Electronic circuit permitting simultaneous use of stimulating and monitoring equipment
First Claim
1. An electronic circuit for permitting simultaneous use of patient monitoring equipment and body tissue stimulating equipment, comprising:
- (a) first input means for receiving physiologically generated signals from the body of a patient;
(b) second input means for receiving electrical stimulation signals applied to said patient, said electrical stimulation signals being of a substantially higher frequency and amplitude than said physiologically generated signals;
(c) a sample and hold circuit coupled to said first and second input means for temporarily interrupting the transmission of said physiologically generated signal to store a quantity proportional to the amplitude of said physiologically generated signal at a time coincident with the onset of one of said electrical stimulation signals and for resuming the transmission of said physiologically generated signal from a voltage level defined by said quantity following the termination of said electrical stimulation signal; and
(d) an output circuit means coupled to the output terminal of said sample and hold circuit and adapted to be coupled to said patient monitoring equipment for matching the amplitude of the signals appearing at the output terminal of said sample and hold circuit to a level compatible with said patient monitoring equipment.
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Accused Products
Abstract
An electronic interface module for use with patient monitoring equipment which allows use of the monitoring equipment at the same time that the patient is being treated through the application to his body of electrical stimulating pulses or the like. Body contacting leads used to pick up physiologically generated impulses from the body of the patient are coupled through a suitable amplifier to a sample and hold circuit. The interface module also includes means for generating a control pulse at the onset of a body stimulating impulse which control pulse persists for a predetermined time greater than the period of the stimulating impulse. This control pulse is also applied to the sample and hold circuit. The output from the sample and hold circuit (which may be analog or digital in nature) is, in turn, coupled through suitable matching circuitry to the patient monitoring equipment. The interface module thus eliminates the transmission of the stimulating impulses through the body contacting leads to the patient monitoring equipment while permitting the physiological electrical impulses to be transmitted to the monitoring equipment substantially without any significant change in waveform.
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Citations
6 Claims
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1. An electronic circuit for permitting simultaneous use of patient monitoring equipment and body tissue stimulating equipment, comprising:
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(a) first input means for receiving physiologically generated signals from the body of a patient; (b) second input means for receiving electrical stimulation signals applied to said patient, said electrical stimulation signals being of a substantially higher frequency and amplitude than said physiologically generated signals; (c) a sample and hold circuit coupled to said first and second input means for temporarily interrupting the transmission of said physiologically generated signal to store a quantity proportional to the amplitude of said physiologically generated signal at a time coincident with the onset of one of said electrical stimulation signals and for resuming the transmission of said physiologically generated signal from a voltage level defined by said quantity following the termination of said electrical stimulation signal; and (d) an output circuit means coupled to the output terminal of said sample and hold circuit and adapted to be coupled to said patient monitoring equipment for matching the amplitude of the signals appearing at the output terminal of said sample and hold circuit to a level compatible with said patient monitoring equipment. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification