Releasable delivery system

• US 10,182,931 B2
• Filed: 09/19/2016
• Issued: 01/22/2019
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: Microvention Incorporated (Terumo Corporation)
• Original Assignee: Microvention Incorporated (Terumo Corporation)
• Inventors: Pung, Ponaka, Tieu, Tai D., Soltanian, Ross, Nguyen, Helen, Nguyen, Oanh, Ngo, Britney
• Primary Examiner(s): Stransky, Katrina
• Application Number:
  US15/269,782
• Publication Number:
  US 20170079819A1
• Time in Patent Office: 855 Days
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

Implant engagement mechanisms are disclosed for maintaining engagement with a stent until it has been fully deployed and expanded from a catheter or sheath. The apparatus, method and system involving these engagement mechanisms allow a physician to withdraw or retract a sheath prior to full deployment, thereby allowing for redeployment of the stent at a more desirable position.

Claims

1. A vessel prosthesis delivery device comprising:

a sheath;

an elongated pusher disposed within the sheath;

a plurality of wires extending distally from the pusher;

a plurality of pusher protrusions supported in a position radially away from the pusher by the plurality of wires; and

,

a prosthesis having a plurality of prosthesis protrusions and being disposed radially over said plurality of wires;

wherein the plurality of pusher protrusions are positioned distally of the plurality of prosthesis protrusions within the sheath, such that proximal retraction of the pusher contacts proximal ends of the plurality of the pusher protrusions against distal ends of the plurality of prosthesis protrusions.

2. The vessel prosthesis delivery device of claim 1 wherein the plurality of wires are bowed away from the pusher.

3. The vessel prosthesis delivery device of claim 1 wherein the plurality of wires are arc-shaped.

4. The vessel prosthesis delivery device of claim 1 further comprising a radiopaque marker band at a distal end of the pusher.

5. The vessel prosthesis delivery device of claim 1 wherein the plurality of wires extending distally from the pusher comprise 2 to 8 wires.

6. The vessel prosthesis delivery device of claim 1 further comprising a core wire spanning through the pusher and extending distally of the pusher.

7. The vessel prosthesis delivery device of claim 6 wherein the plurality of wires are proximally connected to the pusher and distally connected to a distal bonding location on the core wire.

8. The vessel prosthesis delivery device of claim 1 wherein the outward pusher protrusions are pusher marker bands.

9. The vessel prosthesis delivery device of claim 8 wherein the plurality of prosthesis protrusions are marker coils that inwardly protrude from proximal loops of the prosthesis.

10. A vessel prosthesis delivery system comprising:

a sheath;

an elongated pusher movable within the sheath;

a prosthesis pushed by the pusher, the prosthesis having radially inward prosthesis protrusions;

a plurality of wires extending distally from the pusher, the plurality of wires having radially outward pusher protrusions;

wherein the outward pusher protrusions of the plurality of wires are positioned distal to the inward prosthesis protrusions of the prosthesis within the sheath, such that proximal retraction of the pusher contacts proximal ends of the plurality of pusher protrusions against distal ends of the plurality of prosthesis protrusions.

11. The vessel prosthesis delivery system of claim 10 wherein the outward pusher protrusions are marker bands and the inward prosthesis protrusions are marker coils.

12. The vessel prosthesis delivery system of claim 11 wherein the plurality of wires support the marker bands in a position radially away from a diametric center of the pusher.

13. The vessel prosthesis delivery system of claim 11 wherein the plurality of wires are bowed away from the pusher.

14. The vessel prosthesis delivery system of claim 11 wherein the plurality of wires are arc-shaped.

15. The vessel prosthesis delivery system of claim 11 wherein the marker coils are located on proximal loops of the prosthesis.

16. A vessel prosthesis delivery system comprising:

a delivery sheath;

an elongated pusher disposed within the delivery sheath and having an exposed region of core wire extending from a distal end of the elongated pusher;

a prosthesis having a plurality of marker coils;

a plurality of wires extending distally along the pusher, radially within the prosthesis, and over the exposed region of the core wire, the plurality of wires each having a marker band, the plurality of wires supporting the marker bands in a position radially away from the exposed region of the core wire;

wherein each of the marker bands of the plurality of wires are positioned distally of the marker coils within the delivery sheath such that proximal retraction of the pusher contacts proximal ends of each of the marker bands against distal ends of each of the marker coils.