Respirator
First Claim
1. A volume-cycled respirator system for delivering a controlled volume of gas to a patient, the system comprising:
- a. displaceable gas delivery means having a position which is adjustable for forcing periodically a volume of gas under pressure into the lungs of a patient throughout an inspiratory period of a respiratory cycle;
b. drive means operatively connected to the gas delivery means to displace the volume of gas to be delivered;
c. means for generating a reference signal representing variations in the position of the gas delivery means with respect to time throughout the inspiratory period necessary to deliver a desired volume of gas in accordance with a desired volume-versus-time waveform; and
d. closed loop feedback means for controlling the instantaneous position of the gas delivery means throughout the inspiratory period, the closed loop feedback means including
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Accused Products
Abstract
A volume-cycled respirator including a piston driven by a translational motor in a feedback control system for forcing a controlled volume of gas into the lungs of a patient throughout each inspiratory cycle. A waveform generator produces a volume-versus-time waveform representing the desired volume of gas to be delivered to the patient throughout each inspiratory cycle. The feedback loop includes a position transducer responsive to the changing position of the piston for producing a volume-versus-time waveform representing the actual volume of gas delivered to the patient throughout each inspiratory cycle. The desired waveform is compared with the actual waveform to produce an error signal which drives the translational motor so it forces the piston travel waveform to follow the desired waveform.
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Citations
31 Claims
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1. A volume-cycled respirator system for delivering a controlled volume of gas to a patient, the system comprising:
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a. displaceable gas delivery means having a position which is adjustable for forcing periodically a volume of gas under pressure into the lungs of a patient throughout an inspiratory period of a respiratory cycle; b. drive means operatively connected to the gas delivery means to displace the volume of gas to be delivered; c. means for generating a reference signal representing variations in the position of the gas delivery means with respect to time throughout the inspiratory period necessary to deliver a desired volume of gas in accordance with a desired volume-versus-time waveform; and d. closed loop feedback means for controlling the instantaneous position of the gas delivery means throughout the inspiratory period, the closed loop feedback means including - View Dependent Claims (3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31)
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- 2. first means responsive to the actual position of the gas delivery means for generating a position feedback signal representing the actual volume of gas displaced by the gas delivery means with respect to time throughout the inspiratory period,second means responsive to said reference signal and said position feedback signal for providing throughout the inspiratory period a position error signal representing the deviation between the instantaneous desired position and the corresponding actual position of the gas delivery means, andthird means for applying said position error signal to the drive means for adjusting the instantaneous position of the gas delivery means in proportion to said error signal throughout the inspiratory period to deliver gas to the patient in accordance with the desired volume-versus-time waveform.
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18. A volume-cycled respirator system for delivering a controlled volume of gas to a patient, the system comprising:
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a. linearly displaceable gas delivery means having a position which is adjustable for forcing periodically a volume of gas under pressure into the lungs of a patient throughout an inspiratory period of a respiratory cycle; b. a translational motor having an input for being converted into translational motion of an output shaft of the motor for linearly positioning the gas delivery means to displace the volume of gas to be delivered; c. means for generating a reference signal representing variations in the position of the gas delivery means with respect to time throughout the inspiratory period necessary to deliver a desired volume of gas in accordance with a desired volume-versus-time waveform; and d. closed loop feedback means for controlling the position of the gas delivery means throughout the inspiratory period, the closed loop feedback means including 1. a position transducer responsive to the actual position of the gas delivery means to produce a position feedback signal representing the actual volume of gas displaced by the gas delivery means with respect to time throughout the inspiratory period, 2. means for comparing said reference signal with said position feedback signal to produce throughout the inspiratory period a position error signal representing the deviation between the instantaneous desired position and the corresponding actual position of the gas delivery means, and
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19. means for applying said position error signal to the input of the translational motor for adjusting the instantaneous position of the gas delivery means in proportion to said error signal throughout the inspiratory period to deliver gas to the patient in accordance with the desired volume-versus-time waveform.
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28. A method for delivering a controlled volume of gas to a patient from a displaceable gas delivery means for forcing periodically a volume of gas under pressure into the lungs of the patient throughout an inspiratory period of a respiratory cycle, in which the cycling of the gas delivery means is controlled by drive means for positioning the gas delivery means to displace the volume of gas delivered to the patient, the method comprising the step of:
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a. generating a reference signal representing variations in the position of the gas delivery means with respect to time throughout the inspiratory period necessary to deliver a desired volume of gas to the patient in accordance with a desired volume-versus-time waveform; b. sensing throughout the inspiratory period the instantaneous actual position of the gas delivery means; c. generating, in response to said sensed instantaneous position, a position feedback signal representing the actual volume of gas displaced by the gas delivery means throughout the inspiratory period; d. generating, in response to said reference signal and said position feedback signal, a position error signal representing the deviation between the instantaneous desired position and the corresponding actual position of the gas delivery means throughout the inspiratory period; and e. applying the error signal to the drive means to adjust the instantaneous position of the gas delivery means in proportion to said error signal to deliver gas to the patient throughout the inspiratory period in accordance with the desired volume-versus-time waveform.
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Specification