Coaxial bi-directional catheter
A deflectable catheter including an outer member having a proximal portion and a distal portion, an elongated column member extending distally from the outer member and an inner member positioned coaxial with the outer member and attached to the column member. The inner member extends distally of the outer member and has a distal tip portion. A reinforcement member is positioned over the column member to restrict axial movement of the column member such that when one of the inner member or outer member is moved with respect to the other, axial compression of the column member is restricted by the reinforcement member causing the distal tip portion of the inner member to deflect laterally.
1. A deflectable catheter comprising:
an outer member having a proximal portion and a distal portion;
an inner member having a proximal portion and a distal portion, the inner member positioned coaxially within the outer member, the inner member and outer member relatively movable to effect deflection of a tip of the catheter;
a column member connected to the inner member;
a coil positioned over the column member;
a first stop at the proximal end of the coil configured to limit either one or both of axial proximal movement of the inner member and distal movement of the outer member to enable deflection of the tip in a first direction; and
a second stop configured to limit either one or both of axial distal movement of the inner member and proximal movement of the outer member to enable deflection of the tip in a second direction different than the first direction, the second stop spaced axially from the first stop;
wherein the inner member is rotatable relative to the outer member and the column member turns with the inner member.
2. The deflectable catheter of claim 1 , wherein rotation of the inner member allows 360 degree deflection since the tip can deflect in any plane.
3. The deflectable catheter of claim 1 , wherein the column member is not attached to the outer member.
4. The deflectable catheter of claim 1 , further comprising at least one radiopaque marker band attached to the inner member, the column member attached to the marker band.
5. The deflectable catheter of claim 1 , wherein the second stop is connected to the inner member.
6. The deflectable catheter of claim 1 , wherein the inner member comprises a tube with a series of cuts formed therein.
7. The deflectable catheter of claim 1 , wherein the inner member has a central lumen to receive a guidewire.
8. The deflectable catheter of claim 1 , wherein the outer member has a central longitudinal axis and the column member is radially offset with respect to the central longitudinal axis of the outer member.
9. The deflectable catheter of claim 1 , wherein the inner member and outer member are dimensioned to allow introduction of fluids between an outer wall of the inner member and an inner wall of the outer member.
10. The deflectable catheter of claim 1 , wherein a lumen of the outer member which receives the inner member is lubricated to facilitate movement of the inner member therein.
11. A deflectable catheter comprising:
an outer member having a proximal portion and a distal portion;
an inner member having a proximal portion and a distal portion, the inner member positioned coaxially within the outer member, the inner member and outer member relatively movable to effect deflection of a tip of the catheter;
a first stop movable with the inner member;
a second stop movable with the inner member;
a third stop movable with the outer member;
an elongated column member attached to the inner member externally thereof and radially offset from a longitudinal axis of the inner member;
wherein upon one or both of axial proximal movement of the inner member and distal movement of the outer member engagement of the first stop enables deflection of the tip in a first direction, and upon one or both of axial distal movement of the inner member and proximal movement of the outer member the second stop engages the outer catheter to enable deflection of the tip in a second direction different than the first direction, the second stop spaced axially from the first stop.
12. The deflectable catheter of claim 11 , wherein the first stop is at a proximal portion of the coil.
13. The deflectable catheter of claim 12 , wherein the second stop is positioned proximal of the first stop.
14. A deflectable catheter comprising:
an outer member having a proximal portion and a distal portion;
an inner member having a proximal and a distal portion, the inner member positioned coaxial within the outer member, the inner member and outer member relatively movable to cause deflection of a tip of the catheter, wherein the inner member is rotatable with respect to the outer member;
an elongated column member, the column member turning with the inner member;
a first stop at a distal portion of the catheter configured to limit either one or both of axial movement of the inner member in a first axial direction and movement of the outer member in a second axial direction opposite the first axial direction, wherein after contact with the first stop further relative movement of the inner member and outer member causes deflection of the tip in a first direction.
15. The deflectable catheter of claim 14 , wherein the column member extends distally of the outer member.
16. The deflectable catheter of claim 15 , further comprising a reinforcement member positioned over the column member to restrict axial movement of the column member such that when one of the inner member or outer member is moved with respect to the other, axial compression of the column member is restricted by the reinforcement member causing a tip portion of the inner member to deflect laterally.
17. The deflectable catheter of claim 15 , further comprising a second stop configured to limit either one or both of axial movement of the inner member in the second direction and axial movement of the outer member in the first axial direction wherein after contact with the second stop further relative movement of the inner member and outer member causes deflection of the tip of the catheter in a second direction different than the first direction, the second stop spaced axially from the first stop.
18. The deflectable catheter of claim 15 , wherein the column member is connected to the inner member and not connected to the outer member.