A device (4; 52) for securing an elongated element on the body of a patient, the elongated element being intended to be partly inserted into the body of the patient, the device including: - a support for retaining the elongated element, including at least one lower wall intended to be placed between the elongated element and the body of the patient - an adhesive strip bearing the retaining support, and intended to be applied on the skin of the patient, the adhesive strip defining at least one shifted region of the attachment device with respect to the lower wall intended to adhere to the skin of the patient at least one region of the attachment device located under the lower wall along an axis (A-A') for inserting the elongated element into the retaining support is intended to be non-adherent to the skin of the patient when the attachment device is secured onto the skin of the patient, the retaining support comprising a clasping flap able to be maneuvered with respect to the lower wall between an open position and a clasping position of the elongated element, in which the elongated element is intended to be maintained between the lower wall and the clasping flap, characterized in that the entire region of the attachment device located under the lower wall of the retaining support is intended to be non-adherent to the skin of the patient. - a support for retaining the elongated element, including at least one lower wall intended to be placed between the elongated element and the body of the patient - an adhesive strip bearing the retaining support, and intended to be applied on the skin of the patient, the adhesive strip defining at least one shifted region of the attachment device with respect to the lower wall intended to adhere to the skin of the patient at least one region of the attachment device located under the lower wall along an axis (A-A') for inserting the elongated element into the retaining support is intended to be non-adherent to the skin of the patient when the attachment device is secured onto the skin of the patient, the retaining support comprising a clasping flap able to be maneuvered with respect to the lower wall between an open position and a clasping position of the elongated element, in which the elongated element is intended to be maintained between the lower wall and the clasping flap, characterized in that the entire region of the attachment device located under the lower wall of the retaining support is intended to be non-adherent to the skin of the patient. at least one region of the attachment device located under the lower wall along an axis (A-A') for inserting the elongated element into the retaining support is intended to be non-adherent to the skin of the patient when the attachment device is secured onto the skin of the patient, the retaining support comprising a clasping flap able to be maneuvered with respect to the lower wall between an open position and a clasping position of the elongated element, in which the elongated element is intended to be maintained between the lower wall and the clasping flap, characterized in that the entire region of the attachment device located under the lower wall of the retaining support is intended to be non-adherent to the skin of the patient.