Cardiac instrumentation apparatus with pacer diagnostics Patent #: 4117848
ApplicationNo. 06/025857 filed on 04/02/1979
US Classes:600/508, Heart128/901SUPPRESSION OF NOISE IN ELECTRIC SIGNAL
ExaminersPrimary: Kamm, William E.
Attorney, Agent or Firm
International ClassesA61B 5/04 (20060101)
A61B 5/0408 (20060101)
A61B 5/0424 (20060101)
AbstractAn 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.