초록 ▼

A hand-held cannula assembly for irrigating and aspirating opthalmic surgical sites includes as irrigation cannula circumscribed about an aspiration cannula and extending out through the forward end of the assembly from a reservoir for the irrigation fluid in the handle. Pressurized irrigation fluid

A hand-held cannula assembly for irrigating and aspirating opthalmic surgical sites includes as irrigation cannula circumscribed about an aspiration cannula and extending out through the forward end of the assembly from a reservoir for the irrigation fluid in the handle. Pressurized irrigation fluid is supplied to the reservoir through the rearward end of the handle and flows through openings in the irrigation cannula periphery into an annular flow passage between the two cannulas. An opening in the irrigation cannula issues the irrigation fluid at the surgical site. Aspiration fluid is drawn into the aspiration cannula which extends through the handle interior to an outflow opening at the rearward handle end. The irrigation/aspiration tip exterior is made to be smooth, protrusionless, unitary and one-piece in design to afford a minimum in tissue tearing at the surgical site, while also allowing improved irrigation fluid flow a the site.

대표청구항 ▼

An improved apparatus for supplying fluid to and withdrawing fluid from a surgical site, said apparatus comprising: a handle member having distal and proximal ends, an intermediate body section, and a bore therethrough; a nose chamber means having a proximal end in fluid communication with the dista

An improved apparatus for supplying fluid to and withdrawing fluid from a surgical site, said apparatus comprising: a handle member having distal and proximal ends, an intermediate body section, and a bore therethrough; a nose chamber means having a proximal end in fluid communication with the distal end of the handle member, an enclosed hollow interior means forming an irrigation fluid reservoir substantially across the interior cross-sectional width and through a substantial portion of the longitudinal length of the nose chamber means, and a distal end extending outwardly from the distal end of the handle member; a surgical tip means having a housing defining a hollow interior of smaller cross-sectional width than the hollow interior means of the nose chamber means in fluid communication with the reservoir of the nose chamber, a proximal end open for direct, unobstructed fluid communication with the fluid reservoir at the distal end of the nose chamber means, and a distal end extended away from the distal end of the nose chamber means, the housing of the tip means having a unitary uninterrupted outer surface extending from the proximal end and including the distal end, which is enclosed, the surface including only smooth, rounded portions without any joints, junctions, exposed projections, and interruptions related to any other parts of the apparatus; irrigation fluid outlet means and aspiration inlet means both positioned at the distal end of the tip means adjacent to the enclosed, rounded distal end, facilitating fluid communication with the exterior of the distal end of the surgical tip means, the irrigation fluid outlet means comprising a plurality of outlet ports at or near the distal end of the surgical tip means and distributed at generally equally spaced apart positions radially about the longitudinal axis of the surgical tip means with solid portions of the housing separating the irrigation ports, except for a blocking solid portion, substantially wider than the solid portions, positioned immediately longitudinally adjacent the aspiration inlet means between the aspiration inlet means and any outlet ports of the irrigation fluid outlet means, the outlet ports of the irrigation fluid outlet means allowing increased and improved irrigation around a majority of the radial perimeter of the tip means, the blocking solid portion blocking irrigation fluid from being directly oriented towards the aspiration inlet means and from creating interference with aspiration of the apparatus, the irrigation outlet ports and the aspiration inlet means having smooth, rounded edges without exposed and raised joints, junctions and interruptions; irrigation fluid conduit means extending through said proximal end, body section, and distal end of the handle member for supplying irrigation fluid to the fluid reservoir of the nose chamber means, irrigation fluids to the irrigation fluid outlet means being supplied through the hollow interiors of the nose chamber means and the surgical tip means; aspiration fluid conduit means extending from the proximal end of the nose chamber through the body section to the proximal end of the handle member for conducting aspirated fluid and materials out of the proximal end of the handle member; an aspiration fluid cannula means being entirely enclosed in and extending from the distal end of the surgical tip means, through the hollow interior of the surgical tip means and the nose chamber means for transferring aspirated fluid between the aspiration inlet means and the aspiration fluid conduit means, the aspiration fluid cannula means having an end opening in stationary sealed fluid communication with the aspiration inlet means at the distal end of the surgical tip means.