초록 ▼

A system which is capable of simultaneously displaying a plurality of waveforms on the face of a CRT which are representative of ECG, arterial pressures and operating states of the mechanical heart assistance devices, as well as a “timing bar”which sweeps across the CRT face in synchronism with the

A system which is capable of simultaneously displaying a plurality of waveforms on the face of a CRT which are representative of ECG, arterial pressures and operating states of the mechanical heart assistance devices, as well as a “timing bar”which sweeps across the CRT face in synchronism with the ECG trace, for example. Optical pickups are slidably mounted adjacent the CRT face across the path of the “timing bar”sweep for activating photodetectors which in turn initiate inflation and deflation of mechanical assistive devices at any desired point along the ECG or pressure trace. Any one of the pressure or ECG traces may be “frozen”on the display face to facilitate comparison between a trace of the condition of the heart prior to the use of heart assistance and a trace of the augmented condition. All traces may be freely moved to any location upon the display face so as to permit close positioning and even superimposition of two or more traces to still further facilitate visual comparisons. The “timing bar”may also be utilized to provide an electrical pacing assist for controlling patient heart rate as well as for extending the heart refractory period enabling the assistance devices to operate at reduced rates. Means are provided for presenting “frozen”and regular traces at different display intensities.

대표청구항 ▼

Display means for displaying at least two signals as traces on a display which contrast with one another to enhance the viewing thereof comprising: a cathode ray tube (CRT) having a display face, an electron beam generating means, a control grid and a cathode and first and second deflection means fo

Display means for displaying at least two signals as traces on a display which contrast with one another to enhance the viewing thereof comprising: a cathode ray tube (CRT) having a display face, an electron beam generating means, a control grid and a cathode and first and second deflection means for deflecting an electron beam generated by said electron beam generating means; first and second ramp generating means for generating ramp signals and being respectively coupled to said first and second deflection means; clock means for resetting said first ramp generating means at a first predetermined rate; divider means coupled to said clock means for resetting said second ramp generating means at a second predetermined rate which is 1/nth said first rate; a plurality of comparator means at least equal in number to the number of signal traces adapted to be simultaneously displayed on said tube face, said comparator means having first and second inputs and an output for generating a signal when the signals at said first and second inputs are substantially equal; third ramp generating means operated by said clock means in synchronism with said first ramp generating means and being coupled to one input of each of said comparators; summing circuit means having first and second inputs and an output coupled to the remaining input of its associated comparator means; each signal to be displayed being coupled to one input of an associated one of said summing circuit means; adjustable signal level means for coupling an adjustable d.c. level to the second input of each of said summing circuit means whereby the signal at said first input controls the size and shape of said trace and wherein the d.c. level at said second input controls the position of the trace on the display face; means coupled between each of said comparator means and said cathode and control grid of said CRT and responsive to said signal at the output of said comparator means to render said control grid sufficiently positive relative to said cathode to unblank the CRT electron beam.