Dual-shaft implant expansion driver with reversible driver key mechanism and expandable intervertebral implant system

Patent metadata

Field	Value
Publication number	US-11344434-B2
Application number	US-202016868747-A
Country	US
Kind code	B2
Filing date	May 7, 2020
Priority date	May 7, 2020
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A surgical driver apparatus includes a housing and an inner driver shaft having a proximal end secured within the housing and a distal end extending out from a first side of the housing. The inner driver shaft is configured to rotate with respect to the housing. The surgical driver apparatus further includes an outer driver shaft and an idler driver shaft. The outer driver shaft is positioned coaxial with the inner driver shaft and configured to rotate independently from the inner driver shaft. The idler driver shaft is configured to transmit torque to the outer driver shaft. Additionally, the surgical driver apparatus includes a driver key comprising a driving feature and a counter-driving feature. The driver key is configured to engage a second side of the housing in one of a plurality of orientations configured to rotate the inner driver shaft and/or the outer driver shaft.

First claim

What is claimed is:

1. A surgical driver apparatus for engagement with and insertion of an expandable intervertebral implant, comprising:
a housing;
an inner driver shaft having a proximal end secured within the housing and a distal end extending out from a first side of the housing, the inner driver shaft configured to rotate with respect to the housing;
an outer driver shaft positioned coaxial with the inner driver shaft and extending out from the first side of the housing, the outer driver shaft configured to rotate independently from the inner driver shaft;
an idler driver shaft secured within the housing and mechanically connected to the outer driver shaft, wherein rotation of the idler driver shaft transmits torque to the outer driver shaft; and
a driver key comprising a driving feature and a counter-driving feature, wherein the driver key is configured to engage a second side of the housing in one of a plurality of orientations configured to rotate the inner driver shaft and/or the outer driver shaft;
wherein the plurality of orientations comprise:
a first orientation in which the driving feature engages the inner driver shaft to rotate the inner driver shaft via rotation of the driving feature and the counter-driving feature engages with the idler driver shaft to restrain rotation of the outer driver shaft;
a second orientation in which the driving feature engages with the idler driver shaft to rotate the outer driver shaft via rotation of the idler driver shaft resulting from rotation of the driving feature and the counter-driving feature engages with the inner driver shaft to restrain rotation of the inner driver shaft; and
a third orientation in which the driving feature engages with the inner driver shaft and the idler driver shaft to rotate the inner driver shaft and the outer driver shaft via rotation of the driving feature.

2. The surgical driver apparatus of claim 1 , wherein the counter-driving feature is disposed outside of the housing in the third orientation.

3. The surgical driver apparatus of claim 1 , wherein the idler driver shaft is positioned parallel to the inner driver shaft.

4. The surgical driver apparatus of claim 1 , wherein the second side of the housing is disposed opposite the first side of the housing.

5. The surgical driver apparatus of claim 1 , wherein the inner driver shaft comprises an inner socket feature and the idler driver shaft comprises an idler gear feature radially aligned with the inner socket feature.

6. The surgical driver apparatus of claim 5 , wherein the driving feature comprises an internal socket and an external gear feature at a mating end of the driving feature.

7. The surgical driver apparatus of claim 6 , wherein the internal socket of the driving feature is configured to engage the inner socket feature of the inner driver shaft in the third orientation, and wherein the external gear feature of the driving feature is configured to mesh with the idler gear feature of the idler driver shaft in the third orientation.

8. The surgical driver apparatus of claim 6 , wherein the idler driver shaft comprises an idler socket feature extending axially from the idler gear feature in a direction opposite the first side of the housing.

9. The surgical driver apparatus of claim 8 , wherein the internal socket of the driving feature engages the inner socket feature of the inner driver shaft in the first orientation, and wherein the counter-driving feature engages the idler socket feature in the first orientation.

10. The surgical driver apparatus of claim 8 , wherein the internal socket of the driving feature engages the idler socket feature of the idler driver shaft in the second orientation, and wherein the counter-driving feature engages the inner socket feature of the inner driver shaft in the second orientation.

11. A surgical implant system, comprising:
an expandable intervertebral implant, wherein the expandable intervertebral implant comprises:
an upper endplate;
a lower endplate;
a frame;
a plurality of moveable actuators received in the frame and positioned between the upper endplate and the lower endplate; and
an actuator screw that extends through the plurality of moveable actuators from an anterior end of the implant, wherein rotation of the plurality of moveable actuators with respect to the actuator screw causes at least one of the plurality of moveable actuators to move with respect to the actuator screw, thereby causing the implant to expand to a parallel expansion configuration, an anterior expansion configuration, or a posterior expansion configuration;
and
a surgical driver for engagement with and insertion of the expandable intervertebral implant, wherein the surgical driver comprises:
a housing;
an inner driver shaft having a proximal end secured within the housing and a distal end extending out from a first side of the housing, the inner driver shaft configured to rotate with respect to the housing;
an outer driver shaft positioned coaxial with the inner driver shaft and extending out from the first side of the housing, the outer driver shaft configured to rotate independently from the inner driver shaft;
an idler driver shaft secured within the housing and mechanically connected to the outer driver shaft, wherein rotation of the idler driver shaft transmits torque to the outer driver shaft; and
a driver key comprising a driving feature and a counter-driving feature, wherein the driver key is configured to engage a second side of the housing in:
a first orientation to expand the implant toward the parallel expansion configuration, wherein in the first orientation, the driving feature engages with the inner driver shaft to rotate the inner driver shaft via rotation of the driving feature and the counter-driving feature engages with the idler driver shaft to restrain rotation of the outer driver shaft;
a second orientation to expand the implant toward the anterior expansion configuration, wherein in the second orientation, the driving feature engages with the idler driver shaft to rotate the outer driver shaft via rotation of the idler driver shaft resulting from rotation of the driving feature and the counter-driving feature engages with the inner driver shaft to restrain rotation of the inner driver shaft; or
a third orientation to expand the implant toward the posterior expansion configuration, wherein in the third orientation, the driving feature engages with the inner driver shaft and the idler driver shaft to rotate the inner driver shaft and the outer driver shaft via rotation of the driving feature.

12. The surgical implant system of claim 11 , wherein the inner driver shaft is configured to engage the actuator screw, and wherein the outer driver shaft is configured to engage an anterior actuator of the plurality of moveable actuators, the anterior actuator disposed proximate an anterior end of the implant.

13. The surgical implant system of claim 11 , wherein the surgical driver further comprises a spring configured to bias the outer driver shaft in a direction toward the anterior actuator.

14. The surgical implant system of claim 11 , further comprising a measurement device comprising an inner shaft thread follower configured to measure a posterior expansion height for a posterior portion of the implant, the inner shaft thread follower having a threaded carriage and a button dial, the threaded carriage having internal threads configured to mesh with a threaded portion of the inner driver shaft and the button dial disposed at least partially within a slot in the housing and configured to move along the slot in response to movement of the inner

Assignees

• Globus Medical Inc

Inventors

• Flint Brian
• Mclaughlin Colm

Classifications

• A61F2/4657

  Measuring instruments used for implanting artificial joints (for surgical instruments A61B90/06) · CPC title

• A61F2002/4668

  for measuring angles · CPC title

• A61F2002/30785

  parallel · CPC title

• A61F2002/30578

  having apertures, e.g. for receiving fixation screws · CPC title

• A61F2002/30507

  using a threaded locking member, e.g. a locking screw or a set screw · CPC title