Transcatheter prosthetic heart valve delivery system with funnel recapturing feature and method
A delivery device for percutaneously deploying a stented prosthetic heart valve. The device includes a delivery capsule and a recapture sheath. The capsule is configured to compressively retain the prosthesis. The recapture sheath includes a funnel segment having a plurality of circumferentially spaced runners and a polymer overlay. The runners are attached to a shaft and terminate at a distal tip. The overlay surrounds the runners, and is bonded to the shaft but not to at least the tips. The funnel segment is transitionable from a normal condition to an expanded condition forming a funnel shape with a distally increasing diameter, and self-transitionable back toward the normal condition. The funnel segment facilitates sliding of the capsule over a partially deployed region of the prosthesis as part of a recapturing operation. The runners provide columnar strength, with the overlay controlling a shape of the funnel segment.
1. A method of deploying a stented prosthetic heart valve to an implantation site, the method comprising:
receiving a delivery device loaded with a radially expandable prosthetic heart valve having a stent frame to which a valve structure is attached, the delivery device including a delivery sheath capsule containing the prosthetic heart valve in a compressed arrangement over an inner shaft assembly in a delivery state of the device, and a recapture sheath including a funnel segment slidably disposed over the inner shaft assembly, the funnel segment being longitudinally spaced from the prosthetic heart valve in the delivery state;
delivering the prosthetic heart valve in the compressed arrangement through a bodily lumen of the patient and to the implantation site via the delivery device in the delivery state;
proximally retracting the capsule segment relative to the prosthetic heart valve such that a distal region of the prosthetic heart valve is exposed distal the capsule, wherein the distal region self-expands toward a deployed arrangement;
evaluating a position of the prosthetic heart valve relative to the implantation site;
distally advancing the recapture sheath relative to the prosthetic heart valve such that the funnel segment is distal the capsule and expands to a funnel shape in response to contact with the distal region of the prosthetic heart valve;
distally advancing the funnel segment over the distal region of the prosthetic heart valve;
arranging the capsule over the prosthetic heart valve to cause the distal region of the prosthetic heart valve to transition toward the collapsed arrangement within the capsule; and
fully proximally retracting the capsule and the funnel segment from the prosthetic heart valve such that the prosthetic heart valve self-deploys from the inner shaft assembly.
2. The method of claim 1 , wherein the delivery sheath capsule is provided as part of a delivery sheath assembly further including a delivery sheath shaft, and further wherein the recapture sheath is slidably disposed between the delivery sheath assembly and the inner shaft assembly.
3. The method of claim 2 , wherein distally advancing the recapture sheath includes sliding the recapture sheath relative to the delivery sheath assembly.
4. The method of claim 3 , wherein arranging the capsule over the prosthetic heart valve to recapture the prosthetic heart valve includes sliding the capsule over the funnel segment.
5. The method of claim 1 , wherein the recapture sheath shaft is formed as a distal extension from the capsule such that the capsule and the recapture sheath are slidably fixed to one another.
6. The method of claim 5 , wherein distally advancing the recapture sheath includes distally advancing the delivery sheath assembly.
7. The method of claim 6 , wherein arranging the capsule over the prosthetic heart valve to recapture the prosthetic heart valve includes sliding the funnel segment distally beyond the prosthetic heart valve.