A - Human Necessities – 61 – L
Patent
A - Human Necessities
61
L
167/324, 18/630
A61L 17/00 (2006.01) A61L 17/14 (2006.01) D01D 5/10 (2006.01) D01F 6/06 (2006.01)
Patent
CA 1098668
Abstract of the Disclosure An isotactic polypropylene suture having good long range flex life and creep resistance is disclosed. Specifically, the suture has a denier of from about 30 to about 3000 and the following characteristics: Tensile Strength-gpd 4.3-7.5 Knot Strength-gpd 3.0-5.0 Percent Elongation to Break 20.0-30.0 Young's Modulus-psi 5.4x105-9.5x105 Flexural Fatigue Resistance (F) (Cycles to break), as defined by, F=1.251x108xD-1.77 where D=denier Static Creep - % Elongation <8.0 To produce the suture, isotactic polypropylene is extruded at a temperature between about 425°F. and about 550°F. into a filament, and is then liquid quenched at about 125°F. to about 175°F. with simultaneous stretching thereof to about 1.0X to about 5.0X. The filament is then passed through a heating and drawing zone at about 205°F. to give from about a 5.0X to about 8.0X draw ratio. This twice-drawn filament is then passed through a second heating and drawing zone at a temperature of about 300 to about 450°F. at a final draw of from about 0.95X to about 1.6X. The fils are then collected and cut to the required length.
282245
Cummings Percival W.
Goodman John H.
American Cyanamid Company
Smart & Biggar
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