Personal motion event monitor

Details Personal motion event monitor Personal motion event monitor

1997-08-11

1999-03-09

O'Connor, Carey E.

Surgery

Diagnostic testing

Sensitivity to vibration

600595, A01B 500

Patent

active

058793097

ABSTRACT:
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.

REFERENCES:
patent: 5008654 (1991-04-01), Callaway
patent: 5146206 (1992-09-01), Callaway
patent: 5247939 (1993-09-01), Sioquist et al.

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