Abstract: An attachment device for a tracheostoma valve has a flexible layer structure having a stoma opening therein, and a circumferential flange attached to the flexible layer structure. The flexible layer structure has at least a layer portion that substantially has a funnel shape discharging into the stoma opening. A circumferential attachment area, where the flexible layer structure is attached to the circumferential flange, is situated at a distance from a circumferential edge of the stoma opening. Part of the funnel shape extends between the circumferential attachment area and the circumferential edge of the stoma opening.

Abstract: A tracheostoma valve (1) comprises a main air passage structure provided with a main valve arrangement. The tracheostoma valve is switchable in response to a spurt of inhalation air from a breathing condition into a speaking condition, while the tracheostoma valve is switchable in response to a spurt of exhalation air from said speaking condition into said breathing condition. The main valve arrangement comprises an at least partly flexible bistable wall portion which has a circumferential bordering edge. At least part of the bordering edge forms a hinging means around which the bistable wall portion is hingeable between a first stable position in which an orifice of the main air passage structure is being blocked, and a second stable position in which said orifice is released.

Abstract: A tracheostoma valve (1) comprises a main air passage structure provided with a main valve arrangement. The tracheostoma valve is switchable in response to a spurt of inhalation air from a breathing condition into a speaking condition, while the tracheostoma valve is switchable in response to a spurt of exhalation air from said speaking condition into said breathing condition. The main valve arrangement comprises an at least partly flexible bistable wall portion which has a circumferential bordering edge. At least part of the bordering edge forms a hinging means around which the bistable wall portion is hingeable between a first stable position in which an orifice of the main air passage structure is being blocked, and a second stable position in which said orifice is released.