Apparatus and method for the examination of a liquid medium

Details Apparatus and method for the examination of a liquid medium Apparatus and method for the examination of a liquid medium

1987-12-22

1989-06-27

Cohen, Lee S.

Surgery

Truss

Pad

436 68, 204403, A61B 500

Patent

active

048419745

ABSTRACT:
A measuring canal is provided which is connected to a catheter. The canal includes a measuring sensor and a reference sensor. The catheter includes several lumens that have a common opening to the liquid measuring medium. The flow direction of an infusion solution at the opening is reversible. A second lumen of the catheter is connected to the measuring canal which is provided with at least one measuring sensor and with at least one reference sensor as well as with a device for setting the outflow of the apparatus to a predetermined velocity. The flow of an infusion fluid and the liquid medium alternates in such a fashion that during a first time interval the measuring sensor is coupled to the liquid medium and the reference sensor is coupled to the infusion solution. In a second interval the situation is reversed so that the original measuring sensor is coupled to the infusion solution and the original reference sensor is connected to the liquid medium. The unique arrangement is effective for blood examination. Drift problems and toxicity problems cannot occur and no electrochemical reference electrode is required.

REFERENCES:
patent: 3512517 (1970-05-01), Kadish et al.
patent: 4221567 (1980-09-01), Clark et al.
patent: 4535786 (1985-08-01), Kater
patent: 4592824 (1986-06-01), Smith et al.
patent: 4600495 (1986-07-01), Fogt
Medical and Biological Engineering Ann. N.Y. Acad. Sc., vol. 87 (1960) pp. 658-668.

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