Source: http://www.google.com/patents/US6488890?dq=U.S.+Patent+%23+5,723,324
Timestamp: 2016-12-10 13:57:12
Document Index: 113709592

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1']

Patent US6488890 - Machine readable sterilization indicator for monitoring articles to be ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA sterilization indicator having sterilizing agent sensitive indicia is described. The indicator allows a sterilization cycle to be monitored without the need for a user to subjectively distinguish between color, quality or intensity of display patterns....http://www.google.com/patents/US6488890?utm_source=gb-gplus-sharePatent US6488890 - Machine readable sterilization indicator for monitoring articles to be sterilizedAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6488890 B1Publication typeGrantApplication numberUS 09/368,742Publication dateDec 3, 2002Filing dateAug 5, 1999Priority dateAug 5, 1999Fee statusPaidAlso published asCA2378254A1, EP1202752A1, WO2001010472A1Publication number09368742, 368742, US 6488890 B1, US 6488890B1, US-B1-6488890, US6488890 B1, US6488890B1InventorsSteven S. KirckofOriginal Assignee3M Innovative Properties CompanyExport CitationBiBTeX, EndNote, RefManPatent Citations (105), Non-Patent Citations (16), Referenced by (96), Classifications (14), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMachine readable sterilization indicator for monitoring articles to be sterilized
US 6488890 B1Abstract
a) after exposure to a previously stabilized condition of dry heat at 140 degrees Celsius (plus or minus two degrees Celsius) for 30 minutes (plus or minus one minute), the sterilization indicator shows either no change or a change that is markedly different from the change occurring after exposure to the steam sterilization process; and b) the second indication shall not occur until the sterilization indicator has been exposed to saturated steam for not less than 2 minutes at 121 degrees Celsius (+3/−0 degrees Celsius); and c) the second indication shall occur after the sterilization indicator is subjected to saturated steam for not more than 10 minutes at 121 degrees Celsius (+3/−0 degrees Celsius). 15. A sterilization indicator according to claim 1 wherein said sterilizing agent sensitive means is adapted for use in a predetermined steam sterilization process and is selected so that the sterilization indicator satisfies the 134 degree Celsius test defined in Section 6.1 of Sterilization of Health Care Products—Chemical Indicators—Part 1: General Requirements, ANSI/AAMI ST 60—(1996) (referencing the test methods described in ANSI/AAMI ST 45—1992, Bier/Steam vessels) in that:
a substrate having a surface, sterilizing agent sensitive ink sized and shaped in at least a portion of a bar code, said sterilizing agent sensitive ink being adapted provide a first indication to the code reader prior to the sterilization indicator being exposed to a sterilization process, and a second indication to the code reader after the sterilization indicator is exposed to at least a portion of the sterilization process, and wherein the first indication is different than said second indication. 28. A chemical indicator according to claim 27 wherein said sterilizing agent sensitive ink is adapted for use in a predetermined steam sterilization process and is selected so that the sterilization indicator satisfies the 134 degree Celsius test defined in Section 6.1 of Sterilization of Health Care Products—Chemical Indicators—Part 1: General Requirements, ANSI/AAMI ST 60—(1996) (referencing the test methods described in ANSI/AAMI ST 45—1992, Bier/Steam vessels) in that:
In a first embodiment, the processor may be programmed to respond to the remaining relative intensity of λ0. This threshold value (a) (see equation below) should correspond to a suitable decrease in the initial color to represent an “accept” cycle of the sterilizer. That is: IF   ( RI 0 , initial - RI 0 , final RI 0 , initial ) ≤ a , THEN   “ ACCEPT ”   o   r   “ ADEQUATE ” IF   ( RI 0 , initial - RI 0 , final RI 0  , initial ) > a , THEN   “ REJECT ”   o   r   “ INADEQUATE ” In a second embodiment, the processor may be programmed to respond to the increase of relative intensity of λ1. The threshold value (b) (see equation below) should correspond to a suitable increase in the final color to represent an “accept” cycle of the sterilizer. That is: IF   ( RI 1  finall - RI 1 , initial RI 1  finall ) ≤ b , THEN   “ ACCEPT ”   o   r   “ ADEQUATE ” IF   ( RI 1  finall - RI 1 , initial RI 1  finall ) > b , THEN   “ REJECT ”   o   r   “ INADEQUATE ” In yet another embodiment, a combination of the two factors can be implemented: ( IF   ( RI 0 , initial - RI 0 , final RI 0   initial ) ≤ a )   AND   ( IF  ( RI 1  finall - RI 1 , initial RI 1  finall ) ≤ b ) , THEN   “ ACCEPT ”   o   r   “ ADEQUATE ” ( IF   ( RI 0 , intial - RI 0 , final RI 0 , initial ) > a )   OR   ( IF  ( RI 1  finall - RI 1 , initial RI 1  finall ) > b ) , THEN   “ REJECT ”   o   r   “ INADEQUATE ” Yet another embodiment includes the step of integrating the relative intensities over a range of wavelengths surrounding the initial and final colors instead of using two discrete wavelength values. Other mathematical correlations of these parameters could be used to maximize sensitivity and increase the safety margin.
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A61L2/14Cooperative ClassificationA61L2/28European ClassificationA61L2/28Legal EventsDateCodeEventDescriptionAug 5, 1999ASAssignmentOwner name: 3M INNOVATIVE PROPERTIES COMPANY, MINNESOTAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIRCKOF, STEVEN S.;REEL/FRAME:010161/0447Effective date: 19990805Jun 5, 2006FPAYFee paymentYear of fee payment: 4May 7, 2010FPAYFee paymentYear of fee payment: 8May 7, 2014FPAYFee paymentYear of fee payment: 12RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services