Transseptal crossing system for single pass large bore access
A single pass, large bore transseptal crossing catheter system is disclosed. An elongate, flexible tubular body has a proximal end, a distal end and an electrically conductive sidewall defining a central lumen. An insulation layer surrounds the sidewall and leaves exposed a first distal electrode tip. An inner conductive wire is provided, having a second distal electrode tip. The inner wire is axially movably extendable through the central lumen. A tubular insulation layer is provided in between the wire and the electrically conductive sidewall.
1. A single pass, large bore transseptal crossing catheter system, comprising: an elongate, flexible tubular body having a proximal end, a distal end, and an electrically conductive sidewall defining a central lumen, the flexible tubular body being configured to be maneuverable through a patient's vasculature; a first insulation layer surrounding the electrically conductive sidewall and leaving exposed a first distal electrode tip being positioned on a distally facing end surface of the electrically conductive sidewall; an inner conductive wire having a second distal electrode tip, axially movably extendable through the central lumen; a second tubular insulation layer in between the inner conductive wire and the electrically conductive sidewall, wherein the second tubular insulation layer is separate from the first insulation layer; and wherein the second tubular insulation layer is disposed on an inner diameter of the electrically conductive sidewall.
2. The single pass system as in claim 1 , wherein the first distal electrode tip comprises an annular conductive surface at the distal end of the tubular body.
3. The single pass system as in claim 2 , wherein the second distal electrode tip is concentrically extendable through the annular conductive surface.
4. The single pass system as in claim 1 , wherein the first distal electrode tip comprises at least one distal projection.
5. The single pass system as in claim 1 , wherein the first distal electrode tip comprises a scalloped distal surface.
6. The single pass system as in claim 2 , wherein the second distal electrode tip comprises a smooth, hemispherical surface.
7. The single pass system as in claim 1 , further comprising an annular lumen extending between the tubular body and the inner conductive wire.
8. The single pass system as in claim 1 , wherein the inner conductive wire includes a central lumen.
9. The single pass system as in claim 1 , wherein the electrically conductive sidewall comprises a stainless steel tube.
10. The single pass system as in claim 4 , comprising at least four distal projections.
11. The single pass system as in claim 1 , wherein the tubular body has an outside diameter of about 0.050 inches.
12. The single pass system as in claim 11 , wherein the inner conductive wire has an outside diameter of about 0.035 inches.
13. The single pass system as in claim 1 , wherein the tubular body comprises an outside diameter of at least about 0.040 inches.
14. The single pass system as in claim 1 , wherein the tubular body comprises an outside diameter of at least about 0.045 inches.
15. The single pass system as in claim 1 , having sufficient structural integrity to guide a large bore catheter transvascularly through a septal wall and into a left atrium of a heart without breaking.
16. The single pass system as in claim 13 , in which no part of the electrically conductive sidewall is a braided or woven wire.
17. The single pass system as in claim 1 , wherein the second distal electrode tip is configured to extend beyond the tubular insulation layer.
18. The single pass system as in claim 1 , wherein the second distal electrode tip is configured to contact and ablate tissue.
19. The single pass system as in claim 1 , wherein the inner conductive wire is flexible.
20. The single pass system as in claim 1 , wherein the inner conductive wire is configured to be withdrawn from the central lumen.