Patent Issued for External Charging Device for Charging an Implantable Medical Device and Methods of Regulating Duty Cycle of an External Charging Device
The patent's inventor is Winstrom, William L (
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "Neurostimulation systems are devices that generate electrical pulses and deliver the pulses to nerve tissue to treat a variety of disorders. Spinal cord stimulation (SCS) is an example of neurostimulation in which electrical pulses are delivered to nerve tissue in the spine for the purpose of chronic pain control. Other examples include deep brain stimulation, cortical stimulation, cochlear nerve stimulation, peripheral nerve stimulation, vagal nerve stimulation, sacral nerve stimulation, etc. While a precise understanding of the interaction between the applied electrical energy and the nervous tissue is not fully appreciated, it is known that application of an electrical field to spinal nervous tissue can effectively mask certain types of pain transmitted from regions of the body associated with the stimulated nerve tissue. Specifically, applying electrical energy to the spinal cord associated with regions of the body afflicted with chronic pain can induce 'paresthesia' (a subjective sensation of numbness or tingling) in the afflicted bodily regions. Thereby, paresthesia can effectively mask the transmission of non-acute pain sensations to the brain.
"Neurostimulation systems generally include a pulse generator and one or more leads. The pulse generator is typically implemented using a metallic housing that encloses circuitry for generating the electrical pulses, control circuitry, communication circuitry, a rechargeable battery, recharging circuitry, etc. The pulse generation circuitry is coupled to one or more stimulation leads through electrical connections provided in a 'header' of the pulse generator. Stimulation leads typically include multiple wire conductors enclosed or embedded within a lead body of insulative material. Terminals and electrodes are located on the proximal and distal ends of the leads. The conductors of the leads electrically couple the terminals to the electrodes. The electrical pulses from the pulse generator are conducted through the leads and applied to patient tissue by the electrodes of the leads.
"Recharging of an implanted pulse generator typically occurs by near-field coupling of a coil in the implanted pulse generator with a coil of an external charging device (which could also function as a programming device). The external charging device radiates power from its coil which induces current in the coil of the implanted pulse generator. The recharging circuitry of the implanted pulse generator rectifies the induced current and charges the battery of the implanted pulse generator (subject to various regulation circuitry)."
Supplementing the background information on this patent, NewsRx reporters also obtained the inventor's summary information for this patent: "In one embodiment, an external charging device for recharging an implanted medical device, comprises: a battery for powering the external charging device; a coil for radiating RF power; drive circuitry for driving the coil according to a duty cycle; circuitry for generating a signal that is indicative of an amount of current flowing through the coil; and control circuitry for controlling the drive circuitry, wherein the control circuitry is operable to process the signal from the circuitry for generating to detect when a coil of the implantable medical device temporarily ceases absorbing RF power, the control circuitry modifying the duty cycle in response to detection of the coil of the implantable medical device temporarily ceasing absorbing RF power.
"The foregoing has outlined rather broadly certain features and/or technical advantages in order that the detailed description that follows may be better understood. Additional features and/or advantages will be described hereinafter which form the subject of the claims. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the appended claims. The novel features, both as to organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the appended claims."
For the URL and additional information on this patent, see: Winstrom,
Keywords for this news article include: Pain, Nervous System Diseases, Neurologic Manifestations,
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