WO2017190160A1 - Cervical disc - Google Patents

Cervical disc Download PDF

Info

Publication number
WO2017190160A1
WO2017190160A1 PCT/ZA2016/050013 ZA2016050013W WO2017190160A1 WO 2017190160 A1 WO2017190160 A1 WO 2017190160A1 ZA 2016050013 W ZA2016050013 W ZA 2016050013W WO 2017190160 A1 WO2017190160 A1 WO 2017190160A1
Authority
WO
WIPO (PCT)
Prior art keywords
interface
endplate
annulus
concave
circular
Prior art date
Application number
PCT/ZA2016/050013
Other languages
French (fr)
Inventor
John James O'TOOLE
Original Assignee
Elite Surgical Supplies (Pty) Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to ZA2014/03893A priority Critical patent/ZA201403893B/en
Application filed by Elite Surgical Supplies (Pty) Ltd filed Critical Elite Surgical Supplies (Pty) Ltd
Priority to PCT/ZA2016/050013 priority patent/WO2017190160A1/en
Publication of WO2017190160A1 publication Critical patent/WO2017190160A1/en

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
    • A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/3065—Details of the ball-shaped head
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/30662—Ball-and-socket joints with rotation-limiting means
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/30665—Dual arrangement of two adjacent ball-and-socket joints
    • 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
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis

Definitions

  • This invention relates to a cervical disc.
  • the inventor is aware of the use of cervical interbody fusion cages.
  • the cage replaces a cervical disk between vertebrae and a cervical plate is screwed to the cage and the vertebrae above and below the cage to fuse the upper and lower vertebrae together.
  • the disk is replaced with a type of metal joint which allows mobility in the spine at the disc replacement.
  • the joint typically includes a ball and socket and the ball is often of a resiliently deformable material to absorb shock. It is an object of the invention to provide a cervical disc replacement, which, when implanted, securely allows increased lateral and rotational movement of the spine.
  • a cervical disc replacement which disc includes:
  • a first endplate having, on its inner surface, a matching convex interface for engaging one concave interface of the annulus, which interface has a larger surface than that of the convex interface and a circular ridge protruding from the inner surface and surrounding the convex interface;
  • a second endplate having, on its inner surface, a matching convex interface for engaging the other concave interface of the annulus, which interface has a larger surface than that of the concave interface and a circular channel surrounding the convex interface for accommodating the circular ridge of the first endplate;
  • outer surfaces of the endplates are provided with serrated protrusions for engaging, in use, with its opposed vertebral bodies.
  • the double concave configuration allows rotation and pivot movement and is self-centring.
  • the annulus is contained within the opposed endplates preventing excessive movement and escape of the annulus.
  • the end plates may be manufactured from surgically accepted metal or preferably manufactured from Polyether ether ketone (PEEK).
  • PEEK Polyether ether ketone
  • the outer surfaces may preferably be titanium plasma coated to improve bone adhesion.
  • the annulus may also be manufactured from PEEK or ceramic.
  • Figure 1 shows a perspective view of a cervical disc replacement, in accordance with the invention
  • Figure 2 shows an exploded perspective view of the cervical disc replacement
  • Figure 3 shows a cross sectional view with the cervical disk replacement in the rest position
  • Figure 4 shows a cross sectional view with the cervical disk replacement in the a tilted position
  • Figure 5 shows orthogonal views of the assembled cervical disc replacement
  • Figure 6 shows orthogonal exploded views of the cervical disc replacement
  • Figure 7 shows orthogonal views of the annulus
  • Figure 8 shows orthogonal views of the superior end plate
  • Figure 9 shows orthogonal views of the inferior endplate.
  • the cervical disc replacement in accordance with the invention, is generally indicated by reference numeral 10.
  • the cervical disc replacement 10 includes a circular disc shaped annulus 12, a first endplate 14, inferior in this case and a second endplate 16, anterior in this case.
  • the circular disc shaped annulus 12 has opposed concave interface surfaces 18.1 and 18.2.
  • the first endplate 14 has, on its inner surface, a matching convex interface 20 for engaging one concave interface 18.2 of the annulus, which interface has a larger surface than that of the concave interface and a circular ridge 21 protruding from the inner surface and surrounding the convex interface.
  • the second endplate 16 has on its inner surface, a matching convex interface 22 for engaging the other concave interface 18.1 of the annulus, which interface has a larger surface than that of the concave interface and a circular channel 23 for accommodating the circular ridge 21 of the first endplate.
  • the outer surfaces 24 of the endplates are provides with serrated protrusions for engaging, in use, with its opposed vertebral bodies.
  • the end plates 14 and 16 are manufactured from PEEK and the outer surfaces 24 are titanium plasma coated to improve bone adhesion.
  • the annulus 12 is also manufactured from PEEK.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (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)
  • Prostheses (AREA)

Abstract

The invention provides a cervical disc replacement. The disc includes a circular disc shaped annulus, a first endplate, and a second endplate. The circular disc shaped annulus has opposed concave interface surfaces. The first endplate has, on its inner surface, a matching convex interface for engaging one concave interface of the annulus, which interface has a larger surface than that of the convex interface and a circular ridge protruding from the inner surface and surrounding the convex interface. The second endplate has, on its inner surface, a matching convex interface for engaging the other concave interface of the annulus, which interface has a larger surface than that of the concave interface and a circular channel surrounding the convex interface for accommodating the circular ridge of the first endplate.

Description

Title: Cervical Disc
Technical field of the invention
This invention relates to a cervical disc.
Background to the invention The inventor is aware of the use of cervical interbody fusion cages. The cage replaces a cervical disk between vertebrae and a cervical plate is screwed to the cage and the vertebrae above and below the cage to fuse the upper and lower vertebrae together. In an alternative procedure, the disk is replaced with a type of metal joint which allows mobility in the spine at the disc replacement. The joint typically includes a ball and socket and the ball is often of a resiliently deformable material to absorb shock. It is an object of the invention to provide a cervical disc replacement, which, when implanted, securely allows increased lateral and rotational movement of the spine.
General description of the invention
According to the invention there is provided a cervical disc replacement, which disc includes:
a circular disc shaped annulus having opposed concave interface surfaces;
a first endplate having, on its inner surface, a matching convex interface for engaging one concave interface of the annulus, which interface has a larger surface than that of the convex interface and a circular ridge protruding from the inner surface and surrounding the convex interface; a second endplate having, on its inner surface, a matching convex interface for engaging the other concave interface of the annulus, which interface has a larger surface than that of the concave interface and a circular channel surrounding the convex interface for accommodating the circular ridge of the first endplate; and
wherein the outer surfaces of the endplates are provided with serrated protrusions for engaging, in use, with its opposed vertebral bodies.
The double concave configuration allows rotation and pivot movement and is self-centring. The annulus is contained within the opposed endplates preventing excessive movement and escape of the annulus.
The end plates may be manufactured from surgically accepted metal or preferably manufactured from Polyether ether ketone (PEEK). In the case of PEEK, the outer surfaces may preferably be titanium plasma coated to improve bone adhesion. The annulus may also be manufactured from PEEK or ceramic.
Detailed description of the invention
The invention is now described by way of example with reference to the accompanying drawings.
In the drawings:
Figure 1 shows a perspective view of a cervical disc replacement, in accordance with the invention;
Figure 2 shows an exploded perspective view of the cervical disc replacement; Figure 3 shows a cross sectional view with the cervical disk replacement in the rest position;
Figure 4 shows a cross sectional view with the cervical disk replacement in the a tilted position;
Figure 5 shows orthogonal views of the assembled cervical disc replacement; Figure 6 shows orthogonal exploded views of the cervical disc replacement;
Figure 7 shows orthogonal views of the annulus; Figure 8 shows orthogonal views of the superior end plate; and
Figure 9 shows orthogonal views of the inferior endplate.
Referring now to the drawings, the cervical disc replacement, in accordance with the invention, is generally indicated by reference numeral 10.
The cervical disc replacement 10 includes a circular disc shaped annulus 12, a first endplate 14, inferior in this case and a second endplate 16, anterior in this case. The circular disc shaped annulus 12 has opposed concave interface surfaces 18.1 and 18.2. The first endplate 14 has, on its inner surface, a matching convex interface 20 for engaging one concave interface 18.2 of the annulus, which interface has a larger surface than that of the concave interface and a circular ridge 21 protruding from the inner surface and surrounding the convex interface. The second endplate 16, has on its inner surface, a matching convex interface 22 for engaging the other concave interface 18.1 of the annulus, which interface has a larger surface than that of the concave interface and a circular channel 23 for accommodating the circular ridge 21 of the first endplate. The outer surfaces 24 of the endplates are provides with serrated protrusions for engaging, in use, with its opposed vertebral bodies. The end plates 14 and 16are manufactured from PEEK and the outer surfaces 24 are titanium plasma coated to improve bone adhesion. The annulus 12 is also manufactured from PEEK.
It shall be understood that the example is provided for illustrating the invention further and to assist a person skilled in the art with understanding the invention and is not meant to be construed as unduly limiting the reasonable scope of the invention.

Claims

Claims
1 . A cervical disc replacement, which disc includes:
a circular disc shaped annulus having opposed concave interface surfaces;
a first endplate having, on its inner surface, a matching convex interface for engaging one concave interface of the annulus, which interface has a larger surface than that of the convex interface and a circular ridge protruding from the inner surface and surrounding the convex interface;
a second endplate having, on its inner surface, a matching convex interface for engaging the other concave interface of the annulus, which interface has a larger surface than that of the concave interface and a circular channel surrounding the convex interface for accommodating the circular ridge of the first endplate; and
wherein the outer surfaces of the endplates are provides with serrated protrusions for engaging, in use, with its opposed vertebral bodies.
PCT/ZA2016/050013 2016-04-26 2016-04-26 Cervical disc WO2017190160A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA2014/03893A ZA201403893B (en) 2016-04-26 2014-05-28 Cervical disc
PCT/ZA2016/050013 WO2017190160A1 (en) 2016-04-26 2016-04-26 Cervical disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ZA2016/050013 WO2017190160A1 (en) 2016-04-26 2016-04-26 Cervical disc

Publications (1)

Publication Number Publication Date
WO2017190160A1 true WO2017190160A1 (en) 2017-11-02

Family

ID=57045433

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2016/050013 WO2017190160A1 (en) 2016-04-26 2016-04-26 Cervical disc

Country Status (2)

Country Link
WO (1) WO2017190160A1 (en)
ZA (1) ZA201403893B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD239523A1 (en) * 1985-07-19 1986-10-01 Univ Berlin Humboldt intervertebral disc prosthesis
WO2005053580A1 (en) * 2003-11-28 2005-06-16 Richard Mervyn Walker An intervertebral prosthesis
US20070233262A1 (en) * 2006-03-31 2007-10-04 Uri Arnin Articulating spinal prosthesis
US20080065221A1 (en) * 2003-05-02 2008-03-13 Neville Alleyne Artificial spinal disk
WO2008094260A2 (en) * 2007-01-30 2008-08-07 Llc Spinal Concentric interior insert ball and dual socket joint
EP2716262A1 (en) * 2012-10-08 2014-04-09 Medicrea International Intervertebral disc prosthesis

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD239523A1 (en) * 1985-07-19 1986-10-01 Univ Berlin Humboldt intervertebral disc prosthesis
US20080065221A1 (en) * 2003-05-02 2008-03-13 Neville Alleyne Artificial spinal disk
WO2005053580A1 (en) * 2003-11-28 2005-06-16 Richard Mervyn Walker An intervertebral prosthesis
US20070233262A1 (en) * 2006-03-31 2007-10-04 Uri Arnin Articulating spinal prosthesis
WO2008094260A2 (en) * 2007-01-30 2008-08-07 Llc Spinal Concentric interior insert ball and dual socket joint
EP2716262A1 (en) * 2012-10-08 2014-04-09 Medicrea International Intervertebral disc prosthesis

Also Published As

Publication number Publication date
ZA201403893B (en) 2017-08-30

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