System and method for altering rotational alignment of bone sections

• US 10,646,262 B2
• Filed: 05/25/2018
• Issued: 05/12/2020
• Est. Priority Date: 02/14/2011
• Status: Active Grant

• Current Assignee: Nuvasive Specialized Orthopedics, Inc. (Nuvasive Incorporated)
• Original Assignee: Nuvasive Specialized Orthopedics, Inc. (Nuvasive Incorporated)
• Inventors: Pool, Scott
• Primary Examiner(s): Harvey, Julianna N
• Assistant Examiner(s): NegrelliRodriguez, Christina
• Application Number:
  US15/989,672
• Publication Number:
  US 20180271568A1
• Time in Patent Office: 718 Days
• CPC Class Codes: A61B 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/7216 for bone lengthening or compression A61B17/7258 takes precedence
• CPC Class Codes: A61B 17/725 with locking pins or screws of special form
• CPC Class Codes: A61B 17/8615 at the central region of the screw head
• CPC Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/8875 Screwdrivers, spanners or wrenches
• CPC Class Codes: A61B 17/8888 at its central region
• CPC Class Codes: A61B 17/921 for intramedullary devices
• CPC Class Codes: A61B 2017/00411 actuated by application of energy from an energy source outside the body
• CPC Class Codes: A61B 2017/00845 of moving parts with respect to each other
• CPC Class Codes: A61B 2017/00876 magnetic
• CPC Class Codes: A61B 2017/681 Alignment, compression, or distraction mechanisms
• CPC Class Codes: A61B 2090/031 torque limiting
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61B 50/20 Holders specially adapted for surgical or diagnostic appliances or instruments drapes with means to hold surgical instruments A61B46/23; for catheters A61M25/02
• CPC Class Codes: A61B 50/30 Containers specially adapted for packaging, protecting, dispensing, collecting or disposing of surgical or diagnostic appliances or instruments for wound clamps A61B17/10; for ligaturing clips A61B17/122; packages or dispensers for surgical gloves or finger-stalls A61B42/40
• CPC Class Codes: A61B 50/33 Trays
• CPC Class Codes: A61B 50/34 Baskets
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30

Abstract

A rotational correction system includes an implant having first and second sections, the implant having a rotatable permanent magnet disposed in a housing of the first section, the rotatable permanent magnet mechanically connected to a nut operatively coupled to the second section. A keyed portion is interposed between the nut and one or more non-linear grooves disposed on an inner surface of the housing. An external adjustment device having at least one rotatable magnet configured to rotate the rotatable permanent magnet of the implant is part of the system. Rotation of the rotatable permanent magnet of the implant in a first direction effectuates a clockwise change in the rotational orientation of the first section relative to the second section and rotation of the rotatable permanent magnet of the implant in a second direction effectuates a counter-clockwise change in the rotational orientation of the first section relative to the second section.

Claims

1. A method for altering rotational alignment of two sections of a patient'"'"'s bone, comprising:

providing an intramedullary rotational correction device comprising;

a first portion configured to be secured to a first section of bone;

a second portion configured to be secured to a second section of bone;

an actuator disposed in the first portion; and

a rotary nut, the rotary nut having one or more non-linear spline configured to communicate with a non-linear groove of the first portion, wherein upon a rotation of the rotary nut by the actuator the non-linear spline of the rotary nut is configured to communicate with the non-linear groove of the first portion and rotate the first portion relative to the second portion;

securing the first portion of a intramedullary rotational correction device to a first section of a patient'"'"'s bone;

securing the second portion of the intramedullary rotational correction device to a second section of the patient'"'"'s bone;

positioning an external adjustment device in external proximity to the patient'"'"'s bone, the external adjustment device configured to activate the actuator disposed within the intramedullary rotational correction device; and

operating the external adjustment device to activate the actuator of the intramedullary rotational correction device, the actuator thereby causing a rotation of the second portion of the intramedullary rotational correction device with respect to the first portion of the intramedullary rotational correction device.

2. The method of claim 1, wherein the actuator comprises a rotatable permanent magnet.

3. The method of claim 2, wherein the external adjustment device comprises one or more rotatable magnets configured to generate a rotating magnetic field.

4. The method of claim 3, wherein the rotating magnetic field causes the rotatable permanent magnet of the intramedullary rotational correction device to rotate and thereby effectuate a change in the rotational orientation of the second portion relative to the first portion.

5. The method of claim 2, wherein the rotary nut is in mechanical communication with a lead screw, the lead screw operatively connected to the rotatable permanent magnet and configured to be rotated by the operating of the external adjustment device.

6. The method of claim 5, wherein a slip clutch is located between the magnet and the lead screw and configured to prevent binding of the rotatable permanent magnet and the lead screw.

7. The method of claim 1, wherein the one or more non-linear splines are located on at least a portion of a surface of the rotary nut, the one or more non-linear splines are configured to interface with corresponding non-linear grooves disposed along an inner surface of the first portion of the intramedullary rotational correction device.

8. The method of claim 7, wherein one or more of the non-linear splines disposed on the rotary nut, and the non-linear grooves on the inner surface of the first portion, form a helical arrangement.

9. The method of claim 8, wherein one or more ball bearings are disposed between the non-linear grooves of the rotary nut and the first portion.

10. A intramedullary rotational correction device, comprising:

a first portion comprising a housing and configured to be secured to a first section of a patient'"'"'s bone;

a second portion comprising a shaft and configured to be secured to a second section of the patient'"'"'s bone;

an actuator disposed within the housing of the first portion; and

a rotary nut, the rotary nut having one or more non-linear spline configured to communicate with a non-linear groove of the first portion, wherein upon a rotation of the rotary nut by the actuator the non-linear spline of the rotary nut is configured to communicate with the non-linear groove of the first portion and rotate the first portion relative to the second portion.

11. The intramedullary rotational correction device of claim 10, wherein the actuator comprises a rotatable permanent magnet.

12. The intramedullary rotational correction device of claim 11, further comprising:

an external adjustment device comprising at least one rotatable magnet configured to rotate the rotatable permanent magnet, and rotate the second portion in relation to the first portion.

13. The intramedullary rotational correction device of claim 12, comprising a lead screw operatively coupled to the rotatable permanent magnet.

14. The intramedullary rotational correction device of claim 13, the rotary nut in communication with the lead screw, wherein rotation of the rotatable permanent magnet rotates the lead screw which rotates the rotary nut, the rotary nut thereby rotating the second portion in relation to the first portion.

15. The intramedullary rotational correction device of claim 10, comprising one or more planetary gear set.

16. The intramedullary rotational correction device of claim 10, comprising one or more extension portion.

17. The intramedullary rotational correction device of claim 10, the one or more non-linear splines located on at least a portion of a surface of the rotary nut, the one or more non-linear splines configured to interface with corresponding non-linear grooves disposed along an inner surface of the first portion of the intramedullary rotational correction device.

18. The intramedullary rotational correction device of claim 17, wherein one or more of:

the non-linear splines disposed on the rotary nut and the non-linear grooves on the inner surface of the first portion, form a helical arrangement.

19. The intramedullary rotational correction device of claim 18, further comprising one or more ball bearing disposed between the non-linear grooves of the rotary nut and the first portion.