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US 5,288,516 AGranted
Process of producing bioabsorbable filaments
AssigneeE. I. Du Pont de Nemours and Company
InventorsMary B. Anderson, Paul D. Seemuth
Life of this patent
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Abstract
In the production of stretch Oriented poly(hydroxycarboxylic acid) filaments suitable for use in medical products (e.g. sutures), high speed production is achievable by application, prior to the drawing step, of a lubricant which minimizes filament breakage and facilitates the use of draw ratios of at least 2:1, more typically at least 5:1.
Claims19
In the process of preparing a stretch-oriented, bioabsorbable poly(hydroxycarboxylic acid) filament, the process comprising the steps of:
- spinning a bioabsorbable poly(hydroxycarboxylic acid) into a filament to produce an as-spun filament, and
- drawing the as-spun filament to produce the stretch-oriented filament;
- the improvement wherein:
- the step of applying to the as-spun filament, prior to the drawing step, a lubricant that is biocompatible with mammals, has sufficient lubricity to minimize filament-to-filament friction and filament breakage, is liquid at the temperature of application, is hydrophobic, and has a viscosity at the temperature of application of about 1 to about 100 cp.
1 more element
A process for the production of bioabsorbable poly(hydroxycarboxylic acid) filaments, comprising the steps of:
- spinning bioabsorbable poly(hydroxycarboxylic acid) into a filament,
- without intermediate collection of the spun filament, applying a lubricant to the spun filament and stretch-orienting said filament at a draw ratio of at least 2X, said lubricant being a silicone oil;
- a liquid, lower aliphatic stearate ester;
- a liquid, lower aliphatic polyol ester of a C.sub.8 to C.sub.10 aliphatic carboxylic acid;
- or a mixture thereof, said lubricant having a room temperature viscosity in the range of about 1 to about 100 cp, and
- collecting the resulting stretch-oriented filament at a windup speed greater than 100 m/min.
3 more elements
Dependencies are inferred from the claim text.