Polymer metal and composite implantable medical devices
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a medical device and metal composite technology, applied in the field of polymer metal and composite implantable medical devices, can solve the problems of large profile, difficult visualization of stents during delivery and after deployment, and inability to bioerode, and achieve the effect of different erosion ra
Inactive Publication Date: 2011-12-15
ABBOTT CARDIOVASCULAR
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However, in order to have adequate mechanical strength, such stents require significantly thicker struts than a metallic stent, which results in a larger profile.
In addition, biodegradable polymers, unlike metals, are not radio-opaque which makes visualization of a stent difficult during delivery and after deployment.
Moreover, although biostable metallic stents possess favorable mechanical properties, are radio-opaque, and have smaller profiles than polymer-fabricated stents, they are not bioerodable.
Bioerodable metallic stents tend to erode too fast, resulting in complete or nearly complete bioerosion before the end of a treatment time.
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[0021]The term “implantable medical device” is intended to include self-expandable stents, balloon-expandable stents, stent-grafts, and grafts. The structural pattern of the device can be of virtually any design. A stent, for example, may include a pattern or network of interconnecting structural elements or struts. FIG. 1 depicts a three-dimensional view of a stent 100 which shows struts 105. The implantable medical device has a cylindrical axis 110. The pattern shown in FIG. 1 should not be limited to what has been illustrated as other stent patterns are easily applicable with the method of the invention. A stent such as stent 100 may be fabricated from a tube by forming a pattern with a technique such as laser cutting or chemical etching.
[0022]Various embodiments of the present invention relate to implantable medical devices and methods of manufacturing such devices that possess desired combinations and degrees of properties such as radial strength, flexibility, radio-opacity, lo...
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Abstract
A device and a method of manufacturing an implantable medical device, such as a stent, are described herein. The device includes a metallic region composed of a bioerodable metal and a polymer region composed of a biodegradable polymer contacting the metallic region. The metallic region may erode at a different rate when exposed to bodily fluids than the polymer region when exposed to bodily fluids. In certain embodiments, the polymer region is an outer layer and the metallic region is an inner layer of the device.
Description
CROSS-REFERENCE[0001]This is a continuation of application Ser. No. 10 / 880,025 which is a continuation-in-part of application Ser. No. 10 / 767,296 filed on Jan. 28, 2004, issued as U.S. Pat. No. 7,699,890, which is a divisional application of application Ser. No. 10 / 235,033, which was filed on Sep. 3, 2002, issued as U.S. Pat. No. 6,723,120, which is a continuation of application Ser. No. 09 / 797,313, filed on Mar. 1, 2001, which is a division of application Ser. No. 08 / 837,993, filed on Apr. 15, 1997, and issued Jun. 5, 2001 as U.S. Pat. No. 6,240,616. The contents of application Ser. No. 10 / 880,025 are incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to polymer and metal composite implantable medical devices, such as stents.[0004]2. Description of the State of the Art[0005]This invention relates to radially expandable endoprostheses which are adapted to be implanted in a bodily lumen. An “endoprosthesis” correspo...
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