METHOD AND DEVICE TO DETECT VENOUS AIR EMBOLISM

摘要

PURPOSE: To monitor a patient's respiratory organs continuously and to signalize the existence of an air block in a vein automatically by installing a treatment device which has an output to signalize the existence of an air block when nitrogen concentration in the vein exceeds a prescribed threshold of the nitrogen concentration within a prescribed period of time. CONSTITUTION: This detector 10 of an air block in a vein has a respiratory organ analyzer 20 and a data processor 30. The respiratory organ analyzer 20 receives a patient's respiration air and analyzes it, then sends signals corresponding to the oxygen concentration, nitrogen concentration, and CO2 concentration, to the data processor 30. The data processor 30 receives direction indication from a program source 40, and analyzes the oxygen concentration, nitrogen concentration, and CO2 concentration in the patient's respiration air. The data processor 30 outputs the results of the analysis to an alarm 50 and a display 60. (The detector 10 analyzes the gas concentration every five breathes extracted from a complete respiration cycle (1 inspiration and 1 expiration), and determines whether there is an air block in a vein by comparing the gas concentration with the threshold.