Tampon

Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...

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Details

604385R, 604380, 604904, A61F 1316

Patent

active

046278494

ABSTRACT:
The exterior of a compressed tampon, e.g. for absorbing menstrual discharge, is formed from a bat of substantially aligned absorbent fibers that have been preshortened in a microundulated state as a result of longitudinal compressive pretreatment. The preshortening, generally more than 20% of original length of the fibers, is selected to permit substantial recovery of original dimension, there being at least 10 of the microundulations per inch prior to incorporation in the tampon. The microundulations are shape-retentive (in the dry state) and reside with the sides of adjacent microundulations close together. Because of the pretreated state, the absorbent fibers have stored mechanical energy in a predetermined selected direction within the final tampon. They are highly moisture sensitive, responsive to small amounts of liquid to cause release of the mechanical energy and expansion in the given direction to cause rapid expansion of the exterior of the tampon. One preferred tampon has such a pretreated outer layer and an inner core of nontreated tampon material, though many other constructions are possible. In this preferred tampon the pretreated outer layer serves as a high-speed transfer member to uniformly distribute the fluids about the core to produce high rate of expansion, high total expansion and improved absorbency.

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