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Stent and method and apparatus for forming and delivering the same
| Details |
Inventors: Kleshinski, Stephen J.; Simon, Morris A.; Rabkin, Dmitry;
Assignee: Nitinol Medical Technologies, Inc. (Boston, MA)
Primary Examiner: Buiz; Michael
Assistant Examiner: Trinh; Vikki
Attorney, Agent or Firm: Sixbey, Friedman, Leedom & Ferguson, Sixbey; Daniel W.
A stent comprising a wire skeletal frame, the frame being adapted to assume a first condition in which the frame is relatively rigid and substantially tubular in configuration and a second condition in which the frame is flexible, of reduced stress, and collapsible, such that in the second condition walls of the frame are adapted to be positioned against each other to form a stent diameter substantially equal to the combined thickness of the frame walls in abutting engagement with each other, the frame in its second condition being substantially devoid of bias therein urging the frame to assume the first configuration. |
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DETAILED DESCRIPTION It is, therefore, an object of the invention to provide a stent adapted to assume a first configuration in which the stent is expanded, capable of exercising considerable stress if confined, as by a vessel wall, and substantially tubular in configuration for holding open a vascular passageway, and a second configuration in which the stent is flexible, in a reduced stress state, and adapted to be compressed into a small enough size to fit within the small bore of a delivery catheter.
A further object of the invention is to provide such a stent which is adapted to change from the first condition of relative rigidity to the second condition of flexibility and reduced stress, by exposure to a preselected transition temperature, such that the stent may be relaxed in place in a vascular passageway by cooling to facilitate repositioning thereof without damage to walls of the passageway.
A still further object of the invention is to provide such a stent laminated within an elastomeric sleeve, the sleeve being expandable to conform to the stent's first, i.
e.
rigid, condition and having therein a bias towards assuming a smaller size, such that upon the stent's assuming the second, i.
e.
flexible, condition, the sleeve operates to compress the stent to a size less than its expanded size.
Yet another object of the present invention is to provide such a stent formed from a plurality of cells each having first and second spaced, substantially parallel cell sides which are joined to one of the first or second cell sides of an adjacent cell.
The cell sides of all of the cells are substantially parallel to the central longitudinal axis of the stent or the stent section which the cells form.
A further object of the present invention is to provide such a stent formed from a plurality of cells, each of which includes first and second spaced, straight side portions which are joined to one of the first or second straight side portions of an adjacent cell.
The straight side portions of all cells are substantially parallel to the central longitudinal axis of the stent or the stent section which the cells form
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