Patent US4928917A successfully refreshed from Google Patents.
EP0754467A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A novel surgical material
Assignee: Astra Tech AB
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Filing: 1989-06-19
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Granted: —
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Expires: 2009-06-19
Abstract
Abstract Polyhydroxybutyric acid polymers or copolymers of hydroxybutyric acid and hydroxyvaleric acid may be used for preparing a porous, bioresorbable flexible sheet for tissue separation and stimulation of tissue regeneration at healing processes in injured soft tissue in mammals including man. The sheet has a pore size permitting passage of water and salts through the sheet but which locks out cells and other tissue particles. Processes for preparation of the material and are also described.
Inventors
- 👤 Staffan Bowald
- 👤 Gunilla Johansson-Ruden
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:16
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L31/00; A61L31/14; A61L31/148; A61F; A61F2/00; A61F2/0063; A61L27/00; A61L27/14; A61L27/18; A61L27/40; A61L27/44; A61L27/48; A61L27/50; A61L27/56; A61L27/58; A61L31/04; A61L31/06; A61L31/12; A61L31/125; A61L31/129; A61L31/146; A61F2210/00; A61F2210/0004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
Use of polyhydroxybutyric acid polymers or copolymers of hydroxybutyric acid and hydroxyvaleric acid for preparing a porous, bioresorbable flexible sheet for tissue separation and stimulation of tissue regeneration at healing processes in injured soft tissue in mammals including man, said sheet having a pore size permitting passage of water and salts through the sheet but which locks out cells and other tissue particles.
Claim 2
Dependent Claim
19 words
Use in accordance with claim 1, in which the pore size is up to 30 µm, preferentially 0.1―10 µm.
Claim 3
Dependent Claim
21 words
Use in accordance with claim 1 or 2, in which the thickness of the sheet is about 10 µm― 1 mm.
Claim 4
Dependent Claim
17 words
Use accordance with any one of the preceding claims, said sheet being combined with a resorbable reinforcement.
Claim 5
Dependent Claim
23 words
Use accordance with any one of the preceding claims, provided that said sheet is not adapted to replace a part of the pericardium.
Claim 6
Dependent Claim
62 words
A porous, bioresorbable flexible sheet for tissue separation and stimulation of tissue regeneration at healing processes in injured soft tissue in mammals including man, said sheet being made of polyhydroxybutyric acid polymers or copolymers of hydroxybutyric acid and hydroxyvaleric acid and having a pore size permitting passage of water and salts through the sheet but which locks out cells and other tissue.
Claim 7
Dependent Claim
20 words
A sheet in accordance with claim 6, in which the pore size is up to 30 µm, preferentially 0.1―10 µm.
Claim 8
Dependent Claim
21 words
A sheet in accordance with claim 6 or 7, in which the thickness of the sheet is about 10 µm―1 mm.
Claim 9
Dependent Claim
20 words
A sheet in accordance with any one of claims 6 to 8, said sheet being combined with a resorbable reinforcement.
Claim 10
Dependent Claim
26 words
A sheet in accordance with any one of claims 6 to 9, provided that said sheet is not adapted to replace a part of the pericardium.
References Cited (Backward Citations)
FR2060524A5
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US4355426A
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US4603695A
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JPS60137402A
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JPS618107A
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US4603070A
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WO1986002843A1
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EP0204931A1
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WO1986007250A1
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EP0258781A1
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