Patent ID: 11940099
Assignee: BPR MEDICAL LIMITED
Field: Medical technology (Instruments)
Classification: CPC F  A | IPC A  F

Claim 0:
1. A gas flow alarm apparatus comprising:
a device configurable to introduce back pressure into a flow of gas;
a supply sensor configured to determine whether supply flow to the device is enabled;
a pressure sensor configured to determine whether the flow of gas through the device has developed back pressure;
a bleed orifice, in fluid communication with a flow outlet, configured to allow free passage of gas through the bleed orifice at a flow rate less than a lowest flow rate provided for a supply control which enables gas flow to the device; and
logic circuitry in communication with the supply sensor and the pressure sensor configured to:
determine whether the supply flow to the device is enabled and whether the flow of gas through the device has developed back pressure; and
if the supply flow is not enabled or the flow of gas has not developed back pressure, to activate an alarm condition.