U.S. patent application number 13/526277 was filed with the patent office on 2012-12-20 for expandable interspinous device.
Invention is credited to Bryan Okamoto.
Application Number | 20120323276 13/526277 |
Document ID | / |
Family ID | 47354284 |
Filed Date | 2012-12-20 |
United States Patent
Application |
20120323276 |
Kind Code |
A1 |
Okamoto; Bryan |
December 20, 2012 |
EXPANDABLE INTERSPINOUS DEVICE
Abstract
Disclosed is a device that is configured to be implanted
adjacent interspinous processes of a patient. In one aspect, a
spinal implant device comprises: a spacer region adapted to be
positioned between first and second spinous processes of first and
second vertebral bodies to limit movement of the first spinous
process and the second spinous process toward one another; and an
attachment region attached to the spacer region, the attachment
region adapted to attach to the first spinous process via a
fastener, the attachment region comprising a pair of pads having
attachment elements that are configured to attach onto the spinous
process
Inventors: |
Okamoto; Bryan; (Irvine,
CA) |
Family ID: |
47354284 |
Appl. No.: |
13/526277 |
Filed: |
June 18, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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61515541 |
Aug 5, 2011 |
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61498354 |
Jun 17, 2011 |
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Current U.S.
Class: |
606/249 |
Current CPC
Class: |
A61F 2/44 20130101; A61F
2220/0016 20130101; A61B 17/7065 20130101; A61B 2017/681 20130101;
A61B 17/7068 20130101 |
Class at
Publication: |
606/249 |
International
Class: |
A61B 17/70 20060101
A61B017/70 |
Claims
1. A spinal implant device, comprising: a spacer region adapted to
be positioned between first and second spinous processes of first
and second vertebral bodies to limit movement of the first spinous
process and the second spinous process toward one another; and an
attachment region attached to the spacer region, the attachment
region adapted to attach to the first spinous process via a
fastener, the attachment region comprising a pair of pads having
attachment elements that are configured to attach onto the spinous
process.
2. A device as in claim 1, wherein the attachment region attaches
to an anterior segment of the spinous process.
3. A device as in claim 1, wherein the attachment region attaches
to a laminal segment of the spinous process.
4. A device as in claim 1, wherein the attachment region attaches
an anterior segment and a laminal segment of the spinous process.
Description
REFERENCE TO PRIORITY DOCUMENTS
[0001] This application claims priority of co-pending U.S.
Provisional Patent Application Ser. No. 61/515,541 entitled
EXPANDABLE INTERSPINOUS DEVICE and filed on Aug. 5, 2011, and
co-pending U.S. Provisional Patent Application Ser. No. 61/498,354
entitled EXPANDABLE INTERSPINOUS DEVICE and filed on Jun. 17, 2011.
The disclosures of the Provisional Patent Applications are hereby
incorporated by reference in their entirety.
BACKGROUND
[0002] Many people suffers from back pain due to any of a variety
of factors. Such back pain can sometime be treated by introducing
interspinous implants between the spinous processes of adjacent
vertebral bodies in a patient's spine. This can maintain the
stability of the vertebral column to increase the size of the
spinal canal and allow the patient to have normal mobility.
[0003] There currently is need for improved device that can be
implanted between spinous processes.
SUMMARY
[0004] Disclosed is a device that is configured to be implanted
adjacent interspinous processes of a patient. In one aspect, a
spinal implant device comprises: a spacer region adapted to be
positioned between first and second spinous processes of first and
second vertebral bodies to limit movement of the first spinous
process and the second spinous process toward one another; and an
attachment region attached to the spacer region, the attachment
region adapted to attach to the first spinous process via a
fastener, the attachment region comprising a pair of pads having
attachment elements that are configured to attach onto the spinous
process.
[0005] Other features and advantages should be apparent from the
following description of various embodiments, which illustrate, by
way of example, the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 shows a perspective view of a device that is
configured for placement between the spinous processes of two
adjacent vertebral bodies.
[0007] FIG. 2 shows an enlarged, perspective view of the device of
FIG. 1
[0008] FIG. 3 shows a side view of the device of FIG. 1.
[0009] FIG. 4 shows the device positioned between a pair of spinous
processes.
[0010] FIGS. 5-6 show another embodiment of an interspinous
device.
[0011] FIGS. 6-10A show another embodiment of an interspinous
device.
[0012] FIGS. 10B-11 show another embodiment of an interspinous
device.
[0013] FIG. 12 shows another embodiment of an interspinous
device.
[0014] FIG. 13 shows another embodiment of an interspinous
device.
DETAILED DESCRIPTION
[0015] Before the present subject matter is further described, it
is to be understood that this subject matter described herein is
not limited to particular embodiments described, as such may of
course vary. It is also to be understood that the terminology used
herein is for the purpose of describing particular embodiments
only, and is not intended to be limiting. Unless defined otherwise,
all technical terms used herein have the same meaning as commonly
understood by one skilled in the art to which this subject matter
belongs.
[0016] As will be apparent to those of skill in the art upon
reading this disclosure, each of the individual embodiments
described and illustrated herein has discrete components and
features which may be readily separated from or combined with the
features of any of the other several embodiments without departing
from the scope of the subject matter described herein. Any recited
method can be carried out in the order of events recited or in any
other order which is logically possible.
[0017] FIG. 1 shows a perspective view of a device 105 that is
configured for placement between the spinous processes SP1 and SP2
of two adjacent vertebral bodies. FIG. 2 shows an enlarged,
perspective view of the device 105 and FIG. 3 shows a side view of
the device 105. The device 105 includes a spacer or central region
205 that is sized and shaped to fit between the spinous processes
of the two adjacent vertebral bodies. The device 105 further
includes a pair of protrusions 210 that extend outward from the
central region. The protrusions are size and shaped to couple to
the spinous processes, as described more fully below.
[0018] With reference to FIGS. 2 and 3, the central region 205
comprises a cylindrical body having one or more openings that
extend through the walls of the body. In the illustrated
embodiment, the central region 205 is cylindrical and substantially
circular when viewed from the side (as shown in FIG. 3). A central
shaft 305 extends through the central region 205. Along an upper
portion of the central region 205, an elongated gap 208 is formed,
which is sized and shaped to receive a locking member 215, as
described below. It should be appreciated that the central region
205 can have other shapes.
[0019] With reference still to FIGS. 2 and 3, the protrusions 210
comprise outwardly extending bodies or tabs. A pair of such
protrusions extends outwardly from the central region 205 on each
side of the gap 208. A space between each of the protrusions is
sized and shaped to receive at least a portion of a spinous
process. For example, as shown in FIG. 1, the protrusions 210a and
210b define a space therebetween that is sized and shaped to
receive the spinous process SP1. In this manner, the device 105 can
be positioned between the spinous processes SP1 and SP2 with the
protrusions 210 coupling to respective spinous processes to thereby
serve anchoring or stabilizing functions.
[0020] As shown in FIGS. 2 and 3, the locking member 215 is sized
and shaped to fit within the elongated gap 215. In this regard, as
shown in FIG. 3, the elongated gap 215 forms a pair of slots that
are sized and shaped to receive complementary-shaped tabs on the
locking member 215. This permits the locking member 215 to be
slidably positioned into the gap 215 by properly aligning the
locking member adjacent the gap 215 and then sliding the locking
member into the gap along a vector that would be normal to the
plane of FIG. 3. After the locking member is positioned in the gap
215, locking member may be rotated to cause a cam portion of the
locking member to outwardly separate the central region along
opposite sides of the gap 215 and thereby lock the central region
onto the spinous processes.
[0021] This is described in more detail with reference to FIG. 4,
which shows the central region 205 of the device 105 positioned
between a pair of spinous processes SP1 and SP2. At this stage, the
locking member 215 is not coupled to the central region 205. The
locking member 215 can now be slid into the central region and
rotated to cause the cam to expand the central region such that it
exerts a force onto the spinous processes and fixes thereto. Note
that a series of slots 220 (FIG. 2) are located along the wall of
the central region 205. The slots are sized and shaped to receive
at least a portion of a spinous process when the device 105 is
implanted.
[0022] FIG. 5 shows another embodiment of the ISP device, referred
to as device 505. The device 505 includes four members including a
first member 510, second member 515, third member 520, and fourth
member 525. Each of the second, third, and fourth member has a
central shaft or opening that is sized and shaped to receive an
elongated shank 530 such that the members may be coupled to one
another by inserting the shank 530 through the central openings of
the other members. The fourth member 525 serves as a cap with
internal threads that couple to external threads on the shank 530.
In this manner, the fourth member 525 can be secured to the shank
530 with the second and third members 515 and 520 secured along the
shank 530 between the fourth member 525 and an enlarged head 535 of
the first member 510.
[0023] With reference still to FIG. 5, the second member 515 and
third member 520 may be positioned with a space S therebetween.
Each of the second member and third member are sized and shaped to
be positioned adjacent or juxtaposed with a spinous process of a
respective vertebra. The spinous process can be positioned within
the space S and the second and third members tightened about the
spinous process. The cap of the fourth member can then be tightened
to secure the spinous process within the space S.
[0024] FIG. 6 shows another embodiment of the ISP device, referred
to as device 605. The device 605 includes a main body 610 that is
sized and shaped to be positioned within the space between a pair
of spinous processes. The main body may be coupled to an expander
member 615 that threadably inserts into an opening 625 in the main
body 610.
[0025] The main body 610 has a substantially tubular configuration
with an internal shaft and an out wall that forms a substantially
cylindrical shape. A plurality of openings extend through the outer
wall and communicate with the internal shaft.
[0026] The expander member 615 is elongated in shape and has a
threaded shank that fits into the opening 625 of the main body. The
expander member 615 can be rotated to engage with threads inside
the opening 625 to engage the expander member 615 with the main
body 610.
[0027] Any of the device embodiments can be made of any
biologically adaptable or compatible materials such as Polyether
ether ketone (PEEK). Additional materials considered acceptable for
biological implantation are well known and include, but are not
limited to, stainless steel, titanium, tantalum, combination
metallic alloys, various plastics, resins, ceramics, biologically
absorbable materials and the like. In addition, any of the devices
may be packed with a bone graft or other suitable material for
fusing to adjacent bone.
[0028] FIGS. 7 and 8 show another embodiment of a device 705 that
is configured for placement between the spinous processes SP1 and
SP2 of two adjacent vertebral bodies. The device 705 includes two
pairs of arms including a first pair with first and second arms
710a and 710b, as well as a second pair with third and fourth arms
710c and 710d. The arms 710a and 710b in the first pair of arms are
sized and shaped to grasp or otherwise couple to the spinous
process SP1. Likewise, the arms 710c and 710d in the second pair of
arms are sized and shaped to grasp or otherwise couple to the
spinous process SP2. As described in detail below, the relative
positions of the arms can be adjusted by rotating actuator 715.
[0029] Rotation of the actuator 715 causes the arms in a respective
pair to rotate about an axis of rotation of the actuator 715. That
is, the arms rotate about the axis in a scissor-like manner. This
permits the arms to be opened up to a size that would accept a
respective spinous process and then closed to a size that grasps
the respective spinous process. In an embodiment, each arm has a
flat inner surface with projections that are configured to increase
a frictional hold with the spinous process to which the arm is
coupled, as shown in FIGS. 9 and 10.
[0030] FIG. 9 shows a perspective view of the device 705 in an
assembled state and FIG. 10A shows the device 705 in an exploded
state. The device 705 includes a first arm member 905 that includes
a pair of arms. A second arm member 910 includes another pair of
arms. Each arm member includes a central shaft in which a coupler
member 915 and a screw member 920 may be co-axially positioned. The
screw member 920 couples to a cap 925 that is positioned on an
opposite end of the screw member 920 to secure the device 705 in an
assembled state. The coupler member 915 and screw member rotatably
attach to the arm members 905 and 910. When the screw member is
rotated, it causes the arm members 905 and 910 to also rotate such
that the arms may be rotated toward and away from another.
[0031] FIGS. 10B and 11 show another embodiment of the ISP device,
referred to as device 1005. The device 505 includes a pair of
opposed members 1010 that define a space S therebetween. Each of
the members 1005 is sized and shaped to be positioned adjacent or
juxtaposed with a spinous process of a respective vertebra. The
spinous process can be positioned within the space S. In this
regard, each of the members 1010 includes one or more pads 1017
having attachment elements, such as spikes, that are configured to
attach onto the spinous process. The pads are attached to the
members in a ball and socket manner such that the pads are
configured to rotate and pivot about the ball and socket
attachment.
[0032] With reference still to FIGS. 10B and 11, a connector 1020
connects the two members 1010 to one another. The connector 1010 is
an elongated shaft having a first end with a head 1025 that sits in
a seat in one of the members 1010. A second end region of the
connector 1010 extends through a hole in the second member 1010.
The connector 1020 and hole may be threaded such that rotation of
the connector 1010 causes the two members 1010 to move toward or
away from one another depending on the direction of rotation. In
this manner, the spinous process may be secured between the two
members 1010. An outer housing 1030 is positioned around the
connector 1020. The outer housing is sized and shaped to receive
bone material for fusing with the spine.
[0033] In another embodiment, shown in FIG. 12, the device includes
a pair of members 1005 and a connector 1010 therebetween. The
connector is formed of a first connector member 1205 and a second
connector member 1210 that coupled to one another such as in a
male-female relationship. The connector members include a ratchet
interface that permits the two connector members to be pushed
toward one another in an interlocking fashion. The ratchet
interface permits the two members 1005 to be successively moved
toward one another and locked in successively closer positions so
as to vary the size of the space S. The configuration of the
ratchet can be varied to permit various increments of relative
movement between the two members 1005.
[0034] In yet another embodiment, shown in FIG. 13, the device
includes a pair of members 1005 that are monolithically coupled to
one another via a connector 1305 that is monolithically attached to
the two members. A set of pads 1317 are positioned on the members
wherein the pads 1317 include attachment elements such as spikes.
The pads 1317 define a space therebetween that is sized to receive
an interspinous process. The positions of at least some of the pads
can be moveably adjusted to vary the size of the space S between
facing pads.
[0035] Although embodiments of various methods and devices are
described herein in detail with reference to certain versions, it
should be appreciated that other versions, embodiments, methods of
use, and combinations thereof are also possible. Therefore the
spirit and scope of the appended claims should not be limited to
the description of the embodiments contained herein.
* * * * *