Catheter with atraumatic tip
First Claim
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1. A medical device comprising:
- a shaft comprising an axis and comprising a first, proximal segment and a second, distal segment, wherein the second, distal segment includes a proximal end and a distal end,a first electrode disposed on the distal end of the second, distal segment;
a second, ring electrode disposed on the second, distal segment, the second electrode being disposed proximally of the first electrode and disposed proximally of a portion of the shaft of the second, distal segment;
a third, ring electrode disposed on the second, distal segment, the third electrode being disposed proximally of the second electrode, the first, second, and third electrodes comprising electrically conductive material;
wherein the first segment is configured to buckle upon application of a first critical force thereto; and
wherein the second segment includes an outer surface and an inner surface and the second segment is configured to buckle upon application of a second critical force thereto, wherein the second critical force is lower than the first critical force; and
a coil disposed radially inwardly of the inner surface of the second segment configured to maintain an amount of force transmitted by the second segment to tissue contacting the second segment after an application of the second critical force to the second segment, the coil being disposed between the second, ring electrode and the third, ring electrode, wherein the amount of force transmitted by the second segment to the tissue after buckling is limited to the second critical force as the device is advanced over a distance toward the tissue.
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Abstract
A medical device is provided comprising a shaft comprising a first segment and a second segment. The first segment is configured to buckle upon application of a first critical force. The second segment includes an outer surface and an inner surface and is configured to buckle upon application of a second critical force. The second critical force is lower than the first critical force. The medical device further comprises a coil disposed radially inwardly of the inner surface of the second segment.
62 Citations
20 Claims
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1. A medical device comprising:
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a shaft comprising an axis and comprising a first, proximal segment and a second, distal segment, wherein the second, distal segment includes a proximal end and a distal end, a first electrode disposed on the distal end of the second, distal segment; a second, ring electrode disposed on the second, distal segment, the second electrode being disposed proximally of the first electrode and disposed proximally of a portion of the shaft of the second, distal segment; a third, ring electrode disposed on the second, distal segment, the third electrode being disposed proximally of the second electrode, the first, second, and third electrodes comprising electrically conductive material; wherein the first segment is configured to buckle upon application of a first critical force thereto; and wherein the second segment includes an outer surface and an inner surface and the second segment is configured to buckle upon application of a second critical force thereto, wherein the second critical force is lower than the first critical force; and a coil disposed radially inwardly of the inner surface of the second segment configured to maintain an amount of force transmitted by the second segment to tissue contacting the second segment after an application of the second critical force to the second segment, the coil being disposed between the second, ring electrode and the third, ring electrode, wherein the amount of force transmitted by the second segment to the tissue after buckling is limited to the second critical force as the device is advanced over a distance toward the tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A medical device comprising:
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a shaft comprising an axis and comprising a first, proximal segment and a second, distal segment, a first ablation electrode disposed on a distal end of the second segment of the shaft; a second, ring electrode disposed on the second, distal segment, the second electrode being disposed proximally of the first, ablation electrode and disposed proximally of a portion of the shaft of the second, distal segment; a third, ring electrode disposed on the second, distal segment, the third electrode being disposed proximally of the second electrode; a fourth, ring electrode disposed on the second, distal segment, the fourth electrode being disposed proximally of the third electrode, the first, second, third, and fourth electrodes comprising electrically conductive material; a coil disposed radially inwardly of an inner surface of the second segment, the coil being disposed between the second, ring electrode and the third, ring electrode; wherein the first segment is configured to buckle upon application of a first critical force thereto; wherein the second segment is configured to buckle upon application of a second critical force thereto, wherein the second critical force is lower than the first critical force; and wherein the coil is configured to maintain an amount of force transmitted by the second segment to tissue contacting the second segment after application of the second critical force to the second segment so as to provide a transmitted amount of force between (i) a first amount in a range of at least about 20 grams-force to about 50 grams-force required to create a transmural lesion during ablation therapy using the ablation electrode and (ii) a second, minimum amount in the range of about 40 grams-force to about 100 grams-force that can cause perforation of the tissue, wherein the first amount is less than the second, minimum amount, and wherein the amount of force transmitted by the second segment to the tissue after buckling is limited to the second critical force as the device is advanced over a distance toward the tissue. - View Dependent Claims (18)
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19. A medical device comprising:
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a shaft comprising an axis and comprising a first, proximal segment and a second, distal segment, wherein the second, distal segment includes a proximal end and a distal end, a first electrode disposed on the distal end of the second, distal segment; a second, ring electrode disposed on the second, distal segment, the second electrode being disposed proximally of the first electrode and disposed proximally of a portion of the shaft of the second, distal segment; a third, ring electrode disposed on the second, distal segment, the third electrode being disposed proximally of the second electrode, the first, second, and third electrodes comprising electrically conductive material, wherein the first segment is configured to buckle upon application of a first critical force thereto; and wherein the second segment is configured to buckle upon application of a second critical force thereto, wherein the second critical force is lower than the first critical force; and means in said second segment between the second, ring electrode and the third, ring electrode for maintaining an amount of force transmitted by the second segment to tissue contacting the second segment after an application of the second critical force to the second segment, wherein the amount of force transmitted by the second segment to the tissue after buckling is limited to the second critical force as the device is advanced over a distance toward the tissue. - View Dependent Claims (20)
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Specification