Electrical power amplifier for continuous cardiac output monitoring
First Claim
1. An alternating current electrical power amplifier for supplying alternating current of a selected frequency;
- said power amplifier comprising;
a reference oscillator providing a reference pulse train signal having a frequency which is a multiple of said selected frequency;
divider means for first dividing said reference pulse train signal by a value which is equal to the multiple divided by two to provide a resulting pulse train, and said divider means then dividing said resulting pulse train by two to provide a final square wave pulse train having a 50 percent duty cycle and which toggles between a first higher value and second lower value at said selected frequency; and
switching means for switching electrical power alternatingly at said selected frequency in response to said final pulse train.
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Accused Products
Abstract
A continuous cardiac output monitor a general-purpose monitoring console with local display and communication facilities, and a module removably interfacing with the console to configure the latter for performing continuous cardiac output monitoring. The module includes a switch-mode high efficiency power amplifier for providing electrical heating power at a selected voltage, frequency, and wave form to a heating element of a continuous cardiac output monitoring catheter, which catheter at a distal end portion thereof is immersed in the blood flow of a patient. The catheter effects a temperature transient in the patient'"'"'s blood flow by the controlled application of electrical resistance heating utilizing electrical power from the power amplifier, and this temperature transient is sensed and used to derive a value for the patient'"'"'s cardiac output.
30 Citations
16 Claims
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1. An alternating current electrical power amplifier for supplying alternating current of a selected frequency;
- said power amplifier comprising;
a reference oscillator providing a reference pulse train signal having a frequency which is a multiple of said selected frequency; divider means for first dividing said reference pulse train signal by a value which is equal to the multiple divided by two to provide a resulting pulse train, and said divider means then dividing said resulting pulse train by two to provide a final square wave pulse train having a 50 percent duty cycle and which toggles between a first higher value and second lower value at said selected frequency; and switching means for switching electrical power alternatingly at said selected frequency in response to said final pulse train. - View Dependent Claims (2, 3, 4, 5, 6)
- said power amplifier comprising;
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7. An amplifier for supplying alternating current at a predetermined frequency, said amplifier comprising:
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a reference oscillator providing a reference pulse train having a frequency which is a multiple of the predetermined frequency; a divider circuit connected to said reference oscillator and receiving said reference pulse train, said divider circuit; dividing said reference pulse train by one-half of said multiple of the predetermined frequency to provide an intermediate pulse train; and dividing said intermediate pulse train by two to provide a final pulse train; said final pulse train having a 50% duty cycle and alternating between a first value and a second value at the predetermined frequency; and a switching circuit connected to said divider circuit and receiving said final pulse train, said switching circuit switching electrical power at the predetermined frequency in response to said final pulse train. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for supplying alternating current at a predetermined frequency, said method comprising the steps of:
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selecting a predetermined frequency; providing a reference pulse train having a frequency which is a multiple of said predetermined frequency; dividing said reference pulse train by one-half of said multiple of said predetermined frequency to provide an intermediate pulse train; dividing said intermediate pulse train by two to provide a final pulse train which has a 50% duty cycle and alternates between a first value and a second value at said predetermined frequency; and switching electrical power at said predetermined frequency in response to said final pulse train. - View Dependent Claims (14, 15, 16)
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Specification