Implantable bone adjustment devices

Patent metadata

Field	Value
Publication number	US-11278330-B2
Application number	US-201816482111-A
Country	US
Kind code	B2
Filing date	Jan 29, 2018
Priority date	Feb 2, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A reconfigurable bone adjustment device (1, 101, 201) includes a first member (10,110, 210, 1010) configured for attachment to a first bone fragment, a second member (20, 130, 230, 1030) configured for attachment to a second bone fragment and a reconfiguration assembly (2, 102, 401, 501, 601, 701, 801, 901, 1020) configured to move the second member relative to the first member. The reconfiguration assembly includes a drive mechanism (50, 150, 250, 440, 540, 640, 740, 840, 940, 1050) and a threaded rod (70, 170, 245, 470, 570, 670, 770, 870, 970, 1070, 1170) operatively coupled to the drive mechanism so that rotation of the drive mechanism rotates the threaded rod. The reconfiguration assembly operates to reduces stresses, forces, bending moments and/or eccentric moments on a junction and/or by configuring the junction in a manner whereby one of more of the forces, is isolated away from the junction.

First claim

The invention claimed is:

1. A reconfigurable bone adjustment device comprising:
a first member configured for attachment to a first bone fragment;
a second member configured for attachment to a second bone fragment; and
a reconfiguration assembly configured to move the second member relative to the first member, the reconfiguration assembly including:
a drive mechanism including a driver, the drive mechanism operable to controllably rotate the driver; and
a threaded rod having a proximal end operatively coupled to the driver at a junction so that rotation of the drive mechanism rotates the driver, which rotates the threaded rod; and
a collar positioned between the driver and the second member such that rotation of the threaded rod in a first direction exerts a compressive force between a distal surface of the driver and a proximal surface of the collar, and between a distal surface of the collar and a proximal end of the second member, the distal surface of the collar includes a convex surface for contacting a complementary concave surface formed on the proximal end of the second member, the complementary convex and concave surfaces forming an interface for transmitting the compressive force.

2. The reconfigurable bone adjustment device of claim 1 , wherein the reconfigurable bone adjustment device is an intramedullary limb lengthening nail.

3. The reconfigurable bone adjustment device of claim 1 , wherein the reconfigurable bone adjustment device is an intramedullary bone transport nail.

4. The reconfigurable bone adjustment device of claim 1 , wherein the drive mechanism is an internal magnet adapted for rotation via an external magnetic actuator.

5. A reconfigurable bone adjustment device comprising:
a first member configured for attachment to a first bone fragment;
a second member configured for attachment to a second bone fragment; and
a reconfiguration assembly configured to move the second member relative to the first member, the reconfiguration assembly including:
a drive mechanism including a driver, the drive mechanism operable to controllably rotate the driver; and
a threaded rod having a proximal end operatively coupled to the driver at a junction so that rotation of the drive mechanism rotates the driver, which rotates the threaded rod, the threaded rod including a first distal segment having a first diameter and a second proximal segment adjacent the proximal end of the threaded rod, the second proximal segment having a second diameter, the second diameter being greater than the first diameter;
wherein the second proximal segment includes a tapered surface extending from the proximal end of the threaded rod to the first distal segment, rotation of the threaded rod causes the tapered surface of the second proximal segment to contact a proximal end of the second member.

6. The reconfigurable bone adjustment device of claim 5 , wherein the reconfigurable bone adjustment device is an intramedullary limb lengthening nail.

7. The reconfigurable bone adjustment device of claim 5 , wherein the reconfigurable bone adjustment device is an intramedullary bone transport nail.

8. The reconfigurable bone adjustment device of claim 5 , wherein the drive mechanism is an internal magnet adapted for rotation via an external magnetic actuator.

9. A reconfigurable bone adjustment device comprising:
a first member configured for attachment to a first bone fragment;
a second member configured for attachment to a second bone fragment; and
a reconfiguration assembly configured to move the second member relative to the first member, the reconfiguration assembly including:
a drive mechanism including a driver, the drive mechanism operable to controllably rotate the driver; and
a threaded rod having a proximal end operatively coupled to the driver at a junction so that rotation of the drive mechanism rotates the driver, which rotates the threaded rod, the threaded rod including a first distal segment having a first diameter, a second proximal segment adjacent the proximal end of the threaded rod, the second proximal segment having a second diameter, the second diameter being greater than the first diameter, and a third segment having a third diameter, the third diameter being greater than the first diameter and the second diameter; wherein the third segment is located in-between the first and second segments.

10. The reconfigurable bone adjustment device of claim 9 , wherein the third segment includes an enlarged spherical segment.

11. The reconfigurable bone adjustment device of claim 10 , wherein the enlarged spherical segment includes an articulating surface for contacting a proximal end of the second member.

12. The reconfigurable bone adjustment device of claim 11 , wherein the articulating surface of the enlarged spherical segment and the proximal end of the second member include corresponding concave and convex articulating surfaces.

13. The reconfigurable bone adjustment device of claim 11 , wherein the articulating surface of the enlarged spherical segment and the proximal end of the second member include corresponding spherical articulating surfaces.

14. The reconfigurable bone adjustment device of claim 9 , wherein the reconfigurable bone adjustment device is an intramedullary limb lengthening nail.

15. The reconfigurable bone adjustment device of claim 9 , wherein the reconfigurable bone adjustment device is an intramedullary bone transport nail.

16. The reconfigurable bone adjustment device of claim 9 , wherein the drive mechanism is an internal magnet adapted for rotation via an external magnetic actuator.

17. A reconfigurable bone adjustment device comprising:
a first member configured for attachment to a first bone fragment;
a second member configured for attachment to a second bone fragment; and
a reconfiguration assembly configured to move the second member relative to the first member, the reconfiguration assembly including:
a drive mechanism including a driver, the drive mechanism operable to controllably rotate the driver; and
a threaded rod having a proximal end operatively coupled to the driver at a junction so that rotation of the drive mechanism rotates the driver, which rotates the threaded rod;

wherein the junction includes a stop component coupled to the threaded rod adjacent to the proximal end of the threaded rod and a spacer component, the spacer component including:
a bore dimensioned to permit passage of the threaded rod therethrough;
a distal surface configured to contact a proximal end of the second member; and
a cavity extending from a proximal side of the spacer component, the cavity dimensioned to receive the stop component therein.

18. The reconfigurable bone adjustment device of claim 17 , wherein the cavity formed in the spacer component and the stop component have complementary surfaces so that rotation of the spacer component rotates the stop component.

19. The reconfigurable bone adjustment device of claim 17 , wherein the stop component includes a body having an aperture and the threaded rod includes an aperture, the aperture formed in the body and the aperture formed in the threaded rod being aligned with one another for receiving a pin therethrough, the pin includes a first end, a second end, and a length defined by the first and second ends, the length of the pin being greater than an outer dimension of the body so that the first and second ends of the pin extend beyond the body of the stop component, the spacer component including a channel for receiving the first and se

Assignees

• Smith & Nephew Inc

Inventors

• Janda Haden
• Bell Paul
• Farley Daniel
• Janna Sied W

Classifications

• A61B2017/00876

  magnetic · CPC title

• A61B17/7216 Primary

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

• A61B2017/681

  Alignment, compression, or distraction mechanisms · CPC title