Patent US6221109B1 successfully refreshed from Google Patents.
US6221109B1
Expired / Lapsed
US
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Method of protecting spinal area
Assignee: Ed Geistlich Soehne AG fuer Chemische Industrie
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Filing: 1999-09-15
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Granted: 2001-04-24
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Expires: 2019-09-15
Abstract
Abstract A method of protecting a spinal area of a patient includes the step of positioning a sheet of collagen membrane material so as to surround at least a portion of a patient's spinal chord. The sheet of collagen membrane preferably includes at least one barrier layer with a smooth face to inhibit cell adhesion and act as a barrier to prevent passage of cells therethrough. When surgery involves placement of s vertebrae replacement material between vertebrae, the collagen membrane material can be positioned so as to surround at least a portion of the vertebrae replacement material.
Inventors
- 👤 Peter Geistlich
- 👤 Philip J. Boyne
- 👤 Lothar Schlösser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:47
CPC Classifications
A; A61; A61L; A61L31/00; A61L31/04; A61L31/043; A61L31/044; A61L2430/00; A61L2430/38
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
A method of protecting a spinal area of a patient comprising positioning a sheet of resorbable collagen membrane material so as to substantially wrap the collagen membrane material around a patient's spinal chord wherein said collagen membrane material is comprised of at least one barrier layer having at least one smooth face so as to inhibit cell adhesion thereon and act as a barrier to prevent passage of cells therethrough.
Claim 2
Independent Claim
70 words
A method of protecting a spinal area of a patient comprising positioning a sheet of resorbable collagen membrane material so as to substantially wrap the collagen membrane material around a patient's spinal chord wherein said collagen membrane material is comprised of at least one barrier layer having at least one smooth face so as to inhibit cell adhesion thereon and act as a barrier to prevent passage of cells therethrough.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said barrier layer further has a fibrous face opposite said smooth face, said fibrous face allowing cell growth thereon.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein said barrier layer is predominantly collagen I, collagen III or a mixture thereof.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein said collagen membrane further comprises a matrix layer predominantly of collagen II having an open sponge-like texture.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein said barrier layer, said matrix layer or both, are impregnated with glycosaminoglycan.
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein the glycosaminoglycan is hyaluronic acid, chondroitin 6-sulphate, keratin sulphate or dermatan sulphate.
Claim 8
Dependent Claim
25 words
The method of claim 2 wherein said membrane material further comprises a second barrier layer, and a resorbable polymer layer sandwiched between the barrier layers.
Claim 9
Dependent Claim
13 words
The method of claim 7 wherein said polymer is a polylactic acid polymer.
Claim 10
Dependent Claim
25 words
The method of claim 1 wherein said sheet is positioned adjacent a dura sheath of said spinal chord, so as to protect said dura sheath.
Claim 11
Independent Claim
90 words
A method of protecting a spinal area of a patient comprising positioning a sheet of resorbable collagen membrane material so as to substantially wrap the collagen membrane material around a patient's spinal chord, wherein said sheet is positioned adjacent a dura sheath of said spinal chord, so as to protect said dura sheath, further comprising the step of inserting a vertebrae implant material outside said sheet adjacent said dura sheath, and further positioning a second sheet of collagen membrane material around at least a portion of said vertebrae implant material.
Claim 12
Independent Claim
90 words
A method of protecting a spinal area of a patient comprising positioning a sheet of resorbable collagen membrane material so as to substantially wrap the collagen membrane material around a patient's spinal chord, wherein said sheet is positioned adjacent a dura sheath of said spinal chord, so as to protect said dura sheath, further comprising the step of inserting a vertebrae implant material outside said sheet adjacent said dura sheath, and further positioning a second sheet of collagen membrane material around at least a portion of said vertebrae implant material.
Claim 13
Dependent Claim
26 words
The method of claim 10 wherein said second sheet of collagen membrane material also surrounds at least a portion of a vertebrae surrounding said spinal chord.
Claim 14
Independent Claim
58 words
A method of protecting a spinal area of a patient in which a vertebrae implant material has been positioned adjacent to the patient's spinal chord in an intervertebral space between two vertebrae, comprising positioning a sheet of resorbable collagen material adjacent the intervertebral space so as to substantially wrap the collagen membrane material around the vertebrae implant material.
Claim 15
Independent Claim
58 words
A method of protecting a spinal area of a patient in which a vertebrae implant material has been positioned adjacent to the patient's spinal chord in an intervertebral space between two vertebrae, comprising positioning a sheet of resorbable collagen material adjacent the intervertebral space so as to substantially wrap the collagen membrane material around the vertebrae implant material.
Claim 16
Dependent Claim
34 words
The method of claim 12 wherein said sheet of collagen membrane material includes at least one barrier layer having a smooth face that protects against ingrowth of connective tissue into said vertebrae implant material.
Claim 17
Dependent Claim
28 words
The method of claim 12 wherein said sheet of collagen membrane material is positioned to also surround at least a portion of a vertebrae surrounding said spinal chord.
Claim 18
Dependent Claim
25 words
The method of claim 1 wherein said sheet is positioned so as to surround at least a portion of a vertebrae surrounding said spinal chord.
Claim 19
Dependent Claim
26 words
The method of claim 1 wherein said sheet is positioned so as to surround at least a portion of a spinal disc surrounding said spinal chord.
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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) | 2004-04-23 | 2004-10-23 | 2005-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-04-23 | 2008-10-23 | 2009-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-04-23 | 2012-10-23 | 2013-04-24 | $7700.00 | Window Closed / Lapsed |