US5197882A — Periodontal barrier and method for aiding periodo…

Claim 1

Independent Claim 157 words

A method for aiding and guiding periodontal tissue regeneration, comprising the steps of: incorporating time-release microshapes encapsulating at least one chemotherapeutic agent into a biocompatible periodontal barrier so as to provide for sustained, controlled delivery of said at least one chemotherapeutic agent to a localized periodontal regeneration site in a mammalian body, said incorporating step is selected from the group consisting of extruding said microshapes into a microstructure of said barrier, weaving said microshapes into the microstructure of said barrier, mixing said microshapes with a fluid or gel and flowing them into the microstructure of said barrier, placing said microshapes between one or more layers of said barrier and positioning said microshapes between said barrier and an elastomer coating covering said barrier; and implanting said barrier at said localized periodontal regeneration site, wherein said time-release microshapes will begin to release said at least one chemotherapeutic agent at said localized periodontal regeneration site in a sustained controlled manner.

Claim 2

Independent Claim 157 words

A method for aiding and guiding periodontal tissue regeneration, comprising the steps of: incorporating time-release microshapes encapsulating at least one chemotherapeutic agent into a biocompatible periodontal barrier so as to provide for sustained, controlled delivery of said at least one chemotherapeutic agent to a localized periodontal regeneration site in a mammalian body, said incorporating step is selected from the group consisting of extruding said microshapes into a microstructure of said barrier, weaving said microshapes into the microstructure of said barrier, mixing said microshapes with a fluid or gel and flowing them into the microstructure of said barrier, placing said microshapes between one or more layers of said barrier and positioning said microshapes between said barrier and an elastomer coating covering said barrier; and implanting said barrier at said localized periodontal regeneration site, wherein said time-release microshapes will begin to release said at least one chemotherapeutic agent at said localized periodontal regeneration site in a sustained controlled manner.

Claim 3

Dependent Claim 17 words

The method of claim 1 wherein the incorporating step includes selecting a biocompatible barrier which is nonresorbable.

Claim 4

Dependent Claim 30 words

The method of claim 2 wherein said incorporating step includes selecting a biocompatible, nonresorbable barrier composed of a material selected from the group consisting of polytetrafluoroethylene, dacron, proplast and polypropylene.

Claim 5

Dependent Claim 17 words

The method of claim 1 wherein the incorporating step includes selecting a biocompatible barrier which is resorbable.

Claim 6

Dependent Claim 19 words

The method of claim 4 wherein the incorporating step includes selecting a bicompatible, resorbable barrier composed of cross-linked collagen.

Claim 7

Dependent Claim 25 words

The method of claim 1 wherein the incorporating step includes selecting microshapes selected from the group consisting of microspheres, microfibrils, microfibers, hollow microfibers and microsponges.

Claim 8

Dependent Claim 34 words

The method of claim 6 wherein the incorporating step includes selecting microspheres sized between approximately 10 to 700 microns in diameter or hollow microfibers having a cross-sectional diameter between approximately 100 to 1000 microns.

Claim 9

Dependent Claim 37 words

The method of claim 1 wherein the incorporating step includes selecting time-release microshapes encapsulating step chemotherapeutic agents which have time release values, thereby assuring generally continuous release of said chemotherapeutic agents over a predetermined period of time.

Claim 10

Dependent Claim 21 words

The method of claim 8 wherein the incorporating step includes mixing said chemotherapeutic agent with a polymer comprising said time-release microshape.

Claim 11

Dependent Claim 15 words

The method of claim 9 wherein the mixing step includes selecting a bicompatible, non-resorbable polymer.

Claim 12

Dependent Claim 15 words

The method of claim 9 wherein the mixing step includes selecting a biodegradable, resorbable polymer.

Claim 13

Dependent Claim 39 words

The method of claim 10 or 11 wherein the mixing step includes selecting the polymer from the group consisting of collagen, cellulosic polymers, ethylene vinyl acetate, methacrylate polymers, lactic glycolic acid polymers, polycaprolactone, polylactides, polystyrene, polycarbonate, polysulfone and polyurethane.

Claim 14

Dependent Claim 43 words

The method of claim 1 wherein the incorporating step includes selecting microshapes for incorporation into said barriers which are surrounded by a polymeric wall or shell, thereby providing for continuous or periodic release of said chemotherapeutic agents over a predetermined period of time.

Claim 15

Independent Claim 25 words

The method of claim wherein the incorporating step includes selecting the chemotherapeutic agent from the group consisting of antibacterial, antibiotic, anti-inflammatory and tissue regenerative agents.

Claim 16

Dependent Claim 27 words

The method of claim 14 wherein the incorporating step includes selecting the antibacterial agent from the group consisting of bisbiguanides, fluorides, iodine, heavy metal salts and sulfonamides.

Claim 17

Dependent Claim 28 words

The method of claim 14 wherein the incorporating step includes selecting the antibiotic agent from the group consisting of vancomycin, tetracycline, penicillin, cephalosporins, erythromycin, metronidazole, neomycin and kanamycin.

Claim 18

Dependent Claim 26 words

The method of claim 14 wherein the incorporating step includes selecting the anti-inflammatory agent from the group consisting of steroidal anti-inflammatory agents and non-steroidal anti-inflammatory agents.

Claim 19

Dependent Claim 26 words

The method of claim 17 wherein the incorporating step includes selecting the steroidal anti-inflammatory agent from the group consisting of cortisone, hydrocortisone, beta-methasone, dexamethasone and prednisolone.

Claim 20

Dependent Claim 28 words

The method of claim 17 wherein the incorporating step includes selecting the a non-steroidal anti-inflammatory agent from the group consisting of indomethacin, flurbiprofen, meclofenamic acid, ibuprofen and naproxen.

Claim 21

Dependent Claim 25 words

The method of claim 14 wherein the incorporating step includes selecting the tissue regenerative agent from the group consisting of fibronectin and bone morphogenic protein.

Claim 22

Dependent Claim 134 words

A periodontal barrier comprising: a porous matrix made of a body compatible material and configured for aiding and guiding periodontal tissue growth adjacent a tooth; and time-release microparticles encapsulating at least one chemotherapeutic agent being incorporated into said porous material by a process selected from the group consisting of extruding said microshapes into the microstructure of said barrier, weaving said microshapes into the microstructure of said barrier, mixing said microshapes with a fluid or gel and flowing them into the microstructure of said barrier, placing said microshapes between one or more layers of said barrier and positioning said microshapes between said barrier and an elastomer coating covering said barrier, wherein said time-release microparticles will begin to release said chemotherapeutic agent at a localized periodontal tissue regeneration site upon surgical implantation of said periodontal barrier.

Claim 23

Dependent Claim 134 words

A periodontal barrier comprising: a porous matrix made of a body compatible material and configured for aiding and guiding periodontal tissue growth adjacent a tooth; and time-release microparticles encapsulating at least one chemotherapeutic agent being incorporated into said porous material by a process selected from the group consisting of extruding said microshapes into the microstructure of said barrier, weaving said microshapes into the microstructure of said barrier, mixing said microshapes with a fluid or gel and flowing them into the microstructure of said barrier, placing said microshapes between one or more layers of said barrier and positioning said microshapes between said barrier and an elastomer coating covering said barrier, wherein said time-release microparticles will begin to release said chemotherapeutic agent at a localized periodontal tissue regeneration site upon surgical implantation of said periodontal barrier.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-03-29	1996-09-28	1997-03-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-03-29	2000-09-28	2001-03-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-03-29	2004-09-28	2005-03-30	$7700.00	Window Closed / Lapsed

Periodontal barrier and method for aiding periodontal tissue regeneration agents

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