Pressure support system with machine delivered breaths

摘要

A method of operating a ventilator or pressure support system that automatically determines a timed back up rate for the patient based on the patient's spontaneous breathing patterns. The aggressiveness of the determined rate increases as the patient takes less spontaneous breaths. Also, a method wherein one or more mechanisms are used to determine whether a machine breath should be issued. Each mechanism consists of a basic timing element coupled with one or more logical permits. Both the timing element and each of the one or more logical permits must be satisfied to allow the timing mechanism to trigger a machine breath.

主权项

1. A method of providing pressure support to a patient, comprising:
monitoring data relating to respiratory activity of the patient; monitoring a timer; determining that the timer has expired; after determining the timer has expired, determining whether all of one or more logical permits are satisfied based on the data relating to respiratory activity of the patient; and providing a machine breath to the patient if it is determined that all of the one or more logical permits are satisfied, wherein the one or more logical permits include a first logical permit relating to expiration of the patient and wherein the first logical permit will be determined to be satisfied if expiration of the patient is deemed to be complete, and wherein expiration of the patient is deemed to be complete in response to analyzing patient flow over a predetermined period and observing a point in time wherein both a derivative of the patient flow and an absolute value of the patient flow are less than a predetermined value.