| 摘要 |
A barometric pressure sensor (260) for deriving reference pressure data for use in combination with absolute pressure data derived by an implantable medical device (IMD) is disclosed. The barometric pressure sensor (260) is located in a sensing module (200) having a module housing (222) enclosing an air chamber (230) which encloses the barometric pressure sensor (260). An air vent (220) extends through the module housing (222) for venting the air chamber (230) to atmospheric pressure outside the housing. A protective vent cover (240) extends across the air vent (220) formed of a material capable of air passage and capable of inhibiting passage of moisture, liquids, and particulate contaminants into the air chamber (230). The sensing module (200) is worn or carried by the patient and includes operating circuitry and a power supply for periodically storing sensed atmospheric pressure values as reference pressure data. In another embodiment, the sensing module (200) comprises a percutaneous access device (300) which is adapted to be implanted in the skin and subcutaneous tissue layer of the patient.
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