Skeletal manipulation method
A method of treating scoliosis in a subject includes securing a scoliosis treatment device to first and second locations on the subject's skeletal system, the scoliosis treatment device including a first portion, a second portion moveably mounted relative to the first portion, and an adjustment device disposed on the device and configured to change a distraction force between the first location and the second location, the adjustment device including a rotationally mounted magnetic element configured to move the second portion relative to the first portion in response to rotation of the magnetic element. An external adjustment device is provided external to the subject and is able to adjust the distraction force between the first location and second location.
1. A system for treating a bone deformity comprising:
a distraction device configured to be secured to first and second locations on a subject's skeletal system, the distraction device comprising a first portion, a second portion moveably mounted relative to the first portion, and a rotationally mounted magnetic element configured to move the second portion relative to the first portion in response to rotation of the magnetic element, the magnetic element configured to change a distraction force between the first location and the second location;
an external adjustment device external to a side of the subject's body, the external adjustment device comprising a first external magnet adapted to rotate about a first axis and a second external magnet spaced apart from the first external magnet and adapted to rotate about a second separate axis, with the first external magnet and the second external magnet magnetically coupled to the magnetic element of the distraction device; and
wherein the distraction device is configured for non-invasive adjustment by rotating the first and second external magnets of the external adjustment device to rotate the magnetic element of the distraction device, changing the distraction force between the first location and second location.
2. The system of claim 1 , wherein the magnetic element comprises a rare earth magnet.
3. The system of claim 1 , wherein the magnetic element is grade N30 or higher.
4. The system of claim 1 , wherein the magnetic element is grade N48 or higher.
5. The system of claim 1 , wherein the external adjustment device comprises a motor configured for rotating the first external magnet and the second external magnet.
6. The system of claim 1 , wherein at least one of the first portion and second portion is configured to be secured with at least one screw.
7. The system of claim 1 , wherein at least one of the first portion and second portion is configured to be secured with at least one clamp.
8. The system of claim 1 , the distraction device further comprising a lead screw configured to turn within an internal thread disposed in one of the first portion or second portion.
9. The system of claim 8 , the distraction device further comprising a planetary gear set coupling the cylindrical magnet to the lead screw.
10. The system of claim 9 , the distraction device further comprising a slip clutch, disposed between the cylindrical magnet and the planetary gear set.
11. The system of claim 1 , wherein the external adjustment device comprises two radially-poled permanent magnets.
12. A method for treating a bone deformity, the method comprising:
providing a distraction device configured to be secured to first and second locations on a subject's skeletal system, the distraction device comprising a first portion, a second portion moveably mounted relative to the first portion, and a rotationally mounted magnetic element configured to move the second portion relative to the first portion in response to rotation of the magnetic element, the magnetic element configured to change a distraction force between the first location and the second location;
securing the first portion to a first location; securing the second portion to a second location;
placing an external adjustment device in proximity to the subject, the external adjustment device comprising at least one external magnet having a central axis and configured to rotate about the central axis; and
operating the external adjustment device such that rotation of the at least one external magnet about the central axis results in rotation of the cylindrical magnet of the distraction device about its axis of rotation, wherein the resulting rotation of the cylindrical magnet causes the cylindrical magnet to increase a force or distance between the first location and the second location.
13. The method of claim 12 , wherein the subject has a bone deformity related to Scoliosis.
14. The method of claim 12 , wherein the subject has a bone deformity related to Blount's disease.
15. The method of claim 12 , wherein the distraction device is secured adjacent to a fracture site in the bone.
16. The method of claim 12 , wherein the magnetic element comprises a rare earth magnet.
17. The method of claim 12 , wherein the external adjustment device comprises a motor configured for rotating the first external magnet and the second external magnet.
18. The method of method 12 , wherein at least one of the first portion and second portion is configured to be secured with at least one screw.
19. The method of claim 12 , the distraction device further comprising a lead screw configured to turn within an internal thread disposed in one of the first portion or second portion.
20. The method of claim 19 , the distraction device further comprising a planetary gear set coupling the cylindrical magnet to the lead screw.