IVC filter retrieval systems with multiple capture modes
Funnel-trap type delivery and/or retrieval devices for temporary Inferior Vena Cava (IVC) filters or other medical implants or foreign bodies are described. These may employ a locking sheath or a proximal-aperture capture feature or features for IVC filter (or other device) retrieval.
1. An apparatus for delivery or retrieval of a vascular medical device, the apparatus comprising:
an elongate shaft having an axis and a flexible distal extension, the flexible distal extension comprising a braid folded back at a first fold to form two layers;
upon deployment, the two layers of the flexible distal extension are folded-hack inwardly at a second fold to form a funnel having a distal opening and a proximal opening, the proximal opening being formed by the first fold, the proximal opening configured to receive therethrough a portion of the medical device for securing the medical device;
a tether disposed between the two layers of the braid and around a portion of the proximal opening; and
an elongate sleeve having a lumen, wherein the elongate shaft and the flexible distal extension are within the lumen of the elongate sleeve.
2. The apparatus of claim 1 , wherein the distal extension is selectable in angular orientation.
3. The apparatus of claim 1 , wherein the two layers of braid are bonded to the shaft.
4. The apparatus of claim 1 , further comprising the medical device.
5. The apparatus of claim 4 , wherein the medical device is an inferior vena cava filter.
6. The apparatus of claim 1 , wherein the elongate sleeve is sized to secure the portion of the medical device in a pocket within the distal extension.
7. The apparatus of claim 1 , wherein the tether is configured to at least partially close the proximal opening upon actuation.
8. The apparatus of claim 7 , wherein the tether is connected to the elongate shaft proximal to the proximal opening.
9. The apparatus of claim 8 , wherein the tether is connected at a proximal end region of the elongate shaft.
10. The apparatus of claim 9 , further comprising a user interface at a proximal end region of the shaft and connected to the tether to actuate the tether for closing or releasing the proximal opening, the user interface selected from a handle and a plug received by the elongate shaft.
11. The apparatus of claim 1 , wherein the funnel has a cone angle between 30 to 90 degrees when deployed.
12. The apparatus of claim 1 , wherein the tether is configured as a lasso.
13. The apparatus of claim 1 , wherein the distal opening is larger than the proximal opening.
14. The apparatus of claim 1 , wherein the tether and the flexible distal extension exit out of the elongate shaft at a same opening, and wherein the flexible distal extension encloses a portion of the tether that extends out of the elongate shaft.
15. The apparatus of claim 1 , wherein the tether forms a cross-hair type structure in the proximal opening.
16. An apparatus for delivery or retrieval of a vascular medical device, the apparatus comprising:
an elongate sleeve having a lumen;
an elongate shaft slidably positioned within the lumen of the elongate sleeve;
a flexible extension attached to the elongate shaft, the flexible extension comprising a braid folded back at a first fold to form two layers of the braid, and upon deployment, the two layers of the flexible extension form a braided funnel having an inwardly-folded-hack portion with a distal opening at a second fold and a proximal opening at the first fold, the proximal opening being displaced from an end of the elongate sleeve and sized to receive a portion of the medical device therethrough for securing the medical device; and
a tether disposed between the two layers of the braid and around a portion of the proximal opening.
17. The apparatus of claim 16 , wherein the funnel comprises a heatset material that is biasable in an angular direction.
18. The apparatus of claim 16 , wherein the tether encircles the proximal opening.
19. The apparatus of claim 16 , further comprising:
a user interface at the proximal end of the elongate shaft and
wherein the tether is connected to the proximal opening and to the user interface, wherein the user interface is configured to actuate the tether for closing or opening the proximal opening, wherein the user interface is selected from a group consisting of a handle, a plug, a wheel, and a thumb slide.
20. The apparatus of claim 16 , wherein the tether and the flexible extension exit out of the elongate shaft at a same opening, and wherein the flexible extension encloses a portion of the tether that extends out of the elongate shaft.
21. The apparatus of claim 16 , wherein the tether comprises a strand that forms a loop at the proximal opening and an eyelet.
22. The apparatus of claim 16 , wherein the tether forms a cross-hair type structure in the proximal opening.