Control of life support systems
DC CAFCFirst Claim
1. Apparatus for controlling the flow of a biological fluid to an organ, which comprises:
- means for establishing a pattern of variations over time of instantaneous changes in flow of a biological fluid to an organ of a mammalian species,means for generating a variable control parameter for regulation of flow of the biological fluid to an organ in accordance with the pattern, andmeans for controlling the flow of the biological fluid to the organ in accordance with the variable control parameter.
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Abstract
The flow of a biological fluid to an organ is computer-controlled so that the natural variation of such flow is simulated. Specifically described are control of a blood pump flow output during CPB to mimic normal pulsatile blood flow from the heart and control of a ventilator output to mimic normal breathing of healthy lungs. A pattern of variation over time of instantaneous flow of a biological fluid to an organ of a mammalian species is established, a variable control parameter for regulation of flow of the biological fluid to the organ is generated in accordance with the pattern, and the flow of biological fluid to the organ is controlled in accordance with the variable control parameter.
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Citations
2 Claims
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1. Apparatus for controlling the flow of a biological fluid to an organ, which comprises:
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means for establishing a pattern of variations over time of instantaneous changes in flow of a biological fluid to an organ of a mammalian species, means for generating a variable control parameter for regulation of flow of the biological fluid to an organ in accordance with the pattern, and means for controlling the flow of the biological fluid to the organ in accordance with the variable control parameter.
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2. An apparatus for controlling the flow of blood by a pump to a body during cardiopulmonary by-pass, which comprises:
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means for establishing a predetermined pattern of variation over time of instantaneous blood pressure and heart rate of an independently-functioning heart of a mammalian species; means for generating a signal corresponding in value to an individually-determined blood pressure for a period of time corresponding to the heart rate for a difference between such individually-determined blood pressure and the next individually-determined blood pressure of said predetermined pattern; means for generating a control voltage corresponding in magnitude to said signal; and means for applying said control voltage to said pump to provide an output of blood from said pump to the body during cardiopulmonary bypass of a pressure proportional to the magnitude of the signal for said period of time; and means for repeating the steps of generating a signal, generating a control voltage and applying the control voltage to the pump for each next individually-determined blood pressure of said predetermined pattern.
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Specification