Handle assemblies for intravascular treatment devices and associated systems and methods
The present disclosure comprises handle assemblies for intravascular treatment devices. In one embodiment, a handle assembly comprises an actuator for deflecting a distal region of an intravascular treatment device. In one embodiment, a handle assembly comprises a rotator for rotating an intravascular treatment device independently of the handle assembly. In one embodiment, a handle assembly comprises a rotation limiting element for limiting independent rotation of an intravascular treatment device relative to the handle assembly. Methods and systems for intravascular delivery, deflection and placement of an intravascular treatment device via a handle assembly of the present invention are also provided.
1. A handle assembly, comprising:
a housing;
a rotator coupled to a proximal region of an elongated flexible shaft extending rotatably along an axis and having a deflectable distal region configured for intravascular delivery to a blood vessel of a human patient, wherein the rotator is configured to rotate the entire elongated flexible shaft through the proximal region without rotating the housing;
a rotational limiting element configured to prevent rotation of the elongated flexible shaft and the rotator beyond a predetermined number of rotations; and
an actuator coupled to a carrier, which in turn is coupled to a control wire extending within a lumen of the elongated flexible shaft to the deflectable distal region such that the actuator is operatively connected to the deflectable distal region of the elongated flexible shaft;
wherein the actuator is configured to rotate relative to the housing, and wherein the carrier is coupled to the actuator in a manner that converts rotation of the actuator into translation of the carrier, and
the actuator is further configured to proximally translate the carrier relative to the housing to apply tension to the control wire and thereby deflect the deflectable distal region of the elongated flexible shaft.
2. The handle assembly of claim 1 wherein a coupling of the actuator and the carrier comprises a cam configured to converts rotation of the actuator into translation of the carrier.
3. The handle assembly of claim 1 wherein the actuator is coupled to the carrier within the housing.
4. The handle assembly of claim 1 , further comprising a connector coupling a thermal element at the deflectable distal region of the elongated flexible shaft to a thermal energy source for delivery of thermal energy to the thermal element.
5. The handle assembly of claim 1 , further comprising a connector coupled to at least one sensor at the deflectable distal region of the elongated flexible shaft for receipt of a signal transmitted by the sensor.
6. The handle assembly of claim 1 wherein the rotational limiting element is configured to limit rotation of the elongated flexible shaft to a predetermined number of rotations in the range of about 1 to 3 rotations.
7. The handle assembly of claim 1 wherein the rotational limiting element is configured to prevent rotation of the elongated flexible shaft beyond about 2 rotations.
8. The handle assembly of claim 1 wherein the rotational limiting element comprises a geometric constraint to continued rotation of the rotator that prevents rotation of the elongated flexible shaft beyond the predetermined number of rotations.
9. The handle assembly of claim 8 wherein the geometric constraint comprises an abutment of the rotator and the housing.
10. The handle assembly of claim 9 wherein the abutment further comprises at least one rotation limiter ring positioned between the rotator and the housing and configured to extend rotation of the elongated flexible shaft to the predetermined number of rotations.
11. The handle assembly of claim 9 wherein the abutment further comprises a ball positioned within a fixed length helical channel formed between the rotator and housing.
12. The handle assembly of claim 1 wherein the housing further comprises a conforming surface that substantially conforms to a surface on which the handle assembly is placed during use.
13. The handle assembly of claim 1 wherein the elongated flexible shaft further comprises an intravascular treatment device configured for delivery to a renal artery of the patient.