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Techniques related to coils for medical device are disclosed. One example coil may comprise multiple filars, each being formed of a biocompatible beta titanium alloy having an elastic modulus ranging from 30 GigaPascals (GPa) to 90 GPa and comprising at least two elements from a group consisting of

Techniques related to coils for medical device are disclosed. One example coil may comprise multiple filars, each being formed of a biocompatible beta titanium alloy having an elastic modulus ranging from 30 GigaPascals (GPa) to 90 GPa and comprising at least two elements from a group consisting of titanium, molybdenum, niobium, tantalum, zirconium, chromium, iron and tin. At least one of the multiple filars may be electrically insulated one from another. A structural body, such as a lead body, may carry the coil. One or more filars may carry a low-resistance core.

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1. An implantable medical device (IMD), comprising: a coil comprising multiple filars, each being formed of a biocompatible beta titanium alloy having an elastic modulus ranging from 30 GigaPascals (GPa) to 90 GPa and comprising at least two elements from a group consisting of titanium, molybdenum,

1. An implantable medical device (IMD), comprising: a coil comprising multiple filars, each being formed of a biocompatible beta titanium alloy having an elastic modulus ranging from 30 GigaPascals (GPa) to 90 GPa and comprising at least two elements from a group consisting of titanium, molybdenum, niobium, tantalum, zirconium, chromium, iron and tin, at least one of the multiple filars being electrically insulated from other ones of the filars; anda structural body carrying the coil. 2. The IMD of claim 1, wherein a ratio of pitch of the coil to outer diameter of the coil is greater than one. 3. The IMD of claim 2, wherein the coil comprises at least four filars. 4. The IMD of claim 3, wherein the coil has a pitch of greater than 0.03 inches. 5. The IMD of claim 3, wherein the coil has a pitch of greater than 0.06 inches. 6. The IMD of claim 4, wherein the coil comprises at least eight filars. 7. The IMD of claim 4, wherein the coil comprises twelve filars. 8. The IMD of claim 1, wherein a ratio of pitch of the coil to outer diameter of the coil is greater than two. 9. The IMD of claim 1, wherein the coil has an outer diameter of less than 0.03 inches. 10. The IMD of claim 1, wherein each of the filars carries a respective layer of insulating material to electrically insulate the filar from all others filars. 11. The IMD of claim 10, further comprising multiple elements carried by the structural body, each of the elements being electrically coupled to a different respective one of the filars. 12. The IMD of claim 10, further comprising at least eight electrodes, each of the at least eight electrodes being electrically coupled to a different respective one of the filars. 13. The IMD of claim 12, wherein the at least eight electrodes are segmented electrodes. 14. The IMD of claim 11, wherein at least one of the filars includes a low-resistance core, wherein a ratio of a cross-sectional area of the core to a cross-sectional area of the filar is selected to tune a resistance of the filar to a resistance of a respective one of the elements. 15. The IMD of claim 1, wherein each of the multiple filars includes a respective low-resistance core. 16. The IMD of claim 15, wherein each of the low-resistance cores is formed of a material having a resistivity of less than 25 micro-ohm-cm. 17. The IMD of claim 16, wherein the low-resistance core is formed of silver, tantalum, a tantalum alloy, niobium, a niobium alloy, platinum, a platinum alloy, palladium, or a palladium alloy. 18. The IMD of claim 1, wherein the coil defines an inner space, and further comprising a steering device positioned within the inner space. 19. A method, comprising: winding a coil of multiple filars, each being formed of a biocompatible beta titanium alloy having an elastic modulus ranging from 30 GigaPascals (GPa) to 90 GPa and comprising at least two elements from a group consisting of titanium, molybdenum, niobium, tantalum, zirconium, chromium, iron and tin; andproviding at least one of the filars with an insulating layer to electrically insulate the filar from the other filars. 20. The method of claim 19, wherein a ratio of pitch of the coil to outer diameter of the coil is greater than one. 21. The method of claim 20, wherein the coil comprises at least four filars. 22. The method of claim 21, wherein the coil has a pitch of greater than 0.03 inches. 23. The method of claim 21, wherein the coil has a pitch of greater than 0.06 inches. 24. The method of claim 23, wherein the coil comprises at least eight filars. 25. The method of claim 23, wherein the coil comprises twelve filars. 26. The method of claim 19, wherein a ratio of pitch of the coil to outer diameter of the coil is greater than two. 27. The method of claim 19, wherein the coil has an outer diameter of less than 0.03 inches. 28. The method of claim 19, further comprising providing each of the filars with an insulating layer to electrically insulate each filar from all other filars. 29. The method of claim 28, further comprising: providing at least eight electrodes; andelectrically coupling each of the filars to a different respective one of the electrodes. 30. The method of claim 28, further comprising: incorporating the coil into a medical device adapted to perform at least one of delivering therapy to a patient or sensing a signal from the patient; andelectrically coupling one or more of the filars each to a different respective one of multiple elements carried by the medical device. 31. The method of claim 30, further comprising tuning a resistance of the one or more of the filars to each have substantially a same resistance as a resistance of the respective element to which the filar is electrically coupled. 32. The method of claim 31, wherein tuning a resistance comprises: providing a low-resistance core;providing a layer of the beta titanium alloy surrounding the low-resistance core to form a filar; andwherein a ratio of an outer diameter of the core to an outer diameter of the filar is selected to obtain a selected resistance for the filar. 33. A medical electrical lead, comprising: a lead body; anda coil comprising multiple filars, each being formed of a biocompatible beta titanium alloy having an elastic modulus ranging from 30 GigaPascals (GPa) to 90 GPa and comprising at least two elements from a group consisting of titanium, molybdenum, niobium, tantalum, zirconium, chromium, iron and tin, at least one of the multiple filars being electrically insulated from other ones of the filars. 34. The medical electrical lead of claim 33, further comprising at least four electrodes, each being electrically coupled to a different respective one of the multiple filars. 35. The medical electrical lead of claim 33, further comprising at least eight electrodes, each being electrically coupled to a different respective one of the multiple filars. 36. The medical electrical lead of claim 35, wherein a ratio of pitch of the coil to outer diameter of the coil is greater than two. 37. The medical electrical lead of claim 35, wherein the outer diameter of the coil is less than 0.03 inches. 38. The medical electrical lead of claim 33, wherein the coil comprises twelve filars. 39. The medical electrical lead of claim 38, wherein the ratio of pitch of the coil to outer diameter of the coil is at least three. 40. The medical electrical lead of claim 33, wherein the coil has more than four filars and wherein the bend radius at yield for the coil is less than 0.15 inches.