# US 11,998,691 B2 · Ventilator arrangement and method for controlling a ventilator arrangement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,691 B2 - Document ID: US11998691B2 - Status: Granted - Kind: B2 - Application number: 15/733,475 - Filed: 2019-02-06 - Published: 2020-12-10 - Granted: 2024-06-04 - Earliest claimed: 2018-02-06 - Assignees: Maquet Critical Care AB - Applicants: Maquet Critical Care AB - Inventors: Magnus Hallbäck - Web page: https://patentgrep.com/patent/US11998691B2 ## CPC - A61M 16/024: {including calculation means, e.g. using a processor} - A61B 5/091: Measuring volume of inspired or expired gases, e.g. to determine lung capacity - A61M 16/12: by mixing different gases - A61M 16/204: {used for inhalation control} - A61M 16/205: {used for exhalation control} - A61M 2016/0027: {pressure meter} - A61M 2016/0036: {in the breathing tube and used in both inspiratory and expiratory phase} - A61M 2016/0039: {in the inspiratory circuit} - A61M 2016/0042: {in the expiratory circuit} - A61M 2205/15: Detection of leaks - A61M 2205/50: with microprocessors or computers - A61M 2205/502: User interfaces, e.g. screens or keyboards - A61M 2205/505: Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches - A61M 2205/52: with memories providing a history of measured variating parameters of apparatus or patient - A61M 2205/581: by audible feedback - A61M 2205/582: by tactile feedback - A61M 2205/583: by visual feedback - A61M 2230/40: Respiratory characteristics - 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)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A method for controlling a ventilator arrangement might be suitable for maintaining or achieving a desired end expiratory lung volume, EELV, of a subject when an external manoeuvre is performed on the subject ventilated by the ventilator arrangement. The ventilator arrangement applies a set positive end-expiratory pressure, PEEP, level for performing the ventilation. ## Claims ### Claim 1 A method for controlling a ventilator arrangement for maintaining an end expiratory lung volume (“EELV”), of a subject when an external manoeuvre, is performed on the subject ventilated by the ventilator arrangement, wherein the ventilator arrangement applies a set positive end-expiratory pressure (“PEEP”) level for performing the ventilation, the method comprising: performing a ventilation pause in the ongoing ventilation of the subject prior to the external manoeuvre; determining a possible change in airway pressure (APaw) of the subject during pausing of the ventilation; and resuming the ventilation of the subject after at least parts of the external manoeuvre, wherein an updated set level for the PEEP is applied, wherein the updated set level basically corresponds to the sum of the set PEEP level prior to pausing the ventilation and the determined possible change in airway pressure (APaw) of the subject, wherein the external manoeuvre is changing the subject's position so that a lung volume of the subject is affected. ### Claim 2 (depends on 1) The method according to claim 1, wherein the pausing of the ventilation is initiated by a received user input at an input means of the ventilator arrangement. ### Claim 3 (depends on 1) The method according to claim 1, wherein the resumption of the ventilation starts at a first pre-determined time period after pausing the ventilation. ### Claim 4 (depends on 3) The method according to claim 3, further comprising the step of indicating the resumption of the ventilation a second pre-determined time period prior to resuming the ventilation. ### Claim 5 (depends on 1) The method according to claim 1, wherein the ventilation of the subject is paused during an expiration phase or during an inspiration phase. ### Claim 6 (depends on 1) The method according to claim 1, wherein the external manoeuvre is divided in several sub-steps with pauses in between the sub-steps, and wherein the method is repeated for each sub-step of the external manoeuvre. ### Claim 7 (depends on 1) The method according to claim 1, further comprising the step of determining start conditions including at least breathing circuit leakage. ### Claim 8 (depends on 1) A non-transitory computer-readable data storage medium comprising instructions which, when executed by a computer, cause the computer to carry out the method according to claim 1. ### Claim 9 A ventilator arrangement for maintaining an end expiratory lung volume (“EELV”), of a subject when an external manoeuvre, is performed on the subject ventilated by the ventilator arrangement, wherein the ventilator arrangement applies a set positive end-expiratory pressure (“PEEP”) level for performing the ventilation, the method comprising: performing a ventilation pause in the ongoing ventilation of the subject prior to the external manoeuvre; determining a possible change in airway pressure (APaw) of the subject during pausing of the ventilation; and resuming the ventilation of the subject after at least parts of the external manoeuvre, wherein an updated set level for the PEEP is applied, wherein the updated set level basically corresponds to the sum of the set PEEP level prior to pausing the ventilation and the determined possible change in airway pressure (APaw) of the subject, wherein the external manoeuvre is changing the subject's position so that a lung volume of the subject is affected. ### Claim 10 (depends on 9) The ventilator arrangement according to claim 9, wherein the ventilator arrangement is arranged to initiate the pause of the ventilation based on a user action on an input means of the ventilator arrangement. ### Claim 11 (depends on 9) The ventilator arrangement according to claim 9, wherein the ventilator arrangement is arranged to resume the ventilation at a first pre-determined time period after pausing the ventilation. ### Claim 12 (depends on 11) The ventilator arrangement according to claim 11, wherein the ventilator arrangement is further arranged to indicate the resumption of the ventilation a second pre-determined time period prior to resuming the ventilation. ### Claim 13 (depends on 9) The ventilator arrangement according to claim 9, wherein the ventilator arrangement is further arranged to pause the ventilation of the subject during an expiration phase or during an inspiration phase. ### Claim 14 (depends on 9) The ventilator arrangement according to claim 9, wherein the ventilator arrangement further is arranged to determine start conditions including at least breathing circuit leakage.