Valve delivery tool
A system includes a medical device for implanting in a valve of a subject, the implantable medical device having a self-expanding frame; and a holder configured to retain the frame of the implantable medical device in a constricted configuration and to control expansion of the frame. The holder has a controllably constrictable and expandable loop, wherein the loop is disposed about at least a portion of the self-expanding frame such that constriction or expansion of the first loop controls constriction or expansion of the frame.
1 . A prosthetic valve delivery device comprising:
a handle coupled to a rotary shaft;
a grasping member coupled to the rotary shaft, the grasping member defining a recess within which a prosthetic valve is configured to be received, the rotary shaft configured to rotate in a first direction, such that a diameter of the recess defined by the grasping member decreases to radially compress the prosthetic valve, and in a second direction, such that the diameter of the recess defined by the grasping member increases to allow the prosthetic valve to radially expand; and
a stationary shaft coupled to the handle,
wherein the grasping member comprises one or more coil arms, wherein the one or more coil arms are attached to the rotary shaft and define the recess within which the prosthetic valve is configured to be received, and wherein rotation of the rotary shaft in the first direction twists the one or more coil arms about the stationary shaft to reduce the diameter of the recess, and wherein rotation of the rotary shaft in the second direction untwists the one or more coil arms from the stationary shaft to increase the diameter of the recess.
2 . The prosthetic valve delivery device of claim 1 , further comprising a rotatable actuator on the handle and coupled to the rotary shaft, wherein the rotatable actuator is rotatable relative to the handle, and wherein rotation of the rotatable actuator in the first direction causes the rotary shaft to rotate in the first direction, and rotation of the rotatable actuator in the second direction causes the rotary shaft to rotate in the second direction.
3 . The prosthetic valve delivery device of claim 2 , wherein the grasping member comprises one or more posts, wherein the one or more posts are attached to the stationary shaft.
4 . The prosthetic valve delivery device of claim 3 , wherein the one or more coil arms comprise a first coil arm and a second coil arm, the first coil arm attached to the rotary shaft at a first circumferential location of the rotary shaft, and the second coil arm attached to the rotary shaft at a second circumferential location of the rotary shaft that is spaced apart from the first circumferential location.
5 . The prosthetic valve delivery device of claim 3 , wherein the one or more posts extend outwardly from the stationary shaft such that the prosthetic valve is configured to abut the one or more posts as the prosthetic valve receives the stationary shaft within a lumen of the prosthetic valve.