Catheter handle with torque mechanism and valve relief component
A catheter includes a handle with torqueing and steering mechanisms. The torqueing mechanism includes a rotatable nosecone and a bearing coupled to the nosecone to be rotatable therewith. The bearing is concentrically disposed over a shaft of the catheter. The steering mechanism includes a rack coupled to the bearing to be slideable therewith and a pull wire having a proximal end attached to the bearing and a distal end attached to a distal portion of the shaft. Rotation of the nosecone causes an entire length of the shaft to rotate and axial movement of the rack tensions the pull wire to bend the distal portion of the shaft. A valve relief component is slidingly disposed over the shaft and is configured to dock onto the handle when not in use.
1. A system comprising:
an introducer sheath including a first hemostasis valve disposed therein; and
a catheter including
a handle;
a shaft distally extending from the handle;
a strain relief concentrically disposed over a portion of the shaft and distally extending from the handle;
a balloon disposed on a distal portion of the shaft;
a balloon-expandable prosthesis disposed over the balloon; and
a valve relief slidingly disposed over an outer surface of the shaft between a first position and a second position, wherein the valve relief includes a hub and a sheath, a proximal end of the valve relief sheath being coupled to the hub such that the valve relief sheath distally extends from the hub, the hub including a second hemostasis valve disposed therein that is configured to seal against the shaft when the shaft is disposed therethrough, the valve relief sheath in the first position being disposed directly over the balloon-expandable prosthesis to protect the balloon-expandable prosthesis during insertion into the introducer sheath, and the hub of the valve relief in the second position being disposed over a distal portion of the strain relief,
wherein the strain relief is configured to serve as a docking station for the valve relief when the valve relief is not disposed over the balloon-expandable prosthesis, and
wherein the valve relief sheath has a length that is configured to extend over an entire length of the balloon-expandable prosthesis when the balloon-expandable prosthesis is in a delivery configuration.
2. The system of claim 1 , wherein the balloon-expandable prosthesis is a valve replacement prosthesis.
3. The system of claim 1 , wherein the strain relief includes a distal portion that is configured to mate with the valve relief through an interference fit between the distal portion and the valve relief.
4. The system of claim 3 , wherein the distal portion of the strain relief includes a circumferential bump.
5. The system of claim 3 , wherein the distal portion of the strain relief includes a pair of tabs, each tab with a rounded tip.
6. The system of claim 3 , wherein the distal portion of the strain relief includes a plurality of prongs, each prong with a tang that extends radially inward at a distal end thereof.
7. The system of claim 3 , wherein the distal portion of the strain relief includes a pair of planar spring elements.
8. The system of claim 1 , wherein the strain relief is a tubular component and includes a radial flange at a proximal end thereof, the radial flange being attached to an interior of the handle.
9. The system of claim 1 , wherein when positioned over the balloon-expandable prosthesis, the valve relief reduces external forces that the balloon-expandable prosthesis experiences when loaded through the introducer sheath.
10. The system of claim 1 , wherein the strain relief is configured to mate with the valve relief through a magnetic coupling.
11. The system of claim 1 , wherein the handle includes a housing, a tubular component disposed within the housing and over the shaft, and a rack disposed within the housing and axially movable relative to the housing of the handle, and wherein the catheter further includes a pull wire having a proximal end attached to the tubular component and a distal end attached to a distal portion of the shaft, and wherein the tubular component is coupled to the rack such that the tubular component moves axially with the rack and is rotatable relative to the rack, and wherein axial movement of the rack tensions the pull wire to bend the distal portion of the shaft.