Pressure actuated exposure mechanism for sterilant indicator

Details Pressure actuated exposure mechanism for sterilant indicator Pressure actuated exposure mechanism for sterilant indicator

1997-08-04

1998-08-04

Alexander, Lyle A.

Chemistry: analytical and immunological testing

Process or composition for sterility or package integrity test

422 58, 422 85, 422 87, 436164, 436169, G01N 3122

Patent

active

057891753

ABSTRACT:
A sheet of chemically sensitive paper (54) that exhibits a measurable change in a physical property, such as color, when exposed to a chemical environment is inserted between two sections (20, 22) such that an area of the paper is exposed to the chemical environment through an opening (46) in the upper section. The lower section is connected to a piston (14) that is located in a chamber (10) such that an area at the top of the chamber is sealed by the piston. The piston responds to changes in pressure by moving within the chamber. As it does so, a ratchet mechanism (30) causes the upper and lower sections to rotate one step relative to each other. With each rotational step, a new area of the chemically sensitive paper is exposed to the chemical environment through the opening in the upper section. In this manner, a record of a series of chemical exposures is obtained.

REFERENCES:
patent: 3258312 (1966-06-01), Olson et al.
patent: 3568627 (1971-03-01), Selinger et al.
patent: 4145186 (1979-03-01), Anderson

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