US20070299524A1 - Artificial intervertebral disc - Google Patents
Artificial intervertebral disc Download PDFInfo
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- US20070299524A1 US20070299524A1 US11/759,609 US75960907A US2007299524A1 US 20070299524 A1 US20070299524 A1 US 20070299524A1 US 75960907 A US75960907 A US 75960907A US 2007299524 A1 US2007299524 A1 US 2007299524A1
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- protrusion
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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
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
- A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
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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
- 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
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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
- 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
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
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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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- A61F2002/30001—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
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
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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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- A61F2002/30001—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
- A61F2002/30448—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
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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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30649—Ball-and-socket joints
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- 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
- A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
- A61F2002/30682—Means for preventing migration of particles released by the joint, e.g. wear debris or cement particles
- A61F2002/30685—Means for reducing or preventing the generation of wear particulates
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- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2002/30929—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth having at least two superposed coatings
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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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- A61F2002/30971—Laminates, i.e. layered products
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- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
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- A—HUMAN NECESSITIES
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- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
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- A—HUMAN NECESSITIES
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- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/005—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
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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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
Definitions
- the invention relates to designs of artificial intervertebral discs for prosthetic and dummy applications.
- Intervertebral disc prosthetics must comply with several requirements, often contradicting each other. These requirements are derived from studies on natural intervertebral discs.
- the prosthetic artificial disc should provide angular mobilities with specified ranges and stiffness values (two bending mobilities, fore-and-aft and side-to-side, and torsional around the axis of the spine), while accommodating large and varying axial (vertical) loading; it is desirable that the stiffness values are not significantly influenced by the changing vertical loads.
- Dummies are mock-ups of human bodies designed to simulate behavior of human bodies in extreme circumstances, e.g. crash dummies. Dummies are not, usually, equipped with all individual vertebras simulating the human spinal column but have structural elements rather crudely simulating the human spine.
- the subject invention eliminates the listed shortcomings.
- the instant invention proposes an artificial intervertebral disc providing for angular displacements between adjacent vertebrae wherein these displacements are accommodated by internal shear in an elastomeric layered element residing between the upper and lower adjacent vertebrae, without sliding.
- the preferred embodiment of the invention has upper and lower rigid bases attached, respectively, to the upper and lower adjacent vertebrae.
- One of the bases has a spherical convex protrusion and another has a coaxial concave spherical socket, with these two spherical surfaces having the common center.
- the elastomeric layered element is placed between and attached to these convex and concave spherical surfaces.
- both upper and lower bases have concave spherical sockets and an intermediate rigid element has two coaxial convex spherical protrusions on its upper and lower sides, with the upper protrusion being coaxial with and having the common center with the concave spherical socket on the upper base, with the lower protrusion being coaxial with and having the common center with the convex spherical socket on the lower base, and the elastomeric layered element consists of two elastomeric layers, one of which is placed between and attached to the two upper spherical surfaces and another is placed between and attached to the two lower spherical surfaces.
- both upper and lower bases have convex spherical protrusions and an intermediate rigid element has two coaxial concave spherical sockets on its upper and lower sides, with the upper socket being coaxial with and having the common center with the convex spherical protrusion on the upper base, with the lower socket being coaxial with and having the common center with the convex spherical protrusion on the lower base, and the elastomeric layered element consists of two elastomeric layers, one of which is placed between and attached to the two upper spherical surfaces and another is placed between and attached to the two lower spherical surfaces.
- Yet another embodiment of the proposed artificial intervertebral disc is characterized by having means for preloading the elastomeric layered element in compression.
- FIG. 1 shows a correlation between elastomer (rubber) hardness measured by standard measuring tool—Shore Durometer at its “A” scale and Young's modulus of the elastomer.
- FIG. 2 shows a cross section of the proposed artificial intervertebral disc with elastomeric layered element placed between the spherical socket in the upper base and the spherical protrusion in the lower base.
- FIG. 3 gives a cross section of spherical elastomeric element constructed as a laminate with two layers of rubber and one intermediate layer of a rigid material.
- FIG. 4 shows a plan view of the elastomeric element shaped for providing a relatively high angular stiffness of the artificial disc around the spinal axis as compared with its bending angular stiffness values.
- FIG. 5 shows a plan view of the elastomeric element shaped for providing a relatively low angular stiffness of the artificial disc around the spinal axis as compared with its angular bending stiffness values.
- FIG. 6 depicts the axial cross section of the artificial spinal disc having an intermediate double-convex element interacting with the lower and upper bases via elastomeric layered element.
- FIG. 7 depicts the axial cross section of the artificial spinal disc having an intermediate double-concave element interacting with the lower and upper bases via elastomeric layers.
- FIG. 8 illustrates modification of artificial discs with intermediate elements, as shown in FIGS. 6 and 7 , which can be axially preloaded before insertion.
- a “rigid” component in this specification means a component having significantly lesser deformations than the elastomeric element(s) connecting these components.
- FIGS. 2, 6 , 7 , and 8 Four embodiments of the proposed disc design are shown in FIGS. 2, 6 , 7 , and 8 .
- FIG. 2 shows an artificial disc comprising lower base 1 and upper base 2 , both made of a metal, plastic, or other rigid material.
- One of the bases has a convex spherical protrusion 3 (shown on the lower base 1 ), while another base (top base 2 in FIG. 2 ) has a concave spherical socket 4 coaxial with protrusion 3 .
- Bases 1 and 2 do not have a direct contact, and the space between protrusion 3 and socket 4 is filled with elastomeric element 5 which constitutes a layer or a laminate (see below) of uniform thickness, attached by known means (bonded, glued, mechanically attached, etc.) to both convex and concave spherical surfaces of protrusion 3 and socket 4 .
- Elastomeric element 5 is shown in FIG. 2 as a “solid” rubber layer, contacting with the full surface area of socket 4 and protrusion 3 . However, it can be designed with smaller area, as shown in FIGS. 4, 5 below. While an elastomeric element comprising one layer of rubber is shown in FIG. 2 , it can be embodied as a rubber-metal laminate. Such a laminate comprising two layers 6 and 7 of rubber with thin layer 8 made of metal or other material rigid in extension, such as strong fabric, between the layers of rubber is shown in FIG. 3 .
- Spherical elastomeric layer or laminate 5 is conforming spherical surfaces of protrusion 3 and socket 4 , and can have a shape providing for desirable stiffness values in different directions.
- layers 5 a and 5 b of the same spherical radius shown in FIGS. 4 and 5 respectively, in the plan views are shown to have the same surface area, but different shapes, annular in FIG. 4 and solid of a small diameter in FIG. 5 .
- elastomeric element 5 in FIG. 2 may be beneficial in special cases.
- the artificial intervertebral disc shown in FIG. 2 has the convex spherical protrusion on the lower base and the concave spherical socket on the upper base, this arrangement can be reversed and the socket can be part of the lower base, while the spherical protrusion is made on the upper base.
- bases 1 and 2 as well as elastomeric element 5 must be made of bio-compatible materials.
- an angular bending displacement between the adjacent vertebras in ⁇ and/or ⁇ directions would induce the same angular displacement between lower 1 and upper 2 bases attached to these vertebras.
- the relative angular displacement in ⁇ and/or ⁇ directions between bases 1 and 2 having, respectively, convex and concave spherical surfaces centered at the same point and separated by elastomeric layered element 5 will be accommodated by a shear deformation of element 5 .
- Axial forces in the spinal column cause compression deformation of the layered elastomeric element.
- FIG. 6 illustrates another embodiment of the proposed prosthesis, comprising lower base 11 and top base 12 attached to the respective adjacent vertebrae.
- Each base has socket 13 , 14 , respectively, each socket having concave spherical surface.
- Intermediate element 15 has two convex spherical protrusions 16 and 17 with all four spherical surfaces being coaxial in the undeformed (initial) condition of the artificial disc.
- the elastomeric element comprises two elastomeric layers (shown) or laminates as presented in FIG. 3 .
- protrusion 16 and socket 13 The space between protrusion 16 and socket 13 is filled with elastomeric layer/laminate 18 of uniform thickness, attached (bonded, glued, etc.) to both convex and concave spherical surfaces of protrusion 16 and socket 13 .
- the space between protrusion 17 and socket 14 is filled with a elastomeric layer/laminate 19 of uniform thickness, attached (bonded, glued, etc.) to both convex and concave spherical surfaces of protrusion 17 and socket 14 .
- FIG. 7 illustrates yet another embodiment of the proposed artificial intervertebral disc, comprising lower base 21 and top base 22 attached to the respective adjacent vertebrae.
- Each base has spherical protrusion 23 , 24 , respectively, each protrusion having convex spherical surface.
- Intermediate element 25 has two concave spherical sockets 26 and 27 with all four spherical surfaces being coaxial in the undeformed (initial) condition.
- the elastomeric element comprises two elastomeric layers (shown) or laminates as presented in FIG. 3 .
- socket 26 and protrusion 23 The space between socket 26 and protrusion 23 is filled with elastomeric layer/laminate 28 of uniform thickness, attached (bonded, glued, etc.) to both concave and convex spherical surfaces of socket 26 and protrusion 23 .
- the space between socket 27 and protrusion 24 is filled with an elastomeric layer/laminate 29 of uniform thickness, attached (bonded, glued, etc.) to both concave and convex spherical surfaces of socket 27 and protrusion 24 .
- FIG. 8 shows an embodiment of the proposed prosthesis similar to the embodiment shown in FIG. 6 wherein the spherical joint is preloaded (and held captive) by means of preloading member 20 (a bolt is shown but other known designs of preloading elements can be employed).
- the preloading element 20 is attached to lower base 11 a and top base 12 a , but does not have a contact with intermediate element 15 a .
- the artificial disc can be preloaded with a specified load before insertion into the spinal column, resulting in modification of the axial stiffness.
- a similar preloading system can be applied to the embodiment shown in FIG. 7 .
Abstract
Description
- This patent application is a divisional of U.S. patent application Ser. No. 11/037,629 filed Jan. 12, 2005, which claims priority of U.S. Provisional Application Ser. No. 60/535,741 filed Jan. 13, 2004.
- The invention relates to designs of artificial intervertebral discs for prosthetic and dummy applications.
- Intervertebral disc prosthetics must comply with several requirements, often contradicting each other. These requirements are derived from studies on natural intervertebral discs. The prosthetic artificial disc should provide angular mobilities with specified ranges and stiffness values (two bending mobilities, fore-and-aft and side-to-side, and torsional around the axis of the spine), while accommodating large and varying axial (vertical) loading; it is desirable that the stiffness values are not significantly influenced by the changing vertical loads. Dummies are mock-ups of human bodies designed to simulate behavior of human bodies in extreme circumstances, e.g. crash dummies. Dummies are not, usually, equipped with all individual vertebras simulating the human spinal column but have structural elements rather crudely simulating the human spine. These structural elements will also be called “vertebras” in this specification. Maintaining the structural characteristics of artificial intervertebral discs in close similarity to the natural discs is very important in order to adequately simulate behavior of the human bodies in the course of the dummy-based experiments.
- There are various proposed designs of artificial intervertebral discs attempting to simulate structural characteristics, especially stiffness values and ranges of motion of the natural discs. The most widely used designs comprise spherical joints generated by a concave spherical socket engaged with a fitting convex spherical protrusion. Both surfaces are usually made from a low friction plastic capable of sliding without lubrication. While providing mobility in various angular directions and capable of accommodating axial loads, these designs have several shortcomings.
- These artificial discs do not have elastic characteristics resident in the discs of the natural spinal column in any of the three angular directions. The natural elastic resistances to the motions approximately proportional to the deformation angle are replaced in these prosthetic or artificial discs by frictional resistances, practically independent on the motion magnitude.
- Secondly, the motion resistances in all three directions (the friction forces) are increasing with the increasing axial force in the spinal column (which varies in the wide range). This also results in some unnatural feelings, since the elastic resistance forces in the natural spinal column are not significantly dependent on the axial force.
- Another shortcoming of the state-of-the-art prosthetics is an unavoidable difference between static and dynamic friction coefficients in spherical joint. This makes the motion resistance different in the beginning of the movement and in the process of movement, since the static friction coefficient is greater than the dynamic friction coefficient.
- Yet another shortcoming, which is also a result of frictional interaction in the spherical joint, is inevitable wear of the sliding connection. The wear is enhanced by sometimes high axial pressures in the spinal column which are too high for sliding plastic contacts. The wear process creates worn-out particles which are contaminating the area around the disc and may increase the friction forces if accumulated in the sliding connection.
- The subject invention eliminates the listed shortcomings.
- The instant invention proposes an artificial intervertebral disc providing for angular displacements between adjacent vertebrae wherein these displacements are accommodated by internal shear in an elastomeric layered element residing between the upper and lower adjacent vertebrae, without sliding.
- The preferred embodiment of the invention has upper and lower rigid bases attached, respectively, to the upper and lower adjacent vertebrae. One of the bases has a spherical convex protrusion and another has a coaxial concave spherical socket, with these two spherical surfaces having the common center. The elastomeric layered element is placed between and attached to these convex and concave spherical surfaces.
- In another embodiment of the proposed artificial intervertebral disc, both upper and lower bases have concave spherical sockets and an intermediate rigid element has two coaxial convex spherical protrusions on its upper and lower sides, with the upper protrusion being coaxial with and having the common center with the concave spherical socket on the upper base, with the lower protrusion being coaxial with and having the common center with the convex spherical socket on the lower base, and the elastomeric layered element consists of two elastomeric layers, one of which is placed between and attached to the two upper spherical surfaces and another is placed between and attached to the two lower spherical surfaces.
- In another embodiment of the proposed artificial intervertebral disc, both upper and lower bases have convex spherical protrusions and an intermediate rigid element has two coaxial concave spherical sockets on its upper and lower sides, with the upper socket being coaxial with and having the common center with the convex spherical protrusion on the upper base, with the lower socket being coaxial with and having the common center with the convex spherical protrusion on the lower base, and the elastomeric layered element consists of two elastomeric layers, one of which is placed between and attached to the two upper spherical surfaces and another is placed between and attached to the two lower spherical surfaces.
- Yet another embodiment of the proposed artificial intervertebral disc is characterized by having means for preloading the elastomeric layered element in compression.
-
FIG. 1 shows a correlation between elastomer (rubber) hardness measured by standard measuring tool—Shore Durometer at its “A” scale and Young's modulus of the elastomer. -
FIG. 2 shows a cross section of the proposed artificial intervertebral disc with elastomeric layered element placed between the spherical socket in the upper base and the spherical protrusion in the lower base. -
FIG. 3 gives a cross section of spherical elastomeric element constructed as a laminate with two layers of rubber and one intermediate layer of a rigid material. -
FIG. 4 shows a plan view of the elastomeric element shaped for providing a relatively high angular stiffness of the artificial disc around the spinal axis as compared with its bending angular stiffness values. -
FIG. 5 shows a plan view of the elastomeric element shaped for providing a relatively low angular stiffness of the artificial disc around the spinal axis as compared with its angular bending stiffness values. -
FIG. 6 depicts the axial cross section of the artificial spinal disc having an intermediate double-convex element interacting with the lower and upper bases via elastomeric layered element. -
FIG. 7 depicts the axial cross section of the artificial spinal disc having an intermediate double-concave element interacting with the lower and upper bases via elastomeric layers. -
FIG. 8 illustrates modification of artificial discs with intermediate elements, as shown inFIGS. 6 and 7 , which can be axially preloaded before insertion. - A “rigid” component in this specification means a component having significantly lesser deformations than the elastomeric element(s) connecting these components. Specifically, “rigid” is defined here as having the Young's modulus at least ten times greater than the Young's modulus E0 of an elastomer having hardness H60 on scale A of Shore Durometer. This corresponds, in accordance with the industry-accepted correlation shown in
FIG. 1 , to the Young's modulus E≈G>10E0=−40 MPa, where G is the shear modulus. - Four embodiments of the proposed disc design are shown in
FIGS. 2, 6 , 7, and 8. -
FIG. 2 shows an artificial disc comprising lower base 1 andupper base 2, both made of a metal, plastic, or other rigid material. One of the bases has a convex spherical protrusion 3 (shown on the lower base 1), while another base (top base 2 inFIG. 2 ) has a concavespherical socket 4 coaxial withprotrusion 3.Bases 1 and 2 do not have a direct contact, and the space betweenprotrusion 3 andsocket 4 is filled withelastomeric element 5 which constitutes a layer or a laminate (see below) of uniform thickness, attached by known means (bonded, glued, mechanically attached, etc.) to both convex and concave spherical surfaces ofprotrusion 3 andsocket 4.Elastomeric element 5 is shown inFIG. 2 as a “solid” rubber layer, contacting with the full surface area ofsocket 4 andprotrusion 3. However, it can be designed with smaller area, as shown inFIGS. 4, 5 below. While an elastomeric element comprising one layer of rubber is shown inFIG. 2 , it can be embodied as a rubber-metal laminate. Such a laminate comprising twolayers thin layer 8 made of metal or other material rigid in extension, such as strong fabric, between the layers of rubber is shown inFIG. 3 . -
Bases 1 and 2 inFIG. 2 are attached, respectively, to the lower and upper adjacent vertebrae (not shown). It is preferable that the centers of both convex and concave spherical surfaces coincide at one point, thus minimizing the resistance forces for angular displacements between the connected vertebras. Spherical elastomeric layer orlaminate 5 is conforming spherical surfaces ofprotrusion 3 andsocket 4, and can have a shape providing for desirable stiffness values in different directions. For example,layers FIGS. 4 and 5 , respectively, in the plan views are shown to have the same surface area, but different shapes, annular inFIG. 4 and solid of a small diameter inFIG. 5 . As a result, they have the same angular (shear) stiffness in two bending directions shown as α and β, butlayer 5 a,FIG. 4 , has significantly higher stiffness thanlayer 5 b,FIG. 5 , in y direction (torsional stiffness, rotation about the spine axis). Other shapes ofelastomeric element 5 inFIG. 2 may be beneficial in special cases. - While the artificial intervertebral disc shown in
FIG. 2 has the convex spherical protrusion on the lower base and the concave spherical socket on the upper base, this arrangement can be reversed and the socket can be part of the lower base, while the spherical protrusion is made on the upper base. - If the artificial disc is intended to be used as a prosthetic device, then
bases 1 and 2 as well aselastomeric element 5 must be made of bio-compatible materials. - In operation, an angular bending displacement between the adjacent vertebras in α and/or β directions would induce the same angular displacement between lower 1 and upper 2 bases attached to these vertebras. The relative angular displacement in α and/or β directions between
bases 1 and 2 having, respectively, convex and concave spherical surfaces centered at the same point and separated by elastomericlayered element 5, will be accommodated by a shear deformation ofelement 5. The shear resistance associated with this deformation will be of an elastic nature characteristic for elastomeric (rubberlike) materials and is approximately proportional to magnitude of the shear deformation and to shear modulus G=E0/3 of the elastomeric material. Axial forces in the spinal column cause compression deformation of the layered elastomeric element. - Numerous experiments have shown that the compression forces cause only a slight increase in the shear resistance, especially for thin layers of the elastomeric materials.
- Since there is no direct sliding contact between the upper and lower bases, there is no friction and no wear in the proposed artificial disc system, which operates in a close similarity to the natural intervertebral disc.
-
FIG. 6 illustrates another embodiment of the proposed prosthesis, comprisinglower base 11 andtop base 12 attached to the respective adjacent vertebrae. Each base hassocket Intermediate element 15 has two convexspherical protrusions FIG. 3 . The space betweenprotrusion 16 andsocket 13 is filled with elastomeric layer/laminate 18 of uniform thickness, attached (bonded, glued, etc.) to both convex and concave spherical surfaces ofprotrusion 16 andsocket 13. The space betweenprotrusion 17 andsocket 14 is filled with a elastomeric layer/laminate 19 of uniform thickness, attached (bonded, glued, etc.) to both convex and concave spherical surfaces ofprotrusion 17 andsocket 14. -
FIG. 7 illustrates yet another embodiment of the proposed artificial intervertebral disc, comprisinglower base 21 andtop base 22 attached to the respective adjacent vertebrae. Each base hasspherical protrusion Intermediate element 25 has two concavespherical sockets FIG. 3 . The space betweensocket 26 andprotrusion 23 is filled with elastomeric layer/laminate 28 of uniform thickness, attached (bonded, glued, etc.) to both concave and convex spherical surfaces ofsocket 26 andprotrusion 23. The space betweensocket 27 andprotrusion 24 is filled with an elastomeric layer/laminate 29 of uniform thickness, attached (bonded, glued, etc.) to both concave and convex spherical surfaces ofsocket 27 andprotrusion 24. -
FIG. 8 shows an embodiment of the proposed prosthesis similar to the embodiment shown inFIG. 6 wherein the spherical joint is preloaded (and held captive) by means of preloading member 20 (a bolt is shown but other known designs of preloading elements can be employed). The preloadingelement 20 is attached tolower base 11 a andtop base 12 a, but does not have a contact withintermediate element 15 a. The artificial disc can be preloaded with a specified load before insertion into the spinal column, resulting in modification of the axial stiffness. - A similar preloading system can be applied to the embodiment shown in
FIG. 7 . - It is readily apparent that the components of the artificial intervertebral disc disclosed herein may take a variety of configurations. Thus, the embodiments and exemplifications shown and described herein are meant for illustrative purposes only and are not intended to limit the scope of the present invention, the true scope of which is limited solely by the claims appended thereto.
Claims (6)
Priority Applications (1)
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US11/759,609 US20070299524A1 (en) | 2004-01-13 | 2007-06-07 | Artificial intervertebral disc |
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US53574104P | 2004-01-13 | 2004-01-13 | |
US11/037,629 US7235103B2 (en) | 2004-01-13 | 2005-01-12 | Artificial intervertebral disc |
US11/759,609 US20070299524A1 (en) | 2004-01-13 | 2007-06-07 | Artificial intervertebral disc |
Related Parent Applications (1)
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US11/037,629 Division US7235103B2 (en) | 2004-01-13 | 2005-01-12 | Artificial intervertebral disc |
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US20070299524A1 true US20070299524A1 (en) | 2007-12-27 |
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US11/759,609 Abandoned US20070299524A1 (en) | 2004-01-13 | 2007-06-07 | Artificial intervertebral disc |
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US11/037,629 Expired - Fee Related US7235103B2 (en) | 2004-01-13 | 2005-01-12 | Artificial intervertebral disc |
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US20050154468A1 (en) | 2005-07-14 |
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