Surgery: splint – brace – or bandage – Bandage structure – Support covering
Reexamination Certificate
2000-04-07
2001-07-31
Lewis, Kim M. (Department: 3761)
Surgery: splint, brace, or bandage
Bandage structure
Support covering
C602S044000, C602S075000
Reexamination Certificate
active
06267744
ABSTRACT:
The present invention relates to elasticised materials and more particularly elasticised medical fabrics including adhesive bandaging material and traditional flat crepe non adhesive bandage material which provide strong support. The present invention also relates to processes for the manufacture of such materials.
Elastic adhesive bandages [EAB's] and Elastic bandages [EB's] are normally used to provide support for the treatment of sprains, strains, sports injuries, varicose veins and ulcers.
These bandages are required to have sufficient elasticity to enable them to conform to the body portion contour when applied to bandaged area and, when secured, to allow limited movement. EABs carry a layer of an adhesive such as a pressure sensitive adhesive, to permit the bandage to be fixed in place.
However a problem with conventional EAB's and EB's is that the fabrics stretch but do not recover well thus resulting in fatigue or loss of support during use. A proposed solution has been the inclusion of a percentage of elastomeric yarns in the fabric structure to aid recovery.
Bandages which use elastic and twisted inelastic yarns are know from CH-A637537 and DE-A-2706787.
The present invention seeks to overcome these disadvantages whilst also retaining the conventional EAB aesthetics ie ‘herringbone appearance’ by the employment of twisted inelastic yarns.
According to the present invention there is a woven fabric comprising warp and weft yarns characterised in that the warp yarns comprise a plurality of elasticised yarns and twisted inelastic yarns arranged such that the inelastic yarns are in pairs of like twist, with two elastic yarns between. Alternate pairs of inelastic yarn are of opposing direction of twist wherein the cross-sectional area of the inelastic yarn is greater than that of the elastic yarn.
According to one embodiment of the present invention there is provided an elastic bandaging material comprising a woven fabric comprising warp and weft yarns characterised in that the warp yarns are elastic yarns and inelastic yarns arranged such that on each side of the elastic yarn is an inelastic yarn, each inelastic yarn with an opposing twist, so that adjacent inelastic yarns are always of the same direction.
According to a second aspect of the present invention there is provided an elastic adhesive bandaging material comprising a woven fabric having a layer of an adhesive on one side thereof wherein the fabric comprises warp and weft yarns characterised in that the warp yarns comprise a plurality of elasticised yarns and twisted inelastic yarns arranged such that the inelastic yarns are in pairs of like twist, with two elastic yarns between. Alternate pairs of inelastic yarn are of opposing direction of twist.
According to a further embodiment of the second aspect of the present invention there is provided an elastic adhesive bandaging material comprising a woven fabric with a backside and a face side with an adhesive applied to the back side wherein the fabric comprises warp and weft yarns characterised in that the warp yarns are elastic yarns and inelastic yarns arranged such that on each side of the elastic yarns is an inelastic yarn, each inelastic yarn with an opposing twist, so that adjacent inelastic yarns are always of the same direction of twist.
Aptly the twisted inelastic yarns will have much larger cross-sectional area than the elasticised yarns. This will have the effect of burying the elasticised yarn within the fabric, by rolling of the twisted inelastic yarn over the elasticised yarn. The size of the cross-sectional area or thickness of the twisted yarn will be determined not only by the diameter of the filaments comprising the yarn but also by virtue of the bulking induced by the twisting of the yarn. Aptly, the thickness of the elasticised yarn will range from 40 to about 80 Decitex whereas in the case of cotton inelastic yarns the Cotton Count will aptly range from 48 to 12 and will most aptly be about 28.
The inelastic yarns will be imparted with a twist, suitably a light twist and will preferably have twist of from 4 to 16 turns/cm (10 to 40 turns per inch), more suitably about 8 turns/cm (20 turns per inch). The inelastic yarns are provided with either an S-twist or a Z-twist and these yarns will be aligned in the warp direction in the fabric such that immediately neighbouring inelastic yarns have the same twists. Suitable materials for use as the inelastic yarn may comprise natural materials such as cellulosic fibres, for example cotton, synthetic materials such as viscose or mixed fibres
As used herein the term the “elasticised” refers to fabric components which are capable of being extended on the application of a stretching force and, upon release of that force will revert to or nearly to their original length. Such materials are elastic by virtue of the properties of the materials forming the structure or by virtue of the physical construction of the component
The elasticised yarns for use in the present invention aptly have an elastically recoverable extension of from 50 to 120%, more suitably from 65 to 75% and typically about 69%.
One type of suitable yarn for use as the elasticised yarn may be that formed from crimped or twisted inelastic materials such as heat-set crimped Nylon or very highly twisted cotton fibres (for example having a Twist Factor of greater than 16). Such materials although not truly elastic in nature can be stretched and upon relaxation of the stretching force will return to their crimped or highly twisted state.
Another and preferred type of elasticised yarns are those formed from elastomers such as polyurethane, natural rubber or synthetic rubbers such as neoprene and chloroprene. Such elastomer based yarns may be mono- or multi-filamentary in nature and may be wrapped with an inelastic yarn to limit the extensibilty of the elastomeric component of the prior to lock-out. A preferred elasticised yarn is a nylon wrapped polyurethane yarn sold by DuPont under the trade mark LYCRA. Such wrapped yarns may be singly or doubly wrapped. A suitable wrapped yarn for the purpose of this invention is a single wrapped yarn wrapped with from 680 to 750 turns per meter of a synthetic or natural fibre yarn. Typically such wrapped yarns have about 715 turns of wrapping yarn.
The desired ratio and relationship both among and between the elasticised and inelastic yarns can selected and maintained by the adoption of an appropriate denting arrangement in the front reed of the loom from which the fabric is woven.
The elasticised and inelastic yarns may be arranged such that that each twisted inelastic yarn lies immediately adjacent an elasticised yarn and such that the inelastic yarns in the same dent have opposing twists. One suitable arrangement of yarns in dent consists of four yarns, two inelastic and two elasticised yarns in which the two elasticised yarns lie immediately adjacent to each other and each has an associated twisted inelastic yarn. The inelastic yarns have S- and Z-twists respectively. In an alternative arrangement the dent arrangement consists of three yarns, a single elasticised yarn and two inelastic yarns, having S- and Z-twists respectively. In each instance each inelastic yarn is paired with an inelastic yarn, in the adjacent dent, having a like twist.
The weft yarns for use in the fabrics of the present invention may comprise yarns conventionally used for the weft of elasticised fabrics such as EABs and EBs. One such material suitable for use in the invention is cotton.
The fabrics of the invention are elastic in nature and may be used in those conventional garment and bandaging applications requiring the use of elasticised fabrics.
Thus in accordance with the invention there is provided a medical bandage comprising a woven fabric having warp and weft yarns characterised in that the warp yarns comprise a plurality of elasticised yarns and twisted inelastic yarns arranged such that the inelastic yarns are in pairs of like twist, with at least one elasticised yarn therebetween an
Blackburn John
Roberts Joanne Carol
Larson & Taylor PLC
Lewis Kim M.
Smith & Nephew plc
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