US4688562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical device, its preparation and use
Assignee: Smith and Nephew PLC
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Filing: 1985-09-05
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Granted: 1987-08-25
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Expires: 2005-09-05
Abstract
Abstract A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible elastomeric envelope is described. The body contacting surface of the device is a film which has a moisture vapor transmission rate of greater than 300 g/m 2 /24 hr at 37° C. at 100% to 10% relative humidity difference. The liquid is a viscous liquid which absorbs moisture vapor. The device is formed in the shape of the letter "U" which makes the device particularly useful for application to the sacrum. A device in which the liquid retained within the flexible envelope is a mixture of a viscous liquid and a hygroscopic material is also described.
Inventors
- 👤 Ian A. Buchan
- 👤 Richard D. Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:55
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61F; A61F13/00; A61F13/01; A61F13/01034; A61F13/01046; A61F13/02; A61F13/0203; A61F2013/00089; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00387; A61F2013/00404; A61F2013/00544; A61F2013/00727; A61F2013/00761; A61F2013/00855; A61F2013/00876; A61F13/15; A61F2013/15008; A61F2013/15024
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
106 words
A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible elastomeric envelope having a body contacting surface, wherein the body contacting surface of the device is a film having a moisture vapour transmission rate of greater than 300 gm -2 24 h -1 at 37° C. at 100% to 10% relative humidity difference, the liquid is viscous and absorbs moisture vapour and is capable of deforming so as to distribute an applied pressure from the body contacting the surface evenly over the surface of the device and the flexible elastomeric envelope is formed in the shape of the letter "U".
Claim 2
Independent Claim
106 words
A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible elastomeric envelope having a body contacting surface, wherein the body contacting surface of the device is a film having a moisture vapour transmission rate of greater than 300 gm -2 24 h -1 at 37° C. at 100% to 10% relative humidity difference, the liquid is viscous and absorbs moisture vapour and is capable of deforming so as to distribute an applied pressure from the body contacting the surface evenly over the surface of the device and the flexible elastomeric envelope is formed in the shape of the letter "U".
Claim 3
Dependent Claim
68 words
A device as claiming in claim 1 in which the flexible elastomeric envelope in the shape of the letter `U` between 5 cm and 30 cm long, between 5 cm and 40 cm wide, and each arm of the device is suitably between 1 cm and 10 cm wide and the two arms are separated by a gap which has a width of 1 cm to 10 cm.
Claim 4
Dependent Claim
44 words
A device as claimed in claim 2 in which the flexible elastomeric envelope is in the shape of the letter `U` is between 10 and 20 cm long, 12 and 26 cm wide and each arm is between 2 cm and 6 cm wide.
Claim 5
Independent Claim
82 words
A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible elastomeric envelope in the shape of the letter "U" having a body contacting surface, wherein the body contacting surface of the device is a film having a moisture vapour transmission rate of greater than 300 gm -2 24 h -1 at 37° C. at 100% to 10% relative humidity difference, the liquid is a viscous liquid which absorbs moisture vapour and which contains a hygroscopic material.
Claim 6
Independent Claim
82 words
A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible elastomeric envelope in the shape of the letter "U" having a body contacting surface, wherein the body contacting surface of the device is a film having a moisture vapour transmission rate of greater than 300 gm -2 24 h -1 at 37° C. at 100% to 10% relative humidity difference, the liquid is a viscous liquid which absorbs moisture vapour and which contains a hygroscopic material.
Claim 7
Dependent Claim
26 words
A device as claimed in claim 4 in which the viscous liquid is an aqueous solution of polyvinyl alcohol and the hygroscopic material is sodium bromide.
Claim 8
Independent Claim
67 words
A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible, elastomeric envelope in which the body contacting surface of the device is a film having a moisture vapour transmission rate of greater than 300 gm -2 24 hr -1 at 37° C. at 100% to 10% relative humidity difference characterised in that the liquid is viscous and contains a hygroscopic material.
Claim 9
Independent Claim
67 words
A device for the prophylaxis of pressure sores which comprises a liquid retained within a flexible, elastomeric envelope in which the body contacting surface of the device is a film having a moisture vapour transmission rate of greater than 300 gm -2 24 hr -1 at 37° C. at 100% to 10% relative humidity difference characterised in that the liquid is viscous and contains a hygroscopic material.
Claim 10
Dependent Claim
42 words
A device as claimed in claim 6 in which the viscous liquid together with the hygroscopic material when contained in the device absorbs moisture vapour at a rate greater than 50 mg/72 hr/cm 2 of the skin contacting surface of the device.
Claim 11
Dependent Claim
36 words
A device as claimed in either of claim 6 in which the hygroscopic material is an inorganic material selected from the group consisting of anhydrous silica gel, anhydrous calcium chloride, anhydrous aluminium oxide and sodium bromide.
Claim 12
Dependent Claim
44 words
A device as claimed in claim 6 in which the viscous liquid has a viscosity of between 1500 and 6000 Poise when measured at 39° C. using a Ferranti-Shirley Core and Plate Viscometer with a 1 cm radius core and a 1200 g spring.
Claim 13
Dependent Claim
39 words
A device as claimed in claim 6 in which the viscous liquid is an aqueous solution of a polymer selected from the group consisting of polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polyethylene glycol, carboxymethyl cellulose, cellulose derivatives and vegetable gums.
Claim 14
Dependent Claim
30 words
A device as claimed in claim 6 in which the viscous liquid is selected from the group consisting of polyurethane, polyethylene glycol, propylene glycol and polyoxyethylene polyoxypropylene diol block copolymers.
Claim 15
Dependent Claim
26 words
A device as claimed in claim 6 in which the viscous liquid is an aqueous solution of polyvinyl alcohol and the hygroscope material is sodium bromide.
Claim 16
Dependent Claim
20 words
A device as claimed in claim 1 in which the body contacting surface of the device carries an adhesive layer.
Claim 17
Dependent Claim
19 words
A device as claimed in claim 1 in which the body contacting surface is a polyether ester block copolymer.
Claim 18
Dependent Claim
22 words
A device as claimed in claim 1 in which the flexible elastomeric envelope contains from 50 to 250 ml of viscous liquid.
Claim 19
Independent Claim
23 words
A device as claimed in either of claims 1 or 6 in which the device has thickness of from 0.5 to 3.0 cm.
Claim 20
Dependent Claim
20 words
A device as claimed in claim 6, in which the body contacting surface of the device carries an adhesive layer.
Claim 21
Dependent Claim
19 words
A device as claimed in claim 6, in which the body contacting surface is a polyether ester block copolymer.
Claim 22
Dependent Claim
22 words
A device as claimed in claim 6, in which the flexible elastomeric envelope contains from 50 to 250 ml of viscous liquid.
Claim 23
Dependent Claim
20 words
A device as claimed in claim 6, in which the device has a thickness of from 0.5 to 3.0 cm.
References Cited (Backward Citations)
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |