Intracavitary injection catheter device

Abstract

The invention relates to an intracavitary injection catheter device. The intracavitary injection catheter device comprises a hollow catheter body and an injecting mechanism, wherein the injecting mechanism comprises supporting assemblies, an end head, a hollow pull tube and injecting needles; each of the supporting assemblies can be radially expanded and radially compressed and comprises a plurality of supporting rods; each supporting rod is connected between the end head and the catheter body; an injecting needle guide hole allowing each injecting needle to penetrate is formed in each supporting rod; the hollow pull tube penetrates through the catheter body, is fixedly connected with the end head, and is provided with an axial inner cavity; an axial through hole communicating with the axial inner cavity is formed in the center of the end head; and when the hollow pull tube is pulled to a near end, the end head is driven by the hollow pull tube to move relative to the catheter body to control the supporting assemblies to radially expand until each injecting needle can penetrate through the corresponding injecting needle guide hole. According to the intracavitary injection catheter device disclosed by the invention, the supporting assemblies and the hollow pull tube are arranged, so that guide and support can be provided for the injecting needle, the situation that during puncturing, the injecting needle guides the catheter to deflect from a target vascular endothelium position is avoided, and reliable completion of the injecting needle puncturing and medium injecting is facilitated.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to an intracavitary injection catheter device. Background technique [0002] Renal artery sympathetic nerve ablation with the core concept of sympathetic denervation is a method for the treatment of resistant hypertension, including radiofrequency ablation technology and catheter-based non-thermal effect ablation. Among them, for radiofrequency ablation technology, due to the influence of ablation heat, the blood vessel wall in contact with the electrode may be burned, or vasospasm may occur, or complications such as vascular stenosis may occur. For the ablation field based on the non-thermal effect of the catheter, injection Alcohol enters the vessel wall as a neurotoxic medium to ablate sympathetic nerve fibers. [0003] The prior art discloses a catheter system for vessel wall injection and perivascular renal denervation, the cross-section of the distal end 100 of the catheter...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned catheter system, when the injection needle punctures the distal end in the guide tube, the guide tube will be pushed away and deviate from the position of the target vascular endothelium, which will not only increase the possibility that the injection needle deviates from the position of the target vascular endothelium, but also increase the The difficulty of puncture may also cause the injection needle to scratch the inner wall of the blood vessel

Images