US5298015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing having a porous structure
Assignee: Zeon Corp
•
Filing: 1992-03-20
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Granted: 1994-03-29
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Expires: 2012-03-20
Abstract
Abstract A dressing for a wound having a porous structure of continuous pores throughout the dressing made of minute filaments arranged in three dimensions and filmy links (viewed at a magnification of about 35 to 350) connecting the filaments. The porous structure has pores defined by the filmy interconnections. In other words, the wound dressing has a continuous open-celled structure in an expanded foam. The wound dressing can advantageously be made of a highly biocompatible material, such as poly-α-amino acid.
Inventors
- 👤 Shigeru Komatsuzaki
- 👤 Toshinobu Hirayama
- 👤 Tetsuo Toyokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:10
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/00051; A61F13/00063; A61F13/00987; A61F13/00991; A61F13/00995; A61F13/01; A61F13/01021; A61F13/15; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00157; A61F2013/00217; A61F2013/00221; A61F2013/00225; A61F2013/00234; A61F2013/00246; A61F2013/00255; A61F2013/00361; A61F2013/00365; A61F2013/00463; A61F2013/00472; A61F2013/00519; A61F2013/00544; A61F2013/00604; A61F2013/00608; A61F2013/00612; A61F2013/00855; A61F2013/00863; A61F2013/00902; A61F2013/00906; A61F2013/0091; A61F2013/00927; A61F13/53; A61F2013/530802; A61F2013/53081; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/926; Y10S602/00; Y10S602/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A dressing for a wound comprising a porous structure of continuous pores throughout the dressing made of minute filaments arranged in three dimensions, and filmy links, viewed at a magnification of about 35 to 350, connecting the filaments, the porous structure having pores defined by the filmy interconnections.
Claim 2
Dependent Claim
48 words
A dressing for a wound comprising a porous structure of continuous pores throughout the dressing made of minute filaments arranged in three dimensions, and filmy links, viewed at a magnification of about 35 to 350, connecting the filaments, the porous structure having pores defined by the filmy interconnections.
Claim 3
Dependent Claim
67 words
A dressing for a wound as defined in claim 1, wherein the pores are continuous in the porous structure and connected to other pores by the filmy links; the dressing further comprising a wound-facing surface, an opposing surface and a volume disposed therebetween; the pores of the wound-facing surface and of the volume, respectively, being greater in number and larger than the pores of the opposing surface.
Claim 4
Dependent Claim
19 words
A dressing for a wound as defined in claim 1, wherein the porous structure is made of poly-α-amino acid.
Claim 5
Dependent Claim
15 words
A dressing for a wound as defined in claim 1, further comprising an antimicrobial agent.
Claim 6
Dependent Claim
45 words
A dressing for a wound as defined in claim 2, wherein the pores for the wound-facing surface and of the volume have a diameter of about 20 to 500 μm, and the pores of the opposing surface have a diameter up to about 20 μm.
Claim 7
Dependent Claim
35 words
A dressing for a wound as defined in claim 5, wherein the dressing has a thickness of about 0.1 to 10 mm and the opposing surface has a thickness of about 0.5 to 5 μm.
Claim 8
Dependent Claim
22 words
A dressing for a wound as defined in claim 1, further comprising a mesh of reinforcing material embedded in the porous structure.
Claim 9
Dependent Claim
35 words
A dressing for a wound as defined in claim 7, wherein the reinforcing material forms a border to the dressing, the pores on the wound-facing surface are smaller than the pores of the opposing surface.
Claim 10
Dependent Claim
27 words
A dressing for a wound as defined in claim 1, further comprising a plurality of perforations in the dressing between the wound-facing surface and the opposing surface.
Claim 11
Dependent Claim
59 words
A dressing for a wound comprising a porous structure of continuous pores throughout the dressing made of minute filaments arranged in three dimensions, and filmy links, viewed at a magnification of about 35 to 350, connecting the filaments, the porous structure having pores defined by the filmy interconnections and a mesh of reinforcing material embedded in the porous structure.
Claim 12
Dependent Claim
59 words
A dressing for a wound comprising a porous structure of continuous pores throughout the dressing made of minute filaments arranged in three dimensions, and filmy links, viewed at a magnification of about 35 to 350, connecting the filaments, the porous structure having pores defined by the filmy interconnections and a mesh of reinforcing material embedded in the porous structure.
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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) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |