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 the distal end;
an expansion frame attached to the cannula which is expandable between a compressed state and a radially expanded state;
a mesh having a first edge attached circumferentially and continuously to the expansion frame; and
an elastomeric strip attached circumferentially and continuously to the first edge of the mesh, said strip providing a compliant edge adapted to seal against the inner lumen of the aorta during use.
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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.
333 Citations
57 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 the distal end; an expansion frame attached to the cannula which is expandable between a compressed state and a radially expanded state; a mesh having a first edge attached circumferentially and continuously to the expansion frame; and an elastomeric strip attached circumferentially and continuously to the first edge of the mesh, said strip providing a compliant edge adapted to seal against the inner lumen of the aorta during use. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An arterial cannula with associated filter, comprising:
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a cannula having an outer surface, a distal end adapted to enter an artery, a proximal end adapted to receive blood from a bypass-oxygenator machine, and a lumen which extends longitudinally from the proximal end to the distal end; an expansion frame attached to the cannula which is expandable between a compressed state and a radially expanded state; a mesh having a first edge attached circumferentially and continuously to the expansion frame; and a sleeve which circumferentially encloses the mesh and expansion frame to minimize the profile of the mesh and expansion frame when in the compressed state, wherein said sleeve is operable to roll-up and thereby release the mesh and expansion frame for deployment to the radially expanded state. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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37. An arterial cannula with associated filter, comprising:
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a cannula having an outer surface, a distal end adapted to enter an artery, a proximal end adapted to receive blood from a bypass-oxygenator machine, and a lumen which extends longitudinally from the proximal to the distal end; an expansion frame attached to the cannula which is expandable between a compressed state and a radially expanded state; and a mesh having a first edge attached circumferentially and continuously to the expansion frame; wherein a segment of the cannula within the distal end is deformable and radially compresses to circumferentially receive a portion of the expansion frame to minimize the profile of the mesh and expansion frame when in the compressed state, wherein during use, the mesh and expansion frame are deployed to the expanded state, and the deformable segment of the cannula radially expands to transmit a full luminal volume of blood during bypass.
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Specification