Self-adjusting attachment structure for a cardiac support device
A cardiac support device includes 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 including:
a compliant jacket comprising a knit material and having base and apex regions, the jacket being circumferentially closed between the base and apex regions, the base region defining an open end, the jacket configured for surrounding at least a lower portion of a heart and constraining cardiac expansion; and
means for self-fitting the jacket to the heart attached directly at one or more locations to the jacket and at the open end of the base region of the jacket, wherein the means: (i) is configured to be positioned in an atrial-ventricular groove of the heart, (ii) is configured for holding the open end in the atrial-ventricular groove of the heart to self-secure the jacket to the heart, and (iii) extends continuously around the base region to provide self-adjusting fitting of the open end in the atrial-ventricular groove of the heart around an entire circumference of the base region.
2. The cardiac support device of claim 1 , wherein the cardiac support device is configured to be implanted on the heart using a minimally invasive approach and to become attached to the heart by tissue fibrosis.
3. The cardiac support device of claim 1 , wherein the jacket is elastic.
4. The cardiac support device of claim 1 , wherein the means for holding the open end in the atrial-ventricular groove comprises an elastic attachment band.
5. The cardiac support device of claim 4 , wherein the elastic attachment band comprises a polymer band.
6. The cardiac support device of claim 4 , wherein the elastic attachment band extends completely around the jacket.
7. The cardiac support device of claim 4 , wherein the elastic attachment band is attached to the jacket within a channel defined at the base region.
8. The cardiac support device of claim 7 , wherein the channel defines the open end.
9. The cardiac support device of claim 7 , wherein the channel comprises a hem of the knit material.