(i9) United States
(12) Patent Application Publication
CALLUAUD et al.
Dec. 20, 1999, now Pat. No. 6,990,977, which is a continuation of application No. 08/989,150, filed on Dec. 12, 1997, now Pat. No. 6,029,660.
(30) Foreign Application Priority Data
Dec. 12, 1996 (AU) P04186
(51) Int. CI.
(52) U.S. CI 128/200.23; 128/203.14
A substance delivery apparatus for use with a system for supplying breathable gas to a human or animal includes a sensor to measure the pressure of the supplied breathable gas and to detect inhalation by the human or animal; and a reservoir, a conduit, a pump, and a diaphragm to deliver the substance to the human or animal during inhalation at a pressure higher than the supplied pressure of the breathable gas.