Abstract: A wearable paper-based platform with simultaneous passive and active feedback for monitoring perspiration is provided. The sensor platform comprises two modules: a disposable wicking-based sweat collection patch with discrete colorimetric feedback, and a reusable electronic detachable module for active feedback. The disposable patch comprises a hygroscopic wicking material laminated between two polymeric films. The wicking material is patterned with a radial finger design that offers discretized visual readout of the sensor. The active module attaches to the film and alerts the user when the film collects a pre-determined volume of sweat. The multi-feedback system allows high-performance athletes who value objective quantification of perspiration to better assess their sweat loss during physical activities.

Abstract: A method of making a sensor includes depositing a layer of hydrogel over a substrate, the hydrogel configured to change thickness or volume in response to a selected condition and including a plurality of magnetic particles disposed in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel. The hydrogel is sacrificed in selected region(s) of the layer so that the hydrogel outside the selected region(s) forms a plurality of spaced-apart islands of the hydrogel. The islands of the hydrogel are enclosed in an enclosure at least partly permeable to a selected fluid. A sensor for detecting a condition includes the substrate, islands, and a device coil arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor. A system includes the substrate, islands, and a magnetic-field detector.

Abstract: An implantable pressure sensor arrangement is disclosed. The arrangement includes a substrate, a coil positioned on the substrate, a flexible membrane positioned proximate to the coil and configured to be moveable with respect to the coil, thereby forming a fluid chamber, fluidly sealed from outside of the implantable pressure sensor arrangement, a porous membrane positioned on the flexible membrane and configured to transfer pressure from outside of the implantable pressure sensor arrangement onto the flexible membrane wherein a differential pressure is generated on the two sides of the flexible membrane thereby causing the flexible membrane to deflect towards and away from the coil, and an electrode coupled to the flexible membrane.

Abstract: A method for acquiring gait parameters of an individual is disclosed. The method includes capturing calibration images from foot marker placed on feet or shoes of an individual while an individual is standing still, the calibration images are obtained from a camera worn by the individual, capturing subsequent time-varying images from the foot markers while the individual is walking, and comparing the calibration images to the subsequent time-varying images by a processing unit that is coupled to the camera to determine changes between the initial relative image size of the foot markers and the time-varying images of the foot markers as a function of time to analyze gait of the individual.

Abstract: A method for acquiring gait parameters of an individual is disclosed. The method includes capturing calibration images from foot marker placed on feet or shoes of an individual while an individual is standing still, the calibration images are obtained from a camera worn by the individual, capturing subsequent time-varying images from the foot markers while the individual is walking, and comparing the calibration images to the subsequent time-varying images by a processing unit that is coupled to the camera to determine changes between the initial relative image size of the foot markers and the time-varying images of the foot markers as a function of time to analyze gait of the individual.

Abstract: A sensor for detecting a condition includes a hydrogel configured to change thickness or volume in response to the condition. Magnetic particles are arranged in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel. Some such sensors include a magnetic-field detector that measures the magnetic field of the hydrogel. Other such sensors include a device coil is arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor. A sensing system using such a sensor includes a reader spaced apart from the sensor and including a reader coil and a resonance detector coupled to the reader coil to detect a the resonant frequency of the sensor. Changes in the magnetic property detectably modulate the resonant frequency.

Abstract: A wearable accessory capable of communicating data to actuators or from sensors is disclosed. The wearable accessory includes a conductor wire disposed in a moldable medium according to a predetermined pattern, the moldable medium being an electrically insulating material, the conductor wire terminating at an input and an output.

Abstract: An implantable pressure sensor arrangement is disclosed. The sensor arrangement includes a pressure sensor, a cable having a plurality of conductors coupled to the pressure sensor, a flexible balloon partially fitted around the subassembly, thereby encasing the pressure sensor while each end of the cable is extending away from the balloon, the flexible balloon is then filled with an incompressible fluid, thereby allowing pressure changes outside of the balloon to be sensed by the pressure sensor inside of the balloon.

Abstract: A method of using a AFM/NMR probe, the method comprising the steps of injecting a sample to be analyzed with magnetic particles, introducing a probe into proximity with the sample, the probe capable of both transmitting and sensing electromagnetic radiation; generating a magnetic field via the probe, and adjusting the magnitude of the magnetic field to manipulate the magnetic particles within the sample.

Abstract: Illustrative embodiments of systems and methods for wireless magnetic tracking are disclosed. In one illustrative embodiment, a wireless magnetic tracking system may include a plurality of transmitting coils each configured to generate a magnetic field when energized, an active transponder configured to simultaneously (i) obtain measurements of the magnetic field when one of the plurality of transmitting coils is energized and (ii) transmit a wireless signal containing data concerning the measurements, and a computing device configured to (i) cause each of the plurality of transmitting coils to be sequentially energized, (ii) receive the data concerning the measurements, and (iii) determine a position and an orientation of the active transponder relative to the plurality of transmitting coils in response to the data concerning the measurements.

Abstract: A remotely activatable capsule. The capsule includes a housing that can be swallowed by a subject, an electrical energy reservoir having a first terminal and a second terminal positioned in the housing, a remotely activatable switch positioned in the housing and configured to be remotely activated, and a function-specific mechanism positioned in the housing and electrically coupled to the remotely activatable switch and to the electrical energy reservoir and configured to perform a function when the remotely activatable switch is activated.

Abstract: A micropump device. The micropump device includes a first layer forming a first chamber configured to store a working material, a second chamber defined by a deflectable membrane in fluid communication with the first chamber and configured to deflect in response to a pressure increase in the first chamber in response to a volume increase in the first chamber, the second chamber configured to store a drug compound to be delivered to a subject's vascular system, and at least one needle in fluid communication with the second chamber and configured to penetrate a subject's skin to pump the drug compound in response to the deflection of the deflectable membrane.

Abstract: A platform for oxygen generation and delivery is disclosed. The platform includes a hydrophobic substrate with at least one hydrophilic region permeable to gas flow formed thereon having an oxygen generating compound embedded in the at least one hydrophilic region. The platform further includes a microfluidic network with an inlet and an outlet bonded to the hydrophobic substrate with at least one fluid exchange region fluidly coupled to the inlet and the outlet and substantially matching the least one hydrophilic region. The microfluidic network is configured to receive an oxygen rich fluid at the inlet, communicate the oxygen rich fluid to the at least one fluid exchange region to mix with the oxygen generating compound, causing a chemical reaction resulting in formation of oxygen and a chemical byproduct, and communicate the chemical byproduct to the outlet, where the oxygen is permeated out of the at least one hydrophilic region.

Abstract: A method for acquiring gait parameters of an individual is disclosed. The method includes capturing calibration images from foot marker placed on feet or shoes of an individual while an individual is standing still, the calibration images are obtained from a camera worn by the individual, capturing subsequent time-varying images from the foot markers while the individual is walking, and comparing the calibration images to the subsequent time-varying images by a processing unit that is coupled to the camera to determine changes between the initial relative image size of the foot markers and the time-varying images of the foot markers as a function of time to analyze gait of the individual.

Abstract: A system is provided for monitoring intraocular pressure, the system comprising: a sensor package configured to be disposed in the suprachoroidal space of a patient's eye; a pressure sensor; a wireless transceiver disposed within the sensor package and coupled to the pressure sensor; an external transceiver, the external receiver being wirelessly coupled to the wireless transceiver when the transceiver is disposed proximate to the patient's eye.

Abstract: An implantable oxygen generator system is disclosed. The implantable oxygen generator system includes a receiver configured to generate an electrical current, and an electrode set configured to deliver the electrical current to water molecules of an interstitial fluid within a tissue, wherein the electrical current electrolyzes the water molecules into oxygen molecules.

Abstract: A method of making a sensor includes depositing a layer of hydrogel over a substrate, the hydrogel configured to change thickness or volume in response to a selected condition and including a plurality of magnetic particles disposed in the hydrogel so that a magnetic property of the hydrogel changes with changes of thickness or volume of the hydrogel. The hydrogel is sacrificed in selected region(s) of the layer so that the hydrogel outside the selected region(s) forms a plurality of spaced-apart islands of the hydrogel. The islands of the hydrogel are enclosed in an enclosure at least partly permeable to a selected fluid. A sensor for detecting a condition includes the substrate, islands, and a device coil arranged with respect to the hydrogel so that changes in the magnetic property modulate an electrical property of the sensor. A system includes the substrate, islands, and a magnetic-field detector.

Abstract: A method of using a AFM/NMR probe, the method comprising the steps of injecting a sample to be analyzed with magnetic particles, introducing a probe into proximity with the sample, the probe capable of both transmitting and sensing electromagnetic radiation; generating a magnetic field via the probe, and adjusting the magnitude of the magnetic field to manipulate the magnetic particles within the sample.

Abstract: An implantable pressure sensor arrangement is disclosed. The arrangement includes a substrate, a coil positioned on the substrate, a flexible membrane positioned proximate to the coil and configured to be moveable with respect to the coil, thereby forming a fluid chamber, fluidly sealed from outside of the implantable pressure sensor arrangement, a porous membrane positioned on the flexible membrane and configured to transfer pressure from outside of the implantable pressure sensor arrangement onto the flexible membrane wherein a differential pressure is generated on the two sides of the flexible membrane thereby causing the flexible membrane to deflect towards and away from the coil, and an electrode coupled to the flexible membrane.

Abstract: A method for forming a nanofluidic channel measuring system is disclosed. The method includes forming a first trench in a substrate, forming a second trench in the substrate, the first trench and the second trench are separated by a first width, providing a first conductor pad at a first location, providing a second conductor pad at a second location, forming a first nano-wire for coupling the first conductor pad with the second conductor pad, and forming a nano-channel through the first nano-wire, the nano-channel also coupling the first trench and the second trench, the nano-channel configured to sever the first nano-wire. A nanofluidic channel measuring system is also disclosed.