Patent US5120544A successfully refreshed from Google Patents.
US5120544A
Expired / Lapsed
US
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Crosslinked hydrogel and method for making same
Assignee: DJO LLC
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Filing: 1990-06-15
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Granted: 1992-06-09
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Expires: 2010-06-15
Abstract
Abstract A chemically crosslinked hydrogel includes an active ingredient for transdermal transport selected from the group of lidocainehydrochloride, hydrocortisone, menthol, and methyl salicylate and utilizes as a crosslinking agent an aluminum acetate, which is a polyvalent salt, which renders the resulting hydrogel electrically conductive with a resistance of less than 10,000 ohms per linear centimeter.
Inventors
- 👤 Ernest J. Henley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:50
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/0404; A61N1/0408; A61N1/0428; A61N1/0448; A61K; A61K47/00; A61K47/30; A61K47/36; A61K47/38; A61K9/00; A61K9/0002; A61K9/0009; A61K9/0012; A61K9/0014; A61F; A61F13/00; A61F2013/00361; A61F2013/00902; A61F2013/00919; A61F13/15; A61F13/53; A61F2013/530481; A61F13/84; A61F2013/8476; A61F2013/8479
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
A method for providing a crosslinked, conductive hydrogel comprising the steps of: (a) combining water, carboxymethyl cellulose powder, emulsifies selected from the class of polyethylene glycol, gelatin or lanolin and a biologically active ingredient selected from the class of methol, lidocaine hydrochloride, hydrocortisone or methylsalicylate; (b) heating the combination to about 160 degrees Fahrenheit for about one hour; (c) cooling the combination to below 120 degrees Fahrenheit; (d) adding aluminum acetate to the combination to yield a crosslinked hydrogel; (e) forming the hydrogel into a desired shape; and (f) curing the hydrogel.
Claim 2
Independent Claim
92 words
A method for providing a crosslinked, conductive hydrogel comprising the steps of: (a) combining water, carboxymethyl cellulose powder, emulsifies selected from the class of polyethylene glycol, gelatin or lanolin and a biologically active ingredient selected from the class of methol, lidocaine hydrochloride, hydrocortisone or methylsalicylate; (b) heating the combination to about 160 degrees Fahrenheit for about one hour; (c) cooling the combination to below 120 degrees Fahrenheit; (d) adding aluminum acetate to the combination to yield a crosslinked hydrogel; (e) forming the hydrogel into a desired shape; and (f) curing the hydrogel.
Claim 3
Dependent Claim
27 words
A method as defined in claim 1 wherein the amount of said aluminum acetate added is from about 0.17% to about 0.5% by weight of the combination.
Claim 4
Dependent Claim
22 words
A method as defined in claim 1 wherein said forming step comprises spraying said hydrogel onto a conductive carbon or silicon electrode.
Claim 5
Dependent Claim
19 words
A method as defined in claim 1 wherein said forming step comprises painting said hydrogel onto a conductive electrode.
Claim 6
Dependent Claim
18 words
A method as defined in claim 1 wherein said forming step comprises depositing said hydrogel on a scrim.
Claim 7
Dependent Claim
19 words
A method as defined in claim 1 further comprising encasing said hydrogel and scrim between layers of release paper.
Claim 8
Dependent Claim
19 words
A method as defined in claim 1 wherein said forming step comprises depositing said hydrogel on a cellulose scrim.
Claim 9
Dependent Claim
22 words
A method as defined in claim 1 wherein said forming step comprises feeding the release paper, scrim, and uncured gel through rollers.
References Cited (Backward Citations)
US4706680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |