Intravascular ultrasound systems, catheters, and methods with a manual pullback arrangement
A catheter assembly for an ultrasound system can include an integrated pullback arrangement. For example, the catheter assembly can include a telescoping pullback section having a first telescope, a second telescope, a distal grip coupling one of the first or second telescope to the distal sheath of the distal section, and a proximal grip coupled to another of the first or second telescope so that the first telescope can be retracted into the second telescope and a sensor to determine a position of the first telescope. Another example includes the sensor and a pullback slider arrangement having a housing defining a slit, a coupler disposed within the housing, and a slider handle extending through the slit and coupled to the coupler. In another example, the coupler and housing can be gripped and slid relative to each other.
1. A catheter assembly for an ultrasound system, the catheter assembly comprising:
a distal section comprising a distal sheath;
a proximal extension comprising a proximal sheath;
a telescoping pullback section including a first telescope and a second telescope;
a pullback slider arrangement disposed between the distal section and the proximal extension, the pullback slider arrangement comprising a housing defining a slit, a coupler disposed within the housing, and a slider handle coupled to the coupler within the housing and extending through the slit such that a portion of the slider handle is disposed along an exterior of the housing, wherein the slider handle and the coupler can be manually slid along the slit in the housing;
a sensor disposed within the housing of the pullback slider arrangement to determine a position of the coupler within the housing and to determine the position of the first telescope relative to the second telescope;
an elongated, rotatable driveshaft having a proximal end and a distal end and extending along the distal section, the proximal extension, and the pullback slider arrangement, wherein the proximal end is configured and arranged for coupling to a motordrive for rotating the driveshaft, wherein the coupler of the pullback slider arrangement is coupled to the rotatable driveshaft to manually move the rotatable driveshaft backwards and forwards by moving the slider handle;
wherein the rotatable driveshaft is coupled to the first telescope;
wherein the rotatable driveshaft includes a proximal driveshaft coupled to a proximal end region of the coupler, an intermediate shaft coupled to a distal end region of the coupler, and a distal driveshaft coupled to the intermediate shaft;
an imaging device coupled to the distal end of the driveshaft with rotation of the driveshaft causing a corresponding rotation of the imaging device, the imaging device comprising at least one transducer configured and arranged for transforming applied electrical signals to acoustic signals and also for transforming received echo signals to electrical signals; and
at least one conductor extending along the distal section, the proximal extension, and the coupler and coupled to the imaging device for carrying the electrical signals.
2. The catheter assembly of claim 1 , wherein the housing of the pullback slider arrangement comprises a control button, wherein actuation of the control button provides a signal related to a pullback procedure.
3. The catheter assembly of claim 1 , wherein the sensor is an optical, resistive, capacitive, inductive, or magnetic sensor.
4. The catheter assembly of claim 1 , wherein the sensor is a potentiometer.
5. The catheter assembly of claim 1 , wherein the sensor is a capacitive sensor and comprises a first plate and a second plate that is coupled to the coupler of the pullback slider arrangement so that capacitance between the first and second plates varies with position of the coupler.
6. The catheter assembly of claim 1 , wherein the sensor is an inductive sensor and comprises a coil and a magnetic material that is coupled to the coupler of the pullback slider arrangement and moves with the coupler so that inductance of the coil varies with position of the coupler.
7. The catheter assembly of claim 1 , wherein the sensor is an optical sensor coupled to the coupler and the pullback slider arrangement comprises a set of alternating stripes of different colors detectable by the optical sensor and disposed in the housing to determine a position of the coupler.
8. The catheter assembly of claim 1 , wherein the sensor is a magnetic sensor coupled to the coupler and the pullback slider arrangement comprises a set of alternating stripes of magnetic materials detectable by the magnetic sensor and disposed in the housing to determine a position of the coupler.
9. The catheter assembly of claim 1 , wherein the slider handle comprises at least one control button, wherein actuation of one of the at least one control button provides a signal related to a pullback procedure.
10. The catheter assembly of claim 1 , wherein the sensor is a magnetic sensor coupled to the housing and the pullback slider arrangement comprises a set of alternating stripes of magnetic materials detectable by the magnetic sensor and disposed on the coupler to determine a position of the coupler.