Nokia Corporation

Btg International Limited

William John Jenkins

Anthony David Harman

David Dakin Iorwerth Wright

Nikki Robinson

Garry Hodges

Geoffrey Dillwyn Moggridge

Hugh Van Liew

Adil Kadar

Richard Kybett

Mahmoud Darvish-Zadeh

Ahmad Khanifar

David DI Wright

A foam for the treatment of varicose veins is disclosed, comprising a sclersosant solution, e.g. polidocanol, foamed with a gas mixture which includes greater than 41% of a lipid soluble gas such as xenon. The aim is to provide a foam which may be injected into a varicose vein in large quantities because the gas component is dissipated quickly after the foam has acted on the varicose vein.

Therapeutic foam

A therapeutic foam for the treatment of, inter alia, varicose veins comprises a sclerosing solution foamed with a physiological gas such as carbon dioxide, oxygen or a mixture thereof. The foam has a nitrogen content of less than 0.8%. It may be generated using a pressurized canister system incorporating a fine mesh of micron dimensions through which the gas and sclerosing liquid are passed to make the foam. Alternatively, the foam may be generated by passing gas and solution between two syringes through a fine mesh. Techniques are described for minimizing the amount of nitrogen in a canister or syringe based product. A technique for generating and delivering foam simultaneously using a syringe based device is also disclosed.

The present invention relates to a method and circuit arrangement for performing signal alignment, wherein signals to be aligned are controlled based on a frequency response of a phase error determined in the comparison. Thereby, the input and output signals can be aligned even in the presence of considerable distortion, as they are now compared using a quantity immune to the effects of both amplitude-based and phase-based distortions.

Phase-error based signal alignment

The present invention relates to a method of linearization an amplifier () and also to amplifier circuitry. The method comprises the steps of generating a linearization signal () that substantially corresponds to low-frequency components of the square of an input signal () to the amplifier (), processing the linearization signal, combining () the linearization signal with the input signal to form a modified input signal, and amplifying the modified input signal by means of the amplifier ().

Linearization of an amplifier

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William John Jenkins