Abstract: The present invention provides a training device for training a user to use a pressurised metered dose inhaler (PMDI). The device comprises a body, air expulsion means (e.g. bellows) for expelling air along an air flow path and an actuator for actuation of the air expulsion means. The air flow path comprises a restriction such that upon expulsion of air along the air flow path, an audible signal is generated. The audible signal mimics that generated during use of a PMDI.

Abstract: The present invention provides a training device for training a user to use a pressurised metered dose inhaler (PMDI). The device comprises a body, air expulsion means (e.g. bellows) for expelling air along an air flow path and an actuator for actuation of the air expulsion means. The air flow path comprises a restriction such that upon expulsion of air along the air flow path, an audible signal is generated. The audible signal mimics that generated during use of a PMDI.

Abstract: In a meter for assessing ventilatory capacity, a piston is free of any sliding contact with the body of the meter except over a region which extends axially not less than about 25% of the piston's diameter. In this way, tilting of the piston is avoided. Sliding contact is further reduced by the piston or wall having contact ribs extending axially.

Abstract: In a meter for assessing ventilatory capacity, the piston is free of any sliding contact with the body of the meter except over a region which extends axially not less than about 25% of the piston's diameter. In this way, tilting of the piston is avoided. Sliding contact is further reduced by the piston or wall having contact ribs extending axially.

Abstract: An inhalatory flow meter with a restriction flow meter with a restriction device located in the air flow path through the meter for increasing the resistance to flow through the meter. The restriction device may be removable or adjustable or capable of being rendered inoperative. A plurality of alternative restriction devices may be used interchangeably with the inhalatory flow meter, each having a predetermined pressure:flow rate characteristic. Also provided is a method of testing the performance of a subject in relation to the use of an inhalatory dispensing device for the introduction of a substance to the airways of the subject. In the method an inspiratory flow meter is provided with a predetermined flow restriction to provide a comparison with the resistance of the inhalatory dispensing device in use.