US 11,865,255 B2
Ventilator
Samuel M. Chang, Poway, CA (US)
Assigned to Invent Medical Corporation, Carlsbad, CA (US)
Filed by Invent Medical Corporation, Carlsbad, CA (US)
Filed on Mar. 14, 2022, as Appl. No. 17/694,563.
Application 17/694,563 is a continuation of application No. 16/426,275, filed on May 30, 2019, granted, now 11,305,078.
Application 16/426,275 is a continuation of application No. 15/087,522, filed on Mar. 31, 2016, abandoned.
Claims priority of provisional application 62/143,026, filed on Apr. 3, 2015.
Prior Publication US 2022/0203054 A1, Jun. 30, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 16/00 (2006.01); A61M 16/10 (2006.01); A61M 16/12 (2006.01); A61M 16/20 (2006.01)
CPC A61M 16/0066 (2013.01) [A61M 16/0051 (2013.01); A61M 16/0057 (2013.01); A61M 16/026 (2017.08); A61M 16/1005 (2014.02); A61M 16/12 (2013.01); A61M 16/202 (2014.02); A61M 16/204 (2014.02); A61M 16/205 (2014.02); A61M 16/1055 (2013.01); A61M 16/208 (2013.01); A61M 2016/0027 (2013.01); A61M 2016/0036 (2013.01); A61M 2016/0039 (2013.01); A61M 2016/1025 (2013.01); A61M 2202/0208 (2013.01); A61M 2202/0241 (2013.01); A61M 2202/0266 (2013.01); A61M 2202/0291 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3355 (2013.01); A61M 2205/50 (2013.01); A61M 2205/7518 (2013.01); A61M 2230/04 (2013.01); A61M 2230/06 (2013.01); A61M 2230/10 (2013.01); A61M 2230/205 (2013.01); A61M 2230/30 (2013.01); A61M 2230/432 (2013.01); A61M 2230/50 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A ventilator system comprising:
an air inlet connected to a first gas line;
an oxygen inlet connected to a second gas line;
a mixing chamber connected to both the first gas line and the second gas line;
an air pump and an air flow sensor both connected to the first gas line downstream of the air inlet and upstream of the mixing chamber;
an oxygen control valve and an oxygen flow sensor both connected to the second gas line upstream of the mixing chamber and downstream of the oxygen inlet;
a mixed gas pressure sensor connected to a third gas line downstream of the mixing chamber and upstream of a patient interface;
a mixing chamber oxygen sensor connected to the mixing chamber; and
a controller operably connected to the air pump and the oxygen control valve, and further configured to receive measurement signals from the air flow sensor, the oxygen flow sensor, the mixed gas pressure sensor and the mixing chamber oxygen sensor, and to implement a cascaded feedback loop that commands a flow target of a mixture of oxygen to air to achieve a target pressure, wherein the cascaded feedback loop comprises an outer, pressure feedback loop and dual inner feedback loops, comprising an oxygen flow control feedback loop and an air flow control feedback loop, and wherein the controller is further configured to:
obtain a target mixed gas pressure and a target mixed gas oxygen content;
determine, via the mixed gas pressure sensor and the mixing chamber oxygen sensor, current mixed gas pressure and current mixed gas oxygen content;
based on the current mixed gas pressure and current mixed gas oxygen content, determine a target air flow and a target oxygen flow that collectively achieve the target mixed gas pressure and the target mixed gas oxygen content;
determine, via the air flow sensor and the oxygen flow sensor, current air flow and current oxygen flow; and
based on the current air flow and the current oxygen flow, control the air pump and the oxygen control valve to obtain the target air flow and the target oxygen flow.