Polymeric sheets as synthetic medical dressings or coverings for wounds

• US 4,034,751 A
• Filed: 11/24/1975
• Issued: 07/12/1977
• Est. Priority Date: 11/24/1975
• Status: Expired due to Term

• Current Assignee: International Paper Company
• Original Assignee: International Paper Company
• Inventors: Hung, John Hui-hsiung
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Gron, T. S.
• Application Number:
  US05/634,908
• Time in Patent Office: 596 Days
• Field of Search: 128/155-157, 128/149, 128/268, 3/1, 264/334, 264/344, 264/175, 264/174, 264/171, 264/173, 264/37, 264/128, 156/77, 156/155, 57/140 R, 57/157 R, 428/188, 428/255, 428/292, 428/224, 428/376
• US Class Current: 602/52
• CPC Class Codes: A61F 13/01017 synthetic, e.g. polymer based
• CPC Class Codes: A61F 13/01046 Air-vapor permeability
• CPC Class Codes: A61F 13/534 having an inhomogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence; homogeneous cores with tissue wrapping A61F13/53
• CPC Class Codes: A61F 2013/00119 elastic
• CPC Class Codes: A61F 2013/00157 for burns or skin transplants A61F2013/00187 takes precedence; not adhering to the wound A61F2013/00217
• CPC Class Codes: A61F 2013/00182 with transparent part
• CPC Class Codes: A61F 2013/00263 vapour permeability >500 g/m2/24h
• CPC Class Codes: A61F 2013/00519 for treating burn
• CPC Class Codes: A61F 2013/00744 containing non-woven
• CPC Class Codes: A61F 2013/00846 with transparent or translucent part
• CPC Class Codes: A61F 2013/00876 vapour permeability >500 g/mg/24h
• CPC Class Codes: A61F 2013/0091 with disinfecting or anaesthetics means, e.g. anti-mycrobic
• CPC Class Codes: A61F 2013/53445 from several sheets
• CPC Class Codes: A61L 15/26 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: Y10T 428/24744 Longitudinal or transverse tubular cavity or cell
• CPC Class Codes: Y10T 428/2935 Discontinuous or tubular or cellular core

Abstract

Polymeric sheets having on one or both sides a fabric texture and a network of elongated channels in the interior of the structural framework of the sheet. In one embodiment, the sheets comprise a plurality of interbonded continuous polymeric ribs extending in a direction parallel to the plane of the sheet. The ribs impart a fabric texture to both sides of the sheet and define between them recessed portions on each surface of the sheet. The elongated channels extend throughout the ribs. The open area between the ribs can vary from zero to 60%. In another embodiment, the sheets have an ultra-thin, pinhole-free silicone rubber membrane on one side and a fabric texture on the other side. The sheets are useful as burn coverings where they serve as synthetic temporary replacements for damaged or missing skin. The sheets have physiologic properties similar to human skin, excellent drapability characteristics, recessed portions which provide a reservoir for wound debris and, in certain embodiments, a dermal surface which permits wound adherence by fibroblastic ingrowth.

Claims

1. A synthetic medical dressing or covering for wounds comprising an integral, continuous, non-woven, non-fibrous, non-filamentary, non-foamed, drapable polymeric sheet at least one side of which has a fabric texture and comprises a plurality of interbonded continuous polymeric ribs defining between them recessed portions in said at least one side of the sheet, said ribs containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within said ribs which extend continuously throughout said at least one side of the sheet, said sheet having a water vapor phase transfer rate of about 2 to 20 mg./hr.-cm.², two dimensional elongation of at least about 100% in each direction, and an open area between the ribs of zero to about 60%.

2. The synthetic medical dressing or covering of claim 1 further including exteriorly located elongated continuous channels in the surface of said at least one side of the sheet which extend substantially parallel to the plane of the sheet.

3. The synthetic medical dressing or covering of claim 1 wherein one side of said sheet is a pinhole-free silicone rubber membrane layer whose thickness is less than about 2 mils, and wherein said sheet has anti-microbial barrier layer properties and a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm.².

4. The synthetic medical dressing or covering of claim 1 formed of silicone rubber.

5. The synthetic medical dressing or covering of claim 1 having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm.² and an open area of about 10 to 50%.

6. The synthetic medical dressing or covering of claim 4 having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm.² and an open area of about 10 to 50%.

7. A synthetic medical dressing or covering for wounds comprising an integral, continuous, non-laminated, non-woven, non-fibrous, non-filamentary, non-foamed, drapable polymeric sheet each side of which has a fabric texture, said sheet comprising a plurality of interbonded continuous polymeric ribs defining between them recessed portions on each side of said sheet, said ribs containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within said ribs which extend continuously throughout said ribs, said sheet having a water vapor phase transfer rate of about 2 to 20 mg./hr.-cm.², two dimensional elongation of at least about 100% in each direction and an open area between the ribs of zero to about 60%.

8. The synthetic medical dressing or covering of claim 7 wherein the elongated continuous channels are of filamentary configuration and have a length to diameter ratio of at least about 100 and a diameter of about 0.1 to 5 mils.

9. The synthetic medical dressing or covering of claim 7 formed entirely from silicone rubber, and having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm.² and an open area between the ribs of about 10 to 50%.

10. A synthetic medical dressing or covering for wounds comprising a drapable sheet having a fabric texture on one surface thereof comprising an integral, unified, non-laminated continuous sheet of polymeric material having on one side thereof a thin membrane layer whose thickness does not exceed about 2 mils and on the other side thereof a fabric texture formed by portions of said polymeric material which project from said membrane layer and form a continuous phase with said membrane layer, said portions of said polymeric material which project containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within the sheet, said sheet having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm.², and anti-microbial barrier layer properties.

11. The synthetic medical dressing or covering of claim 10 wherein said polymeric material is silicone rubber.