Amelioration of chronic pain by endolymphatic stimulation
A device and method are disclosed for treating chronic pain by delivering electrical stimulation to nervous tissue or smooth muscle fibers by means of electrodes disposed in the body's lymphatic system. An implanted pulse generator is connected to an electrode by a lead that may be intravenously introduced into the lymphatic system. The stimulation may be patient-controlled or be delivered in accordance with a programmed schedule.
1. A method for treating pain, comprising:
implanting a pulse generator having a lead attached thereto;
implanting the lead into a patient's lymphatic system by introducing the lead intravenously into a thoracic duct and thence to a selected location within a lymphatic vessel;
disposing an electrode incorporated into the lead at a selected location within the lymphatic vessel so as to be near selected nervous tissue responsible for a patient's chronic pain; and,
delivering electrical stimulation from the pulse generator to the electrode incorporated into the lead in a manner that reduces the patient's pain.
2. The method of claim 1 wherein the electrical stimulation is delivered in a form selected from a group including a DC pulse, a biphasic pulse, a multi-phasic pulse, and a pulse train at a selected frequency for a selected duration.
3. The method of claim 1 further comprising initiating delivery of the electrical stimulation by actuating a manually operated switch incorporated into the pulse generator.
4. The method of claim 3 wherein the switch is a tactilely actuated switch.
5. The method of claim 3 wherein the switch is a magnetically actuated switch.
6. The method of claim 1 further comprising initiating delivery of the electrical stimulation by transmitting a command to a telemetry transceiver incorporated into the pulse generator.
7. The method of claim 1 further comprising programming a controller incorporated into the pulse generator to deliver the electrical stimulation in accordance with a defined schedule.
8. The method of claim 1 further comprising delivering the electrical stimulation with a unipolar lead such that a voltage generated by the pulse generator is imposed between the electrode of a unipolar lead and a conductive housing of pulse generator.
9. The method of claim 1 further comprising delivering electrical stimulation with a bipolar lead such that a voltage generated by the pulse generator is imposed between two electrodes of the bipolar lead.
10. A method for treating pain due to edema, comprising:
implanting a pulse generator having a lead attached thereto;
implanting the lead into a patient's lymphatic system by introducing the lead intravenously into a thoracic duct and thence to a selected location within a lymphatic vessel;
disposing an electrode incorporated into the lead at a selected location within the lymphatic vessel so as to be near selected areas of edema; and,
delivering electrical stimulation from the pulse generator to the electrode incorporated into the lead to elicit smooth muscle fiber activation and lymphatic vessel contraction in a manner that reduces the edema.