Heart beat cumulator
US4223683A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1978 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Oct 30, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0245
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A heart beat cumulator records the number of heart beats occurring in each of a succession of ten minute intervals. An electrical signal of heart activity obtained from electrodes on the subject is amplified and applied to the input of a filter having a pass band of about 15Hz to 25Hz. The output of the filter is fed to a peak follower that provides a reference signal to a comparator which is actuated when the amplitude of the output of the filter exceeds the amplitude of the reference signal. Upon actuation of the comparator, the comparator emits a heart beat signal and triggers a monostable multivibrator that blocks the input to the comparator for about one third of a second. The heart beat signal is fed to a data counter. After each ten minute interval, measured by an internal electronic clock, the count in the data counter is written into a memory and the memory is then advanced by an address counter to a new address to condition the memory to record the count for the next ten minute interval at the new address.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.