Double lumen phacoemulsification needle tip
A phacoemulsifcation needle has a central aspiration passageway extending through a needle body. A hollow shell is attached to and covers at least a portion of the needle body, creating an annular space between the inner surface of the shell and the outer surface of the needle body. At least one port is formed through the needle body communicating between the aspiration passageway and the annular space to create a flow path. The openings to the needle body and the shell may be coplanar or may lie in different planes.
1. A phacoemulsification needle for aspirating liquid and tissue particles from a surgical site, said needle comprising:
a needle body having a distal end and a proximal end,
said needle body having a central bore,
said bore having a central axis,
said needle body terminating at a needle body lip,
said needle body lip defining a needle body mouth communicating with said bore;
a bell-shaped hollow shell having first and second ends,
said second end attached fluid-tightly to said needle body at a juncture,
said shell flaring outward from said needle body from said second end toward said first end,
said first end terminating at a shell lip,
said shell lip defining a shell mouth,
said shell and said needle body defining therebetween an annular flow space for aspirating liquid from said surgical site;
at least one port formed through said needle body intermediate said needle body lip and said juncture, whereby said annular space communicates with said bore by way of said at least one port,
said bore, said annular flow space, said shell mouth and said needle body mouth defining a flow path for aspirating liquid and tissue particles from said surgical site,
said shell lip and said needle body lip defining first and second cutting surfaces configured to emulsify tissue.
2. The apparatus as recited in claim 1 wherein said needle body lip and said shell lip are substantially coplanar.
3. The apparatus as recited in claim 1 wherein said needle body lip and said shell lip lie in different planes.
4. The apparatus as recited in claim 1 wherein said needle body lip extends past said shell lip.
5. The apparatus as recited in claim 1 wherein said needle has two said ports.
6. The apparatus as recited in claim 1 wherein said shell has a central shell axis, said shell axis being angled with respect to said needle body axis.