EXPANSION RING FOR A BRAIDED STENT

• US 20180110636A1
• Filed: 10/21/2016
• Published: 04/26/2018
• Est. Priority Date: 10/21/2016
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: LORENZO, Juan, SLAZAS, Robert, TEHRANI, Ramin, PEDROSO, Pedro
• Granted Patent: US 10,182,927 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/844 folded prior to deployment
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/852 Two or more distinct overlapping stents
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/93 circumferentially expandable by using ratcheting locks
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2220/0091 connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2250/001 for adjusting a diameter

Abstract

A braided stent system includes a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween and a first expansion ring connected to the lumen of the stent body. The first expansion ring may include a frame defined by a plurality of interconnected support assemblies that are selectively positioned to impart an outwardly expanding radial force to the stent body, each support assembly can include a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection. Each support assembly can include a claw portion mechanically connected to one or more of the interstices of the stent body so that the frame imparts an outward radial expansion force of the stent to facilitate use and delivery of the stent.

Claims

1. A braided stent system, the system comprising:

a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween; and

an expansion ring mechanically connected to the lumen of the stent body, the expansion ring comprising a frame that imparts an outwardly expanding radial force to the stent body, the frame comprising a plurality of legs joined at a first intersection and a claw portion mechanically connected to one or more of the interstices of the stent body.

2. The system of claim 1, wherein the claw portion mechanically connects the expansion ring to one or more of the interstices by extending away from the first intersection through a plurality of the interstices and terminating at a locking mechanism opposite the first intersection.

3. The system of claim 2, the claw portion comprising at least two aligned elongate members extended between the first intersection and the locking mechanism to form a void through which the plurality of interstices pass.

4. The system of claim 1, wherein the plurality of legs of the frame are bowed causing the frame to be resistant to compression, the legs being twistable a predetermined amount about the first intersection.

5. A braided stent system, the system comprising:

a stent body having a lumen formed by a plurality of braided members with interstices formed therebetween; and

a first expansion ring connected to the lumen of the stent body, the first expansion ring comprising a frame defined by a plurality of interconnected support assemblies selectively positioned to impart an outwardly expanding radial force to the stent body, each support assembly comprising;

a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection; and

a claw portion mechanically connected to one or more of the interstices of the stent body.

6. The system of claim 5, wherein the plurality of legs of the frame are bowed causing the frame to be resistant to compression, the legs being twistable about the first and second intersections.

7. The system of claim 5, wherein the claw portion mechanically connects the expansion ring to inner and outer portions of the lumen by extending away from the first intersection, being interlaced through at least two of the interstices, and being terminated at a locking mechanism opposite the intersections.

8. The system of claim 7, wherein the locking mechanism includes one of a T-shaped end or outwardly extending hooked members operable to fixedly connect to the interstices of the stent body.

9. The system of claim 7, wherein at least one of the claw portions comprises a plurality of aligned elongate members extended between respective first intersections and locking mechanisms to form a void through which the plurality of interstices pass.

10. The system of claim 9, wherein a plurality of braided pairs of the braided members pass through the void.

11. The system of claim 9, where the locking mechanism fixedly connects the expansion ring to the stent body by joining ends of the aligned elongate members opposite the first intersection through welding, soldering, crimping, or an adhesive bond.

12. The system of claim 9, where the locking mechanism fixedly connects the expansion ring to the stent body by joining ends of the aligned elongate members opposite the first intersection through a metallic band or ring.

13. The system of claim 5, wherein at least one of the second intersections forms at least one of a V-shape, a U-shape, or an elliptical curve.

14. The system of claim 5, wherein at least one of the first intersections forms V-shape, a U-shape, or an elliptical curve.

15. The system of claim 5, wherein the stent body includes a proximal end, a distal end, and a central portion disposed therebetween, and wherein the first expansion ring is disposed on or adjacent the distal or proximal ends of the stent body with the second intersections of the interconnected support assemblies being joined at or adjacent the respective distal or proximal ends.

16. The system of claim 15, further comprising:

a second expansion ring connected to the lumen along the central portion of the stent body, the second expansion ring comprising a frame defined by a plurality of interconnected support assemblies selectively positioned to impart a balanced outwardly expanding radial force to the stent body, each support assembly comprising;

a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection; and

a claw portion mechanically connected to one or more of the interstices of the stent body.

17. A method of deploying a braided stent body into a vessel, the method comprising:

assembling a plurality of expansion rings to a lumen of the braided stent body, the lumen of the braided stent body being formed by a plurality of braided members with interstices formed therebetween;

selectively positioning each expansion ring with the braided stent body;

each expansion ring imparting an outwardly expanding radial force thereby maintaining the lumen of the braided stent body in an opened position, each expansion ring comprising;

a frame defined by a plurality of interconnected support assemblies comprising a plurality of legs joined at a first intersection and connected to one of the other interconnected support assemblies at a second intersection opposite the first intersection, the legs being twistable about the first and second intersections; and

a claw portion disposed opposite the first and second intersections;

mechanically connecting the claw portion of each ring to an inner portion of the stent body by interlacing a first elongate member extended between the respective claw portion and the respective first intersection of the expansion ring with one or more of the interstices and terminated at a locking mechanism opposite the intersections; and

translating the braided members in the vessel independently from each expansion ring.

18. The system of claim 17, further comprising:

bowing the legs of each expansion ring causing each ring to be resistant to compression.

19. The system of claim 17, wherein at least one of the claw portions comprises a second alignment member substantially aligned with the first elongate member and extended between respective first intersections and locking mechanisms, the method further comprising:

forming a void between the first and second elongate members and respective first intersections and locking mechanisms; and

passing a plurality of braided pairs of the braided members through the void.

20. The system of claim 19, further comprising:

fixedly connecting the expansion ring to the stent body by joining ends of the first and second elongate members opposite the first intersection through welding, soldering, crimping, an adhesive bond, or a fastener.