Implantable medical device for sensing absolute blood pressure and barometric pressure

A system for measuring barometric pressure and for measuring absolute pressure within a patient's body comprising:

• an implantable medical device for powering an absolute pressure sensor and a barometric pressure sensor and for processing barometric pressure signal values and absolute pressure signal values;
• an implantable absolute pressure sensor adapted to be located in a pressure measurement site of the patient's body coupled with said implantable medical device for deriving and providing absolute pressure signal values to said implantable medical device for processing;
• a barometric pressure sensor located in said implantable medical device for deriving and providing barometric pressure signal values to said implantable medical device for processing;
• and
• means for providing an air passage between said barometric pressure sensor and the atmosphere exterior to the patient's body for applying barometric pressure to said barometric pressure sensor.

A system for measuring barometric pressure and for measuring absolute pressure within a patient's body comprising:

• an implantable medical device for powering an absolute pressure sensor and a barometric pressure sensor and for processing barometric pressure signal values and absolute pressure signal values;
• an implantable absolute pressure sensor adapted to be located in a pressure measurement site of the patient's body coupled with said implantable medical device for deriving and providing absolute pressure signal values of fluctuations in a physiologic pressure to said implantable medical device for processing;
• a barometric pressure sensor located in said implantable medical device for deriving and providing barometric pressure signal values to said implantable medical device for processing;
• and
• means for providing an air passage between said barometric pressure sensor and the atmosphere exterior to the patient's body for applying barometric pressure to said barometric pressure sensor comprising:
• a percutaneous access device adapted to be implanted in the patient's skin having an air passageway therethrough;
• and
• means coupled between said percutaneous access device and said implantable medical device for applying atmospheric air pressure to said barometric pressure sensor.

An implantable medical device method for deriving relative physiologic signal value data for use by and/or storage within an implantable medical device implanted within a patient's body comprising the steps of:

• implanting an ambient state or condition monitoring device under the skin and subcutaneous tissue layer of the patient's body, and with the implanted ambient state or condition monitoring device,
• sensing an ambient state or condition outside the body affecting a sensed physiologic state or condition within the body;
• deriving a reference signal value from the sensed ambient state or condition;
• and
• conveying the reference signal value to the implantable medical device;
• implanting a physiologic state or condition monitoring device in relation with a body organ, and with physiologic state or condition monitoring device, sensing a physiologic state or condition within the body of the patient;
• deriving an absolute physiologic signal value from the sensed physiologic state or condition;
• and
• conveying the absolute physiologic signal value to the implantable medical device;
• and
• combining the conveyed absolute physiologic signal value and ambient signal value to derive a relative physiologic signal value therefrom.

An implantable system for deriving relative physiologic signal value data for use by and/or storage within an implantable medical device implanted within a patient's body comprising the steps of:

• an ambient state or condition monitoring device adapted to be implanted under the skin and subcutaneous tissue layer of the patient's body, the implanted ambient state or condition monitoring device further comprising,
• means for sensing an ambient state or condition outside the body affecting a sensed physiologic state or condition within the body;
• means for deriving a reference signal value from the sensed ambient state or condition;
• and
• means for conveying the reference signal value to the implantable medical device;
• a physiologic state or condition monitoring device adapted to be implanted in relation with a body organ, the physiologic state or condition monitoring device further comprising,
• means for sensing a physiologic state or condition within the body of the patient;
• means for deriving an absolute physiologic signal value from the sensed physiologic state or condition;
• and
• means for conveying the absolute physiologic signal value to the implantable medical device;
• and
• means in the implantable medical device for combining the conveyed absolute physiologic signal value and ambient signal value to derive a relative physiologic signal value therefrom.