Implantable medical devices including elongated conductor bodies that facilitate device and lead configuration variants
Implantable medical devices include elongated conductor bodies and related features including an attachment to the medical device at one end and a connector that receives a medical lead at the other end. The connector may have various features such as a modular design whereby the connector is constructed from a series of stacked contact modules. Other features of the connector include electrical contacts that are relatively thin conductors or the order of 0.040 inches or less and that may include radial protrusions to establish contact with the electrical connectors of the lead. Furthermore, electrical contacts may be mounted within the connector in a floating manner so that radial movement of the electrical contact may occur during lead insertion. Additional features include a feedthrough where conductors exposed beyond a housing of the implantable medical device make direct electrical connection to conductors present within the elongated body.
1. A method of constructing an implantable medical device, comprising:
providing a housing;
providing circuitry within the housing;
providing a feedthrough electrically connected to the circuitry and providing at least one feedthrough conductor externally of the housing;
mounting a harness to the housing, the harness comprising:
an elongated body having a proximal end and a distal end;
at least one conductor in the body, the at least one conductor being electrically coupled to the at least one feedthrough conductor in proximity to the proximal end of the body;
a connector attached to the distal end of the body, the connector defining at least one lead passageway and comprising at least one electrical contact that is electrically coupled to the at least one feedthrough conductor, the at least one electrical contact surrounding the lead passageway and having a thickness in an axial direction of 0.040 inches or less.
2. The method of claim 1 , wherein the at least one electrical contact floats radially relative to the at least one lead passageway.
3. The method of claim 1 , wherein the connector further comprises:
a plurality of adjacent contact modules, each contact module having at least one lead passageway;
a plurality of contact isolators, with a contact isolator of the plurality being disposed within each of the at least one lead passageways of the corresponding contact modules of the plurality; and
wherein the plurality of electrical contacts are positioned within the at least one lead passageway, with at least one electrical contact being located axially between contact isolators.
4. The method of claim 3 , wherein each contact module has axial extensions spaced circumferentially on a first end, the plurality of contact modules being stacked so that an axial extension of one contact module fits into the lead passageway of an adjacent contact module,
wherein each contact isolator of the plurality is present between an abutment within the at least one lead passageway of the corresponding contact module and an end of the axial extensions of an adjacent contact module that are present within the at least one lead passageway of the corresponding contact module, and
wherein each electrical contact of the plurality is disposed about the axial extensions of the plurality of contact modules.
5. The method of claim 3 , wherein each of the electrical contacts includes an extension that is present within a channel of the contact modules, extends along the channel of the plurality of contact modules toward the body, and is electrically connected to one of the electrical conductors of the body.
6. The method of claim 5 , wherein the connector is encapsulated in a polymer.
7. The method of claim 3 , wherein the plurality of adjacent contact modules are fused.
8. The method of claim 3 , wherein each contact isolator is a ring.
9. The method of claim 3 , wherein each contact isolator is made of silicone rubber.
10. The method of claim 1 , wherein each of the electrical contacts comprises flexible radial protrusions.