Method and apparatus for determining neovascular flow through tissue in a vessel
First Claim
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1. Apparatus configured to guide a guide wire through body tissue, said apparatus comprising:
- a guide wire having a first proximal end and second distal end; and
at least one interferometric guidance system comprising;
a first optic fiber comprising a first end and a second end, said second end coupled to and extending beyond said guide wire distal end; and
a circuit for generating Doppler shift information relating to neovascular flow through the tissue by revealing relative changes in blood flow velocity at the said second end of said first optic fiber, said interferometric guidance system configured for generating interference information from body tissue.
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Abstract
Methods and apparatus for guiding a guide wire through a blood vessel are described. An exemplary embodiment includes a guide wire coupled to an interferometric guidance system. The interferometric guidance system is configured to provide imaging information of the vessel. The guidance system further includes a flow detection circuit for performing Doppler shift analysis to determine the presence of neovascular channels through an obstruction in the vessel. The neovascular fow information is used by the guide wire operator to guide the guide wire through the obstruction.
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Citations
18 Claims
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1. Apparatus configured to guide a guide wire through body tissue, said apparatus comprising:
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a guide wire having a first proximal end and second distal end; and
at least one interferometric guidance system comprising;
a first optic fiber comprising a first end and a second end, said second end coupled to and extending beyond said guide wire distal end; and
a circuit for generating Doppler shift information relating to neovascular flow through the tissue by revealing relative changes in blood flow velocity at the said second end of said first optic fiber, said interferometric guidance system configured for generating interference information from body tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for detecting neovascular flow through an obstruction in a blood vessel, said apparatus comprising:
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a guide wire having a first proximal end and second distal end;
at least one interferometric guidance system comprising a fiber coupled to and extending beyond said guide wire distal end;
an interferometric apparatus coupled to said guide wire proximal end and configured to receive data relating to neovascular flow from said fiber;
a broad band filter coupled to an output of said interferometric apparatus, said interferometric apparatus generating interferometric peaks of varying frequencies; and
a frequency-to-voltage converter coupled in series to said broad band filter. - View Dependent Claims (13)
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14. A method to determine neovascular flow through tissue in a vessel, said method comprising:
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using an apparatus configured to guide a guide wire through body tissue which comprises a guide wire having a first proximal end and second distal end, and at least one interferometric guidance system comprising at least one stationary optical fiber coupled to and extending beyond the guide wire distal end;
examining the vessel with the interferometric system; and
performing a Doppler shift analysis on frequencies of interference peaks generated by the interferometric system examining the vessel to determine the velocity of blood. - View Dependent Claims (15, 16, 17, 18)
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Specification