Systems for material fixation
A soft tissue fixation system, most typically applicable to orthopedic joint repairs, such as anterior cruciate ligament (ACL) knee repair procedures, comprises an implant which is placeable in a tunnel disposed in a portion of bone, wherein the tunnel is defined by walls comprised of bone. A first member is deployable outwardly to engage the tunnel walls for anchoring the implant in place in the tunnel, and a second member is deployable outwardly to engage tissue material to be fixed within the tunnel. The second member also functions to move the tissue material outwardly into contact with the tunnel walls to promote tendon-bone fixation. Extra graft length is eliminated by compression of the tendon against the bone at the aperture of the femoral tunnel, which more closely replicates the native ACL and increases graft stiffness. The inventive device provides high fixation of tendon to bone and active tendon-bone compression. Graft strength has been found to be greater than 1,000 N (Newtons), which is desirable for ACL reconstruction systems.
1. A material fixation system, comprising:
an implant comprising a body having a distal end and a proximal end which is placeable in a tunnel disposed in a portion of bone, wherein the tunnel is defined by walls comprised of bone;
a first member comprising an arm pivotally attached to said implant body which is deployable outwardly to engage adjacent bone for anchoring said implant in place in the tunnel;
a second member which is deployable outwardly to engage tissue material to be fixed within said tunnel, and to move the tissue material outwardly into contact with the tunnel walls;
a third member, comprising a wedge, which is movable generally axially to deploy the arm of said first member outwardly; and
a deployment screw having a threaded portion which is engageable with a complementary threaded portion on said wedge, wherein rotation of said deployment screw causes relative movement of said deployment screw and said wedge in order to deploy said first member, and said deployment screw further having a portion proximal to said complementary threaded portion which functions to deploy said second member outwardly.
2. The material fixation system as recited in claim 1 , wherein said wedge moves proximally to deploy said arm.
3. The material fixation system as recited in claim 1 , wherein said second member comprises a compression pad.
4. The material fixation system as recited in claim 1 , wherein the proximal portion of said deployment screw comprises a head of said deployment screw, disposed on a proximal end thereof.
5. An implant system for use in making an orthopedic repair of a joint, said implant system comprising:
a first implant adapted for receiving a tissue graft thereon and then being disposed in a first bone tunnel location, wherein ends of the tissue graft extend through a bone tunnel and out of a proximal end of the tunnel, said first implant comprising:
a body portion having a distal end and a proximal end;
a first member comprising an arm pivotally disposed on said body portion which is deployable outwardly to engage adjacent bone for anchoring said implant in place in the tunnel; and
a second member disposed on said body portion which is deployable outwardly to engage tissue material to be fixed within said tunnel, and to move the tissue material outwardly into contact with the tunnel walls
a third member comprising a wedge which is movable generally axially to deploy said arm outwardly; and
a deployment screw having a threaded portion which is engageable with a complementary threaded portion on said wedge, wherein rotation of said deployment screw causes relative movement of said deployment screw and said wedge in order to deploy said first member, and said deployment screw further having a portion proximal to said complementary threaded portion which functions to deploy said second member outwardly; and
a second implant adapted for disposition in a second bone tunnel location, proximal to said first bone tunnel location, said second implant being adapted to secure the ends of the tissue graft which extend from the first implant against adjacent bone.
6. The material fixation system as recited in claim 1 , wherein said second member is situated proximally of said first member.
7. The material fixation system as recited in claim 1 , wherein said first member comprises a surface which is angled relative to a longitudinal axis of said implant body, said angled surface being adapted to anchor the implant by engaging cortical bone.
8. The material fixation system as recited in claim 5 , wherein said wedge moves proximally to deploy said arm.
9. The material fixation system as recited in claim 5 , wherein said second member comprises a compression pad.
10. The material fixation system as recited in claim 9 , wherein the proximal portion of said deployment screw comprises a head of said deployment screw, disposed on a proximal end thereof.