Blood flow diverters for the treatment of intracranial aneurysms
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Abstract
A blood flow diverter device for treatment of intracranial aneurysms, including a porous tubular member having a central portion and two ends. The member is of sufficient flexibility and body compatibility to be placed in proximity within an intracranial aneurysm. The central portion of the tubular member has a sufficiently decreased porosity to block blood flow from entering through the aneurysm. This is done by one of three methods: (1) the central portion of the member can be compressed to decrease porosity and heat set to hold the compression; (2) the angle of the fibers can be altered if the tubular member is made from a braided fibers; or (3) a monomeric coating can be formed on the central portion in an amount sufficient to decrease the porosity of the central portion upon polymerization of the monomeric coating. In the third embodiment a polymerization initiator is provided for polymerizing the monomeric coating upon command to cause the decreased porosity to block the blood flow. The device is heat set after compression to permit insertion and expansion in the patient. The tubular member has sufficient porosity at the two ends to keep open small perforator arteries proximate to the intracranial aneurysm.
144 Citations
29 Claims
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26. A blood flow diverter device for treatment of intracranial aneurysms, comprising:
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a porous tubular member formed from braided thermoplastic fibers having a central portion and two ends, said member being of sufficient flexibility and body compatibility to be placed in proximity with an aneurysm;
said braided fibers being compressed to decrease the porosity of said central portion and heat set to preserve said decrease; and
said central portion of said tubular member having further decreased porosity by coating said central portion with a monomeric coating in an amount sufficient to decrease the porosity of said central portion upon polymerization of said monomeric coating; and
including a polymerization initiator for polymerizing said monomeric coating upon command to cause said decreased porosity to block said blood flow after said device has been placed in proximity with an aneurysm;
whereby said central portion has reduced porosity to block blood flow from entering through the aneurysm. - View Dependent Claims (4, 5, 6, 7, 8, 9, 13, 28)
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27. A method for treatment of intracranial aneurysms, comprising the steps of:
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forming a porous tubular member from braided thermoplastic fibers having a central portion and two ends, said member being of sufficient flexibility and body compatibility to be placed in proximity with an aneurysm;
compressing said braided fibers to decrease the porosity of said central portion and heat setting said fibers to preserve said decrease;
further decreasing the porosity of said central portion of said tubular member by coating said central portion with a monomeric coating in an amount sufficient to decrease the porosity of said central portion upon polymerization of said monomeric coating; and
including a polymerization initiator for polymerizing said monomeric coating upon command to cause said decreased porosity to block said blood flow after said device has been placed in proximity with an aneurysm; and
placing said blood flow diverter device at said aneurysm and initiating said polymerizatioin of said monomeric coating to block blood flow from entering through said aneurysm. - View Dependent Claims (15, 17, 18, 19, 20, 21, 25, 29)
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Specification