Delivery mechanism for implantable stent

• US 8,852,266 B2
• Filed: 10/16/2006
• Issued: 10/07/2014
• Est. Priority Date: 09/30/1998
• Status: Active Grant

• Current Assignee: Bard Peripheral Vascular Incorporated (Becton, Dickinson & Co)
• Original Assignee: Bard Peripheral Vascular Incorporated (Becton, Dickinson & Co)
• Inventors: Brooks, Christopher J., Mccrea, Brendan, Randall, Scott L., Van-Royen, Donald
• Primary Examiner(s): Rodriguez, Cris L
• Assistant Examiner(s): Mai, Hao D
• Application Number:
  US11/581,645
• Publication Number:
  US 20070032860A1
• Time in Patent Office: 2,913 Days
• Field of Search: 623/1.11, 623/1.12, 623/1.23, 623/1, 623/1.14, 623/1.36, 623 11- 12, 606/108, 604/528
• US Class Current: 623/1.23
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod

Abstract

A delivery system including an inner catheter with a reinforcing element and an outer catheter having a proximal end attached to a movable member. An abutment element may be attached to a distal end of the reinforcing element, configured to engage an implantable device disposed between the inner catheter and the outer catheter.

Claims

1. A delivery system comprising:

an elongated housing comprising;

a passageway;

a stationary ratchet on a first side;

a movable ratchet on a second side directly opposite the first side; and

a pinion engaging the movable ratchet;

a movable member disposed within the passageway;

an actuating means coupled to the housing for incrementally moving the movable member in a first direction;

an outer sheath including a proximal end attached to the movable member;

an inner tube extending through the outer sheath;

a tip attached to the inner tube;

a compressed reinforcing element surrounding the inner tube for maintaining a position of a stent during retraction of the outer sheath;

a length between a distal end of the reinforcing element and the tip accommodating the stent;

an abutment element attached to the distal end of the reinforcing element, the abutment element including an open end configured to engage a proximal end of a stent; and

the outer sheath covering the length in a delivery configuration, the movable member configured to retract the outer sheath to uncover the length in a deployed configuration.

2. The delivery system according to claim 1, wherein the tip includes a rounded distal end.

3. The delivery system according to claim 1, wherein a mid-region of the tip has a width that is approximately equal to an inside diameter of the outer sheath.

4. The delivery system according to claim 1, wherein the tip includes a radiopaque material.

5. The delivery system according to claim 1, wherein the tip is formed around a distal end of the inner tube.

6. The delivery system according to claim 1, wherein the abutment element includes a plastic material.

7. The delivery system according to claim 6, wherein the abutment element is molded to the reinforcing element.

8. The delivery system according to claim 1, wherein the abutment element includes a metal material.

9. The delivery system according to claim 8, wherein the abutment element is welded to the reinforcing element.

10. The delivery system according to claim 1, wherein the proximal end of the outer sheath in fluid communication with a flush port.

11. The delivery system according to claim 1, wherein the inner tube includes a guide wire lumen.

12. The delivery system according to claim 1, wherein the outer sheath in a first position has a distal end disposed about an implantable device and wherein movement of the movable member retracts the distal end to a second position proximal of the stent.

13. The delivery system according to claim 1, wherein the movable member is selected from the group consisting of a pawl/sheath hub, a piston, a rack, and a power screw.

14. A method of delivering an implantable device comprising:

providing a delivery system comprising;

an elongated housing comprising;

a passageway;

a stationary ratchet on a first side;

a movable ratchet on a second side directly opposite the first side; and

a pinion engaging the movable ratchet;

a movable member disposed within the passageway;

an actuating means coupled to the housing for incrementally moving the movable member in a first direction;

an outer sheath including a proximal end attached coupled to the movable member and a distal end disposed about a stent;

an inner tube extending through the outer sheath;

a tip attached to the inner tube distal of the outer sheath;

a compressed reinforcing element surrounding the inner tube for maintaining a position of a stent during retraction of the outer sheath;

a length between a distal end of the reinforcing element and the tip accommodating the stent;

an abutment element attached to a distal end of the reinforcing element, the abutment element including an open end; and

a stent having a proximal end positioned in the open end of the abutment element;

inserting a distal end of the delivery system into a body vessel and positioning the delivery system at a desired location; and

moving the movable member to retract the distal end of the outer sheath to a position proximal of the stent.

15. The method according to claim 14, the moving step including maintaining the inner tube in a fixed position.

16. The method according to claim 14, further comprising the step of retracting a distal end of the inner tube through a lumen of the stent to a position adjacent the distal end of the outer sheath.

17. The method according to claim 14, wherein the inner tube has a distal end attached to a radiopaque tip, the inserting step including monitoring the tip to position the tip in the desired location.

18. The method according to claim 14, wherein the moving step includes incrementally retracting the distal end of the outer sheath.

19. The method according to claim 14, wherein the movable member is attached to a mechanism that provides a mechanical advantage of approximately 4:

1, the moving step including retraction of the outer sheath in a smooth and linear fashion.