The invention relates to a radially compressible and expandable rotor (13, 13a, 13b) to get a pump using at least one impeller blade (20, 22, 36, 36a, 36b, 36c, 36d, 36e, 36f, 36g, 37, 37a, 37b, 37c, 37d, 37e, 37f, 74, 88, 89, 90), wherein the impeller blade has an impeller blade body whose substance is elastically deformable as well as at least one stiffening strut (25, 26, 27, 30, 31, 32, 52, 53, 57, 58, 62, 63, 67, 95) that is at least partially embedded in the fabric of the impeller blade body. The struts were created suitably in size, shape and arrangement and are incorporated in suitable hollow spaces of the impeller blade body for stabilizing the impeller blade. Elements with tensile strength may likewise be provided.

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