Electromagnetic radiation transparent device and method of making thereof

• US 20050049480A1
• Filed: 08/20/2004
• Published: 03/03/2005
• Est. Priority Date: 08/25/2003
• Status: Abandoned Application

• Current Assignee: Biophan Technologies Incorporated
• Original Assignee: Biophan Technologies Incorporated
• Inventors: Gray, Robert W.
• Application Number:
  US10/922,333
• Publication Number:
  US 20050049480A1
• Time in Patent Office: Days
• US Class Current: 600/407
• CPC Class Codes: A61B 2090/374 NMR or MRI
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• 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 2/90 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 2210/009 magnetic
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/124 of other specific inorganic materials not covered by A61L31/122 or A61L31/123
• CPC Class Codes: A61L 31/18 Materials at least partially X-ray or laser opaque
• CPC Class Codes: A61N 1/16 Screening or neutralising undesirable influences from or using, atmospheric or terrestrial radiation or fields using atmospheric electricity or earth currents H05F3/00
• CPC Class Codes: A61N 2/00 Magnetotherapy
• CPC Class Codes: G01R 33/285 Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR

Abstract

A medical device includes a pattern of electrically conductive material. The pattern of electrically conductive material has an anti-antenna geometrical shape such that the anti-antenna geometrical shape substantially prevents the medical device from creating an imaging artifact and/or substantially allows imaging of a volume within the medical device. The pattern may be formed by multiple “figure-8” shaped electrical conductors, multiple “figure-8” emulating electrical conductors, multiple sine-wave-like shaped electrical conductors, multiple zig-zag patterned electrical conductors, by multiple electrical conductors, each having sequential conductive loops, and/or a single conductor weaved into a loop mesh. The electrically conductive material may be titanium, tantalum, nitinol, stainless steel, and/or NbZr.

Claims

1. A method of fabricating a medical stent, comprising:

(a) cutting a first cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;

(b) cutting a second cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;

(c) positioning the first cylinder into a volume of the second cylinder and positioning the first cylinder with respect to the second cylinder such the nodes of the first cylinder are close to the nodes of the second cylinder without the nodes of the first cylinder touching the nodes of the second cylinder; and

(d) applying a non-conductive binding material to adjacent nodes of the two cylinders.

2. The method as claimed in claim 1, wherein the first cylinder and second cylinder are made of tantalum.

3. The method as claimed in claim 1, wherein the non-conductive binding material is silicon rubber.

4. The method as claimed in claim 1, wherein the non-conductive binding material is a thermoplastic.

5. The method as claimed in claim 1, wherein the non-conductive binding material is a thermoset polymer.

6. The method as claimed in claim 1, wherein the non-conductive binding material is glass.

7. The method as claimed in claim 1, wherein the conductive mesh strands include “

Z”

shaped segments to facilitate radial expansion of the medical stent.

19. The method as claimed in claim 1, wherein the first cylinder and second cylinder are made of nitinol.

20. The method as claimed in claim 1, wherein the first cylinder and second cylinder are made of stainless steel.

21. The method as claimed in claim 1, wherein the first cylinder and second cylinder are made of NbZr.

22. The method as claimed in claim 1, wherein the first cylinder and second cylinder are made of titanium.

8. A method of fabricating a medical stent, comprising:

(a) cutting a first cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;

(b) cutting a second cylinder of electrically conductive material so as to create a first pattern of conductive mesh strands having a plurality of nodes;

(c) positioning the first cylinder into a volume of the second cylinder and positioning the first cylinder with respect to the second cylinder such the nodes of the first cylinder are close to the nodes of the second cylinder without the nodes of the first cylinder touching the nodes of the second cylinder;

(d) positioning a third cylinder of a non-conductive binding material between the first and second cylinders; and

(e) applying heat to the adjacent nodes of the first and second cylinders to cause the non-conductive binding material to bind the adjacent nodes together.

9. The method as claimed in claim 8, wherein the first cylinder and second cylinder are made of tantalum.

10. The method as claimed in claim 8, wherein the non-conductive binding material is silicon rubber.

11. The method as claimed in claim 8, wherein the non-conductive binding material is a thermoplastic.

12. The method as claimed in claim 8, wherein the non-conductive binding material is a thermoset polymer.

13. The method as claimed in claim 8, wherein the non-conductive binding material is glass.

14. The method as claimed in claim 8, wherein the conductive mesh strands include “

Z”

shaped segments to facilitate radial expansion of the medical stent.

15. The method as claimed in claim 8, further comprising:

(e) applying heat to areas of non-adjacent nodes of the first and second cylinders to cause the non-conductive binding material to be removed.

23. The method as claimed in claim 8, wherein the first cylinder and second cylinder are made of nitinol.

24. The method as claimed in claim 8, wherein the first cylinder and second cylinder are made of stainless steel.

25. The method as claimed in claim 8, wherein the first cylinder and second cylinder are made of NbZr.

26. The method as claimed in claim 8, wherein the first cylinder and second cylinder are made of titanium.

16. A method of fabricating a medical stent, comprising:

(a) producing a web of conductive strands wherein at all the cross-over points, a non-conductive material is applied to hold the cross-over point strands in place and to electrically isolate the conductive strands from one another;

(b) cutting a portion of the web to produce a sheet of conductive strands;

(c) forming the sheet of conductive strands into a cylinder shape; and

(d) attaching ends of sheet together to hold the cylinder shape in place.

17. The method as claimed in claim 16, wherein the ends of the sheet are attached with conductive material.

18. The method as claimed in claim 16, wherein the ends of the sheet are attached with non-conductive material.