Patent ID: 8343106

Claim:
A trocar cannula device, comprising: a trocar cannula having a seal; a vent cannula, comprising: a lower cylindrical portion; a cylindrical rim extending from the lower cylindrical portion; a flexible, cylindrical sleeve coupled to the rim; wherein the lower cylindrical portion comprises a first outer diameter proximal to the cylindrical rim and a second outer diameter on the lower cylindrical portion distal from the cylindrical rim and wherein the first outer diameter is greater than the second outer diameter; wherein the vent cannula is configured to slide into the seal of the trocar cannula to open the seal to allow fluid to vent through the trocar cannula and out of an eye, wherein the rim is configured to prevent the vent cannula from slipping completely into the trocar cannula; wherein the rim comprises a tube portion and wherein the sleeve frictionally engages the tube portion, and wherein the sleeve frictionally engages the tube portion along more than half of the length of the sleeve.