US4994277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of xanthan gum for preventing adhesions
Assignee: Howmedica Osteonics Corp
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Filing: 1989-10-31
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Granted: 1991-02-19
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Expires: 2009-10-31
Abstract
Abstract A method for preventing adhesion utilizes a viscoelastic gel formed from xanthan gum. The gel is more viscous than blood and is soluble in aqueous solutions. The gel is placed between the tissues by a syringe. The method includes mixing the xanthan gum with either a saline solution or Tyrode's solution to form the gel.
Inventors
- 👤 Paul A. Higham
- 👤 Jessica D. Posey-Dowty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
C; C08; C08L; C08L5/00; A; A61; A61L; A61L31/00; A61L31/04; A61L31/042; A61L31/14; A61L31/16; A61B; A61B90/00; A61B90/08; A61B2090/0815; A61B2090/0816; A61L2300/00; A61L2300/40; A61L2300/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
A method of preventing adhesions between vital, tissues comprising the step of placing a viscoelastic gel comprising 1-3 weight percent biodegradable xanthan gum in an aqueous solution, between the tissues.
Claim 2
Independent Claim
30 words
A method of preventing adhesions between vital, tissues comprising the step of placing a viscoelastic gel comprising 1-3 weight percent biodegradable xanthan gum in an aqueous solution, between the tissues.
Claim 3
Dependent Claim
31 words
The method as set forth in claim 1 further comprising the step of mixing an anti-thrombogenic agent with the biodegradable xanthan gum solution prior to placing the material between the tissues.
Claim 4
Dependent Claim
32 words
The method as set forth in claim 1 wherein the viscoelastic gel comprises between 1 and 3 grams of xanthan gum dissolved in a 0.9% saline solution at a pH of 7.
Claim 5
Dependent Claim
28 words
The method as set forth in claim 1 wherein the viscoelastic gel comprises between 1 and 3 grams of xanthan gum mixed with 100 grams of Tyrode's solution.
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |