Intra-cardiac left atrial and dual support systems
A system for treating atrial dysfunction, including heart failure and/or atrial fibrillation, that includes one or more pressurizing elements and control circuitry. The one or more pressurizing elements can comprise one or more balloons and can be configured to be positioned in the left atrium, and optionally the pulmonary artery, of a patient's heart. The one or more pressurizing elements can be coupled to one or more positioning structures that can be configured to position the one or more pressurizing elements in the left atrium, and optionally the pulmonary artery. The control circuitry can be configured to operate the one or more pressurizing elements to decrease or increase pressure and/or volume in the left atrium, and optionally the pulmonary artery, in accordance with different phases of the cardiac cycle. The control circuitry can be further configured to operate the one or more pressurizing elements to generate coordinated pressure modifications in the left atrium, and optionally the pulmonary artery.
1. A method for treating atrial dysfunction, comprising:
forming a trans-septal opening in a septum between a left atrium and a right atrium of a patient;
delivering a pressurizing element through the trans-septal opening and into the left atrium;
operating the pressurizing element to increase and decrease a pressure in the left atrium over multiple cardiac cycles;
removing the pressurizing element from the left atrium after the multiple cardiac cycles; and
after the pressurizing element is removed, leaving the trans-septal opening open between the left atrium and the right atrium.
2. The method of claim 1 , further comprising, after forming the trans-septal opening in the septum, delivering an atrial positioning structure into or through the trans-septal opening.
3. The method of claim 2 , wherein delivering the pressurizing element comprises delivering the pressurizing element through the atrial positioning structure.
4. The method of claim 2 , wherein leaving the trans-septal opening open comprises leaving the atrial positioning structure within the trans-septal opening.
5. The method of claim 4 , wherein the atrial positioning structure is configured to act as a shunt between the left atrium and the right atrium.
6. The method of claim 2 , wherein the atrial positioning structure comprises a trans-septal shaft.
7. The method of claim 1 , comprising operating the pressurizing element to decrease a pressure in the left atrium during atrial diastole to draw oxygenated blood out of the lungs of the patient.
8. The method of claim 1 , comprising operating the pressurizing element to increase the pressure in the left atrium during atrial systole.
9. The method of claim 8 , wherein the increase in the left atrial pressure during atrial systole increases a pressure differential between the left atrium and left ventricle.
10. The method of claim 1 , wherein the pressurizing element is a balloon.
11. A method for treating atrial dysfunction, comprising:
positioning a trans-septal shaft having an opening through a septum between a left atrium and a right atrium of a patient to provide for trans-septal access to the left atrium;
delivering a catheter carrying an inflatable balloon through the opening of the trans-septal shaft and into the left atrium;
operating the balloon to increase and decrease a pressure in the left atrium over multiple cardiac cycles;
removing the balloon catheter from the left atrium after the multiple cardiac cycles; and
after the catheter is removed, leaving the trans-septal shaft in position to provide a shunt path between the left atrium and the right atrium.
12. The method of claim 11 , further comprising delivering a pressure sensor through the opening of the trans-septal shaft to the left atrium.
13. The method of claim 11 , wherein the trans-septal shaft comprises an expandable atrial positioning structure configured to secure the trans-septal shaft relative to the left atrium.
14. The method of claim 11 , comprising operating the inflatable balloon to decrease a pressure in the left atrium during atrial diastole to draw oxygenated blood out of the lungs of the patient.
15. The method of claim 11 , comprising operating the inflatable balloon to increase the pressure in the left atrium during atrial systole.
16. The method of claim 15 , wherein the increase in the left atrial pressure during atrial systole increases a pressure differential between the left atrium and left ventricle.