Electric endovascular implant depolyment system

• US 6,607,539 B1
• Filed: 05/18/2001
• Issued: 08/19/2003
• Est. Priority Date: 05/18/2001
• Status: Active Grant

• Current Assignee: EndoVascular Technologies Incorporated (Boston Scientific Corporation)
• Original Assignee: EndoVascular Technologies Incorporated (Boston Scientific Corporation)
• Inventors: Chin, Albert K., Hayashi, Reid K.
• Primary Examiner(s): Lewis; Ralph A.
• Application Number:
  US09/860,717
• Time in Patent Office: 823 Days
• Field of Search: 606/108 623/1.11,1.12,1.13,1.23
• US Class Current: 606/108
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• 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 2250/0071 breakable or frangible

Abstract

A system for releasing a graft within vasculature that incorporates graft bindings severed by current-generated heat in a resistive wire element. In one aspect, the graft is held by bindings threaded through a resistive wire loop formed between conducting wires attached to opposite ends of a high resistive wire element. When an external current source is applied to the conducting wires, heat generated in the resistive wire element causes the bindings to sever, thereby allowing the graft to be released within vasculature.

Claims

1. A system for releasing a graft within a lumen, said system comprising:

a graft;

a delivery catheter adapted to be placed within the lumen;

an attachment device releasably attaching the graft to the delivery catheter; and

a release source for releasing the attachment device, the release source including one or more resistive wire elements and conducting wires;

wherein the release source is electrical and facilitates near contemporaneous release of the graft from the attachment device; and

the delivery catheter further comprising an inner catheter configured within the graft, the inner catheter including a conducting wire lumen to receive the conducting wires and at least one opening in communication with each end of each resistive wire element, whereby each conducting wire exits the conducting wire lumen at a different opening to engage one of each resistive wire element, thereby forming one or more resistive wire loops.

2. The system of claim 1, wherein the graft has a first configuration and a second configuration, the first configuration compressed from the second configuration, and the attachment device further comprises one or more bindings retaining the graft in the first configuration.

3. The system of claim 2, wherein the conducting wires connect each resistive wire element to a switchable external voltage, whereby voltage-generated heat in each resistive wire element severs at least one of the bindings retaining the graft in the first configuration.

4. The system of claim 3, wherein a coating is selectively applied to the resistive wire element to thereby protect the graft from heat generated by the resistance wire element.

5. The system of claim 3, the attachment device further comprising one or more bindings, each secured at its midpoint to the graft, threaded through one of the resistive wire loops, and affixed at its ends to the graft.

6. The system of claim 5, wherein each of the bindings is threaded through one of the resistive wire loops such that the binding resides entirely exterior to the graft.

7. The system of claim 5, wherein each of the bindings passes through a wall of the graft to engage one of the resistive wire loops.

8. The system of claim 5, each resistive wire element further coated with a heat resistant material, wherein gaps in the material allow the conducting wires to make contact with each resistive wire element and each resistive wire loop to make contact with one or more graft bindings.

9. The system of claim 5, wherein a heat resistant shield is placed between each resistive wire loop and the graft.

10. The system of claim 1, comprising:

the graft having a superior end and inferior end;

the inner catheter having a conducting wire lumen having two sets of two openings each, one inferior set and one superior set;

the attachment device including a superior binding and an inferior binding; and

the release source including a superior resistive wire element and an inferior resistive wire element;

wherein each conducting wire exits a different inferior opening in the conducting wire lumen, engages the inferior resistive wire element and reenters the same inferior opening, thereby forming an inferior resistive wire loop and each conducting wire further exits a different superior opening in the conducting wire lumen, engages the superior resistive wire element and reenters the same superior opening, thereby forming a superior resistive wire loop.

11. The system of claim 10, the conducting wires providing a common path between the switchable external voltage and the superior resisitive wire loop and inferior resistive wire loop, whereby the switchable external voltage is applied to the superior resistive wire loop and inferior resistive wire loop simultaneously.

12. The system of claim 10, the conducting wires providing separate paths between the switchable external voltage and the superior resistive wire loop and inferior resistive wire loop, whereby the switchable external voltage can be applied to the superior resistive wire loop and inferior resistive wire loop in a non-simultaneous manner.

13. The system of claim 10, the conducting wire lumen having more than two sets of openings, the attachment device including more than two bindings, and the release source having more than two resistive wire elements, thereby forming more than two resistive wire loops.

14. The system of claim 1, wherein the graft further comprises one or more attachment systems secured to the graft, each attachment system having a first configuration and a second configuration, the first configuration compressed from the second configuration.

15. The system of claim 1, further comprising a shield placed between the graft and the attachment device.

16. A method for releasing a graft within a lumen using a delivery catheter being releasably attached to the graft by an attachment device in combination with an electrical release source, the release source including one or more resistive wire elements and conducting wires and the delivery catheter including an inner catheter with a conducting wire lumen to receive the conducting wires and at least one opening in communication with each end of each resistive wire element, comprising:

configuring each conducting wire to exit the conducting wire lumen at a different opening to engage one end of each resistive wire element thereby forming one or more resistive wire loops;

placing the graft and delivery catheter within vasculature of a patient; and

activating the release source to automatically disengage the attachment device from the graft.

17. The method of claim 16, wherein the release source includes one or more resistive wire elements and conducting wires in communication with a voltage source and the activating step further comprises causing electricity to be passed from the voltage source to the resistive wire elements.

18. The method of claim 17, further comprising generating heat in the resistive wire element.

19. The method of claim 18, wherein the attachment device is placed in content with the at least one resistive wire element and further comprising allowing the heat generated by the resistive wire element to sever the attachment device.