Start-up protocols for nitric oxide delivery device
Start-up protocols for a device and method for administering NO is described.
1 . A system, comprising:
a delivery line;
a source of NO 2 gas;
a device converting the NO 2 gas to an NO gas in a predetermined amount, wherein the NO gas is then supplied to the delivery line;
a first source of air and/or oxygen and a second source of air and/or oxygen, wherein the second source is a back-up source and wherein the first and the second sources of air and/or oxygen uninterruptedly supply air and/or oxygen,
a first pump, connected to the first source, which supplies air and/or oxygen from the first source to the delivery line;
a second pump, wherein the second pump is a back-up pump that is connected to the second source and that supplies air and/or oxygen from the second source to the delivery line, wherein the second pump is only used in conditions comprising failure of the first pump, flushing of the system, providing a NO gas flow dilution, or a combination thereof; and
wherein the first pump comprises check valves preventing air and/or oxygen from the second pump from entering the first pump.
2 . The system of claim 1 , wherein the source of NO 2 gas is a liquid N 2 O 4 .
3 . The system of claim 2 , wherein NO 2 gas is formed by heating of the liquid N 2 O 4 .
4 . The system of claim 1 , further comprising a leak detector.
5 . The system of claim 4 , wherein the leak detector automatically assesses the system for leaks.
6 . The system of claim 1 , wherein the system further comprises a filter configured to substantially remove dirt and/or dust particles from the source of air and/or oxygen.
7 . The system of claim 1 , wherein the system further comprises a moisture exchanger.
8 . The system of claim 2 , wherein in the last 30 min the liquid N 2 O 4 is depleted, and the NO is formed from a hot and pressured NO 2 /N 2 O 4 vapor.
9 . The system of claim 1 , further comprising a feedback loop, wherein the feedback loop controls a temperature increase to maintain the predetermined amount of NO.
10 . The system of claim 1 , wherein the controller is configured to detect the first pump failure, shut the first pump, and turn the second pump on for uninterrupted delivery of air and/or oxygen.
11 . The system of claim 1 , wherein the system further comprises a first NO sensor and a second NO sensor, wherein the first and the second NO sensors are independent of each other.
12 . The system of claim 1 , wherein the system further comprises a NO 2 sensor positioned in the delivery line.
13 . The system of claim 1 , wherein the system further comprises an O 2 sensor.
14 . The system of claim 1 , further comprising a controller determining the remaining NO gas supply based on a temperature and/or time interval at the temperature needed to maintain the predetermined amount of NO and providing an alert when up to 30 min of the NO gas supply is left in the system.
15 . The system of claim 4 , wherein the leak detector comprises a monitor of voltage drawn by valves in the device.
16 . The system of claim 1 , wherein the first pump is set to operate above stall conditions.
17 . The system of claim 1 , wherein the device comprises a volume accumulator and a restrictor configured to minimize pressure pulses of the first pump and/or the second pump.