Patent US4516571A successfully refreshed from Google Patents.
US4516571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical device, its preparation and use
Assignee: Smith and Nephew PLC
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Filing: 1984-03-08
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Granted: 1985-05-14
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Expires: 2004-03-08
Abstract
Abstract A device suitable for the prophylaxis of pressure sores which device comprises a gel retained within a flexible elastomeric envelope which envelope has a body contacting surface which is a film having a moisture vapor transmission rate of greater than 300 g/m 2 /24 hr -1 at 37° C. at 100% to 10% relative humidity difference characterized in that the device is 5 to 25 mm thick and may be worn on the body and the gel is a mobile moisture absorbing hydrophilic gel is described.
Inventors
- 👤 Ian A. Buchan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:46
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F; A61F13/00; A61F13/02; A61F13/023; A61G; A61G7/00; A61G7/05; A61G7/057; A61G7/05738; A61L15/22; A61L15/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
A device useful for the prophylaxis of pressure sores and which is removably attachable to the human body which device comprises a mobile moisture absorbing hydrophilic gel retained within a flexible elastomeric envelope which envelope has a body contacting surface which is a film having a moisture vapour transmission rate of greater than 300 g/m 2 24 hr -1 at 37° C. at 100% to 10% relative humidity difference said device being 5 to 25 mm thick.
Claim 2
Independent Claim
77 words
A device useful for the prophylaxis of pressure sores and which is removably attachable to the human body which device comprises a mobile moisture absorbing hydrophilic gel retained within a flexible elastomeric envelope which envelope has a body contacting surface which is a film having a moisture vapour transmission rate of greater than 300 g/m 2 24 hr -1 at 37° C. at 100% to 10% relative humidity difference said device being 5 to 25 mm thick.
Claim 3
Dependent Claim
52 words
A device according to claim 1 in which the body contacting surface film is coated with a pressure sensitive adhesive, the adhesive coated body contacting surface film having a moisture vapour transmission rate of greater than 500 g/m 2 24 hr -1 at 37° C. at 100% to 10% relative humidity difference.
Claim 4
Dependent Claim
31 words
A device according to claim 1 in which the film extends beyond the flexible elastomeric envelope to form a margin which is adhesive coated for attaching the device to the body.
Claim 5
Dependent Claim
46 words
A device according to claim 1 in which the mobile hydrophilic gel has a viscosity between 1500 and 6,000 Poise as measured at 39° C., using a 1 cm radius cone driven at 5 r.p.m., a 1200 g spring, using a Ferranti-Shirley Cone and Plate Viscometer.
Claim 6
Dependent Claim
25 words
A device according to claim 1 in which the mobile hydrophilic gel absorbs more than 10% water when in contact with water or moisture vapour.
Claim 7
Dependent Claim
33 words
A device according to claim 1 in which the device has a rate of water uptake greater than 150 mg/72 hrs/cm 2 of the skin contacting body surface of the gel filled envelope.
Claim 8
Dependent Claim
16 words
A device according to claim 1 in which the mobile hydrophilic gel is a hydrophilic polyurethane.
Claim 9
Dependent Claim
43 words
A device according to claim 7 in which the mobile hydrophilic gel is a linear hydrophilic polyurethane formed from a random polyoxyethylene polyoxypropylene diol copolymer and a di-isocyante such that the ratio of isocyanate groups to hydroxyl groups is between 0.5 and 0.7.
Claim 10
Dependent Claim
16 words
A device according to claim 1 in which the body contacting surface film is a polyurethane.
Claim 11
Dependent Claim
24 words
A device according to claim 1 in which the body contacting surface film is a polyetherester block copolymer or a polyether polyamide block copolymer.
Claim 12
Dependent Claim
26 words
A device according to claim 1 in which the device is sufficiently transparent to allow the appearance of the skin beneath the device to be viewed.
Claim 13
Dependent Claim
22 words
A device according to claim 1 in which the skin contact area of the envelope is less than 200 cm 2 .
Claim 14
Dependent Claim
24 words
A device according to claim 1 in which the volume of hydrophilic mobile gel in the envelope is less than 300 cm 3 .
Claim 15
Dependent Claim
12 words
A device according to claim 1 which comprises 1 to 10 envelopes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |