Method of using a doppler catheter
Patent 4957111 Issued on September 18, 1990. Estimated Expiration Date: 
September 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCatheter for treating arterial occlusion Catheter apparatus, system and method for intravascular two-dimensional ultrasonography Acoustic image system and method Patent #: 4821731 InventorApplicationNo. 248777 filed on 09/23/1988US Classes:600/468, With blood flow measurement or detection600/465, Blood flow measurement604/915BALLOON CATHETERS [A61M 25/10]ExaminersPrimary: Jaworski, Francis J.Attorney, Agent or FirmInternational ClassA61B 008/12AbstractA steerable catheter having a Doppler crystal at the tip to measure the velocity of blood in vivo--and inferentially the blood flow. The catheter includes two passageways, one passageway being exposed to the blood stream with the other passageway containing the electrical leads to the Doppler crystal. The one passageway is dimensioned for receiving a wire guide for accurately manipulating the catheter. Preferably, the catheter incorporates an inflatable angio-balloon operable to distend the blood vessel in the region of a stenosis. Thus, blood flow can be determined in the region of the stenosis before and/or after the vessel is distended. The passageways are preferably defined by a pair of generally concentric tubes with the Doppler crystal doughnut-shaped and sealingly disposed at the tip of the catheter. | |
