Connector assemblies for implantable stimulators

1. A system comprising:

an implantable microstimulator comprising

a single body having a distal end surface, a proximal end surface, and at least one side surface disposed in between the distal and proximal end surfaces,

electrical circuitry disposed within the single body and configured and arranged to generate electrical stimulation current,

a power source disposed within the single body and coupled to the electrical circuitry to provide power used for electrical stimulation, and

a programmable memory unit disposed within the single body and coupled to the electrical circuitry and the power source; and

a connector assembly attached to the microstimulator and extending parallel to the at least one side surface of the micro stimulator;

wherein the connector assembly is further configured to removably receive a portion of a lead and to electrically couple one or more electrodes disposed on the lead to the electrical circuitry of the micro stimulator.

2. The system of claim 1 , wherein the microstimulator comprises a cylindrical housing defining the body of the microstimulator.

3. The system of claim 1 , wherein the microstimulator further comprises at least one electrode disposed on the at least one side surface.

4. The system of claim 1 , wherein the connector assembly comprises a lumen open at at least one end and extending parallel to the at least one side surface of the microstimulator to receive the portion of the lead; and one or more electrical contacts in communication with the lumen and configured to electrically couple to one or more corresponding electrical contacts disposed on the lead.

5. The system of claim 4 , wherein the electrical contacts in communication with the lumen comprise ring contacts.

6. The system of claim 1 , further comprising an encasing configured to at least partially surround the microstimulator and the connector assembly.

7. The system of claim 1 , further comprising one or more conductive wires configured to electrically couple electrical circuitry disposed within the microstimulator to the connector assembly.

8. The system of claim 7 , further comprising a separate boot member extending from the microstimulator to the connector assembly and at least partially surrounding a portion of the conductive wires.

9. The system of claim 7 , wherein a least a portion of the plurality of conductive wires is in a form of a ribbon cable extending from the microstimulator to the connector assembly.

10. The system of claim 1 , further comprising a lead having a distal portion, a proximal portion, a plurality of lead electrodes disposed along the distal portion, and a plurality of electrical contacts disposed along the proximal portion and electrically coupled to the plurality of lead electrodes, wherein the connector assembly is configured to removably receive the proximal portion of the lead to facilitate electrical coupling of the lead to the stimulator through the electrical contacts of the lead and to provide electrical stimulation from the microstimulator to one or more stimulation sites within the patient via the lead and the lead electrodes.

11. The system of claim 1 , further comprising:

another micro stimulator configured to be implanted within a patient, the another micro stimulator comprising

a single body defined by at least one side surface disposed in between distal and proximal end surfaces,

electrical circuitry disposed within the single body and configured and arranged to generate electrical stimulation current,

a power source disposed within the single body and coupled to the electrical circuitry to provide power used for electrical stimulation, and

a programmable memory unit disposed within the single body and coupled to the electrical circuitry and the power source;

another connector assembly attached to the another micro stimulator and extending parallel to the at least one side surface of the another micro stimulator; and

an encasing configured to at least partially surround both of the microstimulators and both of the connector assemblies.

12. The system of claim 1 , further comprising:

a plurality of other microstimulators configured to be implanted within a patient, each of the other microstimulators comprising

a single body defined by at least one side surface disposed in between distal and proximal end surface,

electrical circuitry disposed within the single body and configured and arranged to generate electrical stimulation current,

a power source disposed within the single body and coupled to the electrical circuitry to provide power used for electrical stimulation, and

a programmable memory unit disposed within the single body and coupled to the electrical circuitry and the power sources;

a plurality of other connector assemblies each attached to a respective one of the plurality of other micro stimulators and extending parallel to the at least one side surface of the respective one of the other micro stimulators; and

a single encasing configured to at least partially surround and hold together all of the micro stimulators and all of the connector assemblies.

13. A method of stimulating patient tissue, the method comprising:

implanting the system of claim 1 ;

removably coupling a lead having one or more electrodes disposed thereon to the connector assembly of the system;

generating electrical stimulation with the microstimulator of the system; and

applying the electrical stimulation to one or more stimulation sites within a patient via the one or more electrodes of the lead.

14. A stimulation assembly comprising:

an implantable microstimulator comprising a body having a distal end surface, a proximal end surface, and at least one side surface disposed in between the distal and proximal end surfaces; and

a connector assembly configured to be coupled to the microstimulator and extend parallel to the at least one side surface of the micro stimulator, wherein the connector assembly is further configured to removably receive a portion of a lead and to electrical couple one or more electrodes disposed on the lead to the microstimulator; and

a silicone encasing configured to at least partially surround and hold together the microstimulator and the connector assembly.

15. The stimulation assembly of claim 14 , wherein the microstimulator further comprises at least one electrode disposed on the at least one side surface.

16. The stimulation assembly of claim 14 , wherein the connector assembly comprises a lumen open at at least one end and extending parallel to the at least one side surface of the microstimulator to receive the portion of the lead; and one or more electrical contacts in communication with the lumen and configured to electrically couple to one or more corresponding electrical contacts disposed on the lead.

17. The stimulation assembly of claim 14 , further comprising one or more flexible conductive wires configured to electrically couple electrical circuitry disposed within the microstimulator to the connector assembly.

18. The stimulation assembly of claim 17 , further comprising a separate boot member extending from the microstimulator to the connector assembly and at least partially surrounding a portion of the conductive wires.

19. The stimulation assembly of claim 17 , wherein a least a portion of the plurality of conductive wires is in a form of a ribbon cable extending from the microstimulator to the connector assembly.

20. A method of stimulating patient tissue, the method comprising:

implanting the stimulation assembly of claim 14 ;

removably coupling a lead having one or more electrodes disposed thereon to the connector assembly of the stimulation assembly;

generating electrical stimulation with the microstimulator stimulation assembly; and

applying the electrical stimulation to one or more stimulation sites within a patient via the one or more electrodes of the lead.