14results about How to "Improve ablation effect" patented technology

The invention relates to the field of scavengers, in particular to a copper-based urea crystal scavenger for a vehicle and a preparation method of the copper-based urea crystal scavenger. The automotive copper-based urea crystal scavenger provided by the invention is prepared from the following raw materials: a copper-based catalyst, a surfactant, a foaming agent, a dispersing agent, a reducing pigment and deionized water, wherein the copper-based catalyst comprises copper acetate, the surfactant comprises AEO-10 and MOA-3PK, and the reducing pigment comprises methylene blue; the prepared automotive copper-based urea crystal scavenger is convenient to use, excellent in urea crystal melting effect and short in effective mileage, the environmental protection property of automobile running can be obviously improved after the automotive copper-based urea crystal scavenger is used, and meanwhile the effect of reducing the use cost of an automobile is remarkable.

The invention relates to an ablation catheter. The ablation catheter comprises an outer tube, a bearing frame and a first ablation piece. The bearing frame is arranged at the far end of the outer tube, the bearing frame is of a support structure capable of being contracted and expanded in the radial direction, the bearing frame comprises a plurality of bearing components, and the bearing components are arranged around the axis of the outer tube at intervals in the circumferential direction; a linear attaching face is formed on the outer surface of each bearing component and used for being attached to a target ablation area to conduct linear ablation, and the first ablation pieces are correspondingly arranged on the bearing components and used for being connected with an external energy source so as to transmit ablation energy output by the external energy source to the target ablation area.

This invention relates to the field of medical ablation technology, and discloses a method and system for controlling the temperature of an ablation electrode. The method includes: during the ablation process, acquiring in real time the output power of the ablation host and the biological tissue impedance between the ablation electrode and the lesion tissue monitored by the ablation host; calculating the real-time heat generation power of the ablation electrode acting on the lesion tissue; acquiring the inlet temperature, outlet temperature, and instantaneous flow rate of the cooling medium flowing through the internal cooling channel of the ablation electrode, and quantifying the real-time heat dissipation power of the cooling medium according to the heat transfer relationship of the medium; determining thermal state parameters based on the real-time difference between the real-time heat generation power and the real-time heat dissipation power, the thermal state parameters reflecting the heat accumulation trend; dynamically adjusting the flow rate of the cooling medium using a feedforward method; and in the feedforward dynamic adjustment, collecting and associating successful ablation parameter combinations of biological tissue to construct a self-learning parameter library for the ablation electrode. This invention can improve the accuracy of ablation electrode temperature control.

The invention discloses a radiofrequency ablation catheter and a radiofrequency ablation system.The radiofrequency ablation catheter comprises a center rod, a plurality of supporting rods and an electrode set, the multiple supporting rods are arranged around the center rod and form a cage-shaped structure, and the supporting rods are made of polyether block amide; the electrode group comprises a plurality of electrodes, the plurality of electrodes at least comprise a positive electrode and a negative electrode, each supporting rod is connected with one electrode group, and each electrode in the electrode group is at least partially exposed. The ablation effect of the radiofrequency ablation catheter can be improved through the design of the supporting rod material and the electrode set.

This invention discloses a microwave ablation electrode, relating to the field of medical device technology. It mainly includes a main needle body, whose working end can release microwave energy to achieve microwave ablation. The main needle body is equipped with a non-working end circulating cooling structure and a working end liquid injection structure. The non-working end circulating cooling structure allows a cooling medium to reach the non-working end of the main needle body to cool the non-working end and surrounding tissue, and also allows for the return flow of the cooling medium. The working end liquid injection structure allows a cooling medium to reach the working end of the main needle body to cool the working end and surrounding tissue, and also allows the cooling medium to be injected into the lesion tissue, absorbing microwave energy to form steam, achieving steam thermal ablation. This invention achieves dual ablation through steam thermal ablation and microwave ablation, improving the ablation effect, reducing the temperature of the working end of the microwave ablation electrode, and increasing the moisture content of the tissue surrounding the working end, thus reducing carbonization of the lesion tissue.

The invention relates to the field of medical electrophysiology mapping and ablation catheters, in particular to a deformable closed annular catheter which comprises a head end structure, a core tube section and a sheath tube section, the head end structure comprises a combination part and a plurality of supporting arms, each supporting arm comprises a supporting component wire and an isolating layer, a merging arm is formed on the side, close to the combination part, of every two adjacent supporting arms, and the merging arms are connected with the core tube section. Deformation sections are arranged in the middles of the supporting arms. Through relative movement of the core tube section and the sheath tube section, control over the outer diameter of the head end structure is achieved, the head end structures of different sizes are formed so as to adapt to catheters in different use states and different tissue positions, meanwhile, through mutual traction of a plurality of supporting component wires and further arrangement of the deformation section, the head end structure is more flexible to use. The head end structure can keep a stable structure appearance in any state, the distance between electrodes arranged on the head end structure and the stability of electrode attaching can be ensured, then a closed annular ablation ring can be rapidly and stably formed, the head end structure can adapt to positions of different sizes to be used, and the ablation efficiency and the ablation effect are improved.

The application relates to a high-voltage pulse electric field ablation device and method, and belongs to the technical field of medical instruments, which solves the problem of long pulse edge and pulse width generated by an existing high-voltage fast switch. The device comprises a high-voltage output module, a capacitor and a control unit. The high-voltage output module comprises a first branch, an additional branch and a second branch which are connected in parallel between a direct-current high-voltage power supply and a grounding end in sequence. The first branch comprises first and second power switches which are connected in series. The second branch comprises fifth and sixth power switches which are connected in series. The additional branch comprises third and fourth power switches which are connected in series. The capacitor is connected between a first node between the first and second power switches and a second node between the third and fourth power switches. The first to sixth power switches are opened and closed to generate a bipolar high-voltage pulse with picosecond or nanosecond rising and falling edges and nanosecond pulse width. The amplitude, rising time, falling time, frequency, pulse width, positive and negative pulse time difference and pulse number of the pulse can be adjusted. The device realizes super-fast pulse rising and falling edges and super-short pulse width.

The invention discloses a flushing suction ablation device, which relates to the field of medical apparatus and instruments, and comprises a body which is a hollow cylindrical shell, and a three-way pipe structure is arranged on the side wall of the body; the rotary valve is a cylinder and is arranged in the body in a sleeved mode, a three-way hole is formed in the rotary valve and is matched with the three-way pipe on the side wall of the body, a poking piece conforming to human engineering is arranged on one end face of the rotary valve, and the poking piece is poked to switch different through holes in the rotary valve to be communicated with the three-way pipe; according to the scheme, disassembly, washing and dredging can be conveniently and rapidly achieved in a threaded fit mode, meanwhile, attraction force and water washing force can be adjusted in a stepless mode, pipe blocking can be prevented, water leakage can be prevented, and the operation pipe is a round pipe and is inserted into one through pipe in the three-way pipe structure of the body. Meanwhile, the suction force and the flushing force can be freely adjusted, and the ablation effect is greatly improved.

The invention provides a pulsed electric field generation device, equipment and a related method, and relates to the technical field of medical instruments. The pulse electric field generating device comprises a first pulse generating circuit used for generating a first polarity pulse; the second pulse generation circuit is used for generating a second polarity pulse; the first pulse generating circuit and the second pulse generating circuit are both connected to the applying pieces, and in the working state, the first polarity pulse and the second polarity pulse are both applied to any applying piece in the at least one applying piece; the polarities of the first polarity pulse and the second polarity pulse are opposite, and the duration of the first polarity pulse and the duration of the second polarity pulse are partially overlapped. Therefore, the ablation effect of the pulse can be improved.

This application discloses a user-friendly catheter device and ablation apparatus, relating to the field of medical device technology, including a catheter assembly, a control handle, an injection chamber, and a seal. The catheter assembly includes an inner tube, an outer tube, and a balloon. The gap between the inner and outer tubes forms a media channel. The distal end of the balloon is connected to the inner tube, and the proximal end of the balloon is connected to the outer tube. The control handle is connected to the proximal end of the catheter assembly and includes a control component connected to the inner tube. The inner tube can move axially relative to the outer tube under the action of the control component to adjust the balloon's switching between a contraction and inflation configuration. The injection chamber is located within the control handle, communicating with the proximal end of the media channel, and is sleeved outside the inner tube. The seal blocks the injection chamber and has a fixing hole that accommodates axial movement of the inner tube relative to the injection chamber. This user-friendly catheter device and ablation apparatus solves the problem of simultaneously adjusting the deformation of the catheter balloon and maintaining sealing stability during multiple movements.

The present invention provides a cryoablation system, including: a gas source, a balloon, a precooling device, and a condensation chamber and a condensation structure; the inlet of the condensation chamber is used to access the gas source gas provided by the gas source, the low-temperature environment formed in the condensation chamber can condense the target gas in the gas source gas into a liquid cryogen, and collect the liquid cryogen at the bottom of the condensation chamber, the outlet of the condensation chamber is used to discharge the collected liquid cryogen, so that the discharged liquid cryogen can be precooled by the precooling device, and the condensation structure is used to form the low-temperature environment in the condensation chamber and capture water vapor in the condensation chamber. The present invention can improve the purity of the target gas, such as N2O gas, and eliminate or reduce the phenomenon of balloon blockage or shrinkage, so as to achieve a better ablation effect.

This invention provides a pulsed electric field ablation system, including an ablation catheter and an ablation device, with the ablation catheter connected to the ablation device. The ablation catheter includes an operating handle, a catheter body, and a treatment head. The operating handle is located at the proximal end of the catheter body, and the treatment head is located at the distal end of the catheter body. The proximal end of the operating handle is connected to the ablation device via a tail wire. The ablation device includes a control system that can control and switch each set of electrodes for impedance measurement or ablation. By measuring voltage and current values ​​using AC signals, the impedance between electrodes is calculated. The impedance value is used to determine whether the electrodes are in good contact with the myocardial tissue. Good contact improves the effectiveness of ablation energy reaching the target point. Different electrode pairings are achieved through a switching circuit. Then, the optimal electrode combination is selected for discharge based on the judgment, forming a transverse, vertical, oblique, and intermittent discharge electric field, thus obtaining the optimal surgical ablation plan for different pulmonary vein morphologies.

The radiofrequency ablation guide wire comprises an inner guide wire assembly, an outer guide wire assembly arranged outside the inner guide wire assembly in a sleeving mode, an annular electrode array installed at the top end of the inner guide wire assembly and a control system connected with the inner guide wire assembly, and the inner guide wire assembly comprises an inner guide wire and an expandable anchoring device installed on the side wall of the inner guide wire; the internal guide wire comprises a guide wire front end, a guide wire middle section connected with the guide wire front end and a guide wire rear end connected with the guide wire middle section; the expandable anchoring device can be expanded and firmly fixed on myocardial tissue, the control system can control the annular electrode array to achieve ablation, the front end of a guide wire in the inner guide wire assembly is soft and used for making contact with the tissue, the middle section of the guide wire is used for supporting, the rear end of the guide wire is used for being held by a doctor, and work division is clear. Compared with the prior art, a better ablation effect can be achieved for some positions, and damage to tissue is reduced.

The application relates to a left auricle occlusion and ablation device. The left auricle occlusion and ablation device comprises an anchoring disc which is a radially telescopic stent structure, and a sealing disc which is a radially telescopic stent structure and is arranged at the proximal end of the anchoring disc; the sealing disc is made of a conductive material, and the sealing disc as a whole serves as a first conductive part for transmitting ablation energy or collecting tissue physiological signals. The anchoring disc is released in the left auricle and can anchor the tissue inner wall of the left auricle, and the sealing disc is released at the entrance of the left auricle so as to occlude the entrance of the left auricle and occlude thrombus in the interior of the left auricle, thereby effectively preventing the thrombus from entering the left atrium. Meanwhile, the sealing disc is conductive as a whole and transmits ablation energy, and ablation is performed on the left auricle mouth, which is more conducive to forming a complete annular ablation zone at the mouth, thereby facilitating complete electrical isolation of the left auricle from the left atrium at the left auricle mouth, and greatly improving the ablation effect.