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. A method of treating a patient, comprising the steps of:
providing a tensioning device having:
a connector configured to couple to a soft tissue, and
an adjustable anchor configured to couple to the connector and to couple to a bone,
wherein the adjustable anchor comprises:
a first end and a second end;
a housing extending between the first end and the second end; and
an adjustable component disposed within a longitudinal cavity in the housing, wherein the adjustable component comprises: a shaft;
a hollow, radially poled magnet disposed about the shaft; and
a magnet housing disposed about and radially affixed to the hollow, radially poled magnet, the magnet housing having an external thread along a portion of an axial extent thereof;
inserting the second end of the adjustable anchor into the bone;
connecting the connector to the soft tissue;
coupling the connector to the adjustable anchor;
adjusting a tension on the connector by rotating the adjustable component within the housing in response to a wireless signal, thereby axially translating the adjustable component within the longitudinal cavity in the housing.
2. The method of claim 1 , wherein the bone is a humerus.
3. The method of claim 1 , wherein the bone is a femur.
4. The method of claim 1 , wherein the bone is a tibia.
5. The method of claim 1 , wherein the soft tissue is a rotator cuff tendon.
6. The method of claim 1 wherein the soft tissue is an anterior cruciate ligament.
7. The method of claim 1 , wherein the soft tissue is a replacement for a ligament.
8. The method of claim 1 , wherein the adjustable component further comprises an eyelet disposed at a first end thereof, and the connector comprises a suture; and
wherein the method further comprises coupling the suture to the eyelet by threading the suture through the eyelet and securing the suture to the eyelet.
9. The method of claim 1 , wherein the adjustable component is rotationally fixed relative to the housing.
10. The method of claim 1 , further comprising:
threadingly engaging an internal thread of the longitudinal cavity of the housing with the external thread of the magnet housing.
11. The method of claim 10 , further comprising:
applying to the patient a magnetic field configured to move in a first rotational direction or a second rotational direction opposite the first rotational direction, thereby causing the hollow, radially poled magnet and the magnet housing to rotate in the second rotational direction or the first rotational direction, respectively, and further causing the adjustable component to axially translate relative to the housing,
wherein the magnetic field is applied non-invasively and externally relative to the patient.
12. The method of claim 11 , wherein applying the magnetic field in the first rotational direction shortens an effective length of the connector and increases tension thereon, and applying the magnetic field in the second rotational direction lengthens the effective length of the connector and decreases tension thereon.
13. The method of claim 1 , further comprising non-invasively adjusting the tension on the connector relative to the adjustable anchor while the patient is awake and mobile.
14. The method of claim 1 , further comprising:
prior to the inserting, preparing a first hole into the bone, the first hole being configured to receive the adjustable anchor.
15. The method of claim 14 , further comprising:
prior to the inserting, preparing a second hole into the bone, wherein the second hole extends at an angle relative to the first hole and is in communication with the first hole, such that the second hole is configured to receive a portion of the connector therethrough.
16. The method of claim 15 , further comprising:
prior to inserting the adjustable anchor into the first hole, inserting the connector such that the connector passes through the second hole; and
coupling the connector to the first end of the adjustable anchor.
17. A method of treating a patient, comprising the steps of:
providing a tensioning device having:
a connector configured to couple to a soft tissue, and
an adjustable anchor configured to couple to the connector and to couple to a bone,
wherein the adjustable anchor comprises:
a first end and a second end;
a housing extending between the first end and the second end; and
an adjustable component disposed within the housing,
wherein the adjustable component comprises:
a cylindrical magnet configured to rotate within the housing; and
a spool coupled to the cylindrical magnet, wherein the spool is configured to rotate within a longitudinal cavity of the housing upon actuation by the cylindrical magnet, and wherein the connector is partially wound on the spool;
inserting the second end of the adjustable anchor into the bone;
connecting the connector to the soft tissue;
coupling the connector to the adjustable anchor; and
adjusting a tension on the connector by rotating the adjustable component within the housing in response to a wireless signal.
18. The method of claim 17 , further comprising:
applying to the patient a magnetic field configured to move in either a first rotational direction or a second rotational direction opposite the first rotational direction,
wherein applying the magnetic field in the first rotational direction causes the cylindrical magnet and the spool to rotate in the first rotational direction, thereby increasing the tension on the connector relative to the adjustable anchor, and applying the magnetic field in the second rotational direction causes the cylindrical magnet and the spool to rotate in the second rotational direction, thereby decreasing the tension on the connector, and
wherein the magnetic field is applied non-invasively and externally relative to the patient.
19. The method of claim 18 , further comprising:
causing the cylindrical magnet to rotate at a first rotational speed, and the spool to rotate at a second rotational speed in a same direction, wherein the second rotational speed is slower than the first rotational speed.