Sampling system with selectable pumps to communicate with readin

Details Sampling system with selectable pumps to communicate with readin Sampling system with selectable pumps to communicate with readin

1999-07-01

2000-09-19

Noland, Thomas P.

Measuring and testing

Sampler, sample handling, etc.

Capture device

73 6456, 7386415, 7386421, 702 32, G01N 3510

Patent

active

061195332

ABSTRACT:
A blood clot detector includes a pressure transducer on an aspiration line to provide output voltage data to a microprocessor corresponding to the vacuum level during aspiration. The microprocessor integrates the vacuum readings over time during the aspiration cycle to provide a pressure integral for each test sample aspiration. A pressure integral is determined for an unclotted aspiration and used as a reference for comparison with the pressure integrals of each test sample aspiration to determine whether a blood clot has interfered with the test sample aspiration. A valve is provided across an analytical line and an aspiration line to provide selective communication between the aspiration line and the analytical line or to prevent such communication. Communication between the aspiration line and the analytical line permits transfer of a test sample from the aspiration line to the analytical line if the test sample is considered acceptable for sample analysis. Acceptability of the test sample for analysis is based upon a predetermined difference between the reference pressure integral and each test sample pressure integral.

REFERENCES:
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patent: 4134289 (1979-01-01), Bohl et al.
patent: 4545235 (1985-10-01), Barnett
patent: 4597943 (1986-07-01), Sugiyama et al.
patent: 5013529 (1991-05-01), Itoh
patent: 5268147 (1993-12-01), Zas et al.
patent: 5503036 (1996-04-01), Nguyen et al.
patent: 5504010 (1996-04-01), Mitani et al.
Abstracts of EP-571100A1 (Nov. 24, 1993) by Tolonen et al EPO Abstract Entitled "Pipette Apparatus".
Derwent Abstract (Acc-No: 1993-338467 Entitled "Pipette Appts. Operating With Air Piston-Air Space Pressure is Monitored and Used to Detect Malfunction or for Control".

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