Articulating catheter for cryoablation with reduced diameter section
First Claim
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1. A cryogenically cooled apparatus for ablating tissue of a patient, comprising:
- a handle portion;
an elongated catheter extending distally from the handle, the elongated catheter being adapted to transmit a torque imparted by the handle;
a main shaft portion of the catheter having a substantially uniform diameter;
a deflectable segment at the distal end of the main shaft, the deflectable segment having a minimum diameter that is smaller than the diameter of the main shaft;
a tip portion disposed distally of the deflectable segment and having a diameter greater than the minimum diameter, the tip portion defining an expansion chamber for refrigerant fluid;
a resilient component adapted to define a preferred plane of deflection of the deflectable segment; and
an actuator connected to a distal portion of the elongated catheter, adapted to impart a curvature to the deflectable segment.
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Abstract
A catheter usable for cryogenic ablation of tissues is described. The catheter has a deflectable segment with a reduced diameter and a tip portion with a diameter greater than the reduced diameter. A resilient element allows for bending of the deflectable segment preferentially in one plane, and an actuator is used to control the bending of the deflectable segment.
63 Citations
26 Claims
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1. A cryogenically cooled apparatus for ablating tissue of a patient, comprising:
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a handle portion;
an elongated catheter extending distally from the handle, the elongated catheter being adapted to transmit a torque imparted by the handle;
a main shaft portion of the catheter having a substantially uniform diameter;
a deflectable segment at the distal end of the main shaft, the deflectable segment having a minimum diameter that is smaller than the diameter of the main shaft;
a tip portion disposed distally of the deflectable segment and having a diameter greater than the minimum diameter, the tip portion defining an expansion chamber for refrigerant fluid;
a resilient component adapted to define a preferred plane of deflection of the deflectable segment; and
an actuator connected to a distal portion of the elongated catheter, adapted to impart a curvature to the deflectable segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A deflectable catheter for surgical applications, comprising:
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a main shaft portion of the catheter having a substantially uniform diameter;
a deflectable segment of the catheter, the deflectable segment having a minimum diameter that is smaller than the diameter of the main shaft;
a tip portion of the catheter disposed distally from the deflectable segment, the tip portion having a diameter greater than the minimum diameter;
a resilient component adapted to define a preferred plane of deflection of the deflectable segment; and
an actuator linked to the tip portion of the catheter, adapted to impart a curvature to the deflectable segment. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A cryocatheter with a deflectable tip for use in surgical applications which comprises:
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a main shaft portion having a substantially constant first diameter (d1);
a tip portion having a substantially same first diameter (d1);
a deflectable segment interconnecting said main shaft portion with said tip portion, said deflectable segment having a distal end connected to said tip portion and a proximal end connected to said main shaft portion with a mid point therebetween, said deflectable segment having a second diameter (d2) at the midpoint wherein said second diameter is less than said first diameter (d1>
d2);
a resilient component mounted in said deflectable segment adapted to define a preferred plane of deflection for said deflectable segment; and
an actuator mounted on said main shaft portion and connected to said tip portion to move said tip portion through a range in the preferred plan of deflection between a first configuration wherein said tip portion is substantially coaxial with said main shaft portion and a second configuration wherein said tip portion is approximately parallel with said main shaft portion.
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Specification