COMPOSITE DRESSINGS WITH EVEN EXPANSION PROFILES FOR TREATMENT OF WOUNDS USING NEGATIVE-PRESSURE TREATMENT
Dressings for tissue treatment, which may comprise a first layer and a second layer. The first layer may comprise or consist essentially of a first plurality of perforations formed through the first layer and arranged in a first pattern of rows. Each of the first plurality of perforations may be parallel to a first direction. The first layer may comprise or consist essentially of a second plurality of perforations formed through the second layer and arranged in a second pattern of rows. Each of the second plurality of perforations may be parallel to a second direction. The first plurality of perforations and the second plurality of perforations may be configured to open in response to a pressure gradient across the first layer. A second layer may comprise or consist essentially of a manifold, and coupled to the first layer.
1 . A dressing for treating a tissue site, the dressing comprising:
a first layer comprising:
a plurality of first perforations arranged in a first pattern of rows, each of the first perforations parallel to a first direction, and
a plurality of second perforations arranged in a second pattern of rows, each of the second perforations parallel to a second direction; and
a second layer coupled to the first layer, the second layer comprising a manifold.
2 . The dressing of claim 1 , wherein the first perforations and the second perforations are configured to open in response to a pressure gradient across the first layer.
3 . The dressing of the claim 1 , wherein the first pattern of rows has a first pitch P 1 in a range of about 4 millimeters to about 6 millimeters.
4 . The dressing of claim 1 , wherein the second pattern of rows has a second pitch P 2 in a range of about 3 millimeters to about 6 millimeters.
5 . The dressing of claim 1 , wherein the first perforations in each of the first pattern of rows are spaced a first distance D 1 in a range of about 3 millimeters to about 5 millimeters.
6 . The dressing of claim 1 , wherein the second perforations in each of the second pattern of rows are spaced a second distance D 2 in a range of about 3 millimeters to about 5 millimeters.
7 . The dressing of claim 1 , wherein the first direction is orthogonal to the second direction.
8 . The dressing of claim 1 , wherein the first direction is parallel to the second direction.
9 . The dressing of claim 1 , wherein the first layer comprises an edge and the first direction is parallel to the edge.
10 . The dressing of claim 1 , wherein the first direction is rotated a first angle θ in a range of about 0° to about 90° with respect to an edge of the first layer.
11 . The dressing of claim 10 , wherein θ is about 45°.
12 . The dressing of claim 1 , wherein the first layer comprises an edge and the second direction is orthogonal to the edge.
13 . The dressing of claim 10 , wherein the second direction is rotated a second angle φ in a second range of about 0° to about 180° with respect to an edge of the first layer in a same direction as the first angle θ.
14 . The dressing of claim 13 , wherein φ is about 135°.
15 . The dressing of claim 1 , wherein each of the first perforations has a centroid incident to a reference line parallel to a third direction.
16 . The dressing of claim 15 , wherein the third direction is orthogonal to the first direction.
17 . The dressing of claim 1 , wherein each of the first perforations and the second perforations has a centroid, and the centroid of each of the first perforations is aligned with the centroid of one of the second perforations along a third direction.
18 . The dressing of claim 1 , wherein each of the second perforations has a centroid incident to a second reference line parallel to a fourth direction.
19 . The dressing of claim 18 , wherein the fourth direction is parallel to the first direction.
20 . The dressing of claim 1 , wherein each of the first perforations and the second perforations has a centroid, and the centroid of each of the second perforations is aligned with the centroid of one of the first perforations along a fourth direction.
21 . The dressing of claim 1 , wherein each of the first perforations and the second perforations has a centroid, and the centroid of each of the first perforations is coincident with the centroid of one of the second perforations.
22 . The dressing of claim 1 , wherein the first pattern of rows is staggered a third angle β, wherein β is about 45°.
23 . The dressing of claim 1 , wherein the second pattern of rows is staggered a fourth angle γ, wherein γ is about 135°.
24 . The dressing of claim 1 , wherein each of the first perforations is a linear slit.
25 . The dressing of claim 1 , wherein each of the first perforations is a curved slit.
26 . The dressing of claim 1 , wherein each of the first perforations is a chevron slit.
27 . The dressing of claim 1 , wherein each of the second perforations is a linear slit.
28 . The dressing of claim 1 , wherein each of the second perforations is a curved slit.
29 . The dressing of claim 1 , wherein each of the second perforations is a chevron slit.
30 . The dressing of claim 1 , wherein the first layer comprises a margin without perforations.
31 . The dressing of claim 35 , wherein the margin is between about 30% to about 80% of an area of the first layer.
32 . The dressing of claim 1 , wherein the first layer is configured to be interposed between the manifold and the tissue site and at least partially exposed to the tissue site.
33 . The dressing of claim 1 , wherein the first layer comprises a polymer film.
34 . The dressing of claim 33 , wherein the polymer film is hydrophobic.
35 . The dressing of claim 34 , wherein the polymer film has a contact angle with water greater than 90 degrees.
36 . The dressing of claim 34 , wherein the polymer film is a polyethylene film.
37 . The dressing of claim 34 , wherein the polymer film is a polyethylene film having an area density of less than 30 grams per square meter.
38 . The dressing of claim 34 , wherein the polymer film is a polyurethane film.
39 . The dressing of claim 1 , wherein the second layer comprises a foam.
40 . The dressing of claim 1 , wherein the second layer comprises a reticulated foam.
41 . The dressing of claim 40 , wherein the reticulated foam has a thickness of between about 4 millimeters to about 8 millimeters.
42 . The dressing of claim 1 , wherein the second layer comprises a felted foam.
43 . The dressing of claim 42 , wherein the felted foam has a thickness of in a range of about 1 millimeter to about 3 millimeters.
44 . The dressing of claim 1 , further comprising a third layer coupled to the second layer opposite the first layer, the third layer comprising a polymer drape.
45 . The dressing of claim 1 , further comprising a fourth layer coupled to the first layer opposite the second layer, the fourth layer comprising a hydrophobic gel having a plurality of apertures.
46 . The dressing of claim 45 , wherein the plurality of apertures are in registration with the first plurality of perforations and the second plurality of perforations.
47 . A dressing for treating a tissue site, the dressing comprising:
a first layer comprising a polymer film having a pattern of slots configured to expand in response to a pressure gradient across the polymer film; and
a second layer coupled to the first layer, the second layer comprising a manifold.
48 . The dressing of claim 47 , further comprising a third layer coupled to the second layer opposite the first layer, the third layer comprising a polymer drape.
49 . The dressing of claim 47 , further comprising a fourth layer coupled to the first layer opposite the second layer, the fourth layer comprising a hydrophobic gel having a plurality of apertures.
50 . The dressing of claim 47 , wherein the pattern comprises a staggered pattern.
51 . The dressing of claim 47 , wherein the pattern comprises staggered rows.
52 . The dressing of claim 47 , wherein the pattern comprises a cross-pitch pattern.
53 . The dressing of claim 47 , wherein the pattern comprises a herringbone pattern.
54 . The dressing of claim 47 , wherein the pattern comprises mirrored rows.
55 . The dressing of claim 47 , wherein the pattern comprises offset rows.
56 . The dressing of claim 47 , wherein the pattern comprises rotated slots.
57 . The dressing of claim 47 , wherein each slot is a curved slit.
58 . The dressing of claim 47 , wherein the pattern comprises rows.
59 . The dressing of claim 58 , wherein each slot has a length that is parallel to the rows.
60 . A dressing for treating a tissue site, the dressing comprising:
a tissue interface having a first surface and a second surface;
a first plurality of slots in at least the first surface configured to expand in response to a pressure gradient across the tissue interface; and
a second plurality of slots in the first surface configured to expand in response to the pressure gradient across the tissue interface, the second plurality of slots rotated an angle greater than zero degrees with respect to the first plurality of slots.
61 . The dressing of claim 60 , wherein the first plurality of slots and the second plurality of slots are linear slots.
62 . The dressing of claim 60 , wherein the angle is about ninety degrees.
63 . The dressing of claim 62 , wherein:
the first plurality of slots and the second plurality of slots are arranged in rows; and
each of the first plurality of slots is aligned along a line intersecting with centroids of the second plurality of slots.
64 . The dressing of claim 60 , wherein the first plurality of slots and the second plurality of slots are curved slots.
65 . The dressing of claim 60 wherein the first plurality of slots and the second plurality of slots are chevron slots.
66 . The dressing of claim 60 , wherein the first plurality of slots and the second plurality of slots are split-chevron slots.
67 . The dressing of any of claims 64 - 66 , wherein the angle is 45 degrees.
68 . The dressing of any of claims 60 - 67 , wherein the tissue interface comprises:
a spacer manifold;
a first film layer adjacent to the spacer manifold and forming the first surface of the tissue interface; and
a second film layer adjacent to the spacer manifold and forming the second surface of the tissue interface.
69 . The dressing of any of claims 60 - 67 , wherein the first plurality of slots and the second plurality of slots are linear slits.