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US4505266A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of using a fibrous lattice

Assignee: Massachusetts Institute of Technology
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Filing: 1984-04-17
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Granted: 1985-03-19
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Expires: 2004-04-17
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Abstract

Abstract This invention relates to the introduction of viable cells into a fibrous lattice by surgical, force-utilizing, or other manipulative techniques, all of which are referred to herein as "seeding." One embodiment comprises an autografting technique which involves intact tissue. Other embodiments which involve the distribution of an aqueous suspension of cells comprise centrifugal, spraying, pipetting and syringe emplacement. Each cell that survives the seeding process may reproduce into a colony of cells which grow until they reach confluence, thereby creating a uniform layer or volume of tissue. By proper placement of cells capable of generating such colonies, the period of recovery of a wound may be drastically reduced. In addition, research by the Applicants indicates that tissue that is regenerated using the methods of this invention to seed a lattice comprising collagen and glycosaminoglycan tends to be smoother, more uniform, less fibrotic, less scarred and more flexible than tissue that is regenerated by wound contraction or conventional autografting.

Inventors

  • 👤 Ioannis V. Yannas
  • 👤 John F. Burke

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 08:02
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/22; A61L27/24; A61L27/50; A61L27/60; A61F; A61F2310/00; A61F2310/00005; A61F2310/00365; Y; Y10; Y10S; Y10S623/00; Y10S623/915

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 73 words
In the method of using a fibrous lattice which: a. has controllable biodegradability in the presence of body enzymes; b. provokes no substantial immune respone or inflammation when grafted or implanted into a wound; c. has sufficiently high porosity, pore size and permeability to allow cell migration and reproduction; and d. has sufficiently high strength to resist tearing and collapse if grafted onto a wound, the improvement comprising seeding cells into said lattice.
Claim 2
Dependent Claim 73 words
In the method of using a fibrous lattice which: a. has controllable biodegradability in the presence of body enzymes; b. provokes no substantial immune respone or inflammation when grafted or implanted into a wound; c. has sufficiently high porosity, pore size and permeability to allow cell migration and reproduction; and d. has sufficiently high strength to resist tearing and collapse if grafted onto a wound, the improvement comprising seeding cells into said lattice.
Claim 3
Dependent Claim 37 words
In the method of using a fibrous lattice which has morphological characteristics that substantially resemble the morphological characteristics of the intercellular proteinous matrix that normally exists within healthy tissue, the improvement comprising seeding cells into said lattice.
Claim 4
Dependent Claim 37 words
In the method of using a fibrous lattice which has morphological characteristics that substantially resemble the morphological characteristics of the intercellular proteinous matrix that normally exists within healthy tissue, the improvement comprising seeding cells into said lattice.
Claim 5
Independent Claim 21 words
A method of claims 1 or 2 wherein said lattice comprises collagen molecules that are crosslinked and covalently bonded to glycosaminoglycan.
Claim 6
Independent Claim 31 words
A method of claims 1 or 2 wherein, prior to seeding cells into said lattice, said cells are contacted with a substance that increases the rate of reproduction of said cells.
Claim 7
Dependent Claim 28 words
A method of claim 3 wherein said glycosaminoglycan is selected from the following group: chondroitin 6-sulfate, chondroitin 4-sulfate, heparin, heparan sulfate, keratan sulfate, dermatan sulfate, chitin, and chitosan.

References Cited (Backward Citations)

US3955012A Cited
US3800792A Cited
US3826678A Cited
US4352883A Cited
US4304866A Cited
US4326532A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-03-18 1988-09-17 1989-03-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-03-18 1992-09-17 1993-03-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-03-18 1996-09-17 1997-03-19 $7700.00 Window Closed / Lapsed

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