Boosting catheter and related systems and methods

1 . An extension catheter comprising:

(a) a distal tube comprising:

(i) a tube body;

(ii) a tube lumen defined within the tube body;

(b) a proximal shaft operably coupled to a proximal portion of a wall of the tube body, the proximal shaft comprising:

(i) a first elongate member; and

(ii) a second elongate member disposed such that the second elongate member is parallel with and non-coaxial with the first elongate member,

wherein the second elongate member is coupled to the first elongate member,

wherein the first and second elongate members are configured to extend distally into the wall of the distal tube body, and

wherein at least one of the first and second elongate members has no lumen.

2 . The catheter of claim 1 , wherein the second elongate member is not slidable in relation to the first elongate member.

3 . The catheter of claim 1 , wherein the first elongate member is configured to extend distally into a first portion of the wall of the tube body, and further wherein the second elongate member is configured to extend distally into a second portion of the wall of the tube body.

4 . The catheter of claim 1 , wherein the first elongate member has no lumen and the second elongate member defines a lumen.

5 . The catheter of claim 1 , further comprising at least one support member disposed in the proximal portion of the distal tube.

6 . The catheter of claim 1 , wherein the proximal shaft has a diameter ranging from about 0.01 to about 0.03 inches.

7 . An extension catheter comprising:

(a) a distal tube comprising:

(i) a tube body; and

(ii) a tube lumen defined within the tube body;

(iii) a first opening defined at a first end of the tube body; and

(iv) a second opening defined at a second end of the tube body,

wherein the tube lumen, the first opening, and the second opening are sized and configured to receive an interventional catheter therethrough;

(b) a proximal shaft operably coupled to a proximal portion of a wall of the distal tube body, the proximal shaft comprising:

(i) a first elongate solid member; and

(ii) a second elongate solid member coupled to the first elongate solid member such that the second elongate solid member is parallel with and non-coaxial with the first elongate solid member,

wherein the first and second elongate members are configured to extend distally into the wall of the distal tube body.

8 . The catheter of claim 7 , wherein the tube body is sized to be positionable through a guiding catheter.

9 . The catheter of claim 7 , wherein the second elongate member is not slidable in relation to the first elongate member.

10 . The catheter of claim 7 , further comprising at least one support member disposed in the proximal portion of the tube body.

11 . The catheter of claim 7 , wherein the proximal shaft has a diameter ranging from about 0.01 to about 0.03 inches.

12 . An extension catheter comprising:

(a) a distal tube comprising:

(i) a tube body comprising a tubular wall, the tube body sized to be positionable through a guiding catheter;

11 a tube lumen defined within the tube body by the tubular wall;

iii) a distal opening defined in a distal end of the tube body, the distal opening in fluidic communication with the tube lumen; and

(iv) a proximal opening defined in a proximal end of the tube body, the proximal opening in fluidic communication with the tube lumen,

wherein the tube lumen, the distal opening, and the proximal opening are sized such that an interventional catheter is positionable therethrough;

(b) a proximal shaft operably coupled to a proximal portion of the tubular wall of the distal tube, the proximal shaft comprising:

(i) a first elongate member; and

(ii) a second elongate member disposed adjacent to and attached at an outer surface of the second elongate member to an outer surface of the first elongate member along a length of the first elongate member, wherein the second elongate member is parallel with and non-coaxial with the first elongate member,

wherein the first and second elongate members increase axial manipulability of the distal tube in comparison to a single elongate member,

wherein the first and second elongate members are configured to extend distally into the tubular wall of the distal tube body, and

wherein at least one of the first and second elongate members is solid.

13 . The catheter of claim 12 , wherein the proximal shaft has a diameter ranging from about 0.01 to about 0.03 inches.

14 . The catheter of claim 12 , further comprising at least one support member disposed in the proximal portion of the distal tube.

15 . An extension catheter comprising:

(a) a distal tube comprising:

(i) a tube body; and

( 11 ) a tube lumen defined within the tube body;

(iii) a distal opening defined in a distal end of the tube body, the distal opening in fluidic communication with the tube lumen; and

(iv) a proximal opening defined in a proximal end of the tube body, the proximal opening in fluidic communication with the tube lumen,

wherein the tube lumen, the distal opening, and the proximal opening are sized to be capable of receiving an interventional catheter therethrough;

(b) a proximal shaft operably coupled to a proximal portion of a wall of the distal tube body, the proximal shaft comprising:

(i) a first elongate solid member; and

(ii) a second elongate solid member coupled to the first elongate solid member such that the second elongate solid member is parallel with and non-coaxial with the first elongate solid member,

wherein the first and second elongate members are configured to extend distally into the wall of the distal tube body.

16 . The catheter of claim 15 , wherein the tube body is sized to be positionable through a guiding catheter.

17 . The catheter of claim 15 , wherein the second elongate member is not slidable in relation to the first elongate member.

18 . The catheter of claim 15 , further comprising at least one support member disposed in the proximal portion of the tube body.

19 . The catheter of claim 15 , wherein the proximal shaft has a diameter ranging from about 0.01 to about 0.03 inches.