Substrate with rotatable struts for medical device

Abstract

A medical device is operable to extend and/or retract elements suitable for a particular purpose. The elements are extended and/or retracted in response to a stress applied by way of stretching and/or retracting the device, among other methods. The elements may remain extended and/or retracted or may recoil back to an initial position upon the removal of the force. In various embodiments, the elements are used to treat or deliver treatment to a target site within a body.

What is further claimed is: 
     
         1 . A medical device comprising:
 a substrate defining a major surface, the major surface defining a plane, the major surface including a plurality of first struts along the major surface interconnected with a plurality of second struts extending along the major surface, the second struts including intermediate sections having a plurality of projections extending therefrom,   wherein, when the substrate is stretched, the intermediate sections of the second struts and the plurality of projections are operable to rotate relative to the first struts and bend out of the plane of the major surface substrate when the substrate is stretched in the first direction,   the plurality of projections including microneedles having lumens operable to be in fluid communication with a manifold and a fluid repository.   
     
     
         2 . The medical device of  claim 1 , wherein at least some of the first and second struts are of tubular construction and have lumens in fluid communication with the microneedles and the fluid repository. 
     
     
         3 . The medical device of  claim 1 , wherein manifold has a therapeutic fluid contained therein. 
     
     
         4 . The medical device of  claim 1 , wherein the fluid repository is located adjacent a proximal end of the medical device. 
     
     
         5 . The medical device of  claim 1 , further comprising a therapeutic coating covering the plurality of projections, wherein the rotation of the plurality of projections from the stretching of the substrate along the direction perpendicular to the first direction is operable to fracture the therapeutic coating. 
     
     
         6 . The medical device of  claim 1 , wherein the substrate is a tubular substrate, wherein the tubular substrate defines a lumen having a longitudinal axis, wherein the plurality of projections remain coincident relative to the substrate when the substrate is radially unstretched, and wherein the plurality of projections extend radially outward when radial stretching of the substrate induces rotation of the second struts relative to the first struts. 
     
     
         7 . The medical device of  claim 6 , wherein the plurality of projections remain flat relative to the substrate when the substrate is longitudinally stretched and radially unstretched. 
     
     
         8 . The medical device of  claim 1 , wherein the substrate is a tubular substrate, wherein the tubular substrate defines a lumen having a longitudinal axis, wherein the plurality of projections remain coincident relative to the substrate when the substrate is longitudinally unstretched, and wherein the plurality of projections extend radially outward when longitudinal stretching of the substrate induces rotation of the second struts relative to the first struts. 
     
     
         9 . The medical device of  claim 8 , wherein the plurality of projections remain flat relative to the substrate when the substrate is radially stretched and longitudinally unstretched. 
     
     
         10 . The medical device of  claim 6 , wherein the medical device is configured to radially collapse to draw together tissue surfaces captured by the plurality of projections. 
     
     
         11 . The medical device of  claim 10 , wherein the medical device further includes a collar configured to cover the lumen. 
     
     
         12 . The medical device of  claim 6 , wherein the tubular substrate is radially self-expandable. 
     
     
         13 . The medical device of  claim 12 , wherein the tubular substrate is radially balloon-expandable. 
     
     
         14 . The medical device of  claim 13 , wherein the tubular substrate is radially self-expandable to an intermediate diameter from a collapsed diameter, wherein the tubular substrate is radially balloon-expandable to an expanded diameter from the intermediate diameter, and wherein the plurality of projections rotate with the intermediate sections of the plurality of second struts to project outwardly relative to the plurality of first struts between the collapsed diameter and the expanded diameter. 
     
     
         15 . The medical device of  claim 14 , wherein the plurality of projections rotate with the intermediate sections of the plurality of second struts to project outwardly relative to the plurality of first struts between the intermediate diameter and the expanded diameter, and wherein the plurality of projections remain flat relative to the substrate when the substrate expands from the collapsed diameter to the intermediate diameter. 
     
     
         16 . The medical device of  claim 6 , wherein the tubular substrate forms at least a portion of a stent. 
     
     
         17 . The medical device of  claim 16 , further comprising a tubular graft layered with the substrate to form a stent graft. 
     
     
         18 . A medical system comprising:
 the medical device of  claim 1 , and   a delivery device configured to induce the stretching of the substrate, wherein a deployment of the medical device includes stretching of the substrate such that the second struts rotate relative to the first struts.   
     
     
         19 . A medical system comprising:
 the medical device of  claim 1 , and   a delivery device configured to deliver the medical device within a confined orifice of a patient, wherein the substrate is a flat sheet curled up within the delivery device, wherein the delivery device is operable to deploy the substrate within the confined orifice such that the flat sheet at least partially uncurls within the confined orifice, and wherein the medical device is configured to be used as a hernia patch with the plurality of projections being configured to contact or penetrate a tissue of the patient adjacent an opening in the tissue at a herniation.   
     
     
         20 . A medical system com prising:
 the medical device of  claim 6 , and   a delivery device configured to deliver the medical device within a vasculature of a patient with the medical device in a collapsed configuration, wherein the delivery device is operable to deploy the tubular substrate within the vasculature, and wherein a deployment of the medical device includes stretching of the tubular substrate to an expanded configuration such that the second struts rotate relative to the first struts.   
     
     
         21 . The medical system of  claim 20 , wherein, when the tubular substrate is deployed in the expanded configuration, raised edges of the tubular substrate are configured to scrape and clear thrombus from within the vasculature. 
     
     
         22 . The medical system of  claim 20 , wherein, when the tubular substrate is deployed in the expanded configuration, the tubular substrate is configured to engage an inner wall of the vasculature. 
     
     
         23 . A medical system of  claim 20 , wherein the medical device is the medical device of any of  claims 6 - 17 , and wherein a deployment of the medical device includes stretching of the tubular substrate to the expanded configuration such that the second struts and the plurality of projections rotate relative to the first struts. 
     
     
         24 . The medical system of  claim 23 , wherein the plurality of projections are configured to penetrate an inner wall of the vasculature. 
     
     
         25 . A method of manufacturing the medical device of  claim 1 , the method com prising:
 cutting a sheet of substrate material to form the substrate including the plurality of first struts and the plurality of second struts, wherein the plurality of first struts are interconnected with the plurality of second struts in the cut sheet of substrate material.   
     
     
         26 . The method of  claim 25 , wherein cutting the sheet of substrate material to form the substrate further includes forming the plurality of projections extending from the intermediate sections of the second struts. 
     
     
         27 . The method of  claim 25 , further comprising stretching the substrate along the direction perpendicular to the first direction to rotate the second struts relative to the first struts and bend the intermediate sections of the second struts in the plane parallel to the widths of the second struts as the substrate elongates along the direction perpendicular to the first direction. 
     
     
         28 . A medical device comprising:
 a substrate defining a major surface, the major surface defining a plane, the major surface including a plurality of first struts along the major surface interconnected with a plurality of second struts extending along the major surface, the second struts including intermediate sections having a plurality of projections extending therefrom,   wherein, when the substrate is stretched, the intermediate sections of the second struts and the plurality of projections are operable to rotate relative to the first struts and bend out of the plane of the major surface substrate when the substrate is stretched in the first direction,   the plurality of projections including a plurality of caps configured to remain within a patient tissue following insertion and removal of the distal ends into the patient tissue.   
     
     
         29 . The medical device of  claim 28 , wherein the plurality of caps are positioned on distal tips of the plurality of projections. 
     
     
         30 . The medical device of  claim 28 , wherein the plurality of caps include a coating or a releasable sheath. 
     
     
         31 . The medical device of  claim 28 , wherein the plurality of caps include a barbed sleeve. 
     
     
         32 . The medical device of  claim 28 , wherein the plurality of caps are biodegradable. 
     
     
         33 . The medical device of  claim 28 , wherein the plurality of caps are polymeric or metallic. 
     
     
         34 . The medical device of  claim 28 , wherein the plurality of caps are coated in a hydrogel operable to swell as the hydrogel absorbs moisture.