WO2002009626A1 - Improved spinal surgical prosthesis - Google Patents
Improved spinal surgical prosthesis Download PDFInfo
- Publication number
- WO2002009626A1 WO2002009626A1 PCT/US2000/020526 US0020526W WO0209626A1 WO 2002009626 A1 WO2002009626 A1 WO 2002009626A1 US 0020526 W US0020526 W US 0020526W WO 0209626 A1 WO0209626 A1 WO 0209626A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- prosthesis
- set forth
- bearing surface
- surface assemblies
- bio
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/4465—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
-
- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7059—Cortical plates
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- A—HUMAN NECESSITIES
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- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/446—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
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- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/28—Bones
- A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
- A61F2002/30062—(bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
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- A—HUMAN NECESSITIES
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
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- A—HUMAN NECESSITIES
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
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- A—HUMAN NECESSITIES
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
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- A—HUMAN NECESSITIES
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
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- A—HUMAN NECESSITIES
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30599—Special structural features of bone or joint prostheses not otherwise provided for stackable
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- A—HUMAN NECESSITIES
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30601—Special structural features of bone or joint prostheses not otherwise provided for telescopic
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
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Abstract
This invention is a prosthesis in the form of a cage having opposed complimentary bearing surface assemblies (2) (3). The bearing surface assemblies are moveable towards, and away from each other. The moving mechanism (4) (5) is part of the bearing surface assemblies. Each of the bearing surface assemblies have an outer bearing surface whereby movement of one bearing surface assembly in one direction will move the bearing surface assemblies away from each other, and movement in the direction will move the bearing surface assemblies towards each other.
Description
IMPROVED SPINAL SURGICAL PROSTHESIS
This application claims the benefit of U.S. Patent Application No. 09/360,796 filed July 26, 1999.
FIELD OF INVENTION
The present invention relates to an improved spinal surgical prosthesis and more particularly to apparatus and methods for achieving stability of adjacent vertebrae and
preserving the inter-disc space following disectomy by internal fixation or fusion.
BACKGROUND OF THE INVENTION
Fusion commonly performed for adjacent bone structures and those not adjacent
provides for long term replacement as a result of degenerative or deteriorated disorders in bone.
An inter- vertebral disc is a ligamentous cushion disposed between vertebrae and as
a result of injury, disease or other disorders may deteriorate in part or in whole, thereby
leading to mechanical instability and painful disc translocations and often necessitating
bed rest or hospitalization. If left untreated possible subsequent involvement of adjacent
nerves and muscular involvement may occur. In such cases, if treatment is delayed, permanent damage to the nerves may result in muscular atrophy and severe dysfunction.
Procedures for disc surgery may involve partial or total excision of the injured disc
portion and replacement with biocompatible devices of bone or bone-like material.
EARLY TECHNIQUES
Bone material was simply disposed between the adjacent vertebrae, typically at the posterior aspect of the vertebrae and the spinal column was stabilized by way of. a plate or rod comiecting the involved vertebrae. However, the use of bone may require undesired additional surgery and is of limited availability in its most useful form. In addition, the risk of infection and rejection is a significant consequence. In any event, bone is only marginally structural and with bone it is difficult to stabilize both the implant against dislodgment and stabilize the adjacent vertebrae. It becomes desirable to find solutions for
stabilization of an excised disc space by fusing the vertebrae between their respective end
plates without the need for anterior or posterior plating or rods.
PRIOR ART
A review of the prior art clearly reveals attempts to achieve such solutions in two
distinct areas, namely:
I. Static inter-body fusion devices
II. Adjustable inter-body fusion devices that can restore and stabilize
varying heights of the intra-discal space.
I. Static Inter-Body Fusion Devices
An extensive number of static inter-body fusion devices commonly called "cages"
have evolved for replacement of a damaged disc while still maintaining stability of the disc
inter-space between the adjacent vertebrae.
However, existing static inter-body fusion devices encountered some problems.
They require drilling, boring or tapping of the end plates which sometimes results in
removal of an excessive amount of supporting bone with possible damage to adjacent
structures. Moreover, threads of the implant or cage may inadvertently engage the
prepared threads of the vertebrae in an improper manner so as to cause a misalignment of the vertebrae in an anterior-posterior direction as well as laterally. If a second cage is
needed, it involves the drilling, boring or tapping of the vertebral end plates for both cages
so that the threads direct the cages into their proper respective positions. Such preparation
requires highly skilled precision that may not be afforded or attainable under normal
working conditions.
When a second cage is inserted, due to the unevenness of the vertebral end plates
concave engaging surfaces, an unwanted increase in the inter- vertebral space may result in
the loosening and possible dislodgment of the initially placed implant cage.
The anatomical configurations of the vertebrae necessitates that the two cages be
positioned at an angle in respect to each other so as to be totally within the confines of the
lateral borders of the vertebrae involved.
Use of tapered cages that are dimensionally greater in height anteriorally than
posteriorally so as to provide the proper lordosis when such cage implants are employed
creates complications. When the posterior approach is utilized and drilling, boring or
tapping is necessary for placing threads on the vertebral end plates, difficulties exist in
creating threads that will have a pitch compatible with those exhibited by the threads of
such cages. A further complication is present when utilizing tapered cages via the
posterior approach in that the dimensionally higher anterior threaded portion of the tapered
cage is initially inserted and advanced to its most anterior final resting position. These
cages are self-tapping to some degree and may result in the unwanted excessive removal of
bone from the posterior portion of the lumbar segments where the lordosis is greatest.
Drilling and other types of preparation of the vertebral end plates may result in the removal of excessive amounts of supporting bone, and may cause the cage implants to rest upon the cancellous portion of the vertebrae. In such instances the cages may settle into
said vertebrae resulting in a decreased inter- vertebral space other than that desired with
subsequent complications of stabilization, pain and discomfort.
II. Adjustable Inter-Body Fusion Devices
These are designed for restoring and maintaining the inter-vertebral space thereby
providing for the normal contour of the fused spinal segments. Once the disc is removed,
the normal lordotic or kyphotic curvature is eliminated and adjustable inter-body fusion
implants are employed for re-establishing the proper curvature and stabilization of the
spine.
Adjustable inter-body fusion devices have universal applicability and may
eliminate the need for surgical preparation of the vertebral end plates such as contouring of
bone and drilling, boring and tapping of said vertebral end plates. Such devices restore
and preserve the inter-space and the integrity of the adjacent vertebrae thereby making the
selection of the proper implant easier. They result in preservation of the highly specialized
weight bearing cortical bone thereby preventing end plate perforation into the highly
vascular cancellous bone marrow and unwanted subsequent bleeding may result in many
complications due to excessive blood loss risks (e.g. hypoglycemic shock, transfusion, and
possible diseases such as hepatitis and Acquired Immune Deficiency Syndrome, etc.),.
Another advantage of such devices is the elimination of incorrect implant size selection as
no significant amount of bone is removed and the correct size implants are easily fitted to
restore the proper inter-space. In addition, the implant is self-stabilizing without the use of
threads and may be further enhanced by surface treating of the implant for bone in-growth and osseous integration of the implant.
DESCRIPTION OF THE RELATED ART
The following patents disclose Static Inter-Body Fusion Devices: 5,785,710;
5,782,919; 5,766,253; 5,609,636; 5,425,772; 4,878,915; 4,501,269; 4,961,240 and
5,055,104.
The following patents disclose Adjustable Inter-Body Fusion devices: 5,782,832;
5,766,199; 5,702,455; 5,609,635; 5,336,223; 5,306,310.
ADVANTAGES OF INVENTION
The present invention overcomes the disadvantages represented by the prior art by
not requiring drilling procedures for threaded engagement of adjacent vertebrae and
subsequent end plate preservation. It restores and preserves the disc inter- vertebral space
with the proper curvature of the spine. As taught by this invention, the methods and
devices for insertion following disc removal requires no specialized surgical technique and
allows for precise placement of the device and subsequent re-establishment of the proper
inter- vertebral space and lordosis by either an anterior or posterior surgical approach.
Further, this invention permits precise implant size to fit within the space allowed and not
endanger or damage adjacent structures. Hence, incorrect implant size selection and the
need for a variety of implant sizes is eliminated. An added advantage is, if removal is
necessary it would not result in iatrogenic destruction of the adjacent vertebrae. Also,
spinal stability is obtained without the use of threads since such threads may adversely
affect the vertebrae themselves.
SUMMARY OF INVENTION
The present invention is an inter-space implant utilized to replace a damaged disc. The present invention is clearly an improvement over the prior art providing an implant
prosthesis intrinsically participating in this fusion process, self-stabilizing to the spinal
segments, consistent with conventional methods of disectomy and uniquely and novel
consistent with the preservation of the integrity of the adjacent vertebrae.
The present invention comprises an artificial implant for the purpose of which is to
aid in and directly cause bone fusion across an inter-vertebral space following the removal
of a damaged disc. Said prostheses are biocompatible, structurally load bearing devices,
stronger than bone, capable of withstanding the forces generated within the spinal inter¬
space. They have a plurality of openings of specific size which can be filled with fusion
promoting material by inducing bone growth and osseous integration with the adjacent
vertebrae forming a bony bond to the implants and each other. The implant bone-
contacting surface may be textured, designed or otherwise treated by any known
technologies to achieve bone in-growth and fusion to the implants to enhance stability of
the implant and to expedite the fusion. The improved devices are configured and designed
so as to promote their own stability within the vertebral inter-space to resist dislodgment
and stabilize the adjacent vertebrae.
The present implant is made of a biocompatible material and has means if desired
for increasing osseous integration, controlling hemostasis and preventing infection. It
establishes proper spinal curvature or lordosis and kyphosis and capable of reducing a
vertebral listness (a forward or backward translation of one vertebrae upon another as well
as lateral misalignment of said vertebrae). It gives increased safety and precision which
provides complete and easy visualization of the structures involved and adjacent vital
structures (e.g. organs, neural structures and blood vessels and related bony surfaces). It
also eliminates the need for a second surgical procedure to harvest bone. It also provides the method and material that is resorbable for additional means of stabilization to be used
in conjunction with the implant prosthesis for certain conditions that require additional
stabilization for osseous integration. It may be used in distraction osteogenesis procedures
in order to increase bone length and/or for inducing bone growth and osseous integration
of the implant, and for controlling hemostasis and pain and preventing infection during
and following the surgical procedure allowing for an increased opportunity of success.
PROCEDURE FOR IMPLANT
A conventional disectomy is performed and the vertebral end plates are roughened
in preparation for use of the implant prosthesis of the present invention.
In an anterior cervical device implantation a short transverse incision is made
across the front of the neck and off-center, preferably to the right of the midline and
directly over the diseased or otherwise disc being replaced. The platysma muscle is
dissected and split and the sternocleido-mastoid muscle with the carotid sheath is protected
and retracted laterally. The esophagus, trachea and associated midline structures are
protected and retracted medially, thus exposing the anterior aspect of the cervical spine.
The disc involved is identified and removed by l nown, acceptable and conventional
surgical methods. The adjacent vertebral end plates are gently scraped free of any
remaining cartilage until diffuse fine punctuate decortication is achieved. The dimensions
of the inter-space are then measured in mild distraction and compared with the stereo-
tactic pre-surgical x-ray diagnostic procedures and video imaging devices which helps to
determine the exact intra-discal space to be restored relative to the vertebrae involved and the undamaged disc space that exists inferiorly and superiorly to the vertebrae involved.
The appropriate device or devices are selected for insertion with a specially designed
device that establish the necessary space for insertion behind the anterior lips of the
vertebrae. The device is activated for establishing the desired inter-vertebral space and
said device is locked at the desired height. Alternatively, the prosthesis may be a single,
double or multiple activated device so as to properly provide stability and the proper
curvature or lordosis of the spine. Harvested bone or bone fill material commonly
employed is packed into and around the implant. Alternatively a new bone fill material is
provided that is a polymer capable of being polymerized into a desired shape and size via
being a resorbable biocompatible photo-initiated polymer and cured via visible light. In
certain situations of trauma and disease additional stabilization is required and a resorbable
biocompatible photo-initiated polymer rod or plate and screws may be utilized and to be
attached to the vertebrae involved as well as healthy vertebrae above and below the
damaged site. Guide plates are provided for drilling holes to affix the plate and or rod to
the vertebrae with the necessary screws. In extreme cases the additional stabilization may
employ currently available rigid devices for such purposes. All areas are inspected and the
wound is then closed in the routine manner. A further biocompatible resorbable photo-
initiated polymer is provided to control hemostasis as well as controlling post-operative
pain or infection. The devices may also be used in other areas of the spine, such as the
thoracic and lumbar regions, utilizing both the anterior or posterior surgical approaches as
selected by the surgeon.
OBJECTS OF THE INVENTION
It is the object of the present invention to provide for a means of achieving fusion
of the inter- vertebral space and stabilization as a single procedure by a means consistent
with the conventional method of disectomy and re-establishing the ideal and normal preexisting disc inter-space.
It is another object of the present invention to provide for a means of achieving an
inter-space fusion and stabilization that is easier, quicker, safer and entails less blood loss
than other known means.
It is another object of the present invention to provide for a means of achieving a
one stage inter-space fusion and stabilization with minimal damage and less removal of
bone from the surface of the adjacent vertebrae than other known means.
It is another object of the present invention to provide for a method and device for
inter- vertebral arthrodesis and stabilization and establishing the normal and pre-exiting
inter- vertebral space in an easy, quick, safe and precise manner and in addition the entire
procedure is performed under direct vision and may be further guided by optical imaging
computerized devices.
It is another object of the present invention to provide for a method and device of
inter- vertebral arthrodesis and stabilization that allows for the inter- vertebral space to be
adjusted and of variable sizes unlike any other lαiown means and with greater simplicity
and accuracy than any other lcnown means.
It is another object of the present invention to provide for a modular prosthesis
having similar and multiple attachments that allows for insertion through a small opening
and then to reconstitute an inter-space occupying device much larger than would be
normally inserted.
It is another object of the present invention to provide for a method and device that precisely fits the contours of any inter-space without the need to sacrifice any vertebral bone to accommodate the prosthesis and can be inserted from an anterior or posterior surgical approach if desired.
It is another object of the present invention to provide for an implant that has
means for osseous integration with the adjacent vertebrae and said device having
additional means to act as a shock absorber when extremely heavy forces are exerted upon said device.
It is another object of the present invention to provide for a method and device that
reestablishes the normal lordosis of the spine in a simple and precise manner.
It is another object of the present invention to provide a method and biocompatible
material for inducing bone growth that is easier to use than any other known materials for
this purpose and can readily be shaped into a desired form and resist dislodgment. This
material may also act over a prolonged period of time by being time released for this purpose.
It is another object of the present invention to provide a biocompatible material and
method for use in controlling hemostasis thereby enhancing the opportunity of success for
osseous integration in individuals with abnormal clotting times. The hemostatic agent may
also act over a prolonged period of time to further control post- operative bleeding,
especially in individuals with poor clotting times, by being time released for this purpose.
It is another object of the present invention to provide a material and method for
controlling post-operative pain following the surgical procedure, and said material may be time released locally over a period of time for this purpose.
It is another object of the present invention to provide a material and method for preventing and controlling infection following the surgical procedure and said material may be time released locally and/or in combination with systemic drugs for this purpose.
It is another object of the present invention to provide a material and method for use of time released anti-tumor drugs or radiation seeds that may control or eradicate tumors related to the area of uses of said invention.
It is another object of the present invention to provide a method and device for use
in distraction osteogenesis procedures unlike any other known devices and method
currently employed.
These and other objects of the present invention will be apparent from review of
the following documentation and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Although the invention has been described with regard to the preferred
embodiments, it is recognized that other embodiments of the present invention may be
devised which would not depart from the scope of the present invention.
Fig. 1 is an exploded perspective view showing a prosthesis made in accordance
with the present invention.
Fig. 2 is a cross-sectional view of the prosthesis, with a spring biasing the top and bottom sections.
Fig. 3 is a highly simplified side view showing the prosthesis in place between
vertebrae.
Fig. 4 is a rear view of the prosthesis as shown in Fig. 3.
Fig. 5 is an exploded perspective view showing a modification of the prosthesis of the present invention.
Fig. 6 is an exploded perspective view showing another modification of the present invention for vertebrae replacement. Fig. 7 shows another modification of the present invention for aligning the vertebrae.
Fig. 8 is a perspective view of a part of the prosthesis shown in Fig. 7 with an
extremely magnified detail of a portion thereof.
Fig. 9 is a perspective view showing another modification of the present invention
for multi-directional leveling of the vertebrae.
Figs. 10A through IOC are several views of another embodiment of the present
invention as a flexible prosthesis partially made of a bio-resorbable material.
Figs. 11A through 1 ID are several views of another embodiment of the present
invention for two level stabilization of the vertebrae.
Figs. 12A through 121 are several views of another modification of the present
invention.
Figs. 13A through 13D are several views of another modification of the present invention.
Figs. 14A through 14C are several views showing another modification of the
present invention.
Fig. 15A through 15C are several views showing another modification of the
present invention.
Figs. 16A through 16C are several views showing another modification of the
present invention.
Figs. 17A through 17C are several views showing another modification of the
present invention.
Figs. 18A through 18F are several views showing another modification of the present invention. Fig. 19 shows still another modification of the present invention.
Figs. 20A through 20F are several views showing still another modification of the present invention.
DESCRIPTION
In general the present invention provides two identical interlocking disc shaped parts that have an elevated, spiraling steps-like surface around the perimeter and inner
walls that provide an axis and bearing surface for rotation/interlocking. When these discs
are rotated toward or away from each other the discs will increase or decrease the distance
between them at 10 degrees rotation by a predetermined amount. In effect, this changes
the rotational motion of the discs with a linear motion.
Referring to the drawings, and particularly to the embodiment of the invention
shown in Figs. 1 and 4, the prosthesis or implant of the present invention comprises a cage
1 having a pair of upper and lower sections 2 and 3 which are identical to and
complimentary to each other and are adapted to interfit and rotate relative to each other.
The upper section 2 has a top bearing surface 4 and the lower section 3 has a bottom
bearing surface 5 which is substantially identical to the top bearing surface 4. The bearing
surfaces 4 and 5 are shown as being circular and have circular side-walls 6 and 7,
respectively, extending at right angles from each. The top and bottom bearing surfaces 4
and 5 have a central opening 8 and 9, respectively, and the side walls 6 and 7 have a
plurality of openings 10 therein. Circular ridges 11 are provided on the top and bottom bearing surfaces 4 and 5, each of which are concentrically located with respect to the central openings 8 and 9. Radiating outwardly from each central opening 8 and 9 are channels 12. A plurality of openings 13 are preferably provided in the top and bottom
bearing surfaces 4 and 5. Bearing surfaces 4 and 5 are not limited to being circular in
shape as shown and can be oval or having the shape of the vertebrae endplates or other shapes. Similarly, ridges 11 are not limited to being concentrically circular as shown and
other shapes or non-uniformly aligned ridges may be used.
Spaced inwardly from the side walls 6 of each of the two sections 2 and 3 are a pair
of opposed curved outer guide partitions 20 and 21 , each of which is substantially equally
spaced from the central openings 8 and 9 and equally spaced from their respective side
walls 6 and 7. Each of the top and bottom sections 2 and 3 have an inner curved guide
partition 22 inwardly spaced from one of the outer partitions 20 and 21. The top and
bottom sections 2 and 3 are adapted to be assembled together so that the partition 21 of
one section will fit between the partitions 20 and 22 of the other section, as more clearly
shown in Fig. 2. This will permit the two sections 2 and 3 to rotate relative to each other
while remaining in axial alignment with each other. Furthermore, the partitions 20, 21 and
22 limit the degree of rotation when partitions 20, 21 or 22 of the top section 2 is rotated
until it comes in contact with the corresponding partitions 20, 22 or 21, respectively, of bottom section 3. A spring 41 is inserted in and extends between the openings 8 and 9 in
order to hold the two section 2 and 3 together and biased towards each other. Other means
of biasing, for example, elastic string or post can be used.
The side walls 6 and 7 of each section 2 and 3 are arranged in a plurality of
inclined cam surfaces 25 which extend substantially from the bearing surfaces 4 and 5 of
each and incline away from the bearing surfaces 4 and 5. In the embodiment shown in Figs. 1 through 4, three identical cam surfaces 25 are shown on each section 2 and 3. However, it will be understood that the number of cam surfaces 25 may be increased or
decreased if desired. The cam surfaces 25 of each section 2 and 3 are complimentary to
each other. In the drawings, the edge of each cam surface 25 has a plurality of teeth 26. The teeth 26 and the cam surfaces 25 of each top and bottom section 2 and 3 are the same
so that the teeth 26 of each will interfit with each other when the two sections 2 and 3 are
assembled together. Preferably, the apexes of the teeth 26 are rounded with a radius of
0.005 inch as shown in Fig. 8. However, different radii can be used. The sections 2 and 3
are adjusted to the desired height by rotating one section relative to the other. The cam
surfaces 25 will move the sections 2 and 3 away from each other or toward each other and
the teeth 26 in both sections will interfit with each other to prevent rotary displacement
and to hold the sections 2 and 3 at the desired height. The openings 10 on the side walls 6
and 7 may be used to rotate one section relative to the other section by inserting a tool (not
shown) therein and rotating one section relative to the other section.
The two sections 2 and 3 of the cage 1 are assembled together and inserted between
vertebrae 30, 31 as shown in Figs. 3 and 4. Prior to insertion between vertebrae 30 and 31,
various agents to promote osseous integration, control post-operative bleeding, pain,
infection or control or eradicate tumors may be placed between the two sections 2 and 3.
These agents may be incorporated in a substance called De-Mineralized Bone Matrix
available from Grafton Inc., which is putty-like in an uncured state for ease of placement
within the two sections 2 and 3 and becomes not pliable upon curing. The substance containing the various agents may be photocurable polymers, by either ultraviolet light in the range of 350-385 nanometers in wavelength or visible light in the range of 385-550
nanometers in wavelength. Furthermore, the substance may also be colored in the uncured state and turn clear upon curing to aid in assuring visually that the polymer has been
completely cured, such as photo-initiator HU-470 available from Spectra Inc.
The vertebrae 30 and 31 and the space between them have been prepared (by cleaning and otherwise) to receive the cage 1 as described hereinabove. After the cage 1 is inserted between the two vertebrae 30 and 31, the two sections 2 and 3 are rotated relative
to each other until their bearing surfaces 4 and 5 make the proper contact with the opposed
bearing surfaces of the vertebrae 30 and 31 in order to support the vertebrae. The ridges
11 on the bearing surfaces 4 and 5 permit the two sections to be easily rotated on the
vertebrae and permit positive contact with the vertebrae. The channels 12 act as a
reservoir for cartilage and other bone material to enter as the bearing surfaces 4 and 5
grasp and become enmeshed with the two sections 2 and 3 thereby fusing the cage 1
between adjacent vertebrae 30 and 31. Channels 12 may also be coated with a bone initiating or stimulating material to further promote osseous integration.
Referring now to the embodiment shown Fig. 5, the two sections 2A and 3A of the
cage 1A are similar to the sections 2 and 3 of cage 1 described in the embodiment of Figs.
1 through 4. However, in this instance, four cam surfaces 25A are shown.
In the embodiment shown in Fig. 6, the top and bottom sections 2B and 3B of cage
IB are similar to the sections 2 and 3 discussed above. However, an elongated connecting
tube 44 is interposed between them. The top and bottom end edges of the connecting tube
44 has cam surfaces 46, teeth 47, partitions 48 and 49 and openings 45 and are similar to
the cam surfaces 25, teeth 26, partitions 20 and 22 and openings 10 in the sections 2 and 3
of the Figs. 1 through 4 embodiment. Hence, the sections 2B and 3B are complimentary to
the end edges of the tube 44. With this structure, if the space between the vertebrae is very
large, the connecting tube 44 is used in order to span the distance between the two sections
2B and 3B to fill the space between the vertebrae. Alternatively, the structure shown in Fig. 6 may be used to replace a vertebrae.
Referring to the embodiment shown in Figs. 7 through 8 the prosthesis shown comprises double cages 50 and 51 which has top sections 2C similar to the top section 2 of
the Figs. 1 through 4 embodiment. The bottom sections 3C are also the same but are
connected together by a web 52. The top sections 2C are rotated relative to the bottom
sections 3C. The cages 50 and 51 can be adjusted to different heights depending on the
spinal curvature that is desired. Adjusting the cages to different heights will cause the
cages to act as a leveling device.
The embodiment shown in Fig. 9 shows a prosthesis that is similar to the
embodiment shown in Figs. 7 through 8. However, in this embodiment, three cages 60, 61
and 62 are used with the top sections 2D of each (only one is shown) being the same as the
top section 2 of the Figs. 1 through 4 embodiment and the bottom sections 3D being
connected together by a web 63. Again, the cages 60, 61 and 62 can be individually
adjusted to different heights to act as a leveling device that allows multi-directional flexibility without sacrificing stability and restores natural mobility of the vertebrae.
Figs. 10A through 10C show another embodiment of the present invention. A cage
53 is similar to the cage described in connection to Fig. 1. However, the outer edge 54 of
the cam surfaces 25 and the teeth 26 are made of a bio-resorbable material. A titanium
bellows 55 surrounds the cage 53. The bio-resorbable material between the upper and
lower sections of cage 53 will degrade eventually and leaving the bellows 55 to give the cage multi-directional flexibility without causing associated instability.
Figs. 11 A through 1 ID show another embodiment of the present invention. In this embodiment, an upper vertebrae, 30, a lower vertebrae 31, and an intermediate vertebrae
32, are to be linked together. A cage 34 similar to the cage described in connection with Fig. 1, is inserted between the upper vertebrae 30 and the intermediate vertebrae 32, and
another similar cage 34 is inserted between the lower vertebrae 31 and the intermediate vertebrae 30. A connecting and stabilizing assembly 35 is provided to connect the two
cages 34 and to comiect and stabilize all the vertebrae 30, 31 and 32. The connecting
assembly 35 comprises a clamping plate 36 having a plurality of threaded openings 37
therein. The clamping plate 36 is to be screwed or otherwise mounted to the central
vertebrae 32 by a screw or some other suitable means 40. Connecting rods 38 are
threadably inserted through the openings 37 in the clamping plate 36. The outer ends of
the connecting rods 38 have holding knobs 39 which bear against the outer surfaces of
each cage 34 on each side thereof as shown in Fig. 1 IB. With this structure the clamping
plate 31 is affixed to the intermediate vertebrae 32 and the holding knobs 39 of each
connecting rod 38 extends along both sides of each of the cages 34 and stabilizes the cages
and the vertebrae 30, 31 and 32.
Referring now to the embodiment in Figs. 12A to 121, a gear type expansion cage
70 is shown. The expansion cage 70 comprises a pair of curved elongated outer bearing
surfaces 71 each of which have a geared threaded opening 72 therein. A gear wheel 73 has
threaded extensions 74 on each side thereof which are inserted in the threaded openings 72
in each of the curved bearing surfaces 71. A pair of such gears 73 with threaded
extensions 74 is mounted on each end of the bearing surfaces 71 and the two gears 73 are
connected together by a central gear 75. When one of the gears 73 is rotated, that end of
the bearing surface 71 will expand or contract depending on the direction that the gear 73
is turned and at the same time, the central gear wheel 75 will also rotate the second gear 73 in order to expand that side of the curved bearing surface 71. In this manner, the curved bearing surfaces 71 will move away or toward each other to fill the gap between the
vertebrae. The outer surfaces of the bearing surfaces 71 have grooves 76 to permit and enhance fusing the prosthesis with bone.
Referring now to the embodiment shown in Fig. 13A through 13D, a jack-type cage 80 is shown. A pair of opposed bearing surfaces 81 (shown elongated and flat — but
which may be curved) are connected together by a plurality of cross arms 82 through the
intermediation of a jack screw 83. The ends of the arms 82 are comiected to each end of
the two bearing surfaces 81 and to each end of the jack screw 83. Rotating the jack-screw
83 in one direction or the other extends or contracts the arms 82 in either one direction or
the other to either move the bearing surfaces 81 away from each other or to move them
toward each other. In this manner, the bearing surfaces 81 will fill the gap between
vertebrae. In the embodiment shown in Figs. 14A through 14C, a wedge type cage 90 is
described. The curved elongated outer bearing surfaces 91 have a pair of wedges 92
therebetween which are controlled and connected together by a screw 93. The wedges 92
are adapted to move in grooves 94 in the inner channels 95 in the bearing surfaces 91. The
wedges 92 having opposed inclined surfaces 96. By rotating the screw 93 in one direction
or the other the wedges 92 are moved closer or further apart from each other and since the
surfaces 96 are angled in opposite directions, the two bearing surfaces 91 are moved
towards or away from each other. In this manner, the space between the vertebrae may be
filled by merely adjusting the height of the two bearing surfaces 91, as described above.
Figs. 15 A through 15C show a cam type expandable cage. In this embodiment, the opposed curved elongated bearing surfaces 110 have a rod 111 interposed between them
with cams 112 in each end. The rod 111 has an opening 113 at its edges which permit the
rod 111 and the cams 112 to be rotated. When the rod 111 is rotated, the cams 112 will rotate and strike the interior of the two bearing surfaces 110 to move the two bearing
surfaces 110 towards or away from each other. A pair of elongated guides 114 extend
from the interior of one of the bearing surfaces 110, which correspond to a pair of grooves
115 on the interior of the opposite bearing surface 110, to prevent lateral movement and
dislodgment of the opposed bearing surfaces 110 from each other.
Referring to the embodiment of Fig. 16, a flexible spinal fusion prosthesis is shown
in which upper and lower plate members 100 and 101 are provided with an intermediate
convex flexible disc 102 interposed therebetween. The disk 102 may be made of titanium
or some other known material which is biocompatible and compressible. A rigid collar
103 of resorbable material surrounds the disc 102 to make the flexible disc 102 rigid in
order to allow integration of the upper and lower plate members 100 and 101 with the
bones of the vertebrae. The collar 103 will be resorbed and thereafter the flexible disc 102
will function in a flexible manner between the vertebrae.
With respect to the embodiment shown in Fig. 17A to 17C, a pair of expandable
cages 120 and 121 similar to the cages of Figs. 1 and 2 are mounted between vertebrae in a
spaced relationship to each other. A titanium bellows-like assembly 122 is interposed
between the spaced cages 120 and 121. Resorbable rigid material 123. surrounds the bellows 122 and make the bellows 122 rigid until the resorbable rigid material 123 is
absorbed, after which the bellows 122 will become flexible to act as a cushion between the
two cages 120 and 121. If desired the space between the bellows 122 may be filled with a polymer.
In the embodiment shown in Figs. 18A to 18G, a plurality of expandable cages 130 similar to the cage 1 of Figs. 1 through 4, are interposed between a pair of curved elongated bearing surfaces 131 so that contact with the vertebrae is made by the curved
bearing surfaces 131 rather than by the expansion cages 130 themselves. The internal
expansion cages 130 can be adjusted to different heights to permit the bearing surfaces 131 to achieve different heights and angles.
In the embodiment shown in Fig 19 the elongated curved bearing surfaces 140 have
a pair of cages 142 similar to the cage shown in Fig. 1. Each cage has an outer gear 141
extending from its outer surface. When the gears 141 are rotated in one direction, the
bearing surfaces 140 are moved towards each other.
It will be noted that in Fig. 19 the two gears are the same size and ratio. However,
it is within the purview of the present invention for the two gears to be of different ratios
and sizes so that movement of one gear will expand its cage to a certain height, and the
other cage, having a gear of a different ratio, will expand its cage to a different height.
This may also be accomplished by a connecting gear between the two gears (not shown).
It is also possible to accomplish the same purpose by having geared teeth of different
heights so that the two geared cages may move to different expansions. Referring to the embodiment shown in Figs. 20A through 20F, a tapered
expandable cage 150 is shown. An expansion screw 151 is mounted in the cage 150
having a circular solid front portion 152 and expandable curved rear bearing surfaces 153.
By rotating the screw 151, the inner edge of the screw 151 will contact the expandable
bearing surfaces 153 and expand them. In version A (Fig. 20 E), the expandable screw
151 has a point 154 which moves toward the expandable bearing surfaces 153 and spreads them apart. In version B (Fig. 20F), the expansion screw 151 has a tapered blunt edge 155 which contacts the expandable bearing surfaces 153 and spreads them apart.
It will thus be seen that the present invention provides improved means for
achieving fusion of the inter- vertebral space and stabilization as a single procedure in a
manner consistent with the conventional methods of disectomy and re-establishing the ideal and normal pre-existing disc inter-space which is easier, quicker, safer, and entails
less blood loss than other known means. The present invention also achieves one stage
inter-space fusion and stabilization with minimal damage and less removal of bone from
the surface of the adjacent vertebrae and establishes the normal and pre-existing inter-
vertebral space in an easy, quick, safe and precise manner. In addition, the present
invention provides a method and device of inter- vertebral arthrodesis and stabilization that
allows for the inter- vertebral space to be adjustable and of variable sizes and with greater
simplicity and accuracy than any other known means by the use of a modular prosthesis having similar and multiple attachments that allows for insertion through a small incision
and to reconstitute the inter-space occupying device into a much larger spacing member so
as to fit the contours of any inter-space without the need to sacrifice any vertebral bone.
The prosthesis of the present invention provides for an implant that has means for osseous
integration with the adjacent vertebrae which can also act as a shock absorber when
extremely heavy forces are exerted upon it and which permits the reestablishment of
normal lordosis of the spine in a simple and precise manner and provides a method and
biocompatible material for inducing bone growth that can readily be shaped into a desired
form.
The present invention also provides a biocompatible material and method for controlling hemostasis thereby enhancing osseous integration in individuals with abnormal clotting problems and may also act over a prolonged period of time to control post¬
operative bleeding. With this invention, post-operative pain and infection are controlled
and application of anti-tumor drugs or radiation beads may be easily administered by being time released locally and/or in combination with systemic drugs for this purpose.
As many varied modifications of the subject matter of this invention will become
apparent to those skilled in the art from the detailed description given hereinabove, it will
be understood that the present invention is limited only as provided in the claims appended
hereto.
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A prosthesis comprising at least one set of opposed complimentary bearing surface assemblies, means for moving said bearing surface assemblies towards and away from each other, said moving means being integral of the bearing surface assemblies, each of said bearing surface assemblies having an outer bearing surface whereby movement by
the moving means in one direction will move the bearing surface assemblies away from
each other and movement by moving means in the opposite direction will move the
bearing surface assemblies towards each other, thereby increasing and decreasing,
respectively, the height of said prosthesis.
2. The prosthesis as set forth in Claim 1 wherein each of said opposed bearing
surface assemblies comprise top and bottom sections, each section having an outer bearing surface with an inner face and a wall extending therefrom, said wall comprising at least
one inclined cam surface extending substantially vertically from the inner face of said
bearing surface and away therefrom.
3. The prosthesis as set forth in Claim 2 wherein partition means are provided
on each section, said partition means extending substantially vertically and away from the
inner face of said bearing surface. •
4. The prosthesis as set forth in Claim 3 wherein said wall comprises a
plurality of inclined cam surfaces.
Claims
5. The prosthesis as set forth in Claim 4 wherein said partition means of each
of said sections comprises a pair of outer partitions and an inner partition, wherein said outer partitions of said top section engage said inner partition of said bottom section and said outer partitions of said bottom section engage said inner partition of said top section
to allow movement of said top section relative to said bottom section.
6. The prosthesis as set forth in Claim 5 wherein each of said cam surfaces
having an edge, teeth are provided at said edge of said cam surfaces.
7. The prosthesis as set forth in Claim 6 wherein openings are provided in
each of said wall to facilitate movement of said top section relative to said bottom section.
8. The prosthesis as set forth in Claim 6 wherein an opening is provided in the
center of each of said outer bearing surfaces.
9. The prosthesis as set forth in Claim 6 wherein ridges are provided on the
outer bearing surfaces of each of said bearing surface assemblies.
10. The prosthesis as set forth in Claim 6 wherein channels are provided on the
outer bearing surfaces of each of said bearing surface assemblies, said channels radiating
outwardly from the center of said outer bearing surfaces.
11. The prosthesis as set forth in Claim 6 wherein means are mounted between said top and bottom sections in order to bias said top and bottom sections toward each other.
12. The prosthesis as set forth in Claim 11 in which said biasing means are spring means.
13. The prosthesis as set forth in Claim 6 in which all the outer bearing surfaces
of said bearing surface assemblies are supported.
14. The prosthesis as set forth in Claim 13 in which said teeth of said top
section corresponds with said teeth of said bottom section such that said teeth from said
top and bottom sections are contained within said prosthesis.
15. The prosthesis as set forth in Claim 6 in which said wall and said cam
surfaces are curved.
16. The prosthesis as set forth in Claim 6 in which said teeth having rounded edges.
17. The prosthesis as set forth in Claim 6 in which a plurality of openings are
provided on said outer bearing surfaces.
18. The prosthesis as set forth in Claim 6 wherein said opposed bearing surface assemblies has bio-resorbable material between said edges of said cam surfaces and a
bellows surrounds said bearing surface assemblies.
19. The prosthesis as set forth in Claim 6 wherein connecting means is interposed between said two sections and each end of said connecting means having
inclined cam surfaces, teeth on its edges, and inner and outer partitions thereof whereby
the connecting means may be rotated relative to the two sections.
20. The prosthesis as set forth in Claim 6 comprising two or more sets of
opposed complimentary bearing surface assemblies, wherein said bottom sections of said
two or more sets are joined together by a web and each of said set of bearing surface
assemblies being individually and independently adjustable to act as a leveling device.
21. The prosthesis as set forth in Claim 1 wherein said outer bearing surfaces
are curved and wherein said moving means is between said curved outer bearing surfaces.
22. The prosthesis as set forth in Claim 20 wherein gear means are mounted
between the curved outer bearing surfaces.
23. The prosthesis as set forth in Claim 22 wherein said gear means have threaded extensions adapted to be threadably mounted in threaded openings in the curved
outer bearing surfaces.
24. The prosthesis as set forth in Claim 23 in which a pair of gear means are
mounted between the outer bearing surfaces, said gear means mutually movable relative to each other.
25. The prosthesis as set forth in Claim 1 wherein between said bearing surface
assemblies is a substance that promotes osseous integration and bone in-growth.
26. The prosthesis as set forth in Claim 1 wherein between said bearing surface
assemblies is a substance with hemostatic factors to control bleeding.
27, The prosthesis as set forth in Claim 1 wherein between said bearing surface
assemblies is a substance with anti-viral drugs to control and prevent infection.
28. The prosthesis as set forth in Claim 1 wherein said bearing surface
assemblies are connected together by cross-arms and have a jack-screw interposed
therebetween, one end of each arm being mounted on a bearing surface and the other end of said arm being mounted on the jack screw.
29. The prosthesis as set forth in Claim 1 wherein wedge means are interposed
between said bearing surface assemblies, said wedge means being connected together by a
screw and said wedge means movable, in a groove in each of said bearing surface
assemblies.
30. The prosthesis as set forth in Claim 29 in which said wedge means comprise a pair of opposed wedge blocks threadably mounted for movement on the screw and having opposed inclined wedge surfaces.
31. The prosthesis as set forth in Claim 1 further comprises a resilient disc
between said bearing surface assemblies and a bio-degradable band around said disc.
32. The prosthesis as set forth in Claim 2 further comprises a resilient disc
between the outer bearing surface of said top section of one set of bearing surface
assembly and the outer bearing surface of said bottom section of another set of bearing
surface assembly.
33. The prosthesis as set forth in Claim 1 wherein cam surfaces are mounted
between said bearing surface assemblies, said cam surfaces being mounted on a cam
screw.
34. The prosthesis as set forth in Claim 20 further comprises a curved outer
bearing surface extension attached to said outer bearing surfaces of each of said bearing
surface assemblies, wherein said bearing surface assemblies being individually adjustable.
35. The prosthesis as set forth in Claim 1 further comprises a non-expandable
core, said core having expandable bearing surfaces extending therefrom, wedge means
extending between said expandable bearing surfaces whereby rotation of the wedge means
in one direction moves the outer bearing surfaces apart.
36. The prosthesis as set forth in Claim 1 comprising two or more sets of opposed complimentary bearing surface assemblies, each of said bearing surface assemblies having geared teeth extending therefrom whereby movement of one set of
geared teeth will move the other set of geared teeth in order to adjust the distance between
the outer bearing surfaces of all bearing surface assemblies and the height of said prosthesis.
37. The prosthesis as set forth in Claim 1 wherein one set of bearing surface
assemblies is mounted between an intermediate vertebrae and an upper vertebrae and
another set of bearing surface assemblies is mounted between said intermediate vertebrae
and a lower vertebrae, wherein connecting and stabilizing means are mounted between the
spaced bearing surface assemblies.
38. The prosthesis as set forth in Claim 37 wherein said connecting and stabilizing means comprises a clamping plate attachable to said intermediate vertebrae,
said clamping plate having connecting and stabilizing rods extending therefrom, and said
connecting rods extending beyond said intermediate vertebrae and abutting said walls of
said bearing surface assemblies.
39. The prosthesis as set forth in Claim 1 wherein a rigid bio-resorbable
material is provided between said bearing surface assemblies and wherein flexible resilient
bearing means are mounted between and engage said bearing surface assemblies, whereby
upon degradation of said bio-resorbable material, the flexible and resilient means will remain between said bearing surface assemblies.
40. A method of employing a spinal prosthesis for achieving stability of adjacent vertebrae and preserving the inter-disc space comprising the steps of:
surgically exposing an area for placement of said spinal prosthesis between adjacent vertebrae; inserting said prosthesis in said space between adjacent vertebral end plates; providing said prosthesis with outer bearing surfaces abutting adjacent bone
structure on said vertebral end plates;
providing osseous integration and bone in-growth through said outer bearing
surfaces of said prosthesis;
providing said prosthesis a rigid bio-compatible, bio-resorbable material to
maintain said space between said vertebral end plates, whereby osseous integration
causing solidification of said vertebral end plates with said bearing surfaces of said
prosthesis and said rigid bio-resorbable material being resorbed, allowing said prosthesis
to become flexible and still maintain the established inter-disc space created by said
prosthesis originally.
41. The method as in Claim 40 wherein said bio-compatible, bio-resorbable
material is a polymer that is photocurable by ultra-violet light in the range of 350-385
nanometers in wavelength.
42. The method as in Claim 40 wherein said bio-compatible, bio-resorbable
material is a polymer that is photocurable by visible light in the range of 385-550
nanometers in wavelength.
43. The method as in Claim 42 wherein said bio-resorbable material contains
substance that promotes osseous integration and bone in-growth.
44. The method as in Claim 42 wherein said bio-resorbable material is pliable and putty-like in an uncured state and not pliable in the cured state.
45. The method as in Claim 44 wherein said bio-resorbable material is colored
in an uncured state and turns clear in the cured state.
46. The method as in Claim 42 wherein said bio-resorbable material contains
hemostatic factors to control bleeding.
47. The method as in Claim 42 wherein said bio-resorbable material contains
anti-viral drug to control and prevent infection.
48. The method as in Claim 42 wherein said bio-resorbable material contains
radiation beads.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2000/020526 WO2002009626A1 (en) | 1999-07-26 | 2000-07-27 | Improved spinal surgical prosthesis |
US10/072,163 US6719796B2 (en) | 1999-07-26 | 2002-02-07 | Spinal surgical prosthesis |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/360,796 US6454806B1 (en) | 1999-07-26 | 1999-07-26 | Spinal surgical prosthesis |
PCT/US2000/020526 WO2002009626A1 (en) | 1999-07-26 | 2000-07-27 | Improved spinal surgical prosthesis |
US10/072,163 US6719796B2 (en) | 1999-07-26 | 2002-02-07 | Spinal surgical prosthesis |
Publications (1)
Publication Number | Publication Date |
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US7282063B2 (en) | 2007-10-16 |
US6719796B2 (en) | 2004-04-13 |
US20020128716A1 (en) | 2002-09-12 |
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