Stent with controlled expansion
View Patent ↗An intraluminal prosthesis composed of a self-expandable stent and a biodegradable constraining element being capable of biodegrading in vivo over a predetermined period of time to permit radial expansion of the stent. The constraining elements are applied to the stent to produce a compressed configuration. Dissolution of the constraining elements in vivo allows for expansion of the stent to an expanded configuration.
1. A method of repairing a diseased tubular organ comprising the steps of:
a. providing a radially self-expanding tubular stent defining a lumen therein comprising first and second ends and a medial portion therebetween;
b. placing a biodegradable constraining element on said stent to constrain said medial portion of said stent to maintain said medial portion of said stent in a compressed state and preventing said medial portion of said stent from diametrically changing to a radially expanded state; and
c. implanting said stent into said diseased tubular organ; and allowing said ends of said stent to contact the healthy tissue surrounding the diseased portion of said diseased tubular organ.
2. The method of claim 1 , wherein said diseased tubular organ includes a diseased portion surrounded by healthy tissue.
3. The method of claim 1 , wherein said diseased tubular organ is a blood vessel.
4. The method of claim 1 , further comprising the step of permitting in vivo biodegradation of said biodegradable constraining element.
5. The method of claim 4 , wherein said biodegradation of said biodegradable constraining element permits said medial portion of said stent to expand to said radially expanded state.
6. The method of claim 1 , wherein said biodegradable constraining element is circumferentially wrapped around said stent.
7. The method of claim 1 , wherein said biodegradable constraining element comprises multiple elements placed about said stent.
8. The method of claim 1 , wherein said biodegradable constraining element is placed on said stent while said stent is in said compressed state.
9. The method of claim 1 , wherein said biodegradable constraining element further comprises a therapeutic agent.