Apparatus and method for sterilizing or disinfecting objects

• US 5,008,079 A
• Filed: 01/19/1989
• Issued: 04/16/1991
• Est. Priority Date: 01/19/1988
• Status: Expired due to Term

• Current Assignee: OY Santasalo-Sohlberg AB
• Original Assignee: OY Santasalo-Sohlberg AB
• Inventors: Wutzler, Peter, Mucke, Horst, Santasalo, Lauri
• Primary Examiner(s): Warden, Robert J.
• Assistant Examiner(s): Johnston, Jill
• Application Number:
  US07/299,968
• Time in Patent Office: 817 Days
• Field of Search: 422/28, 422/295
• US Class Current: 422/28
• CPC Class Codes: A61L 2/20 Gaseous substances, e.g. vapours

Abstract

Method and apparatus for sterilizing or disinfecting objects, especially thermosensitive objects, in a closed chamber such as an autoclave. The use of such sterilizing or disinfecting takes place particularly in health institutions such as hospitals, outpatient departments, etc., as well as in the pharmaceutical industry. The sterilization or disinfection is carried in a strong oxidizing agent, which can be an organic peracid, advantageously peracetic acid in gaseous form. Sterilization or disinfection is carried out in a closed chamber, under a vacuum or at atmospheric pressure. Utilizing a vacuum increases concentration of the active agent in the chamber, so that the requisite sterilizing time is shortened. According to the procedure, the sterilization or disinfection is carried out at, e.g. 40° to 50° C. which also increases the concentration of the active agent, so that a short action time is achieved involving minimal thermal stress on the objects which are being sterilized or disinfected. The peracetic acid used in the method is completely environmentally protective and safe because it disintegrates rapidly into oxygen and harmless acetic acids.

Claims

1. Method for sterilizing or disinfecting instruments in a closed chamber, comprising

carrying out said disinfecting or sterilizing with an organic peracid in a concentration of more than about 7 up to about 50% in aqueous solution, said organic peracid being a powerful oxidizing agent and wherein said disinfecting or sterilizing is additionally carried out with a quantity of agent of about 1 to 100 mg per liter of chamber volume.

2. Method for sterilizing or disinfecting instruments in a closed chamber, comprising

carrying out said disinfecting or sterilizing with an organic peracid in a concentration of more than about 7 up to about 50% in aqueous solution, said organic peracid being a powerful oxidizing agent and wherein the concentration of said peracid in aqueous solution is about 20 to 50%.

3. The method of claim 2, wherein the concentration of said peracid in aqueous solution is about 40%.

4. Method of sterilizing or disinfecting instruments in a closed chamber, comprising

carrying out said disinfecting or sterilizing with an organic peracid in a concentration of more than about 7 up to about 50% in aqueous solution, said organic peracid being a powerful oxidizing agent and wherein said disinfecting or sterilizing is additionally carried out at a temperature of about 20°

to 60°

C.

5. The method of claim 4, wherein said disinfecting or sterilizing temperature is about 20°

to 55°

C.

6. The method of claim 5, wherein said temperature is about 45°

C.

7. Method for sterilizing or disinfecting instruments in a closed chamber, comprising

carrying out said disinfecting or sterilizing with an organic peracid in a concentration of more than about 7 up to about 50% in aqueous solution, said organic peracid being a powerful oxidizing agent additionally comprising

carrying out said disinfecting or sterilizing in a vacuum, and

drawing off part of said agent after said agent has been introduced into said chamber, and

adding said withdrawn agent back into said chamber in order to provide a higher concentration of active substance in said chamber.

8. Method for sterilizing or disinfecting instruments in a closed chamber, comprising

carrying out said disinfecting or sterilizing with an organic peracid in a concentration of more than about 7 up to about 50% in aqueous solution, said organic peracid being a powerful oxidizing agent and wherein said disinfecting or sterilizing is carried out in a non-vacuum.

9. The method of claim 8, additionally comprising

vaporizing about 10 to 300 ml of agent per 100 liter of chamber volume.

10. The method of claim 9, additionally comprising

vaporizing about 30 to 100 ml of agent per liter of chamber volume.

11. Method for sterilizing or disinfecting instruments in a closed chamber, comprising

carrying out said disinfecting or sterilizing with an organic peracid in a concentration of more than about 7 up to about 50% in aqueous solution, said organic peracid being a powerful oxidizing agent, and additionally comprising

heating said agent to a suitable temperature by vaporizing.

12. The method of claim 11, wherein said vaporizing is carried out in apparatus separate from said closed chamber.

13. The method of claim 11, wherein said vaporizing is carried in said chamber itself.