Apparatus and method for disinfecting a contaminated object

• US 5,250,160 A
• Filed: 02/28/1992
• Issued: 10/05/1993
• Est. Priority Date: 06/04/1990
• Status: Expired due to Fees

• Current Assignee: Henry C. Oksman, Joseph Eisner
• Original Assignee: Henry C. Oksman, Joseph Eisner
• Inventors: Oksman, Henry C., Eisner, Joseph
• Primary Examiner(s): Valentine, Donald R.
• Application Number:
  US07/843,745
• Time in Patent Office: 585 Days
• Field of Search: 204/130, 204/242, 204/131, 204/228
• US Class Current: 205/701
• CPC Class Codes: A61L 2/035 Electrolysis
• CPC Class Codes: A61L 2/24 Apparatus using programmed or automatic operation

Abstract

A system and method for applying a disinfectant solution which may include a salt and a buffer to an instrument, object or mass wherein the solution is selectively rendered disinfecting and neutral by impressing a voltage across it to ionize an unstable salt which yields toxic ions only while the voltage is applied. The system can be used to disinfect both metallic and plastic instruments.

Claims

1. An electrochemical disinfection system for sterilizing an object comprising

container means for receiving said object while it is being disinfected,

a solution contained within said container means for enveloping said object while it is received in said container means,

two electrodes disposed in contact with said solution,

a voltage source connected between said electrodes for applying a voltage thereacross, and

a voltage controller for applying said voltage across said electrodes to increase the toxicity of said solution during disinfection and for interrupting application of said voltage to said electrodes to decrease the toxicity of said solution,

said solution being conductive for conducting an electric current between said electrodes during application of said voltage,

said current generating ions in said solution for dispersion into contact with said object for disinfecting said object during application of said voltage to said electrodes, said ions recombining upon interruption of said voltage.

2. An electrochemical disinfection system for sterilizing an object according to claim 1 wherein said conductive electrolytic salt is selected from the group consisting of NaCl, Na₂ SO₄, Na₃ PO₄, CaSO₄, NaI, NaF and KBr.

3. An electrochemical disinfection system for sterilizing an object according to claim 2 further comprising a buffer.

4. An electrochemical disinfection system for sterilizing an object according to claim 3 wherein said buffer is a phosphate buffer.

5. An electrochemical disinfection system for sterilizing an object according to claim 4 wherein said buffer is selected from the group consisting of NaH₂ PO₄, Na₂ HPO₄ and Na₃ PO₄.

6. An electrochemical disinfection system for sterilizing an object according to claim 2 wherein said solution comprises Na₃ PO₄, NaCl and NaI.

7. An electrochemical disinfection system for sterilizing an object according to claim 6 containing 9.2565 grams per liter of Na₃ PO₄, 0.88951 grams per liter of NaCl, and 2.295 grams per liter of NaI, each plus or minus 15%.

8. An electrochemical disinfection system for sterilizing an object according to claim 2 wherein said solution comprises Na₂ SO₄, NaCl and NaI.

9. An electrochemical disinfection system for sterilizing an object according to claim 8 containing 14.484 grams per liter of Na₂ SO₄, 1.7902 grams per liter of NaCl, and 4.590 grams per liter of NaI, each plus or minus 15%.

10. A method of disinfecting an object comprising electrolyzing a solution of a stable salt and an unstable salt by a applying a voltage across it to cause the unstable salt to release toxic ions, dispersing said toxic ions in said solution about the object until it is disinfected, and, thereafter, interrupting said voltage to render said solution non-toxic.

11. A method of disinfecting an object according to claim 10 further comprising adding a base to said solution to raise its pH to between 5 and 8 for disinfecting metallic and/or plastic instruments without oxidation.

12. A method of disinfecting fruits and/or vegetables comprising immersing the fruits or vegetables in a solution comprising a stable salt and an unstable salt, and applying a voltage across that solution to render the solution disinfecting for decontaminating or preserving the shelf life of said fruits and/or vegetables.