Expandable push-in arcuate orthopedic implant

• US 20070032871A1
• Filed: 10/10/2006
• Published: 02/08/2007
• Est. Priority Date: 02/04/2000
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Michelson, Gary
• Granted Patent: US 8,771,358 B2
• Time in Patent Office: Days
• US Class Current: 623/17.110
• CPC Class Codes: A61B 17/8052 immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/446 having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30143 hexagonal
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30261 parallelepipedal
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30362 with possibility of relative movement between the protrusion and the recess
• CPC Class Codes: A61F 2002/30392 Rotation
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30517 : using a locking plate
• CPC Class Codes: A61F 2002/30538 : for adjusting angular orientation
• CPC Class Codes: A61F 2002/30556 : for adjusting thickness
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30616 : Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30624 : Hinged joint, e.g. with transverse axle restricting the movement
• CPC Class Codes: A61F 2002/30632 : with rotation-limiting stops, e.g. projections or recesses
• CPC Class Codes: A61F 2002/30774 : internally-threaded
• CPC Class Codes: A61F 2002/30777 : Oblong apertures
• CPC Class Codes: A61F 2002/30779 : arcuate
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30789 : perpendicular with respect to each other
• CPC Class Codes: A61F 2002/3079 : Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30836 : knurled
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30891 : Plurality of protrusions
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/30975 : made of two halves
• CPC Class Codes: A61F 2002/448 : comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0034 : D-shaped
• CPC Class Codes: A61F 2230/0082 : parallelepipedal
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation
• CPC Class Codes: A61F 2250/0009 : for adjusting thickness
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00071 : Nickel or Ni-based alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00359 : Bone or bony tissue
• CPC Class Codes: A61F 2310/00407 : Coating made of titanium or of Ti-based alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

A push-in interbody orthopedic implant having an expandable height for at least in part insertion at least in part between two adjacent bone masses.

Claims

1. A push-in orthopedic implant for at least in part linear insertion at least in part between two adjacent bone masses, said implant comprising:

an upper member having a portion being at least in part arcuate adapted for placement toward and into contact with one of the adjacent bone masses, said upper member having at least one opening adapted to communicate with one of the adjacent bone masses, said upper member having a proximal end and a distal end;

a lower member having a portion being at least in part arcuate adapted for placement toward and into contact with the other of the adjacent bone masses, said lower member having at least one opening adapted to communicate with the other of the adjacent bone masses, said openings of said upper and lower members being in communication with one another and adapted for permitting for the growth of bone from adjacent bone mass to adjacent bone mass through said implant, said lower member having a proximal end and a distal end corresponding to said proximal end and said distal end of said upper member, respectively, and a length between said proximal and distal ends, said upper and lower members articulating therebetween adjacent one of said proximal ends and said distal ends of said upper and lower members and allowing for expansion of the height of said implant, said upper and lower members having a first position relative to one another allowing for a collapsed implant height and a second position relative to one another allowing for an increased height; and

at least one blocker adapted to cooperatively engage and hold at least a portion of said upper and lower members apart so as to maintain the increased height of said implant and resist the collapse of said implant to the collapsed implant height when said implant is in a final deployed position, said blocker being configured to rotate in a plane generally perpendicular to a longitudinal axis of said implant and to remain in said plane while transitioning said upper and lower members from said first position to said second position.

2. The push-in implant of claim 1, further comprising a hollow defined between said upper and lower members in communication with said openings in each of said upper and lower members, said hollow being adapted to receive fusion-promoting substances.

3. The push-in implant of claim 2, wherein said hollow has a width that is unobstructed by any mechanism for moving said blocker.

4. The push-in implant of claim 1, wherein said implant has a constant width in both the first position and the second position.

5. The push-in implant of claim 1, wherein said implant has side walls and said blocker does not contact said side walls when said implant is in the final deployed position.

6. The push-in implant of claim 1, wherein each of said upper and lower members have a track configured to permit said blocker to seat therein.

7. The push-in implant of claim 1, wherein said blocker moves said upper and lower members from a parallel orientation relative to one another in the first position to one of a parallel and an angled orientation relative to one another in the second position.

8. The push-in implant of claim 1, wherein said blocker has an upper surface, a lower surface, and side surfaces as defined when said blocker is positioned to increase the height of said implant, said side surfaces intersecting said upper and said lower surfaces at two pairs of diametrically opposed junctions.

9. The push-in implant of claim 8, wherein said two pairs of diametrically opposed junctions are a pair of diametrically opposed corners and a pair of diametrically opposed arcs.

10. The push-in implant of claim 9, wherein said two diametrically opposed arcs are each of the same radius.

11. The push-in implant of claim 10, wherein the distance across said two diametrically opposed arcs generally approximates the distance between said upper and lower surfaces of said blocker.

12. The push-in implant of claim 1, wherein said upper and lower members are configured to cooperate with one another so as to stop said upper and lower members from being moved apart from one another more than a predetermined distance.

13. The push-in implant of claim 1, wherein said upper and lower members have a rotational articulation therebetween adjacent one of said proximal end and said distal end of said upper and lower members.

14. The push-in implant of claim 1, wherein said implant has an interior, at least one of said upper and lower members has a screw hole passing therethrough adapted to receive a screw passing from said interior of said implant into one of the adjacent bone masses.

15. The push-in implant of claim 1, further comprising at least a portion of a bone-engaging projection adapted for linear insertion formed on the exterior of each of said upper and lower members for penetrably engaging the adjacent bone masses.

16. The push-in implant of claim 15, wherein said bone-engaging projection is selected from one of a ratchet, a surface roughening, and a knurling.

17. The push-in implant of claim 1, in combination with a bone growth promoting material.

18. The push-in implant of claim 17, wherein said bone growth promoting material is selected from one of bone morphogenetic protein, hydroxyapatite, and genes coding for the production of bone.

19. The push-in implant of claim 1, wherein said distal ends of said upper and lower members are symmetrical from side to side.

20. The push-in implant of claim 1, wherein said at least one blocker has a first height corresponding to the height of said at least one blocker when said implant is initially inserted between the adjacent bone masses, said at least one blocker having a second height corresponding to the height of said at least one blocker when said at least one blocker is rotated into a final deployed position to increase the height of said implant, said second height of said at least one blocker being greater than said first height of said at least one blocker, said first height and said second height being in a plane.