Implant Retention, Detachment, And Delivery System

• US 20170079817A1
• Filed: 09/16/2016
• Published: 03/23/2017
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: Microvention Incorporated (Terumo Corporation)
• Original Assignee: Microvention Incorporated (Terumo Corporation)
• Inventors: Sepetka, Ivan, Lei, Cathy
• Granted Patent: US 10,617,544 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/844 folded prior to deployment
• 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 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• 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 2002/068 Modifying the blood flow model, e.g. by diffuser or deflector
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2230/0067 conical

Abstract

A medical implant delivery system is described. The system can be used to deliver a variety of implants including stents and/or stent grafts. The delivery system retains the implant during delivery and detaches the implant at a target location.

Claims

1. A delivery system for an implant, comprising:

an elongated pusher having a distal pusher end and a proximal pusher end;

a retention structure having a proximal structure end fixed to said pusher near said distal pusher end, and a distal structural end extending distally away from said distal pusher end;

said retention structure having a radially compressed configuration and a radially expanded configuration; and

,

and implant located near said distal pusher end and in contact with said retention structure;

wherein said retention structure engages said implant in said radially compressed configuration and releases said implant in said radially expanded configuration.

2. The delivery system of claim 1, wherein said retention structure is composed of mesh formed from one or more braided wires.

3. The delivery system of claim 2, wherein said retention structure has a tubular shape in said radially compressed configuration and a conical shape opening distally relative to said elongated pusher when in said radially expanded configuration.

4. The delivery system of claim 3, further comprising a plurality of engagement elements fixed on said retention structure and protruding radially inwards of said retention structure.

5. The delivery system of claim 4, wherein said implant is a stent having a plurality of loops extending from its proximal end.

6. The delivery system of claim 5, wherein said retention structure overlaps a proximal portion of said stent.

7. The delivery system of claim 6, further comprising a tether connected to said stent and connected to said elongated pusher, said elongated pusher being configured to selectively break said tether.

8. The delivery system of claim 1, wherein said retention structure is composed of a plurality of loops.

9. The delivery system of claim 8, wherein said plurality of loops radially overlap said implant.

10. The delivery system of claim 8, wherein said implant is a stent and said plurality of loops extend through portions of said stent.

11. The delivery system of claim 8, further comprising a tether connected to said elongated pusher and said implant.

12. A delivery system for an implant, comprising:

a catheter having a passage therethrough between a distal catheter end and a proximal catheter end;

an elongated pusher having a distal pusher end and a proximal pusher end;

said elongated pusher being disposed in said passage of said catheter so as to move longitudinally relative to said catheter;

a retention structure having a proximal structure end fixed to said pusher near said distal pusher end, and a distal structural end extending distally away from said distal pusher end;

said retention structure having a radially compressed configuration and a radially expanded configuration; and

,

and implant located near said distal pusher end and in contact with said retention structure;

wherein said retention structure engages said implant in said radially compressed configuration within said passage of said catheter and releases said implant in said radially expanded configuration when advanced distally outside of said distal catheter end.

13. The delivery system of claim 12, wherein said retention structure is composed of mesh formed from one or more braided wires;

and wherein said retention structure has a tubular shape in said radially compressed configuration and a conical shape opening distally relative to said elongated pusher when in said radially expanded configuration.

14. The delivery system of claim 12, wherein said retention structure is composed of a plurality of loops;

and wherein said plurality of loops radially overlap said implant.

15. The delivery system of claim 12, wherein said retention structure further comprises:

a mesh formed from one or more braided wires; and

,

a plurality of engagement structures connected to and protruding from said mesh;

wherein said plurality of engagement structures engage one or more loops on said implant.

16. A method of delivering a stent, comprising:

distally advancing an elongated pusher within a passage of a catheter;

said elongated pusher having an implant retention structure on its distal end that is engaged with and disposed over a stent; and

,

distally advancing said stent completely out of said catheter while maintaining engagement of said implant retention structure with said stent.

17. The method of claim 16, further comprising proximally withdrawing said elongated pusher so that said stent is proximally withdrawn into said catheter.

18. The method of claim 16, wherein said implant retention structure is a conical mesh disposed around a proximal portion of said stent.

19. The method of claim 18, further comprising breaking a tether connected to said elongated pusher and said stent.