Extensible dressings
The present invention generally relates to dressings such as bandages or tapes having improved extensibility and conformability to human skin and joints.
1. A dressing comprising:
a layer of non-cellulosic material having:
(i) a length direction (L), a width direction (W), and a thickness direction (T) respectively defining axes in three mutually orthogonal directions, the length direction (L) and the width direction W defining a horizontal plane (“the LW plane”), and the thickness direction (T) defining an up-down direction or a vertical direction relative to the LW plane, the layer of material having a thickness taken in the thickness direction; and
(ii) a plurality of material free regions, each of the material free regions extending through the thickness of at least a portion of the layer of material and the plurality of the material free regions being arranged in the form of a pattern of concentric slitted annuli having a center point (P) in the LW plane, the pattern of concentric slitted annuli having, relative to center point P, a radially innermost concentric annulus and a radially outermost concentric annulus, the innermost and the outermost concentric annuli respectively having the shortest and the longest diameters,
wherein the plurality of the material free regions is arranged end to end, separated by a plurality of spatial intervals, such that any material free region In located in any concentric annulus I subtends a non-zero valued angle, α In , at the center point P, where n represents the number identifying a material free region in an annulus having material free regions arranged numerically consecutively in such annulus,
wherein the sum of the non-zero valued angles subtended by the plurality of the material free regions at the center point P, within any one of the concentric annuli, is less than 360 degrees, and
wherein the material free regions of any one of the concentric annuli are in a radially staggered relation with respect to the material free regions in any adjacent inner and/or adjacent outer concentric annulus,
wherein material free regions that are resiliently openable in the thickness direction T of the dressing to expand at least a portion of the dressing into a three dimensional configuration that is conformable to a three dimensional contour of a skin surface to which the dressing may be applied.
2. The dressing of claim 1 further including one or more intervening concentric annuli disposed between the innermost and outermost concentric annuli.
3. The dressing of claim 2 , wherein any of the one or more intervening concentric annuli has a larger diameter than the diameter of any adjacent inner concentric annulus with respect to the intervening concentric annulus.
4. The dressing of claim 1 , wherein the innermost concentric annulus has a diameter ranging from about 0.125″ to about 3.5″.
5. The dressing of claim 1 , wherein the outermost concentric annulus has a diameter ranging from about 0.125″ to about 0.25″.
6. The dressing of claim 1 , wherein the innermost concentric annulus has a diameter ranging from about 0.125 to about 0.5″ and the outermost concentric annulus has a diameter ranging from about 0.5″ to about 1″.
7. The dressing of claim 1 , wherein any pair of adjacent concentric annuli is spaced apart radially by a distance that is the difference between the respective radial distances of the adjacent concentric annuli from the center point P.
8. The dressing of claim 1 , wherein each of the plurality of spatial intervals separating the plurality of material free regions within any given concentric annulus has a size that has a minimal value within the innermost concentric annulus and increases in value with each successive radially outer concentric annulus to its maximum value within the outermost concentric annulus of the pattern of concentric slitted annuli.
9. The dressing of claim 1 , wherein any spatial interval within any given concentric annulus subtends an angle θ at the center P and further wherein the angle θ has a value that ranges from about 3° to 20°.
10. A dressing comprising:
a layer of non-cellulosic material having:
(i) a length direction (L), a width direction (W), and a thickness direction (T) respectively defining axes in three mutually orthogonal directions, the length direction (L) and the width direction W defining a horizontal plane (“the LW plane”), and the thickness direction (T) defining an up-down direction or a vertical direction relative to the LW plane, the layer of material having a thickness taken in the thickness direction; and
(ii) a plurality of material free regions, each of the material free regions extending through the thickness of at least a portion of the layer of material and the plurality of the material free regions being arranged in the form of a pattern of concentric slitted annuli having a center point (P) in the LW plane, the pattern of concentric slitted annuli having, relative to center point P, a radially innermost concentric annulus and a radially outermost concentric annulus, the innermost and the outermost concentric annuli respectively having the shortest and the longest diameters,
wherein the plurality of the material free regions is arranged end to end, separated by a plurality of spatial intervals, such that any material free region In located in any concentric annulus I subtends a non-zero valued angle, α In , at the center point P, where n represents the number identifying a material free region in an annulus having material free regions arranged numerically consecutively in such annulus,
wherein the sum of the non-zero valued angles subtended by the plurality of the material free regions at the center point P, within any one of the concentric annuli, is less than 360 degrees, and
wherein the material free regions of any one of the concentric annuli are in a radially staggered relation with respect to the material free regions in any adjacent inner and/or adjacent outer concentric annulus,
wherein material free regions are resiliently openable in the thickness direction T of the dressing to expand at least a portion of the dressing into a three dimensional configuration that is conformable to a three dimensional contour of a skin surface to which the dressing may be applied, and
wherein any material free region of any radially concentric annulus has an axis of symmetry bisecting the angle subtended by the material free region at the center point P.
11. The dressing of claim 10 , wherein the axis of symmetry of any material free region of the radially innermost concentric annulus is radially staggered from the axis of symmetry of any proximate material free regions located in the radially outermost concentric annulus, by an angle φ that has a value ranging from about 5° to about 40°.
12. The dressing of claim 10 , wherein the axis of symmetry of any material free region in any one of the concentric annuli is radially staggered from the axis of symmetry of any proximate material free regions located in any adjacent radially inner or outer concentric annulus with respect to the concentric annulus by an angle φ that has a value ranging from about 5° to about 30°.
13. A dressing comprising:
a layer of non-cellulosic material having:
(i) a length direction (L), a width direction (W), and a thickness direction (T) respectively defining axes in three mutually orthogonal directions, the length direction (L) and the width direction W defining a horizontal plane (“the LW plane”), and the thickness direction (T) defining an up-down direction or a vertical direction relative to the LW plane, the layer of material having a thickness taken in the thickness direction; and
(ii) a plurality of material free regions, each of the material free regions extending through the thickness of at least a portion of the layer of material and the plurality of the material free regions being arranged in the form of a pattern of concentric slitted annuli having a center point (P) in the LW plane, the pattern of concentric slitted annuli having, relative to center point P, a radially innermost concentric annulus and a radially outermost concentric annulus, the innermost and the outermost concentric annuli respectively having the shortest and the longest diameters,
wherein the plurality of the material free regions is arranged end to end, separated by a plurality of spatial intervals, such that any material free region In located in any concentric annulus I subtends a non-zero valued angle, α In , at the center point P, where n represents the number identifying a material free region in an annulus having material free regions arranged numerically consecutively in such annulus,
wherein the sum of the non-zero valued angles subtended by the plurality of the material free regions at the center point P, within any one of the concentric annuli, is less than 360 degrees, and
wherein the material free regions of any one of the concentric annuli are in a radially staggered relation with respect to the material free regions in any adjacent inner and/or adjacent outer concentric annulus,
wherein material free regions are resiliently openable in the thickness direction T of the dressing to expand at least a portion of the dressing into a three dimensional configuration that is conformable to a three dimensional contour of a skin surface to which the dressing may be applied, and
wherein:
(a) any material free region In further has an axis of symmetry that bisects the non-zero valued angle α In ;
(b) any material free region Kn located in any concentric annulus K that is adjacent to concentric annulus I and proximate to material free region In, subtends a non-zero valued angle α Kn at the center point P and has an axis of symmetry that bisects the non-zero valued angle α Kn ;
(c) the axis of symmetry of the material free region In is staggered by an angle φ from the axis of symmetry of the material free region Kn; and
(d) the angle φ has a value that falls within a range specified by the equation: 0° <φ<(α In +α Kn ).
14. A dressing comprising:
a layer of non-cellulosic material having:
(i) a length direction (L), a width direction (W), and a thickness direction (T) respectively defining axes in three mutually orthogonal directions, the length direction (L) and the width direction W defining a horizontal plane (“the LW plane”), and the thickness direction (T) defining an up-down direction or a vertical direction relative to the LW plane, the layer of material having a thickness taken in the thickness direction; and
(ii) a plurality of material free regions, each of the material free regions extending through the thickness of at least a portion of the layer of material and the plurality of the material free regions being arranged in the form of a pattern of concentric slitted annuli having a center point (P) in the LW plane, the pattern of concentric slitted annuli having, relative to center point P, a radially innermost concentric annulus and a radially outermost concentric annulus, the innermost and the outermost concentric annuli respectively having the shortest and the longest diameters,
wherein the plurality of the material free regions is arranged end to end, separated by a plurality of spatial intervals, such that any material free region In located in any concentric annulus I subtends a non-zero valued angle, α In , at the center point P, where n represents the number identifying a material free region in an annulus having material free regions arranged numerically consecutively in such annulus,
wherein the sum of the non-zero valued angles subtended by the plurality of the material free regions at the center point P, within any one of the concentric annuli, is less than 360 degrees, and
wherein the material free regions of any one of the concentric annuli are in a radially staggered relation with respect to the material free regions in any adjacent inner and/or adjacent outer concentric annulus,
wherein material free regions are resiliently openable in the thickness direction T of the dressing to expand at least a portion of the dressing into a three dimensional configuration that is conformable to a three dimensional contour of a skin surface to which the dressing may be applied, and wherein each concentric annulus has a concentric centerline.
15. The dressing of claim 14 , wherein the pattern of concentric slitted annuli has equal radial spacing between neighboring concentric centerlines of successive pairs of neighboring concentric annuli.
16. The dressing of claim 14 , wherein any pair of neighboring concentric centerlines of a pair of neighboring concentric annuli is separated by a radial spacing that varies among different pairs of neighboring concentric centerlines of successive pairs of neighboring concentric annuli of the pattern of concentric slitted annuli.
17. The dressing of claim 16 , wherein the pattern of concentric slitted annuli has a radial spacing between pairs of neighboring concentric centerlines of neighboring concentric annuli that increases radially outwardly from the center point P.
18. The dressing of claim 16 , wherein the pattern of concentric slitted annuli has a radial spacing between pairs of neighboring concentric centerlines of neighboring concentric annuli that decreases radially outwardly from the center point P.
19. The dressing of claim 14 , wherein the pattern of concentric slitted annuli has a radial spacing between each pair of neighboring concentric centerlines of successive pairs of neighboring concentric annuli that varies among different pairs of neighboring concentric annuli.