Barometric pressure correction based on remote sources of information
The invention includes systems and methods for converting absolute pressure data acquired in anatomical environments to gauge pressure data using an implant configured to monitor pressure. The implant is configured to communicate with an external controller, which is configured to communicate with a remote microprocessor that includes real-time barometric pressure data for one or more geographic locations.
1. A system for determining gauge pressure within a patient's body, comprising:
an implantable medical device including at least one sensor configured to sense absolute pressure at a location within the body;
an acoustic transducer operable to wirelessly transmit absolute pressure information to at least one device located inside or outside of the body, the absolute pressure information including an absolute pressure value corresponding to the absolute pressure sensed by the implantable medical device;
a switch coupled between the acoustic transducer and an energy storage device, the energy storage device adapted to supply operating current to an electrical circuit within the implantable medical device upon the acoustic transducer receiving an acoustic wake-up signal from an acoustic energy source, the switch configured to actuate the implantable medical device between an inactive state, in which the operating current is limited from flowing from the energy storage device to the electrical circuit, and an active state that allows operating current to flow from the energy storage device to the electrical circuit; and
a remote device operable to:
receive the absolute pressure value; and
calculate a gauge pressure value based at least in part on the absolute pressure value.
2. The system of claim 1 , wherein the remote device is further configured to calculate the gauge pressure value based on position data corresponding to a geographic location of the patient's body.
3. The system of claim 2 , wherein the gauge pressure value is derived from the barometric pressure at the geographic location of the body.
4. The system of claim 2 , wherein the position data includes altitude data from an altimeter.
5. The system of claim 2 , wherein the position data includes data from a GPS unit.
6. The system of claim 2 , wherein the position data includes a telephone number or zip code.
7. The system of claim 1 , wherein the acoustic transducer is a part of the implantable medical device.
8. The system of claim 1 , wherein the acoustic transducer is a separate component from the implantable medical device.
9. The system of claim 1 , wherein the at least one sensor includes a pressure sensor.
10. The system of claim 1 , wherein the implantable medical device is a biosensor.
11. The system of claim 1 , wherein the remote device is an external monitor.
12. The system of claim 1 , wherein the implantable medical device includes an internal controller configured to receive the gauge pressure value.
13. A method for measuring gauge pressure in a patient's body, comprising:
transmitting an acoustic wake-up signal to an implantable medical device located within the body, the implantable medical device including an acoustic transducer and a switch coupled between the acoustic transducer and an energy storage device, the energy storage device adapted to supply operating current to an electrical circuit within the implantable medical device, the acoustic wake-up signal configured to activate the switch to actuate the implantable medical device from an inactive state, in which operating current is limited from flowing from the energy storage device to the electrical circuit, to an active state that allows operating current to flow from the energy storage device to the electrical circuit;
sensing an absolute pressure value within the body and transmitting a wireless signal containing the sensed absolute pressure value to a remote device; and
calculating a gauge pressure value based at least in part on the sensed absolute pressure value.
14. The method of claim 13 , wherein the absolute pressure value is sensed by the implantable medical device.
15. The method of claim 13 , wherein the absolute pressure value is sensed by one or more sensors operatively coupled to the implantable medical device.
16. The method of claim 13 , further comprising transmitting the calculated gauge pressure to the implantable medical device.
17. The method of claim 16 , wherein the implantable medical device is configured to provide therapy to the patient based at least in part on the calculated gauge pressure value.
18. The method of claim 13 , wherein calculating a gauge pressure value is further based on position data corresponding to a geographic location of the patient's body.