US20230371901A1 - Devices, systems, and methods for monitoring and treatment of injuries - Google Patents

Devices, systems, and methods for monitoring and treatment of injuries Download PDF

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Publication number
US20230371901A1
US20230371901A1 US18/247,759 US202118247759A US2023371901A1 US 20230371901 A1 US20230371901 A1 US 20230371901A1 US 202118247759 A US202118247759 A US 202118247759A US 2023371901 A1 US2023371901 A1 US 2023371901A1
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subject
array
target location
medical device
proximal
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Inventor
Amir Manbachi
Nicholas Theodore
George L. Coles
Ana M. AINECHI
Sandeep KAMBHAMPATI
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Johns Hopkins University
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Johns Hopkins University
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Priority to US18/247,759 priority Critical patent/US20230371901A1/en
Assigned to THE JOHNS HOPKINS UNIVERSITY reassignment THE JOHNS HOPKINS UNIVERSITY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AINECHI, ANA M., KAMBHAMPATI, Sandeep, THEODORE, NICHOLAS, Coles, George L., MANBACHI, Amir
Publication of US20230371901A1 publication Critical patent/US20230371901A1/en
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    • A61M2230/50—Temperature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/04—Electrodes
    • A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
    • A61N1/0551—Spinal or peripheral nerve electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
    • A61N1/3606—Implantable neurostimulators for stimulating central or peripheral nerve system adapted for a particular treatment
    • A61N1/36062—Spinal stimulation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
    • A61N1/36128—Control systems
    • A61N1/36135—Control systems using physiological parameters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372—Arrangements in connection with the implantation of stimulators
    • A61N1/375—Constructional arrangements, e.g. casings
    • A61N1/3756—Casings with electrodes thereon, e.g. leadless stimulators

Definitions

  • SCI spinal cord injury
  • brain injury brain injury
  • burn injury or another type of serious injury.
  • Spinal cord injury can be a devastating condition with lifelong complications.
  • Spinal cord injury monitoring and interventions remain in their infancy compared with advances made for other types of injuries.
  • monitoring of intracranial pressure and tissue oxygenation are mainstays in the treatment of acute traumatic brain injury (TBI), and information gathered from this monitoring is also helpful in the prevention and mitigation of secondary injury.
  • TBI acute traumatic brain injury
  • SCI leads to severed axons, glial scarring, and a global lack of innate regenerative capacity at the injury site during the acute phase. Secondary injury is common due to subsequent ischemia and inflammation, and it leads to further tissue destruction, prolonging recovery.
  • Acute inflammation in the spinal cord exacerbates the primary SCI injury, triggers secondary injury, worsens ischemia and scarring, and inhibits recovery.
  • Chronic SCI results in long-term systemic inflammation, which is clinically exacerbated by a state of chronic immunosuppression.
  • Loss of motor control is perhaps the most obvious sequela of SCI.
  • multiple systems including the functions of cardiovascular and bladder control, are affected after this injury.
  • Urological complications after SCI require lifelong management.
  • SCI also causes profound disruption of the cardiovascular (CV) system, particularly in motor-complete injuries in the cervical and upper thoracic levels.
  • CV dysregulation leads to persistent hypotension, bradycardia, orthostatic hypotension, and episodes of autonomic dysreflexia, which drastically diminish quality of life by affecting overall health and preventing patients from engaging in activities of daily life.
  • the simultaneous restoration of motor, CV, and urologic systems would allow patients with SCI and certain other injuries to fully participate in daily activities.
  • the present disclosure relates, in certain aspects, to methods, devices, systems, and computer readable media of use in monitoring of and treatment of an injury in a human or other mammal.
  • the injury may be a spinal cord injury.
  • the present disclosure provides a system, device or corresponding method for treatment of an injury in a human or other mammal.
  • the system may include an implantable device configured to be implanted into a human body, the implantable device having a sensing device and a treatment device, the sensing device configured to sense a first condition of the injury and to generate a signal corresponding to the sensed first condition, the treatment device configured to provide treatment to the injury, a wearable device configured to be wearable on an external portion of the human (or animal) body, the wearable device configured to sense a condition of the human (or animal) related to the injury, and a controller connected to the implantable device and to the wearable device, the controller configured to receive signals from the implantable device and the wearable device and to control the implantable device to selectively cause the treatment device to apply the treatment based on the signal corresponding to the sensed condition.
  • the medical devices or systems disclosed herein include numerous applications.
  • the medical devices or systems are configured for imaging and neuromodulation/stimulation using ultrasound.
  • the medical devices or systems are configured for microflow sensing, remote ablation of selected tissue (e.g., tumor tissue), drug delivery, thermal energy delivery, deep tissue thermometry, and/or the like.
  • the medical devices, systems, or components thereof are configured as omnisonic wearables (e.g., patches, etc.).
  • the medical devices are configured to perform remote deep-tissue temperature sensing using ultrasound thermometry. The temperature can be determined based on how changes in temperature affect the speed of sound, and hence the propagation and time-of-flight of the ultrasonic waves.
  • the present disclosure provides a medical device that includes a body structure that comprises at least portions of at least three subassemblies, which subassemblies comprise at least one imaging array or device, at least one stimulation array or device, and at least one electrode array or device.
  • one or more of the subassemblies are configured to perform one or more diagnostic and/or therapeutic applications.
  • the subassemblies are positionable within communication of at least one target location of a subject.
  • the imaging array is structured to generate and/or capture images (e.g., still and/or video images) at least proximal to the target location of the subject when the imaging array is positioned within communication of the target location of the subject.
  • the imaging array is configured with flow sensing capabilities, which enable, for example, slow flow (i.e. microcirculation) to be monitored (e.g., at one or more time points) in small micro-vasculature of the subject.
  • the stimulation array is structured to administer at least a first therapy at least proximal to the target location of the subject when the stimulation array is positioned within communication of the target location of the subject.
  • the electrode array is structured to administer at least a second therapy at least proximal to the target location of the subject when the electrode array is positioned within communication of the target location of the subject.
  • the subassemblies are operably connected, or connectable, to at least one power source and/or at least one controller.
  • one or more of the subassemblies are configured to perform both imaging and therapeutic ultrasound.
  • a kit includes the medical device disclosed herein.
  • the medical devices disclosed herein, whether configured as wearable and/or implantable devices comprise a photoacoustic transceiver that provides light pulses to the target location (e.g., a monitoring site and/or treatment site) and receives ultrasound energy from the target location.
  • the medical devices whether configured as wearable and/or implantable devices, comprise a photothermal transmitter and a thermal camera in which the photothermal transmitter provides light pulses to the target location (e.g., a monitoring site and/or treatment site) and the thermal camera detects thermal changes at the target location.
  • the medical devices are configured to perform deep-tissue temperature sensing.
  • the present disclosure provides a system that includes a medical device comprising a body structure that comprises at least portions of at least three subassemblies, which subassemblies comprise at least one imaging array, at least one stimulation array, and at least one electrode array.
  • the subassemblies of the medical device are positionable within communication of at least one target location of a subject.
  • the imaging array of the medical device is structured to generate and/or capture images (e.g., still and/or video images) at least proximal to the target location of the subject when the imaging array is positioned within communication of the target location of the subject.
  • the stimulation array of the medical device is structured to administer at least a first therapy at least proximal to the target location of the subject when the stimulation array is positioned within communication of the target location of the subject.
  • the electrode array of the medical device is structured to administer at least a second therapy at least proximal to the target location of the subject when the electrode array is positioned within communication of the target location of the subject.
  • the medical device includes at least one power source operably connected to the subassemblies.
  • the system also includes at least one controller operably connected to the subassemblies, which controller comprises, or is capable of accessing, computer readable media comprising non-transitory computer executable instructions which, when executed by at least one electronic processor, perform at least: generating and/or capturing images at least proximal to a target location of a subject using the imaging array; administering at least a first therapy at least proximal to the target location of the subject using the stimulation array; and administering at least a second therapy at least proximal to the target location of the subject using the electrode array.
  • the therapies administered using devices and systems disclosed herein include photoacoustic, photothermal, and other fusion modalities, among other therapeutic applications.
  • the non-transitory computer executable instructions comprise one or more machine learning algorithms that effectuate generating and/or capturing the images and/or administering the first and/or second therapies.
  • the machine learning algorithms comprise one or more artificial neural networks.
  • the machine learning algorithms are used to automatically detect a targeted location in a subject (e.g., an anatomically relevant or curved structure, such as a spinal cord), track movement of the targeted location in the subject (e.g., while accounting for motion-related artifacts due, for example, to a cardiac cycle or respiratory effects), and the like.
  • the system further comprises one or more additional medical devices operably connected to the power source and to the controller, which additional medical devices are structured to monitor one or more additional physiological properties of the subject and/or to administer one or more additional therapies to the subject.
  • the present disclosure provides a computer readable media comprising non-transitory computer executable instruction which, when executed by an electronic processor perform at least: generating and/or capturing images at least proximal to a target location of a subject using at least one imaging array of a medical device that comprises a body structure that comprises at least portions of the imaging array; administering at least a first therapy at least proximal to the target location of the subject using at least one stimulation array of the medical device that comprises the body structure that comprises at least portions of the stimulation array; and administering at least a second therapy at least proximal to the target location of the subject using at least one electrode array of the medical device that comprises the body structure that comprises at least portions of the electrode array.
  • the present disclosure provides a method of providing medical care to a subject.
  • the method includes generating and/or capturing images at least proximal to a target location of the subject using at least one imaging array of a medical device that comprises a body structure that comprises at least portions of the imaging array.
  • the method also includes administering at least a first therapy at least proximal to the target location of the subject using at least one stimulation array of the medical device that comprises the body structure that comprises at least portions of the stimulation array.
  • the method also includes administering at least a second therapy at least proximal to the target location of the subject using at least one electrode array of the medical device that comprises the body structure that comprises at least portions of the electrode array, thereby providing the medical care to the subject.
  • the method includes monitoring blood flow (e.g., slow microflow in small micro-vasculature, microflow detection, or microcirculation imaging) in the subject using the imaging array.
  • the imaging array comprises an ultrasound device and the method further comprises generating and/or capturing ultrasound images at least proximal to the target location of the subject.
  • the method includes monitoring one or more physiological properties (e.g., neural activity, pulsatility of the spinal cord, or the like) of the subject using the imaging array.
  • the method includes continuously monitoring the target location (and pulsatility) of the subject over a selected period of time.
  • the method further includes positioning the medical device at least proximal to the target location of the subject using a gel (e.g., a shear-thinning material (STM) and/or shear-thinning biomaterial (STB)) and/or other attachment mechanism.
  • a gel e.g., a shear-thinning material (STM) and/or shear-thinning biomaterial (STB)
  • the present disclosure provides a method of positioning a medical device proximal to a target location of a subject.
  • the method includes applying at least one shear-thinning material (STM) (e.g., a shear-thinning biomaterial (STB)) to the target location and/or to a portion of the medical device.
  • STM shear-thinning material
  • STB shear-thinning biomaterial
  • the medical device is fabricated from one or more magnetic resonance imaging compatible (or MR-safe) materials. In some embodiments, the medical device is fabricated from one or more biodegradable, bioresorbable, and/or biocompatible materials. In some embodiments, the medical device is configured to continuously monitor perfusion, autoregulation, pulsatility of the spinal cord, temperature, flow, or pressure, at least proximal to the target location of the subject substantially in real-time when the subassemblies are positioned within communication of the target location of the subject. In some embodiments, the medical device includes pairs of the imaging arrays, the stimulation arrays, and the electrode arrays.
  • the pairs of the imaging arrays, the stimulation arrays, and the electrode arrays are positioned nested relative to one another in the body structure.
  • the medical device or system is configured to report substantially real-time values of spinal cord autoregulation.
  • the medical device further comprises a position tracking system that tracks angular and torsional deflection of one or more of the subassemblies when the subassemblies are positioned within communication of the target location of the subject.
  • the imaging array comprises an ultrasound device.
  • the imaging array is configured to perform elastography (i.e., detecting vibration propagated through, or otherwise mapping the elasticity of, selected tissues of the subject using shear waves or the like).
  • ultrasound imaging arrays use a rectangular, square, or trapezoidal shaped region of interest (ROI) that is specified by a user.
  • the ROI is substantially static or fixed.
  • the body structure comprises at least one substantially rigid section and at least one substantially flexible section.
  • the substantially rigid section comprises at least one of the subassemblies.
  • the body structure comprises a length of less than about 100 millimeters, a width of less than about 10 millimeters, and a depth of less than about 5 millimeters.
  • the body structure is implantable in the subject. In some embodiments, the body structure is non-implantable in the subject. In some of these embodiments, a wearable device comprises the non-implantable body structure. In some embodiments, at least a first device component (e.g., one or more of the subassemblies) that is implantable and at least a second device component (e.g., one or more of the subassemblies) that is non-implantable. Exemplary wearable devices include smart watches, smart clothing or textiles, virtual reality headsets, or the like.
  • the subassemblies are operably connectable to the power source and/or to the controller via a wired connection. In some embodiments, the subassemblies are operably connectable to the power source and/or to the controller via a wireless connection. In some of these embodiments, the body structure comprises at least a portion of the power source and/or the controller.
  • the medical device includes at least two imaging arrays in which at least a first imaging array is configured to be positioned within communication of an uninjured site of the subject and at least a second imaging array is configured to be positioned within communication of an injured site of the subject.
  • the medical device includes at least two stimulation arrays.
  • the medical device includes at least two electrode arrays.
  • the imaging array comprises at least one transmit (Tx) electrode and/or at least one receive (Rx) electrode.
  • the imaging comprises an Rx electrode that is used to monitor the pulsatility of a spinal cord, liver, or other tissue of the subject.
  • the medical device includes at least one wearable device comprising at least one breakout box that is operably connected, or connectable, to the medical device at least when the subassemblies are positioned within communication of the target location of the subject.
  • the breakout box is configured to receive data from the medical device and/or to transmit data to the medical device.
  • the wearable device comprises a belt.
  • the imaging array is configured to image a cross section of the target location of the subject in at least one plane (e.g., two planes, three planes, etc.) when the imaging array is positioned within communication of the target location of the subject.
  • the imaging array is configured to provide planar ultrasound images of micro-vasculature of a spinal cord or other tissue of the subject.
  • the imaging array comprises a lens, an imaging stack, a flexible circuit, and an acoustic impedance backing material.
  • the imaging array comprises at least about 64 elements.
  • the imaging array comprises of 1024 by 1024 array elements on a flexible surface.
  • the imaging array comprises only a single element, whereas in other embodiments the imaging array comprises, for example, a 1D, 1.5D, 2D, 2.5D, 3D, 3.5D, 4D, or other array configuration.
  • the stimulation array is configured to administer focused ultrasound (FUS) and/or flashlight therapeutic ultrasound at least proximal to the target location of the subject when the stimulation array is positioned within communication of the target location of the subject.
  • the stimulation array is structured to administer ultrasonic stimulation at least proximal to the target location of the subject and the electrode array is structured to administer electrical stimulation at least proximal to the target location of the subject when the stimulation array and the electrode array are positioned within communication of the target location of the subject.
  • the stimulation array comprises an air backed array, at least eight element stack, a matching layer, and a dielectric layer.
  • the stimulation array comprises only a single element, whereas in other embodiments the stimulation array comprises, for example, a 1D, 1.5D, 2D, 2.5D, 3D, 3.5D, 4D, or other array configuration.
  • the stimulation array comprises a piezo-ceramic (e.g., PZT), polymer (e.g., PVDF or PLLA), micro-electromechanical system (MEMS) based capacitive micromachined ultrasonic transducers (CMUT) and/or composite material.
  • PZT piezo-ceramic
  • polymer e.g., PVDF or PLLA
  • MEMS micro-electromechanical system
  • CMUT capacitive micromachined ultrasonic transducers
  • the electrode array is further configured to effect data recording at least proximal to the target location of the subject when the electrode array is positioned within communication of the target location of the subject.
  • the electrode array comprises a titanium nitride electrode surface conductor.
  • the electrode array comprises a multi-layer polyimide/copper circuit having independent layers for transmit and receive modalities.
  • the target location comprises at least a portion of a spinal cord of the subject.
  • the target location comprises at least a portion an organ system of the subject selected from the group consisting of: an integumentary system, a skeletal system, a muscular system, a lymphatic system, a respiratory system, a digestive system, a nervous system, an endocrine system, a cardiovascular system, a urinary system, and a reproductive system.
  • the subject is a human or other mammalian subject.
  • the organ system comprises a brain of the subject, whereas in other embodiments, the organ system comprises a liver of the subject.
  • FIG. 1 schematically depicts a system according to an exemplary embodiment.
  • FIG. 2 schematically shows a wearable device according to one exemplary embodiment.
  • FIG. 3 schematically shows an implantable device according to one exemplary embodiment.
  • FIG. 4 schematically shows a control device according to one exemplary embodiment.
  • FIG. 5 is a schematic diagram of an exemplary system suitable for use with certain aspects disclosed herein.
  • FIGS. 6 A-D schematically show a MUSIC device from various views according to an exemplary embodiment.
  • FIG. 6 A shows the MUSIC device from a perspective view.
  • FIG. 6 B shows the MUSIC device from a top view.
  • FIG. 6 C shows the MUSIC device positioned relative to a spinal cord.
  • FIG. 6 D shows the MUSIC device positioned relative to a spinal cord from a sectional view.
  • FIGS. 7 A and B schematically show the MUSIC device from FIG. 6 A from top and sectional views.
  • FIG. 8 A schematically shows a MUSIC device from a top view according to an exemplary embodiment.
  • FIG. 8 B shows the MUSIC device from FIG. 8 A from a partial sectional view.
  • FIG. 9 A schematically shows an imaging array subassembly from a side view according to an exemplary embodiment.
  • FIG. 9 B shows a detailed view of an imaging transducer from the imaging array subassembly of FIG. 8 A .
  • FIGS. 10 A and B schematically show beam patterns of imaging transducers from the imaging array subassembly of FIG. 8 A from sagittal and transverse planes, respectively.
  • FIG. 11 schematically shows an imaging transducer from the imaging array subassembly of FIG. 8 A .
  • FIG. 12 schematically shows an imaging transducer from the imaging array subassembly of FIG. 8 A from a detailed sectional view.
  • FIG. 13 A schematically shows the stimulation array subassembly of FIG. 8 A from a side view.
  • FIG. 13 B shows a stimulation array from FIG. 13 A from a detailed side view.
  • FIGS. 14 A and B schematically show stimulation array beam patterns within sagittal and transverse planes, respectively.
  • FIG. 15 A schematically shows the stimulation array subassembly of FIG. 8 A from a bottom view.
  • FIGS. 15 B and C show the stimulation array subassembly of FIG. 15 A from sectional views.
  • FIG. 16 schematically shows a stimulation stack and a mitigation layer of the stimulation array subassembly of FIG. 15 A prior to assembly from a perspective view.
  • FIG. 17 schematically shows a stimulation transducer from the stimulation array subassembly of FIG. 8 A .
  • FIG. 18 schematically shows a transmit/receive electrode array of the MUSIC device of FIG. 8 A from a bottom view.
  • FIG. 19 A schematically shows the electrode array subassembly of FIG. 8 A from a sectional view.
  • FIG. 19 B shows the electrode array subassembly of FIG. 8 A from a top view.
  • FIGS. 20 A and B schematically show overmolds used as part of a process to fabricate the MUSIC device of FIG. 8 A from perspective views.
  • FIG. 21 schematically shows a belt used to hold a breakout box in place relative to a subject from a perspective view according to an exemplary embodiment.
  • FIG. 22 schematically shows an interconnect box from a perspective view according to an exemplary embodiment.
  • FIG. 23 schematically shows the belt of FIG. 21 and the interconnect box of FIG. 22 positioned relative to a MUSIC device implanted in a subject from a top view according to an exemplary embodiment.
  • FIG. 24 schematically shows an electrical drive system that includes the MUSIC device of FIG. 8 A from a side view according to an exemplary embodiment.
  • FIG. 25 is a flow chart that schematically shows exemplary method steps of providing medical care to a subject according to some aspects disclosed herein.
  • “about” or “approximately” as applied to one or more values or elements of interest refers to a value or element that is similar to a stated reference value or element.
  • the term “about” or “approximately” refers to a range of values or elements that falls within 25%, 20%, 19%, 18%, 17%, 16%, 15%, 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, or less in either direction (greater than or less than) of the stated reference value or element unless otherwise stated or otherwise evident from the context (except where such number would exceed 100% of a possible value or element).
  • a device imaging array transmits acoustic waves to a target location (e.g., a spinal cord) of a subject and receives acoustic waves that echo back from that target location, such that the imaging array and the target location “acoustically communicate” with one another.
  • a device stimulation array also acoustically communicates with a target location of a subject when it transmits acoustic waves to that location.
  • an electrode array of a device transmits electrical current to a target location of a subject and receives electrical signal from that location, such that the electrode array and the target location “electrically communicate” with one another.
  • subject refers to an animal, such as a mammalian species (e.g., human) or avian (e.g., bird) species. More specifically, a subject can be a vertebrate, e.g., a mammal such as a mouse, a primate, a simian or a human. Animals include farm animals (e.g., production cattle, dairy cattle, poultry, horses, pigs, and the like), sport animals, and companion animals (e.g., pets or support animals). A subject can be a healthy individual, an individual that has or is suspected of having a disease or a predisposition to the disease, or an individual that is in need of therapy or suspected of needing therapy. The terms “individual” or “patient” are intended to be interchangeable with “subject.”
  • system in the context of medical instrumentation refers a group of objects and/or devices that form a network for performing a desired objective.
  • the present disclosure relates, in certain aspects, to medical systems, devices and methods for the monitoring and treatment of injuries, disease, or other conditions in humans or other mammals.
  • the present disclosure relates, in certain aspects, to medical systems, devices and methods for the monitoring and treatment of spinal cord injuries in patients, although the system may be used for other types of injuries such as brain injuries, burn injuries, etc.
  • Embodiments disclosed herein provide a system and corresponding methods that can provide continuous monitoring and stimulation of the spinal cord or area of an injury by utilizing an implantable device implantable near the injury.
  • the implantable device may include a sensor to sense/image the injury and a first condition of the human (or animal) related to the injury.
  • the implantable device may also include a treatment device for treatment of the injury.
  • the system may also include a wearable device configured to be worn by the human or animal.
  • the wearable device may be configured to sense a second condition of the human related to the injury.
  • the system may further include a control device separate from the wearable device and the implantable device.
  • the control device may receive signals from the wearable device and from the implantable device based on the sensed first and second conditions. In response to the signals, the control device may be configured to control the treatment device.
  • the system is configured to monitor and treat spinal cord injuries (SCI), although other types of injuries could be monitored and treated.
  • the implantable device may be configured to be implanted near or proximal to the spinal cord injury or other type of injury to sense conditions of and treat the spinal cord injury or other injury.
  • a system 100 is configured for monitoring and treatment of injuries to a patient's body.
  • the system may include a control device 102 , a wearable device 104 and an implantable device 106 in some embodiments.
  • the control device 102 may be configured to control the system 100 .
  • the control device 102 is connected to the wearable device 104 and to an implantable device 106 .
  • the control device 102 may be connected to the wearable device 104 and to the implantable device 106 by a wired connection, such as by cables, but in certain preferred embodiments the control device 102 may be connected to the wearable device 104 and to the implantable device 106 by a wireless connection, such as Wi-Fi, Bluetooth, etc.
  • the wearable device 104 may be one wearable device or a plurality of wearable devices.
  • the wearable device 104 is configured to be wearable on or in proximity to the patient's or subject's body.
  • the wearable device 104 may be attached by a strap or other means to a portion of the patient's body such as to an arm, a leg, a waist, a neck, groin, etc.
  • the wearable device may be configured to be attached in proximity to a particular portion of the patient's body.
  • the wearable device 104 may be configured to be attached to clothes worn by a person.
  • the wearable device 104 may also be integrated into or attached to another device worn by a person.
  • the wearable device 104 could be configured to attach to a watch, to a belt, to jewelry, to glasses, to undergarment, etc.
  • the system 100 may additionally include a software application running on a device such as an Android tablet with an SCI-specific interface for both a physician and a patient that includes an API, allowing peripherals to use the application to change device settings to support closed-loop control of the therapy.
  • a software application running on a device such as an Android tablet with an SCI-specific interface for both a physician and a patient that includes an API, allowing peripherals to use the application to change device settings to support closed-loop control of the therapy.
  • FIG. 2 illustrates further details of the wearable device 104 .
  • the wearable device may include a sensing device 108 configured to sense conditions of a human related to an injury or other condition.
  • the sensing device 108 may be a sensor, imaging device or other type of sensing device configured to sense a condition of the patient's body related to an injury or other condition.
  • the sensing device 108 in some embodiments, may be configured to sense pulsatility of the spinal cord, blood pressure, temperature, flow rates, perfusion, elasticity, conditions related to a bladder such as pressure and volume, motion of limbs such as an arm or a leg, etc.
  • the sensing device 108 may be any type of sensing device configured to sense a condition of the patient's body related to the injury or other condition.
  • the sensing device may be an imaging device, an ultrasound device, a temperature sensing device, an electromyography (EMG) sensor with accelerometers, etc.
  • EMG electromyography
  • the wearable device 104 is some embodiments may include a treatment device 112 , although other wearable devices 104 may omit the treatment device.
  • the treatment device 112 may be configured to apply a treatment related to the injury.
  • the treatment device may be configured to apply an electrical stimulation or some other type of treatment, as further described herein.
  • the wearable device 104 may include a communications interface 110 for sending signals to the control device 102 and for receiving signals from the control device 102 .
  • the communications interface in some embodiments may be a wireless interface configured to send and receive signals to and from the control device 102 .
  • the signals may be indicative of the sensed conditions of the body related to the injury or other condition.
  • the control device 102 is configured to send and receive signals to the communications interface to control the sensing device 108 of the wearable device 104 and/or to control the treatment device 112 .
  • the control device can be configured to cause the sensing device 108 to be activated to sense conditions and to cause the treatment device 112 to apply treatment to the patient's body.
  • FIG. 3 illustrates the implantable device 106 .
  • the system 100 may include one implantable device or a plurality of implantable devices 106 .
  • the implantable device 106 is configured to be implanted entirely within the patient's body in some embodiments. In some embodiments, only a portion of the implantable device 106 is implanted with the patient's body, as described further herein.
  • the implantable device 106 may include a sensing device 116 (e.g., an imaging array or device), a treatment device 118 (e.g., a stimulation array or device and/or an electrode array or device) and a communications interface 120 .
  • the sensing device 116 may be configured to sense conditions of or related to an injury to a human.
  • the sensing device 116 may be an imaging device, a sensor or another type of sensing device.
  • the sensing device may be an imaging device such as an ultrasound imaging device or other type of imaging device, such as an optical imaging device, a thermal imaging device, of the like.
  • the sensing device 116 may be a sensor configured to sense conditions of a body related to an injury or other condition, such as a pressure sensor, a temperature sensor, a biomarker sensor (such as oxygenation, lactate, etc.), an EMG sensor, etc.
  • FIG. 4 illustrates the control device 400 which may be equivalent to the control device 102 of FIG. 1 .
  • the control device 400 may be a computerized device such as a desktop or laptop computer, a server computer, etc.
  • the control device 400 includes a processor 402 , a memory, storage device, or memory component 404 , and a communications interface 408 .
  • the memory 404 optionally includes volatile and/or nonvolatile memory including, for example, RAM, ROM, and magnetic or optical disks, among others.
  • the control device 400 may also include a display and a user interface (not shown). In certain aspects, the communications interface allows the control device 400 to send a receive signals to and from the implantable device 106 and the wearable device 104 .
  • the control device 400 also includes program product 406 stored in the memory 404 .
  • Exemplary program product or machine readable medium 406 is optionally in the form of microcode, programs, cloud computing format, routines, and/or symbolic languages that provide one or more sets of ordered operations that control the functioning of the hardware and direct its operation.
  • Program product 406 according to an exemplary aspect, also need not reside in its entirety in volatile memory, but can be selectively loaded, as necessary, according to various methodologies.
  • computer-readable medium refers to any medium that participates in providing instructions to a processor for execution.
  • computer-readable medium encompasses distribution media, cloud computing formats, intermediate storage media, execution memory of a computer, and any other medium or device capable of storing program product 406 implementing the functionality or processes of various aspects of the present disclosure, for example, for reading by a computer.
  • a “computer-readable medium” or “machine-readable medium” may take many forms, including but not limited to, non-volatile media, volatile media, and transmission media.
  • Non-volatile media includes, for example, optical or magnetic disks.
  • Volatile media includes dynamic memory, such as the main memory of a given system.
  • Transmission media includes coaxial cables, copper wire and fiber optics, including the wires that comprise a bus. Transmission media can also take the form of acoustic or light waves, such as those generated during radio wave and infrared data communications, among others.
  • Exemplary forms of computer-readable media include a floppy disk, a flexible disk, hard disk, magnetic tape, a flash drive, or any other magnetic medium, a CD-ROM, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a RAM, a PROM, and EPROM, a FLASH-EPROM, any other memory chip or cartridge, a carrier wave, or any other medium from which a computer can read.
  • program product 406 includes non-transitory computer-executable instructions which, when executed by electronic processor 402 perform at least: monitoring and treatment of injuries, diseases, or other conditions in a subject by controlling the implantable device 106 and/or the wearable device 104 .
  • the systems and methods disclosed herein may include machine learning such that the systems can adapt by learning. For example, the system 100 can monitor how a patient reacts to various treatments applied by the implantable device 106 and/or the wearable device 104 and learn how to better apply the treatments to various sensed conditions.
  • FIG. 5 illustrates a system 500 according to a particular embodiment.
  • the system 500 may be configured for monitoring and treatment of a spinal cord injury of a patient, although the system 500 could be used for other types of injuries, such as a brain injury, stroke, PTSD, psychiatric disorders, etc.
  • the system 500 includes a control device 502 , a plurality of implantable devices 504 and 506 , and a plurality of wearable devices 508 , 510 and 512 .
  • One or more of the implantable devices 504 and 506 and the plurality of wearable devices 508 , 510 and 512 could be omitted from the system 500 .
  • the control device 502 may be configured in a same manner as the control device 400 .
  • the wearable device 508 may be a wearable device configured to sense a blood pressure of a human wearing the wearable device.
  • the wearable device is shown wearable over an arm of a human, although the wearable device 508 could be positioned in a different location, such as on a torso, a leg, etc.
  • the wearable device 508 may include a sensing device to sense a blood pressure.
  • the wearable device 508 may be configured to generate signals indicative of the sensed conditions, and to send the signals to the control device 102 .
  • the wearable device 508 may include means to affix to the body, such as a sticky surface, a strap, etc.
  • wearable devices comprise an inflatable balloon membrane or the like.
  • the devices disclosed herein can have essentially any shape, including a circular shape, an oval shape, a square shape, a rectangular shape, and a ring shape, among other shapes.
  • the wearable device 510 may be a wearable device configured to sense a bladder volume and or bladder pressure of a subject wearing the wearable device. In FIG. 5 , the wearable device is shown.
  • the wearable device 510 may include a sensing device to sense a bladder pressure and/or volume.
  • the wearable device 510 may be configured to generate signals indicative of the sensed conditions, and to send the signals to the control device 102 .
  • the wearable device 510 may include means to affix to the body, such as a sticky surface, a strap, etc.
  • wearable devices comprise an inflatable balloon membrane or the like.
  • the wearable device 512 may be an EMG wearable device configured to sense/detect motor functions of a subject wearing the wearable device.
  • the wearable device 512 is shown wearable in a leg area of a subject, although the wearable device 512 could be positioned in a different location.
  • the wearable device 512 may include a sensing device or devices to sense a motor function.
  • the wearable device 512 may be configured to generate signals indicative of the sensed conditions, and to send the signals to the control device 102 .
  • the wearable device 512 may include means to affix to the body, such as a sticky surface, a strap, etc.
  • a plurality of the wearable devices 512 may be utilized.
  • a wearable device could be wearable on each arm and each leg, so that the system could monitor motor function of each arm and leg.
  • the wearable device may include one or a plurality of accelerometers.
  • the accelerometers may be configured to generate signals indicative of a limb's motion in real time.
  • the wearable device may be configured to send such signals to the control device 102 .
  • the implantable device 504 may be a multi-function spinal cord implant (MUSIC).
  • the multi-function spinal cord implant 504 may include one or more imaging or sensing devices and one or more treatment devices.
  • the imaging devices may include an ultrasound imaging array or arrays to generate three-dimensional images of the spinal cord at an injury or other target location and an electrical array or arrays for electrical recording, although other types of imaging or sensing devices could be used.
  • the treatment devices may include an electrical stimulation device or devices for applying electrical stimulation and a focused ultra-sound (FUS) device or devices for applying focused ultra-sound treatment, although other types of treatment devices may be used.
  • FUS focused ultra-sound
  • the multi-function spinal cord implant 504 may be a multimodal, conformal, wireless epidural implant device for use in patients with acute or chronic SCI.
  • the multi-function spinal cord implant 504 may be configured to: (a) produce three-dimensional, real-time, high-resolution imaging at the injury site or other target location to monitor and prevent secondary injury; (b) evaluate and assess the reestablishment of autoregulation to optimize acute intervention; (c) continuously monitoring the perfusion or pulsatility of the spinal cord, as a surrogate for its tissue health; (d) measure biomarkers using aptamers; (e) enhance blood flow and potential neural regeneration as a result of acoustic neuromodulation/focused ultrasound (FUS) at the site of injury; (f) actuate release of encapsulated pharmacotherapeutic agents; (g) measure temperature of spinal cord, using ultrasound thermometry; (h) measure electrical conductivity above and below the site of injury; (i) stimulate and record neurophysiological data with electrodes; and/or the like.
  • the multi-function spinal cord implant 504 may be wirelessly powered from an external “relay station” attached outside the body at the implant site. This facilitates higher power levels without bulky battery implants.
  • the multi-function spinal cord implant 504 communicates with the relay station via a custom ultra-wide-band networking protocol that may support 200 Mbps uplink and 100 Mbps downlink.
  • the relay station may be an 802.11 device that communicates wirelessly with the control device 102 .
  • the multi-function spinal cord implant (MUSIC) 504 may be configured to interface with custom-designed encapsulating hydrogel scaffolds that can be stimulated with focused ultrasound (FUS) to deliver pharmacotherapeutic agents. FUS may also be used to enhance blood flow at the site of the injury or other condition.
  • the multi-function spinal cord implant 504 may be a biocompatible, biodegradable, and/or bioresorbable permanently implantable wireless device.
  • the multi-function spinal cord implant (MUSIC) 504 may be configured to interface with custom-designed hydrogel that can be used to adhere the device to the tissue of interest.
  • the hydrogel may be photocrosslinkable via application of UV light to effect solidification.
  • the multi-function spinal cord implant (MUSIC) 504 may be configured to interface with custom-designed shear-thinning hydrogel that can be used to adhere the device to the tissue of interest, upon application of force to attach to or remove from the tissue of interest.
  • the medical devices disclosed herein e.g., multi-function spinal cord implant (MUSIC) 504 , implantable device 506 , wearable devices 508 , 510 , and 512 , and/or the like
  • MUSIC multi-function spinal cord implant
  • implantable device 506 implantable device 506
  • wearable devices 508 , 510 , and 512 wearable devices 508 , 510 , and 512 , and/or the like
  • MUSIC multi-function spinal cord implant
  • the purpose of the MUSIC device is to continuously monitor both healthy and injured spinal cord tissue, and provide stimulation in a multi-modality, semi-flexible device the size of a BAND-AID®.
  • Continuously monitoring is generally achieved through ultrasonic, photoacoustic or photothermal imaging arrays along the length of the device, two poised near the injury site, and one at an uninjured site in some embodiment. These are used for real-time and continuous perfusion quantification, monitoring the pulsatility of the spinal cord, and imaging at the injury site.
  • Stimulation is achieved through both ultrasonic and electrical modalities.
  • Ultrasonic stimulation is achieved through two transmit-only arrays located around the injury site. These arrays allow for steering the ultrasonic energy deep inside the tissue of the spinal cord injury site.
  • Electrical stimulation and recording is achieved through electrodes placed along the length of the device in these exemplary embodiments.
  • the MUSIC device includes a body structure that comprises at least portions of at least three subassemblies.
  • the subassemblies include at least one imaging array or device (e.g., used to record biological response), at least one stimulation array or device (e.g., used to provide ultrasound stimulation), and at least one electrode array or device (e.g., used to provide SCS based stimulation and recording).
  • the subassemblies are positionable within communication of a spinal injury of a subject.
  • the imaging array is structured to generate and/or capture images (e.g., still, HD live images, and/or video images) proximal to the target location of the subject when the imaging array is positioned within communication of the spinal injury of the subject.
  • the stimulation array is structured to administer a first therapy (e.g., FUS, etc.) proximal to the spinal injury of the subject when the stimulation array is positioned within communication of the spinal injury of the subject.
  • the electrode array e.g., electrical stimulation and recording electrodes
  • a second therapy e.g., electrical current, etc.
  • the subassemblies are operably connected, or connectable, to at least one power source and/or at least one controller (e.g., as part of a stand-alone system or as part of a larger system, such as system 500 ).
  • FIGS. 6 A-D and 7 A and B show a MUSIC device from various views according to an exemplary embodiment.
  • the MUSIC device 600 includes a body structure 601 , which includes imaging array 602 and stimulation array 604 .
  • FIGS. 6 C and D shows the MUSIC device 600 positioned relative to a spinal cord 610 as well as an imaging plane 606 and a therapy area 608 .
  • the body structure 601 also includes substantially rigid sections 612 and substantially flexible sections 614 .
  • subassemblies i.e., imaging array 602 and stimulation array 604
  • the body structure 601 comprises a length of less than about 100 millimeters (e.g., about 75 mm, about 50 mm, about 25 mm, or less), a width of less than about 10 millimeters (e.g., about 9 mm, about 8 mm, about 7 mm, about 6 mm, about 7 mm, or less), and a depth of less than about 5 millimeters (e.g., about 4 mm, about 3 mm, about 2 mm, about 1 mm, or less).
  • the MUSIC device body structure comprises a form-factor about the size of a BAND-AID®.
  • the overall dimensions of the MUSIC device are 39 mm length, 9.7 mm width, and 2.4 mm height.
  • FIG. 8 A shows a MUSIC device 800 from a top view according to an exemplary embodiment.
  • FIG. 8 B shows the MUSIC device 800 from FIG. 8 A from a partial sectional side view.
  • the MUSIC device 800 includes a body structure 802 , which includes healthy site imaging array or transducer 804 , injured site imaging arrays or transducers 806 , stimulation arrays 808 (e.g., an ultrasonic stimulation array), and electrode arrays 810 disposed in rigid sections of the body structure 802 . In some embodiments, these subassemblies are disposed in flexible sections of device body structures.
  • MUSIC devices are typically operably connected to a position tracking system that tracks angular and torsional deflection to accurately control, for example, the ultrasonic stimulation.
  • subassemblies of MUSIC devices are operably connected to power sources via flexible and/or rigid circuits.
  • the stimulation arrays 808 have a spatial frequency of half lambda. This allows the beam to radiate with very little directivity within the sagittal plane, which allows for the focus to move throughout a large volume in front of the arrays through applying time delay or phasing to the signals. In some embodiments, there is effectively a 1 to 1 relationship from the radiating surface to the focal zone of the device. In some embodiments, the beam can then be swept around to cover the volume in front of the arrays with a collimating beam if subsequent focal positions are time averaged. Typically, the stimulation arrays 808 provide coverage from about 4 mm to about 12 mm in depth.
  • the MUSIC device is inserted through the skin of a patient and is positioned alongside the spine.
  • the implanted end of the device is typically encapsulated, providing a smooth gap free surface to minimize tissue response of the device.
  • an over-mold extends outside of the surgical incision before transitioning to a bare flex circuit.
  • the flex circuit is typically a multi-layer assembly. In some embodiments, the entire length of flex circuit is over-molded, whereas a disposable sleeve is used in other embodiments.
  • one or more components of the MUSIC device are fabricated from, for example, a conformal coating (e.g., parylene), an elastic epoxy, a rigid epoxy/urethane, silicone (e.g., stimulation lens), ULTEM® 1000 resin (e.g., imaging lens), polyimide (PI), and the like.
  • a conformal coating e.g., parylene
  • an elastic epoxy e.g., parylene
  • silicone e.g., stimulation lens
  • ULTEM® 1000 resin e.g., imaging lens
  • PI polyimide
  • FIG. 9 A schematically shows an imaging array subassembly from a side view according to an exemplary embodiment.
  • the imaging array subassembly includes imaging transducer 804 and injured site imaging transducers 806 operably connected to a power source (not shown) via flex circuit 805 .
  • FIG. 9 B shows a detailed view of imaging transducer 804 from the imaging array subassembly of FIG. 8 A , which is representative of each of the three transducers depicted in FIG. 9 A .
  • imaging transducer 804 includes a piezo element array with a silicone lens 814 to focus the ultrasound beam.
  • a flex circuit 805 attaches to the rear of the imaging stack 816 (e.g., a 64-element beam mode-composite matching layer) and provides full aperture connection with limited crosstalk. Behind the flex circuit is a damping backing material 812 (e.g., a high acoustic impedance backing material) to introduce a large bandwidth to the array which helps with axial resolution.
  • a damping backing material 812 e.g., a high acoustic impedance backing material
  • FIGS. 10 A and B schematically show beam patterns of imaging transducers ( 804 and 806 ) from the imaging array subassembly of FIG. 8 A from sagittal and transverse planes, respectively.
  • the imaging array subassembly is configured for imaging within about 4 to about 14 mm from the face of the probe through both their size, number of array elements, and through an acoustic lens.
  • the lens mainly affects the beam shape within the sagittal plane and is fixed due to the geometry of the acoustic lens.
  • the beam can be electronically focused, which can, for example, improve B mode image clarity or achieve fast frame rates for doppler. This electronic focusing can lead to non-trivial beam forming by design on the tissue of interest, without any mechanical movement of the MUSIC implant.
  • the geometry of the imaging array subassembly maximizes the total number of elements while maintaining acoustic imaging characteristics.
  • a width in elevation of about 2.000 mm provides a balance of sensitivity and acoustic performance in some embodiments.
  • an aspect ratio (width/thickness) of the individual beam-mode elements of about 0.87 is used to minimize mode structures in the piezoceramic.
  • a pitch of about 135 microns and kerf width of 24 microns is used for the dicing parameters. After the array is machined, the kerfs cuts are filled with a specialized epoxy that aids in minimizing the effects of cross-talk between adjacent elements in some of these embodiments.
  • FIG. 11 schematically shows an imaging transducer 806 from the imaging array subassembly of FIG. 8 A .
  • the imaging transducer 806 comprises a piezoelectric material that is about 50 microns thick so as to provide a suitable frequency band of interest. Based on the dielectric strength of the 50-micron thick piezoelectric material, a withstanding voltage limit is about 20 Vp in these embodiments.
  • FIG. 12 schematically shows an imaging transducer from the imaging array subassembly of FIG. 8 A from a detailed sectional view.
  • the uppermost layer that is in contact with the tissue of a patient is the elevation focusing lens 832 (e.g., a silicone acoustic lens).
  • the lens typically has several purposes, including to: 1) bring the natural focus inward within the near field to improve spatial resolution within the axial range of interest, 2) provide the optimal acoustic properties between the piezoelectric stack and the patient, 3) contribute as an electrical dielectric for shock protection, 4) encapsulate and keep the active array hermetically sealed, 5) act as a biocompatible (or biodegradable) layer to the patient, and 6) to provide an adequate coupling geometry to the patient's entry plane.
  • a second layer 830 is a quarter-wave matching layer with an acoustic impedance of about 5 MRayls in some embodiments. Besides the piezocomposite itself, the matching layer is typically the largest contributor in increasing the overall bandwidth of the imaging array.
  • a third layer 826 is the piezocomposite, constructed with about a 50-micron thickness using PZT-5H beam-mode.
  • the front of this layer is typically mechanically bonded to the front 1 ⁇ 4 wave matching layer 830 and the rear is mechanically bonded to the rear flex circuit 822 (e.g., a dual-layer Cu/polymide signal/shield flex circuit).
  • the piezocomposite typically has an acoustic impedance of 30 Mrayls, dielectric constant 1,475 E33s and coupling coefficient (kt) 0.7.
  • the material is sub-diced to two 44-micron width beams and combined into a channel pitch of 135 microns (lambda pitch at 11 MHz) in some embodiments.
  • a fourth layer is the flex circuit 822 , with copper sputtered polyimide 824 , which acts as the first backing layer.
  • a fifth layer is the rear acoustic backing 820 , with an impedance of 4.2 Mrayls in some embodiments. This layer helps to dampen the stack and reduce echo reflections.
  • the overall imaging transducer height is within about 1.5 mm.
  • the imaging transducer also includes a polymide ground (GND) return flex circuit 834 and a V( ⁇ ) electrode GND return 828 .
  • GND polymide ground
  • FIG. 13 A schematically shows the stimulation array subassembly of FIG. 8 A from a side view.
  • FIG. 13 B shows a stimulation array from FIG. 13 A from a detailed side view.
  • the stimulation array 808 utilizes a diced piezo-ceramic material.
  • the front 844 is covered with a dielectric material for isolation and a bifurcated flex circuit 838 provides connection to the 8-element stack 840 .
  • the rear of the transducer includes an air-backed array 836 to optimize efficiency.
  • the stimulation array 808 also includes a matching layer 842 .
  • FIGS. 14 A and B show stimulation array beam patterns of the MUSIC device 800 within sagittal and transverse planes, respectively.
  • the stimulation array 808 allows steering within the sagittal plane in the horizontal and vertical directions. On the transverse plane, the beam pattern can be steered up or down.
  • the beam pattern is typically highly diffused, with the local maxima found outside of the plane of symmetry where the sagittal view intersects.
  • the stimulation beam pattern has coverage all the way to the face of the imaging arrays 806 .
  • FIG. 15 A schematically shows the stimulation array subassembly of FIG. 8 A from a bottom view.
  • FIGS. 15 B and C show the stimulation array subassembly of FIG. 15 A from sectional views.
  • FIG. 16 schematically shows a stimulation stack 840 and a mitigation or matching layer 842 of the stimulation array subassembly of FIG. 15 A prior to assembly from a perspective view.
  • the polyimide mitigation layer 842 is typically bonded to the surface of the imaging stack 840 .
  • FIG. 17 schematically shows a stimulation transducer 808 from the stimulation array subassembly of FIG. 8 A .
  • FIG. 18 schematically shows a transmit/receive electrode array of the MUSIC device of FIG. 8 A from a bottom view.
  • an electrode transmit/receive array is incorporated in the MUSIC device to provide electrical stimulation directly at the site of spinal trauma.
  • the electrode array utilizes a pattern of titanium nitride electrodes with two different geometries: ellipses with high-surface area for transmitting current (electrodes 850 ), and smaller circular electrodes 852 for the recording of electrical signals.
  • titanium nitride is used for the surface conductor of the electrodes because it doesn't chemically dissociate after implantation unlike other non-biocompatible electrode materials.
  • FIG. 19 A schematically shows the electrode array subassembly of FIG. 8 A from a sectional view.
  • FIG. 19 B shows the electrode array subassembly of FIG. 8 A from a top view.
  • the pattern of electrodes uses a subassembly made from dual-layer polyimide/copper flex circuits 860 that run the length of the encapsulated MUSIC device.
  • Cavity 858 is to accommodate flex circuits of stimulation or treatment arrays 866 and imaging arrays 868 .
  • the exemplary design incorporates treatment (transmit (Tx) electrodes 854 ) and recording (receive (Rx) electrodes 856 ) electrodes along branching arms of the flex circuit which are subsequently wrapped around to the face of the device.
  • the extensions 862 supporting the electrodes not only allow for direct electrical stimulation of the spinal cord without blocking the acoustic energy emanating from the treatment and imaging arrays, but also serve as a skeletal framework for the device prior to encapsulation.
  • External bend radius 864 e.g., about 2.4 mm in some embodiments is also shown.
  • FIGS. 20 A and B schematically show overmolds used as part of a process to fabricate the MUSIC device 800 of FIG. 8 A from perspective views.
  • casting involves a low-pressure molding technique that is often used with two-part epoxies that are then cured.
  • a basic mold is formed using two halves that are clamped together forming a cavity. This can be filled by gravity or a vacuum can be used to assist the fill. This is typically dependent on the complexity of the inserted parts or the viscosity of the casting material.
  • the flex assembly is located into the mold (elements 2002 and 2004 ) with alignment tabs provided on the device in some embodiments.
  • the mold can be closed and clamped shut.
  • the casting material can be injected into the tool. Once the part has cured, it can be removed from the mold and processed for the next shot. In some embodiments, the alignment tabs are removed from the flex at this point.
  • the second shot of this exemplary embodiment fully encapsulates the device with the casting material. It locates in the mold (elements 2006 and 2008 ) from the features formed during the first shot. Processing the final cast part typically includes removing all gates and flash from the part as well as any masking.
  • disposable sheaths are used to cover the length of the flex outside of the surgical implant. These sheaths help to mitigate mechanical abrasion due to sharp edges on the flex in some embodiments.
  • FIG. 21 schematically shows a belt 2100 used to hold a breakout or interconnect box (not shown in FIG. 21 ) in place relative to a subject from a perspective view according to an exemplary embodiment.
  • the belt 2100 for this device typically holds the breakout or interconnect box in place during treatment, without placing additional stress on the treatment area.
  • the belt 2100 is made of synthetic rubber (i.e., it is latex free).
  • the belt 2100 includes an airplane style buckle to secure the device in place.
  • belt 2100 is used to not only to hold the breakout or interconnect box in a selected position, but also hold and position other components, such as the bladder monitoring wearable 510 depicted in FIG. 5 .
  • FIG. 22 schematically shows an interconnect or breakout box 2200 from a perspective view according to an exemplary embodiment.
  • the primary purpose of the breakout box 2200 in this system is typically to transition the flex circuit cable to a robust micro coax cable for device operation.
  • This micro coax cable is typically detachable at the breakout box interface and allows the MUSIC device to stay securely implanted throughout the procedure, regardless of strain at the cable interface.
  • FIG. 23 schematically shows the belt 2100 of FIG. 21 and the interconnect or breakout box 2200 of FIG. 22 positioned relative to a MUSIC device 800 implanted in a subject 2300 from a top view according to an exemplary embodiment.
  • the belt 2100 secures the interconnect or breakout box 2200 at the pelvis of the subject 2300 .
  • FIG. 24 schematically shows an electrical drive system 2400 that includes the MUSIC device 800 of FIG. 8 A from a side view according to an exemplary embodiment.
  • the main components of the electrical drive system 2400 are the MUSIC device 800 , the belt 2100 , a breakout box (BOB) 2402 , and an ultrasound system 2404 (e.g., a Verasonics Vantage platform, or customized back-end driver electronics).
  • the connections include imaging RF connections (e.g., 64 imaging channels per array, adding up to 192 channels of the 256 total available) and stimulation RF connections (e.g., 16 total (2 ⁇ 8) channels on the transmit array which brings the total to 208 channels for ultrasound).
  • 1024 channels are utilized to drive both the diagnostic and therapeutic aspects of the MUSIC device.
  • the connection between the belt 2100 and the ultrasound system 2404 is typically detachable, to allow for the patient to decouple from the system, and maintain strain relief on the MUSIC device 800 .
  • the implantable device 506 may be a cerebrospinal fluid (CSF) management implant, also referred to as an acute CSF management implant (ACMI), 506 , although other type of implantable devices could be used.
  • CSF cerebrospinal fluid
  • ACMI acute CSF management implant
  • the ACMI 506 may be a smart spinal fluid drainage catheter.
  • the ACMI 506 may be configured to drain CSF while simultaneously using fiber optics technology to sense biomarkers such as intrathecal pressure, temperature, oxygenation, lactate, glutamate, cytochrome C, L-citrulline, S100b, IL-6, GFAP, bilirubin, ascorbate, or a combination thereof.
  • ACMI 506 may include one or a plurality of sensors.
  • the sensors may be configured to sense/detect temperature, pressure, and biomarkers.
  • the ACMI 506 may be configured to include optical sensors for measuring intrathecal pressure and temperature.
  • ACMI 506 may include sensors such as a fiber-optic, spectroscopy system that monitors spinal cord oxygenation by providing nearly continuous CSF concentration measurements of oxygenation indicators, such as lactate.
  • ACMI 506 may include a drainage catheter to remove spinal fluid to adjust intraspinal pressure. In some embodiments, ACMI 506 measuring and managing CSF pressure throughout the acute phase of neurological injury.
  • an epidural spinal stimulator (ESS) device may be utilized with the system 500 , an epidural spinal stimulator (ESS) device.
  • the ESS device may be a biocompatible epidural implant.
  • the ESS implantable device may be placed at the lumbosacral level (L1-S2), in the post-acute period of injury.
  • the ESS device may be configured with electrodes configured to apply electrical stimulation of the spinal cord, particularly of the dorsal lumbosacral spinal cord.
  • Dorsal epidural electrical stimulation does not induce movement by directly activating motor pools. Instead, it enables motor function by (1) stimulating medium- and large-diameter afferent fibers in lumbar and upper sacral posterior roots that transmit proprioceptive information from muscle spindle primary endings in the legs to the spinal cord and trans-synaptically engaging interneurons that integrate the proprioceptive inputs and central pattern generator networks.
  • Epidural electrical stimulation modulates spinal circuits into a physiological state that allows for task-specific sensory input derived from movements to serve as a source of motor control.
  • motor outputs of the stimulation provided by the ESS device can be monitored and characterized by an accelerometer as well as by EMG potentials in target muscles.
  • the EMG wearable device 512 may be used in conjunction with the ESS device in a manner that when the ESS device applies electrical stimulation, the EMG device monitors and generates signals indicative of the movement of the limbs of a human.
  • properties of the signals generated by the EMG wearable device such as latencies and peak-to-peak amplitudes, will be fed back to the epidural stimulation console to provide real-time information on locomotor output that are used to dynamically modulate and optimize stimulation parameters.
  • the ESS device may be configured to provide extremely fine temporal resolution (i.e., time resolution of 10 ⁇ s), increased independent rate options for programs providing therapy simultaneously, and independent amplitude control on each active electrode.
  • the control device 102 may be configured with an ESS application programming interface (API), may be configured to wirelessly adjust the stimulation provided by the ESS device, at a rate of, for example, up to six times per second.
  • API ESS application programming interface
  • the ESS device is configured to be used to restore complex motor, bladder, and CV control.
  • the ESS device is configured to be used to along with the other elements of the system 100 to restore complex motor, bladder, and CV control to an individual with a SCI.
  • the control device can receive signals from the sensor devices to continuously monitor motor, bladder, and CV control in response thereto.
  • the ESS device can using a MICS band/Bluetooth relay, with USB or Bluetooth connection to the control device 102 .
  • MICS band communication will allow the control device to be several feet away from the patient while still providing therapy in a closed-loop manner through distance telemetry.
  • the ESS device is configured to be implanted subcutaneously in the abdomen, flank, or upper buttock area, but could be implanted elsewhere. consists of a hermetic titanium enclosure housing stimulation and telemetry electronics with a battery. In some embodiments, the ESS device is configured to be used to stimulate the lumbar area of the spinal cord to provide SCI therapy.
  • the system 100 , 500 may be used to treat and monitor an individual with a SCI.
  • an individual with a SCI such as a severe thoracic SCI, can have the ACMI device 506 implanted at subarachnoid space, and the MUSIC device 504 implanted epidurally at the site of the injury.
  • the ACMI device 506 is used for selectively draining CSF based on sensed feedback from its sensors.
  • the sensors the ACMI device may be configured to sense intrathecal pressure, oxygenation, lactate, and temperature, and feed signals indicative of the sensed conditions to the control device 102 .
  • the control device can control the ACMI device 506 to then selectively draining CSF based on analyzing the signals.
  • the MUSIC device 504 utilizes its ultrasound and/or electrical imaging sensors to generate three-dimensional, real-time, high-resolution imaging at the injury site to continuously monitor and prevent secondary injury, and to selectively provide acoustic neuromodulation and/or focused ultrasound (FUS) at the site of injury or other condition.
  • the MUSIC device 504 may be configured to generate signals/images based on conditions sensed by its sensors, and to send those signals to the control device 102 .
  • the control device 102 may be configures to selectively provide acoustic neuromodulation and/or focused ultrasound based on analyzing the received signals.
  • the ESS device may be implanted, and the wearable devices 104 may be worn and utilized with the system 100 , 500 .
  • the ESS device may be configured to selectively apply electrical stimulation of the dorsal lumbosacral spinal cord based on sensed conditions from any of the wearable devices 104 or the implantable devices 106 .
  • the system 100 , 500 includes software programs (algorithms) as program product 406 that include a machine-learning modelling framework. All sensed data may be loaded to a persistent datastore.
  • the data in the datastore is used with a real-time implementation of a multimodal time-series classification network built on efficient implementations of deep convolutional neural networks for processing multi-scale spatiotemporal representations.
  • the networks are trained to predict optimal interventions (e.g., stimulation with electrodes, ultrasound, and drug delivery) based on simultaneous analysis of the MUSIC implant's electrode array, ultrasound measurements, and ACMI biomarker inputs, for example.
  • Regression models based on deep features extracted from ultrasound using convolutional neural networks can be used to estimate bladder state and blood pressure.
  • the algorithms are trained and deployed to predict improved stimulation patterns from multimodal inputs.
  • the present disclosure also provides various systems and computer program products or machine readable media.
  • the methods described herein are optionally performed or facilitated at least in part using systems, distributed computing hardware and applications (e.g., cloud computing services), electronic communication networks, communication interfaces, computer program products, machine readable media, electronic storage media, software (e.g., machine-executable code or logic instructions) and/or the like.
  • memory 404 of the control device 400 optionally includes volatile and/or nonvolatile memory including, for example, RAM, ROM, and magnetic or optical disks, among others. It is also understood by those of ordinary skill in the art that although illustrated as a control device, the illustrated configuration of control device 400 is given only by way of example and that other types of servers or computers configured according to various other methodologies or architectures can also be used. As also understood by those of ordinary skill in the art, the control device 400 , for example, can be a laptop, desktop, tablet, personal digital assistant (PDA), cell phone, server, or other types of computers.
  • PDA personal digital assistant
  • exemplary program product or machine readable medium 406 is optionally in the form of microcode, programs, cloud computing format, routines, and/or symbolic languages that provide one or more sets of ordered operations that control the functioning of the hardware and direct its operation.
  • Program product 406 according to an exemplary aspect, also need not reside in its entirety in volatile memory, but can be selectively loaded, as necessary, according to various methodologies as known and understood by those of ordinary skill in the art.
  • Program product 406 is optionally copied from the computer-readable medium to a hard disk or a similar intermediate storage medium.
  • program product 406 or portions thereof, are to be run, it is optionally loaded from their distribution medium, their intermediate storage medium, or the like into the execution memory of one or more computers, configuring the computer(s) to act in accordance with the functionality or method of various aspects. All such operations are well known to those of ordinary skill in the art of, for example, computer systems.
  • this application provides systems that include one or more processors, and one or more memory components in communication with the processor.
  • the memory component typically includes one or more instructions that, when executed, cause the processor to provide information that causes at least one result, data, and/or the like to be displayed or otherwise indicated (e.g., via a result indicator of control device 400 ) and/or receive information from other system components and/or from a system user (e.g., via communication interface 408 or the like).
  • program product 406 includes non-transitory computer-executable instructions which, when executed by electronic processor 402 perform at least execution of algorithms contained in the computer program product 406 configured to perform the functionality described herein.
  • an exemplary computer readable media includes non-transitory computer executable instruction which, when executed by an electronic processor perform at least: generating and/or capturing images proximal to a target location (e.g., a spinal cord injury) of a subject using an imaging array of the MUSIC device 504 that comprises a body structure that comprises the imaging/sensing array; administering a first therapy (e.g., FUS) proximal to the target location of the subject using a stimulation array of the MUSIC device 504 ; and administering a second therapy (e.g., an electrical current) proximal to the target location of the subject using an electrode array of MUSIC device 504 .
  • a first therapy e.g., FUS
  • a second therapy e.g., an electrical current
  • FIG. 25 is a flow chart that schematically shows exemplary method steps of providing medical care to a subject according to some aspects disclosed herein.
  • method 2500 includes generating and/or capturing images at least proximal to a target location of the subject using at least one imaging array of a medical device (e.g., using a MUSIC device) that comprises a body structure that comprises at least portions of the imaging array (step 2502 ).
  • Method 2500 also includes administering at least a first therapy (e.g., FUS, etc.) at least proximal to the target location of the subject using at least one stimulation array of the medical device that comprises the body structure that comprises at least portions of the stimulation array (step 2504 ).
  • a first therapy e.g., FUS, etc.
  • method 2500 also includes administering at least a second therapy (e.g., an electrical current, etc.) at least proximal to the target location of the subject using at least one electrode array of the medical device that comprises the body structure that comprises at least portions of the electrode array (step 2506 ).
  • a second therapy e.g., an electrical current, etc.
  • the device is placed on a sticky gel that due its stickiness allows for proper contact and retention between the tissue (e.g., skin, etc.) and the device (e.g., via negative pressure).
  • this gel is made out of both biocompatible and sonolucent materials. The materials have acoustic properties (e.g. speed of sound and attenuation) that allow for passage of ultrasonic waves without production of non-desirable echoes.
  • this gel can be a hydrogel (e.g., a photocrosslinkable gel).
  • this gel can be a shear-thinning material (STM) and/or shear-thinning biomaterial (STB).
  • STM shear-thinning material
  • STB shear-thinning biomaterial
  • an STM/STB is placed on the spinal cord dura mater (or the skin, in the case of the wearables) and when the device is pressed into place, the STM/STB liquefies just enough to accommodate the device and establish appropriate contact with the body, after which point, the gel solidifies and the device maintains its intended placement.
  • an implantable MUSIC device In the case of an implantable MUSIC device, it can be held in place, through commercial or customized surgical toolkits or attachment mechanisms, such as the use of sutures, screws, rods, cages, rails or other metal (or non-metal) implants that can provide the positive pressure to ensure the device is properly placed on and in contact with the body of a patient.
  • surgical toolkits or attachment mechanisms such as the use of sutures, screws, rods, cages, rails or other metal (or non-metal) implants that can provide the positive pressure to ensure the device is properly placed on and in contact with the body of a patient.

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US18/247,760 Pending US20230363711A1 (en) 2020-10-06 2021-10-06 Monitoring and treatment of injuries using wearable devices
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US20230363711A1 (en) 2023-11-16

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