Radioisotope stent with non-radioactive end sections
First Claim
1. A stent having a thin-walled, cylindrical structure for implantation at the site of a vascular stenosis, the stent having a proximal end section that extends longitudinally for a length L2, a distal end section that extends longitudinally for a length L3, and a central section extending longitudinally for a length L1, the central section being situated longitudinally between the proximal end section and the distal end section, the central section of the stent being radioactive and both the proximal end section and the distal end section being non-radioactive.
0 Assignments
0 Petitions
Accused Products
Abstract
A radioisotope stent that is made radioactive for most of the stent'"'"'s length at a center section of the stent, but is not radioactive for a limited length at each end section of the stent. Such a stent design would have a negligible radiation level at the extreme ends of the stent. Therefore, there will not be any portion of the dilated stenosis that has no mechanical support from the stent and is also exposed to a moderate level of radiation. Furthermore, all portions of the dilated stenosis that are exposed to a high or moderate level of radiation will be mechanically supported by the stent so as to preclude the phenomena of late vascular contraction. Thus it is an object of this invention to have a stent that is designed with a comparatively high level of radioactivity at a longitudinally central section of the stent and would be free of any radioactivity at each of the two end sections of the stent.
-
Citations
16 Claims
- 1. A stent having a thin-walled, cylindrical structure for implantation at the site of a vascular stenosis, the stent having a proximal end section that extends longitudinally for a length L2, a distal end section that extends longitudinally for a length L3, and a central section extending longitudinally for a length L1, the central section being situated longitudinally between the proximal end section and the distal end section, the central section of the stent being radioactive and both the proximal end section and the distal end section being non-radioactive.
Specification