Non-invasive device and method for measuring the cardiac...

Details Non-invasive device and method for measuring the cardiac... Non-invasive device and method for measuring the cardiac...

2005-07-18

2008-03-18

Nasser, Robert L (Department: 3735)

Surgery

Diagnostic testing

C600S526000, C600S532000, C600S529000

Reexamination Certificate

active

07344497

ABSTRACT:
The invention involves a device and method for ascertaining the functioning of the respiratory system and, in particular, determining the cardiac output of a patient. The device comprises an apparatus containing sensors for measuring the oxygen and carbon dioxide concentrations as well as the volume of air inhaled and exhaled by a patient. The patient is provided a mouthpiece for breathing into and out of the device, which subsequently measures oxygen partial pressures of the inhaled and exhaled air. In addition, the patient's arterial oxygen saturation is continuously measured through pulse oximetry and the pH and hemoglobin concentration is determined from a venous blood sample. From this data, the cardiac output of the patient may be calculated.

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