Double-Walled Stent System

• US 20090248133A1
• Filed: 04/01/2008
• Published: 10/01/2009
• Est. Priority Date: 04/01/2008
• Status: Active Grant

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Rafiee, Nasser, House, Morgan, Bloom, Eliot
• Granted Patent: US 7,806,919 B2
• Time in Patent Office: Days
• US Class Current: 623/1.150
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/852 Two or more distinct overlapping stents
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/825 having longitudinal struts
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91591 Locking connectors, e.g. using male-female connections
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0071 spherical
• CPC Class Codes: A61F 2230/0076 ellipsoidal or ovoid
• CPC Class Codes: A61F 2250/0037 differing in height or in length
• CPC Class Codes: A61F 2250/0063 Nested prosthetic parts
• CPC Class Codes: A61F 2250/0082 specially designed for children, e.g. having means for adjusting to their growth

Abstract

A double walled stent system particularly suited for treating abnormalities of the right ventricular outflow tract is disclosed having an exterior stent component and an interior stent component. The exterior stent component is secured to the interior stent component in a non-fixed, sliding relationship. The exterior stent component includes a plurality of longitudinally-extending connectors such as straight or sinusoidal bands. The interior stent component has a generally tubular cylindrical body and is centered within the exterior stent component. The stent system has a contracted delivery configuration and a radially expanded configuration for contacting the vessel wall. When deployed, the longitudinally-extending connectors of the exterior stent component come in contact with the vessel wall and fix the stent system to the treatment site. The interior stent component also radially expands but remains centered inside the exterior component and makes little to no contact with the vessel wall.

Claims

1. A stent system for use within a body lumen, the system comprising:

an interior stent component having a proximal end, a distal end, and a generally tubular cylindrical body defining a central flow lumen therethrough;

an exterior stent component including a plurality of longitudinally-extending connectors radially positioned around the tubular body of the interior stent component; and

means for securing the exterior stent component to the interior stent component in a non-fixed, sliding relationship,

wherein the longitudinally-extending connectors of the exterior stent component are configured to bow radially outward against a vessel wall of the body lumen and the interior stent component is radially positioned within the longitudinally-extending connectors of the exterior stent component when the stent system is in a radially expanded configuration.

2. The stent system of claim 1, wherein means for securing include at least one hook disposed on the outer surface of the interior stent component, wherein the hook defines a receptacle for receiving a longitudinally-extending connector.

3. The stent system of claim 2, wherein the at least one hook includes a strand of material having a first end and a second end, the first and second ends being connected to the interior stent component to define the receptacle.

4. The stent system of claim 2, wherein a filament is woven around a circumference of the interior stent component to define a plurality of hooks.

5. The stent system of claim 1, wherein means for securing include a portion of each longitudinally-extending connector woven through openings in the interior stent component.

6. The stent system of claim 5, wherein the interior stent component includes a plurality of adjacent stent struts aligned so as to form the tubular cylindrical body of the interior stent component, and a proximal portion of each of the longitudinally-extending connectors is woven through the opening between the plurality of adjacent stent struts at the proximal end of the interior stent component and a distal portion of each of the longitudinally-extending connectors is woven through the opening between the plurality of adjacent stent struts at the distal end of the interior stent component.

7. The stent system of claim 1, wherein a proximal end of each longitudinally-extending connector extends proximal to a proximal end of the interior stent component and a distal end of each longitudinally-extending connector extends distal to a distal end of the interior stent component.

8. The stent system of claim 7, wherein the interior stent component is longitudinally centered between the proximal and distal ends of the longitudinally-extending connectors.

9. The stent system of claim 1, wherein each longitudinally-extending connector is a band having a first end and a second end, wherein the first and second ends of the band are slightly curved in a radially outward direction.

10. The stent system of claim 1, wherein the longitudinally-extending connectors are self-expanding.

11. The stent system of claim 1, wherein in the radially expanded configuration the longitudinally-extending connectors of the exterior stent component undergo greater radial expansion than the interior stent component such that the interior stent component makes little to no contact with a wall of the body lumen.

12. The stent system of claim 1, wherein the longitudinally-extending connectors extend generally parallel to a longitudinal axis of the exterior stent component.

13. The stent system of claim 1, further comprising:

a valve located within the central flow lumen of the interior stent component, wherein nonporous graft material covers at least a portion of the interior stent component.

14. A stent system for use within a body lumen, the system comprising:

an interior stent component having a proximal end, a distal end, and a generally tubular cylindrical body defining a central flow lumen therethrough, the interior stent component including a plurality of hooks disposed around a circumference of the proximal end and the distal end of the interior stent component, wherein each hook defines a receptacle; and

an exterior stent component including a plurality of longitudinally-extending connectors radially positioned around the tubular body of the interior stent component, wherein each of the longitudinally-extending connectors is disposed through one of receptacles at the proximal end and one of the receptacles at the distal end of the interior stent component such that the exterior stent component is secured to the interior stent component in a non-fixed, sliding relationship,

wherein the longitudinally-extending connectors of the exterior stent component are configured to bow radially outward against a vessel wall of the body lumen and the interior stent component is radially positioned within the longitudinally-extending connectors of the exterior stent component when the stent system is in a radially expanded configuration.

15. The stent system of claim 14, wherein each hook includes a strand of material having a first end and a second end, the first and second ends being connected to the interior stent component to define the receptacle.

16. The stent system of claim 14, wherein a filament is woven around the circumference of the interior stent component to define the plurality of hooks.

17. The stent system of claim 14, wherein each longitudinally-extending connector is a band having a first end and a second end, wherein the first and second ends of the band are slightly curved in a radially outward direction.

18. The stent system of claim 14, wherein the longitudinally-extending connectors are self-expanding.

19. The stent system of claim 14, wherein in the radially expanded configuration the longitudinally-extending connectors of the exterior stent component undergo greater radial expansion than the interior stent component such that the interior stent component makes little to no contact with a wall of the body lumen.

20. A stent system for use within a body lumen, the system comprising:

an interior stent component having a proximal end, a distal end, and a generally tubular cylindrical body defining a central flow lumen therethrough, wherein the interior stent component includes a plurality of adjacent stent struts aligned so as to form the tubular cylindrical body of the interior stent component; and

an exterior stent component including a plurality of longitudinally-extending connectors radially positioned around the tubular body of the interior stent component, wherein a proximal portion of each of the longitudinally-extending connectors is woven through an opening between the plurality of adjacent stent struts at the proximal end of the interior stent component and a distal portion of each of the longitudinally-extending connectors is woven through an opening between the plurality of adjacent stent struts at the distal end of the interior stent component such that the exterior stent component is secured to the interior stent component in a non-fixed, sliding relationship,

wherein the longitudinally-extending connectors of the exterior stent component are configured to bow radially outward against a vessel wall of the body lumen and the interior stent component is radially positioned within the longitudinally-extending connectors of the exterior stent component when the stent system is in a radially expanded configuration.