Methods And Apparatus For Varying The Back-Up Rate For A Ventilator
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Accused Products
Abstract
A ventilator device delivers ventilatory support to a patient in a back up timed mode when patient respiration is not detected or a spontaneous mode when patient respiration is detected. The timing threshold governing the back-up mode is chosen to deviate from normal expected respiration time for the patient to promote patient initiated ventilation in the spontaneous mode but permit back-up ventilation in the event of apnea. Automated adjustments to the timing threshold during the timed mode are made from the less vigilant timing threshold to a more vigilant threshold at or near a timing of normal expected breathing of the patient. Such adjustments may be made from a minimum to a maximum vigilance timing settings or incrementally there between as a function of time in the timed mode which is preferably the number of delivered machine breaths.
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Citations
69 Claims
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1-55. -55. (canceled)
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56. Apparatus for providing back-up support ventilation for a patient comprising a blower for delivering pressure support ventilation to said patient during a breathing cycle of the patient;
- and means for controlling delivery of pressure support in the absence of a respiratory event within a threshold time interval following a preceding respiratory event;
said threshold time interval deviating from a normal expected respiration timing for the patient in a manner that promotes patient initiated synchronization of the pressure support ventilation but permits back-up ventilation in the event of an apnea. - View Dependent Claims (57, 58, 59, 60, 66, 67, 68, 69)
- and means for controlling delivery of pressure support in the absence of a respiratory event within a threshold time interval following a preceding respiratory event;
- 61. Apparatus in accordance with 60 wherein in response to a single respiratory event the threshold time interval is returned to an original threshold time interval that deviates from a normal expected respiration timing for the patient.
Specification