External adjustment device for distraction device

Patent metadata

Field	Value
Publication number	US-11504162-B2
Application number	US-202017066338-A
Country	US
Kind code	B2
Filing date	Oct 8, 2020
Priority date	Dec 10, 2015
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

An external adjustment device includes at least one permanent magnet configured for rotation about an axis with a first handle extending linearly at a first end of the device and a second handle at a second end of the device, the second handle extending in a direction substantially off axis to the first handle. The external adjustment device further includes a motor mounted inside the first handle and a first button located in the proximity to one of the first handle or the second handle, the first button configured to be operated by the thumb of a hand that grips the one of the first handle or second handle. The first button is configured to actuate the motor causing the at least one permanent magnet to rotate about the axis in a first direction.

First claim

What is claimed is:

1. A controller for magnetically generating rotational motion in a remote device, comprising:
a first driver magnet, having a first elongate rotational axis, a north pole on a first side of the rotational axis, a south pole on a second side of the rotational axis and a first central magnetic axis extending transversely to the rotational axis and through the centers of the north and south poles;
a second driver magnet, having a second elongate rotational axis, a north pole on a first side of the rotational axis, a south pole on a second side of the rotational axis and a second central magnetic axis extending transversely to the rotational axis and through the centers of the north and south poles;
a flux reference point equidistant from the first drive magnet and the second driver magnet; and
a drive system for synchronous rotation of the first and second driver magnets about the first and second rotational axes;
wherein at least one of the first and second central magnetic axes is oriented at a rotational offset relative to the flux reference point.

2. The controller of claim 1 , wherein the at least one of the first and second central magnetic axes is at a rotational offset of about 5° to about 135°.

3. The controller of claim 2 , wherein the rotational offset is a positive rotation.

4. The controller a claim 2 , wherein the rotational offset is a negative rotation.

5. The controller of claim 1 , wherein both of the first and second central magnetic axes are rotationally offset relative to the flux reference point.

6. The controller of claim 5 , wherein the rotational offset of both the first and second magnetic axes is a rotational offset of about 5° to about 135°.

7. The controller of claim 6 , wherein the rotational offset is a positive rotation.

8. The controller of claim 6 , wherein the rotational offset is a negative rotation.

9. A method for magnetically generating rotational motion in a remote device, comprising:
providing a controller having:
first and second magnets which collectively generate a three dimensional flux field surrounding the magnets, each of the first and second magnets rotatable about respective first and second rotational axes; and
a control circuit, a control device, a control unit, or a control mechanism for adjusting at least one of the relative rotational orientation of at least one of the first and second magnets to the other of the first and second magnet and a gap between the first and second magnets; and

adjusting at least one of the relative rotational orientation of at least one of the first and second magnets to the other of the first and second magnet and the gap between the first and second magnets.

10. The method of claim 9 , further comprising:
inputting an input parameter,
wherein the adjusting is based on the inputted input parameter.

11. The method of claim 10 , wherein the input parameter includes at least one of: a location of the remote device, a patient age, a patient weight, a patient body mass index, a desired gap distance, a desired flux density, or a desired torque generation parameter.

12. The method of claim 10 , further comprising:
sensing a measurable parameter,
wherein the adjusting is based on the sensed measurable parameter.

13. The method of claim 12 , wherein the measurable parameter includes at least one of a gap distance, a magnetic coupling slippage, a torque generated or a force generated.

14. The method of claim 9 , wherein the adjusting includes automatically adjusting the relative rotational orientation of at least one of the first and second magnets to the other of the first and second magnet and the gap between the first and second magnets.

15. The method of claim 9 , wherein the adjusting includes manually adjusting the relative rotational orientation of at least one of the first and second magnets to the other of the first and second magnet and the gap between the first and second magnets.

16. The method of claim 9 , further comprising:
transmitting a signal from the remote device,
wherein the adjusting is based on the transmitted signal.

17. A controller for magnetically generating rotational motion in a remote device, comprising:
a first driver magnet, having a first diameter, a first elongate rotational axis, a north pole on a first side of the rotational axis, a south pole on a second side of the rotational axis and a first central magnetic axis extending transversely to the rotational axis and through the centers of the north and south poles;
a second driver magnet, having a second diameter, a second elongate rotational axis, a north pole on a first side of the rotational axis, a south pole on a second side of the rotational axis and a second central magnetic axis extending transversely to the rotational axis and through the centers of the north and south poles;
a third driver magnet having a third diameter different from the first and second diameters of the first and second driver magnets; and
a drive system for synchronous rotation of the first and second driver magnets about the first and second rotational axes;
wherein the first and second magnets rotate with an angular offset of the first and second central magnetic axes relative to each other.

18. The controller of claim 17 wherein at least one of the first and second driver magnets is a permanent magnet.

19. The controller of claim 17 , wherein at least one of the first and second driver magnets is an electromagnet.

20. The controller of claim 19 , further comprising:
a control circuit, a control device, a control unit, or a control mechanism for adjusting the angle between the first and second central magnetic axes.

Assignees

• Nuvasive Specialized Orthopedics Inc

Inventors

• Cheng Shanbao
• Moeller Michael
• Schwardt Jeffrey

Classifications

• A61B2017/00199

  with a console, e.g. a control panel with a display · CPC title

• A61B17/7216

  for bone lengthening or compression (A61B17/7258 takes precedence) · CPC title

• H01F7/0205

  Magnetic circuits with PM in general · CPC title

• A61B2017/00212

  using remote controls · CPC title

• A61B17/7016 Primary

  electric or electromagnetic means · CPC title