This work is part of the study which was made by Maeda (Dissertação de EEUSP 1988 - Essay for M.A. - 1988), in six public hospital of the Secretaria de Estado da Saúde de São Paulo. A specific form was used as an instrument to collect data, only one question of which having been computed for the present study. The form was applied to 75 nurses. The people interviewed showed to have enough knowledge of the quality criterea of the "butterfley needle" and "infusion set" to subsidize the purchase