Patent US4540165A successfully refreshed from Google Patents.
Patent US3870041A successfully refreshed from Google Patents.
US3870041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical dressings
Assignee: BTR Industries Ltd
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Filing: 1973-08-16
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Granted: 1975-03-11
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Expires: 1993-08-16
Abstract
Abstract The specification discloses a surgical or wound dressing of the kind comprising a backing strip one side of which has an adhesive facing and an absorbent pad on said one side of the backing strip, in which dressing a film of elastomeric material of a synthetic or natural rubber alone or compounded with other ingredients overlying the absorbent pad, the film being perforated with deformable pores to allow exudate from a wound to which the dressing is applied to be absorbed by the pad and to permit scab portions to pass freely therethrough.
Inventors
- 👤 Graham Leighton Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:58
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/02; A61F13/0203; A61F13/0206; A61F13/0223; A61F13/0226; A61F2013/00089; A61F2013/00217
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
103 words
An improved surgical or wound dressing of the kind comprising a backing strip one side of which has an adhesive facing, a resilient absorbent pad on said one side of the backing strip, and a means for contacting and conforming to the wound surface comprising a covering layer overlying the absorbent pad of a readily stretchable film of elastomeric material which has a thickness not greater than 0.010 inch and a means for permitting wound scab and exudate from a wound to which the dressing is applied to be readily passed there through comprising deformable spaced perforations in said elastomeric covering material layer.
Claim 2
Dependent Claim
103 words
An improved surgical or wound dressing of the kind comprising a backing strip one side of which has an adhesive facing, a resilient absorbent pad on said one side of the backing strip, and a means for contacting and conforming to the wound surface comprising a covering layer overlying the absorbent pad of a readily stretchable film of elastomeric material which has a thickness not greater than 0.010 inch and a means for permitting wound scab and exudate from a wound to which the dressing is applied to be readily passed there through comprising deformable spaced perforations in said elastomeric covering material layer.
Claim 3
Dependent Claim
103 words
An improved surgical or wound dressing of the kind comprising a backing strip one side of which has an adhesive facing, a resilient absorbent pad on said one side of the backing strip, and a means for contacting and conforming to the wound surface comprising a covering layer overlying the absorbent pad of a readily stretchable film of elastomeric material which has a thickness not greater than 0.010 inch and a means for permitting wound scab and exudate from a wound to which the dressing is applied to be readily passed there through comprising deformable spaced perforations in said elastomeric covering material layer.
Claim 4
Dependent Claim
103 words
An improved surgical or wound dressing of the kind comprising a backing strip one side of which has an adhesive facing, a resilient absorbent pad on said one side of the backing strip, and a means for contacting and conforming to the wound surface comprising a covering layer overlying the absorbent pad of a readily stretchable film of elastomeric material which has a thickness not greater than 0.010 inch and a means for permitting wound scab and exudate from a wound to which the dressing is applied to be readily passed there through comprising deformable spaced perforations in said elastomeric covering material layer.
Claim 5
Dependent Claim
21 words
A dressing as claimed in claim 1 wherein the thickness of the film is in the range 0.0005 to 0.003 inch.
Claim 6
Dependent Claim
33 words
A dressing as claimed in claim 1 wherein the edges of the film extend beyond the absorbent pad and adhere to the adhesive facing to hold the film in position over the pad.
Claim 7
Dependent Claim
20 words
A dressing as claimed in claim 1 wherein the film is made of gutta percha or gutta percha like material.
Claim 8
Dependent Claim
22 words
A dressing as claimed in claim 1 wherein the film is made of polychloroprene or polychloroprene compounded with other elastomers and/or fillers.
Claim 9
Dependent Claim
22 words
A dressing as claimed in claim 1 wherein the film is made of trans-polyisoprene or trans-polyisoprene compounded with other elastomers and/or fillers.
Claim 10
Dependent Claim
21 words
A dressing as claimed in claim 1 wherein the natural or synthetic rubber in the film is compounded with plastics polymers.
Claim 11
Dependent Claim
13 words
A dressing as claimed in claim 7 wherein the plastics polymer is polyethylene.
Claim 12
Dependent Claim
19 words
A dressing as claimed in claim 8 wherein the polyethylene is compounded with low molecular weight polymers of polyisobutylene.
Claim 13
Dependent Claim
18 words
A dressing as claimed in claim 1 wherein the film includes additives which promote healing of a wound.
Claim 14
Dependent Claim
29 words
A dressing as claimed in claim 1 wherein the diameter of each perforation in the film is substantially 0.5 mm. and there are substantially 100 perforations per square centimetre.
Claim 15
Dependent Claim
16 words
A dressing as claimed in claim 1 wherein the elastomeric material is natural or synthetic rubber.
Claim 16
Dependent Claim
15 words
A dressing as claimed in claim 12 wherein the rubber is compounded with other ingredients.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |