US 8,523,909 B2 · Interspinous process implants having deployable engagement arms

Abstract

Spinal implants include an elongated body portion dimensioned and configured for percutaneous introduction into a target interspinous process space, at which interspinous distraction and/or spinal fusion are desired. The body portion can include a threaded outer surface, or alternatively a smooth surface. The body portion can include one or more interior cavities, and can include deployable engagement members adapted and configured to move in tandem between a stowed position retracted within the interior cavity of the body portion and a deployed position extended from the interior cavity of the body for engaging adjacent spinous processes. An internal drive assembly for selectively moving the engagement members from the stowed position to the deployed position can be provided, as can a elements for locking the engagement members in a deployed position.

Drawings

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Drawings

Claims20

Dependent claims

A spinal implant for insertion into an interspinous process space comprising:

a) an elongated body portion dimensioned and configured for percutaneous introduction into the interspinous process space, the body portion defining an interior cavity;
b) a pair of laterally opposed engagement members mounted for movement between a first position stowed within the interior cavity of the body portion and a second position deployed from the interior cavity of the body portion to engage the spinous process, each engagement member including a central hub defining a common hub axis and an inwardly facing bevel gear, wherein the inwardly facing bevel gears of the two central hubs oppose one another within the interior cavity of the body portion along the hub axis;
and
c) an elongated drive shaft extending into the interior cavity and mounted for axial rotation about a shaft axis thereof, the drive shaft including a forwardly facing bevel gear for operatively meshing with the two opposed inwardly facing bevel gears of the central hubs, wherein axial rotation of the drive shaft about the shaft axis causes the pair of laterally opposed engagement members to rotate about the hub axis and thereby move between the first and second positions, wherein each engagement member is mounted for rotation about a pin extending along the hub axis which is substantially transverse to the shaft axis.

1 more element

A spinal implant for insertion into an interspinous process space between spinous process comprising:

a) a body portion dimensioned and configured for percutaneous introduction into the interspinous process space, the body portion defining an interior cavity and a journal chamber;
b) two engagement members mounted for selective extension into and partially out of the interior cavity for selectively engaging the spinous process,
wherein each engagement member includes:
a central hub having a plurality of beveled gear teeth, and opposing arms extending radially outwardly from the central hub;
c) a drive assembly including a drive shaft extending into the interior cavity,
wherein the drive shaft includes:
a transmission end with a plurality of beveled gear teeth for operatively meshing with the beveled gear teeth on the central hubs to facilitate transmission of torque therebetween;
a medial support flange nestled in the journal chamber;
and a proximal section terminating in an end for cooperating with a deployment device;
and
d) an annular bushing mounted on the drive shaft within the journal chamber to support axial rotation of the drive shaft,
wherein in operation, the two engagement members are retracted within the interior cavity during placement of the implant into the interspinous space by the deployment device and, once placed, the deployment device is used to rotate the drive assembly to partially extend the two engagement members such that the opposing arms engage the spinous processes to fix the implant in place.

9 more elements

Dependencies are inferred from the claim text.

Description5,875 words

Summary1,725 words

#1. Field of the Invention

#The subject invention is directed to spinal implants, and more particularly, to an interspinous process implant with a threaded body and deployable engagement arms for percutaneous placement in the interspinous process space to treat lumbar spinal stenosis.

#2. Description of Related Art

Brief description of the drawings16 figures

#So that those skilled in the art to which the subject invention appertains will readily understand how to make and use the interspinous implant of the subject invention without undue experimentation, preferred embodiments thereof will be described in detail herein below with reference to certain figures, wherein:

#FIG. 1 is a perspective view of an interspinous implant constructed in accordance with a preferred embodiment of the subject invention, which includes a threaded body portion (shown in phantom view) dimensioned and configured for percutaneous introduction into the interspinous process space of a patient and a set of engagement arms for selectively engaging the spinous process, the engagement arms being disposed in a stowed position within the interior cavity of the threaded body portion;

#FIG. 2 is a perspective view of the interspinous implant of FIG. 1, with the engagement arms disposed in a deployed position extending from the interior cavity of the threaded body portion;

Detailed description3,633 words

#Referring now FIG. 1, there is illustrated one exemplary embodiment of an interspinous implant constructed in accordance with a preferred embodiment of the subject invention and designated generally by reference numeral 10. Implant 10 is particularly well adapted for use in performing minimally invasive surgical procedures for treating spinal stenosis, including, for example, interspinous process decompression (IPD).

#It is envisioned however, that the implant 10 of the subject invention can be used in other spinal procedures as well, including, but not limited to as an adjunct to spinal fusion procedures, or as a spinal stabilization device. Those skilled in the art will readily appreciate from the following description that the interspinous process implant of the subject invention is well adapted for percutaneous insertion, and thus overcomes many of the deficiencies of prior art devices presently used in IPD procedures. That is, the implant 10 is dimensioned and configured for introduction and placement through a small skin incision rather than in an open surgical procedure involving a cut down of tissue.

#Referring to FIGS. 1 through 5, the interspinous implant 10 of the subject invention includes a threaded body portion 12 having right and left body sections 12a, 12b. The body sections 12a, 12b are held together in part by a securement pin 14 located adjacent the tapered nose cone 15 of the implant body 12.

Facts

Application

13/402,753Filed 22 Feb 2012 · continuation

Priority

1 May 2007

Published

US 2012/0150229 A114 Jun 2012

Granted

3 Sep 2013

Term ends

30 Jan 2028

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification3 codes

A61B 17/7065
Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices: devices with…
A61B 2017/0256
Joint distractors: for the spine
A61B
Medical diagnosis and surgery

Family

Application61/007,916Us provisional application · filed 1 May 2007

Application60/959,799Us provisional application · filed 16 Jul 2007

Application60/961,780Us provisional application · filed 24 Jul 2007

Application61/000,831Us provisional application · filed 29 Oct 2007

Application61/001,430Us provisional application · filed 1 Nov 2007

Application12/011,905Parent of this continuation-in-part · filed 30 Jan 2008

Application61/207,339Us provisional application · filed 11 Feb 2009

Application12/538,068Parent of this continuation · filed 7 Aug 2009

US 8,075,593 B2Parent of this continuation-in-part · filed 13 Dec 2011

US 2012/0150229 A1Pre-grant publication · published 14 Jun 2012

US 8,142,479 B2Parent of this continuation

Application12/538,068Parent of this continuation-in-part

US 2009/0054988 A1Published application

US 2009/0292316 A1Published application

US 8,523,909 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

1 May 2007Priority claimedParent application 61/007,916
22 Feb 2012Application filedUS 13/402,753
14 Jun 2012PublishedUS 2012/0150229 A1
3 Sep 2013GrantedUS 8,523,909 B2
22 Mar 2017Assigned to Spinal Simplicity, LLCassignment of assignor's interest
5 Apr 2017Assigned to Spinal Simplicity, LLCassignment of assignor's interest
12 Oct 2026TodayWithin its term
30 Jan 2028Term endsEstimated

Interspinous process implants having deployable engagement arms

Life of this patent

Interspinous process implants having deployable engagement arms

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims20

Description5,875 words

Drawings

Classification3 codes

Life of this patent

Description5,875 words