Prosthetic spinal disc nucleus
CA 2201607 C · Owner: Ledoux, Philip J. · Inventors: Dickhudt, Eugene A.; Ledoux, Philip J.; Ray, Charles D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An elongated, pillow, shaped prosthetic spinal disc nucleus body (10) for, implantation into a human intervertebral spinal disc (32), made of a hydrogel core (12) and a flexible constraining jacket, (14) surrounding the hydrogel material core (12) that permits, the hydrogel core (12) to expand and contract. The hydrogel core, (12) has a length approximating the sagittal diameter of a nucleus, of the human disc a width less, than the length, and a height less than the length or width. The hydrogel core will expand (See fig. I) and contract in a desired fashion, as it imbibes and expels fluids in response to various loads, placed upon the spinal tract. The constraining jacket (14) is porous …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 17, 1995 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2017.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.