US5014494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sterilizing medical articles
Assignee: Covidien AG
•
Filing: 1988-09-27
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Granted: 1991-05-14
•
Expires: 2008-09-27
Abstract
Abstract In a method of radiation sterilization of medical articles, replacing the oxygen in the sterilization package with nitrogen prior to sterilizing prevents most of the brittleness and discoloration in the articles.
Inventors
- 👤 Robert D. George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:05
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; B; B65; B65B; B65B55/00; B65B55/02; B65B55/12; B65B55/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
A method of sterilizing medical articles which comprises: (a) placing the articles in gas permeable packages, (b) sealing the packages, (c) placing the packages in sealable containers, (d) sealing the containers, (e) pumping a non-reactive gas into the sealed containers, (f) permitting the packages to remain in the containers until the oxygen in the packages has been purged therefrom by the non-reactive gas, and (g) irradiating the packages and the articles to sterilize the latter while the packages are essentially purged of oxygen.
Claim 2
Independent Claim
83 words
A method of sterilizing medical articles which comprises: (a) placing the articles in gas permeable packages, (b) sealing the packages, (c) placing the packages in sealable containers, (d) sealing the containers, (e) pumping a non-reactive gas into the sealed containers, (f) permitting the packages to remain in the containers until the oxygen in the packages has been purged therefrom by the non-reactive gas, and (g) irradiating the packages and the articles to sterilize the latter while the packages are essentially purged of oxygen.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the atmosphere of non-reactive gas is nitrogen.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the articles are plastic syringes.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the packages are irradiated in said containers.
Claim 6
Dependent Claim
42 words
The method of claim 1 wherein the packages are permitted to remain in said containers as described in step (f) for a period of time from under a minute to several hours to allow oxygen in the packages to be purged thereform.
Claim 7
Independent Claim
99 words
A method of sterilizing a medical article which comprises: (a) placing at least one article in a gas permeable package, (b) sealing the package, (c) placing at least one package in a sealable container, (d) sealing the container, (e) pumping a non-reactive gas into the sealed container, (f) permitting the at least one package to remain in the container until the oxygen in the package has been purged therefrom by the non-reactive gas, and (g) irradiating the at least one package and the at least one article to sterilize the latter while said package is essentially purged of oxygen.
Claim 8
Independent Claim
99 words
A method of sterilizing a medical article which comprises: (a) placing at least one article in a gas permeable package, (b) sealing the package, (c) placing at least one package in a sealable container, (d) sealing the container, (e) pumping a non-reactive gas into the sealed container, (f) permitting the at least one package to remain in the container until the oxygen in the package has been purged therefrom by the non-reactive gas, and (g) irradiating the at least one package and the at least one article to sterilize the latter while said package is essentially purged of oxygen.
Claim 9
Dependent Claim
13 words
The method of claim 6 wherein the atmosphere of non-reactive gas is nitrogen.
Claim 10
Dependent Claim
15 words
The method of claim 6 wherein the at least one article is a plastic syringe.
Claim 11
Dependent Claim
16 words
The method of claim 6 wherein the at least one package is irradiated in the container.
Claim 12
Dependent Claim
42 words
The method of claim 6 wherein the package is permitted to remain in the container as described in step (f) for a period of time from under a minute to several hours to allow oxygen in the package to be purged therefrom.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |