Patent US5234832A successfully refreshed from Google Patents.
US5234832A
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Process for cleaning and disinfecting heat and corrosion sensitive medical instruments
Assignee: Henkel AG and Co KGaA
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Filing: 1989-05-17
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Granted: 1993-08-10
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Expires: 2009-05-17
Abstract
Abstract The invention is a process for cleaning and disinfection of heat and corrosion sensitive medical instruments, particularly endoscopes in which the surfaces of the medical instruments are contacted with a detergent and disinfectant solution. The solution has a pH of from 6 to 8 and contains a low foaming nonionic surfactant, a proteolytic enzyme, a complexing agent, and an aldehyde selected from the group consisting of formaldehyde and aliphatic dialdehydes containing 2 to 8 carbon atoms and, optionally, other standard detergent and disinfectant constituents. The cleaning solution is heated to 55° to 65° C. and kept at that temperature for 1 to 15 minutes during contact with the surfaces of a medical instrument. The surfaces are rinsed at least twice with water, the water being heated to 55° to 65° C. at least in the last rinse cycle and the medical instruments are dried with sterilized hot air at a temperature of 40° to 60° C. Water having a hardness of 3° to 8° Gh is used.
Inventors
- 👤 Karlheinz Disch
- 👤 Klaus Hachmann
- 👤 Klaus Bansemir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:33
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/16; A61L2/18; C; C11; C11D; C11D1/00; C11D1/66; C11D1/72; C11D1/721; C11D3/00; C11D3/16; C11D3/38; C11D3/386; C11D3/38618; C11D3/48; C11D2111/00; C11D2111/40; C11D2111/44; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
174 words
A process for the cleaning and disinfecting surfaces of heat and corrosion sensitive medical instruments with an aqueous cleaning and disinfectant solution which comprises in successive steps: a) contacting the surfaces to be cleaned and disinfected with the aqueous detergent and disinfectant solution which contains; water having a hardness of 3° to 8° Gh (German hardness); at least one low foaming nonionic surfactant; at least one proteolytic enzyme; at least one complexing agent; at least one aldehyde disinfectant selected from the group consisting of formaldehyde and aliphatic dialdehydes containing 2 to 8 carbon atoms; at a pH of about 6 to about 8, at a temperature of about 55° to 65° C., for about 1 to about 15 minutes; b) rinsing the surfaces at least twice with water having a hardness of 3° to 8° Gh (German hardness), at a temperature of about to 55° to about 65° C. at least in the last rinse cycle; and c) drying the surfaces with sterilized air at a temperature of about 40° to about 60° C.
Claim 2
Dependent Claim
174 words
A process for the cleaning and disinfecting surfaces of heat and corrosion sensitive medical instruments with an aqueous cleaning and disinfectant solution which comprises in successive steps: a) contacting the surfaces to be cleaned and disinfected with the aqueous detergent and disinfectant solution which contains; water having a hardness of 3° to 8° Gh (German hardness); at least one low foaming nonionic surfactant; at least one proteolytic enzyme; at least one complexing agent; at least one aldehyde disinfectant selected from the group consisting of formaldehyde and aliphatic dialdehydes containing 2 to 8 carbon atoms; at a pH of about 6 to about 8, at a temperature of about 55° to 65° C., for about 1 to about 15 minutes; b) rinsing the surfaces at least twice with water having a hardness of 3° to 8° Gh (German hardness), at a temperature of about to 55° to about 65° C. at least in the last rinse cycle; and c) drying the surfaces with sterilized air at a temperature of about 40° to about 60° C.
Claim 3
Dependent Claim
44 words
The process of claim 1, wherein the detergent and disinfectant solution of step a) contains from 0.1 to 1.0 g/liter low foaming surfactant, from 0.03 to 0.3 AU/liter proteolytic enzyme, from 0.02 to 0.3 g/liter complexing agent and from 0.5 to 5 g/liter aldehyde
Claim 4
Dependent Claim
108 words
The process of claim 1 wherein the detergent and disinfectant solution of step a) contains at least one low foaming nonionic surfactant comprising an alkylene oxide adduct from 3 to 30 mol of at least one member selected from the group consisting of ethylene oxide and propylene oxide to a member selected from the group consisting of aliphatic polyols containing from 2 to 6 hydroxyl groups and from 2 to 12 carbon atoms, fatty alcohols, fatty acids, fatty amines or alkylphenols each containing from 8 to 18 carbon atoms, wherein the terminal groups of the polyglycol ether derivatives can be hydroxyl, etherified hydroxyl, esterified hydroxyl, or acetylated hydroxyl.
Claim 5
Dependent Claim
102 words
The process of claim 1 wherein the detergent and disinfectant solution of step a) contains a low foaming nonionic surfactant from the group consisting of adducts of 3 to 15 mol ethylene oxide with saturated and unsaturated C 8 -C 18 fatty alcohols, adducts of from 3 to 5 mol ethylene oxide and from 3 to 6 mol propylene oxide with saturated and unsaturated C 8 -C 18 fatty alcohols and ether derivatives of the fatty alcohol polyalkylene glycol ethers, in which the terminal hydroxyl groups are etherified with a straight chain or branched chain, saturated aliphatic C 4 -C 8 alcohol.
Claim 6
Dependent Claim
102 words
The process of claim 4 wherein the detergent and disinfectant solution of step a) contains as the low foaming surfactant a polyethylene glycol ether of the formula: R.sup.1 --O--(CH.sub.2 CH.sub.2 O).sub.n --R.sup.2 (I) in which R 1 is a straight chain C 8 -C 18 alkyl, a branched chain C 8 -C 18 a alkyl, a straight chain C 8 -C 18 alkenyl, a branched chain C 8 -C 18 a alkenyl, R 2 is a straight chain C 4 -C 8 alkyl, a branched chain C 4 -C 8 alkyl radical and n is a number of from 7 to 12.
Claim 7
Dependent Claim
57 words
The process of claim 5, wherein the detergent and disinfectant solution of step a) contains a polyethylene glycol ether of formula I in which R 1 is a mixture of C 12 -C 18 radicals of a tallow fatty alcohol and R 2 is an n-butyl radical and n is a number of from 9 to 10.
Claim 8
Dependent Claim
86 words
The process of claim 1 wherein the detergent and the disinfectant solution of step a) contains at least one complexing agent selected from the group consisting of alkali metal salts of nitrilotriacetic acid, alkali metal salts of ethylenediamine tetracetic acid, alkali metal salts of 1-hydroxyethane-1,1-diphosphonic acid, alkali metal salts of aminotris-(methylene- phosphonic acid), alkali metal salts of ethylenediamine tetrakis-(methylenephosphonic acid), alkali metal salts of phosphonobutane tricarboxylic acid, alkali metal salts of tartaric acid, alkali metal salts of citric acid and alkali metal salts of gluconic acid.
Claim 9
Dependent Claim
25 words
The process of claim 7 wherein the detergent and disinfectant solution of step a) contains alkali metal salts of phosphonobutane tricarboxylic acid as complexing agent.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein the detergent and the disinfectant solution of step a) contains glutaraldehyde.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein the medical instrument is an endoscope.
Claim 12
Dependent Claim
13 words
The process of claim 10 wherein the endoscope is ultrasonicated in step a).
Claim 13
Dependent Claim
25 words
The process of claim 10 wherein the endoscope is treated in step c) with hot air which has been sterilized by passage through a microfilter.
References Cited (Backward Citations)
CH434574A
Cited
US3697222A
Cited
US4867797A
Cited
EP0118933A1
Cited
US4801451A
Cited
US4511490A
Cited
DE3327466A1
Cited
US4456544A
Cited
US4876024A
Cited
EP0268227A2
Cited
US4784790A
Cited
US4994200A
Cited
US4996146A
Cited
EP0342499A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |