Patent US5204110A successfully refreshed from Google Patents.
US5204110A
Expired / Lapsed
US
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High absorbency hydrogel wound dressing
Assignee: Conmed Corp
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Filing: 1992-02-19
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Granted: 1993-04-20
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Expires: 2012-02-19
Abstract
Abstract A flexible burn dressing product contains a high absorbency hydrogel material in a gel phase. The hydrogel material is formed from a hydrogel composition for use in a wound dressings. The hydrogel composition is formed from a mixture comprising: (a) from about 0% to about 90% by weight polyhydric alcohol selected from the group consisting of polypropylene glycol, polyethylene glycol and glycerine; (b) from about 6% to about 60% by weight aliphatic diisocyanate terminated prepolymer based on polyols containing more than about 40% polyethylene oxide and having an isocyanate content of about 3% by weight; (c) from about 4% to about 40% by weight polyethylene oxide based polyamine; (d) up to about 2% by weight sodium chloride; and (e) the balance water. Such a hydrogel material provides a highly absorbent material capable of retaining large amounts of wound exudate, thereby rendering it very suitable for use in wound dressings.
Inventors
- 👤 James V. Cartmell
- 👤 Wayne R. Sturtevant
- 👤 Michael L. Wolf
- 👤 Michael J. Allaire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F; A61F13/00; A61F13/02; A61F13/023; A61L15/22; A61L15/26; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00523; A61F2013/00544; A61F2013/00553; A61F2013/00604; A61F2013/00608; A61F2013/00727; A61F2013/00748; A61F2013/00795; A61F2013/008; A61F2013/00804; A61F2013/00829; A61F2013/00846; A61F2013/00855; A61F2013/00868
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
64 words
A hydrogel composition for use in a wound dressing formed form a mixture comprising: (a) from about 0% to about 90% by weight polyhydric alcohol; (b) from about 6% to about 60% by weight isophoronediisocyanate terminated prepolymer; (c) from about 4% to about 40% by weight polyethylene oxide based polyamine; (d) 0% to about 2% by weight sodium chloride; and (e) the balance water.
Claim 2
Dependent Claim
64 words
A hydrogel composition for use in a wound dressing formed form a mixture comprising: (a) from about 0% to about 90% by weight polyhydric alcohol; (b) from about 6% to about 60% by weight isophoronediisocyanate terminated prepolymer; (c) from about 4% to about 40% by weight polyethylene oxide based polyamine; (d) 0% to about 2% by weight sodium chloride; and (e) the balance water.
Claim 3
Dependent Claim
60 words
The hydrogel composition of claim 1 wherein said mixture comprises: (a) from about 15% to about 30% by weight polyhydric alcohol; (b) from about 8% to about 14% by weight isophoronediisocyanate terminated prepolymer; (c) from about 5% to about 10% by weight polyethylene oxide based diamine; (d) up to about 1% by weight sodium chloride; and (e) the balance water.
Claim 4
Dependent Claim
57 words
The hydrogel composition of claim 1 wherein said mixture comprises: (a) from about 16% to 17% by weight polypropylene glycol; (b) from about 10% to 12% by weight isophoronediisocyanate terminated prepolymer; (c) from about 7% to 9% by weight polyethylene oxide based diamine; (d) about 0.5% to 1% by weight sodium chloride; and (e) the balance water.
Claim 5
Dependent Claim
35 words
The hydrogel composition of claim 1 wherein said aliphatic diisocyanate terminated prepolymer is an isophoronediisocyanate based on polyols containing more than about 40% polyethylene oxide and having an isocyanate content of about 3% by weight.
Claim 6
Dependent Claim
25 words
The hydrogel composition of claim 4 wherein the molecular weight of said isophoronediisocyanate terminated prepolymer is in a range from about 1500 to about 8000.
Claim 7
Dependent Claim
31 words
The hydrogel composition of claim 1 wherein said polyethylene oxide based polyamine is a polyethylene oxide based diamine having a molecular weight in a range from about 200 to about 6000.
Claim 8
Dependent Claim
25 words
The hydrogel composition of claim 1 wherein said aliphatic diisocyanate terminated prepolymer and said polyethylene oxide based polyamine have a stoichiometric ratio of about 1:1.
Claim 9
Dependent Claim
27 words
The hydrogel composition of claim 1 wherein said mixture is transparent so as to permit visual inspection of a wound to which said hydrogel composition is adhered.
Claim 10
Dependent Claim
13 words
The hydrogel composition of claim 1 wherein said polyhydric alcohol is polypropylene glycol.
Claim 11
Dependent Claim
96 words
A hydrogel composition for use in a wound dressing formed from a mixture comprising: (a) from about 0% to about 90% by weight polyhydric alcohol selected form the group consisting of polypropylene glycol, polyethylene glycol and glycerine; (b) from about 6% to about 60% by weight isophoronediisocyanate terminated prepolymer based on polyols containing more than about 40% polyethylene oxide and having an isocyanate content of about 3% by weight; (c) from about 4% to about 40% by weight polyethylene oxide based diamine; (d) up to about 2% by weight sodium chloride; and (e) the balance water.
Claim 12
Dependent Claim
96 words
A hydrogel composition for use in a wound dressing formed from a mixture comprising: (a) from about 0% to about 90% by weight polyhydric alcohol selected form the group consisting of polypropylene glycol, polyethylene glycol and glycerine; (b) from about 6% to about 60% by weight isophoronediisocyanate terminated prepolymer based on polyols containing more than about 40% polyethylene oxide and having an isocyanate content of about 3% by weight; (c) from about 4% to about 40% by weight polyethylene oxide based diamine; (d) up to about 2% by weight sodium chloride; and (e) the balance water.
Claim 13
Dependent Claim
18 words
The hydrogel composition of claim 10 wherein said isophoronediisocyanate terminated prepolymer has a molecular weight of about 4000-5000.
Claim 14
Dependent Claim
22 words
The hydrogel composition of claim 10 wherein said polyethylene oxide based diamine has a molecular weight in a range from about 2000.
Claim 15
Dependent Claim
48 words
The hydrogel composition of claim 10 wherein said mixture comprises: (a) about 52.7% by weight polypropylene glycol; (b) about 14.8% by weight isophoronediisocyanate terminated prepolymer; (c) about 9.5% by weight polyethylene oxide based diamine; (d) about 0.2% by weight sodium chloride; and (e) about 22.8% by weight water.
Claim 16
Dependent Claim
24 words
The hydrogel composition of claim 10 wherein said isophoronediisocyanate terminated prepolymer and said polyethylene oxide based diamine have a stoichiometric ratio of about 1:1.
Claim 17
Dependent Claim
27 words
The hydrogel composition of claim 10 wherein said mixture is transparent so as to permit visual inspection of a wound to which said hydrogel composition is adhered.
Claim 18
Dependent Claim
13 words
The hydrogel composition of claim 10 wherein said polyhydric alcohol is polypropylene glycol.
Claim 19
Dependent Claim
107 words
A hydrogel composition formed from a mixture comprising: (a) from about 15% to about 30% by weight polyhydric alcohol selected from the group consisting of polypropylene glycol, polyethylene glycol and glycerine; (b) from about 8% to about 14% by weight isophoronediisocyanate terminated prepolymer based on polyols containing more than about 40% polyethylene oxide and having an isocyanate content of about 3% by weight; (c) from about 5% to about 10% by weight polyethylene oxide based diamine, said isophoronediisocyanate terminated prepolymer and said polyethylene oxide based diamine having a stoichiometric ratio of about 1:1; (d) up to about 1% by weight sodium chloride; and (e) the balance water.
Claim 20
Dependent Claim
107 words
A hydrogel composition formed from a mixture comprising: (a) from about 15% to about 30% by weight polyhydric alcohol selected from the group consisting of polypropylene glycol, polyethylene glycol and glycerine; (b) from about 8% to about 14% by weight isophoronediisocyanate terminated prepolymer based on polyols containing more than about 40% polyethylene oxide and having an isocyanate content of about 3% by weight; (c) from about 5% to about 10% by weight polyethylene oxide based diamine, said isophoronediisocyanate terminated prepolymer and said polyethylene oxide based diamine having a stoichiometric ratio of about 1:1; (d) up to about 1% by weight sodium chloride; and (e) the balance water.
Claim 21
Dependent Claim
25 words
The hydrogel composition of claim 17 wherein the molecular weight of said isophoronediisocyanate terminated prepolymer is in a range from about 1500 to about 8000.
Claim 22
Dependent Claim
26 words
The hydrogel composition of claim 17 wherein the molecular weight of said polyethylene oxide based diamine is in a range from about 200 to about 6000.
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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) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |