DE8611989U1 - Medical plaster tape block - Google Patents

Description

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Description Medical Plaster Tape Block

The invention relates to the field of moisture vapor permeable adhesive tapes for application to mammalian skin. It also relates to adhesive tape blocks comprising a plurality of pressure-sensitive adhesive-coated sheet layers arranged one above the other and having means for manually separating one of the sheets from the remainder of the block.

Pressure sensitive tapes are commonly used to secure bandages, instruments and other items to the body, and are often used as primary dressings themselves to cover minor wounds and incisions. Historically, such adhesive tapes have been provided in roll form and the user must cut or tear the desired length to suit the intended purpose. Extra wide medical adhesive tapes are available in individually cut lengths on a release strip. Such lengths are typically used to secure and adjust a large absorbent dressing to the body.

Numerous disadvantages are associated with medical plaster bandages.

or in roll form.* First, the plaster tapes must be cut or torn to the required length, which is inconvenient and time-consuming. When the plaster tape is used to change a dressing on an infected patient in an isolated area, it is often necessary to take the entire roll of tape into the infected area, where it becomes exposed to contamination. When changing a dressing requires several strips of the plaster tape, a number of strips are often cut or torn from the roll and temporarily attached to a bed, card, etc. to save time. These strips tend to curl and stick together; they are generally difficult to handle.

Sterilization of rolls of adhesive tape is difficult and inefficient when only a few lengths of adhesive tape are needed.

While some of the aforementioned disadvantages are overcome by providing individual lengths of tape on a release strip, tape in this form is expensive and can only be used in tapes of a certain width and for specialized applications such as large bandage covers.

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The medical adhesive tape block of the invention overcomes the disadvantages of adhesive tape in roll form, yet it does not require cover strips and is inexpensive to manufacture.

Blocks made of a variety of sheet layers, which are

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and are described, for example, in U.S. Patent Nos. 2,030,135; 2,538,602; 2,574,152; 2,724,847; 3,083,393; 3,655,543; 3,373,457; 3,785,102; 4,107,811 and 4,143,194. These patents are primarily intended for cleaning shoe soles, removing lint from clothing and other surfaces, attaching labels, photographs and the like to surfaces, and similar purposes. More recently, the use of notepads with a low tack, pressure-sensitive adhesive coating, such as the "Post-it" notepads marketed by 3M, has found widespread application. However, the blocks of the current technology have not been intended or proposed for medical applications.

The invention provides a patch tape block for application to mammalian skin, comprising (a) a plurality of flexible sheet layers, each having an upper surface and a lower surface and stacked

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arranged one above the other; (b) a base carrier bonded to the lower surface of the lowermost sheet in the stack; (c) a coating of a hypoallergenic pressure sensitive adhesive on a substantial portion of the lower surface of each sheet removably adhering the sheet to the upper surface of the underlying sheet; each of the adhesive coated sheets having a moisture vapor permeability of at least 300 g/m²/24 hrs at 40 ⁰ C and 80% relative humidity; and (d) means

to facilitate manual separation of the sheets. !■

The preferred means for facilitating manual separation of the sheet plies are cover strips disposed between smaller portions of the sheet plies and extending to one of their edges. These cover strips enable a user to easily remove a sheet from the remainder of the pad and apply the removed sheet to the skin. The cover strip is then removed from the sheet so that the entire adhesive coating on the sheet adheres to the skin.

The plaster tape blocks of the invention can be formed with sheet layers of any desired dimension. They can be used in the same way as medical plaster tapes in roll form, except _that

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they offer significant advantages in many cases. There is no longer a need to cut or tear strips from a roll. Therefore, non-tearable backing materials can be used, which were previously unsuitable and undesirable for roll-form adhesive tape. The blocks are efficient to use Only the exact number of adhesive tape strips required for changing a dressing etc. need to be taken to an infected area or sterilized. Strips can be easily removed from the block when needed.

The invention is explained in detail with reference to the accompanying drawings, in which like numerals refer to like parts.

Fig. 1 is a perspective view of a paving band block

according to the invention;
Fig. 2 is an enlarged edge view showing a sheet being separated from the block shown in Fig. 1.

Figures 1 and 2 show a paving strip block according to the invention, which is generally designated by the number 10.

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The plaster tape block 10 includes a plurality of flexible rectangular sheet layers 12, each having upper and lower major surfaces 14 and 16 and a coating 18 of pressure sensitive adhesive or glue on the lower surface 14. Any flexible sheet material that is permeable to moisture vapor and thus prevents skin maceration can be used for the sheet layers 12.

Conventional tape backings currently used in breathable medical tapes, such as the nonwoven backing in "Micropore" Brand Tape (US Pat. No. 3,121,021), the open mesh polyethylene backing used in "Transpore" Brand Tape, and the woven textile backing used in "Durapore" Brand Tape (all marketed by 3M), are preferred. In addition, non-tearable backings such as "Sontara" polyester spunbond nonwovens, polyester knits, and the like may be used. Breathable films such as polyurethane films, which are very thin and stretchable, are less preferred because they are more difficult to handle without a cover strip. Each sheet layer (after being coated with pressure sensitive adhesive) should have a moisture vapour permeability of at least 300 g/m²/24 hours at 40 ⁰ C and a relative humidity of 80 %, measured using the conventional Payne cup method of USI-PS 36 45 853.

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Hypoallergenic adhesives that can be used are the normal adhesives that are applied to the skin. The term "hypoallergenic" as used herein refers to those adhesives that show acceptable performance in the 21-day Draize test on human subjects. Examples of preferred adhesives are those described in UG-PS RE 24.906, in particular a copolymer of 96% isooctyl acrylate units and 4% acrylamide units and a copolymer of 10% isooctyl acrylate units and 6% acrylic acid units. Other suitable adhesives are those described in U.S. Patent No. 3,389,827, which are block copolymers having 3 or more polymer block structures having a general configuration -ABA-, wherein each block A is a thermoplastic polymer block having a glass transition temperature above room temperature (i.e., above about 20 ^° C) and an average molecular weight between about 5,000 and 125,000, and B is a polymer block of a conjugated diene having an average molecular weight between about 15,000 and 250,000. Additional examples of suitable adhesives are isooctyl acrylate/n-vinylpyrrolidone copolymer adhesives and crosslinked acrylate adhesives, such as those described in U.S. Patent No. 4,112,213. The incorporation in the adhesive of drugs or antimicrobial agents such as iodine is

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suitable for enhancing wound healing and preventing infections.

In some cases, an adhesive-repellent backing must be applied to the upper surface 16 of the sheet layer 12
applied to allow easy separation of the adhesive-coated lower surface on a sheet of
the upper surface of the underlying leaf
Such adhesive-repellent backings
Coatings are used in the field of manufacturing
Bands and include materials such as silicone and

Polyvinylcarbamate. f-

Certain plastic sheets, such as polyethylene &iacgr;;

Sheet material used in Transpore-Brand Tape j

is., the properties of the adhesive already show ■

Instruction so that no adhesive-repellent backing;

Layering is required. ■

i The sheet layers 12 are placed on a removable base or 1

i base support 11 arranged in a stack, which preferably j.

less flexible than the leaf layers 12. Examples of
a suitable material for the base support is "Polyslik"
of types S-8002, S-8003, S-8004 (HP Smith Company,
Division of Schoeller Paper Company) and Akrusil Type
2B-0 (Akrosil Division of Thillmany Paper Company).

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The plaster tape pad 10 also includes a plurality of similarly sized cover strips 22, each of which is adhered to the pressure sensitive adhesive coating 18 over a corresponding minor portion of one of the sheets 12 and extends to a corresponding peripheral edge 24 of that sheet layer 12. The sheet layers 12 are generally arranged with their peripheries aligned with one another, with the first and second surfaces 14 and 16 of adjacent sheet layers 12 facing one another, such that the pressure sensitive adhesive coatings 18 on the major portions of the sheet layers 12 removably adhere the sheet layers 12 together, while the cover strips 22 separate the minor portions of the sheet layers 12 to facilitate manual intervention and separation of the sheets 12 from the remainder of the pad 10. The cover strips separate the edge portions of the sheet plies along one of their edges and adhere sufficiently to the adhesive coatings so that they remain adhered to the sheet plies while the cover strip and edge portion are gripped on a dt-r sheet to separate the sheet from the rest of the pad. The cover strip is then readily severed from the sheet either before or after the sheet has been adhered to the skin.

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The materials used to form the cover strips 22 are those commonly used as release strips to protect pressure sensitive adhesive coatings prior to their use. Examples include No. 43 "S/N 61" ClS (Weyerhauser Company), Polyslik (8003 (H.P. Smith Co.), Akrosil (Akrosil) 40-5 UBL 20-1.

Alternative means (not shown) may also be used to facilitate manual separation of the sheet layers. For example, an edge of the sheet layer may be left uncoated so that the edge does not adhere to the underlying sheet and thus forms a nose portion or protrusion that can be grasped with the fingers. This means is less preferred because once the sheet is placed on the skin, the uncoated nose portion does not adhere to the skin and generally requires removal. Perforations along the inner edge of the uncoated nose portion facilitate removal of the nose portion from the adhesive-coated portion of the sheet.

Other alternative nose forming materials may be a coating over the nose area of the adhesive to make it tack-free or the use of a non-removable nose material, e.g. paper or foil. This could be an adhesive coated material.

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whose adhesive side is in contact with the adhesive suite of sheet 12. Perforations along the inner edge of the uncoated nose portion facilitate removal of the nose portion from the adhesive portion of the strip.

The paving block of the invention can be used in any

I desired dimensions. Blocks with

I Dimensions of 2 x 15 cm are conveniently used for

I used the same applications as belts in roll

I form. Bandage covers are usually of larger

I dimensions, e.g. 6 x 10 cm for small dressings and 15 x 10 cm

I 25 cm for larger bandages.

I The production of the paving blocks of the invention can

f using generally known layering techniques

i Specific examples of possible techniques

I include the normal unfolding of the adhesive-coated

.sheet layers up to the specifically desired number and the

1 subsequent cutting of this initial block in finished

I special blocks of sizes suitable for the

&iacgr; prove suitable for the intended use.

Other alternatives are to cut each adhesive coated sheet to size _% with a rotary or fixed die cutter and

? Stacks individual sheets to reach the total number of layers

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To support each pad and provide surface protection for the adhesive face of the bottom sheet layer in each pad, a base carrier is provided, which is typically a release coated cover strip.

These cover strips can be attached to each block at a convenient step during the manufacture of the block.

Many paving tape blocks of this type can be arranged into single width or length dimensions and then cut to other specific dimensions as a stack. They can also be manufactured in multiple widths or lengths, with both dimensions cut after the block stack is complete. The cutting and punching methods used are state of the art and are used in many industries in the manufacture of sheet and block materials.

The invention is further illustrated by the following examples.

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example 1

A nonwoven medical tape as described in US Pat. No. 3,121,021 and known as Micropore® Tape (available from 3M) was used as the base tape material for this example. The particular tape used as the base material was 33.1 cm (15 in.) wide. A cover strip was inserted into the tape construction; 20 sheet plies with cover strips on one edge were unfolded to form base blocks of approximately 38.1 x 45.7 cm (15 in. x 18 in.). A single sheet of printed release strip coated with a silicone release material was used as the base support for the base block construction. Using a paper cutter, blocks of finished sizes ranging from 2 cm x 15 cm to 15 cm x 25 cm were cut from the base block. Each individual block consisted of:

1) 20 sheets of nonwoven plaster tape, each with a cover strip at one end, unfolded into a stack. The particular cover strip material used in this example was a No. 43 silicone coated paper of the type known as "S/N 61" ClS , manufactured by The Weyerhauser Company

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will be produced.

2) A silicone coated release liner used as the base carrier was a sheet of cover liner construction No. 63, Akrosil, Type 2B-0 (Akrosil Division of Thillmany Paper Company).

Example 2

A structure similar to that of Example 1 was prepared, except that the base material used was an embossed plastic-like tape material

wai, ds.-5 known as Transpore from 3M. This tape material has a modified polyethylene film and

^iM a resin modified adhesive based on

'■■'■}'<? Isooctyl acrylate and acrylic acid. The tape material has

a moisture vapor transmission rate of more than 1,500 g/m²/24 hours at 40 ⁰ C and 80 % relative humidity.

Example 3

A construction similar to that of Example 1 was prepared, except that the base tape material used was a fabric backed tape known as Durapore from 3M. This tape material consists essentially of woven rayon acetate.

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Taffeta cloth coated with an isooctyl acrylate and acrylic acid adhesive and having an adhesive-repellent backing of a polyvinyl-n-octadecyl carbamate. This tape material has a moisture transfer rate of over 350 g/m²/24 hours at 40 ⁰ C and 80 % relative humidity.

Example 4

A construction similar to that of Example 1 was prepared except that the base tape material used was based on a nonwoven nylon sheet construction. This nonwoven is known as Asahi 3030 backing material (Asahi Chemical Industry Company, Ltd., Japan). This tape material has a moisture vapor transmission rate of about 350 g/m2/24 hrs. at 40 ^° C and 80% relative humidity.

Example 5

A construction similar to that of Example 1 was made, except that an area of tape backing on the otherwise fully coated backing was left uncoated. In subsequent block making, this uncoated area was used as the "nose end" of the plaster tape sheet. This

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The uncoated area provided a non-pressure-sensitive surface by which the Bäfidblätt could be gripped when it was removed from the block.

Example 6

A construction similar to that of Example 5 was prepared except that a cover strip with perforations was provided between the coated and uncoated areas of each tape sheet. This perforation allowed the uncoated nasal area to be easily separated from the coated sheet after the sheet had been applied to the skin.

Example 7

A construction similar to that of Example 1 was prepared, except that the "nose" portion of the tape sheet was prepared by coating a portion of the normal adhesive coating with a non-pressure sensitive film-forming material (polyvinyl carbamate) to make it non-tacky to the touch. This construction was then used as the starting nose portion for corresponding tape strips.

Claims (10)

1. Paving tape block made of (a) a plurality of flexible sheet layers suitable for application to mammalian skin, each having a lower surface and an upper surface and arranged in a stacked manner; (b) a base carrier having an adhesive-repellent surface bonded to the lower surface of the bottommost sheet in the stack; (c) a coating of a pressure-sensitive adhesive on a substantial portion of the lower surface of each sheet removably adhered to the upper surface of the underlying sheet; and (d) an adhesive-free part on at least one edge of the sheet layer to facilitate manual separation of the sheet layers, * characterized in that the pressure-sensitive adhesive jjj is hypoallergenic and each of the adhesive-coated Leaves have a moisture vapor permeability of at least 300 g/m²/24 hours at 40 ⁰ C and a relative humidity of 80 %. : _s 2. A plaster tape block according to claim 1, characterized in that to facilitate manual separation of the sheets, a cover strip is provided which is adhesively arranged to a minor portion of the pressure sensitive coating of each sheet along at least one peripheral edge. 3. A plaster tape block according to claim 1, characterized in that the base carrier has a cured silicone coating on a substrate. 4. Paving tape block according to claim 1, characterized in that the sheet layers are formed from a fleece. 5. Paving tape block according to claim 1, characterized in that the sheet layers are formed from a plastic film 6. Paving tape block according to claim 5, characterized in that the plastic film is polyethylene. 7. Paving tape block according to claim 1, characterized in that the sheet layers are formed from a woven textile material. 8. Paving tape block according to claim 1, characterized in that to facilitate the manual separation of the sheets, a nose part is provided which is formed thereby &bull; ■ did ti ·· ·· · ..ran is that a minor portion of the lower surface of each sheet along at least one peripheral edge is not coated with adhesive. 9. Plaster tape block according to claim 8, characterized in that perforations are provided between the nose part and the rest of the sheet, which enable the removal of the nose part. 10. A plaster tape block according to claim 1, characterized in that to facilitate manual separation of the sheet layers, a nose portion is provided which is formed by coating a minor portion of the adhesive along at least one peripheral edge with a non-adhesive material.