Medical device

• US 10,390,934 B2
• Filed: 12/18/2017
• Issued: 08/27/2019
• Est. Priority Date: 03/31/2004
• Status: Active Grant

• Current Assignee: Merlin MD Pte. Ltd.
• Original Assignee: Merlin MD Pte. Ltd.
• Inventors: Rudakov, Leon, O'Connor, Michael, Gandhi, Deepak
• Primary Examiner(s): Stewart, Jason-Dennis N
• Application Number:
  US15/846,071
• Publication Number:
  US 20180168796A1
• Time in Patent Office: 617 Days
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• 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 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/077 having means to fill the space between stent-graft and aneurysm wall, e.g. a sleeve
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91566 connected trough to trough
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2002/91583 by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes

Abstract

A method for treating an aneurysm can include inserting a medical device partially in a first artery and partially in a third artery. The device can be expanded radially outwardly from a first position to a second position to engage an inner surface of the first artery and an inner surface of the third artery, so as to maintain a fluid pathway through said arteries. Further, the device can be positioned such that, when the device is in the second position, a porous membrane of the device is located at a neck of the aneurysm.

Claims

1. A medical device for treating a bifurcation or trifurcation aneurysm, in a patient, occurring at a first artery, the first artery and a second artery joining to a third artery, the device comprising:

an expandable latticework frame having first and second struts that each define a radially outermost edge, a radially innermost edge, a circumferential strut width, and a wall thickness between the radially outermost and innermost edges; and

a porous membrane that extends around and between the first and second struts, the membrane having a web portion that, between the first and second struts, extends only within a central region being (i) bounded radially between the radially outermost edges and the radially innermost edges of the first and second struts and (ii) bounded circumferentially between the first and second struts, the web portion defining a web thickness that is less than the wall thickness of the first or second struts,

wherein the porous membrane includes a first layer attached to the outer surface of the expandable latticework frame, an intermediate layer attached to the first layer, and a second layer covering the first layer and the intermediate layer, and

wherein the membrane is configured to (i) reduce blood supply into the aneurysm, and (ii) permit blood supply through pores of the membrane and into perforators and/or microscopic branches of the first artery so as not to inhibit blood supply functions of the perforators and/or microscopic branches.

2. The device of claim 1, wherein the pores are between 20 and 100 microns in size.

3. The device of claim 1, wherein a distance between adjacent pores of the membrane does not exceed 100 microns.

4. The device of claim 2, wherein a distance between adjacent pores of the membrane does not exceed 75 microns.

5. The device of claim 1, wherein the first strut is spaced from the second strut at an interstitial spacing that is greater than the strut width of the first or second struts.

6. The device of claim 1, wherein the membrane completely surrounds each of the first and second struts.

7. The device of claim 1, wherein the wall thickness of the struts is less than or equal to 0.0028″

.

8. The device of claim 1, wherein the membrane comprises a single sheet web portion.

9. The device of claim 1, wherein the porous membrane has a substantially uniform porosity.

10. The device of claim 1, wherein the membrane comprises a plurality of polymeric strips.

11. A stent device for treating an aneurysm, in a patient, the device comprising:

an expandable latticework frame having struts that each define an axial strut width, a radially outermost edge, a radially innermost edge, and a wall thickness defined between the radially outermost edge and the radially innermost edge, the frame defining a plurality of central regions that are each (i) bounded radially between the radially outermost edges and the radially innermost edges of respective, adjacent struts and (ii) bounded circumferentially and axially between the respective, adjacent struts; and

a porous membrane attached to the frame and extending circumferentially only in the central regions between the struts, wherein a thickness of the membrane in the central regions is less than the wall thickness of the struts, wherein the porous membrane includes a first layer attached to the outer surface of the expandable latticework frame, an intermediate layer attached to the first layer, and a second layer covering the first layer and the intermediate layer.

12. The device of claim 11, wherein the membrane has pores between 20 and 100 microns in size.

13. The device of claim 11, wherein a distance between adjacent pores of the membrane does not exceed 100 microns.

14. The device of claim 11, wherein a distance between adjacent pores of the membrane does not exceed 75 microns.

15. The device of claim 11, wherein a first of the struts is spaced from a second of the struts at an interstitial spacing that is greater than the axial strut width of the first or second struts.

16. The device of claim 11, wherein the porous membrane has a substantially uniform porosity.

17. The device of claim 11, wherein the wall thickness of the struts is less than or equal to 0.0028″

.

18. The device of claim 11, wherein the membrane comprises a single sheet web portion.

19. The device of claim 11, wherein the membrane comprises a plurality of polymeric strips.

20. The device of claim 11, wherein the membrane completely surrounds one or more of the struts.