Power generation for implantable devices
First Claim
1. A wirelessly powered medical device comprising:
- a wireless energy harvesting module configured to receive at least one type of wireless power;
a power management module configured to manage and monitor power harvested by the wireless energy harvesting module;
a sensing module configured to provide sensing data; and
a control module configured to communicate with the power management module and with the sensing module;
wherein the power management module and the control module are configured to communicate with each other to modify an interrelation of operations of the wireless energy harvesting module and the sensing module, including to compensate for influences of wireless power harvesting on operation of the sensing module.
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Accused Products

Abstract
This application includes systems and techniques relating to wirelessly rechargeable medical apparatus, such as a wirelessly powered medical device including: a wireless energy harvesting module configured to receive at least one type of wireless power; a power management module configured to manage and monitor power harvested by the wireless energy harvesting module; a sensing or stimulation module configured to provide sensing data or a treatment operation; and a control module configured to communicate with the power management module and with the sensing or stimulation module; wherein the power management module and the control module are configured to communicate with each other to modify an interrelation of operations of the wireless energy harvesting module and the sensing or stimulation module, including to compensate for influences of wireless power harvesting on operation of the sensing module or on the treatment operation provided by the stimulation module.
690 Citations
No References
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22 Claims
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1. A wirelessly powered medical device comprising:
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a wireless energy harvesting module configured to receive at least one type of wireless power; a power management module configured to manage and monitor power harvested by the wireless energy harvesting module; a sensing module configured to provide sensing data; and a control module configured to communicate with the power management module and with the sensing module; wherein the power management module and the control module are configured to communicate with each other to modify an interrelation of operations of the wireless energy harvesting module and the sensing module, including to compensate for influences of wireless power harvesting on operation of the sensing module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wirelessly powered medical device comprising:
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a wireless energy harvesting module configured to receive at least one type of wireless power; a power management module configured to manage and monitor power harvested by the wireless energy harvesting module; a stimulation module configured to provide a treatment operation; and a control module configured to communicate with the power management module and with the stimulation module; wherein the power management module and the control module are configured to communicate with each other to modify an interrelation of operations of the wireless energy harvesting module and the stimulation module, including to compensate for influences of wireless power harvesting on the treatment operation provided by the stimulation module. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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1 Specification
This application is a continuation of U.S. patent application Ser. No. 15/220,655, filed on Jul. 27, 2016, which is a continuation of U.S. patent application Ser. No. 14/454,349, filed on Aug. 7, 2014, now U.S. Pat. No. 9,421,388, which is a continuation-in-part of U.S. patent application Ser. No. 12/131,910, filed on Jun. 2, 2008, now U.S. Pat. No. 8,805,530, which claims priority to U.S. provisional application 60/977,086, filed on Oct. 2, 2007, entitled “Systems and Methods for Wireless Power”, 60/941,286, filed on Jun. 1, 2007, entitled “Systems and Methods for Wireless Power”, 60/941,287, filed on Jun. 1, 2007, entitled “Power generation for implantable devices”, all of which are incorporated herein by reference in their entirety.
The invention relates to providing energy to implantable devices and using wireless energy which has been transmitted and energy derived from natural resources which are available in the patient'"'"'s environment with an emphasis on utilization of RF energy, heat, light, and motion.
Implantable medical devices use electrical power to operate and provide therapies which can include monitoring and stimulation. When therapy is provided or adjusted programmably, using an external patient controller, communication between the external and internal components of the medical system also requires power. An implantable device can monitor the heart and alert the patient when an abnormal cardiac state occurs so that they may seek intervention such as is described in U.S. Pat. No. 6,609,023 and US20070016089, both to Fischell et al. The implantable device may also use this monitoring in delivering responsive therapy such as pacing the heart, delivering a drug, or stimulating nerve tissue of the brain or body as described in U.S. Pat. No. 6,066,163, to John.
An implantable medical device can be a neurostimulation device which performs sensing and/or modulation of neural activity in the treatment of, for example, epilepsy, motor, pain, psychiatric, mood, degenerative, and aged-related disorders. Neurostimulators can be located in the brain, in the skull, or in the body. This last embodiment will require that electrode leads transverse the neck so that they can stimulate their intended neural targets within the brain. Vagal and cranial nerve stimulators may also be used for therapies related to modulation of the brain or body (as may occur directly or by way of an intervening neural target). Implantable medical devices may be placed throughout the body to modulate the activity of different organs and biological processes, and include devices used in the provision of therapy for eating disorders, pain, migraine, and metabolic disorders such as diabetes. As the duration of sensing, processing, monitoring, and stimulation increases the amount of power needed will also increase.
The reliability and longevity of a power source is major issue in operating implantable medical devices. Numerous advances have addressed power requirements including improvements in materials, (re-)charging methods, and technologies. Incorporation of dual battery paradigms has also provided benefits since the two batteries can differ in characteristics of energy storage, chemistry and power output capacities, in order to, for example, reach a compromise between high-energy output and sustainability. Implantable devices themselves have also been improved with features such as “sleep” and “low power” modes, where less energy is needed. Regardless of these improvements, all device operations require power, including monitoring, processing of monitored data, stimulation, and communication with external devices.
A top reason for surgical removal of neurostimulators and other types of implanted devices is longevity of the power source. The need for surgical removal of an entire implanted device traditionally occurs because the battery is integrated into the device itself. This design-related issue can be addressed somewhat by having a separate skull-mounted power module which resides adjacent to the neuronal-stimulator. However, surgery for selective removal/replacement of the power source is still invasive. Further, aside from issues of replacement, in ongoing use of implanted devices, a more robust supply of power can provide improved therapy.
The current invention can incorporate a number of existing technologies such as U.S. Pat. No. 6,108,579, which discloses a battery-monitoring apparatus and method which includes features of tracking power usage, monitoring battery state, and displaying the estimated remaining life of the battery power source. U.S. Pat. No. 6,067,473 discloses a battery-monitoring apparatus and method which includes features of providing audible warnings of low battery life using both tones and pre-recorded verbal warnings of battery depletion. U.S. Pat. Nos. 5,957,956, 5,697,956, 5,522,856, and US 20050021134 to Opie, and 20050033382 to Single, disclose devices having features such as: relatively small mass and a minimal rate of power consumption; means for optimizing current drain; improved shelf storage capacity; minimizing the power requirements of battery power sources; temperature regulation of the power source; and dual battery implementation including use of back-up battery to avoid power disruption. U.S. Pat. No. 7,127,293 to MacDonald describes a biothermal power source for implantable devices and describes methods and materials which are suitable for use in the current invention.
There is a need to provide an improved power supply means for recharging of a power supply of an implantable medical device. Power supply improvements will allow improvements in the performance of the device. Recharging should not require recharging or replacement of the power source in a manner which is unreliable or which places an undue burden on the patient.
The invention provides improved power harvesting, generation and supply and can rely upon naturally occurring sources of energy for at least a portion of its recharging needs. The invention also provides improved power harvesting of transmitted energy.
A rechargeable power module for powering implantable devices includes a power storage module connected to said implantable device and a power charging module operatively connected to the power storage module.
When the power charging module harnesses thermoelectric power, it has at least a first thermal module and a second thermal module which provide power from a thermal gradient. These two modules can be intra-cranially and extra-cranially disposed, respectively. The power charging module is configured for generating an electrical current from a thermal energy gradient, and for charging said electrical storage module with said electrical current. The rechargeable power module also contains control circuitry for controlling power related operations, as well as charge monitoring circuitry for monitoring rates and levels of charge of the power storage module. The rechargeable power module may also contain alerting circuitry for generating an alert signal whenever the extent to which said electrical storage device is being charged, with said electrical current, falls below a specified value. A disruption module can break the physical connection between the first and second thermal modules, or between the rechargeable power module an components of the implanted device.
When the power charging module is a light-based power charging module, it can have at least one extra-cranially disposed surface that is configured for generating an electrical current from said light source (e.g., the sun or a synthetic means), and for charging said power storage device with said electrical current.
When the power charging module harnesses RF energy which is ambient and naturally occurring, or which is actively transmitted by a transmitter device, then an antenna has at least one extra-cranially disposed surface which is disposed for harnessing the RF energy. The energy harvesting antenna may also be used for transmission of data, and can be disposed within a ferrule that resides within the skull, within the top side of a neurostimulator device disposed within the ferrule, or within the ferrule itself. When the implanted device is a neurological or cardiac device having leads, then one or more of these leads, as well as sheaths which house the leads can be used, at least a portion of the time, as an antenna for energy or data transmission or reception.
The power charging module may utilize external devices which alter temperature, light levels, magnetic or RF energy available for recharging the power module.
The rechargeable power supply can also contain an alerting module for providing energy-related alerts to a user and a historical charge module which can be configured to generate an alert signal related to power consumption and harvesting. For example, an alert may be sent whenever the cumulative extent to which said electrical storage device is being charged with said electrical current falls below a specified value.
In accordance with some implementations, a wirelessly powered medical device includes: a wireless energy harvesting module configured to receive at least one type of wireless power; a power management module configured to manage and monitor power harvested by the wireless energy harvesting module; a sensing module configured to provide sensing data; and a control module configured to communicate with the power management module and with the sensing module; wherein the power management module and the control module are configured to communicate with each other to modify an interrelation of operations of the wireless energy harvesting module and the sensing module, including to compensate for influences of wireless power harvesting on operation of the sensing module.
In accordance with some implementations, a wirelessly powered medical device includes: a wireless energy harvesting module configured to receive at least one type of wireless power; a power management module configured to manage and monitor power harvested by the wireless energy harvesting module; a stimulation module configured to provide a treatment operation; and a control module configured to communicate with the power management module and with the stimulation module; wherein the power management module and the control module are configured to communicate with each other to modify an interrelation of operations of the wireless energy harvesting module and the stimulation module, including to compensate for influences of wireless power harvesting on the treatment operation provided by the stimulation module.
There are further provided methods for increasing wireless energy recharging capabilities of the system including methods for increasing the thermal gradient used to generate power and increasing the wireless energy harvesting by increasing the wireless energy which is available, received, and harvested by the implantable power harvesting device.
Features of the invention will be described by reference to the specification and to the following drawings, in which like numerals refer to like elements, and in which:
The present invention will be described in connection with a preferred embodiment. There is no intent to limit the invention to the embodiments described. The intent is to generalize the principles disclosed here to all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as disclosed within the following specification and claims.
The rechargeable power system 10 can harness power using at least one of thermoelectric derived energy 300, solar derived energy 330, motion-based energy 332, RF harnessed energy 334 using far-field and medium-field techniques, and energy harnessed from magnetic fields using near-field techniques 336. When utilizing far-field techniques the modules 334 can be based upon Powercast technology which provides for energy harvesting of both ambient and transmitted energy, and may include at least one antenna and associated harvesting circuitry. Some related technologies for transmission and reception, which can be utilized by the current invention have been filed by Powercast and include patent applications for example, US20070010295, US20060281435, US20060270440, US20060199620, US20060164866, and US20050104453. Some related technologies filed by eCoupled include, for example, Inductive Coil Assembly (U.S. Pat. Nos. 6,975,198; 7,116,200; US 2004/0232845); Inductively Powered Apparatus (U.S. Pat. No. 7,118,240 B2; U.S. Pat. Nos. 7,126,450; 7,132,918; US 2003/0214255); Adaptive Inductive Power Supply with Communication (US 2004/0130915); Adaptive Inductive Power Supply (US 2004/0130916); Adapter (US 2004/0150934); Inductively Powered Apparatus (US 2005/0127850; US 2005/0127849; US 2005/0122059; US 2005/0122058. Splashpower has obtained patents such as U.S. Pat. No. 7,042,196. All these patents and patent applications are incorporated by reference herein and describe technologies which will be generally understood herein as wireless power systems that relate to the invention including RF- and near-field-induction-related wireless power transmission and wireless power reception.
The energy harnessing modules 300, 330-336 are connected via the signal router 204 of the power management module 200 to control circuit 206 by leads 306 which provide electrical contact between the harnessing modules 300, 300-336 and the power management module 200. Control circuit 206, in turn, is operatively connected to power regulator 208 circuitry which includes safety and isolation components. The power regulator 208 provides direct current to at least one battery of a first battery 222a, and a second battery 222b of the energy storage module 220. Although only 2 batteries are shown here, many batteries, capacitors, may be used in the power storage module, and these may be stored together, or in physically distinct regions of the device, and even outside of the device. Although the electrical storage module 220 would normally contain at least one battery 222a, b which can be rechargeable, other electrical storage devices can be used such as traditional capacitors or capacitors constructed of carbon, nanomaterials, or other suitable materials. The capacitors can be comprised of multilayer dielectric materials having capacitors and insulators or other type of hybrid compositions (e.g., U.S. Pat. No. 6,252,762 “Rechargeable hybrid battery/supercapacitor system”; U.S. Pat. No. 5,993,996 “Carbon supercapacitor electrode materials”; U.S. Pat. No. 6,631,072 (“Charge storage device”); and U.S. Pat. No. 5,742,471 (“Nanostructure multilayer dielectric materials for capacitors and insulators”). The storage module 220 may be designed without a battery, as may occur, for example, if the power module 108 of the implanted device 100 is to be primarily relied upon or if the device will rely upon external energy sources during its operation.
A power monitor 210 is connected to the storage module 220 and contains sensors for monitoring the power level of batteries 220a,b as well as rates of charge and discharge. The power monitor 210 can cause the power management module 200 to issue an alert signal using the alert module 110 of the implantable device 100 and is capable of providing a warning to a user when the power being generated, stored, or which is in reserve is inadequate. The probes 115 can be used to generate audible, visual, vibrator, or other type of alerts to provide warnings of low battery life. An external patent programmer 125 can display a history of usage, recharging related historical information, and information related to the remaining life of the battery, for example, as may be similar to that shown in
In a number of preferred embodiments the rechargeable power system 10 relies upon the Seebeck effect which is also known as the “Peltier-Seebeck effect” or the “thermoelectric effect”. The Seebeck effect is the direct conversion of thermal differentials to electrical voltage. It is often produced using two junctions of dissimilar temperatures and metals. U.S. Pat. No. 5,565,763 (‘Thermoelectric method and apparatus’) and U.S. Pat. No. 4,095,998 (‘Thermoelectric voltage generator’) describe implementing the Seebeck effect within energy producing devices.
Although the device 100 of
Condition 1 shows the four thermal modules with relative temperatures that may occur in “normal” operation. Condition 2 shows temperatures that may occur in an “opposite” operation, where the polarity reversal devices of
In one embodiment, the voltage produced by thermal pair 1 is combined with the voltage produced by thermal pair 2, by circuitry in the power manager 200. In another embodiment, the thermal modules within thermal pairs 1 and 2 are electronically fused so that 304A and 304B form the “cold” thermal pair (paths 306A and 306C are routed to 306 c′) and 302A and 302B form the “hot” thermal pair (paths 306B and 306D are routed to 306D′). In this case and the voltage produced is a function of the average differential between these two new functional modules. Combining the output voltages from the two thermal pairs should likely be equivalent to what is obtained by rearranging the electrical paths to form 1 new “combination” thermal pair, but due to real world differences one of these embodiments may perform slightly better than the other. Further, any performance differences between these two strategies can be a function of the ranges of temperature differential, and the power management module 200 can select which strategy is used based upon selected ranges as well as other operational factors (e.g. increased temperature variability in one of the thermal modules).
The power management module 200 can be powered off of the energy harvesting modules 300, 330-336 or by the batteries 220. It is expected that when the temperature differential is greater than 2 degrees Celsius, electrical energy will be produced sufficiently to run the control circuit 206. When the temperature differential is closer to 1 degree Celsius, adequate temperature differential may still be sufficient to provide adequate electron flow to control circuit 206.
Although a square configuration is shown, it is understood that the modules may be of various shapes and sizes, and may be adjusted according to the sites of implantation. Materials may also permit the modules to be constructed so that these have some degree of flexibility. While a single structure is shown in each of the
The PN stacks 305 are here shown as thin layers sandwiched between thermoelectric pairs. The PN stacks can be comprised of several PN layers which are oriented and organized in a number of fashions as is well known. U.S. Pat. No. 6,207,887 (‘Miniature milliwatt electric power generator’) shows
Power Management, Reporting, and Control.
The power monitor 210 may use the memory 112 of the device 110 to create a historical record of power generation and consumption such as is graphically shown in
In the lower panel of
In order to keep the battery 220 from becoming discharged below a particular level the alert module 110 can issue alerts when power levels become critically low so that the patient will make certain that the battery 220 is recharged in the near future. The alert module 110 may also be configured to shut down the device 10, or portions of the device 10, or to limit operation to certain functions defined as a lower power state, when a particular critical level is reached so that there is enough energy to perform essential operations, such as operations relating to recharging the battery.
The re-chargeable power module 10 can be configured so that if the batteries 220 become completely discharged, the module 10 can supply emergency power to the device 100, or can initiate recharging operations using purely wireless power harvesting, if sufficient wireless power becomes available. This type of re-start operation can also comprise marking the occurrence of a complete system shutdown in the storage module 112. When a minimum battery power is reached the storage module may store the time of the shut-down in memory of module 112. Accordingly, upon restart, the current time and date can be re-established using an external patient device 125, in order to calculate how long the device was non-functional. Storing power ‘shut-downs’ and ‘re-starts’ in the historical module 112, may also lead to the generation of an alert signal being sent by the alarm module 110, to a central station which the device communicates with using the communication module 106. This is important since if patients are non-compliant with respect to ensuring sufficient energy harvesting, then the implanted device will not provide much therapeutic benefit. Unlike implantable devices which use very little power, when implantable devices are configured to use more energy, it is important that the patient is compliant in ensuring that energy harvesting is sufficient for proper system operation.
In one instance, if the patient had not generated more power than indicated by the “minimum power generation threshold level” by a selected time (e.g. 6 p.m.) then the alert module would have issued an alert signal to the patient. Rather than displaying results for the last 24 hours, the graph could have been computed upon charging patterns calculated for other prior periods such as the last week or month. In this manner the patient can learn about, for example, how daily activity influences temperature around the thermal modules and can increase their subsequent ability to charge the implanted device as needed. In addition to power generation, other data can be displayed including power usage, temperature of thermal modules, and differential temperatures of thermal pairs (as well as the pairs that were created).
Alert signals can be generated in order to warn the patient when battery power becomes lower than a specified amount, when the average rate of power consumption is more than the rate of power generation for a selected interval, when the slope of residual power by time has a value that is more than a selected level for a specified amount of time, as well as numerous other characteristics related to charging, discharging, and residual power supply. Alerts can also be generated if the temperature as recorded from thermal sensors 115 near thermal modules 300 indicate that temperatures are outside of a normal range for an extended amount of time, for example, in a manner that is not beneficial to generating power in an expected fashion.
Power management and control provided by the power management module 200 is needed for disentangling power related operations from other operations of the device 100. It is likely that in devices 100 which utilize sensing, certain sensing operations should be halted, delayed, attenuated, or otherwise modified during a portion of the charging operations, and subsets of steps related to carrying out these operations, especially if the wireless harvesting includes near-field induction transmitters. In devices 100 which utilize stimulation, certain stimulation operations should be halted, delayed, attenuated, or otherwise modified during a portion of the charging operations, and subsets of steps related to carrying out these operations, especially if the wireless harvesting includes receiving energy which is above a specified level. In devices 100 which utilize communication with external devices, certain communication operations should be halted, delayed, attenuated, or otherwise modified during a portion of the charging operations, and subsets of steps related to carrying out these operations, especially if the data communications include alerting and/or transfer of diagnostic data related to an alert signal. In devices 100 which utilize sensing, stimulation, or communication, transmission of wireless power or power harvesting operations should be halted, delayed, attenuated, or otherwise modified during a portion of the non-recharging operations, and subsets of steps related to carrying out these operations.
Additionally, the re-charging circuitry may be configured to work with the sensing, stimulating, and communication circuitry so that various charging operations and related phenomena which are influencing the sensing, stimulation, or communication subsystems of an implanted device are ignored, compensated for, or otherwise addressed by these subsystems, and associated operations and algorithms. This type of compensation may occur, for example, using communication between the power management module 200 and the sensing/stimulation 116, communication 106, or diagnostic 118 module. Selected non-charging operations can occur simultaneously with charging operations when filters and circuitry are provided to isolate the effects of charging-related operations and treatment related operations. For example electrical artifacts due to charging can be filtered out, subtracted, or made to occur in a time locked manner so that the artifacts occur in a controlled rather than spurious manner.
Thermal Issues of Energy Harvesting, Usage, Storage, and Stimulation.
Some preferred embodiments of implanted medical systems which include neurostimulators, ferrules, rechargeable power supplies, and thermal-cooling are shown in
In
In the case where the receiver plate 350b serves as an induction harvester, it may be divided into at least a first portion and a second portion, each of which may be electrically and thermally insulated from each other, which may make functional (data or power) communication with external devices (and appropriate polarities) and which may further make respective electrical connection with skull mounted components, or a ferrule which communicates with the device, or at least one implanted device itself.
Energy harvesting circuits and antennas can be configured to receive RF energy, or wireless energy which has positive and negative charge polarities. When these components are encased within a metal such as titanium (i.e. when these are within the housing of an implanted device), this encasement may be designed with partitioning, non-conductive, and insulating materials which are disposed within the housing material so as to permit differential charges to be induced on the energy harvesting circuits and antenna'"'"'s (i.e. in order to circumvent or attenuate field dispersion and isopotential surfaces). Alternatively, the receivers may be independently housed and connected to the implanted device in a manner which enables electrical isolation so that shorting, grounding, and isopotential gradients do not hinder wireless charging functionality.
It is one advantage of the current invention to provide an extra-cranially situated power harvester and/or rechargeable power supply which powers an intra-cranially situated, or skull mounted, device 100 which may be a neurostimulator. In a preferred embodiment, a portion of the recharging power related components are situated at least 0.5 inches away from the implanted device.
Wireless Energy Transmission and Reception Strategies.
Generally, the power received decreases with the amount of distance between the wireless transmitter and the receiver. While a skull mounted receiver plate 352 can assist in energy transfer with neurostimulation electrodes, when the implanted device is a cardiac-related device such preferential disposition of an wireless energy receiver such as an antenna will not help much. The transmission of energy, rather than energy reception, can have improved features which can assist in increasing wireless energy harvesting. A number of embodiments can serve to decrease the transmission distance and to increase patient compliance with respect to maintaining adequate charge levels.
In one embodiment the power transmitter can be implemented within modified versions of commonly used objects such as furniture. For example, a power transmitter can be located within:
- a. a back of a chair and further with the transmitter situated approximately adjacent to the patient'"'"'s upper torso;
- b. a mattress or mattress cover and further with the transmitter situated approximately adjacent to the patient'"'"'s upper torso;
- c. a wearable vest, and further with the transmitter situated approximately adjacent to the patient'"'"'s frontal and rear torso section;
- d. an article of clothing such as a chest strap, brassier, wristband, armband, headband, or hat;
- e. a blanket, blanket cover, or sheet, and further with the transmitter situated approximately adjacent to the patient'"'"'s upper torso; and,
- f. a seat cushion configured to overlap or be attached to the back support portion of a chair and further with the transmitter situated approximately adjacent to the patient'"'"'s upper torso.
Because it is wasteful to operate these types of power transmitters continuously, power transmission may be linked to a sensor which will automatically toggle the state of the power transmission. For example, a wireless power transmitter which is realized within a back of a chair may further comprise a motion sensor module, a temperature sensor module, a light sensor module, or a pressure sensor module, any of which may be used to determine if an individual (e.g., a patient with an implanted device) is sitting in the chair. The wireless power transmitter may also contain a sensor module which can receive an RF, sonic, or other signal from an implanted device that it is within the vicinity of the wireless power transmitter so that wireless power transmission may be initiated. The wireless power transmitter may also include a timer or real-time clock so that power transmission can occur for a selected amount of time, a selected amount of time after a patient activates a sensor module, during specific times of the day, and otherwise in manners that can be programmable and adjustable by the patient or a medical practitioner.
Although wireless power may be provided using far-field (e.g., RF) energy transmission, the above features can be implemented with transmission of other forms of wireless energy such as heat, light, induction, near and medium field transmission. In fact, induction type wireless charging is probably better suited for charging implanted devices if these are close enough to a body surface of the patient. Further, cooling devices may also be utilized in order to assist in thermoelectric power generation.
Wireless energy utilization can be realized by the implantable device using relatively new technologies for receiving the energy. Such technologies are related to inductive and far-field means of transmission and reception and include transmission by radiofrequency energy, thermal energy, sound energy, and other sources radiant energy. Schemes to achieve wireless energy transmission and harvesting is disclosed in US 2006/0281435 for ‘power devices using RF energy harvesting’, US20060270440 for a ‘power transmission network’ and a set of related disclosures filed by Shearer et al. and Greene et al, and which describe technology known as Powercast. The Powercast technology can be used for both transmission and reception (harvesting) of transmitted energy or of ambient energy such as radio-wave energy which is present in the devices environment. The Powercast technology can capture wireless energy using both near-field (e.g. inductive) and far-field transmitters. Alternative transmission-harvesting strategies have been described with sound or other energy types (e.g., U.S. Pat. No. 6,858,970 for a ‘multi-frequency piezolelectric energy harvester’, US 20050253152 for ‘Non-contact pumping of light emitters via non-radiative energy transfer’), or resonant energy harvesters comprising resonant power antennas which tuned to the power transmitter'"'"'s (beacon'"'"'s) frequency in order to accomplish “nonradiative resonant energy transfer” (e.g. Soljacic et al. 2006, http://web.mit.edu/newsoffice/2006/wireless.html).
In order for implantable devices to effectively operate using wireless energy a number of considerations must be addressed. Firstly, the issue of energy reception should be addressed. When the energy harvesting module utilizes antennae larger volumes may be associated with improved energy capture. Further, although one energy harvester may be utilized, joint utilization of a plurality of harvesting modules can increase the amount and stability of the supplied power. Implanting the harvesting modules within the patient should be limited by issues related to implantation and explanation of the devices, patient comfort, and energy reception. Generally, the deeper implantation results in a corresponding decrease of energy reception for an equivalent amount of transmitted energy.
The human skull provides a unique location for implantation of energy harvesting components, including an antenna. In contrast to intracranial located positions, the surface of the skull provides a relatively large surface on which device components may reside. A skull mounted energy harvesting module has a number of benefits such as increased heat dissipation, increased energy transfer due to less intervening tissue, and increased capacity for retaining larger components. A preferred embodiment, skull mounted energy harvesting components may be configured according to the contours of a particular patient'"'"'s skull, can be constructed in a flexible manner so that these may bend to the shape of the skull, or may be constructed in sections that are flexibly held together and which permit cooperation with the contour of the skull. The skull mounted energy harvesting device components can reside within a flexible and biocompatible material such as a silicone based sealant, or the like (Medtronic US20060184210 entitled ‘explanation of implantable medical device’). In another embodiment, an implantable or intra-cranially residing neurostimulator is powered by an extra-cranially and approximately skull mounted harvesting device. In another embodiment, an implantable or intra-cranially residing neurostimulator is powered by a cranially residing skull mounted harvesting device, which may be affixed directly within the skull or indirectly via a ferrule device. Two or more energy harvesting devices, or related antennae, may be mounted bilaterally, over opposing hemispheres or split between frontal and posterior locations. The two or more antennae may be related to different uses such as wireless transmission/reception of data and power, respectively. Antennae may consist of various electroconductive harnessing substances such as metal, water, saline, saline laced with metallic flakes, or other suitable medium.
In one embodiment, recharging is halted or adjusted when non-charging operations such as sensing or stimulation operation are to occur. During sensing, this may be done in part to reduce any distortion of the sensed signals. For example, if the ‘can’ is serving as a ground for a mono-polar electrode, then if sensing occurs simultaneously with charging operations then the energy fluctuations associated with charging operations could distort, contaminate, or otherwise shift the recorded potentials.
For this reason, or due to other considerations, the implanted device could be triggered to send control commands to the wireless power harvester modules to turn energy harvesting ‘on’ or ‘off’. Alternatively and additionally, the implanted device could send control commands to the wireless power transmitter to turn energy transmission ‘on’ or ‘off’, or can request that energy transmission be temporarily decreased or increased, or otherwise adjusted. Rather than simply shutting off, a temporarily increase or decrease can occur as a specified ramp-down or ramp-up function which may be related to charging operations or direct power supply to a in implanted device. Further, there can exist a “sleep” function which causes the power transmission to be stopped for a pre-defined amount of time before it is automatically restarted. In this manner, energy is not wasted by requiring the implanted device or the external patient programmer to send a ‘restart’ signal.
Rather than requiring the implanted device to send commands directly to a wireless power transmission device, the implanted device can control the wireless power transmitter indirectly through the external patient controller, which can be configured to communicate with the power transmitter as well as the implanted device. Additionally the external patient controller can be configured to send control signals to the wireless power transmitter in order to alter its activity, so that it may better perform its own operations. For example, the external patient controller can send control signals to the wireless power transmitter before it initiations communication with the implanted device or sends commands to the implanted device to initiate operations requiring stimulation or sensing. Rather than requiring wireless power companies to provide specialized transmitters that can receive commands from an external patient device, the wireless power transmitter can be power by a mains source which is fed to it by a programmable power supply created by a medical device manufacturer. Accordingly, a wireless power transmitter can be used, and a level of control can be obtained by controlling the power fed to the transmitter itself.
In one embodiment, the implanted device can provide alerts and status indications for level and power related characteristics such as the amount of power recently obtained, present power levels, or present strength of reception. Alternatively, or additionally the external patient programmer can also be configured with a wireless power harvester and/or ‘power monitor’ module adapted to measure the strength of transmitted energy that is being received, the amount of energy being harvested, or an energy profile which can contain an estimation of energy present at different wavelengths (e.g. a spectral profile of energy). Although the energy implanted wireless power components and external wireless power components may receive different amounts of energy, “Eint” and “Eext”, respectively, these two amounts can be compared and a transfer function can be used to estimate the amount of energy actually received by the implanted harvester.
Additionally, the external patient controller can contain a “power profile” module which can adjust the amount of remaining “estimated power” for the implantable device by subtracting power which it estimates the internal device is consuming based upon the basal rate of energy usage of the device, notices it obtains from the implanted device that it has performed operations such as stimulating, and commands sent to the implanted device by the external device such as commands related to changing power state (e.g. going into a sleep state or commands to initiate stimulation or sensing operations).
Although the implanted wireless power harvester module may operate in a fixed manner, it may also adjust the characteristics of the harvester module in order to generate power from different frequencies of wireless energy which are present. The energy reception parameters can be adjusted to bias the reception of frequency specific energy so that reception of selected frequency ranges are facilitated or blocked. The energy harvester can utilize reception parameters which can be adjusted to match the frequencies of the energy which is received with the profile of energy being transmitted by a wireless power transmitter. This may occur because in different locations, different transmission profiles, reception profiles, or transmission-reception profiles will allow energy transmission, harvesting, or both to occur more efficiently or reliably or to provide different amount of energy as may be required by the implanted device. Further, when ambient levels of energy are relied upon, rather than wireless power transmitted energy, the spectral profile of the ambient energy may change over time and in different locations. Although the implanted device may automatically adjust the parameter of its harvesting module (which may occur with changes in the energy transmitting module) in order to adjust (i.e. improve) energy harvesting operations, this may require energy and could result temporary energy decreases (e.g. if an unsuccessful profile is selected). Accordingly the external patient programmer may perform these optimization/calibration processes and then use the results of these operations to adjust the characteristics of the implanted energy harvester.
Calibration test-signal procedures can be implemented when normal energy harvesting is not occurring. Additionally, in addition to using the external patient controller, an energy monitoring device (or only a sensor component) may be worn as a watch, or, in the case of a neurostimulator, can be incorporated into a person'"'"'s hat or eyeglasses in order to sense energy fields which are similar to that which will be experienced by the implanted device.
Energy profile sensing can occur within the implanted or external energy monitoring devices in order to adjust parameters related to energy harvesting and increase or stabilize energy reception. While radiowaves may often be a main source of energy for the wireless power harvester device, if a patient is located in an area with larger sources of energy, then the wireless power harvester should be adjusted accordingly. For example, Extremely low frequency (ELF), voice frequency (VF), and very low frequency (VLF) may be ambient in an environment at higher levels than radiofrequency. Such an example occur in the case where a patient is situated in front of a television, so that 50 or 60 Hz line noise, and possibly the refresh rate of television screen, as well as the subharmonics and harmonics will be larger than radio-wave energy. At least one component of the energy harvester module should be configured to capture this type of energy and its harmonics. If the patient is outdoors in the country, then radiowaves may be larger than sources of 60 Hz, and the receiver should be tuned to optimize capture of this different energy profile. Additionally, the wireless power harvester module may contain two different harvesting circuits (e.g. including antennae and resonators) which are both active so that energy can be harvested at these very different locations of the electromagnetic spectrum.
The entire disclosure of all cited references including United States patents, applications, websites, and technical/scientific/engineering publications are hereby incorporated by reference into this specification as if fully recited herein. Using similar design features such as electrical or optical connections will be obvious to those skilled in the art, and it will also be obvious to those skilled in the art that the wireless power generation modules and process described herein may be scaled either up or down in size to suit power requirements of specific implantable devices. Any of the aforementioned changes may be made in the apparatus without departing from the scope of the invention as defined in the claims.
All section titles are provided for convenience and are merely descriptive and thereby are not intended to limit the scope of the invention.