Devices and methods for coronary sinus pressure relief
A method and devices for relieving pressure in the left atrium of a patient's heart is disclosed. The method includes using an ablative catheter in a minimally invasive procedure to prepare an opening from the coronary sinus into a left atrium of the patient's heart. Once the opening is prepared, the opening may be enlarged by a technique such as expanding a balloon within the opening. A stent is then placed within the coronary sinus of the patient, with a transverse portion expanding within the opening, allowing blood to flow from the left atrium to the coronary sinus and then to the right atrium. Pressure within the left atrium is thus relieved.
1. A method for relieving intracardial pressure, the method comprising:
advancing a catheter into a coronary sinus;
delivering a stent through the catheter to an opening between the coronary sinus and a left atrium;
deploying the stent through the opening to place a first portion of the stent in the left atrium, a second portion of the stent in the opening, and a third portion of the stent in the coronary sinus; and
permitting blood to flow from the left atrium into the coronary sinus, with the coronary sinus emptying into the right atrium.
2. The method of claim 1 , wherein the first portion of the stent comprises a plurality of flanges, the deploying step comprising extending the plurality of flanges from the opening along a wall of the left atrium.
3. The method of claim 2 , wherein the extending step comprises extending the plurality of flanges 2-4 mm in a direction parallel to the coronary sinus.
4. The method of claim 2 , wherein the extending step comprises extending the plurality of flanges 1-2 mm in a direction parallel to the coronary sinus.
5. The method of claim 1 , further comprising extending the third portion of the stent from the opening along the coronary sinus.
6. A method for relieving elevated pressure in a left atrium of a patient's heart, the method comprising:
percutaneously placing a bending catheter inside a coronary sinus with its distal tip facing a placement location inside the coronary sinus,
penetrating the wall between the left atrium and the coronary sinus at the placement location from inside the coronary sinus and thereby creating an opening;
delivering an expandable device through a catheter to the coronary sinus of the patient's heart;
expanding a first portion of the device within the coronary sinus to bear against the coronary sinus and hold the device in place;
extending a second portion of the device through the opening in the wall between the coronary sinus and the left atrium to provide a blood flow path from the left atrium into the coronary sinus, the device comprising a flange at a distal end of the second portion, the extending step comprising extending the flange within the left atrium; and
maintaining regular blood flow inside the coronary sinus through the first portion of the stent while allowing blood to flow from the left atrium into the coronary sinus,
wherein the second portion is strong enough to maintain the patency of the opening and allow flow therethrough, and wherein an end of the second portion is joined around its circumference to a portion of the first portion.
7. The method of claim 6 , wherein the step of extending the flange comprises extending the flange 1-4 mm is a direction parallel to the coronary sinus.
8. The method of claim 6 , wherein the flange comprises a plurality of struts, the step of extending the flange comprising extending the struts within the left atrium.
9. A method for relieving intracardial pressure, the method comprising:
percutaneously placing a bending catheter inside a coronary sinus with its distal tip facing a placement location inside the coronary sinus;
penetrating a wall between a left atrium and the coronary sinus at the placement location from inside the coronary sinus, thereby creating an opening;
deploying a distal portion of a long portion of a stent inside the coronary sinus distal to the opening;
deploying a crown portion of the stent at the opening between the coronary sinus and the left atrium, wherein the crown portion is strong enough to maintain the patency of the opening and allow blood flow therethrough, and wherein an end of the crown portion is joined around its circumference to a portion of the long portion;
engaging a wall of the atrium with a flange of the stent;
deploying a proximal portion of the long portion of the stent inside the coronary sinus proximal to the opening;
maintaining regular blood flow inside the coronary sinus through the long portion of the stent; and
allowing blood to flow from the left atrium into the coronary sinus, thus relieving pressure.
10. The method of claim 9 , further comprising engaging an inner surface of the coronary sinus using a close fit between the long portion of the stent and the coronary sinus.