Extendable catheter sheath and interventional device conveying device

Abstract

The invention discloses an extendable catheter sheath and an interventional device conveying device. The extendable catheter sheath comprises a tube wall, the tube wall is in a rolling wall structure, the cross section of the tube wall is in a coiling shape, and the tube wall has an expanding state for expanding the rolling wall structure of the corresponding part and a pre-forming state for automatically recovering the rolling structure. The catheter sheath has a specific cross-section shape, the shape (the cross section) of the catheter sheath is changed on the position, where an interventional device goes by, according to the external size of the interventional device when the interventional device is conveyed, and the catheter sheath is recovered to the original pre-forming state through the self-elasticity after the interventional device passes by, so that the catheter sheath is favorable for penetrating a thinner blood vessel, the falling of a calcification part is avoided, and the risk of the operation is reduced.

Description

technical field [0001] The invention relates to the technical field of interventional instruments, in particular to an introducer sheath and an interventional instrument delivery device using the introducer sheath. Background technique [0002] With the wide application of endovascular interventional therapy in the world, its complications are becoming more and more obvious. Taking interventional aortic valve and pulmonary valve replacement surgery as an example, since the femoral artery or femoral vein needs to be punctured during the operation, and then the delivery sheath loaded with the valve is delivered through the femoral artery or femoral vein, at this time, it needs to be inserted into the inferior vena cava An introducer sheath is first placed at the opening to protect the inferior vena cava. Since the size of the current aortic valve or pulmonary valve delivery sheath is between 16F-24F, direct delivery of the sheath can easily lead to vascular dissection or even...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the outer diameter of the introducer sheath is fixed, so it cannot cover the diameter of the inferior vena cava of all patients and the aortic vessel with calcification on the vessel wall, especially the inferior vena cava of patients in China and other Asian countries becomes If it is too small to adapt to the catheter sheath, it will reduce the protection of the blood vessel at the puncture site; even some elderly patients have calcification in the aorta, and the insertion of a large-diameter catheter sheath may cause the calcified plate to fall off

And the introducer sheath is the first device to be put into the blood vessel and the last to be withdrawn. It stays in the blood vessel for a long time. If the large-diameter blood vessel is dilated for a long time, it will easily cause vasospasm, which threatens to increase the chance of surgical complications.

Images