Patent US5197945A successfully refreshed from Google Patents.
US5197945A
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US
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Alginate wound dressing of good integrity
Assignee: 3M Co
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Filing: 1992-01-14
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Granted: 1993-03-30
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Expires: 2012-01-14
Abstract
Abstract A wound dressing of alginate staple fibers has improved integrity when its fibers have been hydroentangled. Even when its basis weight is as low as 50 g/m 2 , the resulting wound dressing, when saturated with saline fluids, can be removed by forceps from a wound as a single piece, having little or no residue in the wound. At basis weights below 50 g/m 2 , the wound dressing preferably includes reinforcing fibers such as rayon.
Inventors
- 👤 Susan M. Cole
- 👤 David L. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:01
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/01; A61F13/01008; A61F13/00051; A61F13/00063; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/425; D04H1/4258; D04H1/4266; D04H1/4374; D04H1/4382; D04H1/43835; D04H1/44; D04H1/46; D04H1/492; A61F2013/00089; A61F2013/00157; A61F2013/00182; A61F2013/00217; A61F2013/00221; A61F2013/00229; A61F2013/00361; A61F2013/00365; A61F2013/00463; A61F2013/00472; A61F2013/00727; A61F2013/00731; A61F2013/00744; A61F2013/00748; A61F2013/00846; A61F2013/00902; A61F2013/00927; A61F2013/00931
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
83 words
A wound dressing comprising a nonwoven fabric consisting of at least 35% by weight of alginate staple fibers, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that a plot of the fabric's tensile strength vs. basis weight lies above line 12 of FIG. 1 of the drawing when the fabric is dry and lies above line 22 of FIG. 2 when the fabric is saturated with saline water.
Claim 2
Dependent Claim
83 words
A wound dressing comprising a nonwoven fabric consisting of at least 35% by weight of alginate staple fibers, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that a plot of the fabric's tensile strength vs. basis weight lies above line 12 of FIG. 1 of the drawing when the fabric is dry and lies above line 22 of FIG. 2 when the fabric is saturated with saline water.
Claim 3
Dependent Claim
23 words
A wound dressing as defined in claim 1 wherein the nonwoven fabric has a basis weight of at least 20 g/m 2 .
Claim 4
Dependent Claim
24 words
A wound dressing as defined in claim 2, the fabric of which has a basis weight of from 50 to 180 g/m 2 .
Claim 5
Dependent Claim
44 words
A wound dressing as defined in claim 3, the fabric of which has a basis weight of at least 60 g/m 2 and has sufficient integrity to permit it to be converted into strips as narrow as 5 mm using a continuous slitting process.
Claim 6
Dependent Claim
28 words
A wound dressing as defined in claim 1, wherein substantially all of the staple alginate fibers of the nonwoven fabric are from 2 to 10 cm in length.
Claim 7
Dependent Claim
15 words
A wound dressing as defined in claim 1 wherein the fabric further comprises reinforcing fibers.
Claim 8
Dependent Claim
15 words
A wound dressing as defined in claim 1 wherein the fabric further comprises chitosan fibers.
Claim 9
Dependent Claim
44 words
A wound dressing as defined in claim 1 and having a highly open structure so that when the dressing is saturated with saline fluids, it is sufficiently translucent in contact with a wound to permit the wound to be inspected without removing the dressing.
Claim 10
Dependent Claim
15 words
A wound dressing as defined in claim 1 and containing at least one therapeutic agent.
Claim 11
Dependent Claim
72 words
A wound dressing comprising a nonwoven fabric comprising at least 35% by weight of alginate staple fibers, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that the fabric has a Web Dry Strength of at least 0.01 N/g/m 2 and a Web Wet Strength of at least as herein defined of at least 0.005 N/g/m 2 .
Claim 12
Dependent Claim
72 words
A wound dressing comprising a nonwoven fabric comprising at least 35% by weight of alginate staple fibers, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that the fabric has a Web Dry Strength of at least 0.01 N/g/m 2 and a Web Wet Strength of at least as herein defined of at least 0.005 N/g/m 2 .
Claim 13
Dependent Claim
20 words
A wound dressing as defined in claim 10 wherein the Web Dry Strength is at least 0.03 N/g/m 2 .
Claim 14
Dependent Claim
20 words
A wound dressing as defined in claim 10 wherein the Web Wet Strength is at least 0.02 N/g/m 2 .
Claim 15
Independent Claim
107 words
A method of dressing a wound comprising the steps of: (a) preparing an alginate wound dressing comprising a nonwoven fabric comprising at least 35% by weight of alginate staple fibers, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that a plot of the fabric's tensile strength vs. basis weight lies above line 12 of FIG. 1 of the drawing when the fabric is dry and lies above line 22 of FIG. 2 of the drawing when the fabric is saturated with saline water, and (b) applying that wound dressing to the wound.
Claim 16
Independent Claim
107 words
A method of dressing a wound comprising the steps of: (a) preparing an alginate wound dressing comprising a nonwoven fabric comprising at least 35% by weight of alginate staple fibers, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that a plot of the fabric's tensile strength vs. basis weight lies above line 12 of FIG. 1 of the drawing when the fabric is dry and lies above line 22 of FIG. 2 of the drawing when the fabric is saturated with saline water, and (b) applying that wound dressing to the wound.
Claim 17
Dependent Claim
24 words
A method as defined in claim 13 and including prior to step (b) the step of saturating the alginate wound dressing with saline fluid.
Claim 18
Dependent Claim
34 words
A method as defined in claim 13 and including the step of covering the wound dressing applied in step (b) with a material selected from film dressings, gauze dressings, hydrocolloid dressings, and bandage wraps.
Claim 19
Dependent Claim
43 words
A wound dressing as defined in claim 1 wherein the nonwoven fabric retains measurable saline moisture for at least 6 hours after it is removed from the saline bath, stored on a flat open tray at 25 degrees C. and 70% relative humidity.
Claim 20
Dependent Claim
21 words
A wound dressing as defined in claim 1 wherein the nonwoven fabric comprises at least 50% by weight of alginate fibers.
Claim 21
Dependent Claim
27 words
A wound dressing as defined in claim 1 wherein the balance of the fabric comprises a fiber selected from the group consisting of rayon, cotton or nylon.
Claim 22
Dependent Claim
100 words
A wound dressing comprising a nonwoven fabric of layered fiber webs, wherein at least one layer is a predominantly alginate fiber web and one layer is a fiber web that is not predominantly alginate fiber, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that a plot of the fabric's tensile strength vs. basis weight lies above line 12 of FIG. 1 of the drawing when the fabric is dry and lies above line 22 of FIG. 2 when the fabric is saturated with saline water.
Claim 23
Dependent Claim
100 words
A wound dressing comprising a nonwoven fabric of layered fiber webs, wherein at least one layer is a predominantly alginate fiber web and one layer is a fiber web that is not predominantly alginate fiber, which fabric is substantially free from any adhesive binder or of interfusing of fibers at their crossing points, said fibers being sufficiently entangled that a plot of the fabric's tensile strength vs. basis weight lies above line 12 of FIG. 1 of the drawing when the fabric is dry and lies above line 22 of FIG. 2 when the fabric is saturated with saline water.
Claim 24
Dependent Claim
27 words
A wound dressing as defined in claim 19 wherein the layer of predominantly alginate fiber web is more than about 10% by weight of the total fabric.
Claim 25
Dependent Claim
30 words
A wound dressing as defined in claim 19 wherein the layer of fiber web that is not predominantly alginate fiber is located between two layers of predominantly alginate fiber web.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |