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System and Method for Lead Fixation

IP.com Disclosure Number: IPCOM000019571D
Publication Date: 2003-Sep-19

Publishing Venue

The IP.com Prior Art Database

Related People

Sarvani Grandhe: INVENTOR [+2]

Abstract

A medical lead design includes a pitted, grooved, or threaded electrode array tip and a flexible tube or sheath encompassing the electrode array just adjacent the tip. In some embodiments, the electrode array tip adheres to tissue, the tube or sheath adheres to the electrode array at the distal end of the electrode array, and the tube or sheath adheres to tissue at the proximal end of the tube or sheath. Embodiments of the tube or sheath are made from biodegradable material and include electrode windows spaced along the tube or sheath adjacent electrode contacts of the electrode array.

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System and Method for Lead Fixation

Background & Summary

This system and method for lead fixation relates to medical stimulation systems, e.g., a spinal cord stimulation system. More particularly, the system and method for lead fixation relates to medical stimulation leads that include lead fixation means, i.e., ways to assure that the lead, once implanted, does not move away from its desired implant location.

Spinal cord stimulation (SCS) is a well accepted clinical method for reducing pain in certain populations of patients. SCS systems typically include an implanted pulse generator, lead wires, and electrodes connected to the lead wires. The pulse generator generates electrical pulses that are delivered to the dorsal column fibers within the spinal cord through the electrodes which are implanted along the dura of the spinal cord. In a typical situation, the attached lead wires exit the spinal cord and are tunneled around the torso of the patient to a sub-cutaneous pocket where the pulse generator is implanted.
When an electrical pulse, or sequence of pulses, is applied to a selected electrode, or combination of electrodes, the patient typically experiences a "paresthesia" (usually manifest as a mild tingling sensation) that is therapeutic, i.e., that relieves the pain, or other discomfort, the patient is experiencing, or that otherwise aids the patient in some useful way.

Spinal cord and other stimulation systems are known in the art. For example, in United States Patent No. 3,646,940, there is disclosed an implantable electronic stimulator that provides timed sequenced electrical impulses to a plurality of electrodes so that only one electrode has a voltage applied to it at any given time. Thus, the electrical stimuli provided by the apparatus taught in the ‘940 patent comprise sequential, or non-overlapping, stimuli.
In United States Patent No. 3,724,467, an electrode implant is disclosed for the neuro-stimulation of the spinal cord. A relatively thin and flexible strip of physiologically inert plastic is provided with a plurality of electrodes formed thereon. The electrodes are connected by leads to an RF receiver, which is also implanted, and which is controlled by an external controller. The implanted RF receiver has no power storage means, and must be coupled to the external controller in order for neuro-stimulation to occur.
In United States Patent No. 3,822,708, another type of electrical spinal cord stimulating device is shown. The device has five aligned electrodes which are positioned longitudinally on the spinal cord and transversely to the nerves entering the spinal cord. Current pulses applied to the electrodes are said to block sensed intractable pain, while allowing passage of other sensations. The stimulation pulses applied to the electrodes are approximately 250 microseconds in width with a repetition rate of from 5 to 200 pulses per second. A patient-operable switch allows the patient to change which electrodes are act...