VASCULAR IMPLANT

• US 20120022637A1
• Filed: 09/30/2011
• Published: 01/26/2012
• Est. Priority Date: 11/19/2003
• Status: Active Grant

• Current Assignee: Shockwave Medical, Incorporated
• Original Assignee: Neovasc Medical Ltd. (Neovasc Incorporated)
• Inventors: Ben-Muvhar, Shmuel
• Granted Patent: US 8,911,489 B2
• Time in Patent Office: Days
• US Class Current: 623/1.16
• CPC Class Codes: A61B 17/1227 Spring clips
• CPC Class Codes: A61B 17/1285 for minimally invasive surgery
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• 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 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/962 having an outer sleeve
• 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 2002/068 Modifying the blood flow model, e.g. by diffuser or deflector
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/826 more than one stent being applied sequentially
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0071 breakable or frangible

Abstract

A medical implant (20) includes first and second ring members (22, 24), each including a resilient framework (26) having a generally cylindrical form. A tubular sleeve (28) is fixed to the first and second ring members so as to hold the ring members in mutual longitudinal alignment, thereby defining a lumen (32) passing through the ring members. A constricting element (30) is fit around the sleeve at a location intermediate the first and second ring members so as to reduce a diameter of the lumen at the location.

Claims

1. A medical implant, comprising:

first and second ring members, each comprising a resilient framework having a generally cylindrical form;

a tubular sleeve, fixed to the first and second ring members so as to hold the ring members in mutual longitudinal alignment, thereby defining a lumen passing through the ring members; and

a constricting element, which is fit around the sleeve at a location intermediate the first and second ring members so as to reduce a diameter of the lumen at the location.

2. The implant according to claim 1, wherein the framework comprises a wire, which is bent in a serpentine form.

5. The implant according to claim 1, and comprising one or more longitudinal support members, fixed to the framework of the first and second ring members, alongside the sleeve, so as to join the first and second ring members together.

6. The implant according to claim 1, wherein the sleeve comprises a fabric.

7. The implant according to claim 6, wherein the fabric is stitched to the framework of the first and second ring members.

8. The implant according to claim 1, wherein the lumen passing through the first and second ring members has first and second ends, and wherein the framework is configured to provide elongate protrusions at one or more of the ends of the lumen.

9. The implant according to claim 8, wherein the sleeve is cut at one or more of the first and second ends in conformance with the protrusions.

10. The implant according to claim 9, wherein the sleeve is cut at the first end in conformance with the protrusions, while the sleeve at the second end covers both the protrusions and interstices between the protrusions at the second end of the lumen.

11. The implant according to claim 1, wherein the implant is adapted to be implanted in a coronary sinus of a patient, so that a flow of blood through the coronary sinus is inhibited by the reduced diameter of the lumen.

12. The implant according to claim 1, wherein the constricting element is adapted to expand under an outward radial force so as to permit the reduced diameter of the lumen to increase.

13. The implant according to claim 12, wherein the constricting element comprises an elastic wire, having bends that are fastened shut so as to provide the reduced diameter, and which are adapted to open under the outward radial force.

3. The implant according to claim L wherein the ring members are adapted to be inserted in a radially-compressed form through a body passage to a target position within the passage, and then to expand radially at the target position so as to open the lumen therethrough.

4. The implant according to claim 3, wherein the framework comprises an elastic material, which is compressible to provide the radially-compressed form of the ring members, and which expands radially when released at the target position.

14. A stent for implantation in a lumen, comprising:

a plurality of struts, with intervening openings therebetween; and

narrow connecting pieces, bridging at least some of the openings so as to interconnect the struts,

wherein exertion of a first outward radial force on the struts causes the stent to open to a first diameter by opening the intervening openings between the struts, and

wherein the narrow connecting pieces are adapted to break under exertion on the struts of a second outward radial force, greater than the first outward radial force, so that the stent opens to a second diameter, greater than the first diameter.