Exhalation valve stabilizing apparatus
First Claim
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1. A lung ventilation system employing a variably positionable exhalation valve wherein the position of said valve is determinative of the rate of venting of respiratory gases from said system, comprising:
- means for repositioning said valve to compensate for deviations of system pressure from a preselected value; and
means for damping the rate of such repositioning at a variable rate,wherein the repositioning of said valve is damped as a function of the product of a signal representative of the rate of repositioning and of a signal related to the instantaneous value of a pneumatic variable.
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Abstract
The movements of an exhalation valve are damped at a variable rate to control pressure oscillations within a ventilation system. The exhalation valve is damped as a function of its velocity at a rate that is a function of a variable linked to the pneumatic state of the system, to provide a feedback signal to the valve driver.
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Citations
19 Claims
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1. A lung ventilation system employing a variably positionable exhalation valve wherein the position of said valve is determinative of the rate of venting of respiratory gases from said system, comprising:
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means for repositioning said valve to compensate for deviations of system pressure from a preselected value; and means for damping the rate of such repositioning at a variable rate, wherein the repositioning of said valve is damped as a function of the product of a signal representative of the rate of repositioning and of a signal related to the instantaneous value of a pneumatic variable.
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2. A lung ventilation system employing a variably positionable exhalation valve wherein the position of said valve is determinative of the rate of venting of respiratory gases from said system, comprising:
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means for repositioning said valve to compensate for deviations of system pressure from a preselected value; and means for damping the rate of such repositioning at a variable rate, wherein the repositioning of said valve is damped as a function of the product of a signal representative of the rate of repositioning and of a signal related to the instantaneous value of a pneumatic variable, wherein said pneumatic variable comprises system pressure.
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3. A lung ventilation system employing a variably positionable exhalation valve wherein the position of said valve is determinative of the rate of venting of respiratory gases from said system, comprising:
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means for repositioning said valve to compensate for deviations of system pressure from a preselected value; and means for damping the rate of such repositioning at a variable rate, wherein the repositioning of said valve is damped as a function of the product of a signal representative of the rate of repositioning and of a signal related to the instantaneous value of a pneumatic variable. wherein said pneumatic variable comprises gas flow.
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4. A lung ventilation system employing a variably openable exhalation valve for controlling the venting of respiratory gas from said system, comprising:
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means for generating a command signal for effecting a variation in said valve opening in order to adjust system pressure to a preselected level; valve opening varying means responsive to an actuation signal; velocity transducing means for measuring the variation rate of said exhalation valve opening and generating a signal representative thereof; pneumatic variable transducing means for measuring the value of a preselected pneumatic variable and generating a signal representative thereof; means for modulating said velocity signal with a signal proportional to said pneumatic variable, to yield a damping signal; and means for combining said command signal with said damping signal to yield said actuation signal. - View Dependent Claims (5, 6, 7)
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8. A lung ventilation system, comprising:
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an exhalation valve for venting respiratory gas from said system including a poppet and seat arrangement wherein said poppet is biased away from said seat and a valve closing means is provided, operative to drive said poppet toward said valve seat in response to a variable degree of energization of said valve closing means; means for generating a velocity signal representative of the velocity of said poppet; means for generating a pneumatic variable signal representative of the instantaneous value of such variable; means for modulating said velocity signal with a value proportional to said pneumatic signal to yield a damping signal; means for modifying the degree of energization with said damping signal so as to damp the movement of the poppet whereby pressure fluctuations relative a preselected pressure level within said system are damped. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A lung ventilation system employing a variably positionable exhalation valve wherein the position of said valve is determinative of the rate of venting of respiratory gases from said system, comprising:
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means for repositioning said valve to compensate for deviations of system pressure from a preselected value; and means for damping the rate of repositioning of said valve at a variable rate, wherein said rate of damping is a function of the rate of repositioning and a damping value, said damping value being a function of a pneumatic variable. - View Dependent Claims (17, 18, 19)
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Specification