Apparatus and method for tissue capture
First Claim
1. A tissue acquisition device for retrieving tissue samples from a patient, comprising:
- a cannula having a proximal end, a distal end, a longitudinal axis extending between the proximal and distal ends, and a tissue lumen extending along the longitudinal axis from the proximal end toward the distal end;
a distal electrode which has a lumen that is substantially aligned with the cannula tissue lumen and which is secured to the distal end of the cannula; and
at least two retractable electrodes extendable distally from the distal end of the cannula.
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Accused Products
Abstract
A tissue acquisition system includes electrodes that are energized by a radio frequency (RF) energy source. Retractable electrodes are energized and extended from a cannula and the cannula is advanced in the tissue to position the cannula near the target tissue site in a patient. The retractable electrodes are then retracted and a distal electrode cuts a tissue sample from the tissue site when the cannula is further advanced into the tissue. The retractable electrodes are then energized and extended from the cannula and the cannula is rotated to separate the tissue sample from the tissue site. The tissue sample is ejected through the cannula for collection by advancing a dilator.
418 Citations
26 Claims
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1. A tissue acquisition device for retrieving tissue samples from a patient, comprising:
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a cannula having a proximal end, a distal end, a longitudinal axis extending between the proximal and distal ends, and a tissue lumen extending along the longitudinal axis from the proximal end toward the distal end;
a distal electrode which has a lumen that is substantially aligned with the cannula tissue lumen and which is secured to the distal end of the cannula; and
at least two retractable electrodes extendable distally from the distal end of the cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
a RF energy generator capable of generating RF energy; and
a tissue acquisition device in accordance with claim 1, wherein the distal electrode and the at least two retractable electrodes of the tissue acquisition device are in electrical communication with the RF energy generator.
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15. The system in accordance with claim 14, further comprising a vacuum source in fluid communication with the cannula tissue lumen.
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16. The system in accordance with claim 14 wherein the at least two retractable electrodes comprise a pair of opposing retractable electrodes having a first configuration when retracted, a second configuration when extended in which the retractable electrodes extend distally of the distal electrode and cross the longitudinal axis of the cannula and an apex that extends radially farther from the longitudinal axis of the cannula than an outer surface of the cannula when in the second configuration.
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17. A method of sampling tissue from a patient, comprising:
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(a) providing a tissue acquisition device having;
a cannula having a proximal end, a distal end, a longitudinal axis extending between the proximal and distal ends, and a tissue lumen extending along the longitudinal axis from the distal end of the cannula;
a distal electrode which has a lumen that is substantially aligned with the cannula tissue lumen and which is secured to the distal end of the cannula; and
at least two retractable electrodes extendable distally from the distal end of the cannula;
p1 (b) inserting the cannula into target tissue of a patient with the distal electrode energized such that at least a portion of the target tissue enters the cannula tissue lumen;
(c) extending the at least two retractable electrodes;
(d) energizing the at least two retractable electrodes; and
(e) separating the target tissue within the cannula tissue lumen by rotating the cannula and the at least two retractable electrodes through the tissue of the patient with the at least two retractable electrodes energized. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification