Method and apparatus for supplying fresh gas to a patient during manual ventilation
First Claim
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1. A method for ventilating a patient comprising the steps of:
- connecting an automatically operating ventilator end a manually operable breathing bag to airways of a patient;
manually squeezing said breathing bag in an inspiration phase to impose an inspiration on the patient and subsequently manually relaxing squeezing of said breathing bag to permit exhalation by, the patient of a flow of expired gas during an expiration phase;
non-manually feeding fresh gas from said ventilator into said breathing bag during said expiration phase with a flow corresponding to said flow of expired gas; and
conducting said flow of expired gas out of said ventilator system.
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Abstract
In a method for supplying fresh gas in manual ventilation of a patient and in a ventilator system for practicing the method, the supply of fresh gas to a breathing bag is regulated. During inspiration, the breathing bag is squeezed, imposing an inspiration on the patient. A detector at the breathing bag senses when the patient exhales, and an identical flow of gas is fed to the system via an inspiratory valve, the flow of fresh gas is directed into the breathing bag and expired gas is prevented from entering the breathing bag. An expiratory valve simultaneously opens to conduct expired gas out of the system.
116 Citations
37 Claims
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1. A method for ventilating a patient comprising the steps of:
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connecting an automatically operating ventilator end a manually operable breathing bag to airways of a patient; manually squeezing said breathing bag in an inspiration phase to impose an inspiration on the patient and subsequently manually relaxing squeezing of said breathing bag to permit exhalation by, the patient of a flow of expired gas during an expiration phase; non-manually feeding fresh gas from said ventilator into said breathing bag during said expiration phase with a flow corresponding to said flow of expired gas; and conducting said flow of expired gas out of said ventilator system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A ventilator system comprising:
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a patient tube connectable to a patient; ventilator means, connected to said patient tube, for non-manually controlling a flow of gas in the patient tube to ventilate a patient; a breathing bag connected to said patient tube for manually controlling a flow of gas in the patient tube for ventilating a patient; parameter detector means for sensing a parameter related to respiration of a patient; control means in said ventilator means for controlling said flow of gas in said patient tube dependent on the parameter sensed by said parameter detector means for feeding a flow of fresh gas, during expiration by a patient, into said breathing bag corresponding to a flow of gas expired by a patient; and means for conducting said gas expired by a patient out of said ventilator system. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification