Medical devices having a releasable member and methods of using the same

1. A medical device comprising:

an elongate member having a first proximal end, a first distal end, a proximal portion and a shaft extending from the proximal portion, the proximal portion having a first outside diameter, the shaft having a second proximal end attached to the proximal portion and a second distal end, the shaft having a second outside diameter that is less than the first outside diameter of the proximal portion;

an intermediate member releasably attached to the elongate member and releasably disposed on the shaft, the intermediate member having a third proximal end disposed between the first proximal end and the first distal end, a third distal end, a third outside diameter, and an intermediate member body defining an intermediate member lumen, the third outside diameter being greater than the first outside diameter of the proximal portion, the intermediate member lumen having a first inside diameter that is less than the first outside diameter of the proximal portion;

a cap releasably attached to the intermediate member and releasably disposed on the shaft, the cap having a third fourth proximal end, a fourth distal end, and a cap body defining a cap lumen; and

a sheath partially disposed between the intermediate member and the cap and disposed on the shaft, the sheath having a fifth proximal end, a fifth distal end, and a sheath body defining a first sheath opening on the fifth proximal end of the sheath, a second sheath opening on the fifth distal end of the sheath, and a sheath lumen extending from the first sheath opening to the second sheath opening, the first sheath opening having a second inside diameter that is greater than the first inside diameter of the intermediate member lumen.

2. The medical device of claim 1 , wherein the intermediate member has an outer surface having a first tapered portion, the first tapered portion of the intermediate member disposed within the sheath lumen.

3. The medical device of claim 2 , wherein the sheath has a tapered proximal portion;

wherein the cap has an inner surface having a second tapered portion; and

wherein the sheath contacts the first tapered portion of the intermediate member and the second tapered portion of the cap.

4. The medical device of claim 1 , wherein the cap is formed of a first material;

wherein the sheath is formed of a second material; and

wherein the second material is relatively more flexible than the first material.

5. The medical device of claim 1 , wherein the cap is formed of a first material having a first durometer hardness;

wherein the sheath is formed of a second material having a second durometer hardness; and

wherein the first durometer hardness is greater than the second durometer hardness.

6. The medical device of claim 1 , wherein the intermediate member has an outer surface and the intermediate member body defines threads on the outer surface; and

wherein the cap has an inner surface and the cap body defines threads on the inner surface, the threads defined by the cap body sized and configured to mate with the threads defined by the intermediate member body.

7. The medical device of claim 1 , wherein the intermediate member has a lengthwise axis and an outer surface, the intermediate member having a protuberance on the outer surface that extends away from the lengthwise axis of the intermediate member, the protuberance defined between the third proximal end and the third distal end;

wherein the cap has a lengthwise axis and an inner surface, the cap body defining a recess on the inner surface that extends away from the lengthwise axis of the cap, the recess defined between the fourth proximal end and the fourth distal end; and

wherein the protuberance defined by the intermediate member is disposed within the recess defined by the cap.

8. The medical device of claim 1 , wherein the intermediate member body defines a second intermediate member lumen disposed between the third proximal end and the third distal end, the second intermediate member lumen in fluid communication with the intermediate member lumen.

9. The medical device of claim 1 , wherein the intermediate member has a lengthwise axis and an inner surface, the intermediate member body defining a recess on the inner surface that extends away from the lengthwise axis of the intermediate member;

wherein the shaft has a lengthwise axis and an outer surface, the shaft having a protuberance on the outer surface that extends away from the lengthwise axis of the shaft, the protuberance disposed between the second proximal end and the second distal end; and

wherein the protuberance of the shaft is disposed within the recess defined by the intermediate member.

10. The medical device of claim 1 , wherein the shaft has a first length extending from the second proximal end to the second distal end;

wherein the sheath has a second length extending from the fifth proximal end to the fifth distal end; and

wherein the first length of the shaft is greater than the second length of the sheath.

11. The medical device of claim 1 , wherein the sheath is a tubular member.

12. A medical device comprising:

an elongate member having a first proximal end, a first distal end, a proximal portion and a shaft extending from the proximal portion, the proximal portion having a first outside diameter, the shaft having a second proximal end attached to the proximal portion and a second distal end, the shaft having a second outside diameter that is less than the first outside diameter of the proximal portion;

an intermediate member releasably attached to the elongate member and releasably disposed on the shaft, the intermediate member having a third proximal end disposed between the first proximal end and the first distal end, a third distal end, a third outside diameter, an outer surface, and an intermediate member body defining an intermediate member lumen, the third outside diameter being greater than the first outside diameter of the proximal portion, the outer surface having a first tapered portion, the intermediate member lumen having a first inside diameter that is less than the first outside diameter of the proximal portion;

a cap releasably attached to the intermediate member and releasably disposed on the shaft, the cap having a fourth proximal end, a fourth distal end, an inner surface, and a cap body defining a cap lumen, the inner surface having a second tapered portion, the cap formed of a first material; and

a sheath disposed between and contacting the first tapered portion of the intermediate member and the second tapered portion of the cap, the sheath disposed on the shaft and having a fifth proximal end, a fifth distal end, a tapered proximal portion, and a sheath body defining a first sheath opening on the fifth proximal end of the sheath, a second sheath opening on the fifth distal end of the sheath, and a sheath lumen extending from the first sheath opening to the second sheath opening, the first sheath opening having a second inside diameter that is greater than the first inside diameter of the intermediate member lumen, the sheath formed of a second material;

wherein the first tapered portion of the intermediate member is disposed within the sheath lumen; and

wherein the second material is relatively more flexible than the first material.

13. The medical device of claim 12 , wherein the first material has a first durometer hardness;

wherein the second material has a second durometer hardness; and

wherein the first durometer hardness is greater than the second durometer hardness.

14. The medical device of claim 12 , wherein the intermediate member body defines threads on the outer surface; and

wherein the cap body defines threads on the inner surface, the threads defined by the cap body sized and configured to mate with the threads defined by the intermediate member body.

15. The medical device of claim 12 , wherein the intermediate member has a lengthwise axis, the intermediate member having a protuberance on the outer surface that extends away from the lengthwise axis of the intermediate member, the protuberance defined between the third proximal end and the third distal end;

wherein the cap has a lengthwise axis, the cap body defining a recess on the inner surface that extends away from the lengthwise axis of the cap, the recess defined between the fourth proximal end and the fourth distal end; and

wherein the protuberance defined by the intermediate member is disposed within the recess defined by the cap.

16. The medical device of claim 12 , wherein the intermediate member body defines a second intermediate member lumen disposed between the third proximal end and the third distal end, the second intermediate member lumen in fluid communication with the intermediate member lumen.

17. The medical device of claim 12 , wherein the intermediate member has a lengthwise axis and an inner surface, the intermediate member body defining a recess on the inner surface that extends away from the lengthwise axis of the intermediate member;

wherein the shaft has a lengthwise axis and an outer surface, the shaft having a protuberance on the outer surface that extends away from the lengthwise axis of the shaft, the protuberance disposed between the second proximal end and the second distal end; and

wherein the protuberance of the shaft is disposed within the recess defined by the intermediate member.

18. The medical device of claim 12 , wherein the shaft has a first length extending from the second proximal end to the second distal end;

wherein the sheath has a second length extending from the fifth proximal end to the fifth distal end; and

wherein the first length of the shaft is greater than the second length of the sheath.

19. The medical device of claim 12 , wherein the sheath is a tubular member.

20. A medical device comprising:

an elongate member having a first proximal end, a first distal end, a proximal portion and a shaft extending from the proximal portion, the proximal portion having a first outside diameter, the shaft having a lengthwise axis, a second proximal end attached to the proximal portion, a second distal end, an outer surface, and a protuberance, the shaft having a second outside diameter that is less than the first outside diameter of the proximal portion, the protuberance disposed on the outer surface of the shaft and extending away from the lengthwise axis of the shaft, the protuberance disposed between the second proximal end and the second distal end;

an intermediate member releasably attached to the elongate member and releasably disposed on the shaft, the intermediate member having a lengthwise axis, a third proximal end disposed between the first proximal end and the first distal end, a third distal end, a third outside diameter, an outer surface, an inner surface, and an intermediate member body defining an intermediate member lumen, threads, and a recess, the third outside diameter being greater than the first outside diameter of the proximal portion, the outer surface having a first tapered portion, the intermediate member lumen having a first inside diameter that is less than the first outside diameter of the proximal portion, the threads of the intermediate member defined on the outer surface of the intermediate member, the recess defined on the inner surface and extending away from the lengthwise axis of the intermediate member;

a cap releasably attached to the intermediate member and releasably disposed on the shaft, the cap having a fourth proximal end, a fourth distal end, an inner surface, and a cap body defining a cap lumen and threads, the inner surface having a second tapered portion, the cap formed of a first material, the threads of the cap defined on the inner surface of the cap, the threads of the cap sized and configured to mate with the threads defined by the intermediate member body; and

a sheath disposed between and contacting the first tapered portion of the intermediate member and the second tapered portion of the cap, the sheath disposed on the shaft and having a fifth proximal end, a fifth distal end, a tapered proximal portion, and a sheath body defining a first sheath opening on the fifth proximal end of the sheath, a second sheath opening on the fifth distal end of the sheath, and a sheath lumen extending from the first sheath opening to the second sheath opening, the first sheath opening having a second inside diameter that is greater than the first inside diameter of the intermediate member lumen, the sheath formed of a second material;

wherein the first tapered portion of the intermediate member is disposed within the sheath lumen;

wherein the second material is relatively more flexible than the first material; and

wherein the protuberance of the shaft is disposed within the recess defined by the intermediate member.