# US 12,766,283 B2 · Respiratory gas supply system

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- Number: US 12,766,283 B2
- Document ID: US12766283B2
- Status: Granted
- Kind: B2
- Application number: 16/202,260
- Filed: 2018-11-28
- Published: 2019-05-30
- Granted: 2026-10-20
- Earliest claimed: 2017-11-30
- Assignees: Loewenstein Medical Technology S.A.
- Applicants: Loewenstein Medical Technology S.A.
- Inventors: Matthias Schwaibold; Mario Scheerer; Christof Schroeter
- Web page: https://patentgrep.com/patent/US12766283B2

## CPC

- A61M 16/024: {including calculation means, e.g. using a processor}
- A61M 16/0465: {Tracheostomy tubes; Devices for performing a tracheostomy; Accessories therefor, e.g. masks, filters}
- A61M 16/0666: {Nasal cannulas or tubing (devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02)}
- A61M 16/08: Bellows; Connecting tubes {(having means for taking samples G01N1/22); Water traps; Patient circuits}
- A61M 16/1075: {by influencing the temperature (A61M16/1045 takes precedence)}
- A61M 16/16: Devices to humidify the respiration air {(A61M16/1045 takes precedence)}
- A61M 2016/0027: {pressure meter}
- A61M 2016/003: {with a flowmeter}
- A61M 2016/0033: {electrical}
- A61M 2016/0039: {in the inspiratory circuit}
- A61M 2016/0042: {in the expiratory circuit}
- A61M 16/04: Tracheal tubes (catheters in general A61M25/00)
- A61M 16/0672: {Nasal cannula assemblies for oxygen therapy}
- A61M 16/12: by mixing different gases
- A61M 16/125: {Diluting primary gas with ambient air}
- A61M 16/14: by mixing different fluids, one of them being in a liquid phase
- A61M 16/20: Valves specially adapted to medical respiratory devices
- A61M 2202/0208: Oxygen
- A61M 2202/0216: Ozone
- A61M 2205/18: with alarm
- A61M 2205/502: User interfaces, e.g. screens or keyboards
- A61M 2202/0014: removed from the body
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

Disclosed is a respiratory gas supply system comprising a respiratory gas source, a control unit, a pressure control module, a flow control module, a pressure sensor device, a flow sensor device and a user interface for the specification of respiratory gas supply parameters or for the exchange of data. The control unit alternately activates the pressure control module and the flow control module, with the pressure control module controlling the respiratory gas source to specify a respiratory gas pressure in the range of 0-90 mbar and the flow control module controlling the respiratory gas source to specify a respiratory gas flow in the range of 0-90 l/min.

## Claims

### Claim 1

A system for supplying respiration gas, wherein the system comprises
a respiration gas source;
a memory for storing specified parameters;
a pressure sensor device configured to provide a pressure signal;
a flow sensor device configured to provide a flow signal;
a user interface configured for specifying parameters of the respiratory gas supply or for data exchange;
a control unit configured to operate in (i) a pressure control mode in which the respiration gas source is actuated to specify a respiration gas pressure as Expiratory Positive Airway Pressure (EPAP) and an inspiratory pressure as Inspiratory Positive Airway Pressure (IPAP) that is higher than the EPAP, or (ii) a flow control mode in which the respiration gas source is actuated to specify a respiration gas flow, based on a specification input by a user via the user interface or automatically based on information stored in the memory, the control unit being further configured to recognize interrupted breathing from the pressure signal and/or the flow signal;
a patient interface;
a respiratory gas tube for delivering respiratiory gas from the respiration gas source to the patient interface;
a humidifier and/or an oxygen source and/or a nebulizer and/or a heater;
and wherein the respiration gas source is actuated for flow control with the control unit specifying the respiration gas flow while the user is awake and for pressure control with the control unit specifying at least one respiration gas pressure level that is modulated depending on the pressure signal and/or the flow signal while the user is asleep, wherein the respiration gas pressure level—when interrupted breathing is recognized—is modulated such that the control unit specifies a higher difference between EPAP and IPAP, wherein the control unit is further configured to attempt to generate a set respiration gas flow when the flow control mode is activated, wherein a respiration gas pressure required for generating the set respiration gas flow is determined, wherein—when the respiration gas pressure required for generating the set respiration gas flow reaches a specified threshold for a determined period of time—a switch to the pressure control mode takes place and a specified maximum permissible respiration gas pressure is maintained even when a generated respiration gas flow is below the set respiration gas flow, and—when the set respiration gas flow is again reached or exceeded for a determined period of time—a switch back to the flow control mode takes place, and wherein the EPAP level comprises at least two pressure levels and increases from an initially low EPAP toward an EPAP at an end of expiration.

### Claim 2 (depends on 1)

The system of claim 1, wherein in the pressure control mode the respiration gas source is actuated to specify a ramp-shaped pressure increase from an expiratory pressure level to an inspiratory pressure level and to specify a ramp-shaped pressure drop from the inspiratory pressure level to the expiratory pressure level.

### Claim 3 (depends on 1)

The system of claim 1, wherein in the pressure control mode the respiration gas source is actuated to specify the inspiratory pressure with a specifiable pressure waveform and to specify the expiratory pressure with a specifiable pressure waveform.

### Claim 4 (depends on 1)

The system of claim 1, wherein in the pressure control mode the respiration gas source is actuated to specify the inspiratory pressure at two different inspiratory pressure levels and to specify the expiratory pressure at two different expiratory pressure levels.

### Claim 5 (depends on 1)

The system of claim 1, wherein the control unit is configured to actuate the respiration gas source to specify a specifiable respiration gas flow and, depending on the pressure signal and/or the flow signal, to increase the respiration gas pressure until the specified respiration gas flow has been reached.

### Claim 6 (depends on 1)

The system of claim 1, wherein the flow sensor device is configured to monitor the respiration gas flow and the pressure sensor device is configured to monitor the respiration gas pressure, the control unit is configured to actuate the respiration gas source to specify a specifiable respiration gas flow and, based on the flow signal, to check whether the specified respiration gas flow has been reached and, based on the pressure signal, to check whether a specified maximum respiration gas pressure has been reached, and wherein the control unit does not increase the specified maximum respiration gas pressure further when the specified respiration gas flow is not reached.

### Claim 7 (depends on 1)

The system of claim 1, wherein the system is configured to regulate an amount of supplied respiration gas via a flow meter and to set application of a desired amount of oxygen via an oxygen mixer.

### Claim 8 (depends on 1)

The system of claim 1, wherein the system is configured to deactivate an internal oxygen source when the flow control mode is activated and in this case to use an external oxygen source.

### Claim 9 (depends on 1)

The system of claim 1, wherein the system is configured such that a pulse oximeter or a CO2 measuring device is adaptable and is configured to communicate with the pulse oximeter or CO2 measuring device and/or to supply the pulse oximeter or the CO2 measuring device with energy.

### Claim 10 (depends on 9)

The system of claim 9, wherein the system is configured to set a flow rate and an oxygen admixture using an automatic algorithm via measured values of the pulse oximeter and/or the CO2 measuring device.

### Claim 11 (depends on 9)

The system of claim 9, wherein the control unit takes account of measured values of the pulse oximeter and/or the CO2 measuring device when an oxygen source and/or the flow control mode is activated and/or controlled.

### Claim 12 (depends on 1)

The system of claim 1, wherein the system is configured to raise the respiration gas pressure level from a PEEP or EPAP level to an IPAP level in the form of a specifiable ramp or waveform and to lower the respiration gas pressure level from the IPAP to the EPAP level in the form of a specifiable ramp or waveform.

### Claim 13 (depends on 1)

The system of claim 1, wherein the control unit is configured, when the flow control mode is activated, to determine which breathing phase is present, and to recognize fluctuations throughout breathing and to attempt to continuously compensate for the fluctuations.