US3937223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compacted surgical hemostatic felt
Assignee: Wyeth Holdings LLC
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Filing: 1974-04-19
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Granted: 1976-02-10
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Expires: 1994-04-19
Abstract
Abstract Tissue absorbable synthetic polymeric fibers, such as polyglycolic acid, are felted to form a thin mat with at least one, and preferably both, surfaces compacted by contact with a heated embossing surface such as a hot roller. Porosity is reduced but the compacted felt retains its flexibility, and conforms readily to the surface of a bleeding wound to give effective rapid hemostasis. The hemostatic felt is conveniently but not necessarily allowed to remain in place during the healing process and is absorbed by living tissue.
Inventors
- 👤 Roy William Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:36
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/64; A61L27/00; A61L27/50; A61L27/58; A61L2400/00; A61L2400/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A hemostatic surgical felt comprising a sterile felt of fibers of 0.5 to 12 denier and 1/4 inch to 3 inch length of a tissue absorbable polymer subject to hydrolytic degradation to non-toxic tissue compatible absorbable components, and which polymer has glycolic acid ester linkages, which felt has a weight of 0.5 ounce to 12 ounces per square yard and textured and partially compressed heat embossed surfaces, whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in a living tissue.
Claim 2
Dependent Claim
94 words
A hemostatic surgical felt comprising a sterile felt of fibers of 0.5 to 12 denier and 1/4 inch to 3 inch length of a tissue absorbable polymer subject to hydrolytic degradation to non-toxic tissue compatible absorbable components, and which polymer has glycolic acid ester linkages, which felt has a weight of 0.5 ounce to 12 ounces per square yard and textured and partially compressed heat embossed surfaces, whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in a living tissue.
Claim 3
Dependent Claim
15 words
The hemostatic felt of claim 1 in which the tissue absorbable polymer is polyglycolic acid.
Claim 4
Independent Claim
143 words
A method of protecting the exposed wound surfaces of an internal organ of a living mammal which comprises covering said wound surface with a sterile hemostatic surgical felt of fibers of 0.5 to 12 denier and 1/4 inch to 3 inch length of a tissue absorbable polymer subject to hydrolytic degradation to non-toxic tissue compatible absorbable components, and which polymer has glycolic acid ester linkages, which felt has a weight of 0.5 ounce to 12 ounces per square yard and textured and partially compressed heat embossed surfaces, whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in living tissue, attaching the said felt to said organ, closing the said organ into said living mammal, and during the healing process, absorbing said felt into the body tissues of said mammal.
Claim 5
Independent Claim
143 words
A method of protecting the exposed wound surfaces of an internal organ of a living mammal which comprises covering said wound surface with a sterile hemostatic surgical felt of fibers of 0.5 to 12 denier and 1/4 inch to 3 inch length of a tissue absorbable polymer subject to hydrolytic degradation to non-toxic tissue compatible absorbable components, and which polymer has glycolic acid ester linkages, which felt has a weight of 0.5 ounce to 12 ounces per square yard and textured and partially compressed heat embossed surfaces, whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in living tissue, attaching the said felt to said organ, closing the said organ into said living mammal, and during the healing process, absorbing said felt into the body tissues of said mammal.
Claim 6
Dependent Claim
13 words
The method of claim 3 in which the internal organ is the liver.
Claim 7
Dependent Claim
14 words
The method of claim 3 in which the internal organ is of neural tissue.
Claim 8
Dependent Claim
13 words
The method of claim 5 in which the internal organ is the brain.
Claim 9
Dependent Claim
164 words
A hemostatic surgical felt comprising a sterile felt of air laid fibers of a tissue absorbable polymer of glycolic acid of 0.5 to 12 denier and 1/4 inch to 3 inch length which felt has textured and partially compressed heat embossed surfaces, a weight of about 2.25 ounces per square yard, a stiffness of 1.05 to 1.83 inches, measured as one half the length of the overhang of a specimen on a flat horizontal surface which drops to an angle of 411/2° and which before embossing is too fragile for stiffness measurement, and an air permeability of about 135 cubic feet per minute per square foot at 0.5 inches of water pressure differential, and which before embossing has an air permeability of about 360 cubic feet per minute per square foot at 0.5 inches of water pressure differential whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in living tissue.
Claim 10
Dependent Claim
164 words
A hemostatic surgical felt comprising a sterile felt of air laid fibers of a tissue absorbable polymer of glycolic acid of 0.5 to 12 denier and 1/4 inch to 3 inch length which felt has textured and partially compressed heat embossed surfaces, a weight of about 2.25 ounces per square yard, a stiffness of 1.05 to 1.83 inches, measured as one half the length of the overhang of a specimen on a flat horizontal surface which drops to an angle of 411/2° and which before embossing is too fragile for stiffness measurement, and an air permeability of about 135 cubic feet per minute per square foot at 0.5 inches of water pressure differential, and which before embossing has an air permeability of about 360 cubic feet per minute per square foot at 0.5 inches of water pressure differential whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in living tissue.
Claim 11
Independent Claim
215 words
A method of protecting the exposed wound surfaces of an internal organ of a living mammal which comprises covering said wound surface with a sterile hemostatic surgical felt of air laid fibers of a tissue absorbable polymer of glycolic acid of 0.5 to 12 denier and a 1/4 inch to 3 inch length which felt has textured and partially compressed heat embossed surfaces, a weight of about 2.25 ounces per square yard, a stiffness of 1.05 to 1.83 inches, measured as one half the length of the overhang of a specimen on a flat horizontal surface which drops to an angle of 411/2° and which before embossing is too fragile for stiffness measurement, and an air permeability of about 135 cubic feet per minute per square foot at 0.5 inches of water pressure differential, and which before embossing has an air permeability of about 360 cubic feet per minute per square foot at 0.5 inches of water pressure differential, whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in living tissue, attaching the said felt to said organ, closing the said organ into said living mammal, and during the healing process, absorbing said felt into the body tissues of said mammal.
Claim 12
Independent Claim
215 words
A method of protecting the exposed wound surfaces of an internal organ of a living mammal which comprises covering said wound surface with a sterile hemostatic surgical felt of air laid fibers of a tissue absorbable polymer of glycolic acid of 0.5 to 12 denier and a 1/4 inch to 3 inch length which felt has textured and partially compressed heat embossed surfaces, a weight of about 2.25 ounces per square yard, a stiffness of 1.05 to 1.83 inches, measured as one half the length of the overhang of a specimen on a flat horizontal surface which drops to an angle of 411/2° and which before embossing is too fragile for stiffness measurement, and an air permeability of about 135 cubic feet per minute per square foot at 0.5 inches of water pressure differential, and which before embossing has an air permeability of about 360 cubic feet per minute per square foot at 0.5 inches of water pressure differential, whereby the rate of penetration of blood is reduced, and the adhesion to bleeding surfaces enhanced, and which is completely absorbed when enclosed in living tissue, attaching the said felt to said organ, closing the said organ into said living mammal, and during the healing process, absorbing said felt into the body tissues of said mammal.
References Cited (Backward Citations)
US3122479A
Cited
US2896618A
Cited
US3739773A
Cited
US3545442A
Cited
US3542634A
Cited
US3666750A
Cited
US3797499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |