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Sonda perfeccionada, caracterizada por comprender una cánula de material moldeable transparente y flexible en cuyo extremo inferior se han previsto, insertadas en el material, una o varias esferas pesadas de diámetro conveniente para facilitar el descenso de dicha extremidad habiéndose previsto el extremo exteriormente redondeado así como los bordes de los orificios practicados disponiendo en el extremo opuesto, un ensanchamiento para la conexión de una fuente de succión eliminando racores separados.