[특허]Method and apparatus for rapid control of set inspired gas concentration in anesthesia delivery systems

Method and apparatus for rapid control of set inspired gas concentration in anesthesia delivery systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61M-015/00
출원번호	US-0170168 (1998-10-13)
발명자 / 주소	Keitel Todd A. Tham Robert Q.
출원인 / 주소	Datex-Ohmeda, Inc.
대리인 / 주소	Andrus, Sceales, Starke & Sawall, LLP
인용정보	피인용 횟수 : 31 인용 특허 : 17

초록 ▼

A method and system for rapid control of set inspired gas concentration is disclosed for operating a medical anesthesia delivery system and for controlling the flow and concentration of gases and anesthesia vapor delivered to a patient. Control of the inspired gas and agent concentration is accomplished by operating in different control priority modes. In a flow priority control mode, the user may set, either directly or indirectly, the total fresh gas flow rate. The total fresh gas flow rate can then be slowly be varied by the control algorithm, while the vaporizer concentration is actively controlled to achieve the user set inspired gas concentration. The invention includes a process for switching from the flow priority control mode into a concentration priority mode for low flow rates. By throttling the flow, the patient will receive nearly an instantaneous change in the amount of agent and fresh gas without having the transport delay associated with a change in the agent concentration. Sensors are used to monitor agent concentration and minute volume, and a processor is programmed to estimate the concentration of the agent in the pipeline to select the control priority mode, and control the agent vaporizer and the fresh gas flow controller to selectively switch between control priority modes and operate extremely efficiently while in the concentration priority mode by changing the flow rate instead of the agent concentration.

대표청구항 ▼

[ We claim:] [1.]1. An anesthetic agent delivery system for delivering a desired dose of anesthetic agent to a patient comprising:an anesthetic agent supply having a controller for controlling the amount of anesthetic agent provided by the supply;a gas supply for providing respiratory gas, said gas supply being in fluid communication with said anesthetic agent supply to receive the anesthetic agent from said anesthetic agent supply to form fresh gas, said gas supply having a gas flow controller for controlling the fresh gas flow rate;a breathing circuit containing and recirculating breathing gas for the patient, said breathing circuit having a supply end and a patient end that is in communication with the patient, said breathing circuit being formed such that a gas volume displacement at the supply end will cause a rapid, corresponding volume displacement at the patient end, said supply end being in communication with the gas supply and the anesthetic agent supply to receive fresh gas into the breathing circuit, the breathing circuit providing a minute volume of breathing gas to the patient;a sensor connected in the breathing circuit to provide a signal indicative of the anesthetic agent concentration delivered to the patient; anda system control connected to the gas flow controller and anesthetic agent supply controller, said system control receiving the signal from said sensor for forming an anesthetic agent concentration error signal indicative of the difference between desired and delivered patient anesthetic agent concentrations, the system control having a plurality of control paths to control the anesthetic agent concentration delivered to the patient, said system control employing, when the fresh gas flow rate is less than or equal to the minute volume, a first control path comprising a feedforward control loop for said anesthetic agent supply for establishing the amount of anesthetic agent provided in the fresh gas by said anesthetic agent supply, and employing a second control path comprising a feedback control loop between said anesthetic agent concentration error signal and said gas flow controller to rapidly and incrementally change the fresh gas flow rate in a manner to rapidly minimize an error between desired and delivered patient anesthetic agent concentrations, said system control having switching means responsive to the fresh gas flow rate to switch from said first and second control paths to third and fourth control paths when the fresh gas flow rate exceeds the minute volume, said third control path comprising a feedforward control loop which is coupled to said gas flow controller for establishing the flow rate of the fresh gas, and said fourth control path comprising a closed, feedback control loop between the anesthetic agent concentration error signal and said anesthetic agent supply controller to vary the amount of anesthetic agent provided by said anesthetic agent supply in the fresh gas in a manner to minimize the error between desired and delivered patient anesthetic agent concentrations.

이 특허에 인용된 특허 (17)

Lekholm Anders (Bromma SEX) Wrd Leif (Dalaro SEX), Anaesthetic system which is automatically switched to temporary operation as an open breathing system upon a change in a.
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Tham Robert Q. (Madison WI) Homuth James R. (DeForest WI), Anesthesia system with CO₂ monitor to suppress CO₂ breakthrough.
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Westenskow Dwayne D. (Salt Lake City UT) Loughlin Patrick J. (Seattle WA) Jaklitsch Roman R. (Lbeck DEX) Wallroth Carl-Friedrich (Lbeck DEX), Anesthesia ventilating apparatus having a breathing circuit and control loops for anesthetic gas components.
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Psaros Georgios,SEX ; Castor Rolf,SEX, Anesthetic administration apparatus which delivers anesthetic in microdroplets.
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Koni Tuyoshi (Tokorozawa JPX) Urushida Yoshihisa (Tokorozawa JPX) Tsuzuki Akira (Tokorozawa JPX), Anesthetic gas control apparatus.
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Rusz Tibor (1508 Tejana Mesa Place N.E. Albuquerque NM 87112), Anesthetic-vapor delivery apparatus with an ambient-referenced pressure regulator.
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Olsson Sven-Gunnar (Arloev SEX) Skog Goeran (Bromma SEX) Dahlstroem Bo (Vaellingby ; SEX) Linden Dan (Stockholm SEX) Cewers Goeran (Lund SEX) Iderup Mats (Malmoe SEX) Rydgren Goeran (Bunkeflostrand S, Apparatus for regulating the flow-through amount of a flowing medium.
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Psaros Georgios (Tullinge SEX) Bergkvist Rune (Vaxholm SEX) Olsson Sven-Gunnar (Arloev SEX), Apparatus for the administration of a respiratory gas and at least one anaesthetic.
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Strowe Robert J. (Summerville SC), Flow control system for anesthesia apparatus.
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Tham Robert Q. ; Keitel Todd ; Bathe Duncan P. L., Method and apparatus for controlling a medical anesthesia delivery system.
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Werner Olof (Stadsbudsgatan 10 S-222 36 Lund SEX) Persson Janne (S-242 92 Horby SEX), Method and apparatus for controlling the concentration of at least one component in a gas mixture in an anaesthetic syst.
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Jonson Bjrn (Lund SEX) Olsson Sven-Gunnar (Arlv SEX), Method and device for reduction of rebreathing of gas from dead space.
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Westenskow ; Dwayne R. ; Johnson ; Curtis C., Oxygen and anesthesia delivery and monitoring device.
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Olesen Russell (Huntington NY), Pop-off gas evacuator valve for anesthesia machine.
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Raemer, Dan, Rapid anesthesia emergence system using closed-loop PCO.sub.2 control.
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Gravenstein Joachim S. (Gainesville FL) Lampotang Samsun (Gainesville FL), Self-contained jet pump breathing apparatus.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Method and apparatus for rapid control of set inspired gas concentration in anesthesia delivery systems 원문보기

초록 ▼

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Method and apparatus for rapid control of set inspired gas concentration in anesthesia delivery systems 원문보기

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대표청구항 ▼

연구과제 타임라인

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이 특허에 인용된 특허 (17)

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