Fiber optic probe for temperature measurements in biological media
First Claim
1. Insertion probe for sensing distributed temperature comprising a tube containing at least one optical fiber being inscribed with at least one Bragg grating, the tube being sealed at its distal end, characterized in that the probe consists of materials having low magnetic susceptibility.
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Abstract
The invention relates to an insertion probe for sensing distributed temperature comprising a tube containing at least one optical fiber being inscribed with at least one Bragg grating, the tube being sealed at its distal end. The probe is characterized in that it consists of materials having low magnetic susceptibility. The invention also relates to the use of such a probe in cryosurgery to allow the use of magnetic resonance imaging.
47 Citations
29 Claims
- 1. Insertion probe for sensing distributed temperature comprising a tube containing at least one optical fiber being inscribed with at least one Bragg grating, the tube being sealed at its distal end, characterized in that the probe consists of materials having low magnetic susceptibility.
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21. A method of performing cryosurgery on a living body comprising the steps:
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inserting one or more insertion probes into said living body, said insertion probe(s) comprising a tube containing at least one optical fiber being inscribed with at least one Bragg grating, the tube being sealed at its distal end, and wherein said temperature insertion probe(s) consist(s) of materials having low magnetic susceptibility; and
sensing a distributed temperature of a part of said living body using said insertion probe(s). - View Dependent Claims (22, 25, 28)
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23. A cryosurgical system for treating a part of a living body, the system comprising:
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one or more cryo-applicators for cryosurgically cooling said part of said living body;
one or more temperature probes for insertion into said living body, said probe comprising a tube containing at least one optical fiber being inscribed with at least one Bragg grating, the tube being sealed at its distal end, and wherein said temperature probe(s) comprise(s) substantially materials having low magnetic susceptibility;
magnetic resonance imaging apparatus for imaging said part of said living body; and
a temperature display connected to said temperature probe(s) for displaying the temperature of said part of said living body or a surrounding part.
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24. A method for cryosurgically treating a part of a living body comprising the steps of:
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cooling a part of a living body;
measuring a temperature within said part of said living body or a surrounding part as said part is cooled, using one or more optical temperature probes having a low magnetic susceptibility;
imaging said part of said living body using magnetic resonance imaging;
thereby to monitor and control a degree of cooling applied to the part of the living body.
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26. A fiber optic probe for invasive medical use, comprising at least one optical fiber having one or more optical sensors enclosed within a protective tubular housing, the components of the probe each being formed of materials having a magnetic susceptibility less than about 300 ppm, preferably less than 200 ppm, more preferably less than about 100 ppm, more preferably less than about 50 ppm, and most preferably less than 10 ppm.
- 27. A fiber optic probe for invasive medical use, comprising at least one optical fiber having one or more optical sensors enclosed within a protective tubular housing, the components of the probe each being formed primarily of materials having a relatively low magnetic susceptibility and being provided with a marker of relative high magnetic susceptibility in the region of the or each optical sensor.
Specification