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UHF Antenna For Implantable Medical Device

IP.com Disclosure Number: IPCOM000009889D
Publication Date: 2002-Sep-25
Document File: 5 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

A UHF antenna for an implantable medical device comprises a conductor which may be adjusted to resonate at the frequency allocated to implantable medical devices, and the metal case of the device as a counterpoise. A connected end of the conductor is electrically connected to the case and the conductor circles partially around the case from the connected end to an open end. The open end may be adjusted to tune the center frequency of the antenna. A radial feed-point between the connected end and the open end may also be adjusted to tune the center frequency of the antenna. The conductor may have a round or flat cross-section. An insulating material separates the conductor from the case and holds the conductor in place.

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UHF Antenna For Implantable Medical Device

A UHF antenna for an implantable medical device comprises a conductor which may be adjusted to resonate at the frequency allocated to implantable medical devices, and the metal case of the device as a counterpoise.  A connected end of the conductor is electrically connected to the case and the conductor circles partially around the case from the connected end to an open end.  The open end may be adjusted to tune the center frequency of the antenna.  A radial feed-point between the connected end and the open end may also be adjusted to tune the center frequency of the antenna.  The conductor may have a round or flat cross-section.  An insulating material separates the conductor from the case and holds the conductor in place.

UHF Antenna For Implantable Medical Device

Background

Spinal cord stimulation is a well accepted clinical method for reducing pain in certain populations of patients.  SCS systems typically include an Implantable Pulse Generator (IPG), electrodes, electrode lead, and electrode lead extension.  The IPG  generates electrical pulses that are delivered to the dorsal column fibers within the spinal cord through the electrodes. The electrodes are implanted along the dura of the spinal cord.  Individual electrode contacts (the “electrodes”) may be arranged in a desired pattern and spacing in order to create an electrode array. Individual wires, or electrode leads, connect with each electrode in the array. The electrode leads exit the spinal cord and attach to one or more electrode lead extensions.  The electrode lead extension, in turn, is typically tunneled around the torso of the patient to a subcutaneous pocket where the IPG is implanted. 

SCS and other stimulation systems are known in the art.  For example, a known implantable electronic stimulator provides timed sequenced electrical impulses to a plurality of electrodes.  Another known electrode implant for neuro-stimulation of the spinal cord includes a relatively thin and flexible strip of biocompatible material provided as a carrier on which a plurality of electrodes are formed.  The electrodes are connected by a conductor, e.g., a lead body, to an Radio Frequency (RF) receiver, which is also implanted, and which is controlled by an external controller.

Yet another type of electrical spinal cord stimulation device has five aligned electrodes which are positioned longitudinally on the spinal cord.  Current pulses applied to the electrodes block sensed intractable pain, while allowing passage of other sensations. The stimulation pulses applied to the electrodes have a repetition rate of from 5 to 200 pulses per second. A patient operated switch allows the patient to change which electrodes are activated, i.e., which electrodes receive the stimulation pulses, so that the area between the activated electrodes on the spinal cord can be adjusted, as required, to better block the pain.

An RF link is generally used to provide control...