Expanding coil coupling for lead extension and extraction

1. A lead locking device, comprising:

a body;

a tubular member coupled to the body, the tubular member comprising an outer surface, wherein the outer surface is sized to insert into an inner lumen of a lead, the tubular member is movable between a first configuration in which the tubular member slides into the lead, and a second configuration in which at least a portion of the tubular member expands to engage an inner surface of the lead, wherein the tubular member comprises a plurality of segments, wherein at least some segments of the plurality of segments springably release in either a proximal-to-distal direction or a distal to proximal direction; and

an actuation mechanism operatively coupled to the tubular member, the actuation mechanism configured to move the tubular member between the first configuration and second configuration.

2. The device of claim 1 , wherein the at least some segments of the plurality of segments springably release to sequentially engage the inner surface of the lead from a distal-most end of the lead to a proximal-most end of the lead.

3. The device of claim 1 , wherein the at least some segments of the plurality of segments springably release to sequentially engage the inner surface of the lead from a proximal-most end of the lead to a distal-most end of the lead.

4. The device of claim 1 further comprising a tether coupled to the lead via one or more of the body, the tubular member, and the actuation mechanism, the tether configured to extend further proximally than the proximal-most end of the lead, the tether further configured to transfer at least a portion of a tension force applied to the tether to the lead via the one or more of the body, the tubular member, and the actuation mechanism.

5. The device of claim 1 , wherein the plurality of segments include segments of different pitch, such that some of the plurality of segments are configured to expand to springably engage the lead at a lower applied torque than others of the plurality of segments.

6. A lead locking device, comprising:

a body;

a tubular member coupled to the body, the tubular member comprising an outer surface, wherein the outer surface is sized to insert into an inner lumen of a lead, the tubular member is movable between a first configuration in which the tubular member slides into the lead, and a second configuration in which at least a portion of the tubular member expands to engage an inner surface of the lead; and

an actuation mechanism operatively coupled to the tubular member, the actuation mechanism configured to move the tubular member between the first configuration and second configuration, wherein the actuation mechanism comprises a first ratchet grip and a second ratchet grip, wherein the first ratchet grip is coupled to a first end of the tubular member, wherein the second ratchet grip is coupled to a second end of the tubular member, and wherein the actuation mechanism is configured to move the tubular member between the first and second configurations via one or both of:

rotation of the first ratchet grip along a first rotational direction relative to the second ratchet grip, and

rotation of the second ratchet grip along a second rotational direction relative to the first ratchet grip, wherein the first and second rotational directions are opposing rotational directions.

7. The device of claim 6 , wherein the first ratchet grip engages the second ratchet grip at a unidirectional rotational coupling that permits rotation of the first ratchet grip along the first rotational direction relative to the second ratchet grip and rotation of the second ratchet grip along the second rotational direction relative to the first ratchet grip while inhibiting rotation of the first ratchet grip along the second rotational direction relative to the second ratchet grip and of the second ratchet grip along the first rotational direction relative to the first ratchet grip while the first ratchet grip is in the unidirectional rotational coupling with the second ratchet grip.

8. The device of claim 7 , wherein the unidirectional rotational coupling includes one or more undercut or back-cut teeth formed on one or both of the first and second ratchet grips.

9. The device of claim 7 , wherein the first and second ratchet grips are axially separable from one another to release the unidirectional rotational coupling, thereby permitting the tubular member to move from the second configuration to the first configuration.

10. The device of claim 7 , further comprising an inner sleeve, a keyway formed in one of the inner sleeve and the first ratchet grip, and a tab formed in the other of the inner sleeve and the first ratchet grip, wherein torque is transmitted from the inner sleeve to the first ratchet grip via an interface between the keyway and the tab, the tab configured to break away from the inner sleeve at a level of applied torque.

11. The device of claim 6 , wherein the actuation mechanism is the body.

12. A lead locking device, comprising:

a body;

a tubular member coupled to the body, the tubular member comprising an outer surface, wherein the outer surface is sized to insert into an inner lumen of a lead, the tubular member is movable between a first configuration in which the tubular member slides into the lead, and a second configuration in which at least a portion of the tubular member expands to engage an inner surface of the lead; and

an actuation mechanism operatively coupled to the tubular member, the actuation mechanism configured to move the tubular member between the first configuration and second configuration, wherein the body comprises a first sleeve and a second sleeve, wherein the first sleeve is coupled to a first end of the tubular member, wherein the second sleeve is coupled to a second end of the tubular member, and wherein the actuation mechanism is configured to move the tubular member between the first and second configurations via axial translation of the first sleeve along a direction relative to the second sleeve.

13. The device of claim 12 , wherein the actuation mechanism further comprises a pin coupled to one of the first and second sleeves and a slot formed in another of the first and second sleeves, wherein the slot guides a path of translation of the first sleeve with respect to the second sleeve.

14. The device of claim 13 , wherein the slot includes a portion that imparts a tightening twist to the tubular member in moving the tubular member to the second configuration.

15. The device of claim 13 , wherein the direction is a first direction, and wherein the slot includes a portion that causes translation of the first sleeve along a second direction relative to the second sleeve in moving the tubular member to the second configuration, wherein the second direction is different from the first direction.

16. The device of claim 15 , wherein the second direction is opposite to the first direction.