Device for proactive modulation of cardiac strain patterns
A direct cardiac assist device which may aid in ventricular recovery. The device proactively modulates cardiac strain pattern to produce a contraction strain pattern that induces beneficial growth and remodeling of the myocardium or prevents or reduces apoptosis of the myocytes. The device may include an outer shell. membrane, or mesh and an inner membrane. The space between the outer member and the membrane may be filled with fluid that is pressurized during contraction. The device prescribes a beneficial strain pattern during heart contraction. This strain pattern does not invert the curvatures or grossly alter the curvatures of the heart and may assist in myocyte regrowth and healing of the failing heart.
1. A direct cardiac compression device adapted to surround the heart and comprising
a compression means comprising an outer member and at least one inner membrane contoured to surround the heart inside the outer member operable to actively promote a contraction strain pattern characterized by non-inversion or lack of gross perturbation of the curvature on a diseased or damaged myocardium that promotes beneficial growth and remodeling of the myocardium.
2. A direct cardiac compression device adapted to surround the heart and comprising
a compression means comprising an outer member and at least one inner membrane contoured to surround the heart inside the outer member operable to actively promote a contraction strain pattern on a diseased or damaged cardiac myocardium that reduces apoptosis in the myocardium.
3. The device of claim 2 , further comprising the contraction strain pattern characterized by non-inversion or lack of gross perturbation of the heart's curvature.
4. A direct cardiac compression device comprising:
an outer member;
an inner membrane attached to the outer member and contoured to surround a heart to compresses the heart during contraction without inverting or significantly perturbing the curvatures of the heart; and
fluid between the outer member and the inner membrane, wherein and the device exerts a non curvature-inverting contraction stain pattern when used on a heart, when the fluid is pressurized.
5. The device of claim 4 , further comprising the device installed around the ventricular portion of the heart.
6. The device of claim 4 , further comprising the device anchored to the valve plane of the heart.
7. The device of claim 4 , further comprising a pneumatic drive operable to pressurize the fluid.
8. The device of claim 4 , wherein the outer member comprises an outer shell, membrane, or mesh.
9. The device of claim 4 , wherein the outer member comprises a rigid outer shell.
10. The device of claim 4 , wherein the inner membrane comprises a biocompatible material.
11. The device of claim 10 , wherein the biocompatible material comprises elastomeric polyurethane.
12. A method of assisting a diseased or damaged heart comprising providing a direct cardiac compression device to the heart that compresses the heart during contraction without inverting or significantly perturbing the curvatures of the heart, wherein the direct cardiac compression device comprises an inner membrane attached to an outer member and contoured to surround the heart to compresses the heart during contraction without inverting or significantly perturbing the curvatures of the heart.
13. The method of claim 12 , further comprising inducing ventricular recovery in the heart.
14. The method of claim 12 , further comprising promoting growth and remodeling of the myocardium.
15. The method of claim 12 , further comprising preventing apoptosis of myocytes in the myocardium.
16. The method of claim 12 , further comprising preserving the myocardioum in a borderzone of a myocardial infarct.
17. The method of claim 12 , further comprising opening the chest cavity of a patient to provide access to the heart; and attaching the device of to the valve plane of the heart.