Method and apparatus for performing intra-operative angiography

A - Human Necessities – 61 – B

Patent

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Details

A61B 6/00 (2006.01) A61B 1/00 (2006.01) A61B 1/015 (2006.01) A61B 5/026 (2006.01) A61B 5/0275 (2006.01)

Patent

CA 2339214

Method for assessing the patency of a patient's blood vessel, advantageously during or after treatment of that vessel by an invasive procedure, comprising administering a fluorescent dye to the patient; obtaining at least one angiographic image of the vessel portion; and evaluating the at least one angiographic image to assess the potency of the vessel portion. ether related methods are contemplated, including methods for assessing perfusion in selected body tissue, methods for evaluating the potential of vessels for use in creation of AV fistulas, methods for determining the diameter of a vessel, and methods for locating a vessel located below the surface of a tissue.

Selon l'invention, le dispositif comprend un laser (1) destiné à exciter l'agent d'imagerie par fluorescence qui émet des rayonnements à une longueur d'onde provoquant l'émission de rayonnements à une longueur d'onde particulière par tout agent situé à l'intérieur du système vasculaire ou dans un tissu à étudier (3) ainsi irradié. Une caméra conçue pour fournir des images multiples au cours d'une période de temps, telle qu'une caméra CCD (2), peut être utilisée avantageusement pour capter les émissions de l'agent d'imagerie. Un filtre passe-bande (6) empêche la détection des autres rayonnements que ceux émis par l'agent d'imagerie. Un capteur de distance (9) comprend un afficheur visuel (9a) qui fournit une rétroaction indiquant au médecin que le laser est situé une distance optimale par rapport aux vaisseaux à étudier permettant la saisie d'images de bonnes qualité.

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