69 results about "High-frequency ventilation" patented technology

This invention relates to high-frequency ablation of tissue in the body using a cooled high-frequency electrode connected to a high frequency generator including a computer graphic control system and an automatic controller for control the signal output from the generator, and adapted to display on a real time graphic display a measured parameter related to the ablation process and visually monitor the variation of the parameter of the signal output that is controlled by the controller during the ablation process. In one example, one or more measured parameters are displayed simultaneously to visually interpret the relation of their variation and values. In one example, the displayed one or more parameters can be taken from the list of measured voltage, current, power, impedance, electrode temperature, and tissue temperature related to the ablation process. The graphic display gives the clinician an instantaneous and intuitive feeling for the dynamics and stability of the ablation process for safety and control. This invention relates to monitoring and controlling multiple ground pads to optimally carry return currents during high-frequency tissue ablation, and to prevent of ground-pad skin burns. This invention relates to the use of ultrasound imaging intraoperatively during a tissue ablation procedure. This invention relates to the use of nerve stimulation and blocking during a tissue ablation procedure.

A cardiac signal processing apparatus includes: a unit for acquiring, from a heartbeat sensor, cardiac signals relating to heartbeats of a subject; a low-pass filter for allowing passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; higher harmonic noise acquisition unit for acquiring harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter; a high-pass filter for allowing passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and higher harmonic noise removal unit for removing the harmonic signals of low-frequency noise from the signals output from the high-pass filter. It is thus made possible to remove noise from the cardiac signals and to obtain desirable heartbeat detection characteristics.

An integrated ventilation system is presented. The integrated ventilation system comprises a high frequency ventilation module configured to be operationally coupled to a ventilation system, where the high frequency ventilation module is configured to aid the ventilation system in performing high frequency ventilation. A method for providing high frequency ventilation via use of a high frequency ventilation module, where the high frequency ventilation module is configured to be operationally coupled to a ventilation system, and where the high frequency ventilation module is configured to aid the ventilation system in performing high frequency ventilation, is presented. The method includes creating a vacuum effect at an outlet port of the ventilation system to aid in active exhalation of gas from a patient.

A pneumatic ventilation system delivers high amplitude, low frequency oscillatory flows while maintaining the load impedance at a specified mean pressure, thereby accurately controlling mean airway pressure, oscillation amplitude, and frequency content allowing use in applications to optimize high frequency ventilation protocols in patients. The pneumatic ventilation system includes a pneumatic pressure oscillator based on a proportional solenoid valve to provide forced oscillatory excitations to a respiratory system over a bandwidth suitable for mechanical impedance measurements and high frequency ventilation.

A device is provided for respirating a patient by means of high-frequency ventilation, which has at least one device for setting a desired tidal volume by a user, and which has at least one regulating device for regulating an amplitude of the respiration pressure and / or at least one regulating device for regulating the oscillation frequency on the basis of the tidal volume determined. A corresponding method is provided for regulating a device for respirating a patient by high-frequency ventilation and a method is provided for respirating a patient.

This invention relates to high-frequency ablation of tissue in the body using a cooled high-frequency electrode connected to a high frequency generator including a computer graphic control system and an automatic controller for control the signal output from the generator, and adapted to display on a real time graphic display a measured parameter related to the ablation process and visually monitor the variation of the parameter of the signal output that is controlled by the controller during the ablation process. In one example, one or more measured parameters are displayed simultaneously to visually interpret the relation of their variation and values. In one example, the displayed one or more parameters can be taken from the list of measured voltage, current, power, impedance, electrode temperature, and tissue temperature related to the ablation process. The graphic display gives the clinician an instantaneous and intuitive feeling for the dynamics and stability of the ablation process for safety and control. This invention relates to monitoring and controlling multiple ground pads to optimally carry return currents during high-frequency tissue ablation, and to prevent of ground-pad skin burns. This invention relates to the use of ultrasound imaging intraoperatively during a tissue ablation procedure. This invention relates to the use of nerve stimulation and blocking during a tissue ablation procedure.

An injector comprising one or more piezoelectric driving stacks wherein a flow control member of the injector is driven directly by the one or more piezoelectric stacks without additional amplification means or interposing elements while a flow area of the nozzle is variably adjustable to deliver controlled flow rates in a desired flow profile to improve engine performance and reduce emissions. The injector is configured to support required flow rates with minimal linear movement of the flow control member. The injector and drive electronics are configured to deliver higher frequency operation and response with increased operational stability due to minimal response lag.

Selective ionization at atmospheric or near atmospheric pressure of a sample diluted in air is provided in multiple steps. Initially, components of air and / or other gas are ionized to generate reactive ions. The reactive ions are then filtered using a high frequency filter to yield selected reactive ions. Thereafter, the selected reactive ions are reacted with sample molecules of a sample being analyzed in a charge transfer process. Depending on the properties of the sample molecules, the filter may select some reactive ions to enter the sample zone and block others entirely thus controlling ion chemistry and charge transfer yields in the sample zone. The described system is directed to controlling ions at the ion source level, using a high frequency filter technique, in connection with subsequent analysis. The method generates the ions of choice for subsequent analysis in such platforms as ion mobility and differential mobility spectrometers.

A method for tuning a combustor of a gas turbine engine based on one or more monitored operating conditions is provided. One or more operating conditions of the gas turbine engine are monitored. The monitored operating conditions may include, for example, a low frequency tone, a high frequency tone, and a ratio of the low frequency tone to the high frequency tone. It is determined whether the ratio of the low frequency tone to the high frequency tone is within a first predefined normal range. If the ratio of the low frequency tone to the high frequency tone is within the first predefined normal range, a determination is made not to tune the gas turbine engine. But, if the ratio of the low frequency tone to the high frequency tone is not within the first predefined normal range, a determination is made to tune the gas turbine engine.

The present invention provides a breathing apparatus (1) for providing high frequency oscillatory ventilation to a patient (3) by supplying breathing gas to the patient according to an oscillating pressure profile oscillating between a positive pressure and a negative pressure. The breathing apparatus comprises a patient circuit including an inspiratory line (5) and an expiratory line (9). It further comprises an inspiration valve (17) for regulating a flow of pressurised breathing gas into the inspiration line, and a control unit (21) for controlling the inspiration valve. The control unit is operable to cause the oscillating pressure profile by controlling the inspiration valve to oscillate between a top flow position in which the flow of breathing gas through the inspiration valve assumes a top flow value, and a minimum flow position in which the flow through the inspiration valve assumes a minimum flow value.

A cardiac signal processing apparatus includes: a unit for acquiring, from a heartbeat sensor, cardiac signals relating to heartbeats of a subject; a low-pass filter for allowing passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; higher harmonic noise acquisition unit for acquiring harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter; a high-pass filter for allowing passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and higher harmonic noise removal unit for removing the harmonic signals of low-frequency noise from the signals output from the high-pass filter. It is thus made possible to remove noise from the cardiac signals and to obtain desirable heartbeat detection characteristics.

An integrated ventilation system is presented. The integrated ventilation system includes a high frequency ventilation module configured to be operationally coupled to a ventilation system, where the high frequency ventilation module is configured to aid the ventilation system in performing high frequency ventilation. A method for providing high frequency ventilation via use of a high frequency ventilation module, where the high frequency ventilation module is configured to be operationally coupled to a ventilation system, and where the high frequency ventilation module is configured to aid the ventilation system in performing high frequency ventilation, is presented. The method includes creating a vacuum effect at an outlet port of the ventilation system to aid in active exhalation of gas from a patient.

A ventilation system for providing patient-triggered support ventilation to a spontaneously breathing patient during ongoing HFV ventilation has a pneumatic unit for delivery of breathing gas to the patient in response to an effort to breathe by the patient, a control computer for controlling the delivery of breathing gas by said pneumatic unit, and an oscillator for superimposing high frequency oscillation onto the breathing gas. The system further includes a bioelectric sensor that measures a bioelectric signal indicative of the patient's efforts to breathe, and the control computer is configured to control the delivery of breathing gas in response to the patient's effort to breathe, based on this bioelectric signal. The ventilation system is hence designed for neurally triggered support ventilation during ongoing high frequency ventilation, HFV, which makes the trigger mechanism of the ventilation system more precise and robust compared to trigger mechanisms of known ventilation systems capable of providing support ventilation during ongoing HFV ventilation.

The invention belongs to the technical field of medical equipment, and discloses a visual 3D endoscope capable of guiding tracheal intubation. The visual 3D endoscope capable of guiding the tracheal intubation is provided with an endoscope body, wherein an exchange tube core guide groove is formed in the back side of the endoscope body, and the exchange tube core guide groove is connected with a base of the 3D endoscope; a sucking and flushing hole is formed in the ventral side of the endoscope body, and the sucking and flushing hole is distributed at the opposite side of the exchange tube core guide groove; two miniature cameras, two light sources and a micro microphone are inlaid on the front end surface of the endoscope body, the two miniature cameras are symmetrically arranged on two sides of the joint of the sucking and flushing hole and the exchange tube core guide groove, the two light sources are symmetrically distributed at the upper parts of the miniature cameras and the lower part of the exchange tube core guide groove, and the miniature microphone is arranged at the joint of the miniature camera on the left side and the sucking and flushing hole. The visual 3D endoscope capable of guiding the tracheal intubation integrates the current mainstream tracheal intubation devices and ideas including the laryngoscope, the visible laryngoscope, the light wand, the bronchofiberscope, the visual tube core, high-frequency ventilation and the like.

The invention discloses a depiction method of a carbonate rock fracture cavity internal structure. The method comprises steps that based on existing geological knowledge, seismic data corresponding to a fracture cavity is acquired; for the seismic data, frequency spectrum decomposition is employed, and the high frequency information is utilized to depict the internal structure of the fracture cavity.