587 results about "Impulse generator" patented technology

Electroporation-based therapies (EBTs) employ high voltage pulsed electric fields (PEFs) to permeabilize tumor tissue, resulting in changes in passive electrical properties detectable using electrical impedance spectroscopy (EIS). Currently, commercial potentiostats for EIS are limited by impedance spectrum acquisition time (˜10 s); this timeframe is much larger than pulse periods used with EBTs (˜1 s). Fourier Analysis SpecTroscopy (FAST) is introduced as a methodology for monitoring tissue inter-burst impedance (diagnostic FAST) and intra-burst impedance (therapeutic FAST) during EBTs. FAST is a rapid-capture (<<1 s) technique which enables monitoring of inter-burst and intra-burst impedance during EBTs in real-time. FAST identified a frequency which delineates thermal effects from electroporation effects in measured impedance. Significance: FAST demonstrates the potential to perform EIS, in addition to intra-burst impedance spectroscopy, using existing pulse generator topologies.

Drilling mud is flowed through a valve assembly that is set at a particular open amount, measurements are taken of mud flowrate and a force exerted by the drilling mud onto a portion of the valve assembly, and density of the drilling mud is estimated based on historical data. The historical data is generated by directing multiple flows through the valve assembly, where the flows are at different flowrates, and at each flowrate different drilling muds having different densities are directed through the valve assembly. For each flow the valve assembly is adjusted to different open amounts, and a corresponding force exerted by the flow onto the valve assembly is measured. An example of the valve assembly is a mud pulser with a plug member that engages an orifice opening, a sensor in the pulser measures force exerted by the flow of mud.

The invention relates to the technical field of cylindrical lithium ion battery production, and discloses a method for detecting insufficient welding of a cylindrical lithium ion battery, and the method comprises the following steps: S1, appearance inspection; s2, initial internal resistance benchmark test; s3, applying a short-time large-current pulse to the battery by using a pulse generator, simulating an actual load condition, and recording an instantaneous voltage drop and current response curve of the voltage of the battery end during the pulse period; s4, performing infrared thermal imaging identification and data processing; s5, learning the picture and establishing a model; s6, comparing the test picture and the data with the model; s7, dynamic internal resistance calculation; s8, cold solder joint query and sorting processing; and S9, retesting the electrical performance. According to the invention, the technologies of dynamic internal resistance measurement, nondestructive X-ray or ultrasonic detection, rate discharge test and the like are adopted, so that efficient, accurate and nondestructive detection of the cold solder joint of the cylindrical lithium ion battery is realized, and the production efficiency and the detection precision are remarkably improved.

Systems and methods are disclosed for managing a tissue node potential of a neurostimulation system. The envisioned neurostimulation system can include an energy source, a housing or a housing portion, a stimulation node, a stimulation surface for contacting a tissue of a patient, and a control circuit. The control circuit can be configured to maintain at least one of the housing or housing portion, the stimulation node, or the stimulation surface at a predefined voltage or within a predefined voltage range.

The present disclosure provides an implanted nerve stimulator electrode for an implanted nerve stimulation system, the implanted nerve stimulator electrode being adapted to be at least partially implanted into a human body and receiving an electrical signal from an implanted pulse generator to apply electrical stimulation to the human body. An implanted nerve stimulator electrode includes an elongate body, a plurality of wires, and at least one nerve stimulation contact structure. The nerve stimulation contact structure is in a hollow sleeve shape and is suitable for being arranged on the main body in a sleeving mode. Each nerve stimulation contact structure comprises at least two contacts, and when the nerve stimulation contact structures are arranged on the main body in a sleeving mode, each contact on the nerve stimulation contact structure is electrically connected with one corresponding wire. After the nerve stimulation contact structure provided by the invention is sleeved on the main body, an operator can weld the corresponding wire to the contact under the condition of no shielding or little shielding, so that the welding difficulty from the contact to the wire is reduced. And the production efficiency is improved.

The invention provides a pulse field ablation system based on impedance dynamic feedback and a use method thereof, and the system comprises a pulse generator module which is used for generating a voltage pulse required by pulse field ablation; the ablation catheter module comprises a plurality of ablation electrodes and is used for transmitting the voltage pulses to the to-be-ablated heart tissue, and the activation modes of the ablation electrodes are determined according to the depth and range of the to-be-ablated heart tissue; the impedance detection module comprises an impedance sensor and is used for dynamically detecting electrical impedance in different ranges in the ablated heart tissue; the system control module is used for dynamically adjusting the voltage pulse generated by the pulse generator module, the activation modes of the plurality of ablation electrodes and the detection range of the impedance sensor according to different ranges of electrical impedance in the ablated heart tissue; and the visual interface interaction module is used for displaying the ablation process and serves as an operation interface of the ablation process. According to the invention, the assessment capability of the ablation effect can be improved, and the accuracy and success rate of the ablation process are ensured.

The invention is suitable for the technical field of power system high-voltage electrical equipment test, and provides a high-voltage circuit breaker direct test loop parameter setting method based on a particle swarm optimization algorithm, and the method comprises the steps: enabling a three-phase direct test loop to be equivalent to a single-phase loop according to symmetry, and enabling a transformer, an electric reactor, a power grid or an impact generator to be equivalent to an inductor and a voltage source; establishing an equation set according to the KCL, the KVL and element characteristics; performing nondimensionalization by using the voltage and current standard values and the conversion relation between the time domain and the angle domain to obtain a dimensionless equation; sorting to obtain a differential equation of per unit values of voltages at two ends of the circuit breaker and dimensionless parameters; and constructing an optimization search space and value function by taking the dimensionless parameters as decision variables of a particle swarm optimization algorithm, and operating the algorithm for multiple times to obtain the optimal dimensionless parameters so as to complete loop parameter setting. According to the scheme, test loop parameter setting can be automatically completed, manual debugging is reduced, the setting efficiency and precision are improved, and it is guaranteed that a circuit breaker test result meets the standard.

A lithotripsy device for tunneling through vascular occlusions comprises a tunneling catheter including a tunneling catheter shaft having a distal end and a proximal end. A tunneling probe is disposed on the distal end of the tunneling catheter shaft. The tunneling probe has a pair of electrodes; each electrode being operatively connected to an electrical lead within the tunneling catheter shaft. The leads are configured for operative connection to an external pulse generator. Activation of an external pulse generator operatively connected to the leads causes repeated electrical discharges between the electrodes. When the electrodes are an in a fluid, the repeated electrical discharges produce repeated hydraulic shock waves in the fluid directed away from the electrical discharges. When the repeated hydraulic shock waves strike calcified tissue, the calcified tissue is broken into a modified plaque. The modified plaque has a lower resistance to mechanical dislocation that the original calcified tissue.

A ripple voltage detector circuit comprises a pulse generator, a direct current-to-direct current (DC-DC) converter coupled to the pulse generator, and a first control loop coupled to the pulse generator and the DC-DC converter. The first control loop is configured to measure an output voltage of the DC-DC converter, determine an output ripple voltage of the output voltage, determine a ripple coefficient based on the output ripple voltage, determine a reference peak inductor current based on the ripple coefficient, and determine a peak value of an inductor current during a switching cycle, and transition a switching state of the DC-DC converter based on the reference peak inductor current and the peak value of the inductor current.

The invention relates to a device for performing electric field treatment on a digestive tract. The device comprises a catheter, a support body, an electrode array film and a pulse generator, the pulse generator comprises a current sensor for sensing current flowing through the electrode pair; in the initial time period, the voltage amplitude of the back pulse in the first sequence of pulse waves is larger than the voltage amplitude of the front pulse, and when the current sensor senses that the current is equal to or exceeds the lower limit value IS (MIN) of the set range, the absolute value US of the voltage amplitude of each pulse in the second sequence of pulse waves is equal in the next time period. The amplitude of the output voltage of the pulse generator is controlled through feedback of the current sensor, and the therapeutic instrument is safer for a human body during treatment.

The utility model discloses a mud pulse generator driven by a motor. The mud pulse generator is used for extracting signals of an inclinometer while drilling. Comprising a main valve head assembly and a servo assembly, the servo assembly comprises a screen drum and a valve seat arranged in the screen drum, a valve sleeve is arranged at a mud channel of the valve seat, the valve sleeve and a servo valve rod are oppositely arranged, and the servo valve rod can move to be seamlessly attached to the valve sleeve; a servo valve rod is connected with a ball screw nut, a hexagonal shaft sleeve on a ball screw shaft is connected with a speed reducer, the speed reducer is connected with a fixing seat assembly, and the periphery of the fixing seat assembly is sleeved with an outer rotor assembly. The outer rotor assembly is connected with the motor short section and is driven by the motor. The motor is used for driving, so that rigid collision between the servo valve rod and the valve sleeve can be effectively avoided, abrasion between the servo valve rod and the valve sleeve is reduced, and the service life of the servo valve rod and the valve sleeve is prolonged.

The invention provides a feed-through device, which is applied to a pulse generator and comprises a main body, at least one feed-through pin and a plurality of first electromagnetic shielding layers. The first electromagnetic shielding layers are integrally formed on the main body, and the multiple first electromagnetic shielding layers are stacked and arranged at intervals. Each feed-through pin passes through all the first electromagnetic shielding layers along the first direction, and the feed-through pin is isolated from any one of the first electromagnetic shielding layers. According to the feed-through device provided by the invention, the plurality of stacked first electromagnetic shielding layers are provided, so that a part of electromagnetic waves penetrating through the first electromagnetic shielding layer of the first layer can be absorbed or guided out by the first electromagnetic shielding layer behind in the processes of reflection, diffraction and the like; or is reflected or diffracted to be absorbed or led out by the upper first electromagnetic shielding layer again. The amount of electromagnetic waves passing through the current first electromagnetic shielding layer is greatly reduced compared with the amount of electromagnetic waves passing through the first electromagnetic shielding layer.

The present invention belongs to the technical field of logging-while-drilling instruments, and discloses a large-size high-speed shear valve type mud pulser capable of improving transmission rate and displacement. It includes a vortex generator drill collar with an internal turbine generator, a circuit drill collar with an internal instrument circuit, a pulser drill collar with an internal pulse generator, and a hard connection drill collar with an internal hard connection. At both ends of the circuit skeleton in the circuit drill collar, an upstream flow channel converter connected to the turbine generator and a downstream flow channel converter connected to the pulse generator are respectively connected. The pulse generator includes a motor housing connected to the downstream flow channel converter, a motor stator fixed therein, a motor rotor located inside the motor stator, a torsion shaft connected to the motor rotor, a shear valve connected to the torsion shaft, and a shear valve plate connected to the motor housing and arranged in parallel and spaced apart from the shear valve. The torsion shaft at least includes a fixed section axially passing through the motor rotor and connected to the motor housing, a torsion section axially penetrating and suspended inside the motor rotor, and a shear valve installation section connecting the shear valve.

An acoustic source for use in a well or pipe includes a pulser piston disposed in an acoustic chamber, a linear actuator connected to one side of the pulser piston and a pressure compensator having a pressure outlet in fluid communication with the one side of the pulser piston. The pressure compensator has a sensor for measuring pressure in the well or pipe, a sensor for measuring compensation pressure on the one side of the piston, an hydraulic power source and a controller operatively connected to the hydraulic power source, the well or pipe pressure sensor and the compensation pressure sensor. The controller operates the hydraulic power source such that a predetermined pressure difference between the well or pipe pressure and the compensation pressure is maintained. The controller operates the linear actuator to move the pulser piston to generate acoustic waves having predetermined amplitude, phase, frequency, and waveform.

The invention relates to a hub carrier assembly (1) for a motor vehicle, comprising a hub carrier (2) and a wheel bearing (3) for mounting a wheel hub (4) on the hub carrier (2) for rotation about a wheel-hub axis of rotation (5), wherein a seal (14) which sealingly interacts with a pre-sealing element (15) is arranged between an inner ring (6) and an outer ring (7) of the wheel bearing (3). According to the invention, the pre-sealing element (15) surrounds the outer ring (7) of the wheel bearing (3) and carries a pulse generator (24) of a rotational speed measuring device on a side of the outer ring (7) which is remote from the inner ring (6).

A pulse generator is disclosed. The pulse generator includes a DC source; a plurality of switches, a transformer; and a pulsing output. The pulse generator can be coupled with a plasma chamber. The pulsing output outputs high voltage pulses having a peak-to-peak voltage greater than 1 kV and a voltage portion between consecutive high voltage bipolar pulses that has a negative slope that substantially offsets the voltage reduction on a wafer within a plasma chamber due to an ion current. The resulting voltage at the wafer may be substantially flat between consecutive pulses.

The invention provides an implantable pulse generator, which belongs to the technical field of medical instruments and comprises a main body part, a top cover part and a top cover connecting flange, wherein the main body part comprises a shell and a circuit board, and the circuit board is arranged in the shell; the top cover part comprises an electrode connector, the electrode connector comprises a first connecting ring and a second connecting ring, and the axial directions of the first connecting ring and the second connecting ring are arranged in the length direction of the shell; the top cover connecting flange is connected between the main body part and the top cover part and is provided with a mounting sleeve, and the mounting sleeve is used for accommodating the first connecting ring; the top cover connecting flange is provided with a feed-through connector, the axial direction of the feed-through connector and the axial direction of the mounting sleeve are arranged in parallel, and the feed-through connector is used for connecting the electrode connector and the circuit board. The pulse generator has the effect of reducing the size of the pulse generator.

A high-voltage pulse generation device configured to apply a pulsed high voltage to the space between a pair of discharge electrodes disposed in a laser chamber of a gas laser apparatus includes n transformer cores that form a transformer, where n is a natural number greater than or equal to two, n primary electric circuits of the transformer, the n primary electric circuits each having a first terminal connected to a reference potential and a second terminal connected to a charger, the n primary electric circuits each including one or more primary coils, one or more diodes connected in parallel to the one or more primary coils, and one or more pulse generators connected in parallel to the one or more primary coils, and a secondary electric circuit of the transformer, the secondary electric circuit including a secondary coil and connected to the pair of discharge electrodes.

A method comprises generating, via a pulse generator, a first pressure pulse in a fluid in a pipe and detecting, via a transducer, a first reflected pressure pulse based on the first pressure pulse, wherein the first pressure pulse is reflected by a pipe feature to generate the first reflected pressure pulse. The method comprises generating, with the pulse generator, a second pressure pulse at a later time relative to generating the first pressure pulse, wherein timing of generating of the second pressure pulse is such that the second pressure pulse is superposed with the first reflected pressure pulse such that an amplitude of the second pressure pulse is greater than an amplitude of the first pressure pulse. The method comprises detecting, via the transducer, a second reflected pressure pulse based on the second pressure pulse, and detecting a pipe feature based on the second reflected pressure pulse.

Systems and methods for electroporation are provided. An electroporation system includes a catheter assembly including a first electrode, a second electrode, and a pulse generator coupled to the first and second electrodes. The pulse generator is configured to apply a waveform between the first and second electrodes to perform irreversible electroporation, wherein the waveform includes pulses having a voltage amplitude of 1000 Volts (V) or less and an effective pulse width of 10 microseconds (μs) or more.

A pulse generator is disclosed. The pulse generator includes a DC source; a plurality of switches, a transformer; and a pulsing output. The pulse generator can be coupled with a plasma chamber. The pulsing output outputs high voltage pulses having a peak-to-peak voltage greater than 1 kV and a voltage portion between consecutive high voltage bipolar pulses that has a negative slope that substantially offsets the voltage reduction on a wafer within a plasma chamber due to an ion current. The resulting voltage at the wafer may be substantially flat between consecutive pulses.

A control circuit of a timepiece motor (2), including a bipolar permanent magnet (6), a stator (4) defining two isthmi (12a &12b) and two rest positions for the rotor, and a coil (18) mounted on the stator. The control circuit can determine the position of the rotor at rest. An electric pulse generator (22) for detecting an external magnetic field formed by a circuits for: measuring the electrical current in the coil after an electrical pulse has been triggered, comparing the measured electrical current with a reference current, measuring the time allowing measuring a rise time between triggering of the electrical pulse and the next time the electrical current flowing in the coil reaches the reference current, and processing the rise time to be able to determine whether the measured rise time indicates the presence of a given external magnetic field passing through the two isthmi.

A high frequency chest wall oscillation therapy system includes an air pulse generator. The air pulse generator includes control circuitry and a fluid chamber carrying a fluid. A motor is configured to generate compression and expansion of the fluid in the fluid chamber to generate pressurized fluid. A pressure sensor detects a pressure of the pressurized fluid in the fluid chamber. A garment includes at least one fluid bladder defining a pressurizable chamber adapted to receive the pressurized fluid from the fluid chamber to provide a force of high frequency pressure oscillation to a patient's chest wall.

A pulse generator according to an embodiment of the present invention comprises: a pulse DC generator for providing a pulse DC waveform to a capacitively coupled load; a step waveform generator for providing a step waveform to the capacitively coupled load and which is connected in parallel with the pulse DC generator; and a control part for controlling the pulse DC waveform of the pulse DC generator and the step waveform of the step waveform generator. A waveform applied to the capacitively coupled load comprises a first decrease section in which the voltage decreases from a positive voltage to a negative first voltage, a first maintaining section in which the voltage is maintained at the negative first voltage for a predetermined time, a second decrease section in which the voltage decreases from the first voltage to a second voltage, and a second maintaining section in which the voltage is maintained at the second voltage.

To provide a technique capable of improving an in-plane uniformity of a substrate in plasma processing. A plasma processing apparatus includes a plasma processing chamber; a substrate support; a substrate chuck electrode; at least one ring chuck electrode; a substrate bias electrode; a ring bias electrode; a first voltage pulse generator; a second voltage pulse generator; and a switch configured to switch between a first connection state and a second connection state, the first connection state being a state where the first voltage pulse generator is electrically connected to the substrate bias electrode and the second voltage pulse generator is electrically connected to the ring bias electrode, and the second connection state being a state where the first voltage pulse generator is electrically connected to the ring bias electrode and the second voltage pulse generator is electrically connected to the substrate bias electrode.

The utility model provides an electric pulse generator and medical equipment. The electric pulse generator comprises a voltage regulating circuit, an energy storage capacitor, a charging / discharging change-over switch, an attenuation circuit, a voltage detection module, a current detection module and a monitoring control circuit, the voltage regulating circuit is configured to boost a direct current power supply provided by an external power supply so as to provide a charging power supply for the energy storage capacitor; the charging / discharging change-over switch is configured to conduct the voltage regulating circuit and the energy storage capacitor during charging and conduct the energy storage capacitor and the attenuation circuit during discharging output; the voltage detection module is configured to measure an actual output voltage value and feed back the actual output voltage value to the monitoring control circuit; the current detection module is configured to measure an actual output current value and feed back the actual output current value to the monitoring control circuit; and the monitoring control circuit is configured to control the attenuation amount of the attenuation circuit in a constant voltage or constant current mode so as to realize constant output voltage or current. According to the utility model, a constant-voltage pulse output mode and a constant-current pulse output mode can be provided.

Systems, devices, and methods for stimulating peripheral nerves in the fingers or hand to treat tremor are described. For example, a wearable ring device for delivering electrical stimulation to sensory nerves in a patient's finger can include an annular ring having a plurality of electrodes and a detachable unit having a power source and a pulse generator.

The cyclical suction system generates an intermittent cyclically spaced cyclical suction pressure waveform of a vacuum pressure below atmospheric pressure and a positive pressure above the vacuum pressure. The system includes a flexible inlet tubing connected in fluid communication between a vacuum pump and a suction conduit. A positive pressure pulse generator mechanism intermittently cyclically applies an external force that compresses the segments of the flexible inlet tubing, thereby reducing the internal volume and displacing fluid that can be collected therein, thereby generating positive pressure pulses. Upon withdrawal of the applied external force, the flexible inlet tubing is configured to be able to be forced to return to an uncompressed state, thereby increasing the internal volume while reducing pressure therein until the vacuum pressure ultimately regenerates, thereby minimizing return time and maximizing cycle frequency.

The present invention discloses a dual-pulse test system, which is configured to include: a load inductor, a test power supply is connected to a power device under test through the load inductor; a first freewheeling device, after the power device under test is tested, it forms a freewheeling loop with the load inductor; a pulse generator, which is used to provide the dual pulses required for testing the power device under test; and a failure protection circuit, when the power device under test is in a failure state, it cuts off the test power supply and constructs a freewheeling loop to make the loop current no longer increase. The present invention is configured with a failure protection circuit, which can timely cut off the power supply when the power device under test is in a failure state, and can form a freewheeling loop to realize that the loop current no longer increases, preventing the device from being burned out due to the failure of the power device under test, and playing a protective role.

The application discloses a mandarin fish domestication pool, which comprises a pool body, wherein an oxygenation device, a water inlet and a water outlet are arranged in the pool body, a bait fish breeding frame is arranged below the water inlet, and a feeding device is arranged on the side of the bait fish breeding frame; the feeding device comprises a feeding pipe, a bait temporary storage tank arranged on the upper end of the feeding pipe, a feeding hopper arranged on the upper end of the bait temporary storage tank, cathode ring pieces and anode ring pieces arranged in the feeding pipe, and a pulse generator and a pulse power amplifier connected through wires. The domestication pool is improved, so that live fish feeding, live fish and dead fish or feed proportionate feeding are facilitated, and switching and adjustment are facilitated, thereby improving the convenience and success rate of domestication.