| 摘要 |
A needle containing medical device is provided with a mechanism to enable the needle to be sucked back into the main body of the device after use. The medical device contains a chamber that can be depressurised on demand to create the vacuum prior to use to enable the needle to be sucked back into the main body. Thus, the medical device can be stored and transported with the chamber under ordinary (atmospheric) pressure and the vacuum can be created on demand and just before use. Advantage-the medical device is not constantly under vacuum so the problem of slow loss of vacuum during storage is overcome.
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