Self-adjusting attachment structure for a cardiac support device
A cardiac support device including a jacket and elastic attachment structure for self-securing the jacket to a heart. The attachment structures can include undulating metal and polymer elements, a silicone band and elastomeric filaments on a base end of the jacket.
1. A cardiac support device comprising:
a compliant and elastic jacket configured to be implanted on a heart using a minimally invasive approach and to become attached to the heart by tissue fibrosis, the jacket having a base end and an apex end, the jacket having an upper edge at the base end and being circumferentially closed between the base end and the apex end, the jacket configured for surrounding at least a lower portion of the heart and for constraining expansion of the heart, the jacket having an opening at the base end for positioning the base end in an atrial-ventricular groove of the heart, the jacket being formed from knit, open-cell material, the jacket having a channel extending circumferentially around the base end such that the channel defines the upper edge at the base end; and
an elastic attachment band disposed within the channel and extending circumferentially around the base end of the jacket, the elastic attachment band configured to be positioned in the atrial-ventricular groove such that the elastic attachment band self-secures the jacket to the heart by applying a force that engages and holds the base end of the jacket in the atrial-ventricular groove of the heart during expansions and contractions of the heart,
wherein the elastic attachment band comprises a polymer band.
2. The cardiac support device of claim 1 , wherein a compliance of the elastic attachment band is greater than a compliance of the jacket.
3. The cardiac support device of claim 1 , wherein the elastic attachment band can be stretched to a stressed state while the jacket is in an un-stressed state.
4. The cardiac support device of claim 1 , wherein the channel comprises a hem of the knit, open-cell material.
5. The cardiac support device of claim 1 , wherein the elastic attachment band is free-floating within the channel.
6. The cardiac support device of claim 1 , wherein: the jacket has a first elasticity; and the elastic attachment band has a second elasticity that is greater than the first elasticity.
7. The cardiac support device of claim 1 wherein: the jacket has a first elasticity; and the elastic attachment band has a second elasticity that is less than the first elasticity.
8. The cardiac support device of claim 1 , wherein the elastic attachment band is attached to the jacket within the channel.
9. The cardiac support device of claim 1 , wherein the elastic attachment band extends completely around the jacket.
10. The cardiac support device of claim 1 , wherein the elastic attachment band extends partially around the jacket.
11. The cardiac support device of claim 1 , wherein the elastic attachment band includes a plurality of segments at spaced-apart locations.
12. The cardiac support device of claim 1 , wherein the elastic attachment band includes a hoop having two free ends.
13. The cardiac support device of claim 1 , wherein the polymer band defines one or more apertures.
14. The cardiac support device of claim 1 , wherein the elastic attachment band includes a plurality of spaced-apart polymer bands.
15. The cardiac support device of claim 1 , wherein the polymer band is a solid band.
16. A cardiac support device comprising:
a compliant and elastic jacket configured to be implanted on a heart using a minimally invasive approach and to become attached to the heart by tissue fibrosis, the jacket having base and apex regions, the jacket being circumferentially closed between the base and apex regions, the jacket configured for surrounding at least a lower portion of the heart and for constraining expansion of the heart, the base region having an open end defined by a channel extending circumferentially along an edge of the open end, the jacket being formed from knit, open-cell material; and
an elastic attachment band extending circumferentially in the channel, the elastic attachment band configured to be positioned in the atrial-ventricular groove such that the elastic attachment band self-secures the jacket to the heart by applying a force that engages and holds the base region of the jacket in the atrial-ventricular groove of the heart,
wherein the elastic attachment band comprises a polymer band.
17. The cardiac support device of claim 16 , wherein the elastic attachment band is attached to the jacket within the channel.
18. The cardiac support device of claim 16 , wherein the elastic attachment band extends completely around the jacket.
19. The cardiac support device of claim 16 , wherein the elastic attachment band extends partially around the jacket.
20. The cardiac support device of claim 16 , wherein the elastic attachment band includes a plurality of segments at spaced-apart locations.