US5968096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of repairing perforated submucosal tissue graft constructs
Assignee: Indiana University Health Inc
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Filing: 1997-08-06
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Granted: 1999-10-19
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Expires: 2017-08-06
Abstract
Abstract A perforated unitary multi-laminar tissue graft construct and method for preparing such construct is described. The method comprises overlapping strips of submucosa tissue with other strips of submucosal tissue, compressing at least the overlapped portions of said strips between two surfaces under conditions that allow or promote dehydration of the compressed submucosa sheets, and perforating the resulting unitary tissue graft construct. The perforated tissue graft compositions have enhanced mechanical and remodeling properties relative to non-perforated submucosal tissue grafts.
Inventors
- 👤 Bryan Whitson
- 👤 Boyle Cheng
- 👤 Stephen F. Badylak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:46
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/36; A61L27/3683; A61F; A61F2/00; A61F2/02; A61L27/3604; A61L27/3629; A61F2240/00; A61F2240/001
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
114 words
In a method of preparing an improved unitary multilaminate tissue graft construct, said method comprising overlapping at least a portion of a strip of intestinal submucosa tissue with another strip of submucosa tissue, wherein the strips of submucosa tissue are delaminated from both the tunica muscularis and the luminal portion of the tunica mucosa of a warm blooded vertebrate; and comprising at least the overlapped portions of the strips of submucosa tissue under conditions allowing at least partial dehydration of the compressed submucosa tissue; the improvement comprising the step of perforating the overlapped portions of submucosa tissue to form perforations to decrease fluid retention in the graft and enhance the adhesion of adjacent layers.
Claim 2
Dependent Claim
114 words
In a method of preparing an improved unitary multilaminate tissue graft construct, said method comprising overlapping at least a portion of a strip of intestinal submucosa tissue with another strip of submucosa tissue, wherein the strips of submucosa tissue are delaminated from both the tunica muscularis and the luminal portion of the tunica mucosa of a warm blooded vertebrate; and comprising at least the overlapped portions of the strips of submucosa tissue under conditions allowing at least partial dehydration of the compressed submucosa tissue; the improvement comprising the step of perforating the overlapped portions of submucosa tissue to form perforations to decrease fluid retention in the graft and enhance the adhesion of adjacent layers.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein the perforations are uniformly distributed on the surfaces of the graft construct.
Claim 4
Dependent Claim
21 words
The method of claim 1, wherein the perforations in the submucosa tissue are prepared by pressing pins into the submucosa tissue.
Claim 5
Dependent Claim
30 words
The method of claim 3, wherein the pins are pressed into the submucosa tissue at an angle other than 90° to the plane of the surface of the graft construct.
Claim 6
Dependent Claim
28 words
The method of claim 1, wherein the submucosa tissue has been dried to a water content of about 10%-20% by weight at the time the tissue is perforated.
Claim 7
Dependent Claim
25 words
The method of claim 1, wherein the strips of submucosa tissue forming said graft construct are orientated so that the graft construct has pseudoisotropic properties.
Claim 8
Dependent Claim
21 words
The method of claim 1, wherein the strips of submucosa are conditioned to have a strain of no more than 20%.
Claim 9
Dependent Claim
24 words
The method of claim 3, wherein the pins are pressed into the graft construct from two opposite sides of the multi-laminate tissue graft construct.
Claim 10
Dependent Claim
153 words
In a method of preparing an improved unitary multi-laminate tissue graft construct, said method comprising overlapping a portion of a strip of intestinal submucosa tissue with another strip of submucosa tissue, wherein each strip of submucosa tissue has first and second planar surfaces and each strip of submucosa tissue is delaminated from both the tunica muscularis and at least the luminal portion of the tunica mucosa of a warm blooded vertebrate, to form a graft construct having a planar surface with a surface area greater than the surface area of any one planar surface of the individual strips of submucosa tissue used to form said construct; and compressing the overlapped portions of the strips of submucosa tissue under conditions allowing at least partial dehydration of the compressed submucosa tissue to form perforations; the improvement comprising perforating the submucosa tissue to decrease fluid retention in the graft and enhance the adhesion of adjacent layers.
Claim 11
Dependent Claim
153 words
In a method of preparing an improved unitary multi-laminate tissue graft construct, said method comprising overlapping a portion of a strip of intestinal submucosa tissue with another strip of submucosa tissue, wherein each strip of submucosa tissue has first and second planar surfaces and each strip of submucosa tissue is delaminated from both the tunica muscularis and at least the luminal portion of the tunica mucosa of a warm blooded vertebrate, to form a graft construct having a planar surface with a surface area greater than the surface area of any one planar surface of the individual strips of submucosa tissue used to form said construct; and compressing the overlapped portions of the strips of submucosa tissue under conditions allowing at least partial dehydration of the compressed submucosa tissue to form perforations; the improvement comprising perforating the submucosa tissue to decrease fluid retention in the graft and enhance the adhesion of adjacent layers.
Claim 12
Dependent Claim
29 words
The method of claim 9, wherein the submucosa tissue has been dried to a water content of about 10%-20% by weight at the time the graft construct is perforated.
Claim 13
Dependent Claim
27 words
The method of claim 9, wherein the perforations are formed by pressing pins into the graft construct from two opposite sides of the multi-laminate tissue graft construct.
Claim 14
Dependent Claim
25 words
The method of claim 9, wherein the strips of submucosa tissue forming said graft construct are orientated so that the graft construct has pseudoisotropic properties.
Claim 15
Dependent Claim
125 words
In a method of preparing an improved unitary multi-laminate tissue graft construct, said method comprising overlapping at least a portion of a strip of intestinal submucosa tissue with another strip of submucosa tissue, wherein the strips of submucosa tissue are delaminated from both the tunica muscularis and at least the luminal portion of the tunica mucosa of a warm blooded vertebrate; and compressing at least the overlapped portions of the strips of submucosa tissue under conditions allowing at least partial dehydration of the compressed submucosa tissue; the improvement comprising perforating the overlapped portions of submucosa tissue wherein the perforated portion of the graft has at least 2 perforations per cm 2 to decrease fluid retention in the graft and enhance the adhesion of adjacent layers.
Claim 16
Dependent Claim
125 words
In a method of preparing an improved unitary multi-laminate tissue graft construct, said method comprising overlapping at least a portion of a strip of intestinal submucosa tissue with another strip of submucosa tissue, wherein the strips of submucosa tissue are delaminated from both the tunica muscularis and at least the luminal portion of the tunica mucosa of a warm blooded vertebrate; and compressing at least the overlapped portions of the strips of submucosa tissue under conditions allowing at least partial dehydration of the compressed submucosa tissue; the improvement comprising perforating the overlapped portions of submucosa tissue wherein the perforated portion of the graft has at least 2 perforations per cm 2 to decrease fluid retention in the graft and enhance the adhesion of adjacent layers.
Claim 17
Dependent Claim
29 words
The method of claim 13, wherein the submucosa tissue has been dried to a water content of about 10%-20% by weight at the time the graft construct is perforated.
Claim 18
Dependent Claim
27 words
The method of claim 13, wherein the perforations are formed by pressing pins into the graft construct from two opposite sides of the multi-laminate tissue graft construct.
Claim 19
Dependent Claim
25 words
The method of claim 13, wherein the strips of submucosa tissue forming said graft construct are orientated so that the graft construct has pseudoisotropic properties.
Claim 20
Dependent Claim
33 words
The method of claim 13, wherein the perforations are formed by pressing pins into the graft construct at an angle other than 90° to the plane of a surface of the graft construct.
Claim 21
Dependent Claim
15 words
The method of claim 13, wherein the perforations are uniformly distributed on the graft construct.
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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) | 2002-10-18 | 2003-04-19 | 2003-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-18 | 2007-04-19 | 2007-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-18 | 2011-04-19 | 2011-10-19 | $7700.00 | Window Closed / Lapsed |