| http://www.w3.org/ns/prov#value | - This may be particularly advantageous when implanting the cannula with an introducer device that can only be used to introduce objects with a limited outer diameter.In some embodiments, the marker is provided while maintaining a smooth cannula surface that is free or substantially free of sharp edges, roughness, or other features that would promote haemolysis, thrombus and potential damage to the
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