05438980 is referenced by 205 patents and cites 39 patents.

An apparatus (10) for controlling the pressure of a respiratory gas delivered to a patient includes a phase detection circuit (24) for determining the inhalation and exhalation phases of the patient's respiratory cycle. More particularly, a flow signal representative of the respiratory flow is compared to second signal, offset in time and scaled in magnitude relative to the flow signal, in order to determine the transition from one phase to the next.

Title
Inhalation/exhalation respiratory phase detection circuit
Application Number
8/3129
Publication Number
5438980
Application Date
January 12, 1993
Publication Date
August 8, 1995
Inventor
Steven L Phillips
Olathe
KS, US
Agent
Fulwider Patton Lee & Utecht
Assignee
Puritan Bennett Corporation
KS, US
IPC
A61M 16/00
View Original Source