1519 results about "Admittance" patented technology

A surgical instrument and method of controlling the surgical instrument are disclosed. The surgical instrument includes a housing and an elongated shaft that extends distally from the housing and defines a first longitudinal axis. The surgical instrument also includes a firing rod disposed in the elongated shaft and a drive mechanism disposed at least partially within the housing. The drive mechanism mechanically cooperates with the firing rod to move the firing rod. A motion sensor senses a change in the electric field (e.g., capacitance, impedance, or admittance) between the firing rod and the elongated shaft. The measurement unit determines a parameter of the motion of the firing rod, such as the position, speed, and direction of the firing rod, based on the sensed change in the electric field. A controller uses the measured parameter of the motion of the firing rod to control the drive mechanism.

A surgical instrument and method of controlling the surgical instrument are disclosed. The surgical instrument includes a housing and an elongated shaft that extends distally from the housing and defines a first longitudinal axis. The surgical instrument also includes a firing rod disposed in the elongated shaft and a drive mechanism disposed at least partially within the housing. The drive mechanism mechanically cooperates with the firing rod to move the firing rod. A motion sensor senses a change in the electric field (e.g., capacitance, impedance, or admittance) between the firing rod and the elongated shaft. The measurement unit determines a parameter of the motion of the firing rod, such as the position, speed, and direction of the firing rod, based on the sensed change in the electric field. A controller uses the measured parameter of the motion of the firing rod to control the drive mechanism.

The invention discloses a surgical instrument and method of controlling the surgical instrument, especially discloses a method and apparatus for determining parameters of linear motion in a surgical instrument. The surgical instrument includes a housing and an elongated shaft that extends distally from the housing and defines a first longitudinal axis. The surgical instrument also includes a firing rod disposed in the elongated shaft and a drive mechanism disposed at least partially within the housing. The drive mechanism mechanically cooperates with the firing rod to move the firing rod. A motion sensor senses a change in the electric field (e.g., capacitance, impedance, or admittance) between the firing rod and the elongated shaft. The measurement unit determines a parameter of the motion of the firing rod, such as the position, speed, and direction of the firing rod, based on the sensed change in the electric field. A controller uses the measured parameter of the motion of the firing rod to control the drive mechanism.

A method, system, server architecture and / or tangible medium upgrade and award admittance of events to an event customer, preferably via a data communication network. The method includes, for example, receiving a communication from the event customer, the communication including a request to obtain admittance to at least one event, the communication also including an identifier associated with the event customer, admitting the event customer at the point of sale system after verification of the request, and updating a database indicating that the request was processed. The method also includes determining first predetermined criteria associated with the event indicative of at least one other event customer not attending the event, releasing an allocation associated with the at least one other event customer, and notifying at least another of the event customers to perform the upgrade and / or reallocation.

A method, system, server architecture and / or tangible medium upgrade and award admittance of events to an event customer, preferably via a data communication network. The method includes, for example, receiving a communication from the event customer, the communication including a request to obtain admittance to at least one event, the communication also including an identifier associated with the event customer, admitting the event customer at the point of sale system after verification of the request, and updating a database indicating that the request was processed. The method also includes determining first predetermined criteria associated with the event indicative of at least one other event customer not attending the event, releasing an allocation associated with the at least one other event customer, and notifying at least another of the event customers to perform the upgrade and / or reallocation. Various optional embodiments are disclosed.

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.

Methods and systems for monitoring contact between a medical probe and tissue are provided. A medical probe is introduced into a patient adjacent the tissue. An electrical parameter, e.g., electrical admittance, is measuring between a first electrode located on the medical probe and a second electrode remote from the first electrode. The electrical parameter is amplitude modulated in response to a physiological cycle of the patient. Contact between the medical probe and the tissue is detected based on the amplitude modulation of the measured electrical parameter.

A piezoelectric resonator of the present invention is structured such that on a substrate 5 having a cavity 4 formed therein, a lower electrode 3, a piezoelectric body 1, a spurious component control layer 16, and an upper electrode 2 are formed in this order from bottom up. The spurious component control layer 16 is a layer for controlling a spurious frequency, and composed of, for example, a metallic material, a dielectric material, or a piezo electric material. By additionally providing the spurious component control layer 16, it is made possible to cause variation of the spurious frequency due to unwanted variation to become greater than variation in resonance frequency of the main resonance of the piezoelectric resonator. Thus, it is possible to realize a piezoelectric resonator having an admittance frequency response where no spurious component occurs between resonance frequency fr and antiresonance frequency fa.

The systems and methods of the present invention utilize a linear component of a non-linear, faradaic current response generated by a biological fluid sample when an AC excitation potential sufficient to produce such a faradaic current response is applied to the sample, in order to calculate the concentration of a medically significant component in the biological fluid sample. The current response is created by the excitation of electrochemical processes within the sample by the applied potential. Typically, the linear component of the current response to an applied AC potential contains phase angle and / or admittance information that may be correlated to the concentration of the medically significant component. Also typically, the fundamental linear component of the current response is utilized in the disclosed systems and methods. Harmonics of the fundamental linear component may also be used. Other methods and devices are disclosed.

A method and system for controlling admission of an end user to a multicast channel over a network implementing a source filtering protocol. Incoming packet traffic received by an edge router is snooped and, when a request to join a multicast channel is received, the traffic is analyzed. Any service policy associated with the traffic class is found and applied to packet traffic from the requesting user. The actions include accepting membership in a group associated with a multicast channel and pushing the packets to the end user. If the action is to deny membership, then the multicast packets are prevented from reaching the end user. In addition information is logged and may be used for billing purposes or for accumulating marketing or other such information. Also, the actions may be to limit the number of routing states, by denying admittance to a groups once a limit number of requests to join, or other such parameter, is reached. Such limiting will substantially prevent DOS attacks on a multicast router.

A “three-point” measurement technique effectively removes system effects to determine impedance, admittance, resistance, or conductance of an individual cell, battery, or interconnecting conductor embedded in a series or series-parallel electrochemical battery or fuel cell system. Three electrical contact points are defined. Two of these points bound the subject element. The third point is separated from the other two by a conducting path that may include one or more cells or batteries. By measuring dynamic parameters between alternate pairs of contact points, three dynamic parameter measurements are acquired. A mathematical computation combines the measurements and determines the dynamic parameter of a subject element as if it were alone—thus effectively “de-embedding” the subject element from the remainder of the system. A “four-point” extension of this technique permits measuring a dynamic parameter of a cell / battery disposed in a multiple-unit string of parallel-connected cells / batteries.

A system and method for wirelessly generating a roster of drivers and passengers in transportation vehicles. A driver's or passenger's smartphone can communicate using short-range communications with the vehicle, or a smartphone in the vehicle, so that the ID associated with the phone can be linked to a vehicle ID, date and time stamped, and stored in a log or database. Any unauthorized person can be refused admittance (by not permitting the vehicle to start or otherwise being denied the right to be a driver or passenger). A downloaded application is used for this purpose. The invention also can include a secure, remote database as well as a mobile device such as a smartphone running the application, a wireless receiver / transmitter in the vehicle, and a wireless communication network such as a cellular network.

A system and methods controls access to an accessed system utilizing a two-factor requirement for admittance. One factor may be biometric data read and extracted from an individual wishing to gain access to the accessed system. The other factor may be an electronic key signal received at an input device of the access control system that is converted to an input signal. In some instances, the input signal is used to access correlating biometric data in a memory. Then, the extracted live biometric data and the stored biometric data are compared to generate a matching result signal. The matching results signal is transmitted to a Wiegand access control panel to control access to the accessed system. In other instances, the extracted live biometric data is compared to biometric data stored in a memory corresponding to a plurality of individual's biometric data that are allowed access to the accessed system. If there is a match, an ID biometric signal is generated and transmitted to the Wiegand access control panel. Along with the ID biometric signal, and ID input signal is transmitted from an input device to the Wiegand access control panel, where the ID input signal is based on receiving an electronic key at the input device. Then, based on a comparison between the ID biometric signal and the ID input signal, the Wiegand access control panel controls access to the accessed system.

A method of manufacturing an inflatable dunnage bag having a wall construction of two integrally fused layers of thermoplastic polymer, the outer layer of which is a sleeve of strips of woven polymer, the inner of layer of which is a continuous layer of gas impervious polymer. The ends of the sleeve are sealed against the escape of gas. The wall of the bag has a valve for the admittance of gas to the interior of the bag. The bag is formed by deposition of a continuous molten layer of gas impervious polymer to a sleeve of strips of woven polymer, installing a valve for admittance of gas into the wall of the sleeve and forming a gas tight seal at the ends of the sleeve. Deposition of the continuous layer of gas impervious polymer may be a two-step process wherein a molten layer of gas impervious polymer is deposited to one exterior side of the flattened sleeve, then to the other exterior side of the flattened sleeve and the sleeve turned "inside-out". The ends of the bag are sealed, may be folded, the folds secured to the exterior of the bag by adhesive and a binding strip. The dunnage so manufactured is strong, lightweight, scuff resistant, moisture resistant, reusable or easily recyclable.

Various techniques are provided for calibrating and estimating left atrial pressure (LAP) using an implantable medical device, based on impedance, admittance or conductance parameters measured within a patient. In one example, default conversion factors are exploited for converting the measured parameters to estimates of LAP. The default conversion factors are derived from populations of patients. In another example, a correlation between individual conversion factors is exploited to allow for more efficient calibration. In yet another example, differences in thoracic fluid states are exploited during calibration. In still yet another example, a multiple stage calibration procedure is described, wherein both invasive and noninvasive calibration techniques are exploited. In a still further example, a therapy control procedure is provided, which exploits day time and night time impedance / admittance measurements.

A method of analyzing supply voltage drops in a power grid for distributing power to an integrated circuit chip during design. The method initially comprises providing a library of circuits for use in designing an integrated circuit chip and determining a supply current requirement and an operating voltage range for each circuit in the circuit library. The method then includes calculating an admittance matrix representing the power grid with a pre-specified array of circuit ports defined by intersection of the power grid and a modeling grid, assigning regions of the power grid to each of the ports, and placing a set of circuits from the circuit library in regions on the power grid. The method further includes calculating a total node current at each of the ports by summing current requirements of all of the circuits located in the regions, calculating a node voltage at each of the ports by solving a system of linear equations corresponding to the calculated admittance matrix, imposing a penalty to each node having a node voltage outside of a predetermined range, and calculating the node voltages and the penalties to a cost-based floorplanning / placement analysis tool.

An apparatus for determining tissue versus fluid components of an organ include a detector that generates a detector signal based on electrical signals derived from tissue and fluid. The apparatus includes a signal processor in communication with the detector which subtracts in real time a tissue component from the detector signal and produces a fluid volume signal. A method for monitoring a patient's fluid volume of a patient's organ. An apparatus for monitoring a patient's organ. A method for monitoring a patient's organ. A method to piggyback an admittance system onto a AICD / Bi-ventricular Pacemaker for a heart of a patient, in particular a weakened heart having features consistent with congestive heart failure. An apparatus for monitoring an organ, such as a heart, lungs, brain, skeletal muscle, and bladder of a patient which includes a detector which detects the admittance of the organ. The apparatus includes a transmitter in communication with the detector which transmits a wireless signal indicative of the admittance of the organ. A method for monitoring an organ of a patient includes the steps of detecting with a detector the admittance of the organ. There is the step of transmitting with a transmitter in communication with the detector a wireless signal indicative of admittance of the organ.

The invention relates to the technical field of operation and control of an electric power system and discloses a method for detecting and identifying dynamic bad data of the electric power system. The method comprises the steps of A, reading a current network parameter and a network topology of the electric power system and forming a node admittance matrix and a branch circuit-node incidence matrix; B, establishing an equivalent circuit according to the network topology of the electric power system and configuring measurement functions and a power management unit (PMU) of the electric power system, wherein system measurement includes node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node trend measurement; C, detecting and identifying the dynamic bad data of the electric power system; D, judging the convergence condition. By means of the method, accidentally arisen bad data from a supervisory control and data acquisition (SCADA) system and in the PMU measurement can be found and eliminated, and accordingly an accurate operation state, voltage amplitude and phase angles of nodes of a power grid are obtained.

A piezoelectric resonator of the present invention is structured such that on a substrate 5 having a cavity 4 formed therein, a lower electrode 3, a piezoelectric body 1, a spurious component control layer 16, and an upper electrode 2 are formed in this order from bottom up. The spurious component control layer 16 is a layer for controlling a spurious frequency, and composed of, for example, a metallic material, a dielectric material, or a piezo electric material. By additionally providing the spurious component control layer 16, it is made possible to cause variation of the spurious frequency due to unwanted variation to become greater than variation in resonance frequency of the main resonance of the piezoelectric resonator. Thus, it is possible to realize a piezoelectric resonator having an admittance frequency response where no spurious component occurs between resonance frequency fr and antiresonance frequency fa.

A cooled acoustic liner useful in a fluid handling duct includes a resonator chamber 52 with a neck 56, a face sheet 86, and a coolant plenum 80 residing between the face sheet and the chamber. Coolant bypasses the resonator chamber, rather than flowing through it, resulting in better acoustic admittance than in liners in which coolant flows through the resonator chamber and neck. In one embodiment, the liner also includes a graze shield 88. Openings 40, 38 penetrate both the face sheet and the shield to establish a relatively low face sheet porosity and a relatively high shield porosity. The shielded embodiment of the invention helps prevent a loss of acoustic admittance due to fluid grazing past the liner. Another embodiment that is not necessarily cooled, includes the resonator chamber, low porosity face sheet and high porosity shield, but no coolant plenum for bypassing coolant around the resonator chamber. An associated method of retrofitting an acoustic treatment into a fluid handling module includes installing openings in the module and mounting a resonator box 44 on the module so that the inlets to the resonator necks register with the installed openings.

A method and a corresponding system for error checking an electrochemical sensor having at least two electrodes and a liquid measuring medium applied thereto are disclosed. The method comprises determining a first admittance between a first set of electrodes of the sensor; determining a second admittance between a second set of electrodes of the sensor; determining a value using the first admittance and the second admittance; and displaying an error message if the value is out of a predetermined tolerance.

A method and a corresponding system for error checking an electrochemical sensor having at least two electrodes and a liquid measuring medium applied thereto are disclosed. The method involves determining a first admittance between a first set of electrodes of the sensor; determining a second admittance between a second set of electrodes of the sensor; determining a value using the first admittance and the second admittance; and displaying an error message if the value is out of a predetermined tolerance.

The invention relates to sweat activity measurement, e.g. for determining a physiological state of a subject, embodied by a method as well as a kit with an immittance measuring circuit and electrodes with contact electrolyte. Sweat activity is considered a transport phenomenon and can be defined as a flux, e.g. gram water per skin area per second. Prior art methods determining water absorbed per gram dry stratum corneum measures skin moisture and do not truly reflect sweat activity. A periodic signal with frequency of 60 Hz or lower is applied to reduce contribution from complex admittance of the skin, and skin conductance is measured as a degree of sweat activity. The contact electrolyte allows filling of sweat ducts with sweat from sweat glands, this may be characterized in that it does not substantially fill the sweat ducts when being positioned on the skin and / or in that it has a re-absorption time constant from the sweat ducts into the Epidermis of less than 15 min.

An optical noise reduction mechanism for reducing undesired frustration of total internal reflected light. Such optical noise may stem from defects in waveguide construction. Such optical noise may also stem from the difference in refractive index between any cladding layers disposed onto the planar waveguide and the refractive index of the medium (e.g., air) between the light sources and the light insertion surface of the planar waveguide. By interposing a material of appropriate refractive index, either as a thin layer onto the light insertion surface of the waveguide or filling the space between the waveguide and the light source, the planar waveguide becomes more tolerant of geometry errors and cladding layer properties because a safe operating area is established between the unadjusted critical angle of the system and the actual range of ray angles allowed admittance into the waveguide.