34results about How to "Uniform ablation" patented technology

A catheter assembly for treatment of cardiac arrhythmia. The catheter assembly includes a catheter body and an ablative energy source. The catheter body includes a proximal portion, an intermediate portion, and a distal portion. The intermediate portion extends from the proximal portion and defines a longitudinal axis. The distal portion extends from the intermediate portion and includes an ablation section and a tip. The ablation section forms a loop defining a diameter greater than an outer dimension of a pulmonary vein ostium. The tip extends distally from the ablation section and is configured to locate a pulmonary vein. Finally, the ablative energy source is associated with the ablation section. With this configuration, upon activation of the energy source, the ablation section ablates a desired lesion pattern. In one preferred embodiment, the ablation section forms a distally decreasing radius helix, whereas the tip includes a relatively linear leader section. With this one preferred configuration, the tip readily locates a pulmonary vein and guides the ablation section to a seated relationship about a pulmonary vein ostium (or extra-ostial).

A catheter assembly for treatment of cardiac arrhythmia. The catheter assembly includes a catheter body and an ablative energy source. The catheter body includes a proximal portion, an intermediate portion, and a distal portion. The intermediate portion extends from the proximal portion and defines a longitudinal axis. The distal portion extends from the intermediate portion and includes an ablation section and a tip. The ablation section forms a loop defining a diameter greater than an outer dimension of a pulmonary vein ostium. The tip extends distally from the ablation section and is configured to locate a pulmonary vein. Finally, the ablative energy source is associated with the ablation section. With this configuration, upon activation of the energy source, the ablation section ablates a desired lesion pattern. In one preferred embodiment, the ablation section forms a distally decreasing radius helix, whereas the tip includes a relatively linear leader section. With this one preferred configuration, the tip readily locates a pulmonary vein and guides the ablation section to a seated relationship about a pulmonary vein ostium (or extra-ostial).

An energy delivery device for treating a patient includes a probe body and a plurality of elongate electrode elements that extend radially away from the probe body when deployed into tissue of the patient. The electrode elements are adapted to receive electrical treatment energy such as irreversible electroporation (IRE) pulses from an energy source. In one embodiment, each electrode element has a longitudinally varying electrical resistance at the electrode-tissue interface along the electrode so as to provide a uniform electric field along the length of the electrode. The uniform electric field allows a more uniform ablation of tissue within a treatment zone.

The present invention is pulse laser deposition (PLD) process for preparing p-type compound CuAlS2 in chalcopyrite structure and transparent doped conducting film. The PLD process prepares p-type compound CuAlS2 or doped film on the substrate of quartz glass, common glass or Si chip by using the compound block obtained through solid phase reaction and SPS sintering or no-pressure sintering as thetarget and under proper conditions of atmospheric pressure, substrate temperature, and laser strength and frequency. The prepared CuAlS2 film has p-type conductivity, high conductivity, high visible light transparency and other excellent optoelectronic performance, and may find its broad application foreground in electronics and optoelectronics.

A ratio of reversible electroporation and irreversible electroporation may be controlled by selecting a symmetric waveform or asymmetric waveform to either minimize or enhance irreversible effects on cells in the target tissue. Combined reversible and irreversible electroporation includes inserting one or more therapeutic electrodes into a target tissue, introducing an electroporation compound into the target tissue, selecting a pulse waveform that is either 1) asymmetric bipolar that has positive and negative pulses with different durations, or 2) symmetric bipolar that has positive and negative pulses with the same duration, and delivering to the target tissue a series of electrical pulses having the selected pulse waveform.

The invention discloses a triggering vacuum switch with two pairs of rod pole structures along the surface breakdown; the triggering vacuum switch adopts a three-stage structure, including an upper corrugated ceramic shell, a lower corrugated ceramic shell, and a middle metal shield, which are arranged on the metal shield The upper and lower electrodes in the cover, the trigger electrode, the upper electrode metal connecting rod, the upper electrode flange, the lower electrode metal connecting rod and the lower electrode flange; the upper electrode flange is connected with the upper corrugated ceramic shell, and the lower The electrode flange is connected to the lower corrugated ceramic shell, and then together with the metal shield to form a closed shell; the upper electrode flange is connected through the upper corrugated ceramic shell, and the lower electrode flange is connected through the lower corrugated ceramic shell. Effectively improve the creepage distance between the upper electrode flange and the lower electrode flange. The invention has high working voltage, large arc burning area, high transfer coulomb quantity in conduction process, long working life under high current, uniform electrode ablation degree, and high power frequency withstand voltage level after arc extinguishing.

The invention relates to a multi-stage magnetic field straight pipe magnetic filtration and pulsed bias compounded electrical arc ion plating method, and belongs to the technical field of material surface treatments. In the prior art, plasma transmission efficiency is low and pulsed bias can not completely remove large particles due to applying of magnetic filtration on an arc source. A purpose of the present invention is to solve problems in the prior art. The method comprises: 1, connecting a workpiece to a pulsed bias power supply, connecting an electrical arc ion plating target source to a target power supply, and connecting a multi-stage magnetic field straight pipe magnetic filtration device in front of the target source; 2, carrying out thin film deposition, wherein work gas is introduced until achieving 0.01-10 Pa when a pressure in a vacuum chamber is less than 10<-2> Pa, the pulsed bias power supply is opened, a pulsed bias amplitude value, frequency and a duty ratio are adjusted, the target power supply is opened, plasma is generated, the multi-stage magnetic field straight pipe magnetic filtration device is opened, removal of large particles and efficient transmission of the plasma in the magnetic filtration device are achieved, process parameters are adjusted, and a thin film with no large particle defect is rapidly produced; and 3, adopting a single-stage magnetic field to combine direct current / pulsed bias to obtain a thin film with a certain thickness.

The invention provides a vacuum cathode arc source with discharge arc spots covering the target surface. Connection; the target base assembly is composed of a cooling water channel component and a magnetic circuit component stacked up and down; the cooling water channel component is a flat cooling water channel including a cooling water channel metal upper cover sheet and a cooling water channel metal bottom plate, and is provided with an inlet and an outlet; the magnetic circuit component is composed of magnetic poles The upper and lower end faces of a plurality of small cylindrical magnets are vertically arranged on a target base plate with the same pole and the same direction (the same magnetic pole faces the same direction). The invention has the following advantages: the discharge area is greatly increased, allowing to increase the target current several times, which is beneficial to greatly improve the deposition rate; the distributed arc discharge discharges almost on the entire target surface, so that the target surface is ablated more uniformly and the utilization rate of the target material is improved. ; Conducive to the heat conduction of the target surface and the water cooling, which is beneficial to improve the quality of the film.

The invention relates to a two-electrode gas switch. The two-electrode gas switch comprises a first electrode base, a second electrode base, and two electrodes which are used for forming electrode gaps. The first electrode base is tubular. The electrode gaps are arranged in the internal cavity of the first electrode base. The radial side wall of the first electrode base is provided with a conductive connection structure which is used for enabling the first electrode base to be conductively connected with an external object. The conductive connection structure is arranged at one side, which is close to the second electrode base, of the electrode gaps in the axial direction of the first electrode base. The direction of current flowing through the radial side wall of the first electrode base is opposite to the direction of current flowing through the electrode gaps when current flows. The electromagnetic force generated by current flowing through the radial side wall of the first electrode base affects on the discharge arcs of the two electrode gaps to generate hooping constraint force on the discharge arcs of the two electrode gaps so that heat, the arcs and graphite particles are enabled to be concentrated, more graphite particles are enabled to be oxidized into gas, pollution of the graphite particles to insulating cylinders can be reduced and the service life of the switch can be prolonged.

The invention discloses a device for removing bulging fat in eyes, which comprises a central controller (6), a cooling fluid control part (3), a heating control part (4), a radio frequency control part (5) and a radio frequency handle (1 ); wherein, the central controller (6) is respectively connected to the cooling fluid control part (3), the heating control part (4), the radio frequency handle (1), and the radio frequency control part (5), for receiving the reservation program and the radio frequency handle (1 ) the temperature feedback signal of the temperature sensor (133); and according to the needs of the predetermined program and the temperature feedback signal, the corresponding control instructions for the cooling fluid, heating components and radio frequency signals are sent to the cooling fluid control part (3), heating The control unit (4) and the radio frequency control unit (5) are used to realize the control of corresponding components.