Systems and methods for medical device advancement and rotation
View Patent ↗A system for moving an elongate medical device has at least one drive element for engaging and moving an elongate medical device. Various embodiments provide for moving the separate inner and outer elements of a telescoping medical device. Some systems also provide for the rotation of a rotatable distal element on a rotatable medical device or the rotation of extension element in a telescoping medical device.
1. A drive unit for remotely controlling a motion of a catheter and associated sheath, the drive unit comprising:
first and second motion systems having first and second supports;
a catheter mover for engaging a catheter, mounted on the second support;
a sheath mover for engaging a sheath that surrounds the catheter, mounted on the second support, the sheath mover being movable to advance and retract the sheath; and
a roller being rotatable;
the catheter mover and sheath mover being movable relative to the supports for coordinated advancement and retraction of the catheter and sheath; the catheter mover being movable relative to the sheath mover for advancement and retraction of the catheter relative to the sheath, and the roller being rotatable for rotation of the sheath.
2. The drive unit according to claim 1 further comprising a catheter roller on the catheter mover, the catheter roller being rotatable to rotate the catheter.
3. The drive unit according to claim 1 , wherein the catheter mover comprises at least one drive wheel and the sheath mover comprises at least one drive wheel.
4. The drive unit according to claim 3 , wherein the catheter mover and sheath mover further comprise a second wheel.
5. The drive unit according to claim 1 , wherein the catheter mover and sheath mover further include a smooth support along which the catheter and sheath slide.
6. The drive unit according to claim 1 , wherein the sheath and catheter comprise an outer sheath that surrounds an inner catheter, and the roller is configured to rotate the inner catheter and outer sheath.
7. The drive unit according to claim 6 , wherein the sheath mover engages the outer sheath sufficiently to cause the outer sheath to frictionally engage the inner catheter so that the sheath mover can drive both the sheath and catheter.
8. The drive unit according to claim 7 , wherein the catheter mover engages the catheter sufficiently to overcome a friction between the inner catheter and outer sheath to drive the inner catheter independently of the sheath.
9. The drive according to claim 8 , wherein the sheath mover retains the outer sheath in position when advancing the inner catheter.
10. The device unit according to claim 8 , further comprising a base on which the first and second motion systems are disposed.