Minimally invasive interspinous process spacer implants and methods

Patent metadata

Field	Value
Publication number	US-10729476-B2
Application number	US-201815935734-A
Country	US
Kind code	B2
Filing date	Mar 26, 2018
Priority date	Nov 6, 2009
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

An interspinous process spacer for implantation in an interspinous space between a superior spinous process and an inferior spinous process includes a balloon-like body, a first deployable protrusion and a second deployable protrusion. The body has a distal end, a proximal end and a longitudinal axis extending between the proximal and distal ends. The spacer is arrangeable in an unexpanded configuration and an expanded configuration. The first deployable protrusion is mounted proximate the proximal end and the second deployable protrusion is mounted proximate the distal end. The first and second deployable protrusions are oriented generally parallel to the longitudinal axis in the unexpanded configuration and generally perpendicular to the longitudinal axis in the expanded configuration.

First claim

What is claimed:

1. An interspinous process spacer for implantation in an interspinous space between a superior spinous process and an inferior spinous process, the interspinous process spacer comprising:
an implant body;
a central shaft extending within the implant body; and
a first arm and a second arm coupled to the central shaft;
wherein in an undeployed configuration the first and second arms are at least partially wrapped around the central shaft,
wherein in a deployed configuration the first and second arms are unwound from the central shaft via rotation of the central shaft and extend away from the implant body;
wherein in the deployed configuration the first arm extends through a first slot formed through an outer surface of the implant body,
wherein in the deployed configuration the second arm extends through a second slot formed through the outer surface of the implant body;
wherein in the deployed configuration a portion of the first and second arms that extends from the implant body has a concave curvature with respect to a curvature of the implant body;
wherein in the undeployed configuration the first and second arms are wrapped around the central shaft up to the portion having the concave curvature,
wherein a portion of the first and second arms wrapped around the central shaft has a convex curvature with respect to a corresponding convex curvature of the implant body.

2. The interspinous process spacer of claim 1 , wherein in the deployed configuration the first and second arms extend away from the implant body at locations on opposite sides of the implant body.

3. The interspinous process spacer of claim 1 , wherein the first slot is located at a position 180-degrees around a circumferential perimeter of the implant body from the second slot.

4. The interspinous process spacer of claim 1 , wherein in the deployed configuration a portion of the first and second arms that extends from the implant body has a curvature opposite a curvature of a portion of the first and second arms located within the implant body.

5. The interspinous process spacer of claim 1 , wherein the central shaft rotates independently of the implant body.

6. The interspinous process spacer of claim 5 , wherein the implant body defines a generally cylindrically-shaped main body portion coupled to a tapered nose cone provided at a distal end of the implant body,
wherein the central shaft is fixedly coupled to the nose cone to facilitate rotational movement of the central shaft with respect to the implant body.

7. The interspinous process spacer of claim 6 , wherein the implant body further includes a proximal end plate coupled to the main body portion, the proximal end plate including an opening for receiving a proximal end of the central shaft,
wherein the proximal end of the central shaft includes an engagement feature for receiving rotational input forces from a user.

8. The interspinous process spacer of claim 1 further including:
a collar extending circumferentially around the central shaft, the collar securing the first and second arms to the central shaft such that rotation of the central shaft results in a corresponding rotation of the collar and movement of the first and second arms between the undeployed and deployed configurations.

9. The interspinous process spacer of claim 8 , wherein the collar includes a projection extending in a direction away from a longitudinal axis of the central shaft, the projection contacting the first arm in the undeployed configuration to direct an unwound portion of the first arm in a direction away from the longitudinal axis of the central shaft.

10. The interspinous process spacer of claim 1 wherein the central shaft includes a first longitudinally extending slot receiving a proximal end of the first arm and a second longitudinally extending slot receiving a proximal end of the second arm,
wherein the first arm includes an anchor portion extending generally perpendicular to the first arm within the first longitudinally extending slot,
wherein the second arm includes an anchor portion extending generally perpendicular to the second arm within the second longitudinally extending slot.

11. The interspinous process spacer of claim 1 , wherein the first and second arms are formed of a resilient material and bend to wrap around the central shaft in the undeployed configuration.

12. The interspinous process spacer of claim 1 further including:
a third arm coupled to the central shaft; and
a fourth arm coupled to the central shaft at a location circumferentially opposite the third arm;
wherein in the undeployed configuration the third and fourth arms are at least partially wrapped around the central shaft,
wherein in the deployed configuration the third and fourth arms are unwound from the central shaft via rotation of the central shaft and extend away from the implant body,
wherein the first and second arms are coupled to a proximal end of the central shaft and the third and fourth arms are coupled to a distal end of the central shaft.

13. The interspinous process spacer of claim 12 , wherein in the deployed configuration, at least one of the first, second, third and fourth arms extend through a corresponding first, second, third and fourth slot formed through an outer surface of the implant body.

14. An interspinous process spacer for implantation in an interspinous space between a superior spinous process and an inferior spinous process, the interspinous process spacer comprising:
an implant body;
a sleeve extending within the implant body;
a rotatable central shaft extending co-axially within the sleeve;
a first arm and a second arm coupled to the central shaft;
wherein in an undeployed configuration the first and second arms are at least partially wrapped around the central shaft,
wherein in a deployed configuration the first and second arms are unwound from the central shaft via rotation of the central shaft and extend away from the central shaft and through first and second slots, respectively, provided in the sleeve;
wherein the first and second arms are coupled at the central arm portion that extends through the central shaft such that proximal ends of the first and second arms are coupled to the central arm portion and distal ends of the first and second arms extend away from the central shaft.

15. The interspinous process spacer of claim 14 , wherein the first slot extends at an angle with respect to an inner and outer surface of the sleeve,
wherein the second slot extends at an angle with respect to the inner and outer surface of the sleeve.

16. The interspinous process spacer of claim 14 , wherein the first and second slots include a curvature corresponding to a curvature of the first and second arms, respectively.

Assignees

• Depuy Synthes Products Inc

Inventors

• Thommen Daniel
• Weber Markus
• Teisen Jacques
• Kraft Markus
• Kaufmann Florian
• Hunziker Markus
• Aschmann Felix
• Saladin Stefan
• Oswald Martin
• Randegger Roman

Classifications

• A61F2/44

  for the spine, e.g. vertebrae, spinal discs · CPC title

• A61M29/00

  Dilators with or without means for introducing media, e.g. remedies · CPC title

• A61B17/70 Primary

  Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant · CPC title

• A61B90/39

  Markers, e.g. radio-opaque or breast lesions markers · CPC title

• A61B17/7065 Primary

  Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor · CPC title