| http://www.w3.org/ns/prov#value | - a generally annular chamber between said needle means and sleeve means, for introducing a fluid into the surgical site; and means, defined by structure on said needle means, for inhibiting formation of bubbles and microbubbles resulting from cavitation, in the annular chamber, of the fluid introduced into the surgical site, said structure including a shoulder disposed at the needle proximal end, s
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