Microwave remediation of medical wastes

• US 8,318,086 B2
• Filed: 06/12/2009
• Issued: 11/27/2012
• Est. Priority Date: 06/12/2009
• Status: Active Grant

• Current Assignee: Ashwin-Ushas Corporation, Inc.
• Original Assignee: Ashwin-Ushas Corporation, Inc.
• Inventors: Chandrasekhar, Prasanna
• Primary Examiner(s): Griffin, Walter D
• Assistant Examiner(s): CLEVELAND, TIMOTHY C
• Application Number:
  US12/483,398
• Publication Number:
  US 20100316526A1
• Time in Patent Office: 1,264 Days
• Field of Search: 422/21, 422/38, 422/291, 422/292, 422/300, 422/301, 422/307
• US Class Current: 422/21
• CPC Class Codes: A61L 11/00 Methods specially adapted for refuse disintegrating medical waste B02C19/0075; disposal of medical waste B09B3/00
• CPC Class Codes: A61L 2/12 Microwaves

Abstract

Methods, devices, and remediation compositions for the microwave remediation of medical wastes are provided. The remediation compositions include a microwave active fluid including a microwave active liquid, a microwave enhancer, and a viscosity modifying agent. Methods include immersing medical waste in the remediation composition and then irradiating the medical waste and the remediation composition to remediate the medical waste. The devices include a container for the medical waste and the remediation composition, a microwave radiation source and a temperature monitoring device.

Claims

1. A stable microwave-active fluid composition for medical waste remediation comprising:

(a) a microwave active liquid comprising poly(glycol), glycerol monostearate, glycerol lactate, glycerol acid esters, or combinations thereof, and having a boiling point from about 150°

C. to about 300°

C., wherein said microwave active liquid when irradiated with microwave radiation (i) heats up, thereby exposing medical waste to increased temperatures, (ii) exhibits denaturing properties that allow the irradiated microwave active liquid to break down proteins and chemical bonds in other biological molecules in the medical waste and (iii) exhibits a temperature rise at least 1.5 times that of water under irradiation;

(b) a microwave enhancer comprising activated carbon, SiC, Fe₃O₄, or combinations thereof, and said microwave enhancer being a solid having strong dipoles and contributing to the heating and activation of the microwave active fluid composition; and

(c) a sol-stabilizing agent comprising poly(ethylene oxide), said sol-stabilizing agent assisting in rendering said microwave enhancer (b) into a sol and in incorporating said sol into the microwave active liquid of (a).

2. The composition of claim 1, wherein the microwave active liquid is water soluble.

3. The composition of claim 1, wherein the microwave active liquid comprises poly(ethylene glycol), poly(propylene glycol), or combinations thereof.

4. The composition of claim 3, wherein the microwave active liquid is poly(ethylene glycol).

5. The composition of claim 4, wherein the poly(ethylene glycol) has an average molecular weight, M_n from about 200 to about 420.

6. The composition of claim 1, wherein the sol-stabilizing agent comprises about 0.01 wt. % to about 5 wt. % of the composition.

7. The composition of claim 1, wherein the sol-stabilizing agent comprises about 0.1 wt. % to about 1 wt. % of the composition.

8. The composition of claim 1, wherein the poly(ethylene oxide) has an average molecular weight, M_n of from about 100,000 to about 8,000,000.

9. The composition of claim 1, wherein the poly(ethylene oxide) has an average molecular weight, M_n of about 200,000.

10. The composition of claim 1, wherein the microwave enhancer comprises about 0.25 wt. % to about 5 wt. % of the composition.

11. The composition of claim 1, wherein the microwave active liquid comprises at least about 80 wt. % of the composition, the sol-stabilizing agent comprises about 0.01 wt. % to about 5 wt. % of the composition, and the microwave enhancer comprises about 0.25 wt. % to about 5 wt. % of the composition.

12. A system for medical waste remediation comprising:

(a) a container;

(b) a waste receptacle for holding medical waste, the waste receptacle being sized to fit in the container;

(c) a remediation composition for immersing the medical waste, wherein said remediation composition is the microwave active fluid composition of claim 1;

(d) a container lid;

(e) a temperature probe for measuring the temperature of the remediation composition in the waste receptacle; and

(f) a microwave oven for irradiating the medical waste and the remediation composition.

13. The system of claim 12, wherein the container, the waste receptacle, and the container lid are made from microwave-transparent materials.

14. The system of claim 13, wherein the container, the waste receptacle and the container lid are made from borosilicate glass, polytetrafluroethylene (“

PTFE”

), poly(imide) or poly(ether imide).

15. The system of claim 12, further comprising a controller for controlling the power level of the microwave oven, the controller in communication with the temperature probe and the microwave oven.

16. The system of claim 12, wherein the waste receptacle is made from metal having perforations about 1 cm in diameter.