Cannula with associated filter and methods of use during cardiac surgery
First Claim
Patent Images
1. An aortic cannula with associated filter, comprising:
- a cannula having an outer surface, a distal end adapted to enter the aorta, a proximal end adapted to receive blood from a bypass-oxygenator machine, and a lumen which extends longitudinally from the proximal end to a port at the distal end;
an expansion frame insertable through the cannula which is expandable between a compressed state and a radially expanded state, wherein the expansion frame is deployable distal to the port at the distal end of the cannula; and
a continuous mesh having a substantially circular edge attached circumferentially and continuously to the expansion frame, wherein the lumen of the cannula terminates proximal of a distal tip of the mesh.
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Abstract
Devices and methods for filtering blood. The devices generally comprise: a mesh for filtering blood flowing within a blood vessel, particularly within an artery such as the aorta; a structure adapted to open and close the mesh within the blood vessel; and a means to actuate the structure. The methods generally include the following steps: introducing a mesh into a blood vessel to entrap embolic material; adjusting the mesh, if necessary, during the course of filtration; and removing the mesh and the entrapped foreign matter from the blood vessel. Additionally, visualization techniques are used to ensure effective filtration.
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Citations
20 Claims
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1. An aortic cannula with associated filter, comprising:
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a cannula having an outer surface, a distal end adapted to enter the aorta, a proximal end adapted to receive blood from a bypass-oxygenator machine, and a lumen which extends longitudinally from the proximal end to a port at the distal end; an expansion frame insertable through the cannula which is expandable between a compressed state and a radially expanded state, wherein the expansion frame is deployable distal to the port at the distal end of the cannula; and a continuous mesh having a substantially circular edge attached circumferentially and continuously to the expansion frame, wherein the lumen of the cannula terminates proximal of a distal tip of the mesh. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for protecting a patient from embolization, comprising the steps of:
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providing a cannula having an outer surface, a distal end adapted to enter the aorta, a proximal end, a lumen which extends longitudinally from the proximal end to a port at the distal end, an expansion frame insertable through the cannula which is expandable between a compressed state and a radially expanded state, wherein the expansion frame is deployable distal to the port at the distal end of the cannula, and a continuous mesh having a substantially circular edge attached circumferentially and continuously to the expansion frame, wherein the lumen of the cannula terminates proximal of a distal tip of the mesh; introducing the cannula into the patient'"'"'s aorta; deploying the filter within the patient'"'"'s aorta; and removing the blood filter and cannula from the patient'"'"'s aorta. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification