(12) United States Patent ao) Patent No.: Us 7,667,606 B2
Packert et al. (45) Date of Patent: Feb. 23,2010
(51) Int. CI.
G08B 23/00 (2006.01)
(52) U.S. CI 340/573.1; 340/572.1; 340/572.4;
340/539.13; 340/539.16; 340/539.17; 340/825.49;
(58) Field of Classification Search 340/572.1,
340/572.4, 573.1, 539.1, 539.13, 539.16, 340/539.17, 539.21, 825.49, 825.69 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
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6,571,128 B2* 5/2003 Lebeletal 607/60
6,954,148 B2* 10/2005 Pulkkinen et al 340/572.1
7,448,544 Bl * 11/2008 Louie etal 235/385
Activities of individuals and the movements/usage of products are monitored in an operating room during a surgical procedure by disposing in the operating room a first transceiver operating in a long wavelength mode in which 99.99% or more of radiated energy is in the form of a magnetic field, for example 131 KHz. A distinguishable radio frequencyenabled identification tag is associated with each of a plurality of persons assigned to the surgical procedure, including for example, doctors, nurses, and/or the patient, and optionally with products to be monitored. A signal is transmitted from the first transceiver and responses from the identification tags are monitored. A log is created from the monitored responses indicative activities of each of the persons in the operating room or of movements of tagged products.
11 Claims, 5 Drawing Sheets