Medical device having flexible distal tip

1. A medical device, comprising:

an elongate member having a proximal portion with a substantially solid cross-section and a distal tip portion;

wherein the distal tip portion includes an outer member, wherein the outer member comprises a polymeric sheath that has a proximal end that remains outside a vasculature of a patient and has a distal end that is insertable into, navigable through, and removable from the vasculature of the patient; and

one or more balls non-removably disposed within the outer member;

wherein the balls are disposed within a lumen defined by the outer member and wherein the balls are tightly packed within the outer member such that outer surfaces of adjacent balls are in direct contact with each other;

wherein the one or more balls are free of direct attachment to any other structure of the medical device.

2. The medical device in accordance with claim 1 , wherein at least one or more of the balls comprise metal or metal alloy.

3. The medical device in accordance with claim 1 , wherein at least one or more of the balls comprise polymer, glass, or ceramic.

4. The medical device in accordance with claim 1 , wherein the balls are spherical.

5. The medical device in accordance with claim 1 , wherein the balls are non-spherical.

6. A medical device, comprising:

an elongate member having a proximal portion and a distal tip portion;

wherein the distal tip portion includes an outer member;

one or more balls non-removably disposed within the outer member and tightly packed within the outer member such that outer surfaces of adjacent balls are in direct contact with each other, wherein the one or more balls are free of direct attachment to any other structure of the medical device; and

wherein the outer member comprises a coil.

7. The medical device in accordance with claim 6 , further comprising a distal solder tip disposed at a distal end of the outer member.

8. The medical device in accordance with claim 6 , further comprising a proximal weld disposed at a proximal end of the outer member to attach the outer member to the elongate member.

9. A medical device, comprising:

an elongate shaft having a proximal end with a substantially solid cross-section and a distal end; and

a distal tip disposed near the distal end, the distal tip including an enclosure having one or more beads non-removably disposed therein, wherein the enclosure comprises a polymeric sheath that has a proximal end that remains outside a vasculature of a patient and has a distal end that is insertable into, navigable through, and removable from the vasculature of the patient, and wherein the beads are tightly packed within the enclosure relative to each other such that outer surfaces of adjacent beads are in direct contact with each other and the enclosure is substantially filled with beads;

wherein the one or more beads are free of direct attachment to any other structure of the medical device.

10. The medical device in accordance with claim 9 , wherein the beads comprise metal or metal alloy.

11. The medical device in accordance with claim 9 , wherein the beads comprise polymer, ceramic, or glass.

12. The medical device in accordance with claim 9 , wherein the beads are spherical.

13. The medical device in accordance with claim 9 , wherein the beads are non-spherical.

14. A medical device, comprising:

an elongate shaft having a proximal end and a distal end;

a distal tip disposed near the distal end, the distal tip including an enclosure having one or more beads non-removably disposed therein, the one or more beads being tightly packed within the enclosure relative to each other such that outer surfaces of adjacent beads are in direct contact with each other and the enclosure is substantially filled with beads, wherein the one or more beads are free of direct attachment to any other structure of the medical device; and

wherein the enclosure comprises a coil.

15. The medical device in accordance with claim 14 , further comprising a distal solder tip disposed at a distal end of the enclosure.

16. The medical device in accordance with claim 14 , further comprising a proximal weld disposed at a proximal end of the enclosure to attach the enclosure to the elongate shaft.