| http://www.w3.org/ns/prov#value | - without injuring the cavity; the sleeve overlaps the stent at the margin for a maximum distance of 3 mm; the sleeve is formed from silicone; most preferably the sleeve is formed from an elastomer able to be expanded at least two times by internal pressure below those usable with a balloon angioplasty catheter, and formable into a thin walled tube, e.g., a pressure of about 3-17 atmospheres; the s
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