Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1994-09-22
1997-07-22
Polutta, Mark O.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
6043852, 604387, A61F 1315, A61F 1320
Patent
active
056499175
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a sanitary napkin comprising comprising two longitudinal sides and two lateral sides, overlying the second face of the core, and migration in a direction generally parallel to the lateral sides.
BACKGROUND OF THE INVENTION
Such a sanitary napkin is known from the British patent application GB 2 168 253.
In this patent application, the barrier means are located outside the perimeter of the core and are formed by an elasticised upstanding part of the topsheet and the backsheet. While lateral liquid migration is reduced by the barrier means, the rate of absorption of liquid entrapped between the barrier means and the core may be reduced. The known sanitary napkin may also undergo a shift in position during use.
It is an object of the invention to provide for barrier means in a sanitary napkin which are comfortable during use, which effectively restrict lateral spread of body fluids and which allow adequate absorption.
It is another object of the invention to provide a sanitary napkin which can be reliably positioned with respect to a user's undergarment.
SUMMARY OF THE INVENTION
A sanitary napkin according to the invention is characterized in that the barrier means comprise a wall having a free edge which is elevated above the plane of the first face of the core, the free edge being, at least during use of the sanitary napkin, located within the perimeter of the core.
By placing the barrier means so that at least the free edge is during use located on top of the absorbent core, instead of beside it, the liquid that is stopped by the barrier means from laterally spreading along the topsheet, is readily absorbed by the core.
Another absorbent article according to the invention is characterized in that the backsheet extends beyond the perimeter of the core to form flaps for attachment to a garment during use, the barrier means comprising a wall that is connected to the flaps adjacent the perimeter of the core.
The flaps can fold upward around the edge of an undergarment of the wearer, as is disclosed in U.S. Pat. No. 4,687,478 which is hereby incorporated by reference. It was found, that the flaps in combination with the barrier means provide for reduced lateral migration of body fluids. The barrier means can be formed by a liquid-impermeable wall or by an absorbent strip which is connected, for instance by gluing or by fusion bonding, to the flaps. The free edge of the wall is preferably located within the perimeter of the core during use of the sanitary napkin for effective absorption of the body fluids that are retained by the wall. It is however also possible that the fee edge of the wall is located outside the perimeter of the core, or, for instance when a shaped core is used, is located within the perimeter of the core for the broader parts of the core only.
An embodiment of an absorbent article according to the invention is characterized in that the wall is formed by a spacing member located between the topsheet and the backsheet.
The spacing member can be formed by a cantilever of flexible material that is placed between the topsheet and the backsheet outside the perimeter of the core and that presses the topsheet upwards. During use of the sanitary napkin, the napkin is compressed in a direction of the lateral sides and the topsheet is lifted by the cantilever. Preferably the free edge of the wall that is formed by the topsheet and the cantilever is pressed within the perimeter of the core during use of the sanitary napkin, to provide a good absorption of body fluids retained by the cantilever.
The barrier means can also comprise a foam strip which is glued, or otherwise connected, between the topsheet and the core or which is glued on top of the topsheet.
Another embodiment of an absorbent article according to the invention is characterized in that the barrier means comprises the topsheet, the topsheet having a central part overlaying the core and marginal parts forming the wall along the longitudinal sides of the core.
Even though the topsheet is
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Mancel Claude Paul
Roberts John David
Linman E. Kelly
Miller Steven W.
Polutta Mark O.
Rasser Jacobus C.
The Procter & Gamble & Company
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