Differential covering and coating methods
First Claim
1. A medical appliance for placement within a portion of the anatomy of a patient, the appliance comprising:
- a scaffolding, the scaffolding configured to define a substantially cylindrical member having a distal end and a proximal end and extending longitudinally there between, forming a lumen there through, along the longitudinal extension of the appliance the scaffolding having an interior and an exterior surface comprising struts with geometrical patterns formed by angles, wherein the angles determine the relative flexibility of the medical appliance such that the appliance conforms to the topography of a target lumen and when pressure is exerted along varying points of the longitudinal extension of the appliance, the appliance does not undesirably foreshorten or elongate.
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Accused Products
Abstract
The present invention, in an exemplary embodiment, provides a stent, which combines many of the excellent characteristics of both silicone and metal stents while eliminating the undesirable ones. In particular, a principal objective in accordance with the present invention is to provide a family of stents where the relative hardness/softness of regions of the stent can differ from other regions of the stent to provide additional patient comfort and resistance to compression forces. Exemplary embodiments provide a stent that is covered so as to provide certain predefined characteristics. In particular, a covered stent is provided that is coated internally such that the outer scaffolding surface of the stent has enhanced friction points while the internal surface exemplifies certain characteristics.
103 Citations
28 Claims
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1. A medical appliance for placement within a portion of the anatomy of a patient, the appliance comprising:
a scaffolding, the scaffolding configured to define a substantially cylindrical member having a distal end and a proximal end and extending longitudinally there between, forming a lumen there through, along the longitudinal extension of the appliance the scaffolding having an interior and an exterior surface comprising struts with geometrical patterns formed by angles, wherein the angles determine the relative flexibility of the medical appliance such that the appliance conforms to the topography of a target lumen and when pressure is exerted along varying points of the longitudinal extension of the appliance, the appliance does not undesirably foreshorten or elongate. - View Dependent Claims (10, 11, 12, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- 2. The medical appliance of claim 2, wherein the scaffolding further comprises a coating coupled with the scaffolding such that both the struts and the area between the struts are coated, the coating of sufficient thickness to prevent galvanic current.
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27. A method of covering a medical appliance, comprising the steps of:
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providing a mold having an internal and an external diameter;
providing a medical appliance comprising a scaffolding, the scaffolding configured to define a substantially cylindrical member having a distal end and a proximal end and extending longitudinally there between, forming a lumen there through, along the longitudinal extension of the appliance the scaffolding having an interior and an exterior surface with geometrical patterns formed by angles, wherein the angles determine the relative flexibility of the medical appliance such that the appliance conforms to the topography of a target lumen and when pressure is exerted along varying points of the longitudinal extension of the appliance, the appliance does not undesirably foreshorten or elongate;
inserting the medical appliance into the internal diameter of the mold;
applying a polymer to the interior surface of the medical appliance; and
annealing the polymer to the stent by applying heat to the polymer. - View Dependent Claims (28)
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Specification