Electricity: measuring and testing – Magnetic – Magnetic field detection devices
Reexamination Certificate
2006-06-02
2009-12-29
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Magnetic
Magnetic field detection devices
C607S027000, C600S011000
Reexamination Certificate
active
07639006
ABSTRACT:
A handheld detector gives a warning when a magnetic field exceeds the safety level for a particular medical implant that is magnetically activated. A front surface of the device corresponds approximately to a surface region of a patient's body in a vicinity of an implanted medical device. The magnetic detection element is located at substantially the same distance from the front surface as the control element of the medical device is from the surface region of the patient's body when the device is implanted. The detector element may be activated by a magnetic pressure, that is the vector cross product of the magnetic flux density (B) of a magnet and the applied magnetic field (H), which is less than the magnetic pressure that activates the control element of the implant device. An electronic circuit connected to the detection element may be used to indicate activation of the detection element.
REFERENCES:
patent: 4260949 (1981-04-01), Dalton, Jr.
patent: 4622644 (1986-11-01), Hansen
patent: 5128641 (1992-07-01), Posey
patent: 6984978 (2006-01-01), Wan et al.
Fox Rothschild LLP
LeDynh Bot L
Woodbridge Richard C.
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