Abstract: The invention relates to a linear compressor discharge valve. The valve comprises a valve body having a first layer of composite material, wherein the composite material of the first layer comprises polyaryletherketone and reinforcement filaments that are aligned with an axis of the first layer. The valve further comprises a second layer of composite material overlying the first layer of composite material. The composite material of the second layer comprises polyaryletherketone and reinforcement filaments that are aligned with an axis of the second layer. The axis of the second layer forms an angle of greater than 0 to less than 180° with the axis of the first layer.

Abstract: The invention relates to a composite material comprising polyaryletherketone, reinforcement fibre, and contrast agent. The reinforcement fibre is present in an amount of 52 to 58 volume % based on the total volume of the composite material.

Abstract: An IM nail is positioned within a medullary canal and secured in position by bone screws. The nail includes bores which engage insert assemblies and engage the screws. Each insert assembly is in two parts. Part includes a head and a narrower neck; and similarly, part includes a head and a narrower neck. A bore extends through the assembly from one side to the other. Part of the assembly is engaged with a nail by insertion into the nail via mouth; and part is engaged with the nail by insertion into the nail via mouth. When in position the parts abut one another and define bore which can receive screws. The nail is made from a polyetheretherketone (PEEK)/carbon fibre composite. Parts of the insert assemblies are produced separately from the nail. They may be produced by injection moulding a polymeric composition comprising PEEK and barium sulphate.