Conductive tip catheter

1. A conductive tip catheter, comprising:

a flexible tubular member comprising a proximal end and a distal end, the flexible tubular member defining a lumen extending between the proximal end and the distal end;

an electrically conductive metallic coil at least partially located within the lumen of the flexible tubular member, the electrically conductive metallic coil comprising:

a first region located at a distal end of the metallic coil and having a first pitch, wherein the first region extends distally from the distal end of the flexible tubular member;

a second region proximal to the first region and having a second pitch that is greater than the first pitch; and

a third region proximal to the second region and having a third pitch that is different from the first pitch and the second pitch; and

a conductive tip located at the distal end of the flexible tubular member, the conductive tip defining a tip lumen in fluid communication with the lumen, wherein the conductive tip comprises a conductive polymer being carbon-filled polyurethane.

2. The conductive tip catheter of claim 1 , wherein the conductive tip is welded to the first region of the electrically conductive metallic coil.

3. The conductive tip catheter of claim 2 , wherein the conductive tip is welded over the first region of the electrically conductive metallic coil.

4. The conductive tip catheter of claim 3 , wherein the conductive tip is radio frequency welded over the first region of the electrically conductive metallic coil.

5. The conductive tip catheter of claim 1 , wherein an inner diameter of the tip lumen is smaller than an outer diameter of the first region of the electrically conductive metallic coil.

6. The conductive tip catheter of claim 1 , wherein an inner diameter of the tip lumen is equal to an outer diameter of the first region of the electrically conductive metallic coil.

7. The conductive tip catheter of claim 1 , wherein the flexible tubular member comprises polyurethane.

8. The conductive tip catheter of claim 1 , further comprising a safety ribbon located within the lumen of the flexible tubular member.

9. The conductive tip catheter of claim 8 , wherein the safety ribbon comprises a metallic wire.

10. The conductive tip catheter of claim 8 , wherein the safety ribbon is coupled to the electrically conductive metallic coil at a distal region of the electrically conductive metallic coil and a proximal region of the electrically conductive metallic coil.

11. The conductive tip catheter of claim 1 , wherein the flexible tubular member further comprises a plurality of depth markers on an exterior surface of the flexible tubular member.

12. The conductive tip catheter of claim 1 , wherein the conductive tip has a rounded distal end.

13. The conductive tip catheter of claim 1 , wherein a proximal end of the electrically conductive metallic coil extends proximally from the proximal end of the flexible tubular member.

14. The conductive tip catheter of claim 13 , wherein the proximal end of the electrically conductive metallic coil is connected to an electrical current source.

15. The conductive tip catheter of claim 1 , wherein the electrically conductive metallic coil directly connects to the flexible tubular member at each point of contact between the electrically conductive metallic coil and the flexible tubular member.

16. The conductive tip catheter of claim 1 , wherein the third pitch is less than the second pitch.

17. The conductive tip catheter of claim 1 , wherein the third pitch is greater than the first pitch.

18. The conductive tip catheter of claim 1 , wherein the electrically conductive metallic coil further comprises a fourth region proximal to the third region and having a fourth pitch that is greater than the third pitch.

19. The conductive tip catheter of claim 18 , wherein the electrically conductive metallic coil further comprises a fifth region proximal to the fourth region and having a fifth pitch that is less than the fourth pitch.

20. The conductive tip catheter of claim 1 , wherein a proximal end of the conductive tip catheter is connected to a fluid source in fluid communication with the lumen of the flexible tubular member.

21. The conductive tip catheter of claim 20 , wherein the fluid source is an anesthetic.

22. A conductive tip catheter, comprising:

a flexible tubular member comprising a proximal end and a distal end, the flexible tubular member defining a lumen extending between the proximal end and the distal end;

an electrically conductive metallic coil at least partially located within the lumen of the flexible tubular member, the metallic coil comprising:

a first region located at a distal end of the metallic coil and having a first pitch;

a second region proximal to the first region and having a second pitch that is greater than the first pitch; and

a third region proximal to the second region and having a third pitch that is less than the second pitch;

a conductive tip made from carbon-filled polyurethane and welded over and around the first region of the metallic coil through radio frequency welding, the conductive tip defining a tip lumen in fluid communication with the lumen; and

a safety ribbon located within the lumen of the flexible tubular member, the safety ribbon coupled to the electrically conductive metallic coil at a distal region of the electrically conductive metallic coil and a proximal region of the electrically conductive metallic coil,

wherein the electrically conductive metallic coil directly connects to the flexible tubular member at each point of contact between the electrically conductive metallic coil and the flexible tubular member.