US 11,940,099 B2
Gas flow alarm
Benjamin Johnson, Mansfield (GB); Martin Cooper, Mansfield (GB); Michael Brudenell, Mansfield (GB); and Richard Radford, Mansfield (GB)
Assigned to BPR Medical Limited, Mansfield (GB)
Appl. No. 17/436,994
Filed by BPR MEDICAL LIMITED, Mansfield (GB)
PCT Filed Mar. 6, 2020, PCT No. PCT/GB2020/050542
§ 371(c)(1), (2) Date Sep. 7, 2021,
PCT Pub. No. WO2020/178600, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 1903074 (GB), filed on Mar. 7, 2019.
Prior Publication US 2022/0178500 A1, Jun. 9, 2022
Int. Cl. F17C 13/02 (2006.01); A61M 16/00 (2006.01); A61M 16/10 (2006.01); A61M 16/20 (2006.01)
CPC F17C 13/02 (2013.01) [A61M 16/0003 (2014.02); A61M 16/0051 (2013.01); A61M 16/1005 (2014.02); A61M 16/208 (2013.01); A61M 2016/0027 (2013.01); A61M 2016/0033 (2013.01); A61M 2205/581 (2013.01); F17C 2205/0329 (2013.01); F17C 2205/0335 (2013.01); F17C 2205/0338 (2013.01); F17C 2205/035 (2013.01); F17C 2221/011 (2013.01); F17C 2223/0123 (2013.01); F17C 2250/036 (2013.01); F17C 2250/043 (2013.01); F17C 2250/0443 (2013.01); F17C 2270/025 (2013.01)] 18 Claims
OG exemplary drawing
 
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.