140   b  that define a length ℓ U ′ as shown when the body  140  is in an unactuated or unstressed configuration and the terminal ends  140   a ,  140   b  are substantially co-linear along a longitudinal axis L′ of the body  140  as shown. Multiple openings  146  exist in the body  140  for having the repair construct  160  passed therethrough, and a leading tail  150  extends from the terminal end  140   b  to help maneuver the flexible filament body  140  during a surgical procedure. The body  140  is reconfigurable between the unactuated or unstressed configuration illustrated in  FIG.  4    and an actuated or anchoring configuration illustrated in  FIGS.  5 A and  5 B , in which a length ℓ A ′ of the body  140  is defined as approximately as a diameter of the resulting collapsed body  140 . 
     The suture filament or repair construct  160  can be associated with the flexible filament body  140  in a number of different ways to allow the suture filament to engage a graft  190  to be implanted and establish a location of the graft  190  with respect to the filament body  140 . As shown in  FIG.  4   -5B, the suture filament  160  is passed through the openings  146  multiple times to form two coils or loops  162   a ,  162   b , at least one of which can be used for receiving the graft  190  within the opening  164   a ,  164   b  defined by the respective coil or loop  162   a ,  162   b  and a bottom side  144  of the flexible filament body  140 . The coils  162   a ,  162   b  are different than those of  FIG.  2   -3C in that each coil includes two limbs of filament passing through each opening  146  of the filament body rather  140  rather than just one limb. While a majority of the coils  162   a ,  162   b  are disposed below the flexible filament body  140 , with an area below the flexible filament body illustrated as area Z′ in  FIG.  4   , a portion is disposed above the flexible filament body  140 , with an area above the flexible filament body illustrated as area Y′ in  FIG.  4   . 
     The suture filament  160  can also include a slidable portion  170  disposed above the flexible filament body  140 . As shown, the slidable portion  170  is a sliding knot  172 . A number of different sliding knots can be used, including but not limited to a Lark’s Head knot, a Buntline Hitch knot, a Tennessee Slider knot, a Duncan Loop knot, and a Hangman’s Noose knot. The knot  172  can also be self-locking. The construct  160  can also include one or more closure tails or limbs  180 ,  182  that extend from the slidable portion  170 , and which can be operable to control a size of the openings  164   a ,  164   b  in manners described herein or otherwise known to those skilled in the art. In the illustrated embodiment, both tails  180 ,  182  serve as closure tails, and thus tension applied to either can change a size of at least one of the openings  164   a ,  164   b . In other embodiments, one of the tails  180 ,  182  may be a stationary tail. 
       FIGS.  5 A and  5 B  both illustrate the flexible filament body  140  in the actuated or anchoring configuration with a graft  190  passing through the openings  164   a . The implant  120  is used in conjunction with a bone tunnel  1100 ′, e.g., a femoral tunnel, having a configuration similar to the one described above, and thus includes an implant-receiving tunnel  1102 ′ having a diameter that is less than a graft tunnel  1106 ′. 
     Similar to the flexible filament body  40 , the flexible filament body  140  can be actuated by applying tension in a direction away from the body, such as by applying tension approximately in a direction C′ to the graft  190  and/or the coil  162   a , as shown in  FIG.  5 A . As shown in  FIG.  4   , the other coil  162   b  is proximate to the body  140  as the body  140  is actuated, and the coil  162   b  actually becomes part of the mass that defines the body  140  in the anchoring configuration, as shown in  FIGS.  5 A and  5 B . Tension can then be applied to the closure tails  180 ,  182 , for instance by applying it approximately in a direction K′ as shown in  FIG.  5 B , to decrease a size of the opening  164   a , and in turn pull the graft  190  towards and into the tunnel  1100 ′ as shown in  FIG.  5 B . As also shown in  FIG.  5 B , one or more-half hitches  184  can be formed on at least one of the tails  180 ,  182  to lock the sliding portion  170  in place, and thus maintain a location of the sliding portion  170 , the coil  162   a , and the graft  190  with respect to the body  140 . 
       FIGS.  6 A- 6 D  illustrate one exemplary method for forming the repair construct  160  of  FIG.  4   -5B. In this embodiment, the portion of filament  160  that forms the coils  162   a ,  162   b  is formed from a bifurcated suture filament having a tubular portion  165  with a core removed to form a cannulated portion  166  and first and second terminal limbs  167 ,  168 . As shown in  FIG.  6 B , the terminal limbs  167 ,  168  can be curled back toward the tubular portion  165  to form a loop having an opening that defines the portions that will become the coils once associated with the filament body. As shown in  FIG.  6 C , a bore  169  can be formed on a side of the tubular portion  165  and the terminal limbs  167 ,  168  can be placed into the cannulated tubular portion  166  through the bore  169 . Ends of the terminal limbs  167 ,  168  can be fed through the cannulated portion  166 , and as shown in  FIG.  6 D , the terminal limbs  167 ,  168  can be pulled distally (approximately in a direction M in  FIG.  6 D ) through the tubular portion  165  such that the tubular portion  165  is fed through itself. Accordingly, the filament that forms the coils can be collapsed by tensioning the limbs  167 ,  168  in approximately the direction M. 
     Although in the embodiment illustrated in  FIGS.  6 A- 6 D  the portions of filament  160  that will become the coils are defined by a portion of a filament sliding inside of itself, a person skilled in the art will recognize that in alternative embodiments the filament  160  can be formed into a sliding knot to define the portion of filament that becomes the coils. A number of different sliding knots can be used, including but not limited to a Lark’s Head knot, a Buntline Hitch knot, a Tennessee Slider knot, a Duncan Loop knot, and a Hangman’s Noose knot, and the knot can be self-locking. To the extent the sliding knot used to form the portion of filament that becomes the coils impacts the operation of the coils, for instance whether a limb is pulled through a knot to change the position of the knot or a knot is slid along a limb to change the position of the knot, a person skilled in the art would be able to adapt these types of knots for use with the teachings of the present disclosure without departing from the spirit of the present disclosure. 
       FIGS.  7 A and  7 B  illustrate an alternative embodiment of a repair construct  160 ′ that can be used in conjunction with the implant  120  of  FIG.  4   -5B. In this embodiment, a slidable portion is defined by a snare  172 ′, which itself is defined by a sliding knot  173 ′. The portion that extends from an opposite side of the sliding knot  173 ′, i.e., away from the snare  172 ′, are limbs  174 ′,  175 ′ that form the portion of the construct  160 ′ that will become the coils, and then, optionally, one of the two limbs is passed through itself in a coaxial region  176 ′ so that a terminal end of the construct  160   t ′ includes only a single filament  177 ′. More particularly, the repair construct  160 ′ is generally formed from a single elongate filament that is folded to form a first limb  174 ′ and a second limb  175 ′. The first limb  174 ′ can generally be longer than the second limb  175 ′, and the two limbs can be used to form both the snare  172 ′ and the coaxial region  176 ′. The snare  172 ′, which is disposed on a first end  160   a ′ of the construct  160 ′, can be configured to receive an opposite end  160   b ′ of the construct  160 ′ and is operable to collapse around a portion of the construct disposed in an opening  171 ′ thereof. The portion that then extends through and out of the snare  172 ′ defines the tail(s) used to adjust a size of openings of coils defined by the intermediate portions of filament  160 ′. The coaxial region  176 ′ is generally configured to allow the shorter second limb  175 ′ to be disposed within a volume of the first limb  174 ′, thereby eliminating any additional component for suture management, such as a sleeve. The first limb  174 ′ can then extend beyond the coaxial region  176 ′ to form a tail  177 ′ of the construct  160 ′. 
     The collapsible snare  172 ′ can be formed using any number of techniques known to those skilled in the art. In the illustrated embodiment the first and second limbs  174 ′,  175 ′ are formed to include a sliding knot  173 ′. The sliding knot  173 ′ is configured such that as it moves toward the coaxial region  176 ′, a size of the opening  171 ′ defined by the snare  172 ′ increases, and as the knot  173 ′ moves away from the coaxial region  176 ′, the size of the opening  171 ′ decreases. Some exemplary knot types include a Lark’s Head knot, an Overhand Knot, and a Blood knot, and the knot can be a self-locking knot. A person skilled in the art will understand that in other configurations, a size of the opening  171 ′ defined by the snare  172 ′ may be adjusted in different manners, depending on the type of knot, desired use, etc. Some exemplary snare and formations thereof are described in U.S. Pat. Application Publication No. 2012/0130424 of Sengun et al. and U.S. Pat. No. 9,060,763 to Sengun, the content of which is incorporated by reference in their entireties. 
     The coaxial region  176 ′ in the illustrated embodiment is formed by passing terminal end  175   t ′ of the second limb  175 ′ into a volume of the first limb  174 ′. As shown in  FIG.  7 B , at least a portion of the first limb  174 ′ can be cannulated, and an opening  179 ′ on a side of the first limb  174 ′ allows the second limb  175 ′ to be disposed in the first limb  174 ′. The opening  179 ′ can be created manually by forming a hole in the side of the first limb  174 ′ and removing a core of the first limb  174 ′ so that there is space to receive the second limb  175 ′. Alternatively, the filament of the first limb  174 ′ can be a braided suture with a core removed from at least the portion of the first limb  174 ′ that is part of the coaxial region  176 ′, thereby allowing the first limb  174 ′ to receive the second limb  175 ′. In other embodiments a core of a filament, braided or otherwise, is not removed and the second limb  175 ′ is still disposed in first limb  174 ′ using techniques known to those skilled in the art. A junction Bi at which the second limb  175 ′ engages the first limb  174 ′ can be a self-maintaining junction. As a result, pulling on the tail  177 ′ of the surgical construct  160 ′ does not cause the second limb  175 ′ to pull out of the first limb  174 ′. Rather, pulling on the tail  177 ′ can actually force the first limb  174 ′ to collapse around the second limb  175 ′, thereby providing sufficient friction between the two limbs  174 ′ and  175 ′ to hold them together. The two limbs  174 ′ and  175 ′, however, can be separated manually at the junction Bi by applying a sufficient amount of force. Although in the illustrated embodiment the junction Bi is formed by inserting the terminal end  175   t ′ of the second limb  175 ′ into a portion of the first limb  174 ′, a person skilled in the art will understand other ways by which the junction can be formed without departing from the spirit of the present disclosure. 
     The tail  177 ′ of the construct  160 ′ is formed by the remaining portion of the first limb  174 ′ that extends beyond the coaxial region  176 ′. The tail  177 ′ can be used, for example, to help lead insertion of the construct  160 ′ into a flexible filament body, e.g., the bodies  40  and  140 , among other things. Additionally, although in the illustrated embodiment a single filament is used to form the first and second limbs  174 ′ and  175 ′, a separate filament can be used for each of the first and second limbs  174 ′ and  175 ′ without departing from the spirit of the disclosures provided herein. Still further, a person skilled in the art will recognize that the methods of forming repair constructs described with respect to  FIGS.  6 A- 7 B  are just some exemplary embodiments for suture filament or repair construct formations that can be used in conjunction with the disclosures to implants provided for herein. Many other methods can be used to form the repair constructs of the present disclosure without departing from the spirit of the present disclosure. By way of non-limiting example, in some embodiments the first and second limbs  174 ′ and  175 ′ can be maintained as separate limbs and used in a manner as illustrated with respect to the implant  120  of  FIG.  4   . 
     Another exemplary embodiment of an implant  220  is provided for in  FIGS.  8 A- 9 B , with  FIGS.  8 A and  8 B  providing a flexible filament body  240  and a suture filament or repair construct  260 , respectively,  FIGS.  8 C and  8 D  illustrating the body  240  and construct  260  coupled together or otherwise associated with each other in the unactuated or unstressed configuration ( FIG.  8 C ) and the actuated or anchoring configuration ( FIG.  8 D ) to form the implant  220 , and  FIGS.  9 A and  9 B  illustrating the implant  220  associated with a graft  290  ( FIGS.  9 A and  9 B ) and implanted at a surgical site that includes a bone tunnel  1100 ″, e.g., a femoral tunnel. As shown, the flexible filament body  240  of  FIG.  8 A  is similar to the filament bodies of  FIG.  2   -3C and 4-5B, and includes terminal ends  240   a ,  240   b  that define a length ℓ U ″ as shown when the body  240  is in an unactuated or unstressed configuration and the terminal ends  240   a ,  240   b  are substantially co-linear along a longitudinal axis L″ of the body  240 . Multiple openings  246  (visible better in  FIG.  8 C  based on locations through which the repair construct  260  passes) exist in the body  240  for having the repair construct  260  passed therethrough, and a leading tail  250  extends from the terminal end  240   b  to help maneuver the flexible filament body  240  during a surgical procedure. The body  240  is reconfigurable between the unactuated or unstressed configuration illustrated in  FIG.  8 C  and an actuated or anchoring configuration illustrated in  FIG.  8 D , in which a length ℓ A ″ of the body  240  is defined as approximately as a diameter of the resulting collapsed body  240 . 
     The suture filament or repair construct  260  includes a snare  272 , a sliding knot  273  that defines a size of the snare  272 , and two tails  274 ,  275  extending from the snare  272 . The portion of the filament  260  that is the snare  272  is the portion that will become the coils  262   a ,  262   b  ( FIG.  8 C ) when the body  240  and suture filament  260  are coupled together. The sliding knot  273  can be configured such that as it moves approximately in a direction V as shown in  FIG.  8 B , a size of the opening  271  defined by the snare  272  decreases, and as the knot  273  moves approximately in a direction W as shown  FIG.  8 B , the size of the opening  271  increases. Some exemplary knot types include a Lark’s Head knot, a Buntline Hitch knot, a Tennessee Slider knot, a Duncan Loop knot, and a Hangman’s Noose knot, and the knot can be a self-locking knot. A person skilled in the art will understand that in other configurations, a size of the opening  271  defined by the snare  272  may be adjusted in different manners, depending on the type of knot, desired use, etc. Some exemplary snare and formations thereof are described in applications and patents previously incorporated by reference above. 
     As shown, one or more filament tails  274 ,  275  extend from the sliding knot  273 . In the illustrated embodiment, two tails  274 ,  275  formed by opposed terminal ends of the suture filament  260  extend from the knot  273 . One tail  274  serves as a closure tail operable to adjust a size of the opening  271  of the snare  272 , and thus a size of openings  264   a ,  264   b  of the coils  262   a ,  262   b  ( FIG.  8 C ) once the suture filament  260  is associated with the flexible filament body  240  as provided for with respect to  FIGS.  8 C and  8 D , and the other tail  275  serves as a stationary tail, on which one or more half-hitches can be formed at the conclusion of procedure to maintain a location of the knot  273  with respect to the flexible filament body  240 . At least in embodiments in which the sliding knot  273  is a locking knot, one or more half-hitches may not be used. As described above, in other embodiments, both tails  274 ,  275  can be operable to adjust a size of the snare  272 , and thus a size of the openings  264   a ,  264   b  defined by the coils  262   a ,  262   b . 
     The repair construct  260  can be associated with the flexible filament body in a number of different ways to allow the construct  260  to engage a graft to be implanted and establish a location of the graft with respect the flexible filament body  240 . As shown in  FIGS.  8 C and  9 A , the construct  260  is passed through the openings  246  multiple times to form two coils or loops  262   a ,  262   b  for receiving a graft  290  ( FIGS.  9 A and  9 B ) within openings  262   a ,  264   b  defined by the coils or loops  262   a ,  262   b  and a bottom side  244  of the flexible filament body  240 . The implant  20  had a single limb of filament define each coil  62   a ,  62   b  for receiving a graft, while the implant  120  had two limbs of filament define each coil  162   a ,  162   b  for receiving a graft. The implant  220  includes one coil having each configuration. As shown in  FIG.  8 C , the first coil  262   a  includes two limbs, each defining the opening  264   a  for receiving a graft, while the second coil  262   b  includes a single limb that defines the opening  264   b  for receiving a graft. In use as illustrated in  FIGS.  9 A and  9 B , the three limbs and two coils  262   a ,  262   b  are used together to provide additional strength for holding a single graft  290 . A person skilled in the art, in view of the present disclosures, however, will recognize a variety of different ways coils can be formed and used separately and together to receiving one or more grafts. Further, in the illustrated embodiment, unlike previously illustrated embodiments, the slidable portion or knot  273  is not disposed centrally with respect to flexible filament body  240 . The slidable portion of the repair constructs of any of the implants provided for herein can generally disposed anywhere along a length of the flexible filament body of the implants. 
     While a majority of the coils  262   a ,  262   b  are disposed below the flexible filament body  240 , with an area below the flexible filament body  240  illustrated as area Z″ in  FIGS.  8 C and  9 A , a portion is disposed above the flexible filament body  240 , with an area above the flexible filament body  240  illustrated as area Y″ in  FIGS.  8 C and  9 A . The slidable portion of the construct  260  that is disposed above the flexible filament body  240  is the sliding knot  273  that defines the snare  272 . Similar to the earlier configurations, the filament body  240  can be actuated to form the anchoring configuration illustrated in  FIGS.  8 D and  9 B  by applying tension in a direction away from the body, such as by applying tension approximately in a direction C″ away from the body  240  as shown in  FIGS.  8 C and  9 A . Tension can then be applied to the closure tail  274 , for instance by applying it approximately in a direction K″ as shown in  FIG.  9 B , to decrease a size of the openings  264   a ,  264   b , which in turn pulls the graft  290  disposed within the openings  264   a ,  264   b  towards the flexible filament body  240  and into the graft tunnel  1106 ″. Similar to earlier embodiments, the bone tunnel  1100 ″ illustrated in  FIG.  9 B  includes both the graft tunnel  1106 ″ and the implant-passing tunnel  1102 ″, with a diameter d 2 ″ of the graft tunnel  1106 ″ being larger than the diameter d 1 ″ of the implant-passing tunnel  1102 ″. Formation of such tunnels  1102 ″ and  1106 ″ is provided for below with respect to  FIGS.  21 A- 21 C . One or more half-hitches can be formed on the tail  275  proximate to the sliding knot  273  to lock the sliding knot  273  in place, and thus maintain a location of the knot  273 , the coils  262   a ,  262   b , and the graft  290  with respect to the body  240 . 
       FIGS.  10 A- 12 C  illustrate two exemplary embodiments of an implant  320 ,  320 ′ that includes a flexible filament body  340 ,  340 ′ and a suture filament or repair construct  360 ,  360 ′ associated with the body  340 ,  340 ′ in which a slidable portion  370 ,  370 ′ of the construct  360 ,  360 ′ is a coaxial region  372 ,  372 ′. In alternative embodiments, the coaxial region can be a separate sleeve disposed in locations illustrated where a hollow portion of the filament includes another portion of the filament passing therethrough. 
     The implant  320  of  FIG.  10 A  includes a flexible filament body  340  that is similar to the flexible filament bodies  40 ,  140 ,  240  described above except it does not include a leading tail. Alternatively, the body  340  can include a filament tail  350 , as illustrated in  FIGS.  12 A- 12 C . The flexible filament body  340  includes terminal ends  340   a ,  340   b  that define a length ℓ U ″′ (not shown) when the body  340  is in an unactuated or unstressed configuration and the terminal ends  340   a ,  340   b  are substantially co-linear along a longitudinal axis (not shown) of the body  340 . Such a configuration is not illustrated, but is easily derivable based on other configurations and descriptions provided for herein and the knowledge of those skilled in the art. In embodiments in which a filament tail  350  is provided, the leading tail  350  can be disposed approximately at a midpoint E with respect to the length ℓ U ″′ of the filament body  340 , as shown in  FIG.  12 A . Alternatively, it can be disposed at other locations, including but not limited to a terminal end  340   b  as provided for in other embodiments herein. Similar to leading tails described above, in some embodiments the filament tail  350  can be a part of the filament that forms the flexible filament body  340 , while in other embodiments the filament tail  350  can be a separate filament that is coupled to the flexible filament body  340  using any techniques known to those skilled in the art. 
     Multiple openings  346  exist in the body  340  for having the repair construct  360  passed therethrough, and similar to other embodiments, the body  340  is reconfigurable between an unactuated or unstressed configuration illustrated in  FIGS.  10 A and  12 A , and an actuated or anchoring configuration illustrated in  FIGS.  12 B and  12 C . Notably, in the illustrated unstressed configuration, the flexible filament body  340  can be bent, as provided for in  FIGS.  10 A and  12 A , but it is still not in a denser, balled up type configuration like it is in the anchoring configuration as provided for in  FIGS.  12 B and  12 C  and in other embodiments of an implant herein. As described herein, however, the length ℓ U ″′ of the flexible filament body  340  in the unstressed configuration is still a length that can be formed while the body  340  is unactuated, i.e., by the terminal ends  340   a ,  340   b  being collinear along a longitudinal axis of the body  340 , while a length ℓ A ″′ in an actuated or anchoring configuration is approximately the diameter of the balled up configuration, as illustrated in  FIGS.  12 B and  12 C . 
     The coaxial region  372  that is the slidable portion  370  of the implant  320  can be formed in a variety of ways to form such regions known by those skilled in the art. In the illustrated embodiment, the filament  360  includes a hollow portion through which another portion of the filament passes. More specifically, as shown in  FIG.  10 B , a portion of the filament passed through a first opening  369  in the filament  360 , through the hollow portion  366 , and out of a second opening  363  in the filament. The portion of filament  360  disposed in the hollow portion  366  can change as a result of the slidable nature of the configuration, which in turn can adjust a size of openings of the coils or loops  362   a ,  362   b  formed by the filament  360 , which as illustrated in  FIG.  10 A  and described in greater detail below when describing how the filament  360  is coupled to or otherwise associated with the flexible filament body  340 . The hollow portion  366  can be formed using any known techniques, including the filament  360  already being pre-formed to include a hollow portion or forming the hollow portion  366  by removing a portion of a core of the filament  360 . The portion of the filament  360  that is disposed within the hollow portion  366  can engage with the portions of the filament  360  surrounding the openings  369 ,  363  through which it passes to act like a Chinese finger trap. Those skilled in the art will understand how such an interaction works, and thus a further explanation of a Chinese finger trap is unnecessary. 
     The repair construct  360  can be associated with the flexible filament body  340  in a number of different ways to allow the suture filament  360  to engage a graft to be implanted and establish a location of the graft with respect to the filament body  340 . As shown in  FIGS.  10 A and  12 A , the suture filament  360  is passed through the openings  346  multiple times to form two coils or loops  362   a ,  362   b  for receiving a graft  390  within openings  364   a ,  364   b  defined by the coils or loops  362   a ,  362   b  and a bottom side  344  of the flexible filament body  340 . In the illustrated embodiment, the coaxial region  372  is part of the suture filament  360  that is passed through the flexible filament body  340 , which can help keep a length of the implant  320  that goes through an implant-passing tunnel  1102 ‴( FIG.  12 A ) at a minimum (e.g., a diameter of the tunnel  1102 ‴being as small as 2 millimeters). Any portion of the suture filament  360  can be the portion that is passed through the flexible filament body  340 . 
     As shown in  FIGS.  10 A and  12 A , the coils or loops  362   a ,  362   b  are formed by portions of the suture filament  360  that extend away from the flexible filament body  340 . More particularly, both a portion of the filament  360  that forms the hollow portion  366  of the coaxial region  372  through which another portion of the filament  360  passes, and the portion of the filament  360  that passes through the hollow portion  366  form the coils or loops  362   a ,  362   b . Similar to other embodiments, while a majority of the coils  362   a ,  362   b  are disposed below the flexible filament body  340 , with an area below the body illustrated as area Z‴ in  FIG.  10 A , a portion is disposed above the body, with an area above the body illustrated as area Y‴ in  FIG.  10 A . 
     More particularly, the coaxial regions  372  are disposed at either end of an intermediate portion  382  of the suture filament  360  disposed between the two coaxial regions  372 . The first loop  362   a  is formed by the suture filament  360  extending away from the filament body and the coaxial region  372  that is proximate to the terminal end  340   a  of the filament body  340  in  FIG.  10 A , and then passing through the other coaxial region  372 , i.e., the coaxial region  372  that is proximate to the terminal end  340   b  of the filament body  340  in  FIG.  10 A , with the portion that exits the other coaxial region  372  forming the closure limb  380 . Likewise, the second loop  362   b  is formed by the suture filament  360  extending away from the filament body  340  and the other coaxial region  372 , again the coaxial region  372  that is proximate to the terminal end  340   b  of the filament body  340  in  FIG.  10 A , and then passing through the first coaxial region  372 , i.e., the coaxial region  372  that is proximate to the terminal end  340   a  of the filament body  340  in  FIG.  10 A , with the portion that exits the first coaxial region  372  forming the closure limb  380 . Operation of the closure limbs  380  can be effective to adjust a size of all of the openings  364   a ,  364   b  of the coils or loops  362   a ,  362   b . 
     In alternative embodiments of an implant  320 ′, more than two loops or coils can be formed. As shown in  FIG.  11   , four loops or coils  362   a ′,  362   b ′,  362   c ′,  362   d ′ are provided, with the two additional coils or loops being formed by passing suture filament  360 ′ through openings  346 ′ of a filament body  340 ′ multiple more times. The multiple additional passes in the illustrated embodiment do not include additional coaxial regions  372 ′, and instead involve the suture filament  360 ′ just passing through the flexible filament body  340 ′, although additional coaxial regions can be formed if desired. Similar to the earlier described embodiment, operation of closure limbs  380 ′ can be effective to adjust a size of all of openings  364   a ′,  364   b ′,  364   c ′,  364   d ′ defined by the coils or loops  362   a ′,  362   b ′,  362   c ′,  362   d ′. 
       FIGS.  12 A- 12 C  illustrate one exemplary method for passing the implant  320  through a bone tunnel  1100 ‴, e.g., a femoral tunnel. The tunnel  1100 ″ includes both an implant-passing tunnel  1102 ‴ and a graft tunnel  1106 ‴, the formation of which is described below with respect to  FIGS.  21 A- 21 C . Additionally, a graft  390  is passed through the openings  364   a ,  364   b  formed by the coils  362   a ,  362   b . The implant  320  can be passed through the tunnel  1100 ‴ by applying tension to the filament tail  350  approximately in a direction Q to advance the implant  320  through the graft tunnel  1106 ‴, and into and subsequently out of the implant-passing tunnel  1102 ‴. As shown, the flexible filament body  340  can also exit the implant-passing tunnel  1102 ‴, while at least a portion of the coils  362   a ,  362   b  remains disposed within both the implant-passing and graft tunnels  1102 ‴,  1106 ‴. As described earlier with respect to the leading tails  50 ,  150 ,  250 , typically applying tension to the filament tail  350  does not cause the flexible filament body  340  to actuate. The flexible filament body  340  can be actuated, however, by applying tension to the one or more coils  362   a ,  362   b  in a direction away from the flexible filament body, as shown approximately in a direction C‴ in  FIG.  12 B . The flexible filament body  340  then further collapses upon itself into a balled up, denser configuration as shown. In some embodiments, at least a portion of the coaxial region  372  can be drawn into the mass that forms the flexible filament body  340  in its anchoring configuration. As shown in  FIG.  12 C , tension can be applied to the closure limbs  380 , for instance approximately in a direction K‴, to decrease a size of the openings  364   a ,  364   b  of the coils  362   a ,  362   b , and thus draw the graft  390  into, or further into, the graft tunnel  1106 ‴. 
     Both the flexible filament body  40 ,  140 ,  240 ,  340 ,  340 ′ and the suture filament or repair construct  60 ,  160 ,  260 ,  360 ,  360 ′ can be formed from a variety of materials in a variety of forms. The type of filaments and materials of the filaments for the body and the construct can be similar or different for the same implant. Typically, the materials that are used to form both the body and repair construct are what a person skilled in the art would consider to be soft materials, which helps minimize unwanted trauma on the tissue with which the implant is used. In one exemplary embodiment, the flexible filament body is formed using a surgical filament, such as a braided filament. The type, size, and strength of the materials used to form the flexible filament body can depend, at least in part, on the materials and configuration of the repair construct, the type of bone or tissue with which it will be used, and the type of procedure with which it will be used. In one exemplary embodiment the flexible filament body is formed from a #2 filament (about 23 gauge to about 24 gauge), such as an Orthocord™ filament that is commercially available from DePuy Mitek, Inc. or an Ethibond™ filament that is commercially available from Ethicon, Inc., Route 22 West, Somerville, NJ 08876. Orthocord™ suture is approximately fifty-five to sixty-five percent PDS™ polydioxanone, which is bioabsorbable, and the remaining thirty-five to forty-five percent ultra high molecular weight polyethylene, while Ethibond™ suture is primarily high strength polyester. The amount and type of bioabsorbable material, if any, utilized in the filaments of the present disclosure is primarily a matter of surgeon preference for the particular surgical procedure to be performed. 
     The type, size, and strength of the materials used to form the suture filament or repair construct can likewise depend, at least in part, on the materials and configuration of the flexible filament body, the type of bone or tissue with which it will be used, and the type of procedure with which it will be used. In one exemplary embodiment the flexible material is a #2 filament (about 23 gauge to about 24 gauge), such as an Orthocord™ filament that is commercially available from DePuy Mitek, Inc or Ethibond™ filament available from Ethicon, Inc. Generally the filament is relatively thin to minimize any trauma to tissue through which it passes. In some embodiments the filament can have a size between about a #5 filament (about 20 gauge to about 21 gauge) and about a #5-0 filament (about 35 gauge to about 38 gauge). The Orthocord™ #2 filament can be useful because it has a braided configuration, which allows other components, including the filament itself, to pass through subcomponents of the braid without causing damage to the filament. Filaments configured to allow for a cannulated configuration, such as by removing a core therefrom or having a pre-formed cannulated configuration, can also be used. Orthocord™ suture is approximately fifty-five to sixty-five percent PDS™ polydioxanone, which is bioabsorbable, and the remaining thirty-five to forty-five percent ultra high molecular weight polyethylene, while Ethibond™ suture is primarily high strength polyester. The amount and type of bioabsorbable material, if any, utilized in the filament bodies and the repair constructs of the present disclosure is primarily a matter of surgeon preference for the particular surgical procedure to be performed. 
     In addition to providing implants that can be less traumatic to tissue, and reduces an amount of bone removed to form a bone tunnel, the present disclosures also provide for embodiments that make it easier for a surgeon to identify a location of an implant during a surgical procedure. These embodiments come in a variety of forms, and one such embodiment is illustrated in  FIG.  13   -14D. 
     As shown in  FIG.  13   , a feedback unit  492  is provided to assist a surgeon in knowing a location of an implant  420 . The feedback unit  492  is a pliable body  494 , sometimes referred to as a pledget, that includes a midpline  496  disposed approximately at a midpoint along its length ℓ. In other embodiments, the midpline  496  can be a hinge. Opposed plates  498   a ,  498   b  of the body  494  can rotate about the midpline  496  between a straight and a bent configuration. More particularly, the plates  498   a ,  498   b  pledget  494  can be biased towards the straight configuration, but they can be configured to move to the bent configuration by applying sufficient pressure to the pledget  494 , for instance by applying pressure to ends of the pledget  494  when it passes through a small space. The pledget  494  can be disposed within a flexible filament body, as shown, or in other embodiments it can be attached to an outer surface of the body  440  of the implant  420 . In some embodiments, a filament tail  450  can be passed through openings  446  of the flexible filament body  440  and openings  499  formed through both plates  498   a ,  498   b  of the pledget  494 , to be used to direct positioning of the flexible body  440 , and thus the pledget  494 , during a surgical procedure. 
     In use, the flexible filament body  440  can have a suture filament or repair construct  460  formed into coils  462   a ,  462   b  associated therewith to form the implant  420 , with a graft  490  (only shown in  FIG.  14 A ) disposed within openings  464   a ,  464   b  of the coils, and thus associated with the body  440 , as shown in  FIG.  14 A . The implant  420  can be drawn through a bone tunnel  2100 , e.g., a femoral tunnel, as shown the tunnel  2100  having both an implant-passing tunnel  2102  and a graft tunnel  2106 , by applying tension to the filament tail  450  approximately in a direction G. The tunnel  2100  and pledget  494  can be sized such that as the flexible body  440  is passed through the graft tunnel  2106 , the pledget  494  remains in the straight configuration, illustrated in  FIGS.  14 A and  14 B , and when the body  440  passes into the implant-passing tunnel  2102 , the pledget  494  moves into its bent configuration, as shown in  FIG.  14 C . When the pledget  494  exits the implant-passing tunnel  2102 , it returns back to the straight configuration in view of the bias of the pledget  494 , as shown in  FIG.  14 D . As the pledget  494  returns to the straight configuration, it can make an audible sound, thereby notifying a surgeon of the configuration change. When a surgeon hears this sound, the surgeon knows that the flexible filament body  440  has passed through implant-passing tunnel  2102 , and thus the flexible filament body  440  can be actuated into the anchoring configuration as desired. In some instances, a surgeon may also feel the pledget  494  return to the straight configuration, for instance in the form of a tactile “click,” thus providing an alternative notification that the flexible filament body  440  has passed through the implant-passing tunnel  2102 , referred to herein as tactile feedback. 
       FIGS.  15 A- 16 E  provide for alternative feedback units  592 ,  592 ′,  592 ″,  592 ‴,  592 ⁗ for use with implants  520 ,  520 ′,  520 ″ (implants  520 ‴,  520 ⁗ for use with the feedback units of  FIGS.  15 D and  15 E  are not illustrated). The feedback units  592 ,  592 ′,  592 ″,  592 ‴,  592 ⁗ in these figures are bodies or pledgets  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ designed to be disposed at a terminal end of a flexible filament body  540 ,  540 ′,  540 ″ (flexible filament bodies  540 ‴,  540 ⁗ for use with the feedback units  592 ″,  592 ⁗ of  FIGS.  15 D and  15 E  are not illustrated). Such a configuration can be helpful for configurations of flexible filament bodies  540 ,  540 ′,  540 ″ having leading tails  550 ,  550 ′,  550 ″ disposed at terminal ends  540   b ,  540   b ′,  540   b ″. The bodies  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ can be pliable such that in a resting configuration a greatest width  w1,   w2,   w3 ,  w4 ,  w5  thereof is larger than a diameter of an implant-passing tunnel, but the bodies  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ can be compressed to pass through such a tunnel when tension is applied to the bodies, thus placing the bodies into a compressing configuration. The bodies  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ can have any number of shapes, five of which are illustrated in  FIGS.  15 A- 15 E . In the embodiments of  FIGS.  15 A- 15 C , the feedback unit  594 ,  594 ′,  594 ″ is disposed at a distal, terminal end  540   a ,  540   a ′,  540   a ″ of the flexible filament body  540 ,  540 ′,  540 ″, while the embodiments of  FIGS.  15 D and  15 E  are also configured to be disposed at a distal, terminal end of a flexible filament body, although the feedback units  594 ‴,  594 ⁗ are illustrated by themselves in the figures. 
     The body  594  in  FIG.  15 A  is shaped like an elliptical shim, the body  594 ′ in  FIG.  15 B  is shaped like a hoop that includes an opening  595 ′, the body  594 ″ in  FIG.  15 C  is shaped like a circular disk or puck, the body  594 ‴ in  FIG.  15 D  is shaped like an elliptical button, and the body  594 ⁗ in  FIG.  15 E  is shaped like an hourglass. The bodies  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ can be attached to the flexible filament bodies  540 ,  540 ′,  540 ″ (flexible filament bodies  540 ‴,  540 ⁗ for use with the feedback units  592 ″,  592 ⁗ of  FIGS.  15 D and  15 E  are not illustrated) using any techniques known to those skilled in the art. By way of non-limiting examples, a connecting filament  552 ,  552 ″ connects the bodies  594 ,  594 ″ to the flexible filament bodies  540 ,  540 ″ in  FIGS.  15 A and  15 C , and the body  594 ′ is passed through the flexible filament body  540 ′ in  FIG.  15 B . The bodies  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ are generally kept adjacent to the terminal end  540   b ,  540   b ′,  540   b ″ (terminal ends  540   b ‴,  540   b ⁗ for use with the feedback units  592 ″,  592 ⁗ of  FIGS.  15 D and  15 E  are not illustrated) to provide for accurate notification that the flexible filament body has passed through a bone tunnel, as described below. Similar to the pledget  494 , the notification or feedback provided by the bodies  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗ can be audible and/or tactile. 
       FIGS.  16 A- 16 E  illustrate the implant  520  being used in an implant procedure in which the implant  520  is passed through a bone tunnel  2100 ′, e.g., a femoral tunnel, the tunnel  2100 ′ including an implant-passing tunnel  2102 ′ and a graft tunnel  2106 ′. As shown, the implant  520  that includes the flexible filament body  540  and body  594  of the feedback unit  592 , also includes a suture filament or repair construct  560  and a graft  590  passed through openings  564   a ,  564   b  formed by coils or loops  562   a ,  562   b  of the repair construct  560 . The flexible filament body  540  includes the leading tail  550 , and the repair construct  560  includes a slidable portion  570  disposed on a first side  542  of the body  540  having closure or tensioning limbs  580 ,  582  extending therefrom. A majority of a portion of the coils  562   a ,  562   b  are disposed on a second side  544  of the body  540 . 
     The implant  520  can be drawn into the graft tunnel  2106 ′ and the implant-passing tunnel  2102 ′ by applying tension to the leading end approximately in a direction G′ as illustrated in  FIG.  16 A . The tunnels  2102 ′,  2106 ′ and body  594  can be sized such that as the body  594  is passed through the graft tunnel  2106 ′, the body  594  remains in the resting configuration, illustrated in  FIGS.  16 A and  16 B , and when it passes into the implant-passing tunnel  2102 ′, it moves into its compressing configuration, as shown in  FIG.  16 C . When the body  594  exits the implant-passing tunnel  2102 ′, it returns back to the resting configuration, a shown in  FIG.  16 D . As the body  594  returns to the resting configuration, it can make an audible sound, thereby notifying a surgeon of the configuration change. When a surgeon hears this sound, the surgeon knows that the flexible filament body  540  has passed through implant-passing tunnel  2102 ′, and thus the flexible filament body  540  can be actuated into the anchoring configuration as desired, illustrated in  FIG.  16 E . Actuation of the flexible filament body  540  can be initiated using any of the techniques described herein, including by applying tension to the coils  562   a ,  562   b  in a direction away from the body  540 , as shown by applying tension approximately in a direction C⁗. 
     In this embodiment, the feedback unit  592  ends being disposed between the bone and the flexible filament body  540 . As the flexible filament body  540  is actuated, it can apply a force on the body  594  of the feedback unit  592  approximately in a direction H′ to help maintain the body  540  at a location adjacent to the bone tunnel, and thus the suture filament  560  within the bone tunnels  2102 ′,  2106 ′. Further, or additionally, a surgeon may also feel the body  594  return to the resting configuration, thus providing an alternative notification that the flexible filament body  540  has passed through the implant-passing tunnel  2102 ′. 
       FIG.  17   -18E illustrate another alternative feedback unit  692  for use with an implant  620 . The feedback unit  692  described is a measuring tail  694  that extends from a terminal end  640   b  of a flexible filament body  640  of the implant  620 . The measuring tail  694  includes markings  697  along its length ℓ T  that denote the distance each marking of the markings  697  is from the terminal end  640   b  of the flexible filament body  640 . The inclusion of the measuring tail  694  at the terminal end  640   b  can be particularly useful for embodiments in which an opposed terminal end  640   a  includes a leading tail  650 . The measuring tail  694  can be flexible such that it can easily pass through a bone tunnel  2100 ″, e.g., a femoral tunnel, including both an implant passing tunnel  2102 ″ and a graft tunnel  2106 ″ ( FIGS.  18 A- 18 E ), and it can be made from the same filament that forms the flexible filament body  640 , or it can be a different filament or other flexible material. The length ℓ T  of the measuring tail  694  is typically at least as long as a length of the implant-passing tunnel  2102 ″ so that way the tail  694  can help provide information to the surgeon about whether the flexible filament body  640  has passed through the implant-passing tunnel  2102 ″, as described below. A width of the measuring tail  694  can be such that it is skinny enough to be able to pass through the implant-passing tunnel  2102 ″. In the illustrated embodiment, the measuring tail is approximately 20 millimeters long and includes markings  697  on a surface thereof in 5 millimeter increments, starting from 0 millimeters and going to 20 millimeters. Any number and increment of markings  697  can be used. In some embodiments, the tail  694  can be color coded or include other visualization features that help make it easier for a surgeon to see the markings on the body. 
     In use, the implant  620  can include the flexible filament body  640  and a suture filament or repair construct  660  associated with the body  640  and formed into coils  662   a ,  662   b . A graft  690  can be disposed within openings  664   a ,  664   b  of the coils  662   a ,  662   b , and thus associated with the body  640 , as shown in  FIG.  18 A . The flexible filament body  640  includes the leading tail  650 , and the suture filament  660  includes a slidable portion  670  disposed on a first side  642  of the body  640  having closure limbs or tensioning tails  680 ,  682  extending therefrom, and a majority of the coils  662   a ,  662   b  are disposed on a second side  644  of the body  640 . Prior to implantation, a length of the implant-passing tunnel  2102 ″ of the bone tunnel  2100 ″ can be measured, and the measured length marked on the measuring tail  694 . 
     The implant  620  can be drawn into the graft tunnel  2106 ″ and the implant-passing tunnel  2102 ″ by applying tension to the leading end approximately in a direction G″ as illustrated in  FIG.  18 A . A length of the implant-tunnel  2102 ″ can be less than or equal to the length ℓ T  of the measuring tail  694 . The flexible filament body  640  then passes through the graft tunnel  2106 ″, as shown in  FIG.  18 B , and into the implant-passing tunnel  2102 ″, as shown in  FIG.  18 C . In the illustrated embodiment, as the terminal end  640   a  of the flexible filament body  640  exits the implant-passing tunnel  2102 ″, the measuring tail  694  begins to enter the graft-passing tunnel  2106 ″. As shown in  FIG.  18 D , a visualization device  2200 , such as an endoscope, can be placed proximate to a distal end of the implant-passing tunnel  2102 ″ to allow a user to watch when the marked location on the measuring tail  694 , which denotes the length of the implant-passing tunnel  2102 ″, enters the implant-passing tunnel  2102 ″. When that marked location enters the implant-passing tunnel  2102 ″, a user also knows that the flexible filament body  640  is fully exiting the implant-passing tunnel  2102 ″. After the flexible filament body  640  has fully exited the implant-passing tunnel  2102 ″, or even before it has fully exited in some instances, the body  640  can be actuated into the anchoring configuration, as shown in  FIG.  18 E , using techniques already discussed herein, including by applying tension to the coils  662   a ,  662   b  in a direction away from the body  640 , as shown by applying tension approximately in a direction C⁗′. Further, a person skilled in the art will recognize that other locations can be marked on the marking tail  694 , and the timing of when different portions of the implant  620 , the feedback unit  692 , and/or the graft  690  enter and exit portions of the bone tunnel  2100 ″ can be changed and adjusted as desired without departing from the spirit of the present disclosure. 
       FIGS.  19 A- 20 E  illustrate still another alternative feedback unit  792  for use with an implant  720 . The feedback unit  792  is a rigid body  794  having a length ℓ B  that is larger than a diameter of an implant-passing tunnel  2102 ‴ so that the unit  792  cannot pass into the implant-passing tunnel  2102 ‴. The rigid body  794  can have any number of shapes, similar to the pledgets  594  of  FIGS.  15 A- 15 E , but in the illustrated embodiment the body  794  is a disk or puck shape. As shown in  FIGS.  19 A and  19 B , the body  794  is attached to a flexible filament body  740  of the implant  720  using a connecting filament  752 , and a length ℓ C  of the connecting filament  752  is as long as, or slightly longer, than a length of the implant-passing tunnel  2102 ‴. As a result, the body  794  can engage bone proximate to a distal end of the implant-passing tunnel  2102 ‴ while the flexible filament body  740  can exit a proximal end of the implant-passing tunnel  2102 ‴, and the connecting filament  752  extending therebetween remains disposed in the implant-passing tunnel  2102 ‴. Engagement of the bone proximate to the distal end of the implant-passing tunnel  2102 ‴ provides both audible and tactile feedback to the user. 
       FIG.  19 B  illustrates that the implant  720  can also include a suture filament or repair construct  760  associated with the flexible filament body  740  using techniques provided for herein or otherwise known to those skilled in the art. In the illustrated embodiment, the repair construct  760  includes coils  762   a ,  762   b  that extend freely from the flexible filament body  740  and are not coupled with or directly associated with the body  740 . In other embodiments, one or more portions of the repair construct  760  can be passed through the body  740 . Further, a leading tail  750  can also be associated with the flexible filament body  740 , and a graft  790  can be disposed within openings  764   a ,  764   b  of the coils  762   a ,  762   b , as shown in  FIGS.  20 A- 20 E . The repair construct  760  can also include a slidable portion  770  disposed on a first side  742  of the body  740  having closure limbs or tensioning tails  780 ,  782  extending therefrom, and a majority of the coils  762   a ,  762   b  can be disposed on a second side  744  of the body  740 . 
     In use, the implant  720  can be drawn into a bone tunnel  2100 ‴ having both an implant-passing tunnel  2102 ‴ and a graft tunnel  2106 ‴ by applying tension to the leading tail  750  approximately in a direction G‴ as illustrated in  FIG.  20 A . The flexible filament body  740  then passes through the graft tunnel  2106 ‴ and into the implant-passing tunnel  2102 ‴, as shown in  FIG.  20 B . As a terminal end  740   a  of the flexible filament body  740  approaches the proximal end of the implant-passing tunnel  2102 ‴, the body  794  engages bone surrounding a distal end of the implant-passing tunnel  2102 ‴. As shown in  FIG.  20 C , in embodiments in which the repair construct  760  is not passed through the body  794 , the repair construct  760  can wrap around an outer perimeter of the body  794  as it passes from one side  742  of the body  740  to the opposite side  744 , and into the graft tunnel  2106 ‴. Thus, the body  794  may engage the bone directly, or it may have a repair construct  760  disposed therebetween. The body  794  can have a smooth surface to prevent the body  794  from undesirably cutting or causing the repair construct  760  to fray when the repair construct  760  is pinched between the body  794  and the bone. In alternative embodiments, the repair construct  760  can pass through the body  794 , in which case the body  794  can directly engage the bone. 
     Further application of tension to the leading tail  750  approximately in the direction G‴ can pull any remaining portion of the flexible filament body  740  out of the implant-passing tunnel  2102 ‴, as shown in  FIG.  20 D . The body  794  remains disposed at the distal end of the implant-passing tunnel  2102 ‴ because the body  794  remains engaged with the bone. Likewise, the repair construct  760  remains disposed in both the implant-passing and graft tunnels  2102 ‴,  2106 ‴, and the graft  790  remains below the implant-passing tunnel  2102 ‴, because the body  794  prevents further advancement through the tunnel  2102 ‴. Similar to other embodiments, the flexible filament body  740  can then be actuated, as shown in  FIG.  20 E , to set the location of the flexible filament body  740  with respect to bone when the body  740  is in the anchoring configuration. Actuation can be performed using techniques already discussed herein, including by applying tension to the coils  762   a ,  762   b  in a direction away from the body  740 , as shown by applying tension approximately in a direction C″′″. The repair construct  760  can be manipulated to decrease a size of the openings  764   a ,  764   b  of the coils  762   a ,  762   b  to pull the graft  790  into, or further into, the graft tunnel  2106 ‴, using techniques provided for herein or otherwise known to those skilled in the art. As shown in  FIG.  20 E , the graft  790  can be pulled up to the body  794  while the flexible filament body  740  is anchored with respect to the tunnel  2100 ‴ at the proximal end of the implant-passing tunnel  2102 ‴. 
     Exemplary size and shapes of the various embodiments of feedback units can depend on a variety of factors, including but not limited to the sizes and shapes of the other components with which it is used (e.g., the implants, flexible filament bodies, repair constructs, grafts), the type of procedure being performed, and preferences of the user. In some exemplary embodiments, a material used to form the bodies  494 ,  594 ,  594 ′,  594 ″,  594 ‴,  594 ⁗,  694 , and  794  includes but is not limited to biocompatible materials, polymers, plastics, polyetheretherketone (PEEK), ultra high molecular weight polyethylene, and polypropylene. More than one of these materials can be used to form a feedback unit. 
       FIGS.  21 A- 21 C  illustrate one exemplary embodiment for forming a tunnel  101 ′ ( FIG.  21 C ), e.g., a femoral tunnel, in bone  100 ′ through which implants of the nature provided for herein, or otherwise derivable from the disclosures herein, can be used. The bone  100 ′ in which the tunnel  101 ′ is to be formed is illustrated in  FIG.  21 A . The procedure begins by using a Beath pin to form a tunnel  102 ′ through an entire thickness of the bone  100 ′, as shown in  FIG.  21 B , the tunnel  102 ′ having a diameter approximately in the range of about 2 millimeters to about 2.5 millimeters. The Beath pin, which is typically thin and long, can remain disposed within the bone tunnel  102 ′ to act as a guidewire to help position additional tools for drilling the portion of the tunnel  101 ′ having a larger diameter. 
     More particularly, a reamer can be passed over the Beath pin from a distal end of the bone  100   d ′ to form a larger portion of the tunnel  101 ′, shown in  FIG.  21 C . A diameter of the larger portion can be based on the size of the graft(s) to be disposed therein, and can be approximately in the range of about 6 millimeters to about 8 millimeters. As described above, the first, proximal portion  102 ′ of the tunnel  101 ′ illustrated in  FIG.  21 C  serves as the implant-passing tunnel, and the second, distal portion of the tunnel  106 ′ illustrated in  FIG.  21 C  serves as the graft tunnel. In comparison to the method of forming bone tunnels  101  described with respect to  FIGS.  1 A- 1 D , the methods provided for as described with respect to  FIGS.  21 A- 21 C  eliminate a drilling step and remove less bone because no expansion of the top portion of the tunnel is required in view of the implants and methods disclosed herein. 
     One skilled in the art will appreciate further features and advantages of the invention based on the above-described embodiments. Accordingly, the invention is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. For example, to the extent the present disclosure disclose using the devices and methods provided for herein for ACL repairs and/or within a femoral tunnel, a person skilled in the art will recognize how the present disclosures can be adapted for use with other anatomies. All publications and references cited herein are expressly incorporated herein by reference in their entirety.