STENT DELIVERY SYSTEM

• US 20130013047A1
• Filed: 09/22/2011
• Published: 01/10/2013
• Est. Priority Date: 11/17/2010
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: GRABOWSKI, GERALD, RAMOS, TIM, ANDERSON, KEITH
• Granted Patent: US 9,220,619 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• 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

Stent delivery systems and methods for making and using the same are disclosed. An example stent delivery system may include an inner member having a proximal end. A sleeve may be coupled to the inner member adjacent to the proximal end. A deployment sheath may be disposed about the inner member. A gear rack assembly may be coupled to the deployment sheath. A stent may be disposed between the inner member and the deployment sheath. A handle may be coupled to the inner member and to the deployment sheath. The handle may include an actuation member. The actuation member may be coupled to the gear rack assembly so that actuation of the actuation member shifts the longitudinal position of the gear rack assembly and the deployment sheath. An engagement mechanism may be coupled to the gear rack assembly.

Claims

1. A stent delivery system, comprising:

an inner member having a proximal end;

a sleeve coupled to the inner member adjacent to the proximal end;

a deployment sheath disposed about the inner member;

a gear rack assembly coupled to the deployment sheath;

a stent disposed between the inner member and the deployment sheath;

a handle coupled to the inner member and to the deployment sheath;

wherein the handle includes an actuation member, the actuation member being coupled to the gear rack assembly so that actuation of the actuation member shifts the longitudinal position of the gear rack assembly and the deployment sheath; and

an engagement mechanism coupled to the gear rack assembly, the engagement mechanism being configured to engage the sleeve of the inner member so that proximal retraction of the gear rack assembly results in proximal retraction of the inner shaft.

2. The stent delivery system of claim 1, wherein the engagement mechanism includes a loop extending from the gear rack assembly.

3. The stent delivery system of claim 2, wherein the engagement mechanism includes a rod extending from the loop to a position along the exterior of the handle.

4. The stent delivery system of claim 1, wherein the engagement mechanism includes a projection extending from the gear rack assembly.

5. The stent delivery system of claim 1, wherein the engagement mechanism includes a horseshoe shaped member extending from the gear rack assembly.

6. The stent delivery system of claim 1, wherein the engagement mechanism is arranged to catch on the sleeve after the deployment sheath is proximally retracted a distance.

7. The stent delivery system of claim 6, wherein the engagement mechanism is configured to proximally retract the inner member after the engagement mechanism is caught on the sleeve.

8. The stent delivery system of claim 1, wherein the inner member includes a distal tip.

9. The stent delivery system of claim 1, wherein the actuation member includes a thumbwheel.

10. The stent delivery system of claim 1, further comprising an outer member disposed over a portion of the deployment sheath.

11. The stent delivery system of claim 1, further comprising an intermediate tube disposed between the inner member and the deployment sheath, the intermediate tube including a bumper.

12. The stent delivery system of claim 1, wherein the gear rack assembly has a flared proximal end.

13. A stent delivery system, comprising:

an inner member having an enlarged proximal end and an atraumatic distal tip;

a stent disposed about the inner member;

a deployment sheath disposed about the inner member and the stent;

a gear rack assembly coupled to the deployment sheath;

a handle coupled to the inner member and to the deployment sheath;

wherein the handle includes a thumbwheel that is coupled to the gear rack assembly so that rotation of the thumbwheel proximally retracts the gear rack assembly and the deployment sheath; and

an engagement mechanism coupled to the gear rack assembly, the engagement mechanism being configured to catch on the enlarged proximal end of the inner member, after the deployment sheath is proximally retracted a distance, and proximally retract the inner member.

14. The stent delivery system of claim 13, wherein the engagement mechanism includes a loop extending from the gear rack assembly.

15. The stent delivery system of claim 14, wherein the engagement mechanism includes a rod extending from the loop to a position along the exterior of the handle.

16. The stent delivery system of claim 13, wherein the engagement mechanism includes a projection extending from the gear rack assembly.

17. The stent delivery system of claim 13, wherein the engagement mechanism includes a horseshoe shaped member extending from the gear rack assembly.

18. The stent delivery system of claim 13, further comprising an outer member disposed over a portion of the deployment sheath.

19. The stent delivery system of claim 13, further comprising an intermediate tube disposed between the inner member and the deployment sheath, the intermediate tube including a bumper.

20. A method for deploying a stent, the method comprising:

providing a stent delivery system comprising;

an inner member having an enlarged proximal end and an atraumatic distal tip,

a stent disposed about the inner member,

a deployment sheath disposed about the inner member and the stent,

a gear rack assembly coupled to the deployment sheath,

a handle coupled to the inner member and to the deployment sheath,

wherein the handle includes a thumbwheel that is coupled to the gear rack assembly so that rotation of the thumbwheel proximally retracts the gear rack assembly and the deployment sheath, and

an engagement mechanism coupled to the gear rack assembly, the engagement mechanism being configured to catch on the enlarged proximal end of the inner member, after the deployment sheath is proximally retracted a first distance, and proximally retract the inner member,

advancing the stent delivery system through a body lumen to a position adjacent to an area of interest;

rotating the thumbwheel to proximally retract the gear rack assembly the first distance;

wherein retraction of the gear rack assembly the first distance results in the engagement mechanism catching on the enlarged proximal end of the inner member; and

further rotating the thumbwheel to further proximally retract the gear rack assembly and to proximally retract the inner member.