Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...
Patent
1994-07-28
1996-06-18
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Web, sheet or filament bases; compositions of bandages; or...
424445, 424446, 424448, A61F 1300, A61K 970
Patent
active
055275354
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process for the manufacture of a dressing with thinned edges. It further relates, by way of a novel industrial product, to the dressing obtained by this process.
PRIOR ART
EP-A-0 264 299 has disclosed a dressing of the type comprising a support and an adhesive material consisting of a single adhesive layer, in which the edges are chamfered so that the external thickness of the dressing, measured at the periphery, does not exceed 1/4 of the thickness of the dressing in its non-thinned part. The essential advantage of such a dressing is that of avoiding creep of the constituent mass of the dressing.
To manufacture this dressing, EP-A-0 264 299 proposes chamfering the edges of the dressing under drastic conditions by applying a "pressure of 10 to 40 metric tonnes" and a temperature of 90 to 110.degree. C. for 1 to 3 seconds, to the periphery of a pad consisting of the support covered with the adhesive layer.
EP-A-0 358 412 has disclosed a dressing with thinned edges which has a stepped profile from the base to the top and comprises three distinct assemblies. According to the description (see column 2 line 50 to column 3 line 45), the FIGS. (1 and 2) and the reference numbers (reproduced below) of EP-A-0 358 412, these assemblies are as follows: (reference 10) covered on its top face with an adhesive layer (reference 11); width) than the latter, a second assembly consisting of a film (reference 12) which on the one hand is joined by its lower face to the first assembly via the adhesive layer (reference 11) of said first assembly, and which on the other hand is covered with an adhesive layer (reference 16) on its top face; and dimensions (length and width) than the latter, a third assembly consisting of a layer of superabsorbent material (reference 18) lined with a nonwoven (reference 20), said third assembly being joined to the second assembly via the adhesive layer (reference 16) of said second assembly.
At the time of use, the dressing according to EP-A-0 264 299 is attached to the skin via the exposed zones of the adhesive layers of the first and second assemblies.
The technical solutions known in the prior art are found to be impractical. In fact, the solution proposed by EP-A-0 264 299 for avoiding creep involves a drastic treatment as regards the compression required for chamfering, and the solution proposed by EP-A-0 358 412, which is concerned neither with limiting nor with eliminating creep, has the disadvantage on the one hand of increasing the thickness of the dressing at its center, and on the other hand of not being adhesive at its top (i.e. on the upper face of the third assembly).
OBJECT OF THE INVENTION
According to the invention, a novel technical solution is now proposed for avoiding creep of the constituents of the dressing and for mitigating the disadvantages of the prior art.
This novel solution uses at least two adhesive layers superimposed to form a reducing construction from the base to the top, called a stepped construction, the upper layer of this construction, i.e. the one situated at the top, being an adhesive layer.
SUBJECT OF THE INVENTION
According to the invention, a process is therefore recommended for the preparation of a dressing with thinned edges comprising, joined to one another, a support and a film-type adhesive system of reducing thickness in the direction of the periphery, said process comprising the formation of an adhesive system consisting of at least two adhesive layers which are joined to the support, to the top, and together and have different surface areas, the edges of one of the two said adjacent adhesive layers being offset relative to the corresponding edges of the other adhesive layer, the adhesive layer forming the base of said adhesive system, which is joined to the support, having a surface area which is (a) identical to that of said support and (b) greater than the surface area of every other layer of said adhesive system.
The invention further relates to a dressing with thinned edges w
REFERENCES:
patent: 4759354 (1988-07-01), Quarfoot
patent: 4909244 (1990-03-01), Quarfoot et al.
patent: 5066494 (1991-11-01), Becher
patent: 5238685 (1993-08-01), Wren
patent: 5350581 (1994-09-01), Kochinke
Benston, Jr. William E.
Laboratoires D'Hygiene et de Dietetique
Page Thurman K.
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