A catheter mount usable for spraying a substance in a ventilation circuit comprising means for sending a ventilation flow and means for the connection to a patient; said catheter mount wherein: - the catheter mount comprises a larger cross-section portion interposed between said means for sending the ventilation flow and said means for the connection to a patient, - said larger cross-section portion being provided with a proximal joint for the upstream connection to said means for sending a ventilation flow and a distal joint (21, 34) for the downstream connection to said means for the connection to a patient respectively, - said proximal joint being provided with a port suitable for fixing a connection means for reversibly connecting a container of substances apt to be sprayed, - the catheter mount further comprising said connection means, - said connecting means comprises a tubular introducer body, - said tubular body can pass through the port and is provided with an internal channel provided with an input matchable with said container and an output disposed in an area which is inside the proximal joint when the tubular body is inserted within the proximal joint; - said tubular body is further provided with ends having edges (53, 54) sized so they do not pass through said port, - the connection means further comprising a spring fitted on said tubular body. - the catheter mount comprises a larger cross-section portion interposed between said means for sending the ventilation flow and said means for the connection to a patient, - said larger cross-section portion being provided with a proximal joint for the upstream connection to said means for sending a ventilation flow and a distal joint (21, 34) for the downstream connection to said means for the connection to a patient respectively, - said proximal joint being provided with a port suitable for fixing a connection means for reversibly connecting a container of substances apt to be sprayed, - said larger cross-section portion being provided with a proximal joint for the upstream connection to said means for sending a ventilation flow and a distal joint (21, 34) for the downstream connection to said means for the connection to a patient respectively, - said proximal joint being provided with a port suitable for fixing a connection means for reversibly connecting a container of substances apt to be sprayed, - the catheter mount further comprising said connection means, - said connecting means comprises a tubular introducer body, - said tubular body can pass through the port and is provided with an internal channel provided with an input matchable with said container and an output disposed in an area which is inside the proximal joint when the tubular body is inserted within the proximal joint; - said tubular body is further provided with ends having edges (53, 54) sized so they do not pass through said port, - the connection means further comprising a spring fitted on said tubular body. - said tubular body can pass through the port and is provided with an internal channel provided with an input matchable with said container and an output disposed in an area which is inside the proximal joint when the tubular body is inserted within the proximal joint; - said tubular body is further provided with ends having edges (53, 54) sized so they do not pass through said port, - the connection means further comprising a spring fitted on said tubular body.