Circuit and method for the radiotelemetry of esophageal pH in an ECG radiotelemetry system
First Claim
1. A circuit for radiotelemetry of an esophageal pH signal in an electrocardiogram (ECG) signal radiotelemetry system, comprising:
- means for monitoring esophageal pH and generating a signal proportional thereto;
waveform converter means for receiving said signal from said means for monitoring esophageal pH and converting the same to a signal whose waveform is similar to an ECG waveform and one of whose electrical parameters is proportional to esophageal pH;
transmitter means for receiving said converted signal from said waveform converter means and broadcasting the same upon a radio frequency carrier;
receiver and demodulator means for receiving said broadcast signal and demodulating the same to obtain said converted signal similar to an ECG waveform; and
,display means receiving said demodulated, converted signal whose waveform is similar to an ECG waveform and displaying indicia of esophageal pH.
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Abstract
A circuit and method for radiotelemetry of an esophageal pH signal in an electrocardiogram (ECG) signal radiotelemetry system includes esophageal and reference pH electrodes (16 and 17) connected to a pH meter (15) for monitoring esophageal pH and generating a signal proportional thereto and a waveform converter circuit (12) for converting the same to a signal whose waveform is similar to an ECG waveform and one of whose parameters, such as frequency, is proportional to esophageal pH. A conventional ECG radiotelemetry system (13) includes an ECG signal transmitter (31) receiving and broadcasting the converted signal to a remote ECG signal receiver (32). A display (14) receives the demodulated converted waveform from ECG signal receiver (32) and displays indicia of esophageal pH.
61 Citations
12 Claims
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1. A circuit for radiotelemetry of an esophageal pH signal in an electrocardiogram (ECG) signal radiotelemetry system, comprising:
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means for monitoring esophageal pH and generating a signal proportional thereto; waveform converter means for receiving said signal from said means for monitoring esophageal pH and converting the same to a signal whose waveform is similar to an ECG waveform and one of whose electrical parameters is proportional to esophageal pH; transmitter means for receiving said converted signal from said waveform converter means and broadcasting the same upon a radio frequency carrier; receiver and demodulator means for receiving said broadcast signal and demodulating the same to obtain said converted signal similar to an ECG waveform; and
,display means receiving said demodulated, converted signal whose waveform is similar to an ECG waveform and displaying indicia of esophageal pH. - View Dependent Claims (2)
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3. A circuit for radiotelemetry of an esophageal pH signal in an electrocardiogram (ECG) signal radiotelemetry system, comprising:
- p1 means for monitoring esophageal pH and generating a D.C. signal whose voltage magnitude is proportional to esophageal pH;
waveform converter means for receiving said D.C. signal from said means for monitoring esophageal pH and converting the same to a signal whose waveform is similar to an ECG waveform and one of whose electrical parameters is proportional to esophageal pH, said waveform converter means including voltage controlled oscillator (VCO) means for receiving said D.C. signal from said means for monitoring esophageal pH and generating a square-wave whose frequency is proportional to said voltage magnitude of said D.C. signal from said means for monitoring esophageal pH, and waveshaping filter means for receiving said square-wave from said VCO means and converting the same into a signal waveform similar to that of an ECG waveform; transmitter means for receiving said converted signal from said waveform converter means and broadcasting the same upon a radio frequency carrier; receiver and demodulator means for receiving said broadcast signal and demodulating the same to obtain said converted signal similar to an ECG waveform; and
,display means receiving said demodulated, converted signal whose waveform is similar to an ECG waveform and displaying indicia of esophageal pH. - View Dependent Claims (4, 5, 6)
- p1 means for monitoring esophageal pH and generating a D.C. signal whose voltage magnitude is proportional to esophageal pH;
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7. A method for radiotelemetry of an esophageal pH signal in an electrocardiogram (ECG) signal radiotelemetry system, comprising the steps of:
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monitoring esophageal pH including the step of generating a signal proportional to the instantaneously measured esophageal pH; converting said signal proportional to the instantaneously measured esophageal pH to a signal whose waveform is similar to an ECG waveform and one of whose electrical parameters is proportional to esophageal pH; broadcasting said converted signal upon a radio frequency carrier; receiving and demodulating said broadcast signal to obtain said converted signal whose waveform is similar to an ECG waveform; and
,displaying indicia of the instantaneous esophageal pH. - View Dependent Claims (8)
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9. A method for radiotelemetry of an esophageal pH signal in an elecatrocardiogram (ECG) signal radiotelemetry system, comprising the steps of:
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monitoring esophageal pH including the steps of placing an esophageal pH electrode in a patient'"'"'s esophagus, attaching a reference pH electrode to said patient'"'"'s skin, and generating a D.C. signal whose voltage magnitude is proportional to said instantaneously measured esophageal pH; converting said signal proportional to the instantaneously measured esophageal pH to a signal whose waveform is similar to an ECG waveform and one of whose electrical parameters is proportional to esophageal pH, said step of converting including the steps of generating a squarewave whose frequency is proportional to said voltage magnitude of said D.C. signal, and shaping said squarewave into a signal waveform similar to that of an ECG waveform; broadcasting said converted signal upon a radio frequency carrier; receiving and demodulating said broadcast signal to obtain said converted signal whose waveform is similar to an ECG waveform; and
,displaying indicia of the instantaneous esophageal pH. - View Dependent Claims (10, 11, 12)
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Specification