Noninvasively adjustable suture anchors
In one embodiment, an adjustable implant system includes a bone anchor having first and second ends, a bone engagement surface adjacent the first end, and a housing extending between the first and second ends. The adjustable implant system can further include a non-invasively actuatable driving element within the housing and coupled to an adjustment component configured to couple to a flexible elongate tension member which is capable of engaging a patient's soft tissue (e.g., rotator cuff or ACL). Non-invasive actuation of the driving element can cause the adjustment component to change the amount of tension on the flexible elongate tension member and consequently on the patient's soft tissue. The adjustable implant system can include an external adjustment device configured to be placed on or adjacent the patient's skin and comprising at least one energy transferring component configured to energize/actuate the driving element inside the housing of the adjustable implant.
1. An adjustable implant system comprising:
a bone anchor having a first end and a second end, and further comprising a housing extending from the first end to the second end, the housing including a bone engagement feature adjacent the first end;
a flexible elongate tension member extending from the first end of the bone anchor and configured to engage soft tissue of a patient;
a driving element coupled to a spool, with at least a portion of the driving element and the spool disposed within the housing of the bone anchor, with the spool additionally coupled to the flexible elongate tension member, wherein the driving element is configured for non-invasive actuation, for winding and unwinding the flexible elongate tension member about the spool, such that the non-invasive actuation of the driving element causes the spool to wind or unwind the flexible elongate tension member about the spool, thereby changing the amount of tension on the flexible elongate tension member;
an external adjustment device comprising at least one energy transferring component and configured to be placed on or adjacent the skin of the patient, wherein the at least one energy transferring component is configured to energize the driving element inside the housing of adjustable implant.
2. The adjustable implant system of claim 1 , wherein the driving element is selected from the group consisting of: a permanent magnet, an inductively coupled motor, an ultrasonically actuated motor, a subcutaneous hydraulic pump, a subcutaneous pneumatic pump, and a shape-memory driven actuator.
3. The adjustable implant system of claim 1 , wherein the driving element comprises a permanent magnet.
4. The adjustable implant system of claim 3 , wherein the permanent magnet comprises a rare earth magnet.
5. The adjustable implant system of claim 3 , wherein the external adjustment device comprises a first radially-poled permanent magnet configured for rotation about a first axis and a second radially-poled permanent magnet configured for rotation about a second axis.
6. The adjustable implant system of claim 5 , wherein the first axis is different from the second axis.
7. The adjustable implant system of claim 6 , wherein the first axis is parallel to the second axis.
8. The adjustable implant system of claim 1 , wherein the permanent magnet comprises Neodymium-Iron-Boron.
9. The adjustable implant system of claim 1 , wherein the bone anchor secures to the bone by a mechanism selected from the group consisting of: a screw, an interference fit, a tack, an adhesive, a staple, a prong, a flange, a snagging member, a barb, a spike, and a tab.
10. The adjustable implant system of claim 1 , wherein the bone anchor comprises an externally threaded portion configured for engaging cortical bone.
11. The adjustable implant system of claim 1 , further comprising a seal carried by the bone anchor and configured to seal around the exterior of the flexible elongate tension member.
12. The adjustable implant system of claim 1 , further comprising a longitudinal cavity extending along a length of the housing, the longitudinal cavity.