Device and method for ablation of cardiac tissue
First Claim
1. A method for ablation of myocardial tissue comprising:
- providing a hand-held instrument having a first hollow needle coupled to a first fluid delivery lumen for delivery of a first fluid and a second hollow needle coupled to a second fluid delivery lumen for delivery of a second fluid;
selecting a desired line of ablation on a surface of the tissue;
applying the first needle to the tissue at a first portion of the desired line of ablation such that it penetrates the tissue;
applying the second needle to the tissue at a second portion spaced apart from the desired line of ablation such that it penetrates the tissue;
delivering a predetermined amount of the first fluid into the penetrated tissue to facilitate ablation of the first portion of tissue along the desired lesion line; and
delivering a predetermined amount of the second fluid into the penetrated tissue to protect the second portion of tissue spaced apart from the desired lesion line.
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Accused Products
Abstract
Methods for delivering precise amounts of fluid into cardiac tissue for the purpose of facilitating ablation of the tissue along a desired lesion line. One method injects fluid through a hollow needle. The injected fluid can be a highly conductive fluid injected in conjunction with radiofrequency ablation to create an ablative virtual electrode. The injected conductive fluid can provide deeper and narrower conduction paths and resulting lesions. Radiofrequency ablation can be performed at the same time as the fluid injection, using the injection device as an electrode, or subsequent to the fluid injection, using a separate device. In some methods, the injected fluid is a protective fluid, injected to protect tissue adjacent to the desired lesion line. Fluid delivery can be endocardial, epicardial, and epicardial on a beating heart. The present methods find one use in performing maze procedures to treat atrial fibrillation.
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Citations
57 Claims
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1. A method for ablation of myocardial tissue comprising:
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providing a hand-held instrument having a first hollow needle coupled to a first fluid delivery lumen for delivery of a first fluid and a second hollow needle coupled to a second fluid delivery lumen for delivery of a second fluid; selecting a desired line of ablation on a surface of the tissue; applying the first needle to the tissue at a first portion of the desired line of ablation such that it penetrates the tissue; applying the second needle to the tissue at a second portion spaced apart from the desired line of ablation such that it penetrates the tissue; delivering a predetermined amount of the first fluid into the penetrated tissue to facilitate ablation of the first portion of tissue along the desired lesion line; and delivering a predetermined amount of the second fluid into the penetrated tissue to protect the second portion of tissue spaced apart from the desired lesion line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for ablation of myocardial tissue comprising:
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providing a hand-held instrument having a first injection port for injecting a first fluid into myocardial tissue and a second injection port for injecting a second fluid into myocardial tissue; selecting a desired line of ablation on a surface of the tissue; applying the first injection port to the tissue at a portion of the desired line of ablation; applying the second injection port to the tissue at a second portion spaced apart from the desired line of ablation; delivering a predetermined amount of the first fluid into the myocardial tissue to facilitate ablation of the tissue along the desired lesion line; and delivering a predetermined amount of the second fluid into the myocardial tissue to protect tissue spaced apart from the desired lesion line. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification