Medical device with position sensor having accuracy at high temperatures

• US 7,286,868 B2
• Filed: 06/15/2001
• Issued: 10/23/2007
• Est. Priority Date: 06/15/2001
• Status: Active Grant

• Current Assignee: Biosense, Inc. (Cardinal Health, Inc.)
• Original Assignee: Biosense, Inc. (Cardinal Health, Inc.)
• Inventors: Govari, Assaf
• Primary Examiner(s): Smith; Ruth S.
• Application Number:
  US09/882,127
• Publication Number:
  US 20030036695A1
• Time in Patent Office: 2,321 Days
• Field of Search: 600/424, 600/422, 600/409, 600/407, 324/244, 324/260, 324/207.13, 324/207.15, 702/94, 702/150, 128/899
• US Class Current: 600/424
• CPC Class Codes: A61B 2560/0252 using ambient temperature
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/065 Determining position of the probe employing exclusively positioning means located on or in the probe, e.g. using position sensors arranged on the probe
• CPC Class Codes: G01B 7/003 for measuring position, not involving coordinate determination coordinate measuring G01B7/004
• CPC Class Codes: G01B 7/004 for measuring coordinates of points
• CPC Class Codes: G01B 7/30 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: G01D 5/2006 by influencing the self-induction of one or more coils G01D5/22 takes precedence
• CPC Class Codes: G01V 3/081 the magnetic field is produced by the objects or geological structures characterised by the method of magnetic field measurement G01R33/00

Abstract

A medical device and position sensor combination for use in medical applications comprises a position sensor having a core made of a high permeable material The core material is made of a Wiegand effect material comprising a mixture of cobalt, vanadium, and iron. The position sensor has an outer diameter of approximately 0.4 mm and is used in a medical device having an outer diameter of approximately 0.67 mm.

Claims

1. A medical device and position sensor combination comprising:

(a) a medical device having a body;

(b) a position sensor attached to the body, the position sensor having a core made of a Wiegand effect material, and a winding circumferentially positioned around the core, the position sensor being used for determining position coordinates of the portion of the body of the medical device, the position senor maintaining accuracy of ≦

1 mm at temperatures greater than 75°

C.

2. The combination according to claim 1, wherein the winding is attached to the core.

3. The combination according to claim 1, wherein the position sensor is also used to determine orientation coordinates of the portion of the body of the medical device.

4. The combination according to claim 3, wherein the position sensor has an accuracy within approximately 0.5 mm.

5. The combination according to claim 1, wherein the position sensor maintains accuracy of ≦

1 mm at temperatures at approximately 80°

C.

6. The combination according to claim 1, wherein the core has an outer diameter less than approximately 0.3 mm.

7. The combination according to claim 6, wherein the core has an outer diameter of about 0.25 mm.

8. The combination according to claim 7, wherein the winding is attached to the core.

9. The combination according to claim 8, wherein a combination of the core and the winding has an outer diameter less than approximately 0.5 mm.

10. The combination according to claim 9, wherein the combination of the core and the winding have an outer diameter of about 0.4 mm.

11. The combination according to claim 10, wherein the material of the core comprises cobalt.

12. The combination according to claim 11, wherein the material of the core further comprises vanadium.

13. The combination according to claim 12, wherein the material of the core further comprises iron.

14. The combination according to claim 13, wherein the material of the core comprises approximately 20%-80% cobalt.

15. The combination according to claim 13, wherein the material of the core comprises approximately 2%-20% vanadium.

16. The combination according to claim 13, wherein the material of the core comprises approximately 25%-50% iron.

17. The combination according to claim 13, wherein the material of the core comprises approximately 52% cobalt, 10% vanadium and 38% iron.

18. The combination according to claim 8, wherein the winding is made of copper.

19. A medical device and position sensor combination comprising:

(a) a medical device having a body;

(b) a position sensor attached to the body, the position sensor having a core made of a high permeable material, the material being a magnetic material that produces a magnetic field that switches polarity and causes a substantially uniform voltage pulse upon an application of an external field, the position sensor being used for determining postion coordinates of the portion of the body of the medical device, the position sensor maintaining accuracy at ≦

1 mm at temperatures greater than 75°

C.

20. The combination according to claim 19, wherein the position sensor further includes a winding positioned around the core.

21. The combination according to claim 20, wherein the position sensor further includes a winding positioned around the core.

22. The combination according to claim 19, wherein the position sensor is also used to determine orientation coordinates of the portion of the body of the medical device.

23. The combination according to claim 22, wherein the position sensor has an accuracy within approximately 0.5 mm.

24. The combination according to claim 19, wherein the position sensor maintains accuracy at ≦

1 mm at temperatures at approximately 80°

C.

25. The combination according to claim 19, wherein the core has an outer diameter less than approximately 0.3 mm.

26. The combination according to claim 25, wherein the core has an outer diameter of about 0.25 mm.

27. The combination according to claim 26, wherein the winding is made of wire.

28. The combination according to claim 27, wherein a combination of the core and the winding has an outer diameter less than approximately 0.5 mm.

29. The combination according to claim 28, wherein the combination of the core and the winding have an outer diameter of about 0.4 mm.

30. The combination according to claim 29, wherein the material of the core comprises cobalt.

31. The combination according to claim 30, wherein the material of the core further comprises vanadium.

32. The combination according to claim 31, wherein the material of the core further comprises iron.

33. The combination according to claim 32, wherein the material of the core comprises approximately 20%-80% cobalt.

34. The combination according to claim 32, wherein the material of the core comprises approximately 2%-20% vanadium.

35. The combination according to claim 32, wherein the material of the core comprises approximately 25%-50% iron.

36. The combination according to claim 32, wherein the material of the core comprises approximately 52% cobalt, 10% vanadium and 38% iron.

37. The combination according to claim 27, wherein the wire winding is made of copper.

38. The combination according to claim 19 wherein the material of the core comprises a copper, nickel and iron alloy (CuNiFe).

39. The combination according to claim 19, wherein the material of the core comprises an iron, chrome and cobalt alloy.