Cardiac/respiratory arrest detector
US6821254B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2001 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Jun 15, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/05
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The condition of a patient who has signs of cardiopulmonary arrest, is evaluated by applying a pair of electrodes (12, 14) to the chest of the patient and passing a low level of alternating current through the patient to detect changes in transthoracic impedance which represent cardiopulmonary activity of the patient. An analyzing circuit determines the average frequency of those signals (40) representing heartbeat rate impedance and determines the average frequency of signals (42) representing breathing of the patient. When the heart rate is below about 20 beats per minutes, the respiratory rate is below about 4 breaths per minute, and cardiac and respiratory impedances are below 0.01 ohms, this indicates cardiac arrest of the patient and signifies that CPR (cardiopulmonary resuscitation) should start.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.