Absorbent medical articles
First Claim
1. A medical article comprising:
- a backing layer comprising backing adhesive on a front surface of the backing layer;
a liquid permeable facing layer;
an absorbent layer located between the backing layer and the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and
a water soluble film located between the front surface of the backing layer and the back surface of the absorbent layer;
wherein the water soluble film layer causes detachment of at least a portion of the absorbent layer from the backing layer after the absorbent layer has absorbed water or wound exudate.
2 Assignments
0 Petitions
Accused Products
Abstract
Medical articles including an absorbent layer, a backing layer and an optional liquid permeable facing layer are disclosed. The construction of the medical article is such that volumetric expansion of the absorbent layer is allowed in directions parallel to the surface of the backing layer as the absorbent layer absorbs moisture. The medical article may include a debonding agent located between the absorbent layer and the backing layer. The absorbent layer is operably attached to the backing layer. When the absorbent layer absorbs moisture, e.g., wound exudate, at least a portion of the absorbent layer detaches from the backing layer such that the absorbent layer can expand and move relative to the backing. The debonding agent facilitates this change from attachment to detachment of the absorbent layer to the backing. The medical articles of the present invention may also be constructed such that a portion of the front surface of the backing layer located directly opposite the absorbent layer is free of adhesive. The adhesive free area or areas may be provided in place of a physical debonding agent or in addition to a physical debonding agent.
77 Citations
111 Claims
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1. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; a liquid permeable facing layer; an absorbent layer located between the backing layer and the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a water soluble film located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the water soluble film layer causes detachment of at least a portion of the absorbent layer from the backing layer after the absorbent layer has absorbed water or wound exudate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; a liquid permeable facing layer; an absorbent layer located between the backing layer and the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a debonding agent located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the back surface of the absorbent layer is operably attached to the front surface of the backing layer before the medical article is applied to a patient, wherein at least a portion of the back surface of the absorbent layer is detached from the front surface of the backing layer when the absorbent layer has absorbed 100 wt-% or more of water, and wherein the combination of the backing layer, the facing layer, the absorbent layer, and the debonding agent are transparent when the absorbent layer has absorbed 100 wt-% of isotonic saline solution. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A medical article comprising:
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a moisture vapor permeable backing layer comprising backing adhesive on a front surface of the backing layer; a liquid permeable facing layer comprising a film that comprises a plurality of openings formed therethrough and facing adhesive on a front surface of the facing layer, wherein the backing layer and the backing adhesive extend past a perimeter of the facing layer such that the backing layer and the backing adhesive form a frame about the periphery of the facing layer; an absorbent layer located between the backing layer and the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer, wherein a back surface of the facing layer is attached to the front surface of the backing layer about a periphery of the absorbent layer, and wherein the absorbent layer is substantially free of water before the medical article is applied to a patient; and a water soluble debonding agent located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the back surface of the absorbent layer is operably attached to the front surface of the backing layer before the medical article is applied to a patient, and wherein at least a portion of the back surface of the absorbent layer is detached from the front surface of the backing layer when the absorbent layer has absorbed 100 wt-% or more of water; and wherein the combination of the backing layer, the facing layer, the absorbent layer, and the debonding agent are transparent when the absorbent layer has absorbed 100 wt-% isotonic saline solution.
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37. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; an absorbent layer located proximate the front surface of the backing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a debonding agent located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the back surface of the absorbent layer is operably attached to the front surface of the backing layer before the medical article is applied to a patient, and wherein at least a portion of the back surface of the absorbent layer is detached from the front surface of the backing layer when the absorbent layer has absorbed 100 wt-% or more of water, and wherein the combination of the backing layer, the absorbent layer, and the debonding agent are transparent when the absorbent layer has absorbed 100 wt-% of isotonic saline solution. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; an absorbent layer located proximate the front surface of the backing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a debonding agent located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the back surface of the absorbent layer is operably attached to the front surface of the backing layer before the medical article is applied to a patient, and wherein at least a portion of the back surface of the absorbent layer is detached from the front surface of the backing layer when the absorbent layer has absorbed 100 wt-% or more of water, and wherein the absorbent layer comprises a gel material comprising a homopolymer or copolymer of a multifunctional poly(alkylene oxide) free-radically polymerizable macromonomer having a weight average molecular weight of at least about 2000, wherein the multifunctional poly(alkylene oxide) macromonomer comprises a copolymeric random alkylene oxide moiety of the formula; - View Dependent Claims (53, 54, 55, 56)
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57. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; an absorbent layer located proximate the front surface of the backing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a debonding agent located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the back surface of the absorbent layer is operably attached to the front surface of the backing layer before the medical article is applied to a patient, and wherein at least a portion of the back surface of the absorbent layer is detached from the front surface of the backing layer when the absorbent layer has absorbed 100 wt-% or more of water, and wherein the absorbent layer comprises a gel material comprising a copolymer prepared from monomers comprising a multifunctional poly(alkylene oxide) free-radically polymerizable macromonomer having a weight average molecular weight of at least about 2000, wherein the multifunctional poly(alkylene oxide) macromonomer comprises a copolymeric alkylene oxide moiety of the formula; - View Dependent Claims (58, 59, 60, 61)
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62. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; an absorbent layer located proximate the front surface of the backing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a debonding agent located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the back surface of the absorbent layer is operably attached to the front surface of the backing layer before the medical article is applied to a patient, and wherein at least a portion of the back surface of the absorbent layer is detached from the front surface of the backing layer when the absorbent layer has absorbed 100 wt-% or more of water, and wherein the absorbent layer comprises a gel material comprising a polymerized multifunctional poly(alkylene oxide) free-radically polymerizable macromonomer having a weight average molecular weight of at least about 2000, wherein the multifunctional poly(alkylene oxide) macromonomer comprises a copolymeric alkylene oxide moiety of the formula; - View Dependent Claims (63, 64, 65, 66)
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67. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; a liquid permeable facing layer; an absorbent layer located between the backing layer and the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a water soluble film located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the water soluble film is operably attached to the back surface of the absorbent layer. - View Dependent Claims (68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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82. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; a liquid permeable facing layer; an absorbent layer located between the backing layer and the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a water soluble film located between the front surface of the backing layer and the back surface of the absorbent layer; wherein the water soluble film and the facing layer are operably attached to the backing layer by the backing adhesive. - View Dependent Claims (83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
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97. A medical article comprising:
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a backing layer comprising backing adhesive on a front surface of the backing layer; a liquid permeable facing layer comprising facing adhesive on a front surface of the facing layer; an absorbent layer located between the backing layer and the back surface of the facing layer, wherein a back surface of the absorbent layer faces the front surface of the backing layer; and a water soluble film located between the front surface of the backing layer and the back surface of the absorbent layer. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111)
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Specification