Cardiac support device with differential compliance
A cardiac support device comprising a jacket of flexible and biocompatible material having a first axis for alignment generally parallel to a longitudinal axis of a patient's heart and a second axis that is transverse to the first axis. The material exhibits an amount of expansion in response to a force applied to the material along the first axis that is different than an amount of expansion in response to the force applied to the material along the second axis.
1. A method for treating heart disease in a mammal, including:
passively constraining expansion of the heart, from an apex of the heart to the heart's A-V groove, along both a first axis aligned generally parallel to a longitudinal axis of the heart and a second axis that is transverse to the first axis; and
causing the amount of constraint in response to a force applied along the first axis to be different than an amount of constraint in response to a force applied along the second axis.
2. The method of claim 1 wherein causing the amount of constraint in response to a force applied along the first axis to be different than an amount of constraint in response to a force applied to the second axis includes causing the amount of constraint in response to a force applied along the first axis to be less than an amount of constraint in response to a force applied to the second axis.
3. The method of claim 1 wherein passively constraining expansion of the heart includes applying elastic constraint to the heart.
4. A method for treating disease in a mammalian heart having a longitudinal axis and a transverse axis, comprising placing on the mammalian heart a jacket, extending from an apex of the heart to the heart's A-V groove, of flexible and biocompatible material having first and second transverse axes and exhibiting an amount of expansion in response to a force applied to the material along the first axis that is different than an amount of expansion in response to the force applied to the material along the second axis, including placing the jacket with the first axis aligned with the longitudinal axis of the heart and the second axis aligned with the transverse axis of the heart.
5. The method of claim 4 wherein placing the jacket on the heart further includes placing a jacket of flexible and elastic biocompatible material.
6. The method of claim 5 wherein placing the jacket on the heart further includes placing a jacket of material formed from elongated strands.
7. The method of claim 6 wherein placing the jacket on the heart further includes placing a jacket of material having open cells.
8. The method of claim 7 wherein placing the jacket on the heart further includes placing a jacket of material formed from metal elongated strands.
9. The method of claim 8 wherein placing the jacket on the heart includes applying a jacket of enclosed material having an open upper end over an apex of the heart.
10. The method of claim 7 wherein placing the jacket on the heart includes placing a jacket exhibiting an amount of expansion in response to the force applied to the material along the first axis that is greater than the amount of expansion in response to the force applied to the material along the second axis.
11. The method of claim 10 wherein placing the jacket on the heart further includes placing a jacket of material formed from polymer elongated strands.
12. The method of claim 4 wherein placing the jacket includes placing a jacket exhibiting an amount of expansion in response to the force applied to the material along the first axis that is greater than the amount of expansion in response to the force applied to the material along the second axis.
13. The method of claim 4 wherein placing the jacket on the heart includes applying a jacket of enclosed material having an open upper end over an apex of the heart.
14. A method, including causing a jacket of flexible and biocompatible material having first and second transverse axes and exhibiting an amount of expansion in response to a force applied to the material along the first axis that is different than an amount of expansion in response to the force applied to the material along the second axis to be placed on a mammalian heart, extending from an apex of the heart to the heart's A-V groove, having a longitudinal axis and a transverse axis for purposes of treating disease of the heart, including providing the jacket configured for placement with the first axis aligned with the longitudinal axis of the heart and the second axis aligned with the transverse axis of the heart.