Detection of pleural effusion using transthoracic impedance
US7340296B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2005 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Jun 24, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36535
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
This patent document discusses systems, devices, and methods for increasing a sensitivity or specificity of thoracic fluid detection in a subject and differentiating between pleural effusion and pulmonary edema. In one example, a thoracic impedance measurement circuit senses a thoracic impedance signal. In another example, a processor receives the thoracic impedance signal and determines whether such thoracic impedance signal is “significant.” A significant thoracic impedance signal indicates the presence of thoracic fluid and may be recognized by comparing the thoracic impedance signal (or variation thereof) to a thoracic impedance threshold. When a significant thoracic impedance signal is recognized, the processor is adapted to detect one or both of: a pleural effusion indication and a pulmonary edema indication using one or a combination of: physiologic information, patient symptom information, and posture information. In another example, the thoracic impedance threshold is adjusted using such physiologic, patient symptom, or posture information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.