Claims for Patent: 6,915,154

Summary for Patent: 6,915,154

Title:	Method and apparatus for performing intra-operative angiography
Abstract:	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 patency of the vessel portion. Other 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.
Inventor(s):	Docherty; John C. (Winnipeg, CA), Hewko; Mark (Winnipeg, CA), Mangat; Gurpreet (Richmond Hill, CA), Flower; Robert W. (Hunt Valley, MD), Chari; Seshadri M. (Toronto, CA)
Assignee:	National Research Council of Canada (Ontario, CA)
Application Number:	09/744,034
Patent Claims:	1. A method for visualizing, during an invasive surgical procedure on an animal, at least a portion of at least one blood vessel of the animal that is exposed by the procedure, the method comprising: (a) administering a fluorescent dye to the animal; (b) obtaining at least one angiographic image of the at least one blood vessel portion; and (c) evaluating the at least one anglographic image to determine patency of the at least one blood vessel portion. wherein the at least one blood vessel is a coronary artery, wherein the at least one blood vessel portion is a bypass graft. 2. The method of claim 1, wherein step (b) is performed while the animal's heart is beating. 3. The method of claim 1, wherein a plurality of images of the vessel portion are obtained during the invasive procedure in which the bypass graft is created in the vessel portion, and wherein a first angiographic image of the vessel portion is obtained prior to creation of the bypass graft and a second anglographic image of the vessel portion is obtained after the bypass graft is created. 4. The method of claim 3, wherein the first and second anglographic images are obtained while the heart is beating. 5. The method of claim 1, wherein the fluorescent dye is selected from the group consisting of tricarbocyanine dyes, and mixtures thereof. 6. The method of claim 5, wherein the fluorescent dye is ICG. 7. The method of claim 1, wherein a plurality of angiographic images is obtained during step (b). 8. The method of claim 7 further comprising displaying the plurality of angiographic images on a video monitor. 9. The method according to claim 8, wherein the plurality of angiographic images is obtained using a CCD camera. 10. The method of claim 9 further comprising storing the plurality of anglographic images on a recordable medium. 11. The method according to claim 10, wherein the plurality of images is obtained at least in part using an endoscope.