Method for controlling fluid flow to and from an eye during...

Details Method for controlling fluid flow to and from an eye during... Method for controlling fluid flow to and from an eye during...

2006-02-21

2006-02-21

Bennett, Henry (Department: 3743)

Surgery

Means for introducing or removing material from body for...

Material introduced into and removed from body through...

C604S027000, C604S028000, C604S030000, C604S043000, C604S506000

Reexamination Certificate

active

07001356

ABSTRACT:
A method and apparatus provided for controlling fluid control to and from an eye or a phacoemulsification handpiece. The handpiece includes an ultrasonically driven, hollow, sleeved needle and the method includes inserting the needle and sleeve into an eye for phacoemulsification of eye tissue and introducing fluid into the eye through an annulus established between the sleeve and the needle. Aspiration of fragmented tissue and fluid from the eye is conducted through the hollow needle. An initial irrigation fluid pressure is determined and the irrigation fluid flow and aspiration fluid flow are adjusted based upon the initial determination. Thereafter continued determination of irrigation fluid pressure is utilized to continuously adjust irrigation fluid flow and/or aspiration fluid flow.

REFERENCES:
patent: 4841984 (1989-06-01), Armeniades et al.
patent: 5865764 (1999-02-01), Moorhead
patent: 5910110 (1999-06-01), Bastable

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