Flexible stent having a pattern formed from biocompatible material

I|||||||||||||Ill||||||||||||||||llll|||||||||||||||||||||||||||||||||||||| USOORE42244E (19) United States

(12) Reissued Patent (10) Patent Number! US RE42,244 E Boatman et al. (45) Date of Reissued Patent: Mar. 22, 2011

FOREIGN PATENT DOCUMENTS

EP 274846 * 7/1988
EP 364787 * 4/1990
EP 481365 * 4/1992
EP 540290 * 5/1993
FR 2617721 * 1/1989
FR 2660562 * 10/1991
SU 660689 * 5/1979
WO 83/00997 * 3/1983
WO 93/06792 * 4/1993
EP 274846 * 7/1988
EP 364787 * 4/1990
EP 481365 * 4/1992
EP 540290 * 5/1993
FR 2617721 * 1/1989
FR 2660562 * 10/1991
SU 660689 * 5/1979
WO 83/00997 * 3/1983
WO 93/06792 * 4/1993

Primary Examiner—Todd E Manahan

Assistant Examiner—Katherine M Dowe

(74) Attorney, Agent, or Firm—Brinks Hofer Gilson & Lione

(57) ABSTRACT

A flexible stent having a waveform pattern formed from a [sheet of] biocompatible material [and] into a tubular shape for maintaining the patency of a lumen such as in a coronary vessel. The waveform pattern of the stent is formed from a flat sheet of malleable, biocompatible material by, for example, photochemically etching the [sheet] biocompatible material and leaving a framework or plurality of closed cells. The waveform pattern is formed into a tubular shape around a deflated, delivery catheter balloon with segments of the closed cells being interposed only overlapping a reinforcing member extending longitudinally along the stent. The stent material is treated to reduce the coefficient of friction of the material and to aid in the radial expansion of the stent with the balloon. Radiopaque markers are positioned at the ends of the stent to aid the physician in positioning the stent at an occlusion site.

43 Claims, 9 Drawing Sheets

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