Artificial cardiac pacemaker
US4148320A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Jan 21, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3712
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An artificial cardiac pacemaker for use with a heart comprises an output feedback preventing circuit for applying stimulating output pulses developed by the pacemaker to a heart while preventing the pulses from being fed back into the pacemaker and for detecting cardiac signals from the heart. A selective converter circuit is connected to the output feedback preventing circuit and functions to convert negative cardiac signals from the heart into positive signals and apply the signals to a low pass filter circuit which filters the signals to eliminate high frequency noise. A resettable circuit for the refractory period is connected to receive the filtered signals and establishes a predetermined refractory period after each QRS signal from the heart and provides a corresponding trigger signal to a delay circuit which responds thereto to provide a trigger pulse after a predetermined time delay. A generator circuit is connected to the delay circuit and responds to the trigger pulses to accordingly generate output pulse signals. An output stimulating circuit has an input connected to the generator circuit and an output connected to the output feedback preventing circuit and is driven by…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.