DISTAL DETACHMENT MECHANISMS FOR VASCULAR DEVICES

• US 20130079864A1
• Filed: 09/27/2011
• Published: 03/28/2013
• Est. Priority Date: 09/27/2011
• Status: Active Grant

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: Codman & Shurtleff Incorporated (Johnson & Johnson)
• Inventors: Boden, Thomas, Brown, Michael C.
• Granted Patent: US 8,734,500 B2
• Time in Patent Office: Days
• US Class Current: 623/1.12
• 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 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section

Abstract

A system for delivering an expandable implant into the vasculature of a patient, including an elongated core element having a proximal end accessible exterior to the patient and a distal end including at least one feature for engaging a proximal portion of the implant in a collapsed state. The system further includes an expansion limiter having an inner diameter and a length sufficient to cover the proximal portion of the implant and to retain the proximal portion in the collapsed state, and at least one elongated member having a distal end connected to the expansion limiter and a proximal end accessible exterior to the patient to enable proximal movement of the expansion limiter to release the implant.

Claims

1. A system for delivering an expandable implant into the vasculature of a patient, comprising:

an elongated core element having a proximal end accessible exterior to the patient and a distal end including at least one feature for engaging a proximal portion of the implant in a collapsed state;

an expansion limiter having an inner diameter and a length sufficient to cover the proximal portion of the implant and to retain the proximal portion in the collapsed state; and

at least one elongated member having a distal end connected to the expansion limiter and a proximal end accessible exterior to the patient to enable proximal movement of the expansion limiter to release the implant.

2. The system of claim 1 further including a delivery catheter having an inner diameter sufficiently large to accommodate the core element, the implant in the collapsed state, and the expansion limiter.

3. The system of claim 1 wherein the feature is a projection from the core element.

4. The system of claim 1 wherein the feature is retractable relative to the core element to assist release of the implant.

5. The system of claim 1 wherein the expansion limiter is substantially cylindrical.

6. The system of claim 1 wherein the expansion limiter has overlapping side edges.

7. The system of claim 1 wherein the core element is formed of metal.

8. The system of claim 1 wherein the core element includes a solid wire in proximity to the feature.

9. The system of claim 1 wherein the member is a filament.

10. The system of claim 9 wherein the filament is a wire.

11. The system of claim 1 wherein the core element and the member are formed from a hypotube.

12. The system of claim 11 wherein the feature is retractable into the hypotube to assist release of the implant.

13. A system for delivering an expandable implant into the vasculature of a patient, comprising:

an expandable implant formed of self-expanding material and having a plurality of enlargements on at least its proximal portion;

an elongated core element having a proximal end accessible exterior to the patient and a distal end including a recess for receiving the enlargements and at least one feature for engaging the proximal portion of the implant in a collapsed state;

an expansion limiter having an inner diameter and a length sufficient to cover the proximal portion of the implant and to retain the proximal portion in the collapsed state; and

at least one member having a distal end connected to the expansion limiter and a proximal end accessible exterior to the patient to enable the expansion limiter to be pulled proximally to release the implant.

14. The system of claim 13 further including a delivery catheter having an inner diameter sufficiently large to accommodate the core element, the implant in the collapsed state, and the expansion limiter.

15. The system of claim 13 wherein the enlargements on the implant include radiopaque markers.

16. The system of claim 13 wherein the expansion limiter is less than half as long as the implant.

17. A system for delivering an expandable implant into the vasculature of a patient, comprising:

an expandable implant formed of self-expanding material and having a plurality of radiopaque markers on at least its proximal portion;

an elongated core element having a proximal end accessible exterior to the patient and a distal end including a solid core wire defining a recess for receiving the radiopaque markers and at least one feature for engaging the proximal portion of the implant in a collapsed state;

an expansion limiter having an inner diameter and a length sufficient to cover the proximal portion of the implant and to retain the proximal portion in the collapsed state; and

at least one filament having a distal end connected to the expansion limiter and a proximal end accessible exterior to the patient to enable the expansion limiter to be pulled proximally to release the implant.

18. The system of claim 17 further including a delivery catheter having an inner diameter sufficiently large to accommodate the core wire, the implant in the collapsed state, and the expansion limiter.

19. The system of claim 18 wherein the expansion limiter is less than half as long as the implant.

20. The system of claim 19 wherein the feature is a projection from the core element.