Implantable medical device assembly
View Patent ↗The present invention is directed to implantable medical device assemblies. The assemblies are primarily used to introduce and deposit implantable medical devices in the vasculatures of implant recipients. The principle implantable medical device used in the assembly is an expandable element in the form of an endovascular device. The expandable element is maintained in a compacted configuration during introduction of the device into the vasculature with a confinement means. The expandable element is released from the confinement means at an implantation site with a control line. The control line has high tensile strength, high modulus, structural rigidity, and low compressibility. These features of the control line provide a practitioner with tactile feedback of the release of the expandable element from the confinement means. The tactile feedback is present during the entire deployment of the expandable element. The tactile feedback enables the practitioner to better track and control deployment of the expandable element at an implantation site.
1. An implantable medical device assembly comprising:
an expandable endovascular device;
confinement means containing said expandable endovascular device in a compacted configuration;
at least one control line comprising a monofilamentous non-fluoropolymer core and an expanded polytetrafluoroethylene cover surrounding the core, wherein the control line is removably attached to the confinement means by stitching; and
wherein the stitched control line has a stiffness sufficient to require essentially every stitch in the confinement means to be removed one stitch at a time;
whereby the stitched control line provides tactile feedback to a practitioner as essentially every stitch is removed from said confinement means, and wherein the tactile feedback is in the form of oscillating pulling forces that vary in magnitude as substantially every stitch is removed from the confinement means.
2. The implantable medical device assembly of claim 1 wherein said control line has a ratio of ultimate tensile strength divided by slip knot pull through force of greater than about 4.
3. The implantable medical device assembly of claim 1 wherein said control line has a ratio of ultimate tensile strength divided by slip knot pull through force of greater than about 5.
4. The implantable medical device assembly of claim 1 wherein said control line has a ratio of ultimate tensile strength divided by slip knot pull through force of greater than about 6.
5. The implantable medical device assembly of claim 1 wherein the endovascular device is a stent.
6. The implantable medical device assembly of claim 5 wherein the stent has a permanent covering placed on at least a portion of the stent.
7. The implantable medical device assembly of claim 1 wherein the endovascular device is a stent-graft.
8. The implantable medical device assembly of claim 1 wherein the endovascular device is an intra-cardiac device.
9. The implantable medical device assembly of claim 1 wherein the control line has a tensile strength of at least 14 pounds force.
10. The implantable medical device assembly of claim 1 wherein the core comprises an aramid polymer.
11. The implantable medical device assembly of claim 1 wherein the core comprises a liquid crystal polymer.
12. The implantable medical device assembly of claim 1 wherein the core comprises polyethyleneterephthalate.
13. The implantable medical device assembly of claim 1 wherein the core comprises polyamid.