Surgery – Means for introducing or removing material from body for... – Material introduced into and removed from body through...
Patent
1995-10-23
1997-12-02
Mendez, Manuel
Surgery
Means for introducing or removing material from body for...
Material introduced into and removed from body through...
A61B 1700
Patent
active
056930135
ABSTRACT:
An apparatus used during eye surgery for aspirating lens debris from a surgical site at an anterior chamber of the eye during a cataract operation. The apparatus includes a container of flushing liquid connected to a hose. A handpiece is provided which includes a double lumen cannula having a first lumen and a second lumen connected to the hose for delivering flushing liquid to the surgical site. An aspiration conduit is connected to the first lumen. A peristaltic pump is connected to the aspiration conduit for aspirating flushing liquid containing lens debris from the surgical site. The motor drives the peristaltic and a computer controls the rotational speed of the motor based on the preset vacuum rise rate. A ventilation valve is connected to the aspiration conduit between the double cannula and the peristaltic pump. The valve is selectively opened to admit air into the aspiration conduit. A pressure-measuring sensor is coupled to the aspiration conduit and an automatic vacuum reduction control is connected to the pressure-measuring sensor for controlling the ventilation valve. The automatic vacuum reduction control opens the ventilation valve to instantly reduce the vacuum level. This occurs when the vacuum reaches or exceeds a predetermined vacuum change rate due to a clog in the aspiration conduit.
REFERENCES:
patent: 4841984 (1989-06-01), Armeniades et al.
patent: 4870964 (1989-10-01), Bailey, Jr. et al.
patent: 5261883 (1993-11-01), Hood et al.
patent: 5322504 (1994-06-01), Doherty et al.
Hans Geuder GmbH
Mendez Manuel
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