RF treatment apparatus
First Claim
1. A tissue ablation apparatus, comprising:
- a tissue penetrating member with a tissue piercing distal end;
an elongated delivery device coupled to the tissue penetrating member;
an RF electrode with a tissue piercing distal tip and positionable in the elongated delivery device, the RF electrode having a non-deployed state when positioned in the delivery device and a deployed state, wherein in the deployed state, the RF electrode distal end exhibits a changing direction of travel as the RF electrode is advanced from the delivery device into a selected tissue site; and
an electrode advancement member coupled to the RF electrode for advancing the RF electrode out of the elongated delivery device.
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Abstract
An RF treatment apparatus includes a catheter with a catheter lumen. A removable needle electrode is positioned in the catheter lumen in a fixed relationship to the catheter. The needle electrode includes a needle lumen and a needle electrode distal end. A removable introducer is slidably positioned in the needle lumen. The introducer includes an introducer distal end. A first sensor is positioned on a surface of the needle electrode or the insulator. An RF power source is coupled to the needle electrode and a return electrode. An insulator sleeve is slidably positioned around the electrode and includes a second sensor. Resources are associated with the electrodes, sensors as well as the RF power source for maintaining a selected power at the electrode independent of changes in current or voltage.
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Citations
15 Claims
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1. A tissue ablation apparatus, comprising:
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a tissue penetrating member with a tissue piercing distal end;
an elongated delivery device coupled to the tissue penetrating member;
an RF electrode with a tissue piercing distal tip and positionable in the elongated delivery device, the RF electrode having a non-deployed state when positioned in the delivery device and a deployed state, wherein in the deployed state, the RF electrode distal end exhibits a changing direction of travel as the RF electrode is advanced from the delivery device into a selected tissue site; and
an electrode advancement member coupled to the RF electrode for advancing the RF electrode out of the elongated delivery device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
an impedance monitoring device coupled to the RF electrode.
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12. The apparatus of claim 1, wherein the RF electrode is deployable with curvature from the elongated delivery device.
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13. A method of creating a lesion in tissue, comprising:
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providing a tissue penetrating member with a tissue piercing distal end;
providing a treatment apparatus coupled to an RF energy source, the treatment apparatus including an elongated delivery device and an RF electrode with a tissue piercing distal tip, the RP electrode being positionable in the elongated delivery device in a non-deployed state when positioned in the delivery device and advanceable from the elongated delivery device in a deployed state where an RF electrode distal end exhibits a changing direction of travel as the RF electrode is advanced from the delivery device into a selected tissue site;
introducing the tissue penetrating member to a selected tissue site;
positioning the elongated member at least partially in the tissue penetrating member;
advancing the RF electrode from the elongated member, the RF electrode exhibiting a changing direction of travel as it advanced through tissue;
delivering energy from the RF electrode to a target tissue site; and
creating cell necrosis at the target tissue site. - View Dependent Claims (14, 15)
forming a closed electrical circuit through the selected tissue site.
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15. The method of claim 13, further comprising:
operating the RF energy source to create a lesion of predetermined size and shape.
Specification