Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...
Patent
1994-09-14
1997-06-03
Phelan, D. Gabrielle
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Web, sheet or filament bases; compositions of bandages; or...
424449, 427 231, 427348, 602 47, A61F 1300
Patent
active
056352018
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and to an arrangement of apparatus for manufacturing wound dressings of the kind which comprise a perforated carrier material and a layer of hydrophobic silicone gel which lies against the wound, or sore, when the dressing is worn. The invention also relates to a wound dressing manufactured in accordance with the inventive method.
BACKGROUND OF THE INVENTION
A wound dressing of this kind is known from our European Patent No. 0,261,167, in which the carrier material is fully enclosed by the silicone gel although while leaving openings through the dressing. When manufacturing a dressing of this kind, the carrier material is dipped into a mixture of those components which, when cured, form the hydrophobic silicone gel, and the carrier material is then transferred to a curing oven in which the carrier material is cured. In order to ensure that the silicone gel is uniformly distributed on both sides of the carrier material and that the perforations do not become clogged with gel, the carrier material is guided in the oven in a relatively complicated path. This known method is not suited to high production rates.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method which will enable such wound dressings to be manufactured at a high production rate and in a simple and reliable manner.
The invention also relates to apparatus for carrying out the method and to a wound dressing suitable for manufacture by means of the inventive method.
To this end, an inventive method is characterized by applying a coating of a thermosetting silicone mixture to the upper surface of a perforated carrier material; blowing cold air onto the undersurface of the coated carrier material; and then applying heat to the silicone mixture until it has cured. The cold air blown onto the underside of the carrier material acts to blow the thick, viscous silicone mixture away from the perforations in the carrier material, so as to form through penetrating perforations and also to prevent clogging of the perforations in said carrier material. At the same time, the cold air flow ensures that the silicone mixture will not begin to cure before it has time to spread over the carrier material. The flow of air through the carrier material will, of course, also prevent the silicone mixture from running through the perforations in said material.
Apparatus for carrying out the aforedescribed method is characterized in that it includes means for coating the upper surface of the carrier material with a mixture of components which, when cured, form a silicone gel; an air-blowing unit for blowing cold air onto the underside of the carrier material, which is placed opposite the coating means, and means for delivering heat to the component mixture subsequent to having applied said mixture to the upper surface of the carrier material.
A wound dressing suited for manufacture by means of the aforesaid method is characterized in that the carrier material is impervious to air and fluid or only slightly permeable to air and fluid in the parts thereof lying between the perforations; and in that the carrier material has a silicone gel coating on solely one side thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to an exemplifying embodiment thereof and also with reference to the accompanying drawings, in which
FIG. 1 is a schematic perspective view of part of an inventive arrangement for manufacturing a wound dressing and also illustrates an exemplifying embodiment of an inventive wound dressing manufactured by means of said arrangement;
FIG. 2 is a cross-sectional view taken on the line II--II in FIG. 1; and
FIG. 3 is a cross-sectional view of another exemplifying embodiment of an inventive wound dressing.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 illustrates schematically part of an arrangement for manufacturing an inventive wound or sore dressing. The arrangement includes a unit in the form of an extr
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Molnlycke AB
Phelan D. Gabrielle
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