Surgery – Instruments – Cutting – puncturing or piercing
Patent
1992-05-07
1994-06-21
Lewis, Ralph
Surgery
Instruments
Cutting, puncturing or piercing
606107, 604 22, 83 53, 83177, A61B 1722
Patent
active
053225040
ABSTRACT:
A method and apparatus for the excision and removal of tissue, such as the lens of the eye includes a pencil-like handpiece having a cannula probe extending from the distal end thereof. The probe includes an inner jet tube to direct a high pressure jet of fluid toward a tissue target, and an outer concentric aspiration tube to aspirate and remove fluid and tissue. The jet tube is recessed proximally within the concentric aspiration tube, and the aspiration tube has an end area significantly larger than the end area of the jet tube. These factors cooperate so that the negative pressure exerted by the aspiration tube creates a suction force that offsets and exceeds the force of the fluid jet. The jet tube is connected to a fluid pressure system including a positive displacement pump, a pressure regulator, safety release, control valve, and a pulse former. The jet tube emits pulses of high pressure fluid that impinge reiteratively on the target, creating shock waves that fracture and emulsify the lens tissue, and the fluid also acts as a solvent to transport the emulsified tissue into the aspiration tube. The handpiece also includes a vacuum bypass port disposed to be selectively occluded by a finger of the surgeon, so that vacuum pressure may be released immediately when needed.
REFERENCES:
patent: 3930505 (1976-01-01), Wallach
patent: 4857047 (1989-08-01), Amoils
patent: 4878900 (1989-11-01), Sundt
patent: 4915691 (1990-04-01), Jones et al.
patent: 5013300 (1991-05-01), Williams
patent: 5037431 (1991-08-01), Summers et al.
patent: 5037432 (1991-08-01), Molinari
patent: 5097731 (1992-03-01), Vives et al.
patent: 5135482 (1992-08-01), Neracher
patent: 5135484 (1992-08-01), Wright
patent: 5165602 (1992-11-01), Arnout et al.
Doherty Rex E.
Gillies Ray
Hicks E. Larry
Lewis Ralph
United States Surgical Corporation
Zimmerman Harris
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