EP1906886A2 - Multi-composite disc prosthesis - Google Patents
Multi-composite disc prosthesisInfo
- Publication number
- EP1906886A2 EP1906886A2 EP06774673A EP06774673A EP1906886A2 EP 1906886 A2 EP1906886 A2 EP 1906886A2 EP 06774673 A EP06774673 A EP 06774673A EP 06774673 A EP06774673 A EP 06774673A EP 1906886 A2 EP1906886 A2 EP 1906886A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- biomaterial
- disc
- weight percent
- disc prosthesis
- range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
-
- 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
- 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
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
-
- 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
- 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
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30016—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
- A61F2002/30387—Dovetail connection
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- 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
Definitions
- Provisional Patent Application No. 60/660,107 entitled “MODULAR DISC PROSTHESIS,” filed March 9, 2005, and also U.S. Provisional Patent Application No. 60/700,459, entitled
- PROSTHESIS the disclosure of which is hereby incorporated by reference.
- the present invention relates generally to an implantable prosthesis for repairing damaged intervertebral discs. More particularly, the present invention relates to an artificial nucleus replacement prosthesis comprising a multi-part composite disc prosthesis that includes a first softer outer biomaterial and a second harder inner biomaterial.
- the spinal motion segment consists of a unit of spinal anatomy bounded by two vertebral bodies, including the two vertebral bodies, the interposed intervertebral disc, as well as the attached ligaments, muscles, and the facet joints.
- the disc consists of the end plates at the top and bottom of the vertebral bones, the soft inner core, called the nucleus and the annulus fibrosis running circumferentially around the nucleus. In normal discs, the nucleus cushions applied loads, thus protecting the other elements of the spinal motion segment.
- a normal disc responds to compression forces by bulging outward against the vertebral end plates and the annulus fibrosis.
- the annulus consists of collagen fibers and a smaller amount of elastic fibers, both of which are effective in resisting tension forces. However, the annulus on its own is not very effective in withstanding compression and shear forces.
- Degeneration of the intervertebral discs may also occur in people as a result of degenerative disc disease.
- Degenerative disc disease of the spine is one of the most common conditions causing pain and disability in our population.
- the nucleus dehydrates.
- its ability to act as a cushion is reduced.
- the dehydrated nucleus is no longer able to bear loads, the loads are transferred to the annulus and to the facet joints.
- the annulus and facet joints are not capable of withstanding their increased share of the applied compression and torsional loads, and as such, they gradually deteriorate.
- annulus and facet joints deteriorate, many other effects ensue, including the narrowing of the interspace, bony spur formation, fragmentation of the annulus, fracture and deterioration of the cartilaginous end plates, and deterioration of the cartilage of the facet joints.
- the annulus and facet joints lose their structural stability and subtle but pathologic motions occur between the spinal bones.
- Some of these methods include: heating the annular region to destroy nerve endings and strengthen the annulus; applying rigid or semi-rigid support members on the sides of the motion segment or within the disc space; removing and replacing the entire disc with a generally rigid plastic, articulating artificial device; removing and replacing the nucleus; and spinal fusion involving permanently fusing the vertebrae adjacent the affected disc.
- spinal fusion has generally been regarded as the most effective surgical treatment to alleviate back pain due to degeneration of a disc. While this treatment is often effective at relieving back pain, all discal motion is lost in the fused spinal motion segment. The loss of motion in the affected spinal segment necessarily limits the overall spinal mobility of the patient. Ultimately, the spinal fusion places greater stress on the discs adjacent the fused segment as these segments attempt to compensate for lack of motion in the fused segment, often leading to early degeneration of these adjacent spinal segments. current ⁇ eveiopments are focusing on treatments that can preserve some or all of the motion of the affected spinal segment. One of these methods to stabilize the spinal motion segment without the disadvantages of spinal fusion is total disc replacement.
- Total disc replacement is a highly invasive and technically demanding procedure which accesses the disc from an anterior or frontal approach and includes dividing the anterior longitudinal ligament, removing the cartilaginous end plates between the vertebral bone and the disc, large portions of the outer annulus and the complete inner nucleus. Then an artificial total disc prosthesis is carefully placed in the evacuated disc space.
- Many of the artificial total disc prosthesis currently available consist of a generally rigid plastic such as ultra high molecular weight polyethelyene (“UHMWPE) as the nucleus that is interposed between two metal plates that are anchored or attached to the vertebral endplates.
- UHMWPE ultra high molecular weight polyethelyene
- nucleus replacements are also inert, non-biological prostheses.
- the procedure for implanting a nucleus replacement is less invasive than the procedure for a total disc replacement and generally includes the removal of only the nucleus and replacement of the nucleus with a prosthesis that may be malleable and provide cushioning that mimics a natural disc nucleus.
- Examples of the prostheses used for nucleus replacement include: U.S. Pat. Nos. 4,772,287, 4,904,260, 5,192,326, 5,919,236 and 6,726,721.
- Nucleus replacements are intended to more closely mimic natural disc mechanics. To that end, some nucleus replacements utilize hydrogels because of their water imbibing properties that enable these replacements to expand in situ to permit a more complete filling of the evacuated nucleus cavity. However, there is usually a trade-off in that the more expansion the hydrogel achieves, the less structural support the end product can provide. As a result, many hydrogel nucleus disc replacements have generally adopted the use of some form of a jacket or fabric to constrain the hydrogel material. For example, the implant described in U.S. Patent Nos. 4,772,287 and 4,904,260 consists of a block of hydrogel encased in a plastic fabric casing. The implant described in U.S. Pat. No.
- 5,192,326 consists of hydrogel beads enclosed by a fabric shell. Without the jacket or other form of constraint, the hydrogel is susceptible to displacement because of the slippery nature of the hydrogel. Unfortunately, the jacket or fabric shell will be subject to long term abrasive wear issues that could result in failure of jacket or shell's ability to constrain the hydrogel and thus the hydrogel may be subject to displacement.
- nucleus replacement involves implantation of a balloon or other container into the nucleus, which is then filled with a biocompatible material that hardens in situ.
- examples of this in situ approach to nucleus replacement include U.S. Patent Nos. 6,443,988 and 7,001,431.
- One of the problems with this approach is that the chemical hardening process is exothermic and can generate significant amounts of heat that may cause tissue damage.
- the balloon may rupture during expansion, causing leakage of material into the disc cavity and surrounding tissues, which may cause undesirable complications.
- 2005/0119752A1 to Williams et al that discloses an artificial intervertebral disc fabricated of hydrogel, polyurethane, thermoplastic elastomers or other biocompatible materials wherein the softer inner nucleus portion has a Shore A hardness in the range of 20-70 and the harder outer portion has a Shore A hardness in the range of 35-90. While seemingly similar to the natural soft-hard combination of the disc nucleus and annulus, these implants still have the same approach and problems as the sandwiched metal and polymer implants.
- the present invention is a multi-composite disc prosthesis that is adapted to be implanted within the annulus of an evacuated disc nucleus space in a human spine.
- the disc prosthesis has a generally solid unitary body with a size and a shape adapted to be positioned within the annulus of the evacuated disc nucleus space.
- the body has an outer portion comprised of a first biomaterial and an inner portion comprised of a second biomaterial.
- the second biomaterial has a compressive modulus that is harder than the compressive modulus of the first biomaterial and the first and second biomaterials may be bonded together to form a multi-composite material that forms the solid body.
- the present invention is an alternative to total disc replacement.
- the device of the present invention uses biocompatible materials to replace the disc nucleus.
- the present invention has many advantages over currently available nucleus replacements.
- One such advantage is that in certain embodiments the nucleus replacement of the present invention may be inserted through a minimally invasive procedure through a small hole in the posterior annulus, leaving much of the annulus and surrounding vertebral cartilage intact.
- the device of the present invention will offer pain relief by retensioning the annulus, providing a cushioning effect and restoring a more normal distribution of pressure between the annulus and the nucleus.
- the nucleus replacement consists of at least two biocompatible materials including an inner layer of a hard modulus biomaterial and an outer surrounding coat of a softer modulus biomaterial.
- the implant may include an outer soft modulus biomaterial and inner hard modulus biomaterial.
- the outer soft modulus biomaterial and the inner hard modulus biomaterial may be chemically bonded.
- the implant comprises a composite system of two biomaterials, wherein the biomaterials may consist of a biocompatible polyurethane based on a diisocyanate and a polyol.
- the implant may consist of several interconnected segments that slide along a track formed of the hard modulus material such that each segment is sequentially inserted into the disc space and connected to the other segments forming a unitary device.
- Figure 1 is a cross sectional view of a modular disc prosthesis according to the present invention.
- Figure 2 is a view of a modular disc prosthesis according to the present invention at a first stage of insertion.
- Figure 3 is a view of a modular disc prosthesis according to the present invention at the final stage of insertion.
- the present invention comprises a composite system wherein the outer portion consists of soft modulus material mimicking the natural disc and the inner portion consists of harder modulus material which provides support and stability.
- Two biocompatible polymers may be chemically bonded to form the composite system of the present invention.
- Many conventional total disc replacements include upper and lower rigid plates and a non-rigid material disposed therebetween, while other existing nuclear replacements consist of a mass of soft material without a stabilizing hard inner core.
- the composite system of the present invention offers advantages over the existing devices in that the soft outer portion provides cushioning while not eroding the endplates as may happen with harder materials of other disc nucleus replacements.
- the soft outer portion is deformable to correspond to the desired modulus in response to normal physiologic forces of about 30 to 300 pounds. Because of this deformability, the prosthesis produces a physiologically appropriate amount of loading on the end plates of the intervertebral disc. As a result, the end plates will not excessively deform over time and ultimately conform to the contours of the implant as is the case with more rigid disc nucleus replacement implants. Further, the harder inner core of the present invention provides support and stability lacking in the implants made of hydrogel blocks or chunks.
- the nucleus replacement 10 may include several components that are sequentially inserted into the evacuated disc nucleus space. This sequential insertion allows for a small surgical exposure because the device is inserted one component at a time as opposed to some problematic devices that are inserted in their entirety requiring a larger surgical exposure.
- each component 20 may be composed of an inner connecting track of hard modulus biomaterial 22 and an outer surrounding coat of a softer modulus biomaterial 24.
- the first component may slide along a track consisting of a high modulus biomaterial and into place within the disc annulus.
- the device is inserted in a minimally invasive procedure through a small opening in the posterior annulus.
- the device of the present invention may consist of two biocompatible materials of different hardness.
- the biomaterials may consist of a biocompatible polyurethane based on a diisocyanate and a polyol.
- the isocyanate component may be 4,4'-diphenylmethane diisocyanate ('MDI") and the polyol component may be a combination of polytetramethyleneoxide (“PTMO”) 1000 and PTMO 2000.
- the polymers may also contain a chain extender, a cross linking agent and a catalyst.
- the chain extender may be 1,4-butanediol ("BDO”); the cross linking agent may be trimethylpropane (“TMP”) and the catalyst may be bis-(dodecylthio)-dimethylstannane (“Fomrez catalyst UL22").
- TMP trimethylpropane
- the catalyst may be bis-(dodecylthio)-dimethylstannane
- the two biomaterials may be bonded together forming a composite system.
- bonding may be chemical or physical.
- such bonding may include a urethane bond.
- biomaterials suitable for the composition of the present nucleus prosthesis are contemplated and are within the scope of the present disclosure.
- Other biomaterials that may be used within the scope of the present invention include, but are not limited to: hydrogels, rubbers, silicones, thermoplastic elastomers, acrylate monomers, curable epoxies, curable monomers and any combination thereof.
- the outer surrounding coat of the device may be comprised of a first biomaterial consisting of a softer polymer that provides cushioning and support, mimicking the characteristics of a natural disc nucleus.
- the outer polymer may be modified to provide for elution of medicants such as analgesics, antibiotics, antineoplastics, or bioosteologics such as bone growth agents or any other desired material. While motion preservation is generally a principle goal in nucleus replacement, in certain indications it may be desirable to promote some bony fusion. Such indications may include nuclear replacements in the cervical spine.
- the solid polymer outer shell of the modular disc nucleus prosthesis may provide for better and more controllable elution rates than some hydrogel materials.
- the modular disc nucleus prosthesis may include different elution rates for each polymer material. This would allow for varying elution rates for different medicants.
- the softer biomaterial may consist of a harder segment content in the range of about 15 to 25 weight percent.
- One of ordinary skill in the art will recognize that additional ranges of hard segment weight percent within this explicit range are contemplated and are within the scope of the present disclosure.
- the softer biomaterial may have a compressive modulus in the range of about 10-20 MPa.
- the softer biomaterial may have a Shore A hardness no greater than 80 and a Shore D hardness no greater than 40.
- the tensile strength of the softer biomaterial may be in the range of 10-30 MPa.
- the softer biomaterial may have a yield strength of 1-1.5 MPa.
- the modulus of elasticity of the softer biomaterial may be in the range of 6-8 MPa.
- One embodiment of device may further include a second biomaterial.
- the second biomaterial may consist of a harder polymer of high durometer, preferably of at least a Shore D hardness of 55. The hardness of the second biomaterial provides structural support for the insertion track and the interlocking mechanism.
- the second biomaterial may consist of a thermoplastic polyether-urethane or polycarbonate-urethane, such as Pellethane ® , Tecothane ® or Bionate ® .
- the second biomaterial may consist of poly-ether-ether-ketone (PEEK) or another polymer of similar stiffness.
- the second biomaterial may consist of a MDI, PTMO based polyurethane processed to have a hard segment weight content in the range of about 50 to 70 percent, smaller homogenous molecular weight chain lengths in the prepolymer and an optimal micro-phase separation of the hard and soft segment components to provide a macroscopically homogenous distribution in the cured polymer.
- a hard segment weight content in the range of about 50 to 70 percent, smaller homogenous molecular weight chain lengths in the prepolymer and an optimal micro-phase separation of the hard and soft segment components to provide a macroscopically homogenous distribution in the cured polymer.
- the harder biomaterial may have a tensile strength in the range of 40-75 MPa.
- the yield strength of the harder biomaterial may be in the range of 20-45 MPa.
- the harder biomaterial may have a modulus of elasticity in the range of 400-700 MPa.
- the compressive modulus of the harder biomaterial may be in the range of 200-400 MPa.
- the weight percent of the MDI may be in a range of 5 to 35 weight percent of the total cured polymer. In an alternate embodiment of the first softer biomaterial, the weight percent of the MDI may be in a range of 15 to 25 weight percent of the total cured polymer. In one embodiment, the weight percent of the MDI may be in a range of about 18 to 20 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of MDI weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the PTMO 1000 of the first softer biomaterial may be in a range of 0 to 40 weight percent of the total cured polymer. In an alternate embodiment, the weight percent of the PTMO 1000 may be in a range of 10 to 30 weight percent of the total cured polymer. In one embodiment, the weight percent of the PTMO 1000 may be in a range of 25 to 27 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of PTMO 1000 weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the PTMO 2000 of the first softer biomaterial may be in a range of 0 to 80 weight percent of the total cured polymer. In an alternate embodiment, the weight percent of the PTMO 2000 may be in a range of 40 to 60 weight percent of the total cured polymer. In one embodiment, the weight percent of the PTMO 2000 may be in a range of 52 to 54 weight percent of the total cured polymer.
- the weight percent of the BDO of the first softer biomaterial may be in a range of 0 to 10 weight percent of the total cured polymer.
- the weight percent of the BDO may be in a range of 0 to 5 weight percent of the total cured polymer. In one embodiment, the weight percent of the BDO may be in a range of 1 to 2 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of BDO weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the TMP of the first softer biomaterial may be in a range of 0 to 5 weight percent of the total cured polymer. In an alternate embodiment, the weight percent of the TMP may be in a range of 0 to 0.1 weight percent of the total cured polymer. In one embodiment, the weight percent of the TMP may be in a range of 0.06 to 0.08 weight percent of the total cured polymer.
- the weight percent of the UL22 of the first softer biomaterial may be in a range of 0 to 2 weight percent of the total cured polymer.
- the weight percent of the UL22 may be in a range of 0 to 1 weight percent of the total cured polymer. In one embodiment, the weight percent of the UL22 may be in a range of 0.0001 to 0.0030 weight percent of the total cured polymer.
- weight percent of the UL22 may be in a range of 0.0001 to 0.0030 weight percent of the total cured polymer.
- the combined weights of the MDI and BDO generally correlate to the hard segment content and hardness of the cured polymer. In an embodiment of the first softer biomaterial, the combined weight percentage of the MDI and BDO may be in a range of about 15 to 25 weight percent of the total cured polymer. In one embodiment of the first softer biomaterial, the combined weight percentage of the MDI and BDO may be in a range of about 20 to 22 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of combined MDI and BDO weight percentages of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the first softer biomaterial may comprise two separate prepolymers, Part A and Part B, that are mixed together to form the cured polymer.
- Part A is formed by processing MDI and PTMO 2000 together and
- Part B is formed by processing PTMO 1000, BDO, TMP and UL22 together. Any combination of MDI, PTMO 1000, PTMO 2000, BDO, TMP, UL22 and/or other suitable constituents may be processed to form the prepolymers, Part A and Part B.
- Part A and Part B may be mixed such that the total isocyanate to polyol ratio is in the range of about 0.96 to 1.04.
- Part A and Part B may be mixed together such that the total isocyanate to polyol ratio is in the range of about 1.01 to 1.03.
- the total isocyanate to polyol ratio is in the range of about 1.01 to 1.03.
- the weight percent of the MDI of the second harder biomaterial may be in a range of 30 to 70 weight percent of the total cured polymer. In an alternate embodiment of the second harder biomaterial, the weight percent of the MDI may be in a range of 40 to 60 weight percent of the total cured polymer. In one embodiment of the second harder biomaterial, the weight percent of the MDI may be in a range of about 47 to 49 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of MDI weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the PTMO 1000 of the second harder biomaterial may be in a range of 0 to 40 weight percent of the total cured polymer. In an alternate embodiment of the second harder biomaterial, the weight percent of the PTMO 1000 may be in a range of 10 to 30 weight percent of the total cured polymer. In one embodiment of the second harder biomaterial, the weight percent of the PTMO 1000 may be in a range of about 20 to 22 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of PTMO 1000 weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the PTMO 2000 of the second harder biomaterial may be in a range of 0 to 40 weight percent of the total cured polymer. In an alternate embodiment of the second harder biomaterial, the weight percent of the PTMO 2000 may be in a range of 10 to 30 weight percent of the total cured polymer. In one embodiment of the second harder biomaterial, the weight percent of the PTMO 2000 may be in a range of about 15 to 17 weight percent of the total cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of PTMO 2000 weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the BDO of the second harder biomaterial may be in a range of 0 to 35 weight percent of the total cured polymer. In an alternate embodiment of the second harder biomaterial, the weight percent of the BDO may be in a range of 5 to 25 weight percent of the total cured polymer. In one embodiment of the second harder biomaterial, the weight percent of the BDO may be in a range of about 14 to 16 weight percent of the total cured polyurethane.
- One of ordinary skill in the art will recognize that additional ranges of BDO weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the TMP of the second harder biomaterial may be in a range of 0 to 5 weight percent of the total cured polyurethane. In an alternate embodiment of the second harder biomaterial, the weight percent of the TMP may be in a range of 0 to 1 weight percent of the total cured polyurethane. In one embodiment of the second harder biomaterial, the weight percent of the TMP may be in a range of about 0.1 to 0.3 weight percent of the total cured polyurethane.
- TMP weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the weight percent of the UL22 of the second harder biomaterial may be in a range of 0 to 2 weight percent of the total cured polyurethane. In an alternate embodiment of the second harder biomaterial, the weight percent of the UL22 may be in a range of 0 to 1 weight percent of the total cured polyurethane. In one embodiment of the second harder biomaterial, the weight percent of the UL22 may be in a range of about 0.0001 to 0.002 weight percent of the total cured polyurethane.
- One of ordinary skill in the art will recognize that additional ranges of UL22 weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the combined weights of the MDI and the BDO generally correlate to the hard segment content and hardness of the cured polymer.
- the combined weight of the MDI and BDO may be in the range of about 50 to 70 weight percent of the total weight of the cured polymer. In one embodiment, the combined weight of the MDI and BDO may be in the range of about 62 to 64 weight percent of the total weight of the cured polymer.
- One of ordinary skill in the art will recognize that additional ranges of combined MDI and BDO weight percent of the total cured polymer within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- the second harder biomaterial may be comprised of two separate prepolymers, Part A and Part B.
- Part A and Part B may be selected from the group consisting of MDI, TDI, PTMO 1000, PTMO 2000, BDO, TMP, UL22 or any other combination of suitable constituents.
- Part A may be processed such that the prepolymer contains smaller molecular weight chain lengths of one or two polymer populations than that of Part B.
- the MDI, PTMO 1000 and PTMO 2000 are processed together to form the Part A.
- the BDO, TMP and UL22 are processed together to form the Part B.
- Part A and Part B may be mixed such that the total isocyanate to polyol ratio is in the range of about 0.96 to 1.04. In one embodiment, the isocyanate to polyol ratio is in the range 1.01 to 1.03.
- additional ranges of isocyanate to polyol ratios within the above described explicit ranges are contemplated and are within the scope of the present disclosure.
- Various modifications to the disclosed apparatuses and methods may be apparent to one of skill in the art upon reading this disclosure. The above is not contemplated to limit the scope of the present invention, which is limited only by the claims below.
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70045905P | 2005-07-19 | 2005-07-19 | |
US11/372,357 US7267690B2 (en) | 2005-03-09 | 2006-03-09 | Interlocked modular disc nucleus prosthesis |
US11/372,477 US7591853B2 (en) | 2005-03-09 | 2006-03-09 | Rail-based modular disc nucleus prosthesis |
PCT/US2006/028020 WO2007012003A2 (en) | 2005-03-09 | 2006-07-19 | Multi-composite disc prosthesis |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1906886A2 true EP1906886A2 (en) | 2008-04-09 |
EP1906886A4 EP1906886A4 (en) | 2012-05-02 |
Family
ID=39989762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06774673A Withdrawn EP1906886A4 (en) | 2005-07-19 | 2006-07-19 | Multi-composite disc prosthesis |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1906886A4 (en) |
CN (1) | CN101267783A (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6517580B1 (en) * | 2000-03-03 | 2003-02-11 | Scient'x Societe A Responsabilite Limited | Disk prosthesis for cervical vertebrae |
US20030220649A1 (en) * | 1994-05-06 | 2003-11-27 | Qi-Bin Bao | Intervertebral disc prosthesis |
US20040249459A1 (en) * | 2003-06-02 | 2004-12-09 | Ferree Bret A. | Nucleus replacements with asymmetrical stiffness |
US20050065613A1 (en) * | 2003-09-24 | 2005-03-24 | Gross Jeffrey M. | Reinforced fusion implant |
US20050154463A1 (en) * | 2000-08-30 | 2005-07-14 | Trieu Hal H. | Spinal nucleus replacement implants and methods |
WO2006127849A2 (en) * | 2005-05-24 | 2006-11-30 | Vertebral Technologies, Inc. | Rail-based modular disc nucleus prosthesis |
-
2006
- 2006-07-19 CN CNA2006800342619A patent/CN101267783A/en active Pending
- 2006-07-19 EP EP06774673A patent/EP1906886A4/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030220649A1 (en) * | 1994-05-06 | 2003-11-27 | Qi-Bin Bao | Intervertebral disc prosthesis |
US6517580B1 (en) * | 2000-03-03 | 2003-02-11 | Scient'x Societe A Responsabilite Limited | Disk prosthesis for cervical vertebrae |
US20050154463A1 (en) * | 2000-08-30 | 2005-07-14 | Trieu Hal H. | Spinal nucleus replacement implants and methods |
US20040249459A1 (en) * | 2003-06-02 | 2004-12-09 | Ferree Bret A. | Nucleus replacements with asymmetrical stiffness |
US20050065613A1 (en) * | 2003-09-24 | 2005-03-24 | Gross Jeffrey M. | Reinforced fusion implant |
WO2006127849A2 (en) * | 2005-05-24 | 2006-11-30 | Vertebral Technologies, Inc. | Rail-based modular disc nucleus prosthesis |
Non-Patent Citations (1)
Title |
---|
See also references of WO2007012003A2 * |
Also Published As
Publication number | Publication date |
---|---|
CN101267783A (en) | 2008-09-17 |
EP1906886A4 (en) | 2012-05-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8038718B2 (en) | Multi-composite disc prosthesis | |
Bao et al. | Artificial disc technology | |
US7066960B1 (en) | Intervertebral disk replacement | |
Bao et al. | The artificial disc: theory, design and materials | |
JP3909049B2 (en) | Radiovisible hydrogel intervertebral disc nucleus | |
US8353964B2 (en) | Anatomic total disc replacement | |
US20020045942A1 (en) | Procedure for repairing damaged discs | |
US20060241758A1 (en) | Facet spacers | |
JP2007504899A (en) | Flexible spine | |
EP1883378B1 (en) | Rail-based modular disc nucleus prosthesis | |
WO2010059495A2 (en) | Device & method for restoring joints with artificial cartilage | |
Joshi | Mechanical behavior of the human lumbar intervertebral disc with polymeric hydrogel nucleus implant: an experimental and finite element study | |
EP1906886A2 (en) | Multi-composite disc prosthesis | |
Muckley et al. | Intervertebral disc and nucleus replacement devices and instrumentations |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20080128 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: FELT, JEFFREY, C.VERTEBRAL TECHNOLOGIES, INC. Inventor name: SHAFER, ALBERTVERTEBRAL TECHNOLOGIES, INC. Inventor name: PALM, ERIC, E.VERTEBRAL TECHNOLOGIES, INC. Inventor name: JERONI, JENNYVERTEBRAL TECHNOLOGIES, INC. |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20120330 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: A61F 2/44 20060101AFI20120326BHEP |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20121030 |