Expandable intramedullary systems and methods of using the same

Patent metadata

Field	Value
Publication number	US-10092333-B2
Application number	US-201514946914-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Nov 20, 2015
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

Intramedullary systems, expandable intramedullary nails, expandable anchors, and methods of using the same. The intramedullary system may include an expandable intramedullary nail configured to extend into an intramedullary canal of a long bone and/or one or more expandable anchors configured to extend at an angle transverse to the intramedullary nail. The intramedullary nails and/or anchors may include one or more integrated expansion mechanisms that allow for insertion in a contracted configuration and expansion into a deployed configuration to lock the relative position and prevent axial rotation and translation of the system.

First claim

What is claimed is:

1. An expandable anchor for stabilizing a long bone comprising:
an elongate anchor body having a longitudinal axis and a proximal portion and a distal portion, the anchor body configured to extend substantially transverse to an intramedullary canal of a long bone;
an actuation mechanism extending longitudinally through the anchor body; and
at least one expandable securing member engaged with the actuation mechanism and disposed in the distal portion of the anchor body in a contracted position, wherein, upon mechanical actuation of the at least one securing member, the at least one securing member linearly and non-pivotably extends in a direction perpendicular to the longitudinal axis from the anchor body to an expanded position to securely anchor the distal portion of anchor,
wherein the expandable securing mechanism is engaged with the actuation mechanism in the contracted position and the expanded position.

2. The anchor of claim 1 , wherein the at least one securing member deploys from the anchor body upon linear movement of the actuation mechanism.

3. The anchor of claim 1 , wherein the at least one securing member deploys from the anchor body when the actuation mechanism moves toward the distal portion of the anchor body.

4. The anchor of claim 1 , wherein the actuation mechanism includes an adjustment member, and the at least one securing member is configured to deploy into the expanded position when an axial force is applied to the adjustment member.

5. The anchor of claim 4 , wherein a proximal end of the actuation mechanism includes a recess configured to receive a tool for applying the axial force to the adjustment member.

6. The anchor of claim 4 , wherein the adjustment member includes one or more angled projections configured to engage partial threads arranged on an inner surface of the anchor body to provide for ratchet-like advancement of the adjustment member.

7. The anchor of claim 6 , wherein the adjustment member is rotatable such that the one or more angled projections align with at least one smooth portion on the inner surface of the anchor body such that the adjustment member is permitted to move proximally, thereby allowing the one or more securing members to retract.

8. The anchor of claim 1 , wherein the actuation mechanism includes a deployment member connected to an adjustment member, and a head of the adjustment member is positioned in a slot of the deployment member to interconnect the adjustment member to the deployment member.

9. The anchor of claim 1 , wherein the actuation mechanism includes a deployment member, wherein the deployment member is arranged with at least one angled tongue or groove configured to engage with a corresponding angled groove or tongue on the at least one securing member such that translational movement of the deployment member causes the at least one securing member to deploy to the expanded position.

10. The anchor of claim 1 , wherein the at least one securing member includes a first securing member and a second securing member, and the first and second securing members are configured to deploy simultaneously.

11. The anchor of claim 10 , wherein the actuation mechanism includes a deployment member, wherein the first securing member engages a first face of the deployment member and the second securing member engages a second face of the deployment member opposite to the first face.

12. The anchor of claim 11 , wherein the first securing member deploys in a first direction and the second securing member deploys in a second direction opposite to the first direction, the first and second securing members being substantially parallel and offset from one another when deployed.

13. The anchor of claim 1 , wherein the at least one securing member deploys from the anchor body with continuous and discrete adjustments.

14. The anchor of claim 1 , wherein the long bone is a femur, tibia, fibula, humerus, radius, ulna, or phalange.

15. An expandable anchor for stabilizing a long bone comprising:
a cannulated elongate anchor body having a proximal portion and a distal portion;
an elongate actuation mechanism extending longitudinally through the anchor body, and configured to move longitudinally through the anchor body;
one or more expandable securing members engaged with the actuation mechanism and disposed in the anchor body in a contracted position, wherein, upon linear translation of the actuation mechanism toward the distal portion of the anchor body, the one or more securing members linearly and non-pivotably extend from the anchor body to an expanded position to securely anchor the distal portion of anchor body,
wherein the extendable securing members are engaged with the actuation mechanism in the contracted position and the expanded position.

16. The anchor of claim 15 , wherein a distal portion of the actuation mechanism is arranged with at least one angled tongue or groove configured to engage with at least one corresponding angled groove or tongue on the one or more securing members such that the linear translation of the actuation mechanism towards the distal portion of the anchor body causes the one or more securing members to deploy to the expanded position.

17. The anchor of claim 15 , wherein the actuation mechanism includes an adjustment member connected to a deployment member, and the one or more securing members are configured to deploy into the expanded position when an axial force is applied to the adjustment member.

18. The anchor of claim 17 , wherein the adjustment member includes one or more angled projections configured to engage partial threads arranged on an inner surface of the anchor body to provide for ratchet-like advancement of the adjustment member.

19. The anchor of claim 18 , wherein the adjustment member is rotatable such that the angled projections align with at least one smooth portion on the inner surface of the anchor body such that the adjustment member is permitted to move proximally, thereby allowing the one or more securing members to retract.

20. An expandable anchor for stabilizing a long bone comprising:
a cannulated elongate anchor body having a proximal portion and a distal portion configured to be positioned through an opening in an intramedullary nail and transverse to the intramedullary nail;
an actuation mechanism including a deployment member connected to an adjustment member extending longitudinally through the anchor body; and
at least one expandable securing member engaged with the deployment member and configured to non-pivotably deploy the at least one securing member from the anchor body along a linear trajectory upon linear movement of the adjustment member toward the distal portion of the anchor body,
wherein the expandable securing member is engaged with the actuation mechanism in the contracted position and the expanded position.

Assignees

• Globus Medical Inc

Inventors

• Jansen David

Classifications

• A61B17/7225

  for bone compression · CPC title

• A61B17/7275

  with expanding cylindrical parts · CPC title

• A61B17/7266

  with fingers moving radially outwardly · CPC title

• A61B17/7216

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

• A61B17/744 Primary

  the longitudinal elements coupled to an intramedullary nail · CPC title