Antenna stent device for wireless, intraluminal monitoring

• US 20050080346A1
• Filed: 09/13/2004
• Published: 04/14/2005
• Est. Priority Date: 12/16/2002
• Status: Active Grant

• Current Assignee: University of Michigan
• Original Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Inventors: Gianchandani, Yogesh B., Takahata, Kenichi, Wise, Kensall D., DeHennis, Andrew D.
• Granted Patent: US 7,452,334 B2
• Time in Patent Office: Days
• US Class Current: 600/486
• 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: B23H 9/00 Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects heat treatment by cathodic discharge C21D1/38

Abstract

Disclosed herein is a stent device useful for maintaining the patency of a lumen while monitoring an intraluminal characteristic. The device includes a structure having a set of extendible bands that are capable of plastic deformation to form a scaffolding having an inductance, and further includes a capacitance coupled to the set of extendible bands and responsive to the intraluminal characteristic. The capacitance and the inductance form a tank circuit after the plastic deformation of the set of extendible bands to enable wireless transmission of an indication of the intraluminal characteristic.

Claims

1. A stent device, comprising:

a structure comprising a set of extendible bands that are capable of plastic deformation to form a scaffolding having an inductance; and

a capacitance coupled to the set of extendible bands such that the capacitance and the inductance form a tank circuit after the plastic deformation of the set of extendible bands.

2. The stent device of claim 1, wherein the structure comprises a longitudinal beam coupled to the set of extendible bands.

3. The stent device of claim 2, wherein the longitudinal beam comprises a side beam having a reduced-width link between adjacent bands of the set of extendible bands such that the reduced-width link breaks a connection between the adjacent bands upon plastic deformation of the structure.

4. The stent device of claim 2, wherein the longitudinal beam and the set of extendible bands are directly connected by a single link.

5. The stent device of claim 2, wherein the structure comprises a further set of extendible bands such that the scaffolding comprises a further inductance, the stent device further comprising a further capacitance coupled to the further set of extendible bands such that the further capacitance and the further inductance form a further tank circuit after plastic deformation of the further set of extendible bands.

6. The stent device of claim 5, wherein the longitudinal beam is a common electrical node for the first-named and further named inductances and the first-named and further named capacitances.

7. The stent device of claim 6, wherein the first-named and further capacitances comprise first and second capacitive sensors, respectively, and wherein the first and second capacitive sensors are disposed at opposite ends of the longitudinal beam.

8. The stent device of claim 7, wherein the longitudinal beam has a length such that the opposite ends of the longitudinal beam are positioned beyond where an expandable deployment device is disposed during the plastic deformation of the structure.

9. The stent device of claim 8, wherein the structure comprises first and second platforms upon which the first and second capacitive sensors are mounted, respectively.

10. The stent device of claim 1, wherein the set of extendible bands comprises a non-conductive support and a conductive trace disposed on the non-conductive support.

11. The stent device of claim 1, wherein the scaffolding comprises a helix portion and a ring portion such that the ring portion provides structural support at an end of the helix portion.

12. The stent device of claim 1, wherein the set of extendible bands has a non-helical configuration prior to the plastic deformation and wherein a portion of the non-helical configuration forms the scaffolding upon deployment.

13. The stent device of claim 12, wherein the non-helical configuration is planar such that each extendible band of the set of extendible bands comprises a plurality of involute, planar sections prior to plastic deformation.

14. The stent device of claim 12, wherein the non-helical configuration is tubular.

15. A device for maintaining patency of a lumen while monitoring an intraluminal characteristic of the lumen, comprising:

a sensor responsive to the intraluminal characteristic of the lumen to generate a signal indicative thereof; and

a stent structure having a non-helical configuration prior to deployment wherein the non-helical configuration of the stent structure is capable of plastic deformation to form a helical scaffolding upon deployment such that the helical scaffolding comprises an inductance coupled to the sensor for wireless transmission of the signal.

16. The device of claim 15, wherein the non-helical configuration comprises a planar set of involute bands.

17. The device of claim 15, wherein the non-helical configuration comprises a plurality of cross bands coupled via a beam having a breakable link for disconnecting adjacent cross bands of the plurality of cross bands upon deployment to form the helical scaffolding.

18. The device of claim 15, wherein the stent structure is further capable of plastic deformation to form a non-helical scaffolding structurally coupled to the helical scaffolding for maintaining the patency of the lumen.

19. The device of claim 18, wherein the non-helical scaffolding comprises a pair of rings coupled to the helical scaffolding at respective longitudinal ends of the helical scaffolding.

20. The device of claim 15, wherein the stent structure comprises a non-conductive support and a conductive trace disposed on the non-conductive support.

21. The device of claim 15, wherein the sensor is an upstream sensor, the stent device further comprises a downstream sensor, and the stent structure includes a further helical scaffolding dedicated to the downstream sensor such that the further helical scaffolding comprises a further inductance for wireless transmission of a signal generated by the downstream sensor.

22. The device of claim 21, wherein a longitudinal interconnect beam acts as a common electrical node for the upstream sensor, the downstream sensor, and the first-named inductance and the further inductance.

23. A device for maintaining patency of a lumen while monitoring an intraluminal characteristic of the lumen, comprising:

a sensor responsive to the intraluminal characteristic of the lumen to generate a signal indicative thereof; and

a scaffolding deployed in the lumen and having a helical portion and a non-helical portion wherein the helical portion comprises an inductance coupled to the sensor for wireless transmission of the signal and wherein the non-helical portion provides structural support for maintaining the patency of the lumen.

24. The device of claim 23, wherein the scaffolding comprises a set of extendible bands.

25. The device of claim 24, wherein the scaffolding comprises a side beam having a plurality of broken links that disconnect adjacent bands of the set of extendible bands to form the helical portion.

26. The device of claim 23, wherein the non-helical portion comprises a pair of rings coupled to the helical portion at respective longitudinal ends of the helical portion.

27. The device of claim 26, wherein the sensor is longitudinally disposed outside of one of the pair of rings.

28. The device of claim 23, wherein the sensor is an upstream sensor, the stent device further comprising a downstream sensor responsive to a further intraluminal characteristic, and wherein the helical portion of the scaffolding comprises a further inductance coupled to the downstream sensor.

29. The device of claim 28, wherein each of the first-named and further inductances has a respective and differing number of coil turns for separate wireless transmission at different resonant frequencies.

30. The device of claim 28, wherein the scaffolding comprises a longitudinal beam coupled to the helical portion.

31. The device of claim 30, wherein the longitudinal beam acts as a common electrical node for the upstream and downstream sensors, and the first-named and further inductances.

32. The device of claim 31, wherein the upstream and downstream sensors comprise capacitive pressure sensors such that the first-named intraluminal characteristic is an upstream pressure and the further intraluminal characteristic is a downstream pressure.

33. The device of claim 23, wherein the helical portion comprises a non-conductive support and a conductive trace disposed on the non-conductive support.

34. The device of claim 23, wherein the helical and non-helical portions of the scaffolding are formed of a continuous tubular sheet.

35. A stent device for monitoring an intraluminal characteristic, comprising:

a plastically deformable structure having a helical portion upon catheter-based deployment wherein the plastically deformable structure comprises a sensor site positioned at an end of the plastically deformable structure; and

a sensor capable of generating a signal indicative of the intraluminal characteristic wherein the sensor is structurally coupled to the plastically deformable structure at the sensor site such that the sensor is suitably disposed for the catheter-based deployment with the plastically deformable structure;

wherein the helical portion comprises an inductance coupled to the sensor to enable wireless transmission of the signal generated by the sensor.

36. The stent device of claim 35, wherein the plastically deformable structure comprises a longitudinal beam and the end is located at a termination point of the longitudinal beam.

37. The stent device of claim 35, wherein the end lies beyond an extent reached by an inflatable deployment device used during the catheter-based deployment.

38. The stent device of claim 35, wherein the sensor site comprises a platform upon which the sensor is mounted.

39. The stent device of claim 38, wherein the plastically deformable structure and the platform are formed of a continuous, conductive sheet such that the plastically deformable structure is capable of residing in a non-helical profile that enables catheter-based deployment.

40. The stent device of claim 39, wherein the platform and the sensor are rigidly bonded such that the sensor is protected from damage from bending forces experienced during the catheter-based deployment.

41. The stent device of claim 35, wherein the end is an upstream end and the sensor is an upstream sensor, the stent device further comprising a downstream sensor disposed at a further sensor site positioned at a downstream end of the plastically deformable structure

42. The stent device of claim 41, wherein the plastically deformable structure comprises first and second inductive coils coupled to the upstream and downstream sensors, respectively.

43. The stent device of claim 42, wherein the plastically deformable structure comprises a longitudinal beam, and wherein the longitudinal beam acts as a common node electrical node for the upstream sensor, the downstream sensor, and the first and second inductive coils.

44. The stent device of claim 43, wherein the plastically deformable structure comprises first and second rings coupled to ends of the first and second inductive coils, respectively.

45. The stent device of claim 44, wherein the first and second inductive coils comprise first and second sets of extendible bands, respectively.

46. The stent device of claim 35, wherein the helical portion comprises a non-conductive support and a conductive trace disposed on the non-conductive support.

47. The stent device of claim 35, wherein the plastically deformable structure is formed of a continuous tubular sheet.

48. A stent device for monitoring first and second intraluminal characteristics, comprising:

first and second sensors generating respective signals indicative of the first and second intraluminal characteristics, respectively; and

a scaffolding comprising first and second inductive coils respectively coupled to the first and second sensors for separate, wireless transmission of the respective signals indicative of the first and second intraluminal characteristics.

49. The stent device of claim 48, wherein the scaffolding comprises a longitudinal interconnect beam that acts as a common electrical node for the first and second sensors and the first and second inductive coils.

50. The stent device of claim 48, further comprising first and second platforms upon which the first and second sensors are mounted, respectively, and wherein the first and second platforms are spaced upstream and downstream from the scaffolding via first and second interconnects, respectively.

51. The stent device of claim 50, wherein the first and second coils, the first and second interconnects, and the first and second platforms are formed of a continuous, conductive sheet.

52. The stent device of claim 51, wherein the continuous, conductive sheet has a tubular shape prior to deployment.

53. The stent device of claim 48, wherein the scaffolding comprises first and second rings coupled to ends of the first and second inductive coils, respectively.

54. The stent device of claim 48, wherein the first and second inductive coils comprise a plurality of extendible bands and wherein the scaffolding comprises a common electrical node and a connection between the plurality of extendible bands and the common electrical node, the connection defining first and second sets of extendible bands of the plurality of extendible bands wherein the first and second sets of extendible bands form the first and second inductive coils, respectively.

55. The stent device of claim 54, wherein the connection is not centered such that the first and second sets of extendible bands have a differing number of turns and a differing inductance level, and further such that the respective signals indicative of the first and second intraluminal characteristics are transmitted at different frequencies.

56. The stent device of claim 48, wherein the first and second sensors comprise respective pressure sensors such that the first and second intraluminal characteristics comprise upstream and downstream intraluminal pressures.

57. The stent device of claim 48, wherein the scaffolding comprises a non-conductive support and a conductive trace disposed on the non-conductive support.