Sterilizer

• US 4,307,288 A
• Filed: 01/24/1977
• Issued: 12/22/1981
• Est. Priority Date: 01/24/1977
• Status: Expired due to Term

• Current Assignee: Schering Corporation (Merck & Co., Inc.)
• Original Assignee: Wesley Jessen VisionCare, Inc. (Novartis Ag)
• Inventors: Stine, Orrin B.
• Primary Examiner(s): Garris, Bradley R.
• Application Number:
  US05/762,176
• Time in Patent Office: 1,793 Days
• Field of Search: 21/85, 21/86, 21/89, 21/90, 21/93, 219/521, 219/385, 219/399, 422/109, 422/300, 422/302
• US Class Current: 219/521
• CPC Class Codes: A61L 12/04 Heat A61L12/06 takes precedence
• CPC Class Codes: A61L 2/04 Heat A61L2/08 takes precedence

Abstract

A sterilizer for use in sterilizing articles removably received therein, includes first thermal insulating means with a receiving cavity formed therein; cover means including a second thermal insulating means, the cover means being movable with respect to the first means for selectively covering said cavity; heating means received within the cavity and defining recess means for removably receiving therein an article to be sterilized, the heating means having a preselected volume for relatively slowly dissipating heat; and power control means for selectively applying electrical power to the heating means for heating the heating means, and for automatically cutting off the power to the heating means in response to a first predetermined temperature being reached by the heating means, the combination of the heating means and the first and second insulation means resulting in a relatively slow rate of heat loss from the heating means for enabling the temperature of the heating means not to fall below a second predetermined temperature, until a measured period of time elapsed after the electric power has automatically been cut off to the heating means.

Claims

1. A sterilizer for use in sterilizing articles removably received therein, including a first volume of thermal insulating means with a receiving cavity formed therein;

cover means including a second volume of thermal insulating means, said cover means being movable with respect to said first means for selectively covering said cavity;

heating means received within said cavity and defining recess means for removably receiving therein an article to be sterilized, said heating means having a preselected volume relative to said first and second volumes of thermal insulating means for relatively slowly dissipating heat; and

power control means for selectively applying electrical power to said heating means for heating said heating means and for automatically cutting off the power to said heating means in response to a first predetermined temperature being reached by said heating means, the combination of the volume of said heating means and the volume and thermal conductivity of said insulating means resulting in a relatively slow rate of heat loss enabling the temperature of said heating means not to fall below a second predetermined temperature, which is lower in value than the first predetermined value, until a measured period of time has elapsed after the electric power has automatically been cut off to said heating means, whereby said second predetermined temperature remains above sterilization temperature for a time sufficient to effect sterilization.

2. A sterilizer for use in sterilizing articles removably received therein, including base means having a first thermal insulating block member having a predetermined volume and with a receiving cavity formed within said first block member;

cover means including a second thermal insulating block member having a predetermined volume, said cover means being movable with respect to said base means for selectively covering said cavity;

heating means received within said cavity and defining recess means for removably receiving therein an article to be sterilized, said heating means having a preselected volume relative to the volumes of said first and second block members for relatively slowly dissipating heat; and

power control means for selectively applying electrical power to the said heating means for heating said heating means and for automatically cutting off the power to said heating means in response to a first predetermined temperature being reached by said heating means, said first and second insulating block members having relatively low thermal and electrical conductivity such that the combination of the ratio of the volume of said heating means to the volume of said insulating block members results in a relatively slow rate of heat loss enabling the temperature of said heating means not to fall below a second predetermined temperature, which is lower in value than the first predetermined temperature value, until a measured period of time has elapsed after the electric power has automatically been cut off to said heating means, whereby said second predetermined temperature remains above sterilization temperature for a time sufficient to effect sterilization.

3. A sterilizer as set forth in claim 2 in which said heating means includes a relatively large metallic block which serves as a heat reservoir.

4. A sterilizer as set forth in claim 3 in which said control means includes at least a thermal cutout device operatively connected to said metallic block for stopping flow of electrical power thereto in response to said first predetermined temperature value of the block being reached.

5. A sterilizer for use in sterilizing articles removably received therein, including base means having a first thermal insulating block member having a predetermined volume and with a receiving cavity formed within said first block member;

cover means including a second thermal insulating block member of predetermined volume and being movable with respect to said base means for selectively covering said cavity;

heating means received within said cavity and defining recess means for removably receiving therein an article to be sterilized, said heating means includes a relatively large block having a preselected volume relative to the volumes of said first and second block members and which serves as a heat reservoir for relatively slowly dissipating heat; and

power control means for selectively applying electrical power to the said heating means for heating said heating means, and including at least a thermal cutout device operatively connected to said metallic block for automatically stopping flow of electrical power thereto in response to a first predetermined temperature being reached by said metallic block, said first and second insulating block members having a relatively large volume and relatively low thermal and electrical conductivity such that the combination ratio of the volume of said heating means to the volume of said insulating block members results in a relatively slow rate of heat loss enabling the temperature of said heating means not to fall below a second predetermined temperature, which is lower in value than the first predetermined temperature, until a measured period of time has elapsed after the electric power has automatically been cut off to said heating means, whereby said second predetermined temperature remains above sterilization temperature for a time sufficient to effect sterilization.