Gear drive mechanism for heart valve delivery apparatus
A prosthetic valve delivery apparatus can comprise a handle, a gearbox, an input torque shaft and a plurality of output torque shafts. The input torque shaft can extend distally from the handle and can have a distal end portion operatively connected to the gearbox. The output torque shafts can be operatively connected to and extend distally from the gearbox. Rotation of the input torque shaft can cause rotation of the output torque shafts via the gear box.
1. A prosthetic valve delivery apparatus, comprising:
a handle;
a gearbox;
an input torque shaft extending distally from the handle and having a distal end portion operatively connected to the gearbox; and
a plurality of output torque shafts operatively connected to and extending distally from the gearbox, wherein rotation of the input torque shaft causes rotation of the output torque shafts via the gear box; and
wherein the gearbox comprises:
a drive gear operatively connected to and driven by the input torque shaft;
a plurality of driven gears configured to be driven by the drive gear, wherein each driven gear is operatively connected to and rotates one of the output torque shafts; and
the prosthetic valve delivery apparatus further comprising a prosthetic valve;
wherein said prosthetic valve comprises a radially expandable and compressible frame and a plurality of actuators configured to radially expand and compress the frame, wherein each output torque shaft is releasably coupled to a screw of an actuator to transfer rotational motion from the torque shaft to the screw, whereby rotation of the screws causes radial expansion or compression of the frame.
2. The prosthetic valve delivery apparatus of claim 1 , further comprising a motor disposed in the handle, the motor being operatively connected to a proximal end portion of the input torque shaft, wherein actuation of the motor results in rotation of the input torque shaft.
3. The prosthetic valve delivery apparatus of claim 1 , wherein the drive gear comprises an internal gear and the driven gears comprise pinion gears positioned inside of the internal gear.
4. The prosthetic valve delivery apparatus of claim 1 , wherein the drive gear is mounted on the distal end portion of the input torque shaft and each driven gear is mounted on one of the output torque shafts.
5. The prosthetic valve delivery apparatus of claim 1 , wherein the drive gear has teeth that mesh with teeth of each driven gear.
6. The prosthetic valve delivery apparatus of claim 1 , wherein the gearbox further comprises at least one idler gear configured to transfer rotational motion from the drive gear to one of the driven gears.
7. The prosthetic valve delivery apparatus of claim 1 , wherein the plurality of output torque shafts comprises three output torque shafts.
8. The prosthetic valve delivery apparatus of claim 1 , wherein each output torque shaft comprises a connector at its distal end configured to form a releasable connection with an actuator on a prosthetic heart valve.
9. The prosthetic valve delivery apparatus of claim 1 , wherein the input torque shaft defines a central rotation axis collinear with a central longitudinal axis of the delivery apparatus, and each output torque shaft defines a rotation axis offset from the central longitudinal axis of the delivery apparatus.
10. The prosthetic valve delivery apparatus of claim 1 , wherein the input torque shaft extends at least the majority of the length of the delivery apparatus.