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1. WO1998052466 - NON-INVASIVE SENSING OF A PHYSICAL PARAMETER

Примечание: Текст, основанный на автоматизированных процессах оптического распознавания знаков. Для юридических целей просьба использовать вариант в формате PDF

Claims
We claim:
1. A method for sensing a physical parameter within the body of a patient, comprising:
associating a first magnet with a tissue substrate within the body of the patient, wherein the first magnet generates a first magnet field;
positioning a second magnet at an initial orientation with, and in close proximity to, the first magnet such that a change in the physical parameter alters the initial orientation between the first magnet and second magnet, wherein the second magnet generates a second magnetic field and the sum of the first and second magnetic fields yields an initial combined magnetic field;
measuring the initial combined magnetic field; and
monitoring the combined magnetic field over a period of time to sense a change in the physical parameter.

2. The method of claim 1 wherein the tissue substrate is bone and the second magnet is associated with an orthotic device.

3. The method of claim 2 wherein the physical parameter is movement between the bone and orthotic device.

4. The method of claim 1 wherein a change in the physical parameter alters the initial orientation between the first magnet and second magnet such that the initial combined magnetic field is increased in strength over time.

5. The method of claim 1 wherein a change in the physical parameter alters the initial orientation between the first magnet and second magnet such that the initial combined magnetic field is decreased in strength over time.

6. The method of claim 1 wherein a change in the physical parameter alters the initial orientation between the first magnet and second magnet such that the initial combined magnetic field is changed with regard to orientation of the same over time.

7. A method for sensing a physical parameter within the body of a patient, comprising:
associating a first magnet with a device implanted within the body of the patient, wherein the first magnet generates a first magnet field;
positioning a second magnet at an initial orientation with, and in close proximity to, the first magnet such that a change in the physical parameter alters the initial orientation between the first magnet and second magnet, wherein the second magnet generates a second magnetic field and the sum of the first and second magnetic fields yields an initial combined magnetic field;
measuring the initial combined magnetic field; and
monitoring the combined magnetic field over a period of time to sense a change in the physical parameter.

8. The method of claim 7 wherein the device implanted into the body of the patient is selected from catheters, tubes, surgical staples, tissue joining devices, shunts, stents, artificial valves, artificial vessels, esophagus, trachea, tags and markers.

9. The method of claim 7 wherein the physical parameter is selected from strain, pressure, force, impact, volume, temperature, rotation, displacement, flow rate, oscillation frequency and damping coefficient.

10. The method of claim 7 wherein a change in the physical parameter alters the initial orientation between the first magnet and second magnet such that the initial combined magnetic field is increased in strength over time.

11. The method of claim 7 wherein a change in the physical parameter alters the initial orientation between the first magnet and second magnet such that the initial combined magnetic field is decreased in strength over time.

12. The method of claim 7 wherein a change in the physical parameter alters the initial orientation between the first magnet and second magnet such that the initial combined magnetic field is changed with regard to orientation of the same over time.

13. A magnetically -based sensing device for sensing a physical parameter within the body of a patient, comprising:
a first magnet which generates a first magnetic field; and
a second magnet in initial orientation with, and in close proximity to, the first magnet, such that a change in the physical parameter alters the initial orientation between the first magnet and second magnet wherein the second magnet generates a second magnetic field and the sum of the first and second magnetic fields yields an initial combined magnetic field.

14. An implantable device comprising the magnetically-based sensing device of claim 13.

15. The implantable device of claim 14 wherein the device is selected from catheters, tubes, surgical staples, tissue joining devices, shunts, stents, artificial valves, artificial vessels, esophagus, trachea, tags and markers.

16. The method of claim 13 wherein the physical parameter is selected from strain, pressure, force, impact, volume, temperature, rotation, displacement, flow rate, oscillation frequency and damping coefficient.