Abstract: A device for delivering a substance in the form of aerosol is described. The device is used with a syringe equipped with a plunger and without a needle. The delivery device comprises: a connection sleeve for connecting the device with the syringe; a nozzle for delivering the substance as aerosol, preferably with troncoconical walls and obtained on an elongated outer body of the device; and a fluid-dynamic path comprised between the connection sleeve and the dispensing nozzle, wherein the path comprises an annular expansion chamber and an elongated acceleration chamber, so that, while in use, a manual actuation of the plunger introduces the substance into the fluid-dynamic path in a liquid form through the connection sleeve and produces the substance as aerosol through the dispensing nozzle.

Abstract: Application of a hearing aid alters the distribution of sound pressure at the tympanic membrane in the ear. Measurements of sound pressure of a free ear and with a hearing aid are performed to evaluate the alteration produced and the in situ frequency response of the hearing aid itself. The following steps are performed: calculating the REUG; calculating a magnitude; calculating one of two components and designing of the filter for the compensation for such component; calculating the REAG; calculating one of two components. The sum of two components is the Insertion Gain; designing the compensating filter of the POST component of the Insertion Gain; testing and verifying, on the subject wearing the hearing aid, the compensating filter of REIG, and possible refinement procedure to correct the compensation of the Insertion Gain obtained in the previous step; tuning the hearing aid for deafness taking into account the compensating filter.

Abstract: The application of a hearing aid alters the distribution of sound pressure at the tympanic membrane in the ear. Measurements of sound pressure of a free ear and with a hearing aid are performed in order to evaluate the alteration produced and the in situ frequency response of the hearing aid itself. The following steps are performed: (A) calculating the REUG (Real Ear Unaided Gain), that is, a comparison between a sound pressure measurement performed with a microphone positioned in the ear near the tympanic membrane and a sound pressure measurement performed with a reference microphone positioned on the face outside the ear; (B) calculating a magnitude (the so-called ALMIC), i.e.

Abstract: A device for delivering a substance in the form of aerosol is described. The device is used with a syringe equipped with a plunger and without a needle. The delivery device comprises: a connection sleeve for connecting the device with the syringe; a nozzle for delivering the substance as aerosol, preferably with troncoconical walls and obtained on an elongated outer body of the device; and a fluid-dynamic path comprised between the connection sleeve and the dispensing nozzle, wherein the path comprises an annular expansion chamber and an elongated acceleration chamber, so that, while in use, a manual actuation of the plunger introduces the substance into the fluid-dynamic path in a liquid form through the connection sleeve and produces the substance as aerosol through the dispensing nozzle.