5results about How to "Improve ablation effect" patented technology

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.

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.

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.

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 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.