EXPANDABLE CARDIAC SHUNT

摘要

Disclosed are cardiac shunts and method of delivery, and in particular, to a shunt to reduce elevated left atrial pressure (LAP). The methods include forming a puncture hole between the left atrium and the coronary sinus, widening the puncture hole, and placing an expandable shunt within the widened puncture hole. A first catheter having a side-extending needle may be used to form a puncture into the left atrium. A second catheter extends along a guidewire and an expandable shunt with distal and proximal flanges is expelled therefrom into the puncture. The shunt defines a blood flow passage therethrough that permits shunting of blood from the left atrium to the coronary sinus when the LAP is elevated. The shunt is desirable formed of a super-elastic material and manipulated with control rods. The shunt defines a tilted flow tube that facilitates collapse into the catheter.

主权项

1. An expandable blood flow shunt formed of an elastic material and configured to be inserted into a puncture wound in a tissue wall between two anatomical chambers and expand from a collapsed state to an expanded state to maintain a blood flow opening therebetween, the tissue wall defining a reference plane generally perpendicular to the opening, the shunt comprising, in an expanded state:
a central flow tube defined by an opposed pair of lateral side walls formed by struts extending between an opposed pair of end walls formed by struts, the central flow tube defining a central axis therethrough angled from a reference axis extending perpendicular through the reference plane; two distal flanges formed by struts each attached to a first axial end of the central flow tube, the distal flanges extending away from one another in opposite longitudinal directions generally parallel to the reference plane; and two proximal flanges formed by struts each attached to a second axial end of the central flow tube opposite the first end, the proximal flanges extend away from one another in opposite longitudinal directions generally parallel to the reference plane, the proximal flanges extend in the same directions as the distal flanges such that each proximal flange parallels one of the distal flanges to form a clamping pair of flanges with a gap therebetween sized to clamp onto the tissue wall.