Enhanced radioactive stent for reduction of restenosis
First Claim
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1. An ablation apparatus system comprising:
- a vascular stent, wherein the vascular stent comprises a non-radioactive elongated metallic tube having open ends, and a sidewall containing a multiplicity of openings therethrough to allow said stent to be expanded radially for deployment in a blood vessel subjected to angioplasty so as to maintain the lumen of blood vessel open;
wherein a thin coating on an exterior surface of the tube, said coating including a carrier composed of a biocompatible material and having dispersed therein a radioactive substance;
detachable conducting wire means for detachably contacting said tube, said detachable conducting wire means having a wire distal end and a wire proximal end, wherein the wire distal end is to contact the elongated metallic tube and the wire proximal end is coupled to a radiofrequency current source; and
a radiofrequency current generating means for generating radiofrequency current and for generating heat within the tissue, wherein the radiofrequency current is transmitted to the vascular stent through the detachable conducting wire means so that the radioactive substance diffuses more quickly into the heated tissue for prolonged radiotherapy for tissue treatment.
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Abstract
An ablation apparatus system for treating tissues or atherosclerosis on a patient having a stent or a metallic implant, wherein said stent or metallic implant comprises a coating layer including a carrier composed of a biocompatible material and having dispersed therein a radioactive substance, the ablation apparatus system comprising an electrical conducting wire that is coupled to an external radiofrequency generator for delivering the radiofrequency current to the stent or the metallic implant for the purposes of thermally enhanced irradiation capability for tissue therapeutic treatment.
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Citations
20 Claims
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1. An ablation apparatus system comprising:
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a vascular stent, wherein the vascular stent comprises a non-radioactive elongated metallic tube having open ends, and a sidewall containing a multiplicity of openings therethrough to allow said stent to be expanded radially for deployment in a blood vessel subjected to angioplasty so as to maintain the lumen of blood vessel open;
wherein a thin coating on an exterior surface of the tube, said coating including a carrier composed of a biocompatible material and having dispersed therein a radioactive substance;
detachable conducting wire means for detachably contacting said tube, said detachable conducting wire means having a wire distal end and a wire proximal end, wherein the wire distal end is to contact the elongated metallic tube and the wire proximal end is coupled to a radiofrequency current source; and
a radiofrequency current generating means for generating radiofrequency current and for generating heat within the tissue, wherein the radiofrequency current is transmitted to the vascular stent through the detachable conducting wire means so that the radioactive substance diffuses more quickly into the heated tissue for prolonged radiotherapy for tissue treatment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of preventing restenosis of a blood vessel which has undergone angioplasty to open a restricted region of a lumen of the vessel, the method comprising inserting a stent into the blood vessel and deploying the stent to contact the vessel wall at the site of the restricted region;
- irradiating the tissue in the wall at said site with a radioactive substance in a coated layer which is coated to an exterior surface of the stent; and
providing radiofrequency current from a radiofrequency current generator to the stent and heat to the surrounding vessel wall through an electrical conducting wire so that the radioactive substance diffuses more quickly into the heated tissue for prolonged radiotherapy. - View Dependent Claims (10, 11, 12, 13, 14)
- irradiating the tissue in the wall at said site with a radioactive substance in a coated layer which is coated to an exterior surface of the stent; and
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15. A method for treating tissues of a patient having a metallic implant, said metallic implant having a thin coating on an exposed surface of said implant and said coating including a carrier composed of a biocompatible material and having dispersed therein a radioactive substance that diffuses readily in contact with heated tissue;
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the method comprising the steps of; (a) inserting detachable conducting wire means for detachably contacting said metallic implant, said detachable conducting wire means having a wire distal end and a wire proximal end, wherein the wire distal end is to contact the metallic implant and the wire proximal end is to be coupled to a radiofrequency current source; and
(b) applying radiofrequency current from a radiofrequency current generating means to the metallic implant through the detachable conducting wire means so that the radioactive substance diffuses more quickly into the heated tissue for prolonged radiotherapy. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification