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US 5,141,871 AGranted
Fluid dispensing system with optical locator
AssigneePB Diagnostic Systems, Inc.
InventorsFareed Kureshy, Ernest W. Long, Shailendra Singh
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AssigneePB Diagnostic Systems, Inc.
InventorsFareed Kureshy, Ernest W. Long, Shailendra Singh
Estimating the term…
There is described an analytical isntrument for the analysis of fluids such as biological fluids. The instrument includes a fluid dispensing system having a pipette for dispensing fluid test samples and test reagents to assay cartridges. An optical detection system provides a light beam which intercepts a downward travel path of the pipette prior to its reaching the dispense position. Measurement of the intensity of the light beam in conjunction with the position of the pipette enables a controller to indicate the presence or absence of a pipette tip. In addition, interception of the light beam by the pipette initiates a final approach sequence for the pipette to the dispense position above an assay cartridge by a predetermined increment of travel.
A method for dispensing fluid to an assay element in an analytical instrument including a pipette, the instrument comprising transport means for advancing the pipette between s reservoir holding a fluid, the assay element and a supply of disposable pipette tips adapted to be affixed to a stem of the pipette, the method comprising:
A method according to claim further comprising the steps of:
An analytical instrument in combination with a reservoir storing a fluid and employing a pipette for dispensing the fluid to an assay element, the instrument comprising:
Dependencies are inferred from the claim text.