Handle assemblies for intravascular treatment devices and associated systems and methods

A system for intravascular treatment, the system comprising:

• an elongated shaft extending along an axis, the elongated shaft comprising a proximal end region and a deflectable distal end region with a thermal element;
• a thermal energy source;
• a handle assembly comprising a housing, a rotator coupled to the proximal end region of the elongated shaft, an actuator operatively connected to the deflectable distal end region of the elongated shaft, and a connector that connects the thermal element to the thermal energy source for delivery of thermal energy to the thermal element,
• wherein the actuator is configured to deflect the deflectable distal region of the elongated shaft,
• wherein the rotator is configured to rotate the elongated shaft about the axis without rotating the housing, and
• wherein the handle assembly comprises a rotational limiting element configured to prevent rotation of the elongated shaft beyond a predetermined number or rotations.

A method for intravascular treatment within a patient, the method comprising:

• percutaneously delivering a deflectable distal end region of an elongated shaft having a thermal element to an intravascular treatment site by translating a handle assembly coupled to a proximal end region of the elongated shaft external to the patient;
• manipulating an actuator of the handle assembly to deflect the distal end region of the elongated shaft to position the thermal element in contact with a vessel wall at the intravascular treatment site;
• rotating a rotator of the handle assembly to rotate the elongated shaft without rotating a housing of the handle assembly;
• preventing rotation of the elongated shaft beyond a predetermined number or rotations via a rotational limiting element of the handle assembly;
• and
• delivering energy through the handle assembly to the thermal element.