US3853462A — Compaction of polyester fabric materials

Claim 1

Independent Claim 213 words

A PROCESS FOR PREPARING A SYNTHETIC VASCULAR PROSTHESIS COMPRISING THE STEPS OF: A. PROVIDING A KNITTED SYNTHETIC LINEAR POLYESTER FABRIC TUBING MATERIAL HAVING A UNIFORM POROSITY, MEASURED ON THE WESOLOWSKI SCALE, ABOVE ABOUT 7,500 UP TO ABOUT 20,000 AND IN EXCESS OF THAT SUITABLE FOR LONG-TERM HEALING EFFECTS WITHOUT UNDUE HEMORRHAGING AT IMPLANTATION: B. IMMERSING SAID POROUS KNITTED SYNTHETIC LINEAR POLYESTER FABRIC TUBING MATERIAL IN A COMPACTING SOLUTION CONSISTING ESSENTIALLY OF FROM ABOUT 2 TO ABOUT 10 PERCENT BY WEIGHT OF AN ACIDIC ORGANIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF HEXAFLUOROISOPROPANOL, PHENOL, META-CRESOL, HEXAFLUOROACETONE PROPYLENE ADDUCT, TRICHLOROACETIC ACID, PARACHLOROPHENOL AND HEXAFLUOROACETONE SESQUIHYDRATE AND ABOUT 98 TO ABOUT 90 PERCENT BY WEIGHT OF A HALOGENATED ALIPHATIC HYDROCARBON SELECTED FROM THE GROUP CINSISTING OF METHYLENE CHLORIDE, CHLOROFORM, TETRACHLOROETHANE AND ETHYLENE DICHLORIDE UNITL SAID FABRIC MATERIAL UNIFORMLY SHINKS AT LEAST ABOUT 30 PERCENT MEASURED IN THE WALE DIRECTION AND THE POROSITY OF THE SAID FABRIC MATERIAL IS, MEASURED ON THE WESOLOWSHI SCALE, FROM ABOUT 30 TO ABOUT 5,000 AND SUITABLE FOR LONG-TERM HEALING EFFECTS WITHOUT UNDUE HEMORRHAGING AT IMPLANTATION; C. REMOVING SAID COMPACTED FABRIC MATERIAL FROM SAID COM: PACTING SOLUTION; D. WASHING SAID COMPACTED FABRIC MATERIAL TO REMOVE ALL TRACES OF SAID COMPACTING SOLUTION; AND E. FORMING SAID COMPACTED FABRIC MATERIAL INTO A VASCULAR PORSTHESIS.

Claim 2

Dependent Claim 213 words

A PROCESS FOR PREPARING A SYNTHETIC VASCULAR PROSTHESIS COMPRISING THE STEPS OF: A. PROVIDING A KNITTED SYNTHETIC LINEAR POLYESTER FABRIC TUBING MATERIAL HAVING A UNIFORM POROSITY, MEASURED ON THE WESOLOWSKI SCALE, ABOVE ABOUT 7,500 UP TO ABOUT 20,000 AND IN EXCESS OF THAT SUITABLE FOR LONG-TERM HEALING EFFECTS WITHOUT UNDUE HEMORRHAGING AT IMPLANTATION: B. IMMERSING SAID POROUS KNITTED SYNTHETIC LINEAR POLYESTER FABRIC TUBING MATERIAL IN A COMPACTING SOLUTION CONSISTING ESSENTIALLY OF FROM ABOUT 2 TO ABOUT 10 PERCENT BY WEIGHT OF AN ACIDIC ORGANIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF HEXAFLUOROISOPROPANOL, PHENOL, META-CRESOL, HEXAFLUOROACETONE PROPYLENE ADDUCT, TRICHLOROACETIC ACID, PARACHLOROPHENOL AND HEXAFLUOROACETONE SESQUIHYDRATE AND ABOUT 98 TO ABOUT 90 PERCENT BY WEIGHT OF A HALOGENATED ALIPHATIC HYDROCARBON SELECTED FROM THE GROUP CINSISTING OF METHYLENE CHLORIDE, CHLOROFORM, TETRACHLOROETHANE AND ETHYLENE DICHLORIDE UNITL SAID FABRIC MATERIAL UNIFORMLY SHINKS AT LEAST ABOUT 30 PERCENT MEASURED IN THE WALE DIRECTION AND THE POROSITY OF THE SAID FABRIC MATERIAL IS, MEASURED ON THE WESOLOWSHI SCALE, FROM ABOUT 30 TO ABOUT 5,000 AND SUITABLE FOR LONG-TERM HEALING EFFECTS WITHOUT UNDUE HEMORRHAGING AT IMPLANTATION; C. REMOVING SAID COMPACTED FABRIC MATERIAL FROM SAID COM: PACTING SOLUTION; D. WASHING SAID COMPACTED FABRIC MATERIAL TO REMOVE ALL TRACES OF SAID COMPACTING SOLUTION; AND E. FORMING SAID COMPACTED FABRIC MATERIAL INTO A VASCULAR PORSTHESIS.

Claim 3

Dependent Claim 21 words

The method of claim 1 wherein said acidic organic component is hexafluoroisopropanol and the said halogenated aliphatic hydrocarbon is methylene chloride.

Claim 4

Dependent Claim 33 words

The process of claim 2 wherein said compacting solution contains from about 4 to about 8 percent by weight of hexafluoroisopropanol and about 96 to about 92 percent by weight of methylene chloride.

Claim 5

Dependent Claim 11 words

The method of claim 1 wherein said polyester is polyethylene terephthalate.

Claim 6

Dependent Claim 21 words

The method of claim 1 wherein said compacting includes a shrinkage of at least about 40 percent in the wale direction.

Claim 7

Dependent Claim 17 words

The process of claim 1 wherein said forming of the prosthesis includes crimping of the compacted tubing.

Claim 8

Dependent Claim 27 words

The process of claim 1 wherein said fabric material is immersed in the said compacting solution for a time of from about 15 seconds to 30 minutes.

Claim 9

Dependent Claim 151 words

A process for preparing a synthetic vascular prosthesis which comprises the steps of: a. providing a uniformly porous, knitted polyethylene terephthalate tubing having a wall thickness between about 0.1 and 0.3 mm. and a porosity, measured on the Wesolowski scale, above about 7,500 up to about 20,000; b. immersing said porous, knitted polyethylene terephthalate tubing in a compacting solution consisting essentially of from about 4 to about 8 percent by weight hexafluoroisopropanol and from about 96 to about 92 percent by weight of methylene chloride for from about 5 to about 15 minutes to uniformly compact the tubing, said compacted tubing having a porosity, measured on the Wesolowski scale, of from about 30 to about 5, 000; c. removing said compacted tubing from the compacting solution; d. washing and drying said compacted tubing to remove all traces of the compacting solution and wash liquid; and e. crimping said dried compacted tubing.

Claim 10

Dependent Claim 151 words

A process for preparing a synthetic vascular prosthesis which comprises the steps of: a. providing a uniformly porous, knitted polyethylene terephthalate tubing having a wall thickness between about 0.1 and 0.3 mm. and a porosity, measured on the Wesolowski scale, above about 7,500 up to about 20,000; b. immersing said porous, knitted polyethylene terephthalate tubing in a compacting solution consisting essentially of from about 4 to about 8 percent by weight hexafluoroisopropanol and from about 96 to about 92 percent by weight of methylene chloride for from about 5 to about 15 minutes to uniformly compact the tubing, said compacted tubing having a porosity, measured on the Wesolowski scale, of from about 30 to about 5, 000; c. removing said compacted tubing from the compacting solution; d. washing and drying said compacted tubing to remove all traces of the compacting solution and wash liquid; and e. crimping said dried compacted tubing.

Claim 11

Dependent Claim 192 words

A process for reducing the porosity of a uniformly porous knitted synthetic linear polyester fabric material which comprises contacting said fabric with a compacting solution containing a minor proportion of a solvent for the polyester and a major proportion of a shrinking agent for the polyester for a time sufficient to uniformly compact said fabric at least about 30 percent measured in the wale direction of the fabric, said solvent being selected from the group consisting of hexafluoroisopropanol, phenol, meta-cresol, hexafluoroacetone propylene adduct, trichloroacetic acid, parachlorophenol and hexafluoroacetone sesquihydrate, and said shrinking agent being selected from the group consisting of methylene chloride and chloroform, said solution having a solubility parameter approximately that of the polyester, said solubility parameter of the solution being defined in accordance with the following: Ss V1S1 + V2S2 where Ss is the solubility parameter of the solution, V1 is the volume fraction of the solvent component, S1 is the solubility parameter of the solvent component, V2 is the volume fraction of the shrinking agent component and S2 is the solubility parameter of the shrinking agent component; and removing all traces of said compacting solution from said compacted fabric.

Claim 12

Dependent Claim 192 words

A process for reducing the porosity of a uniformly porous knitted synthetic linear polyester fabric material which comprises contacting said fabric with a compacting solution containing a minor proportion of a solvent for the polyester and a major proportion of a shrinking agent for the polyester for a time sufficient to uniformly compact said fabric at least about 30 percent measured in the wale direction of the fabric, said solvent being selected from the group consisting of hexafluoroisopropanol, phenol, meta-cresol, hexafluoroacetone propylene adduct, trichloroacetic acid, parachlorophenol and hexafluoroacetone sesquihydrate, and said shrinking agent being selected from the group consisting of methylene chloride and chloroform, said solution having a solubility parameter approximately that of the polyester, said solubility parameter of the solution being defined in accordance with the following: Ss V1S1 + V2S2 where Ss is the solubility parameter of the solution, V1 is the volume fraction of the solvent component, S1 is the solubility parameter of the solvent component, V2 is the volume fraction of the shrinking agent component and S2 is the solubility parameter of the shrinking agent component; and removing all traces of said compacting solution from said compacted fabric.

Claim 13

Dependent Claim 45 words

The process of claim 9 wherein said compacting solution contains from about 2 to about 10 percent by weight of the solution of the solvent for the polymer and from about 98 to about 90 percent by weight of the shrinking agent for the polymer.

Claim 14

Dependent Claim 45 words

The process of claim 10 wherein said compacting solution contains from about 4 to about 8 percent by weight of the solution of the solvent for the polymer and from about 96 to about 92 percent by weight of the shrinking agent for the polymer.

Claim 15

Dependent Claim 11 words

The process of claim 9 wherein said polyester is polyethylene terephthalate.

Claim 16

Dependent Claim 101 words

A process for reducing the porosity of a uniformly porous, relatively smooth-surfaced knitted synthetic linear polyester tubing which comprises immersing said tubing in a compacting solution for a time sufficient to uniformly compact said tubing at least about 30 percent measured in the wale direction of the tubing without appreciable distortion of the smooth surface of the tubing, said compacting solution containing a mixture of from about 2 to about 10 percent by weight of hexafluoroisopropanol and from about 90 to about 98 percent by weight of methylene chloride; and removing all traces of said compacting solution from said compacted fabric.

Claim 17

Dependent Claim 101 words

A process for reducing the porosity of a uniformly porous, relatively smooth-surfaced knitted synthetic linear polyester tubing which comprises immersing said tubing in a compacting solution for a time sufficient to uniformly compact said tubing at least about 30 percent measured in the wale direction of the tubing without appreciable distortion of the smooth surface of the tubing, said compacting solution containing a mixture of from about 2 to about 10 percent by weight of hexafluoroisopropanol and from about 90 to about 98 percent by weight of methylene chloride; and removing all traces of said compacting solution from said compacted fabric.

Claim 18

Dependent Claim 24 words

The process of claim 13 wherein said tubing is immersed in the said compacting solution for from about 30 seconds to about 30 minutes.

Claim 19

Dependent Claim 23 words

The process of claim 14 wherein said tubing is immersed in the said compacting solution for from about 5 to about 15 minutes.

Claim 20

Dependent Claim 33 words

The process of claim 13 wherein said solution contains from about 4 to about 8 percent by weight of hexafluoroisopropanol and from about 96 to about 92 percent by weight of methylene chloride.

Claim 21

Dependent Claim 11 words

The process of claim 13 wherein the polyester is polyethylene terephthalate.

Claim 22

Dependent Claim 16 words

The process of claim 13 wherein the yarn in said tubing has a denier of 40.

Claim 23

Dependent Claim 16 words

The process of claim 13 wherein the yarn in the tubing has a denier of 70.

Claim 24

Dependent Claim 200 words

A process for preparing a synthetic inter-cardiac prosthesis comprising the steps of: a. providing a knitted synthetic linear polyester fabric material having a uniform porosity, measured on the Wesolowski scale, above about 7,500 up to about 20,000 and in excess of that suitable for long-term healing effects without undue hemorrhaging at implantation; b. immersing said porous knitted synthetic linear polyester fabric material in a compacting solution consisting essentially of from about 2 to about 10 percent by weight of an acidic organic component selected from the group consisting of hexafluoroisopropanol, phenol, meta-cresol, hexafluoroacetone propylene adduct, trichloroacetic acid, parachlorophenol and hexafluoroacetone sesquihydrate and about 98 to about 90 percent by weight of a halogenated aliphatic hydrocarbon selected from the group consisting of methylene chloride, chloroform, tetrachloroethane and ethylene dichloride until said fabric material uniformly shrinks at least about 30 percent measured in the wale direction and the porosity of the said fabric material is, measured on the Wesolowski scale, from about 30 to about 5,000 and suitable for long-term healing effects without undue hemorrhaging at implantation; c. removing said compacted fabric material from said compacting solution; and d. washing said compacted fabric material to remove all traces of said compacting solution.

Claim 25

Dependent Claim 200 words

A process for preparing a synthetic inter-cardiac prosthesis comprising the steps of: a. providing a knitted synthetic linear polyester fabric material having a uniform porosity, measured on the Wesolowski scale, above about 7,500 up to about 20,000 and in excess of that suitable for long-term healing effects without undue hemorrhaging at implantation; b. immersing said porous knitted synthetic linear polyester fabric material in a compacting solution consisting essentially of from about 2 to about 10 percent by weight of an acidic organic component selected from the group consisting of hexafluoroisopropanol, phenol, meta-cresol, hexafluoroacetone propylene adduct, trichloroacetic acid, parachlorophenol and hexafluoroacetone sesquihydrate and about 98 to about 90 percent by weight of a halogenated aliphatic hydrocarbon selected from the group consisting of methylene chloride, chloroform, tetrachloroethane and ethylene dichloride until said fabric material uniformly shrinks at least about 30 percent measured in the wale direction and the porosity of the said fabric material is, measured on the Wesolowski scale, from about 30 to about 5,000 and suitable for long-term healing effects without undue hemorrhaging at implantation; c. removing said compacted fabric material from said compacting solution; and d. washing said compacted fabric material to remove all traces of said compacting solution.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-12-09	1978-06-10	1978-12-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-12-09	1982-06-10	1982-12-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-12-09	1986-06-10	1986-12-10	$7700.00	Window Closed / Lapsed

Compaction of polyester fabric materials

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