Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
1999-06-07
2001-06-05
Dawson, Glenn K. (Department: 3761)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S204220
Reexamination Certificate
active
06240919
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
(Not Applicable)
STATEMENT RE: FEDERALLY SPONSORED RESEARCH/DEVELOPMENT
(Not Applicable)
BACKGROUND OF THE INVENTION
The present invention relates in general to respiratory ventilation, and in particular to methodology for providing pressure support to respiratory airways during ventilator-assisted respiration.
Certain respiratory diseases not only require patient special care with respect to physical activity and attendant exertion levels, but also require specialized mechanical augmentation to permit the patient to maintain pressure support to respiratory airways. Thus, while lung dysfunction, lung tissue degradation, autonomic nervous system disability, etc. can deprive an individual of adequate oxygenation and attendant carbon dioxide removal, dysfunctional air delivery conduits also can contribute to reduced respiratory efficiency since affected respiratory airways may lack adequate support to maintain adequate structural stability during the respiration process.
One present method for treating airway malfunction provides for positive end expiratory pressure application by a ventilator. A second treatment method is a widely-used breathing technique called “pursed lip breathing.” Both procedures involve back pressure applied to the respiratory airways to thereby attempt to maintain airway structure and resultant passageway openness. While these approaches certainly aid respiration, it is generally recognized that their respective adequacies can be improved. Accordingly, a primary object of the present invention is to provide a method of supporting respiratory airways by applying variable pressure magnitudes depending upon the timing within the respiratory cycle.
Another object of the present invention is to provide methodology for supporting respiratory airways in association with delivery thereof by a ventilator.
Yet another object of the present invention is to provide respiratory airway support wherein traditional positive end expiratory pressure is augmented with supplemental pressure support.
These and other objects of the present invention will become apparent throughout the description thereof which now follows.
BRIEF SUMMARY OF THE INVENTION
The present invention is a method of supporting respiratory airways during ventilator-assisted respiration where the ventilator maintains a positive end expiratory pressure in the respiratory airways during the expiratory phase. The method comprises first activating the ventilator to maintain the positive end expiratory pressure, and thereafter applying two supplemental pressure supports. The first such supplemental pressure support comprises applying pressure of a magnitude greater than the positive end expiratory pressure and occurs upon initiation of and for the duration of an inspiratory phase. The second supplemental pressure support comprises applying pressure of a magnitude greater than the first supplemental pressure support and occurs upon initiation of and for the duration of the patent expiratory flow. In this manner, proper lung evacuation can occur throughout each expiratory cycle by supporting respiratory airways throughout the respiration cycle. Thus, the pressure of inspiratory air, already positive-pressure-influenced by inhalation, is amplified through the addition of the first supplemental pressure upon initiation of and for the duration of inhalation to thereby provide a slight inspiratory boost for offsetting anatomical positive end expiratory pressure. Continued respiratory airway support occurs during the expiration cycle by introducing the second supplemental pressure upon initiation of and throughout exhalation to thereby increase already-present positive end expiratory pressure and intensify respiratory airway support. Consequently, full time pressure augmentation is applied to respiratory airways to thereby structurally support the airways and thus maintain in an open configuration the pathways in communication with lungs.
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patent:
MacDonald John J.
Richard Ronald F.
Dawson Glenn K.
Mitchell Teena
Stetina Brunda Garred & Brucker
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