| 摘要 |
A drug dispenser (1) has a hollow body (2) with a housing (6) for a pressurised can (7) containing a drug and its propellant arranged on top of the body. The can has an outlet stem (8) received in a socket (9) in an internal spigot (10). This has a junction with a flexible tube (11), leading to a kink valve pair (12, 14). The tube continues on to a second internal spigot (15), having a spray nozzle (16) just within a breathing opening (5). The kink valve pair (12, 14) is formed as a moulding of the tube, with side wings (17). Towards the ends of the wings, they have thinner portions (17.1) at which there are apertures (18) immediately adjacent the tube. The arrangement, which is similar to that in my International Application No. PCT/GB01/03313, defines positions at which the tube kinks to close its through bore (19). The thinner portions are provided in two positions, which provide the two kink valves. An intermediate section (20) of the tube, with a predetermined volume is provided between the kink valves. At the intermediate section, the tube (11) is clipped to flap (21), pivoted at its end (22) to the side wall of the body. As a patient breathes through the device, the flap is moved by the action of the breath on it. Specifically, as the patient inhales, the flap moves towards the breathing opening and as the patient exhales the flap moves towards the ambient opening. The flap has clearance with the passage such that it does not significantly obstruct the air passage, but at the same time the inhalation and exhalation positively moves the flap. The kink valve pair moves with the flap. |
