최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0435968 (2012-03-30) |
등록번호 | US-8844526 (2014-09-30) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 5 인용 특허 : 473 |
This disclosure describes systems and methods for providing novel back-up ventilation that allows the patient to trigger or initiate the delivery of breath. Further, this disclosure describes systems and methods for triggering ventilation when base flow is unknown or undeterminable by the ventilator
This disclosure describes systems and methods for providing novel back-up ventilation that allows the patient to trigger or initiate the delivery of breath. Further, this disclosure describes systems and methods for triggering ventilation when base flow is unknown or undeterminable by the ventilator.
1. A method for ventilating a patient with a ventilator, comprising: delivering a fixed base flow that is undeterminable;monitoring a windowed differential lung volume during exhalation;determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; andt
1. A method for ventilating a patient with a ventilator, comprising: delivering a fixed base flow that is undeterminable;monitoring a windowed differential lung volume during exhalation;determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; andtriggering inspiration based on the first of at least one of the following events to occur: a net negative change in lung volume with increasing magnitude is detected that is greater than an inspiratory trigger threshold directly after the step of determining that the windowed differential lung volume is about zero; anda predetermined amount of time expires. 2. The method of claim 1, wherein the fixed base flow is undeterminable because of at least one of the following conditions: an absence of an inspiratory flow sensor;a malfunction of the inspiratory flow sensor;a malfunction that prevents utilization of the inspiratory flow sensoran inspiratory module malfunction; anda malfunction that deactivates at least one of a data measurement subsystem and a data acquisition subsystem. 3. The method of claim 1, further comprising: determining a stable portion of exhalation;monitoring an exhalation flow during the stable portion of exhalation;estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation;wherein the events further include: a flow derivation based on the estimated base flow is detected that is greater than the inspiratory trigger threshold during the stable portion of exhalation. 4. The method of claim 3, wherein the stable portion of exhalation is a time during exhalation when a slope of patient exhalation flow is about zero. 5. The method of claim 3, wherein the stable portion of exhalation occurs when (Max(Pe)−Min(Pe)<1.5 cm H2O) and (Max(Qe)−Min(Qe)<1.5 LPM) for each computation cycle,wherein Max(Pe) is a maximum exhalation pressure, Min(Pe) is a minimum exhalation pressure, Max(Qe) is a maximum exhalation flow, and Min(Qe) is a minimum exhalation flow. 6. The method of claim 1, wherein the predetermined amount of time is one of 100 ms, 150 ms, and 200 ms. 7. The method of claim 1, wherein the net negative change in lung volume is calculated utilizing a following equation: ΔLV=WDLV*ΔT, wherein ΔLV is a differential lung volume, WDLV is a differential lung volume over a window, and ΔT is a sampling period. 8. The method of claim 7, wherein a window in the WDLV is 5 cycles for a 25 ms period. 9. The method of claim 1, wherein the inspiratory trigger threshold is a change in flow rate. 10. The method of claim 9, wherein the net negative change in lung volume is converted into flow rate for comparison to the inspiratory trigger threshold. 11. The method of claim 9, wherein the inspiratory trigger threshold is a change of at least 5 LPM. 12. A method for ventilating a patient with a ventilator, comprising: delivering a fixed base flow that is undeterminable;determining a stable portion of exhalation;monitoring an exhalation flow during the stable portion of exhalation;estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; andtriggering inspiration based on the first of at least one of the following events to occur: a flow derivation based on the estimated base flow is detected that is greater than an inspiratory trigger threshold during the stable portion of exhalation; andexpiration of a predetermined amount of time. 13. A ventilator system comprising: a pressure generating system adapted to generate a flow of breathing gas,wherein the pressure generating system delivers an undeterminable fixed base flow;a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient;at least one sensor operatively coupled to at least one of the pressure generating system, the patient, and the ventilation tubing system;a lung volume module for monitoring a windowed differential lung volume during exhalation and for determining when the windowed differential lung volume is at about zero after a decreasing trend toward zero; anda trigger module for triggering inspiration based on the first of at least one of the following events to occur: a net negative change in lung volume with increasing magnitude is detected directly after the lung volume module determines that the windowed differential lung volume is about zero that is greater than an inspiratory trigger threshold, anda predetermined amount of time expires. 14. The ventilator system of claim 13, further comprising: a base flow estimator module for determining a stable portion of exhalation, monitoring an exhalation flow during the stable portion of exhalation, and for estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation,wherein the events further include:a flow derivation based on an estimated base flow is detected that is greater than the inspiratory trigger threshold. 15. The ventilator system of claim 13, further comprising: a display in communication with at least one of the lung volume module and the trigger module, the display displays at least one of a WDLV, the net negative change in lung volume, an estimated base flow, an exhalation flow, a restricted period, a trigger threshold, and a sampling period for the WDLV. 16. A ventilator system comprising: a pressure generating system adapted to generate a flow of breathing gas;wherein the pressure generating system delivers an undeterminable fixed base flow,a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient;at least one sensor operatively coupled to at least one of the pressure generating system, the patient, and the ventilation tubing system, wherein the at least one sensor is capable of generating an output indicative of an exhalation flow;a base flow estimator module for determining a stable portion of exhalation, monitoring the exhalation flow during the stable portion of exhalation based on the output, and for estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; anda trigger module for triggering inspiration based on the first of at least one of the following events to occur: a flow derivation based on an estimated base flow is detected that is greater than an inspiratory trigger threshold, anda predetermined amount of time expires. 17. A computer-readable medium having computer-executable instructions for performing a method of ventilating a patient with a ventilator, the method comprising: repeatedly delivering a fixed base flow that is undeterminable;repeatedly monitoring a windowed differential lung volume during exhalation;repeatedly determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; andrepeatedly triggering inspiration based on the first of at least one of the following events to occur: a net negative change in lung volume with increasing magnitude is detected that is greater than an inspiratory trigger threshold directly after the step of determining that the windowed differential lung volume is about zero; anda predetermined amount of time expires. 18. A ventilator system, comprising: means for delivering a fixed base flow that is undeterminable;means for monitoring a windowed differential lung volume during exhalation;means for determining that the windowed differential lung volume is at about zero after a decreasing trend toward zero; andmeans for triggering inspiration based on the first of at least one of the following events to occur: a net negative change in lung volume with increasing magnitude is detected that is greater than an inspiratory trigger threshold directly after the step of determining that the windowed differential lung volume is about zero; anda predetermined amount of time expires. 19. A computer-readable medium having computer-executable instructions for performing a method of ventilating a patient with a ventilator, the method comprising: repeatedly delivering a fixed base flow that is undeterminable;repeatedly determining a stable portion of exhalation;repeatedly monitoring an exhalation flow during the stable portion of exhalation;repeatedly estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; andrepeatedly triggering inspiration based on the first of at least one of the following events to occur: a flow derivation based on the estimated base flow is detected that is greater than an inspiratory trigger threshold during the stable portion of exhalation; andexpiration of a predetermined amount of time. 20. A ventilator system, comprising: means for delivering a fixed base flow that is undeterminable;means for determining a stable portion of exhalation;means for monitoring an exhalation flow during the stable portion of exhalation;means for estimating a base flow based on the exhalation flow monitored during the stable portion of exhalation; andmeans for triggering inspiration based on the first of at least one of the following events to occur: a flow derivation based on the estimated base flow is detected that is greater than an inspiratory trigger threshold during the stable portion of exhalation; andexpiration of a predetermined amount of time.
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