Transcatheter deployment systems and associated methods
Various examples relate to a transcatheter delivery system including a sheath, a delivery catheter, and an implantable device (e.g., a prosthetic valve, a stent, a stent graft, occluder, or vascular filter) maintained in a collapsed configuration by the delivery catheter. The delivery catheter includes a plurality of fiber guides separated by one or more reduced profile sections each having a smaller transverse outer profile than the transverse outer profiles of the fiber guides.
1. A transcatheter delivery system including an actuation portion for a delivery catheter, the actuation portion being configured to tension and de-tension one or more device constraints, the actuation portion comprising:
a body portion;
a constraint guide coupled to the body portion;
at least one constraint maintained by the constraint guide;
a stake member, the at least one constraint releasably secured to the stake member;
a housing assembly coupled to the body portion;
a rack assembly received in the housing assembly and including a slide rail secured to the stake member and slidably receiving a slider secured to the at least one constraint;
a drive assembly slidably received over the slide rail and engageable with the slider to longitudinally translate the slider within the slide rail;
an actuation assembly including a rotatable deployment knob and configured to longitudinally translate the drive assembly along the slide rail; and
a release assembly configured to longitudinally translate the slide rail to longitudinally translate the stake member.
2. The transcatheter delivery system of claim 1 , wherein the at least one constraint includes a catch releasably secured to the stake member.
3. A transcatheter delivery system including a delivery catheter, the delivery catheter comprising:
a body portion,
a support portion extending from the body portion, the support portion configured to support an implantable device;
a stake member;
at least one constraint configured to be tensioned to the stake member to maintain the implantable device in a compacted delivery configuration, to be de-tensioned from the stake member to permit the implantable device to be transitioned to an expanded deployed configuration, and to be released from the stake member to release the implantable device from the delivery catheter; and
an actuation portion configured to tension the at least one constraint, to de-tension the at least one constraint, and to release the at least one constraint from the stake member, the actuation portion including,
a housing assembly coupled to the body portion,
a rack assembly received in the housing assembly and including a slide rail secured to the stake member and slidably receiving a slider secured to the at least one constraint,
a drive assembly slidably received over the slide rail and engageable with the slider to longitudinally translate the slider within the slide rail,
an actuation assembly including a rotatable deployment knob and configured to longitudinally translate the drive assembly along the slide rail, and
a release assembly configured to longitudinally translate the slide rail to longitudinally translate the stake member.
4. The transcatheter delivery system of claim 3 , wherein the at least one constraint includes a catch releasably secured to the stake member.
5. The transcatheter delivery system of claim 3 , wherein the drive assembly includes a clutch.
6. The transcatheter delivery system of claim 5 , wherein the clutch is a ratchet clutch.
7. The transcatheter delivery system of claim 3 , wherein the body portion, the rack assembly, and the drive assembly are releasably secured to the housing assembly by one or more clips, such that the rack assembly and the drive assembly are configured to be released from the drive assembly and the housing and slid longitudinally out from a distal end of the housing assembly.
8. The transcatheter delivery system of claim 3 , further comprising an implantable device maintained in a compacted delivery configuration on the support portion by the at least one constraint.
9. The transcatheter delivery system of claim 8 , wherein the implantable device is a prosthetic valve.
10. The transcatheter delivery system of claim 3 , wherein the delivery catheter includes at least two constraints, each constraint configured to be tensioned to the stake member to maintain the implantable device in the compacted delivery configuration, de-tensioned from the stake member to permit the implantable device to be transitioned to the expanded deployed configuration, and to be released from the stake member to release the implantable device from the delivery catheter.
11. The transcatheter delivery system of claim 3 , wherein the actuation assembly further includes a nut portion and a gear portion defining a clutch arrangement such that rotation of the gear portion results in rotation of the nut portion up until a torsional limit is reached at which point the gear portion is allowed to slip against the nut portion.
12. The transcatheter delivery system of claim 11 , wherein the nut portion is threaded onto the drive assembly.
13. The transcatheter delivery system of claim 12 , further comprising a shaft extending through the body portion and the support portion, the shaft including an enhanced flexibility portion proximal to the support portion, the enhanced flexibility portion including a distal section having a cut pattern characterized by a first pitch and a proximal section having a cut pattern characterized by a second pitch that is greater than the first pitch.
14. The transcatheter delivery system of claim 13 , wherein the distal section includes a distal transition portion having cut pattern characterized by a third pitch that is greater than the first pitch.
15. The transcatheter delivery system of claim 11 , wherein the gear portion includes a plurality of teeth engaged with a plurality of teeth of the deployment knob.
16. A transcatheter delivery system including an actuation assembly for a delivery catheter, the actuation assembly being configured to tension and de-tension one or more device constraints, the actuation assembly comprising:
a body portion;
a constraint guide coupled to the body portion;
at least one constraint maintained by the constraint guide;
a stake member, the at least one constraint releasably secured to the stake member;
a housing assembly coupled to the body portion;
a rack assembly received in the housing assembly and including a slide rail secured to the stake member and slidably receiving a slider secured to the at least one constraint;
a drive assembly slidably received over the slide rail and engageable with the slider to longitudinally translate the slider within the slide rail;
a nut portion threaded onto the drive assembly and a gear portion defining a clutch arrangement such that rotation of the gear portion results in rotation of the nut portion up until a torsional limit is reached at which point the gear portion is allowed to slip against the nut portion; and
an actuation assembly including a rotatable deployment knob and configured to longitudinally translate the drive assembly along the slide rail.
17. The transcatheter delivery system of claim 16 , wherein the clutch arrangement is a ratchet clutch arrangement.