Autoclave cycle monitor for autoclaved instruments

Details Autoclave cycle monitor for autoclaved instruments Autoclave cycle monitor for autoclaved instruments

1998-08-26

2000-12-26

Strecker, Gerard

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324219, 324224, 324235, 324239, 324261, 324 711, 422119, 600117, G01N 2772, G01R 3312, A61B 100

Patent

active

06166538&

ABSTRACT:
An electronic autoclave cycle passively records the number of thermal cycles to which an instrument has been subjected in a steam autoclave. When a sterilization cycle has been completed, and the instrument is next energized in use, a microprocessor is employed to read the sensor and record the occurrence of a sterilization cycle. Information as to the cumulative number of cycles through which the instrument has been subjected is stored in a non-volatile memory. This data is suitably displayed on a display panel. The sensor employed uses either the Curie temperature or a temperature near but below the Curie temperature of a ferromagnetic material by first magnetizing the material and then, later, checking its flux density to determine whether a thermal cycle has occurred. In a first embodiment, a Hall effect sensor is used to directly measure the magnetic field strength of the magnetizable material. In a second embodiment, a sensor winding is used to sense the magnetic field strength of the magnetizable material. The sensor winding is interconnected with an amplifier so that changes in flux can be sensed.

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