| 摘要 |
The useful life of a device needs to be limited, where hygienic, medical or technical grounds exist. A device which cannot be influenced by the user is thus required, which reliably, effectively and terminally prevents the further use of the device, as soon as the given number of operations is achieved. A locking device with spring operation and a counter is provided on the device and housed in a two-piece housing, the both parts of which are mounted such as to rotate relative to each other and the above can be blocked by a pre-tensioned leaf spring. The leaf spring is originally housed in a recess in the wall of the one housing piece. As soon as the permitted number of operations is achieved, a pin extends the leaf spring from the rest position thereof. The leaf spring then extends into a recess in the wall of the other housing piece such that the both housing pieces can no longer be rotated relative to each other. The pin can be located within the display of the counter. The blocking device can only be overcome with a force great enough to destroy the device. The device is suitable for blocking a high-pressure nebuliser or a needleless injector, by means of which a fluid is atomised to give an aerosol or a fluid is injected into a biological tissue.
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