Magnetic field detector for a medical device implantable in the

Details Magnetic field detector for a medical device implantable in the Magnetic field detector for a medical device implantable in the

1992-08-24

1994-05-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

73DIG4, 324226, 324260, 607 19, G01R 3302, G01R 33028, A61N 108, A61N 137

Patent

active

053090969

ABSTRACT:
In a known magnetic field detector, an electrical coil (8) is secured to a motion-sensitive, for example piezoelectric sensor (3); this electrical coil is charged with an electrical current for detecting the magnetic field with the sensor (3) and an evaluation means (14) which follows thereupon. In order to also be able to employ the magnetic field detector given arrangement thereof in an implantable medical device as activity sensor for the physical activity of a patient, the current charging of the coil (8) can be switched on and off with a control signal (21), whereby the control signal (21) is utilized for characterizing the sensor signal as an activity signal corresponding to the physical activity or as a detection signal that detects a magnetic field.

REFERENCES:
patent: 3865119 (1975-02-01), Svensson et al.
patent: 4186324 (1980-01-01), Hartzell, Jr.
patent: 4428378 (1984-01-01), Anderson et al.
patent: 4677378 (1987-06-01), Tokura et al.
patent: 4866383 (1989-09-01), Taliaferro
patent: 4887032 (1989-12-01), Hetrick
"A Vibrating Cantiliver Magnetic-Field Sensor," Hetrick, Sensors and Actuators, vol. 16, No. 3, Mar., 1989, pp. 197-207.

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