Digital sliding pole fast-restore for an electrocardiograph display
US6185450A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jan 26, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for monitoring an electrocardiograph waveform, and for returning an electrocardiograph trace to the middle of a display, such as a chart recorder strip. The monitoring circuit includes an amplifier and a switch for switching the frequency response curve of the monitoring circuit. In a first position, the switch causes the monitoring circuit to have a slow frequency response curve, which allows for accurate monitoring of ECG waveforms. In a second position, the switch causes the monitoring circuit to have a fast frequency response curve, which allows the amplifier of the monitoring circuit to quickly be brought out of saturation. The amplifier of the monitoring circuit becomes saturated when a defibrillation or pace pulse has been applied to a patient who is being monitored. The switch is controlled by a pulse waveform control signal that is provided by a microprocessor. By varying the duty cycle of the control signal, the frequency response curve of the monitoring circuit can be shifted. By changing the duty cycle of the pulse waveform in incremental steps, certain problems can be avoided, such as erroneous QRS detect marks that are otherwise produced. The in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.