Vascular piercer

Abstract

The invention discloses a blood vessel puncture outfit comprising a conduit sheath and an expander. The expander comprises an expander straight section; the conduit sheath is formed by a conduit sheath straight section and an interference part connected with the conduit sheath; the diameter of the external edge of the interference part is smaller than the external diameter of the expander straight section; and when the expander is inserted into the conduit sheath, the interference part is in interference cooperation with the expander. A gap cannot be formed when the blood vessel puncture outfit is bent; resistance of the conduit sheath inserted into the blood vessel can be reduced, so projected or continuous folding can be avoided; and risk of damage to the blood vessel can be avoided.

Description

technical field [0001] The invention relates to the field of disposable medical devices, in particular to a blood vessel puncture device used for percutaneous interventional operations to introduce guide wires, surgical instruments and medical devices into a patient's vascular system (especially an artery). Background technique [0002] The rapid development of modern medical technology has produced many methods of percutaneous interventional procedures, among which percutaneous transluminal coronary angioplasty (PTCA), X-ray angiography and other similar procedures are frequently used. There are many technologies that can introduce related medical devices into the human vascular system, among which the Seldinger technology is widely used. [0003] In the Seldinger technique, a puncture needle is first used to make a small opening on the artery or vein, then a guide wire is introduced into the artery or vein through the lumen of the puncture needle, and the puncture needle i...

AI Technical Summary

Problems solved by technology

[0006] 1. Please combine figure 2 , when the catheter sheath 1 and the dilator 2 enter the blood vessel 4 at the same time, they will naturally bend along the direction of the blood vessel 4 after passing through the puncture site. At this time, a gap 5 appears at the transition site 3 between the two, and its sharp edge has the risk of damaging the vessel wall , at the same time, it will increase the resistance during penetration, resulting in inconvenience for the operator

[0007] 2. Please combine image 3 , when the catheter sheath 1 and the dilator 2 enter the blood vessel 4 at the same time, they will be subject to certain resistance. If there is a problem with the size of the transition part 3 of the two or the catheter sheath 1 is too thin, there will be a convex deformation or even a continuous folded shape6 , so that the outer diameter of the introducer sheath 1 is significantly increased, which will generate greater resistance and even cause the introducer sheath 1 to fail to enter the blood vessel 4, resulting in failure of the operation

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