US4376438A — Method of producing a supporting bandage and band…

Claim 1

Independent Claim 141 words

Process for the preparation of a rigid supporting bandage for surgical or veterinary surgical use which attains weight bearing strength in from five to about fifteen minutes comprising covering the part of the body which requires support with an air-permeable dressing and then applying a self-hardening bandage, characterized in that the self-hardening bandage comprises strips of air-permeable, flexible bandaging fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer which contains free isocyanate groups and has been prepared from aromatic polyisocyanates and polyols containing tertiary amine nitrogen atoms, the prepolymer having an isocyanate content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, the impregnated and/or coated bandaging fabric being soaked with water immediately before its use.

Claim 2

Dependent Claim 141 words

Process for the preparation of a rigid supporting bandage for surgical or veterinary surgical use which attains weight bearing strength in from five to about fifteen minutes comprising covering the part of the body which requires support with an air-permeable dressing and then applying a self-hardening bandage, characterized in that the self-hardening bandage comprises strips of air-permeable, flexible bandaging fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer which contains free isocyanate groups and has been prepared from aromatic polyisocyanates and polyols containing tertiary amine nitrogen atoms, the prepolymer having an isocyanate content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, the impregnated and/or coated bandaging fabric being soaked with water immediately before its use.

Claim 3

Dependent Claim 106 words

Strips of bandaging material suitable for carrying out the process according to claim 1, characterized in that they comprise flexible, air-permeable pieces of fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, the isocyanate prepolymer having an isocyanate group content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, said bandaging material being capable of attaining weight bearing strength in less than about fifteen minutes after being soaked with water.

Claim 4

Dependent Claim 27 words

The bandaging material of claim 2 wherein the air-permeable pieces of fabric have a weight per unit area of from about 20 to 1,000 g/m 2 .

Claim 5

Dependent Claim 23 words

The bandaging material of claim 2 wherein the isocyanate prepolymer has a viscosity of from about 5000 to 50,000 cP at 25° C.

Claim 6

Dependent Claim 35 words

The bandaging material of claim 2 wherein the isocyanate prepolymer has an isocyanate group content of about 10 to 25% by weight and a tertiary amino nitrogen content of about 0.1 to 1.5% by weight.

Claim 7

Dependent Claim 16 words

The bandaging material of claim 2 wherein the isocyanate prepolymer is applied in solvent free form.

Claim 8

Dependent Claim 15 words

The bandaging material of claim 2 wherein the isocyanate prepolymer is applied in solution form.

Claim 9

Dependent Claim 42 words

The bandaging material of claim 2 wherein the isocyanate prepolymer is based on aromatic polyisocyanates which are the phosgenation product of aniline-formaldehyde condensates and polyether polyols having tertiary amino nitrogen atoms and having a molecular weight of from about 300 to 2,000.

Claim 10

Dependent Claim 148 words

A process for the preparation of a rigid supporting bandage which attains weight bearing strength in from five to about fifteen minutes comprising (A) applying an air-permeable dressing to a structural unit which needs support, and (B) applying a self-hardening bandage to the air-permeable dressing, said self-hardening bandage comprising strips of an air-permeable, flexible bandaging fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer, said isocyanate prepolymer (1) being based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, (2) having an isocyanate group content of about 5 to 30% by weight, (3) having a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, and (4) having a viscosity of from about 5000 to 50,000 cP at 25° C. wherein said self-hardening bandage is soaked with water immediately before its application.

Claim 11

Dependent Claim 148 words

A process for the preparation of a rigid supporting bandage which attains weight bearing strength in from five to about fifteen minutes comprising (A) applying an air-permeable dressing to a structural unit which needs support, and (B) applying a self-hardening bandage to the air-permeable dressing, said self-hardening bandage comprising strips of an air-permeable, flexible bandaging fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer, said isocyanate prepolymer (1) being based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, (2) having an isocyanate group content of about 5 to 30% by weight, (3) having a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, and (4) having a viscosity of from about 5000 to 50,000 cP at 25° C. wherein said self-hardening bandage is soaked with water immediately before its application.

Claim 12

Dependent Claim 88 words

A medical supporting material which attains weight bearing strength in from five to about fifteen minutes after being soaked with water comprising flexible air-permeable pieces of fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, the isocyanate prepolymer having an isocyanate group content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 13

Dependent Claim 88 words

A medical supporting material which attains weight bearing strength in from five to about fifteen minutes after being soaked with water comprising flexible air-permeable pieces of fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, the isocyanate prepolymer having an isocyanate group content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 14

Dependent Claim 96 words

A medical supporting material which attains weight bearing strength in from five to about fifteen minutes after being soaked with water enclosed in a moisture free and moisture-impervious container comprising flexible, air-permeable pieces of fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, the isocyanate prepolymer having an isocyanate group content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 15

Dependent Claim 96 words

A medical supporting material which attains weight bearing strength in from five to about fifteen minutes after being soaked with water enclosed in a moisture free and moisture-impervious container comprising flexible, air-permeable pieces of fabric which have been impregnated and/or coated with about 50 to 300% by weight, based on the uncoated fabric, of an isocyanate prepolymer based on aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms, the isocyanate prepolymer having an isocyanate group content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 16

Dependent Claim 155 words

A process for the preparation of a rigid supporting bandage for surgical or veterinary surgical use which attains weight bearing strength in between about 5 and 15 minutes comprising covering the part of the body which requires support with an air-permeable dressing and then applying a self-hardening bandage wherein the self-hardening bandage is prepared by impregnating or coating solvent free strips of air-permeable, flexible bandaging fabric with about 50 to 300% by weight, based on the weight of the untreated fabric, of a solvent free isocyanate prepolymer which contains free isocyanate groups and has been prepared from aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms at an NCO to OH ratio of between about 2:1 and 15:1, the prepolymer having an isocyanate content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, the self-hardening bandage being soaked with water immediately before its use.

Claim 17

Dependent Claim 155 words

A process for the preparation of a rigid supporting bandage for surgical or veterinary surgical use which attains weight bearing strength in between about 5 and 15 minutes comprising covering the part of the body which requires support with an air-permeable dressing and then applying a self-hardening bandage wherein the self-hardening bandage is prepared by impregnating or coating solvent free strips of air-permeable, flexible bandaging fabric with about 50 to 300% by weight, based on the weight of the untreated fabric, of a solvent free isocyanate prepolymer which contains free isocyanate groups and has been prepared from aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms at an NCO to OH ratio of between about 2:1 and 15:1, the prepolymer having an isocyanate content of about 5 to 30% by weight and a tertiary amino nitrogen content of about 0.05 to 2.5% by weight, the self-hardening bandage being soaked with water immediately before its use.

Claim 18

Dependent Claim 120 words

A medical supporting material which attains weight bearing strength in between about 5 and 15 minutes after being soaked with water enclosed in a moisture free and moisture impervious container comprising substantially solvent free flexible, air permeable pieces of fabric, which have been coated or impregnated with about 50 to 300% by weight, based on the weight of untreated fabric, of an isocyanate prepolymer, said prepolymer (a) being the reaction product of aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms prepared with an NCO to OH ratio of between 2:1 and 15:1, (b) having an isocyanate group content of 5 to 30% by weight, and (c) having a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 19

Dependent Claim 120 words

A medical supporting material which attains weight bearing strength in between about 5 and 15 minutes after being soaked with water enclosed in a moisture free and moisture impervious container comprising substantially solvent free flexible, air permeable pieces of fabric, which have been coated or impregnated with about 50 to 300% by weight, based on the weight of untreated fabric, of an isocyanate prepolymer, said prepolymer (a) being the reaction product of aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms prepared with an NCO to OH ratio of between 2:1 and 15:1, (b) having an isocyanate group content of 5 to 30% by weight, and (c) having a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 20

Dependent Claim 29 words

The medical supporting material of claim 13 wherein the polyol containing the tertiary amino nitrogen is the ethoxylation or propoxylation product of ammonia, an amine or an amino alcohol.

Claim 21

Dependent Claim 119 words

A medical supporting material which hardens substantially completely in between about five and fifteen minutes after being soaked with water enclosed in a moisture free and moisture impervious container comprising substantially solvent free flexible, air permeable pieces of fabric, which have been coated or impregnated with about 50 to 300% by weight, based on the weight of untreated fabric, of an isocyanate prepolymer, said prepolymer (a) being the reaction product of aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms prepared with an NCO to OH ratio of between 2:1 and 15:1, (b) having an isocyanate group content of 5 to 30% by weight, and (c) having a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Claim 22

Dependent Claim 119 words

A medical supporting material which hardens substantially completely in between about five and fifteen minutes after being soaked with water enclosed in a moisture free and moisture impervious container comprising substantially solvent free flexible, air permeable pieces of fabric, which have been coated or impregnated with about 50 to 300% by weight, based on the weight of untreated fabric, of an isocyanate prepolymer, said prepolymer (a) being the reaction product of aromatic polyisocyanates and polyols containing tertiary amino nitrogen atoms prepared with an NCO to OH ratio of between 2:1 and 15:1, (b) having an isocyanate group content of 5 to 30% by weight, and (c) having a tertiary amino nitrogen content of about 0.05 to 2.5% by weight.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-03-14	1986-09-13	1987-03-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-03-14	1990-09-13	1991-03-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-03-14	1994-09-13	1995-03-15	$7700.00	Window Closed / Lapsed

Method of producing a supporting bandage and bandaging material suitable for this purpose

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