WO2004064692A2 - Articulating spinal disc prosthesis - Google Patents
Articulating spinal disc prosthesis Download PDFInfo
- Publication number
- WO2004064692A2 WO2004064692A2 PCT/GB2004/000082 GB2004000082W WO2004064692A2 WO 2004064692 A2 WO2004064692 A2 WO 2004064692A2 GB 2004000082 W GB2004000082 W GB 2004000082W WO 2004064692 A2 WO2004064692 A2 WO 2004064692A2
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- WIPO (PCT)
- Prior art keywords
- prosthesis
- prosthesis according
- bearing surface
- members
- tool
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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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- 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
- A61F2/46—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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- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
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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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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/30782—Apertures or holes, e.g. of circular cross section inclined obliquely
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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
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- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/3079—Stepped or enlarged apertures, e.g. having discrete diameter changes
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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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
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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
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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
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- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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Definitions
- the present invention relates to a prosthetic spinal disc, and more specifically, to a prosthetic spinal disc which articulates, permitting translational and rotational motion.
- Corrective measures taken to ensure the correct spacing of the vertebrate formerly separated by the removed or damaged disc can include fusion or, where it is desirous to maintain spinal movement and articulation, spinal disc replacement using disc prostheses.
- spinal fusion the vertebrae above and below the damaged disc or disc space are fused together using transplanted bone tissue, other artificial fusion elements or by mechanical means.
- Spinal fusion however prevents the fused vertebrae from moving with respect to each other and this is causing increasing concern in the spinal medical community, in that the biomechanical rigidity of the fused vertebrae may lead to rapid deterioration of the adjacent spinal motion segments. Consequently, many patients may require additional disc removal and/or fusion procedures due to further degeneration being promoted by the initial spinal fusion.
- prosthetic intervertebral discs have long been used as a substitute for chronically injured or ruptured intervertebral discs in the spinal columns of humans .
- Such devices employ one, two, three or more individual elements having a wide range of constructions including ball and socket joints, gel-filled enclosures, sp'ring-biased plates and/or the like.
- US patent 5,556,431 discloses a three-piece prosthesis in which two plates, each having a hollow on one side, are fixed to adjacent vertebrae so that the two hollows face each other across the disc space.
- the third element is a core having a rounded surface on each side that fits into the hollows in the two plates .
- US patent 5,674,296 discloses a prosthesis having two L-shaped members, each having curved sections between which a resilient disc body is placed.
- US patent 5,755,796 discloses a prosthesis for implantation in the disc space between adjacent vertebrae.
- the prosthesis has two elements, one being attached to the vertebra above the disc space and the other being attached to the vertebra below the disc space.
- the lower element includes a hollow box frame with a spherical seat and the upper element includes a spherically- shaped head that fits into the spherical seat.
- US Patent 5,782,832 discloses an implant having two plate members anchored to adjacent vertebrae within the disc space, the upper plate member having a rounded convex underside and the lower plate member having a concave top side to engage the underside of the upper plate member to allow rotation.
- prosthetic disc designs which allow articulation in a rotational sense are also known. They are generally designed to approximate the articulation and behaviour of a normal spinal disc.
- a recent US Patent Application 98/22436 discloses an intervertebral joint prosthesis having a ball component for engagement with a first vertebra and a trough component for engagement with a second vertebra.
- the trough component is described as including "a generally concave surface having a substantially flat portion".
- this prosthesis allows anteroposterior translation and rotation, and thereby facilitates articulation of the disc.
- the translation movement which is achieved by the inclusion of what is described as " substantially flat portion" in the generally concave surface of the trough component is effectively unrestrained in so far as the convex portion of the ball component is allowed to freely translate along the concavity of the trough component.
- This free translation is promoted and further assisted, by gravitational forces during flexion, due to the trough component tilting downwardly toward its anterior end. It is claimed that during flexion the ball component will travel along the feature described as a "substantially flat portion".
- the axis of rotation for any two adjacent vertebrae is unique and during flexion or extension will shift, or translate in varying ways and to varying degrees.
- the cervical joints C1 /C2 and C2/C3 in flexion will move and translate in a different way and at a different angle to joints C4/C5, C5/C6 or C6/C7.
- lumbar joints will move in a different direction and at a different angle to cervical joints.
- lumbar joints L1 /L2 will tend to translate at a different angle and direction to lumbar joints L5 /S 1.
- Recent observations indicate that there may be a need to restrict and control the lateral movement of spinal disc replacement joints so as to more closely resemble the side-to- side motion possible with natural spinal disc tissue. Further observations also indicate that it would be beneficial to the patient if the degree of flexion permitted by the prosthesis was reduced, when flexion is combined with and during rotation.
- an articulating spinal disc prosthesis said prosthesis including a first member for engagement with an inferior surface of a first vertebra in use and a second member for engagement with a superior surface of a second vertebra in use, said first member having a vertebra contacting surface and a convex bearing surface provided on an opposite surface thereof, said second member having a vertebra contacting surface and a concave bearing surface provided on an opposite surface thereof, the convex bearing surface of the first member engaging with the concave bearing surface of the second member in use, and wherein the concave bearing surface of the second member includes an inclined ramp.
- first and/or second members are in the form of plate like members. These plate like members are relatively thin and when engaged together are typically of an equivalent size to a normal disc.
- the first and/or second members further include an anterior facing surface, a posterior facing surface, a first lateral surface and a second lateral surface.
- the inclined ramp is provided on the side of the second member nearest to the anterior surface.
- the inclined ramp in transverse perpendicular cross section, typically takes the form of a radius.
- the inclined ramp makes the concave bearing surface of the second member, at least in part, asymmetrical about the anterior to posterior axis thereof.
- the convex bearing surface engages and cooperates with the concave bearing surface and ramp, thereby permitting rotation and inclined translation with respect to each other.
- the degree of inclined translation is dictated by the angular presentation of the ramp.
- the chosen angle of inclination of the ramp will be influences by the positioning of the prosthetic disc in the spine (i.e. the angle will be preselected to more accurately mimic natural spinal movement applicable to the site of the prosthetic spinal disc insertion).
- the ramp is typically linear or planar in form and is provided at an angle different to the angle of the remaining surfaces of the concave portion.
- the inclination of the ramp is sufficient to allow inclined translation of the second member with respect to the first member in a controlled manner which closely resembles normal movement of the motion segment, particularly taking into account the physiological movement of the facet joints posteriorly.
- the present invention provides an articulating spinal disc prosthesis which comprises a first upper plate member for engagement with the inferior surface of a first vertebra and a second lower plate member for engagement with the superior surface of a second vertebra, wherein the said upper plate has a vertebra contacting surface, an opposite convex bearing surface, an anterior facing side, a posterior facing side, a first lateral side and a second lateral side.
- the said lower plate has a vertebra contacting surface, an opposite concave bearing surface, an anterior facing side, a posterior facing side, a first lateral side and a second lateral side.
- the concave bearing surface of the lower plate includes, on the side nearest to the anterior facing side, an inclined ramp, which, in transverse perpendicular cross-section, takes the form of a radius.
- the angle of inclination of the ramp is typically measured in relation to the median plane of the prosthetic joint, the median plane of the joint being substantially parallel to the axial plane.
- the angle of inclination of the ramp falls within the range 5° to 60°, further preferably within the range 10° to 45°, most preferably within the range 15° to 30° and ideally within the range 20° to 25°.
- the convex bearing surface of the first member can be in the form of a substantially spherical ball, dome or hemisphere.
- the substantially concave bearing surface of the second member is substantially spherical in shape towards the posterior side or on the side opposite to the inclined ramp.
- the inclined ramp is typically provided towards the anterior side of the second member when the first and second members are in position and engaging with their respective adjacent vertebra.
- the said convex bearing surface of the first member can be in the form of a substantially aspherical ball, dome or hemisphere.
- the radius of the ball dome or hemisphere in the coronal and axial planes is typically greater than the radius in the sagittal plane.
- the substantially concave bearing surface of the second member is substantially aspherical in shape towards the posterior side or the side opposite to the inclined ramp.
- the inclined ramp is typically provided towards the anterior side of the second member, when the first and second members are in position and engaging with their respective adjacent vertebra.
- the said substantially aspheric bearing surface typically has a radius that is greater in the coronal and axial planes than in the sagittal plane.
- the said vertebra contacting surface of the first member is substantially flat.
- the said vertebra contacting surface of the first member can include a pronounced hemispherical or aspherical dome.
- the dome can be positioned in a location of the inferior vertebra contacting surface that closely aligns with the pronounced hollows or concavities of the lumbar vertebrae.
- vertebra contacting surface of the second member can also include a pronounced hemispherical or aspherical dome.
- the first and/or second members can also include engaging means for engaging with an insertion tool.
- the means can be in the form of one or more open slots, apertures and/or channels.
- the engaging means are positioned towards the lateral sides of the said vertebra contacting surfaces.
- said open slots are positioned so as to permit insertion of a specialised tool, the tool being inserted from above and below the first and second members in a sandwich action.
- the engaging means are typically provided at corresponding and generally parallel locations on the first and second members.
- the engaging means can be provided across substantially the whole surface of the first and/or second members or on a part thereof.
- engaging means of the first and second members include one or more holes or apertures
- the engaging means are positioned on the anterior sides of the said first and second members and further preferably are displaced towards the lateral sides of the said members.
- the said holes are positioned so as to permit insertion of a specialised tool, the tool being inserted from the anterior side of the first and second members.
- Both the first and/or second members can include attachment means for engaging with their respective adjacent vertebrae.
- the attachment means include one or more pins, spikes, screws, substantially perpendicular fins and/or the like.
- a tool for use in implanting the disc prosthesis according to the present invention.
- the tool typically includes a handle portion and a prosthesis engaging portion having means to releasably engage or hold one or more parts of the prosthesis.
- the prosthesis engaging portion typically engages with the engaging means of the first and/or second members.
- the handle portion is elongate and further preferably the prosthesis engaging portion means include one or more spindles or arms.
- the invention also contemplates a tool for use in implanting an intervertebral joint prosthesis, said tool having a handle portion and a prosthesis-engaging portion having elements that hold the one or more parts of the said intervertebral joint prosthesis.
- the prosthesis-engaging portion consists of elements in the form of slender spindles which engage with engaging means, typically grooves or channels, above and below the said joint prosthesis, provided in the vertebrae contacting services for the purpose of spinal disc implantation.
- the prosthesis-engaging portion typically consists of elements in the form of slender spindles which engage with engaging means, typically in the form of holes in the anterior sides of the said joint prosthesis, provided for the purpose of spinal disc implantation.
- the present invention provides an articulating spinal disc prosthesis, and tools for implantation, which allows as near normal a range of articulations between the two adjacent vertebrae, to which the prosthesis has been secured.
- FIG 1 is part-sectional view, showing one embodiment of the prosthesis of the present invention in place between adjacent spinal vertebrae, the view being in the Sagittal plane.
- FIG 2 shows a first preferred embodiment of the prosthesis.
- FIG2a is a side elevation view; FIG2b is a plan view and FIG 2c is a perspective view of the same prosthesis.
- FIG 3a is a side elevation of a first upper plate member of the prosthesis shown in FIG 2;
- FIG 3b is an underside view of the same upper plate.
- FIG 4 shows a front elevation, plan and a sectioned side elevation of a second lower plate member of the prosthesis shown in FIG 2.
- FIG 5 is a side elevation view of a second preferred embodiment of the prosthesis of the present invention.
- FIG 6a is side elevation view of the Upper Pate of the prosthesis shown in FIG 5;
- FIG 6b is an elevation looking from the front or anterior side and FIG 6c is an elevation looking on the underside of the same
- FIG 7a is a plan view of the Lower Plate of the prosthesis shown in FIG5;
- FIG 7b is an elevation looking from the front or anterior side;
- FIG 7c is a sectioned side elevation looking from the front or anterior side;
- FIG 7c is a sectioned side elevation and
- FIG 7d is a perspective view of the same Lower Plate of the prosthesis shown in FIG5;
- FIG 8 shows a side elevation, with top and underside views, of the Upper Pate of yet a further embodiment of the prosthesis of the present invention.
- FIG 9 shows several views of an insertion tool for use in the insertion of a number of embodiments of the prosthesis of the present invention
- FIG 9a being a first side elevation
- FIG 9b being a second side elevation
- FIG 9c being an end elevation (with prosthetic disc in engagement)
- FIG 9d being a perspective view (with prosthetic disc in engagement)
- FIG 10 shows several views of an insertion tool for use in the insertion of further embodiments of the prosthesis of the present invention
- FIG 10a being a first side elevation
- FIG 10b being a second side elevation
- FIG 10c being an end elevation (with prosthetic disc in engagement)
- FIG l Od being a perspective view (with prosthetic disc in engagement) .
- Prosthesis 10 includes a first upper plate member 20 and a second lower plate member 30.
- Upper plate 20 includes s vertebra contacting surface 21 , an opposite surface 22, and anterior facing side 23, a posterior facing side 24, a first lateral side 25 and a second lateral side 26.
- Lower plate 30 includes a vertebra contacting surface 31 , an opposite surface 32, and anterior facing side 33, a posterior facing side 34, a first lateral side 35 and a second lateral side 36.
- upper plate 20 is fixed to the upper adjacent vertebra 14 and lower plate 30 is fixed to the lower adjacent vertebra 16 so that the two plates 20 & 30 align with an engage each other.
- upper plate 20 includes a substantially flat vertebra contacting surface 21 and an opposite surface 22 that includes a substantially convex surface 27 for engagement with lower plate 30.
- Lower plate 30 includes a substantially flat vertebra contacting surface 31 and an opposite surface 32, which includes a substantially concave surface 37 for engagement with the convex surface 27 of upper plate 20.
- the substantially concave surface 37 of lower plate 30 comprises a spherical surface 38 and an inclined ramp 39.
- the inclined ramp 39 is positioned so that plane 40 of the ramp is at angle alpha, relative to the median plane 41 of the prosthesis.
- the angle alpha is selected to suit individual patients and is only determined, once the intended position of the prosthesis 10 in the spinal column has been established; but the ramp angle alpha will typically fall within the range 5° to 60°
- angled surfaces 28 and 42, on the upper plate 20 and the lower plate 30 respectively allow the upper and lower plates to be secured to the adjacent vertebrae.
- This angled surface is typically provided along a peripheral edge of the bearing surfaces of the plates 20, 30 and further preferably adjacent anterior surfaces thereof.
- the surfaces 28, 42 provide necessary clearance for the insertion of fixing screws 43 (not shown), as well as clearance for the blade element of a screw driving tool.
- the fixing screws would be inserted through opening 42 and can be used for initial stabilisation of the prosthesis/implant.
- Screw 43 could also be a headed pin or a perpendicular keel (perpendicular to the lower and upper plates respectively) .
- Vertebrae attachment means in the form of projections 44 assist in retaining the prosthesis in position in the intervertebral disc space 12. Projections 44 engage with adjacent vertebrae.
- the upper plate 50 includes a convex surface 51 that is substantially aspherical in shape and the lower plate 60 includes a concave surface 61 that comprises a substantially aspherical surface 62 and an inclined ramp 63.
- the geometry of the aspherical surfaces 51 & 62 can be more readily appreciated by reference to accompanying FIG 6 wherein the radius of the said substantially aspherical surface 51 is greater in the Coronal plane (FIG 6b) and also in the Axial plane (FIG 6c) than is the case in the Sagittal plane (FIG 6a) ; similarly the radius of the said aspherical surface 62 (shown in FIG 7) is greater in the Coronal plane (FIG 7b) and also in the axial plane (FIG 7a) than is the case in the Sagittal plane (FIG
- the upper plate 70 includes a vertebra contacting surface 71 and a pronounced dome 72, the dome 72 being positioned in a location of the vertebra contacting surface 71 so as to align with the main hollow in the inferior surface of a normally developed lumbar vertebra.
- the position of this dome may vary in the anterior- posterior plane.
- the upper plate 20 and lower pate 30 of the prosthesis are provided with engaging means in the form of open slots or channels 73 (FIG 2) in the vertebrae contacting surfaces to facilitate the engagement of prosthesis engaging elements of an insertion tool during the process of insertion of the prosthesis into the spinal column.
- engaging means in the form of open slots or channels 73 (FIG 2) in the vertebrae contacting surfaces to facilitate the engagement of prosthesis engaging elements of an insertion tool during the process of insertion of the prosthesis into the spinal column.
- engaging means in the form of holes 74 are provided in the anterior side of the upper and lower plates of the prosthesis, the holes being used to facilitate the engagement of prosthesis engaging elements of an insertion tool during the process of insertion of the prosthesis into the spinal column.
- FIGS 9 & 10 Tools used for insertion of prosthetic spinal discs are shown at FIGS 9 & 10.
- FIG 9 shows several views of a tool for use during the insertion of a spinal disc prosthesis into the cervical region of the spine.
- the tool is movable between open and closed positions and in the closed position, prosthesis engaging portions are located above and below the two-part prosthesis, engaging into the slots provided in the vertebrae contacting surfaces of the upper and lower plates of the implant.
- FIG 10 shows several views of a tool for use during the insertion of a two-part spinal disc prosthesis into the lumbar region of the spine.
- the disc-engaging elements of the tool are inserted into holes provided in the anterior facing sides of the upper and lower plates that comprise the implant.
- the prosthesis engaging portions include arm members or spindles in either embodiment.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Transplantation (AREA)
- Neurology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Prostheses (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
Claims
Priority Applications (3)
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EP04702362A EP1587461B1 (en) | 2003-01-17 | 2004-01-15 | Articulating spinal disc prosthesis |
DE602004012960T DE602004012960T2 (en) | 2003-01-17 | 2004-01-15 | ROLLED WINDROW PROTECTION |
US10/542,292 US20060259147A1 (en) | 2003-01-17 | 2004-01-15 | Articulating spinal disc prosthesis |
Applications Claiming Priority (2)
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GBGB0301085.7A GB0301085D0 (en) | 2003-01-17 | 2003-01-17 | Articulating spinal disc prosthesis |
GB0301085.7 | 2003-01-17 |
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WO2004064692A2 true WO2004064692A2 (en) | 2004-08-05 |
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PCT/GB2004/000082 WO2004064692A2 (en) | 2003-01-17 | 2004-01-15 | Articulating spinal disc prosthesis |
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US (1) | US20060259147A1 (en) |
EP (1) | EP1587461B1 (en) |
AT (1) | ATE391474T1 (en) |
DE (1) | DE602004012960T2 (en) |
ES (1) | ES2303045T3 (en) |
GB (1) | GB0301085D0 (en) |
WO (1) | WO2004064692A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1587461B1 (en) | 2008-04-09 |
DE602004012960T2 (en) | 2009-06-04 |
WO2004064692A3 (en) | 2004-10-07 |
DE602004012960D1 (en) | 2008-05-21 |
EP1587461A2 (en) | 2005-10-26 |
ES2303045T3 (en) | 2008-08-01 |
GB0301085D0 (en) | 2003-02-19 |
US20060259147A1 (en) | 2006-11-16 |
ATE391474T1 (en) | 2008-04-15 |
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