Device for automatically detecting lung function variability
US12419537B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2019 |
| Grant date | Sep 23, 2025 |
| Priority date | — |
| Expiry date | Sep 7, 2041 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0261
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for detecting and quantifying lung function includes a piezoelectric sensor configured for attachment to a mammalian chest wall and to feed signals to an ADC providing digitized signals to a processor. The processor firmware extracts inspiration and expiration times from the digitized signals and generates an I/E ratio from them. The processor has firmware to detect wheezing sounds in the signals. The device has an analog event detector configured to wake-up the processor upon detection of candidate wheeze sounds in the signals. In embodiments, the analog event detector includes bandpass filters coupled to a modeling circuit feeding a correlation circuit, the filters having bandpass adjusted by feedback from a circuit within the analog event detector. In an embodiment, the device uses an FFT with a gated recurrent unit (GRU) with partial reset (GRUPR) neural network to detect wheezes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.