Medical interventional needle assembly and medical interventional catheter

Abstract

The invention provides a medical interventional needle assembly and a medical interventional catheter. The medical interventional needle assembly includes a first pipe section, a second pipe section, an electrical conductor and a metal needle. The second pipe section is connected to the distal end of the first pipe section, and the metal needle Disposed in the second pipe section, at least a portion of the electrical conductor is braided and formed in the pipe wall of the first pipe section. With this configuration, the electrical conductors braided and formed in the pipe wall of the first pipe section will not affect the internal space of the first pipe section, ensuring the flow of salt water, reducing the perfusion pressure, and avoiding the risk of the electrical conductors being broken by being washed away by salt water. In addition, weaving electrical conductors into the pipe wall can also increase the strength of the pipe and prevent it from buckling or breaking.

Description

Technical field [0001] The present invention relates to the technical field of medical devices, and in particular to a medical interventional needle assembly and a medical interventional catheter. Background technique [0002] Radiofrequency (RF) ablation of the heart and other tissues is a well-known method for creating thermally damaging ablation lesions at the tips of electrodes. Tissue that is heated beyond a threshold of about 50 to 55°C in the ablated area is irreversibly damaged, thereby achieving the ablation effect. Direct resistive heating of a small area at the electrode-tissue interface is the main source of heat in radiofrequency ablation. Energy absorption is related to the square of the current density and inversely proportional to tissue conductivity. In addition, thermal conduction is another source of ablation energy. Hypertrophic cardiomyopathy will reduce the amount of blood pumped by the heart to the whole body, eventually leading to heart failure; at t...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the temperature sensor line and the radio frequency wire extend from the far end to the proximal end in the saline tube, occupying the space of the saline tube, which is likely to cause a decrease in the saline perfusion flow rate or an increase in the perfusion pressure

Moreover, both the temperature sensor line and the temperature sensing point of the temperature sensor are placed inside the needle, and are fixed or not fixed with glue, which will cause the glue to fall off or the contact point of the temperature sensor to be separated from the inner wall of the needle, resulting in the temperature sensor not being able to accurately sense the temperature, and the saline solution being perfused. During the process, the RF wires and temperature sensor wires will be washed continuously, and the RF wires or temperature sensor wires are not restrained in the saline pipe, so there is a risk of wire breakage

[0005] On the other hand, the existing connection method between the ablation needle and the catheter is that the ablation needle is set inside the catheter, so that the area where the ablation needle is connected to the catheter cannot perform the ablation function, and if this area is reduced as much as possible, it may cause both The connection is not firm, and there are safety hazards such as loosening

[0006] For other similar medical interventional needle assemblies, the above-mentioned problems also exist, such as interventional myocardial injection needles, etc. In order to accurately locate the injection position, a magnetic positioning sensor can be set at the injection needle, and the electric wire of the magnetic positioning sensor There will also be problems such as being easily broken by fluid washing or the magnetic positioning sensor is separated from the injection needle.

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