| 摘要 |
An implantable medical device for delivering therapeutic substance including a housing and a volume sensor assembly. The housing includes a stationary wall and maintains a reservoir containing the therapeutic substance and including a base wall movable relative to the stationary wall such that reservoir volume is a function of base wall/stationary wall spacing. The volume sensor assembly includes a cap, a shaft, a target, and circuitry. The cap defines a passage extending from an open end, and is mounted to the stationary wall such that the open end is open relative to a stationary wall inner face. The shaft has a first end attached to the base wall and a second end maintaining the target otherwise movably arranged within the passage. The circuitry generates information indicative of a longitudinal position of the target relative to the cap, and thus of the reservoir volume.
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