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United States Patent | 5,879,309 |
Johnson , et al. | March 9, 1999 |
A motion detection device for monitoring patient movement. The device includes a sensor adapted to generate a voltage from mechanical vibrations and a circuit in operable relationship with the voltage for generating an alarm upon detection of a predetermined signal. The circuit provides a fixed impedance to the sensor. A micro controller is used for analyzing the signal to select from first and second conditions by sensing activity within sequences of preselected time intervals. The first condition represents a medical condition and the second condition represents casual motion. A switch is used for setting a time interval and a total sampling time for the micro controller. An alarm signal generates an alarm upon detection by the microprocessor of a predetermined activity. The preferred sensor comprises a housing having an outer shell and a hollow spherical opening therein. A plurality of inner spherical bodies are adapted to move freely inside the spherical opening to produce detectable mechanical vibration in the outer shell. A piezoelectric film is attached to a portion of the outer shell to generate a voltage from the mechanical vibrations.
Inventors: | Johnson; Mark A. (Rensselaer, NY), Cote; Paul J. (Clifton Park, NY) |
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Family ID: | 26851354 |
Appl. No.: | 08/919,182 |
Filed: | August 11, 1997 |
Application Number | Filing Date | Patent Number | Issue Date | ||
---|---|---|---|---|---|
805199 | Feb 27, 1997 | ||||
596396 | Feb 12, 1996 | 5610890 | |||
443911 | May 18, 1995 | 5523742 | |||
312853 | Sep 23, 1994 | ||||
154324 | Nov 18, 1993 | ||||
Current U.S. Class: | 600/552; 600/595 |
Current CPC Class: | A61B 5/1126 (20130101); G08B 21/02 (20130101); G01P 13/00 (20130101); A61B 5/4094 (20130101) |
Current International Class: | G01P 13/00 (20060101); A01B 005/00 () |
Field of Search: | ;600/510,552,553,587 |
5008654 | April 1991 | Callaway |
5146206 | September 1992 | Callaway |
5247939 | September 1993 | Sioquist et al. |
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