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Production simulator for simulating a mature hydrocarbon field

A production simulator (2), for simulating a mature hydrocarbon field, providing quantity produced (Qφktb) per phase, per well, per layer (or group of layers) and per time as a function of production parameters (PP), wherein the production simulator (2) matches history data (HD) of the mature hydrocarbon field and verifies a Vapnik condition.




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System and method for use in simulating a subterranean reservoir

A computer-implemented method, system, and computer program product are disclosed for updating simulation models of a subterranean reservoir. An ensemble of reservoir models representing a subterranean reservoir having non-Gaussian characteristics is provided and the ensemble of reservoir models is updated using a subspace ensemble Kalman filter. Kemal principle component analysis parameterization or K-L expansion parameterization can be used to update the ensemble of reservoir models.




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Systems and methods for subsurface oil recovery optimization

Systems and methods for subsurface secondary and/or tertiary oil recovery optimization based on either a short term, medium term or long term optimization analysis of selected zones, wells, patterns/clusters and/or fields.




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Real-time predictive systems for intelligent energy monitoring and management of electrical power networks

A system for intelligent monitoring and management of an electrical system is disclosed. The system includes a data acquisition component, a power analytics server and a client terminal. The data acquisition component acquires real-time data output from the electrical system. The power analytics server is comprised of a real-time energy pricing engine, virtual system modeling engine, an analytics engine, a machine learning engine and a schematic user interface creator engine. The real-time energy pricing engine generates real-time utility power pricing data. The virtual system modeling engine generates predicted data output for the electrical system. The analytics engine monitors real-time data output and predicted data output of the electrical system. The machine learning engine stores acid processes patterns observed from the real-time data output and the predicted data output to forecast an aspect of the electrical system.




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Method and apparatus for simulating operation in a data processing system

Methods and systems are provided for executing a simulation of an operation in a data processing system. In one implementation, the method includes executing an operation under a first set of conditions, determining a characteristic associated with the execution of the operation under the first set of conditions, and executing a simulation of the operation under a second set of conditions different from the first set of conditions. The simulation of the operation is constrained by the determined characteristic. The method can further include determining a cost/benefit of executing the operation under a set of conditions different from the first set of conditions based at least in part on the simulation.




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Systems and methods for solar power equipment

A design system for generating a power equipment proposal for a particular location, comprises an insolation database, a load database, and a processing system. The insolation database comprises insolation values associated with a plurality of geographic data points. The load database associates appropriate power equipment with load requirements. The processing system generates at least one power equipment proposal based on load requirements generated from the insolation database based on the insolation values associated with a geographic data point closest to the particular location and solar power equipment appropriately selected from the load database based on the load requirements generated from the insolation database.




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Electrical-thermal co-simulation with joule heating and convection effects for 3D systems

In a method for simulating temperature and electrical characteristics within an circuit, a temperature of at least one volume within the circuit as a function of a resistance within the at least one volume is repeatedly calculated and the resistance as a function of the temperature is repeatedly calculated until the temperature is within a predetermined tolerance of a previous temperature result and until the resistance is within a predetermined tolerance of a previous resistance result. Once the temperature is within a predetermined tolerance of the previous temperature result and the resistance is within a predetermined tolerance of the previous resistance, then an output indicative of the temperature is generated.




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Systems and methods for phase predictive impedance loss model calibration and compensation

The systems and methods of the present disclosure calibrate impedance loss model parameters associated with an electrosurgical system having no external cabling or having external cabling with a fixed or known reactance, and obtain accurate electrical measurements of a tissue site by compensating for impedance losses associated with the transmission line of an electrosurgical device using the calibrated impedance loss model parameters. A computer system stores voltage and current sensor data for a range of different test loads and calculates sensed impedance values for each test load. The computer system then predicts a phase value for each load using each respective load impedance value. The computer system back calculates impedance loss model parameters including a source impedance parameter and a leakage impedance parameter based upon the voltage and current sensor data, the predicted phase values, and the impedance values of the test loads.




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Computer system, program, and method for assigning computational resource to be used in simulation

The cost necessary for introducing and maintaining a development environment that includes multiple simulators is suppressed, and a sharing of designing information is promoted, to make parameter adjustment of simulators easy. Provided is a service that unifies development environment on a computer provided with: a working computer system that can guarantee that there is no leaking of designing files; a user behavior monitoring system that collects utilization history of simulators or software, for each of the users, and selects development process of each of the users from the collected information; and a dynamic computational-resource distribution system that can conduct an automatic optimization of a complex simulation configuration, from information collected by the aforementioned user behavior monitoring system.




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Device for the collection and processing of information relating to the exposure of one or more persons to one or more products of chemical or biological origin and method for the use of such a device

A device for the collection and processing of information relating to the exposure of one or more persons to one or more products of chemical or biological origin has: at least one coded sensor for automatic or semi-automatic identification of a person likely to be exposed to at least one product,at least one coded sensor for the collection of information relating to the handling of at least one product by the person likely to be exposed to the product,at least one sensor for validating the information collected by the identification and collection sensors,at least one module for reading at least one coded sensor, anda module for processing information collected by the sensors.




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Method of material modeling for crash test dummy finite element models

A computer method of material modeling for crash test dummy finite element models includes the steps of making a material card for the material, applying the material card to validate a finite element model of a crash test dummy component, determining whether the finite element model is acceptable, ending the method if the finite element model is acceptable, and adjusting a relative volume (J) range for the material to make the material soft or stiff if the finite element model is not acceptable.




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System and method for forecasting production from a hydrocarbon reservoir

A system and method is taught to substantially automate forecasting for a hydrocarbon producing reservoir through integration of modeling module workflows. A control management module automatically generates static and dynamic offspring models, with static and dynamic modeling software, until a performance objective associated with the forecasting of the reservoir is satisfied. The performance objective can include an experimental design table to determine a sensitivity of a particular parameter or can be directed towards reservoir optimization, i.e., ultimate hydrocarbon recovery, net present value, reservoir percentage yield, reservoir fluid flow rate, or history matching error.




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Systems and methods for identifying personalized vascular implants from patient-specific anatomic data

Embodiments include methods of identifying a personalized cardiovascular device based on patient-specific geometrical information, the method comprising acquiring an anatomical model of at least part of the patient's vascular system; performing, using a processor, one or more of geometrical analysis, computational fluid dynamics analysis, and structural mechanics analysis on the anatomical model; and identifying, using the processor, a personalized cardiovascular device for the patient, based on results of one or more of the geometrical analysis, computational fluid dynamics analysis, and structural mechanics analysis of anatomical model.




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Systems and methods for identifying personalized vascular implants from patient-specific anatomic data

Embodiments include methods of identifying a personalized cardiovascular device based on patient-specific geometrical information, the method comprising: generating a patient specific model of at least a portion of a patient's vasculature from image data of the patient's vasculature and one or more measured or estimated physiological or phenotypic parameters of the patient; determining pathology characteristics from cardiovascular geometry of the patient specific model; defining an objective function for a device based on design considerations and one or more estimates of hemodynamic and mechanical characteristics; optimizing the objective function, by simulating at least one change in devices and evaluating the objective function using fluid dynamic or structural mechanic analysis; and using the optimized objective function to either (i) select a device from a set of available devices or (ii) manufacture a desired device.




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Method and system for efficient emulation of multiprocessor memory consistency

A method (and system) of emulation in a multiprocessor system, includes performing an emulation in which a host multiprocessing system of the multiprocessor system supports a weak consistency model, and the target multiprocessing system of the multiprocessor system supports a strong consistency model.




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Method for computer-aided closed-loop and/or open-loop control of a technical system

A method for computer-aided closed and/or open-loop control of a technical system is provided. A first value of an output quantity is predicted on a data-based model at a current point in time. A second value of the output quantity is determined from an analytical model. The state of the technical system at the current point is assigned a confidence score in the correctness of prediction of the data-based model. A third value of the output quantity is determined from the first and second value as a function of the confidence score for controlling the technical system. A suitable value for the output quantity can be derived from the analytical model even for regions of the technical system in which the quality of prediction of the data-based model is low because of a small set of training data. The technical systems can be turbines, such as gas turbines.




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Method of providing data included in building information modeling data file, recording medium therefor, system using the method, and method of providing data using building information modeling server

A method of providing data included in a building information modeling (BIM) data file using a server is provided. The method includes retrieving mapping data corresponding to a user request, extracting data corresponding to at least one entity mapped to the mapping data from the BIM data file, and transmitting the extracted data to a client.




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Computer-implemented systems and methods for testing large scale automatic forecast combinations

Systems and methods are provided for evaluating performance of forecasting models. A plurality of forecasting models may be generated using a set of in-sample data. Two or more forecasting models from the plurality of forecasting models may be selected for use in generating a combined forecast. An ex-ante combined forecast may be generated for an out-of-sample period using the selected two or more forecasting models. The ex-ante combined forecast may then be compared with a set of actual out-of-sample data to evaluate performance of the combined forecast.




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Apparatus, methods and systems for parallel power flow calculation and power system simulation

According to one aspect, an apparatus for computing a solution to a power flow problem for an electrical power system comprising a plurality of buses. The apparatus includes (a) at least one processor comprising a plurality of cores; and (b) memory coupled to the at least one processor for storing an admittance matrix for the power system, real power and reactive power for each bus, and an initial complex voltage for each bus; (c) wherein the at least one processor is configured to: (i) perform a Jacobi power flow calculation for each bus to determine the complex voltage for each bus, the Jacobi power flow calculation using the admittance matrix, the real power and reactive power for each bus, and the initial complex voltage for each bus as inputs, wherein at least two Jacobi power flow calculations are performed concurrently on the plurality of cores; (ii) calculate a power mismatch at each bus based on the complex voltages; and (iii) determine whether the Jacobi power flow calculations have converged based on the power mismatch and repeat (i) to (iii) if the Jacobi power flow calculations have not converged.




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Methods, systems, and computer readable media for simulating realistic movement of user equipment in a long term evolution (LTE) network

Methods, systems, and computer readable media for simulating realistic movement of user equipment in an LTE network are disclosed. According to one method, a logical topology of a long term evolution (LTE) access network is defined that includes defining connections between one or more eNodeBs (eNBs). A physical topology of the LTE access network is defined that includes defining locations of the eNBs and sectors, where the physical network topology is mapped to the logical network topology. One or more problem areas are defined within the physical network topology, where the one or more problem areas include locations where signal quality is degraded. One or more paths are defined through the physical network topology. A traffic profile for a user equipment (UE) device is defined. A plurality of messages is generated for simulating the movement of a UE device along a path through the physical network topology.




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Coating composition, a film containing the same, and a method for forming a sealable film

A coating composition comprising: an aqueous dispersion comprising: the melt-kneading product of (A) a base polymer which comprises one or more thermoplastic polymers, (B) a stabilizing agent which comprises at least one component selected from the group consisting of acrylic acid grafted ethylene-based polymers and maleic anhydride grafted polyolefins; (C) a neutralizing agent; and (D) water; wherein the aqueous dispersion has a volume average particle size of less than about 5 μm is provided.




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Systems and methods for controlling damping of magnetic media for heat assisted magnetic recording

Systems and methods for controlling the damping of magnetic media for heat assisted magnetic recording are provided. One such system includes a heat sink layer, a growth layer on the heat sink layer, a magnetic recording layer on the growth layer, where the growth layer is configured to facilitate a growth of a preselected crystalline structure of the magnetic recording layer, and a capping magnetic recording layer on the magnetic recording layer, the capping recording layer including a first material configured to increase a damping constant of the capping recording layer to a first preselected level.




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Polymeric materials for use in metal-oxide-semiconductor field-effect transistors

Disclosed are polysulfone-based materials that can be used as active and/or passive components in various electronic, optical, and optoelectronic devices, particularly, metal-oxide-semiconductor field-effect transistors. For example, various metal-oxide-semiconductor field-effect transistors can include a dielectric layer and/or a passivation layer prepared from such polysulfone-based materials and exhibit good device performance.




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Multilayer printed wiring board and method for manufacturing multilayer printed wiring board

A multilayer printed wiring board including a first interlayer resin insulation layer, a first conductive circuit formed on the first interlayer resin insulation layer, a second interlayer resin insulation layer formed on the first interlayer resin insulation layer and the first conductive circuit and having an opening portion exposing a portion of the first conductive circuit, a second conductive circuit formed on the second interlayer resin insulation layer, a via conductor formed in the opening portion of the second interlayer resin insulation layer and connecting the first conductive circuit and the second conductive circuit, and a coating layer having a metal layer and a coating film and formed between the first conductive circuit and the second interlayer resin insulation layer. The metal layer is formed on the surface of the first conductive circuit and the coating film is formed on the metal layer.




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Printhead with nanotips for nanoscale printing and manufacturing

A nanoprinthead including an array of nanotip cantilevers, where each nanotip cantilever includes a nanotip at an end of a cantilever, and a method for forming the nanoprinthead. Each nanotip may be individually addressable through use of an array of piezoelectric actuators. Embodiments for forming a nanoprinthead including an array of nanotip cantilevers can include an etching process from a material such as a silicon wafer, or the formation of a metal or dielectric nanotip cantilever over a substrate. The nanoprinthead may operate to provide uses for technologies such as dip-pen nanolithography, nanomachining, and nanoscratching, among others.




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Method for perfusing a biocompatible material graft with a liquid and perfusion kit

A method for perfusing a biocompatible material graft with a perfusion liquid includes the steps of: introducing the graft (100) in a perfusion chamber (2), arranging a transfer chamber (3) partly filled with the perfusion liquid (101), coupling in a tight manner the perfusion chamber (2) and the transfer chamber (3) for establishing a fluid communication between them, lowering the pressure in the transfer chamber (3) for transferring therein part of the air existing in the perfusion chamber (2), increasing the pressure within the transfer chamber (3) for injecting in the perfusion chamber (2) the perfusion liquid (101) existing in the transfer chamber (3). A perfusion kit includes a perfusion chamber (2) apt to contain a graft (100) to be perfused with a liquid (101) and a transfer chamber (3) apt to contain a liquid (101) to be perfused, the perfusion chamber (2) being connectable in a tight manner with the transfer chamber (3) for allowing a fluid exchange between the two chambers (2, 3) and inhibiting a fluid exchange between the two chambers (2, 3) and the external environment.




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Methods for improving integrated photonic device uniformity

A method is described for improving the uniformity over a predetermined substrate area of a spectral response of photonic devices fabricated in a thin device layer. The method includes (i) establishing an initial device layer thickness map for the predetermined area, (ii) establishing a linewidth map for the predetermined area, and (iii) establishing an etch depth map for the predetermined area. The method further includes, based on the initial device layer thickness map, the linewidth map and the etch depth map, calculating an optimal device layer thickness map and a corresponding thickness correction map for the predetermined substrate area taking into account photonic device design data. Still further, the method includes performing a location specific corrective etch process in accordance with the thickness correction map.




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Method for producing transparent conductive film, transparent conductive film, transparent conductive substrate and device comprising the same

Provided is a method for producing a transparent conductive film which is formed via a coating step, a drying step and a baking step, wherein the baking step is characterized in that the dried coating film containing the organic metal compound as the main component is baked by being heated to a baking temperature or higher, at which at least the inorganic component is crystallized, under an oxygen-containing atmosphere having a dewpoint of −10° C. or lower, whereby an organic component contained in the dried coating film is removed therefrom by a heat decomposition, a combustion or the combination thereof to thereby form a conductive oxide microparticle layer densely filled with conductive oxide microparticles containing the metal oxide as a main component.




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Pattern formation method

According to the embodiments, a pattern formation method includes a process of formation of a self-assembly material layer containing at least a first segment and a second segment on a substrate having a guide layer, a process of formation of a neutralization coating on the self-assembly material layer, and a process of formation of a self-assembly pattern including a first region containing the first segment and a second region containing the second segment following phase separation of the self-assembly material layer.




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Dual cure method for ink for increased durability and adhesion to golf balls

A method is disclosed for curing ink printed images on golf balls by printing an image onto a golf ball and exposing the printed image to infrared radiation, then exposing the printed image to ultraviolet radiation.




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Covalently bound monolayer for a protective carbon overcoat

A magnetic data storage medium may include a substrate, a magnetic recording layer, a protective carbon overcoat, and a monolayer covalently bound to carbon atoms adjacent a surface of the protective carbon overcoat. According to this aspect of the disclosure, the monolayer comprises at least one of hydrogen, fluorine, nitrogen, oxygen, and a fluoro-organic molecule. In some embodiments, a surface of a read and recording head may also include a monolayer covalently bound to carbon atoms of a protective carbon overcoat.




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Method and apparatus for the formation of hydrophobic surfaces

The invention relates to the application of a coating to a substrate in which the coating includes a polymer material and the coating is selectively fluorinated and/or cured to improve the liquid repellance of the same. The invention also provides for the selective fluorination and/or curing of selected areas of the coating thus, when completed, providing a coating which has regions of improved liquid repellance with respect to the remaining regions and which remaining regions may be utilized as liquid collection areas.




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Depositing polymer solutions to form optical devices

Provided are methods of depositing polymer solutions on substrates to form various optical elements. A polymer solution may include about 0.1%-30% by weight of a specific polymer having rigid rod-like molecules. The molecules may include various cores, spacers, and sides groups to ensure their solubility, viscosity, and cross-linking ability. The deposition techniques may include slot die, spray, molding, roll coating, and so forth. Pre-deposition techniques may be used to improve wettability and adhesion of substrates. Post-deposition techniques may include ultraviolet cross-linking, specific drying techniques, evaporation of solvent, treating with salt solutions, and shaping. The disclosed polymers and deposition processes may yield optical elements with high refractive index values, such as greater than 1.6. These optical elements may be used as +A plates, −C plates, or biaxial polymers and used as retarders in LCD active panels or as light collimators and light guides.




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System and method for implantable medical device lead shielding

An implantable medical device (IMD) can include a cardiac pacemaker or an implantable cardioverter-defibrillator (ICD). Various portions of the IMD, such as a device body, a lead body, or a lead tip, can be provided to reduce or dissipate a current and heat induced by various external environmental factors. According to various embodiments, features can be incorporated into the lead body, the lead tip, or the IMD body to reduce the creation of an induced current, or dissipate the induced Current and heat created due to an induced current in the lead. For example, an IMD can include at least one outer conductive member and a first electrode. The first electrode can be in electrical communication with the at least one outer conductive member. The first electrode can dissipate a current induced in the at least one outer conductive member via a first portion of the anatomical structure.




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Catheter electrode assemblies and methods for construction therefor

A family of catheter electrode assemblies includes a flexible circuit having a plurality of electrical traces and a substrate; a ring electrode surrounding the flexible circuit and electrically coupled with at least one of the plurality of electrical traces; and an outer covering extending over at least a portion of the electrode. A non-contact electrode mapping catheter includes an outer tubing having a longitudinal axis, a deployment member, and a plurality of splines, at least one of the plurality of splines comprising a flexible circuit including a plurality of electrical traces and a substrate, a ring electrode surrounding the flexible circuit and electrically coupled with at least one of the plurality of electrical traces; and an outer covering extending over at least a portion of the ring electrode. A method of constructing the family of catheter electrode assemblies is also provided.




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Retractable screw intracardiac lead for cardiac stimulation and/or defibrillation

A retractable screw-type stimulation or defibrillation intracardiac lead is disclosed. According to one embodiment, the lead comprises a flexible hollow sheath (12) having at its distal end a lead head (10) and a connector (66) at its proximal end. The connector comprises a pin (62) connected to a lead head electrode (18). The lead head comprises a tubular body (28), at least one electrode (18, 20) for stimulation or defibrillation, a moving element translationally and rotationally moving within the tubular body in a helical motion, an anchoring screw (24) axially moving with respect to the tubular body, and a deployment mechanism (22) to deploy the anchoring screw out of the tubular body (28). The lead is a co-radial type, and the moving element (26) secured to the anchoring screw is connected to the tubular body (28) by a helical guide (46) and a coupling finger (56) protruding between two successive turns of the helical guide (46) for transforming a rotary movement imparted to the lead body in a deployment or retraction movement of the moving element (26). The helical guide (46) is resiliently compressible, with a free end (52) with a flat area (54) facing a flange (38) in vis-à-vis, so as to pinch the coupling finger (56) and to perform the function of a clutch limiting the torque transmitted to the anchoring screw by the rotation of the lead body, even in case of continuation of this rotation.




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Enhanced therapeutic stimulus for non-nutritive suck entrainment system and method

The present invention relates to a system and method for using the system. In particular, the present invention relates to an application, executable by a processing device to assess the organization of a non-nutritive suck (NNS) pattern of a patient and to entrain an organized NNS pattern in the patient. The software system receives data from an orofacial stimulation appliance to assess the patient's natural NNS pattern and generates a precise therapeutic pulse profile that is actuated as a tactile stimulus via the orofacial stimulation appliance to entrain an organized NNS pattern.




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Skull-focused RF-based stimulation apparatus, system and method for treating patients with Alzheimer's disease or other dementia

The portable, wearable, proximal Alzheimer's disease treatment invention is based upon creating an RF field of particular frequencies and intensities that are applied to the patient's head. To accomplish the aforementioned disease treatment functionality, a system was invented comprising a network of antennas connected to an RF generator via a feedline connector. The invention also provides methods for using measurements to monitor and manage the effectiveness of an ongoing disease treatment regimen, and databases which contain information about measurements, variables, and their relationships to clinical outcome.




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Applicator head and method for treatment of pain by transcutaneous electrical nerve stimulation

Embodiments of the present invention include an apparatus and method for treatment of pain by a device that provides transcutaneous electrical nerve stimulation. The device includes an applicator equipped with an electric pulse provider that sends an electric pulse to a set of electrodes disposed in an applicator head. The device is placed onto the skin of a patient's body at the point where the patient experiences pain and such that the electrodes of the device contact the skin of the patient while an insulating land area between the electrodes compresses the nerve during transmittal of the electric pulse through the electrodes and into the patient's body.




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Electronic stimulation textile for traditional Chinese medicine therapy

A textile for providing traditional Chinese medicine therapy to a wearer using electronic stimulation includes at least two conductive paths that are made from conductive textile material, the conductive paths are separated by nonconductive textile material, at least one pair of electrodes attach to the conductive paths corresponding to specific part of body or acupoints according to traditional Chinese medicine theory, and an electronic stimulation signal controller configured to conduct electronic stimulation signals to the electrodes via the conductive paths.




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System and method for fractional treatment of skin

A system and method for treatment of skin including a treatment surface having numerous small energy emitting points for fractional skin treatment as well as negative pressure outlets. During a treatment, negative pressure from the outlets may exert a pulling force on an opposing tissue surface to bring the tissue into contact with the energy points.




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Signal transmitting and lesion excluding heart implants for pacing, defibrillating, and/or sensing of heart beat

Devices, systems, and methods for treating a heart of a patient may make use of structures which limit a size of a chamber of the heart, such as by deploying a tensile member to bring a wall of the heart toward (optionally into contact with) a septum of the heart. The implant may include an electrode or other structure for applying pacing signals to one or both ventricles of the heart, for defibrillating the heart, for sensing beating of the heart or the like. A wireless telemetry and control system may allowing the implant to treat congestive heart failure, monitor the results of the treatment, and apply appropriate electrical stimulation.




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Diamond window component for a laser tool

A component for a laser tool, the component comprising: a tubular body defining an internal channel and an aperture; and a window disposed across the aperture and bonded to the tubular body around the aperture, wherein the window is diamond, and wherein the tubular body comprises a material having a coefficient of linear thermal expansion α of 14×10−6 K−1 or less at 20° C. and a thermal conductivity of 60 Wm−1K−1 or more at 20° C.




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System and method for power-efficient transmission of EMG data

The system for displaying muscle force data includes a wearable patch and a remote visual display. The wearable patch carries electrodes suitable for sensing electromyographic signals on the skin of the patient. The patch carries circuitry which converts the detected electromyographic signal to a digital output which can be transmitted to the remote visual display. The circuitry relies on filtering to produce a usable digital signal at very low power consumption. The transmitted signal can be used to drive a variety of visual displays, including a conventional hand-held personal communicators and entertainment devices which had been programmed to suitably process the visual display.




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Method and apparatus for quantitative nerve localization

A method for localizing a needle to a nerve, the method comprising: using the needle to electrically stimulate the nerve, with a known current intensity, so as to evoke a nerve response;detecting the nerve response;analyzing the detected nerve response so as to identify at least one attribute of the same; andconfirming that the needle is in the immediate proximity of the nerve based upon known current intensity and at least one identified attribute of the detected nerve response.




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Algorithm for the automatic determination of optimal AV and VV intervals

Methods and devices for determining optimal Atrial to Ventricular (AV) pacing intervals and Ventricular to Ventricular (VV) delay intervals in order to optimize cardiac output. Impedance, preferably sub-threshold impedance, is measured across the heart at selected cardiac cycle times as a measure of chamber expansion or contraction. One embodiment measures impedance over a long AV interval to obtain the minimum impedance, indicative of maximum ventricular expansion, in order to set the AV interval. Another embodiment measures impedance change over a cycle and varies the AV pace interval in a binary search to converge on the AV interval causing maximum impedance change indicative of maximum ventricular output. Another method varies the right ventricle to left ventricle (VV) interval to converge on an impedance maximum indicative of minimum cardiac volume at end systole. Another embodiment varies the VV interval to maximize impedance change.




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Implantable system for flow measurement including charge amplifier

An implantable medical device lead having a flow measurement sensor mounted thereon is provided with a capsule mounted proximate to the sensor. The capsule is used to house electrical circuitry corresponding to the sensor in order to prevent impedance on conductors of the lead, which gradually decreases over chronic periods, from directly affecting signal transmission between the sensor and the electrical circuitry. The electrical circuitry includes a charge amplifier used for processing signals from the sensor. In some cases, the amplifier can be initially calibrated and periodically tuned so as to have consistent functioning with the sensor over chronic periods.




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Methods for promoting intrinsic activation in single chamber implantable cardiac pacing systems

Cardiac pacing methods for an implantable single chamber pacing system, establish an offset rate for pacing at a predetermined decrement from either a baseline rate (i.e. dictated by a rate response sensor), or an intrinsic rate. Pacing maintains the offset rate until x of y successive events are paced events, at which time the offset rate is switched to the baseline rate for pacing over a predetermined period of time. Following the period, if an intrinsic event is not immediately detected, within the interval of the offset rate, the rate is switched back to baseline for pacing over an increased period of time. Some methods establish a preference rate, between the offset and baseline rates, wherein an additional criterion, for switching from the offset rate to the baseline rate, is established with respect to the preference rate.




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Signal strength indicator for adjusting communication in a medical implant

It is critical in an inductively link medical implant, such as a visual prosthesis or other neural stimulator, to adjust the external coil to a location to maximize communication between the external coil and internal coil. Converting the signal strength between the coils to a signal easily discernible by a clinician, preferably an audible tone, facilitates the adjustment of the external coil to a preferred location.




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Safety system for electrostimulation device

A housing for an electrostimulation device comprising a charger plug and a stimulation plug, designed to receive respectively a connector linked to a charger and a connector linked to a stimulation electrode, characterized in that it comprises a mobile locking element designed to alternately lock the charger plug or the stimulation plug.