Control of airway pressure during mechanical ventilation
First Claim
1. Apparatus for controlling patient airway pressure during exhalation, comprising:
- valve means,said valve means having first inlet means for connection to an exhalation tube from a patient airway, outlet means for connection to a source of negative pressure, and second inlet means having variable flow control means therein for controlling the flow of gas through said second inlet means, andmeans for controlling gas pressure in said valve means such that a gas pressure gradient between upstream and downstream sides of said second inlet means is equal to a gas pressure gradient between a patient airway and a downstream side of said second inlet means.
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Accused Products
Abstract
An endotracheal tube for patient ventilation is modified to permit measurement of pressure at the patient trachea by providing a chamber in the end of the ET tube to be located in the patient airway. This chamber has a highly pliant external wall with a degree of redundancy and is connected to a pressure measuring device exterior of the patient by a lumen in the wall of the ET tube. In addition, apparatus for controlling airway pressure during exhalation comprises valve means connected via a first inlet to an exhalation tube from a patient airway, connected to a source of negative pressure through an outlet and having a second inlet with a variable flow control means for controlling the flow of gas therethrough. Gas pressure is controlled within the valve by varying the pressure gradient between the upstream and downstream sides of the second inlet so that it equals the pressure gradient between the patient airway and the downstream side of the second inlet.
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Citations
15 Claims
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1. Apparatus for controlling patient airway pressure during exhalation, comprising:
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valve means, said valve means having first inlet means for connection to an exhalation tube from a patient airway, outlet means for connection to a source of negative pressure, and second inlet means having variable flow control means therein for controlling the flow of gas through said second inlet means, and means for controlling gas pressure in said valve means such that a gas pressure gradient between upstream and downstream sides of said second inlet means is equal to a gas pressure gradient between a patient airway and a downstream side of said second inlet means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification