| 摘要 |
The present invention includes substance delivery control system having a first conduit defining a lumen for the passage of a substance therethrough; a first delivery control element defining a first conduit state selection element; a second delivery control element defining a second conduit state selection element, where the alignment of the first and second conduit state selection elements places the conduit in a first state, and where misalignment of the first and second conduit state selection elements places the conduit in a second state. |
