Implantable lead with coplanar contact coupling
A connection made between a contact and a conductor in an implantable lead assembly includes a slot, formed in the contact, and a crimp sleeve, attached to the contact; wherein the crimp sleeve includes a contact coupling, which rests within the contact slot, and a conductor coupling, crimped around the conductor, within a body of the lead assembly. The conductor coupling of the crimp sleeve may be pushed through the contact slot, anywhere along a length of the slot, so that the contact coupling comes to rest between opposing edges of the slot. A preferred profile of the contact coupling of the crimp sleeve is such that the contact coupling rests within the contact slot, without falling through to the inside diameter of the contact, prior to attachment thereto.
1. An implantable lead assembly comprising a lead body, a conductor contained within the lead body, a contact having an inside diameter and an outside surface defining an outer diameter of the contact, and a connection between the contact and the conductor, the connection comprising:
a slot formed in the contact, the slot having a length extending parallel a longitudinal axis of the contact and a width transverse to the length, the width having a first dimension at the outer diameter of the contact and a second, smaller dimension at the inside diameter of the contact;
a crimp sleeve comprising a conductor coupling and a contact coupling, the conductor coupling being crimped around the conductor within the lead body, the contact coupling having an outside surface located radially outward from the conductor coupling, and the contact coupling being attached to the contact and resting within the contact slot so that the outside surface of the contact coupling is approximately flush with the outside surface of the contact;
wherein a width of the contact coupling of the crimp sleeve, at the outside surface thereof, fits within the slot at the outer diameter of the contact, but is greater than the width of the slot at the inside diameter, so that the contact coupling rests within the contact slot, without falling through to the inside diameter of the contact, prior to attachment thereto.
2. The assembly of claim 1 , wherein the crimp sleeve has a length that is less than the length of the slot formed in the contact, the length of the crimp sleeve extending parallel to the longitudinal axis of the contact.
3. The assembly of claim 1 , wherein the first dimension of the width of the slot formed in the contact is approximately 0.036 cm and the second, smaller dimension of the width is approximately 0.023 cm.
4. The assembly of claim 1 , wherein the contact coupling of the crimp sleeve is attached to the contact by a weld between the outside surface of the contact coupling and the outside surface of the contact.
5. The assembly of claim 1 , wherein the length of the slot formed in the contact is equal to an overall length of the contact.
6. The assembly of claim 1 , wherein the conductor coupling of the crimp sleeve comprises two side arms.