Portable hand held doppler fetal heart rate probe with selective power settings
First Claim
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1. A probe in a hand held ultrasonic Doppler fetal heart beat detection and monitoring system comprising:
- a crystal for transmitting ultrasonic energy;
a variable power source, connected to said crystal, having a plurality of power settings for driving said crystal at a selected power setting wherein said variable power source comprises a plurality of pairs of power drivers; and
a selection means for selecting a power setting for said variable power source from said plurality of power settings wherein said variable power source comprises a plurality of pairs of power drivers.
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Abstract
A probe in a hand held ultrasonic Doppler fetal heart beat detector and monitoring system comprising a crystal for transmitting ultrasonic energy, a variable power source connected to said crystal for driving the crystal at a selected power setting and a microprocessor for selecting a power setting for the variable power source.
22 Citations
16 Claims
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1. A probe in a hand held ultrasonic Doppler fetal heart beat detection and monitoring system comprising:
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a crystal for transmitting ultrasonic energy; a variable power source, connected to said crystal, having a plurality of power settings for driving said crystal at a selected power setting wherein said variable power source comprises a plurality of pairs of power drivers; and a selection means for selecting a power setting for said variable power source from said plurality of power settings wherein said variable power source comprises a plurality of pairs of power drivers. - View Dependent Claims (2, 3)
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4. A probe in a hand held ultrasonic Doppler fetal heart beat detection and monitoring system comprising:
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a crystal for transmitting ultrasonic energy; a variable power source, connected to said crystal, having a plurality of power settings for driving said crystal at a selected power setting wherein said variable power source comprises a plurality of cascaded pairs of power drivers where each pair of said power drivers is individually selected; and a selection means for selecting a power setting for said variable power source from said plurality of power settings wherein said variable power source comprises a plurality of pairs of power drivers. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operation for a probe in a hand held ultrasonic Doppler fetal heart beat detection and monitoring system where said probe comprises a crystal for transmitting ultrasonic energy a variable power source connected to said crystal for driving said crystal at a selected power setting, a selection means for selecting a power setting for said variable power source, a POWER button monitored by said selection means, said probe having an OFF state, a LOW POWER state and a HIGH POWER state, said method comprising the steps of:
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detecting a non transient signal generated by a first depression of said POWER button; initiating power to said probe; first switching to said LOW POWER state from said OFF state when said POWER button is depressed for a first period of time during said first depression of said power button; second switching to said HIGH POWER state from said LOW POWER state when said POWER button is depressed for a second period of time during said first depression of said POWER button; and third switching from said LOW POWER state and said HIGH POWER state to said OFF state when said POWER button is next depressed after said first depression of said POWER button. - View Dependent Claims (14, 15, 16)
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Specification