Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...
Reexamination Certificate
2000-01-03
2001-05-22
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Web, sheet or filament bases; compositions of bandages; or...
C424S449000, C424S443000, C602S057000, C602S058000
Reexamination Certificate
active
06235307
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a medicated plaster, more particularly to a medicated plaster which is convenient to use.
2. Description of the Related Art
Medicated plasters are generally oil-based medicated plasters or water-based medicated plasters.
FIG. 1
illustrates a conventional oil-based medicated plaster which includes a base sheet
11
formed from a non-woven fabric, and a layer of medicinal paste
12
applied on the base sheet
11
. A cover sheet
13
is provided releasably on the layer of medicinal paste
12
for covering the same. The medicinal paste
12
is typically prepared by mixing a medicinal substance with a rubber, a resin, and an organic solvent. The layer of medicinal paste
12
is relatively sticky, and can be attached firmly to the skin of a person. The cover sheet
13
is made of paper or plastic, such as PET, and is treated with a release agent. The cover sheet
13
prevents different parts of the layer of medicinal paste
12
from sticking together, and prevents dissipation of the medicinal substance. In use, the cover sheet
13
is removed to expose the layer of medicinal paste
12
, which is then attached directly on the skin of the person. However, the medicated plaster covers the pores of the skin, and prevents the discharge of sweat from the pores of the skin, thereby resulting in discomfort to the skin of the user. In addition, when the medicated plaster is removed from the skin, it is likely that hairs on the skin of the user are removed together with the medicated plaster. Therefore, the oil-based medicated plaster unavoidably causes discomfort and pain to the user during use.
Referring to
FIG. 2
, a conventional water-based medicated plaster includes a medicated piece
15
and an adhesive piece
14
. The adhesive piece
14
includes a base sheet
141
made of a non-woven fabric and applied with an adhesive layer
142
, and a cover sheet
144
having a release surface
143
facing the adhesive layer
142
and treated with a release agent. Prior to use of the medicated plaster, the cover sheet
144
is laid on the adhesive layer
142
for covering the same, as shown by the phantom lines in FIG.
2
. The medicated piece
15
includes a support layer
151
formed of a non-woven fabric, a medicated composition layer
152
applied on the support layer
151
, and a waterproof protective layer
153
disposed on the medicated composition layer
152
for covering the same. In order to prevent the medicated composition in the medicated composition layer
152
from permeating into the adhesive layer
142
to undesirably decrease the adhesive strength of the adhesive layer
142
, the medicated piece
15
and the adhesive piece
14
are packed separately in different inner bags, which are then received in an outer bag. In use, the inner and outer bags are each opened to permit joining of the medicated piece
15
to the adhesive piece
14
by removing the cover sheet
144
from the adhesive piece
14
to expose the adhesive layer
142
, and attaching the support layer
151
of the medicated piece
15
to the adhesive layer
142
. The adhesive layer
142
has a size larger than that of the medicated piece
15
such that the medicated piece
15
can be adhered to a central portion of the adhesive layer
142
to expose a peripheral portion of the adhesive layer
142
around the medicated piece
15
. Finally, the protective layer
153
is removed to permit attachment of the medicated plaster to the skin of the user. The water-based medicated plaster is found to be more comfortable to the skin of the user. However, as the joining of the medicated piece
15
to the adhesive piece
14
involves complicated procedures, the conventional water-based medicated plaster of
FIG. 2
is not convenient to use, especially for an old person or a person who is injured at certain body parts. Therefore, the conventional medicated plasters of
FIGS. 1 and 2
are not satisfactory.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a medicated plaster which is convenient to use and which does not cause discomfort to the skin of a user.
Accordingly, the medicated plaster of the present invention includes a fabric base sheet, a medicated composition layer, a waterproof isolating layer, and a waterproof protective layer. The base sheet has an upper surface formed with an adhesive layer. The medicated composition layer is disposed above the adhesive layer, and has a medicated composition. The isolating layer is disposed between and is in contact with the adhesive layer and the medicated composition layer so as to prevent the medicated composition from contacting the adhesive layer. The adhesive layer has skin contact portions which are exposed on at least two opposite sides of the isolating layer. The protective layer is disposed on the medicated composition layer for covering the medicated composition layer.
REFERENCES:
patent: 5415627 (1995-05-01), Rasmussen et al.
patent: 5476443 (1995-12-01), Cartmell et al.
Ghali Isis
Page Thurman K.
Rodman & Rodman
Taiwan Three Mast Pharmaceutical Co., Ltd.
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