Adhesive material with removable carrier

Surgery: splint – brace – or bandage – Bandage structure – Skin laceration or wound cover

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Details

602 52, 602 54, A61F 500

Patent

active

057556814

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to conformable materials such as wound dressings and adhesive tapes, eg. tapes for attaching non-adhesive dressings to a patients body; and to methods of making such conformable materials.
Conventional adhesive dressings comprise a backing layer, eg. a thin film layer, having an adhesive layer on one surface, a removable protector covering the adhesive layer and a carrier layer on the non-adhesive surface of the backing layer are known. Such dressings may be provided with a v-shaped handle to facilitate removal of the protector layer in particular. Such dressings include those available as OPSITE FLEXIGRID (Trade Mark) in the UK from Smith & Nephew Medical.
Flexible or conformable articles, such as adhesive medical tapes, surgical sheets, adhesive dressings and plasters provided with an adhesive surface covered by a protective paper film layer are known from British Patent Application No.2148125A which describes longitudinal flexible articles provided with a protective paper layer covering an adhesive layer wherein a sinusoidal penetrating slit is provided along the longitudinal axis of the protective paper layer. GB2148125 also acknowledges prior art wherein the penetrating slit is substantially straight and not sinusoidal.
However, generally, thin film flexible or conformable articles, as well as requiring a protector layer over the adhesive, require a carrier layer to facilitate handling of the film once the protector layer is removed. GB2148125 does not describe the use of such carrier layers and conventionally known carrier layers, such as those sold as OPSITE FLEXIGRID are not suitable for use in, eg. adhesive medical tapes which may be in roll form.
Carriers are employed in some adhesive dressings, as described in European Patent Applications 081990, 0340945 and 0168174. However the carriers are provided with v-shaped handles to facilitate removal of the carrier layer. European Patent application 0354315 describes an adhesive dressing with a carrier layer, with a cutting line to aid removal of the carrier layer.
The dressings described in the prior art are not suitable for use in a roll form as the lines for the removal of the carrier layer are perpendicular to the longitudinal axis of the dressing. This does not allow the flexibility of cutting a dressing size to suit and includes a more involved manufacturing process.
The object of the present invention is to provide a flexible material, eg. a dressing or tape material, which may optionally be in roll form and overcomes or mitigates the aforementioned problems.
According to the present invention there is provided a conformable material with a longitudinal axis which comprises a backing layer having an adhesive layer on a first surface and a removable protector covering the adhesive layer and a removable carrier layer on the non-adhesive surface of the backing layer characterised in that the carrier layer is provided with at least one slit substantially parallel to the longitudinal axis of the conformable material.
According to a further feature of the present invention there is provided a conformable material with a longitudinal axis which comprises a backing layer having an adhesive layer on a first surface and a removable protector covering the adhesive layer, the removable protector being provided with a slit substantially the length of one of its axes and a removable carrier layer on the non-adhesive surface of the backing layer characterised in that the carrier layer is provided with at least one slit substantially parallel to the longitudinal axis of the conformable material.
When the carrier layer is provided with a single slit then it comprises two release portions. It will be understood that the carrier layer may comprise more than two release portions. Thus for example the carrier layer may comprise three or four release portions.
When the carrier layer comprises three release portions, the carrier layer will be divided by two slits; when the carrier layer comprises four release portions, the carrier layer w

REFERENCES:
patent: 3285245 (1966-11-01), Eldredge et al.
patent: 4706662 (1987-11-01), Thompson
patent: 5310402 (1994-05-01), Rollband

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