Surgical implement detector
US7420468B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 9, 2005 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Sep 11, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B90/98
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Provided is a detector system for detecting a plurality of items each having at least one RFID tag attached thereto. The detector system may include a presence detector and/or a message detector. The presence detector may include a signal reader which receives modulated carrier frequencies from the RFID tags during a predetermined response time period for comparison to a reference level. The signal reader may be configured as a power integrator or a constellation discriminator. The power integrator sums the power contained in signals transmitted by the RFID tags by integration for comparison to an environmental noise level measurement taken during a quiet period. For the constellation discriminator, bits contained in the modulating message are compared to the bit pattern of a predetermined reference constellation. The detector system may be configured as a 3-state detector which combines the presence detector with a message detector that indicates the identification code of the RFID tags.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.