In-vivo visualization system
Several embodiments of the present invention are generally directed to medical visualization systems that comprise combinations of disposable and reusable components, such as catheters, functional handles, hubs, optical devices, etc. Other embodiments of the present invention are generally directed to features and aspects of an in-vivo visualization system that comprises an endoscope having a working channel through which a catheter having viewing capabilities is routed. the catheter may obtain viewing capabilities by being constructed as a vision catheter or by having a fiberscope or other viewing device selectively routed through one of its channels. The catheter is preferably of the steerable type so that the distal end of the catheter may be steered from its proximal end as it is advanced with the body. A suitable use for the in-vivo visualization system includes but is not limited to diagnosis and/or treatment of the duodenum, and particularly the biliary tree.
1. A catheter handle for steering a catheter shaft having a proximal end and a distal end and at least two elongate steering elements, each steering element having a distal end region secured at or near the distal end of the catheter shaft, and each steering element having a proximal end, the catheter handle comprising:
a catheter handle housing attached to the proximal end of the catheter shaft;
a steering mechanism attached to the proximal end of each of the steering elements and moveable from a first position to a second position to deflect the distal end of the catheter shaft, the steering mechanism including:
a first control knob configured to rotate about a first axis; and
a second control knob configured to rotate about the first axis; and
a locking mechanism moveable between an unlocked position and a locked position to cause at least one member fixedly attached to at least one of the two elongate steering elements to translate along the first axis, thereby restricting movement of the steering mechanism when in the locked position.
2. The catheter handle of claim 1 , wherein rotation of either of the first control knob and the second control knob deflects the distal end of catheter shaft.
3. The catheter handle of claim 2 , wherein the first control knob is connected to a first pulley by a first shaft, and the second control knob is connected to a second pulley by a second shaft; and
wherein the first shaft is positioned inside of the second shaft.
4. The catheter handle of claim 3 , wherein the steering mechanism further comprises a plate positioned between the first pulley and the second pulley;
wherein the plate isolates rotational movement between the first pulley and the second pulley; and
wherein the first pulley and the second pulley frictionally engage the plate when the locking mechanism is in the locked position.
5. The catheter handle of claim 3 , wherein the locking mechanism includes a lever rotatable about the first axis.
6. The catheter handle of claim 5 , wherein the locking mechanism further comprises a lever member connected to the lever, and a pulley member positioned adjacent to the second pulley, and
wherein rotational movement of the lever causes translational movement of the pulley member.
7. The catheter handle of claim 2 , wherein rotation of the first control knob deflects the distal end of the catheter shaft along a first plane; and
wherein rotation of the second control knob deflects the distal end of the catheter shaft in a second plane, the second plane being perpendicular to the first plane.
8. The catheter handle of claim 6 , wherein the lever member comprises a first flange including a first cam profile that annularly extends around a perimeter of the first flange;
wherein the pulley member comprises a second flange including a second cam profile that annularly extends around a perimeter of the second flange; and
wherein the first cam profile is configured to mate with the second cam profile.
9. The catheter handle of claim 3 , wherein the catheter handle housing comprises a third shaft inside the first shaft; and
wherein the first shaft rotates with respect to and around a longitudinal axis of the third shaft.