Rotatable lead introducer
View Patent ↗Minimally invasive introducers and methods that can be used for rotationally securing devices within the human body. Introducers can include a distal element for releasably engaging a lead head controllable from a proximal control located outside of the body. An inner stem can extend between a proximal portion and a distal portion, and be pivotally and rotatably coupled to the distal lead engagement mechanism. An outer tube can be rotatably disposed over the inner stem and be flexibly coupled over the pivot to rotationally drive the distal element. A helical epicardial-myocardial lead electrode can be secured and oriented straight ahead and introduced through a port or small incision with the introducer in a straight configuration. The introducer can then be bent and rotated to screw the helical electrode into the heart.
1. A device for rotating and inserting an electrode of a lead into body tissue to be stimulated, the device comprising:
a) an elongate shaft having a proximal portion and a distal portion;
b) a first distal member pivotally coupled to the elongate shaft distal portion;
c) a second distal member rotatably coupled to the first distal member;
d) wherein the second distal member includes a portion for releasably engaging the electrode;
e) a rotatable tube having a proximal portion and a distal portion, the tube disposed around the elongate shaft and rotatably flexibly coupled over the first distal member pivotal coupling to the second distal member;
g) a first elongate member having a distal region operably coupled to the second distal member portion for releasably engaging the electrode and having a proximal portion actuable from the device proximal portion to release the electrode; and
h) a second elongate member having a distal region operably coupled to the first or second distal member for causing the first distal member to pivot relative to the elongate shaft, and having a proximal portion actuable from the device proximal portion.
2. The device as in claim 1 , wherein the elongate shaft is a tube having the first and second elongate members disposed within.
3. The device as in claim 2 , wherein the first and second elongate members are slidably disposed within the elongate shaft.
4. The device as in claim 1 , wherein the second elongate member operable coupling to the first or second distal member forms a lever arm with respect to the pivotal coupling of the elongate shaft to the first distal member.
5. The device as in claim 4 , wherein the second elongate member actuates in both compression and in tension.
6. The device as in claim 1 , in which the release engagement portion is reversibly transversely moveable relative to a central longitudinal axis of the engagement portion, wherein the first elongate member operable coupling is coupled to urge the releasable engagement portion transversely outward to release the lead head.
7. The device as in claim 6 , in which the second distal member includes a collet having jaws, in which the first elongate member is operably coupled to an element for urging the jaws apart when the first elongate member is proximally retracted.
8. The device as in claim 7 , wherein the first elongate member operably coupling releases a camming force on the jaws, allowing the jaws to open when the first elongate member is proximally retracted.
9. The device as in claim 1 , wherein the first elongate member acts only in tension.
10. The device as in claim 1 , wherein the second elongate member is operably coupled to the second distal member.
11. The device as in claim 1 , further comprising a manually operable rotatable portion coupled to the tube, wherein the manually rotatable portion has a larger radius then the tube and is coupled to effect rotation of the tube.
12. The device as in claim 1 , wherein the first elongate member proximal portion is actuatable through a slider element.
13. The device as in claim 1 , further comprising at least one guide along an external surface of the tube to secure a lead body to the tube.
14. The device as in claim 13 , in which the guide allows for axial movement of the lead body within the guide.
15. The device as in claim 1 , in which the first distal member is a distal portion of a hinge and in which the second distal member includes a collet rotatably disposed about the hinge distal portion.
16. The device as in claim 1 , in which the second distal member includes a collet and in which the collet includes jaws that can be urged apart through a camming action actuated from the device proximal portion using the first elongate member.
17. The device as in claim 16 , in which the collet includes a plurality of inwardly protruding teeth.
18. A device for rotating and inserting an electrode of a lead into body tissue to be stimulated, the device comprising:
a) an elongate shaft having a proximal portion and a distal portion;
b) a hinge having a proximal portion coupled to the elongate shaft distal portion, and a distal portion;
c) a lead grasping member rotatably coupled to the hinge distal portion;
d) wherein the lead grasping member includes jaws configured and dimensioned to releasably grasp the lead, and an internal camming surface coupled to the jaws;
e) a camming element disposed within the lead grasping member and biased to apply force to the camming surface to open the jaws;
f) a first elongate member having a distal region coupled to the camming element to reduce the bias when the first elongate member is proximally retracted, and a proximal portion actuatable from the device proximal portion;
g) a second elongate element having a distal region operably coupled to the hinge distal portion and a proximal region actuatable from the device proximal portion; and
h) a tube rotatably disposed over the elongate shaft and rotatably coupled to the lead grasping member over the hinge.
19. The device of claim 18 , in which the lead grasping member includes a collet having teeth disposed to be located about the electrode and having an inter-tooth spacing of no greater than about 100 degrees.
20. The device of claim 18 , having at least one guide for holding the lead along the rotatable tube while the tube is rotating.