Systems and processes for treating textiles with an antimicrobial agent

• US 10,351,807 B2
• Filed: 01/13/2018
• Issued: 07/16/2019
• Est. Priority Date: 08/21/2015
• Status: Active Grant

• Current Assignee: Applied Silver, Inc.
• Original Assignee: Applied Silver, Inc.
• Inventors: Brezoczky, Thomas, Morham, Sean, Morris, William, Brown, David, Copenhagen, Keith
• Primary Examiner(s): Khan, Amina S
• Application Number:
  US15/870,944
• Publication Number:
  US 20180155222A1
• Time in Patent Office: 549 Days
• CPC Class Codes: A61L 2/18 Liquid substances or solutions comprising solids or dissolved gases
• CPC Class Codes: C02F 2103/02 Non-contaminated water, e.g. for industrial water supply
• CPC Class Codes: C11D 2111/12 Soft surfaces, e.g. textile
• CPC Class Codes: C11D 2111/44 Multi-step processes
• CPC Class Codes: C11D 3/48 Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
• CPC Class Codes: C11D 7/10 Salts
• CPC Class Codes: D06F 31/005 consisting of one or more rotating drums through which the laundry passes in a continuous flow
• CPC Class Codes: D06F 35/006 for washing or rinsing only
• CPC Class Codes: D06M 16/00 Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
• CPC Class Codes: D10B 2509/00 Medical; Hygiene

Abstract

According to an aspect of the present disclosure, a method of treating a textile with an antimicrobial agent over a plurality of laundry cycles each including a wash cycle and a treatment cycle. The method includes (a) receiving a textile in a wash system for a first laundry cycle, (b) initiating a wash cycle comprising a detergent, (c) initiating a post-detergent treatment cycle comprising dosing the textile with a solution having a predetermined concentration of an antimicrobial agent that comprises a metallic ion, and (c) repeating steps (a)-(c) for each of a plurality of additional laundry cycles. The predetermined concentration is insufficient to achieve a predetermined antimicrobial efficacy for the textile due to the first laundry cycle alone but sufficient to achieve the predetermined antimicrobial efficacy for the textile due to a combination of the first laundry cycle and one or more of the plurality of additional laundry cycles.

Claims

1. A method of reducing a microbial load in an inventory of textiles comprising a plurality of pieces from a healthcare facility, the method comprising:

(a) receiving a first portion comprising a portion of the plurality of pieces of the inventory;

(b) initiating a laundry cycle comprising a wash cycle and a treatment cycle, wherein the treatment cycle comprises a solution having a predetermined concentration of an antimicrobial agent that comprises a metallic ion;

(c) receiving a subsequent portion of the inventory and repeating steps (b) in a subsequent laundry cycle for the subsequent portion, and

(d) repeating step (c) until a predetermined amount of the pieces of the inventory have achieved the predetermined antimicrobial efficacy,

thereby reducing the antimicrobial load of the inventory, wherein, prior to or after any one or more of steps (a)-(d), detecting the presence of silver in a textile, the method comprising;

(e) dispensing the first solution and the second solution onto separate areas of the textile, wherein the first solution comprises Cadion 2B which has a CAS No. 6708-61-8, a buffer sufficient to maintain a pH in the range of from about 8 to about 10, and a surfactant, and the second solution comprises Cadion 2B, a buffer sufficient to maintain a pH in the range of from about 8 to about 10, a surfactant, and a complexing agent, wherein formation of a complex of the complexing agent and silver is more favorable than formation a complex of Cadion B and silver; and

(f) comparing the color of the dispensed first solution and the dispensed second solution.

2. The method of claim 1, wherein a single laundry cycle is insufficient to achieve the predetermined antimicrobial efficacy.

3. The method of claim 1, wherein the subsequent portion includes a plurality of pieces from the first portion.

4. The method of claim 1, wherein the predetermined amount of the pieces comprises at least 50% of the inventory.

5. The method of claim 1, wherein the predetermined antimicrobial efficacy is achieved when the textile is infused with at least approximately 1 mg of metallic ion per kg of textile.

6. The method of claim 1, wherein the solution comprises water treated by deionization or reverse osmosis.

7. The method according to claim 1, wherein at least one of the first solution and the second solution further comprise a masking agent.

8. The method according to claim 7, wherein the masking agent is ethylenediaminetetraacetic acid (EDTA) or cyclohexanediaminetetraacetic acid (CDTA).

9. The method according to claim 1, wherein at least one of the first solution and the second solution further comprise a water-miscible organic solvent.

10. The method according to claim 9, wherein the water-miscible organic solvent is 1-methyl-2-pyrrolidinone.

11. The method according to claim 1, wherein the complexing agent is sodium thiosulfate.

12. The method according to claim 1, wherein the buffer comprises one or more of potassium tetraborate, citric acid, and sodium citrate.

13. A method of reducing a microbial load in an inventory of textiles comprising a plurality of pieces from a healthcare facility, the method comprising:

laundering at least a portion of the plurality of pieces in a wash cycle comprising treatment cycle comprising a solution having a predetermined concentration of an antimicrobial agent that comprises a metallic ion;

wherein, prior to or after the wash cycle, detecting the presence of silver in a textile by

(a) dispensing the first solution and the second solution onto separate areas of the textile, wherein the first solution comprises Cadion 2B which has a CAS No. 6708-61-8, a buffer sufficient to maintain a pH in the range of from about 8 to about 10, and a surfactant, and the second solution comprises Cadion 2B, a buffer sufficient to maintain a pH in the range of from about 8 to about 10, a surfactant, and a complexing agent, wherein formation of a complex of the complexing agent and silver is more favorable than formation a complex of Cadion B and silver; and

(b) comparing the color of the dispensed first solution and the dispensed second solution.

14. The method according to claim 13, wherein at least one of the first solution and the second solution further comprise a masking agent.

15. The method according to claim 14, wherein the masking agent is ethylenediaminetetraacetic acid (EDTA) or cyclohexanediaminetetraacetic acid (CDTA).

16. The method according to claim 13, wherein at least one of the first solution and the second solution further comprise a water-miscible organic solvent.

17. The method according to claim 16, wherein the water-miscible organic solvent is 1-methyl-2-pyrrolidinone.

18. The method according to claim 13, wherein the complexing agent is sodium thiosulfate.

19. The method according to claim 13, wherein the buffer comprises one or more of potassium tetraborate, citric acid, and sodium citrate.