Silane resinous orthopaedic casting and splinting materials

Details Silane resinous orthopaedic casting and splinting materials Silane resinous orthopaedic casting and splinting materials

1997-09-11

1999-07-20

Apley, Richard J.

Surgery: splint, brace, or bandage

Orthopedic bandage

Splint or brace

602 7, A61F 500

Patent

active

059250062

DESCRIPTION:

BRIEF SUMMARY
In particular this invention relates to casting and splinting materials based on synthetic resins which, upon contact with water will cross-link and harden to form a weight bearing support for a limb or body portion and to such resins which on contact with water will cross-link and harden.
Resin based splinting and casting materials find wide use in the immobilisation of limbs, for example the fixation of fractured bones, immobilisation of injured joints and for the support of ligaments and muscles where it is necessary to encase the limb in a partially or completely surrounding rigid form or cast.
There are several major considerations for a casting or splinting material. A suitable material should be easily handleable, with a reasonable setting time to allow sufficient time in the case of casting bandages to mould the bandage about the limb and it should be flexible and free of offensive chemicals which may affect the patient or practioner applying the material. In addition it is desirable that during the forming of the cast the material does not generate an uncomfortable exothermic reaction and that it sets within a relatively short time under mild conditions.
Splinting and casting materials comprising water activated synthetic polymers in which a cross-linkable prepolymer resin system is coated onto a suitable substrate are well known. The most favoured and commercially developed systems are those based on prepolymers which contain isocyanate functional groups and which in the presence of cold water will cross-link to form urea bridges. The resin systems usually also contain a catalyst to speed up the cross-linking reaction and so that a weight bearing cast may be formed in as shorter time as possible consistent with requirements for moulding and shaping the splint.
The isocyanate cross linking reaction is usually an exothermic reaction. In meeting the working requirements for such resin systems the resin chemistry has to be carefully controlled so as to allow the resins to cure in a period of time which is acceptably short and yet not cure under conditions in which so much heat is evolved that the applied cast is uncomfortable to the wearer.
A disadvantage of such systems is the relatively high exotherm generated on curing and that there is a perceived health hazard with the use of orthopaedic bandages comprising isocyanate functionalised prepolymers. It is thus desirable to make a suitable splinting materials without utilising isocyanate functionalised prepolymers and thus considerable care has to be taken in both the preparation of the splinting or casting material and in its use to ensure that all the isocyanate functionalities are fully reacted.
In U.S. Pat. No. 4,411,262 (von Bonin et al) there are disclosed splinting and casting materials comprising substrates impregnated or coated with a reactive one component system, wherein inter alia the system includes organic compounds with molecular weights greater than 10,000, comprising reactive groups which may be alkoxysilane groups. It is taught that the organic compounds themselves were produced by an isocyanate functionalised reaction and thus any perceived health risk associated with isocyanate functionalised resins is not entirely removed without ensuring that the resins are fully reacted.
U.S. Pat. No. 5,423,735 also describes materials of this type, where the water reactive resin is an alkoxysilane functionalised polyurethane/polyurea resin, produced by reacting isocyanate functionalised precursors. Such resins potentially have the same problems which may be associated with other prior resins produced from isocyanate functionalised precursors.
The present invention seeks to provide an improved orthopaedic casting bandage with a one component resin system which completly avoids the use of free isocyanate groups as the water activated reactive groups, thus eliminating any health hazard which may be associated with the use of materials containing free isocyanate groups.
Although the splinting and casting material of the present invention is descri

REFERENCES:
patent: 5540652 (1996-07-01), Callinan, et al.

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