Catheter with bifurcated, collapsible tip for sensing and ablating
View Patent ↗A sensing and ablation electrode includes bifurcated sensing limbs separated by an ablation web. The electrode is disposed on the distal end of a catheter. The sensing limbs each support an array of sensors that are individually wired for mapping and post ablation efficacy testing. The web includes a pair of pliable membranes that define a lumen and are adapted to collapse the cross-section of the electrode. One membrane defines a plurality of apertures for dispersing a conductive fluid medium as a virtual electrode. The sensors and the apertures all lie within substantially the same plane.
1. A cardiac sensing and ablation device for intravascular insertion in a patient, the cardiac sensing and ablation device comprising
a bifurcated sensing portion further comprising
a first sensing limb;
a first set of a plurality of sensors disposed upon the first sensing limb;
a second sensing limb, parallel with but spaced apart from the first sensing limb; and
a second set of a plurality of sensors disposed upon the second sensing limb; and
an ablation web disposed between the first sensing limb and the second sensing limb, the ablation web further comprising an electrode, wherein
the first set of sensors, the second set of sensors, and the electrode lie substantially within the same curvilinear plane.
2. The cardiac sensing and ablation device of claim 1 , wherein
the bifurcated sensing portion and the ablation web assume a pre-shaped curved form;
the first set of sensors is positioned on a surface of the first sensing limb defining an outer surface of the curved form; and
the second set of sensors is positioned on a surface of the second sensing limb defining the outer surface of the curved form.
3. The cardiac sensing and ablation device of claim 1 , wherein the ablation web further comprises a pliable web disposed to bend longitudinally parallel to the first sensing limb and the second sensing limb providing variable spacing between the first sensing limb and the second sensing limb.
4. The cardiac sensing and ablation device of claim 1 further comprising a plurality of lead wires, wherein each lead wire is coupled with a respective one of the first set of sensors or a respective one of the second set of sensors.
5. The cardiac sensing and ablation device of claim 1 , wherein each of the first sensing limb and the second sensing limb comprise a support structure covered by a respective sleeve.
6. The cardiac sensing and ablation device of claim 5 , wherein the support structure comprises at least one conductor coupled with at least one of the first set of sensors or one of the second set of sensors.
7. A cardiac sensing and ablation system comprising
a catheter; and
a sensing array and ablation electrode disposed on a distal end of the catheter, the sensing and ablation electrode further comprising
a first sensing limb;
a first set of a plurality of sensors disposed upon the first sensing limb;
a second sensing limb, parallel with but spaced apart from the first sensing limb; and
a second set of a plurality of sensors disposed upon the second sensing limb;
a first membrane disposed between the first sensing limb and the second sensing limb, wherein
the first membrane defines a plurality of apertures adapted to disperse a fluid; and
the first set of sensors, the second set of sensors, and the plurality of apertures lie substantially within the same curvilinear plane;
a second membrane disposed between the first sensing limb and the second sensing limb, wherein
an electrode lumen is defined between the first membrane, the second membrane, the first sensing limb, and the second sensing limb; and
an electrode conductor positioned between the first membrane and the second membrane adjacent the plurality of apertures.
8. The cardiac sensing and ablation system of claim 7 further comprising
a shape retention wire positioned within the sensing array and ablation electrode that assumes a curved form when not otherwise restrained and causes the sensing array and ablation electrode to assume a ribbon-like form following the curved form.
9. The cardiac sensing and ablation system of claim 8 , wherein
the first sensing limb is symmetric to and instantaneously parallel to the second sensing limb;
the first set of sensors is positioned on a surface of the first sensing limb, the position of each of the sensors in the first set defining an outer surface of the ribbon-like form;
the second set of sensors is positioned on a surface of the second sensing limb, the position of each of the sensors in the second set defining the outer surface of the ribbon-like form; and
each of the apertures in the first membrane is immediately adjacent to a respective line tangential to both the surface of the first sensing limb defining the outer surface of the ribbon-like form and the surface of the second sensing limb defining the outer surface of the ribbon-like form.
10. The cardiac sensing and ablation system of claim 8 , wherein the shape retention wire comprises a shape memory material.
11. The cardiac sensing and ablation system of claim 7 , wherein
the first sensing limb further comprises a first coil covered by a first sleeve; and
the second sensing limb further comprises a second coil covered by a second sleeve.
12. The cardiac sensing and ablation system of claim 11 , wherein each of the sensors in the first set is positioned on a respective winding of the coil.
13. The cardiac sensing and ablation system of claim 11 , further comprising
a first set of a plurality of lead wires positioned within the first coil, wherein each lead wire of the first set is coupled with a respective one of the first set of sensors; and
a second set of a plurality of lead wires positioned within the second coil, wherein each lead wire of the second set is coupled with or a respective one of the second set of sensors.
14. The cardiac sensing and ablation system of claim 11 , wherein at least one of the first coil and the second coil is further a shape retention wire and assumes a curved form when not otherwise restrained and causes the sensing array and ablation electrode to assume a ribbon-like form following the curved form.
15. The cardiac sensing and ablation system of claim 14 , wherein
the first sensing limb is symmetric to and instantaneously parallel to the second sensing limb;
the first set of sensors is positioned on a surface of the first sensing limb, the position of each of the sensors in the first set defining an outer surface of the ribbon-like form;
the second set of sensors is positioned on a surface of the second sensing limb, the position of each of the sensors in the second set defining the outer surface of the ribbon-like form; and
each of the apertures in the first membrane is immediately adjacent to a respective line tangential to both the surface of the first sensing limb defining the outer surface of the ribbon-like form and the surface of the second sensing limb defining the outer surface of the ribbon-like form.
16. The cardiac sensing and ablation system of claim 7 , wherein
the first sensing limb further comprises a first braided wire tube covered by a first sleeve; and
the second sensing limb further comprises a second braided wire tube covered by a second sleeve.
17. The cardiac sensing and ablation system of claim 16 , further comprising
a first set of a plurality of lead wires woven within the first braided wire tube, wherein each lead wire of the first set is coupled with a respective one of the first set of sensors; and
a second set of a plurality of lead wires woven within the second braided wire tube, wherein each lead wire of the second set is coupled with or a respective one of the second set of sensors.
18. The cardiac sensing and ablation system of claim 7 , further comprising
a sheath surrounding the catheter, the sheath defining a lumen of a certain cross-sectional area at a distal tip of the sheath, wherein
when the sensing array and ablation electrode is not housed within the sheath, a distance between a first outer surface of the first sensing limb and a second outer surface of the second sensing limb is greater than a greatest diameter of the certain cross-sectional area.
19. The cardiac sensing and ablation system of claim 7 , wherein the first membrane further comprises a first pliable web and the second membrane further comprises a second pliable web, wherein each of the first membrane and the second membrane is disposed to bend longitudinally parallel to the first sensing limb and the second sensing limb providing variable spacing between the first sensing limb and the second sensing limb.
20. The cardiac sensing and ablation system of claim 19 , wherein
the first membrane is disposed to bend to form a first convex surface in a first direction;
the second membrane is disposed to bend to form a second convex surface in a second direction; and
the first direction is opposite the second direction.
21. The cardiac sensing and ablation system of claim 7 , wherein the plurality of apertures comprises an array of pairs of apertures and the electrode conductor is positioned between each pair of apertures.
22. The cardiac sensing and ablation system of claim 21 , wherein each pair of apertures fluidally connects the electrode lumen to a respective dispersion port formed as a recess in an outer wall of the first membrane.
23. The cardiac sensing and ablation system of claim 22 , wherein a diameter of each dispersion port is greater than a separation distance between a respective pair of apertures.
24. A bifurcated, collapsible electrode for intravascular insertion in a patient, the electrode comprising
a first limb;
a plurality of sensors disposed upon the first limb;
a second limb, parallel with but spaced apart from the first limb;
an electrode supported by the second sensing limb; and
a flexible membrane connected with and disposed between the first limb and the second limb, wherein
the plurality of sensors and the electrode lie substantially within the same curvilinear plane.
25. The bifurcated, collapsible electrode of claim 24 , wherein
the first limb and the second limb assume a curved form;
the plurality of sensors is positioned on a surface of the first limb and defines an outer surface of the curved form; and
a tissue contacting portion of the electrode is positioned on a surface of the second limb defining the outer surface of the curved form.
26. The bifurcated, collapsible electrode of claim 24 , wherein the flexible membrane is disposed to bend longitudinally parallel to the first limb and the second limb providing variable spacing between the first limb and the second limb.
27. The bifurcated, collapsible electrode of claim 24 , wherein
the second limb comprises an outer wall defining a lumen for transporting a conductive fluid medium;
the outer wall defines at least one aperture fluidally connected with the lumen; and
an electrode wire is disposed within the lumen of the second limb.