Surgical instruments and assemblies
CA 2001302 C · Owner: Smiths Industries Public Limited Company · Inventors: Lester, Graham George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tracheostomies can be formed by means of a hollow needle inserted through a scalpel cut into the trachea. In the present invention the needle has a sharply pointed, tip and is joined at its rear end to a plastics hub. The length of the needle from the hub is greater than the thickness of neck tissue but less than the distance between the skin surface and the posterior wall of the trachea. The hub has a laterally extending face which has an area at least fifty times the cross sectional area of the needle. Two parallel walls with stepped edges provide a gripping region far the hub, enabling it to be gripped between the finger and thumb. The needle is inserted by means of a loss of resistance …
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 24, 1989 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2011.
- 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.