Ligament fixation system, implants, and devices with a compression cap, and methods of use
Implants, devices, systems, and methods for achieving ligament fixation are disclosed. An implant comprises a cap member comprising an internally threaded opening extending from a first end thereof, an anchor portion comprising a first end that defines a tip of the implant and external threads, and a coupling portion extending between the cap member and the anchor portion. The coupling portion of the implant includes an externally threaded portion threadably coupled within the internally threaded opening of the cap member. The cap member of the implant is longitudinally moveable along the coupling portion. Insertion instruments for inserting an implant for ligament fixation are also disclosed. Methods of using an implant for achieving ligament fixation are also disclosed.
1 . An implant, comprising:
an end member;
an anchor portion comprising external threads; and
a coupling portion extending between the end member and the anchor portion;
wherein the anchor portion comprises an engagement feature at a proximal end thereof configured to facilitate releasable coupling with the coupling portion and wherein an end portion comprises an engagement feature at a distal end thereof configured to facilitate releasable coupling with the coupling portion.
2 . The implant of claim 1 , wherein the coupling portion comprises a bioresorbable material.
3 . The implant of claim 2 , wherein the implant comprises a cannulated opening extending along at least a portion of a longitudinal axis of the implant.
4 . The implant of claim 1 , further comprising a tension member extending along and through at least a portion of a cannulated opening of the implant.
5 . The implant of claim 4 , wherein the tension member comprises a first end positioned within a cannulated portion of the end member and a second end positioned within a cannulated portion of the anchor portion.
6 . The implant of claim 5 , wherein the tension member is secured in at least one of the end member and the anchor portion by one or more pins.
7 . The implant of claim 5 , wherein the tension member comprises a braided suture.
8 . The implant of claim 5 , wherein the anchor portion comprises at least one transverse opening extending from an exterior surface into the cannulated portion of the anchor portion.
9 . The implant of claim 8 , wherein the at least one transverse opening comprises three transverse openings.
10 . The implant of claim 8 , wherein at least a portion of the tension member disposed within the cannulated portion of the anchor portion is biased in a lateral direction away from a longitudinal axis of the cannulated portion of the anchor portion.
11 . The implant of claim 10 , wherein the tension member comprises a first tension in a first position in which the entirety of the tension member is coaxial with the longitudinal axis of the cannulated opening of the implant and a second tension in a second position in which a portion of the tension member is biased in a lateral direction away from the longitudinal axis of the cannulated opening of the implant, wherein the second tension is greater than the first tension.
12 . The implant of claim 10 , further comprising a cap configured to engage with a proximal portion of the end member via a first threading disposed on an internal surface within a cannulation of the cap and a second threading disposed on at least a portion of an outer surface of the end member.
13 . The implant of claim 12 , wherein the cap is threadably translatable along the second threading so as to increase the tension of the tension member.
14 . An implant, comprising:
an end member;
an anchor portion comprising external threads;
a coupling portion extending between the end member and the anchor portion;
a cap threadably engaged with the end member;
a cannulation extending along a longitudinal axis of the implant along at least a portion of the length of the implant; and
a tension member positioned within the cannulation and extending along a length from a first position disposed within the anchor portion to a second position disposed within the end member;
wherein translation of the cap along the length of the end member increases the length of the tension member thus applying a compressive force between the anchor portion and the end member.
15 . The implant of claim 14 , wherein a portion of the tension member is biased away from the longitudinal axis of the anchor portion by a pin.
16 . The implant of claim 15 , wherein a proximal end of the anchor portion comprises a first coupling geometry configured to releasably couple with a first complimentary geometry positioned at a distal end of the coupling portion, and a distal end of the end member comprises a second coupling geometry configured to releasably couple with a second complimentary geometry positioned at a proximal end of the coupling portion.
17 . The implant of claim 16 , wherein at least a portion of the coupling portion comprises a bioresorbable material.
18 . An implant, comprising:
an end member;
an anchor portion comprising external threads;
a coupling portion extending between the end member and the anchor portion, wherein at least a portion of the coupling portion comprises a bioresorbable material;
a cap threadably engaged with the end member;
a cannulation extending along a longitudinal axis of the implant along at least a portion of the length of the implant; and
a tension member positioned within the cannulation and extending along a length from a first position disposed within the anchor portion to a second position disposed within the end member;
wherein translation of the cap along the length of the end member increases the length of the tension member from a first length to a second length thus applying a compressive force between the anchor portion and the end member.