초록 ▼

An oxygen flow controller for use in administering oxygen from a pressure-regulated source on demand to a patient through a nasal cannula is disclosed. A flow path is opened by a solenoid valve in response to the negative pressure created in the nasal canula by the patient\s inhalation. The valve is

An oxygen flow controller for use in administering oxygen from a pressure-regulated source on demand to a patient through a nasal cannula is disclosed. A flow path is opened by a solenoid valve in response to the negative pressure created in the nasal canula by the patient\s inhalation. The valve is opened for the interval needed to maintain an inhalation to exhalation ration of one-to-two, and the timing cycle and the open and closed duration times of the valve are made to automatically match the patient\s breathing.

대표청구항 ▼

A flow controller for use in supplying gas from a source to a user, said flow controller comprising means to supply said gas to said user during periods of the user\s breathing inhalations and to not supply said gas to said user during periods of the user\s breathing exhalations, said supply means c

A flow controller for use in supplying gas from a source to a user, said flow controller comprising means to supply said gas to said user during periods of the user\s breathing inhalations and to not supply said gas to said user during periods of the user\s breathing exhalations, said supply means comprising means to match the durations of said inhalation and exhalation periods to the user\s actual breathing pattern based on a predetermined ratio of inhalation and exhalation duration times; said supply means comprising valve means, control means for said valve means and sensor means for sensing each inhalation breath of the user; said control means comprising circuit means comprising up/down counter means, first and second clock means, and steering circuit means for directing the pulses from one or the other of said first and second clock means to said up/down counter means; means to direct control signals from said control means to said valve means, means to direct pulses from one of said first and second clock means via said steering circuit means to said counter means to cause said counter means to count up from starting counting point, and means to direct pulses from the other of said first and second clock means via said steering circuit means to said counter means to cause said counter means to count down from the count generated by said pulses from said first-mentioned one of said clock means back towards said starting counting point, means to cause said control means to generate said control signal for said valve means when the count of said counter means comes to said starting counting point, and means to cause the ratio of the frequencies of pulse production from said first and second clock means to equal said predetermined ratio of the inhalation and exhalation duration times of the user\s breathing pattern.