Pre-dilating guide wire and preparation method thereof

Abstract

The invention discloses a guide wire. The guide wire comprises a far end, a near end and a core wire, the core wire is positioned in a guide wire body and extends from the near end to the far end, a dilating portion is arranged on the core wire, the diameter of the dilating portion is larger than that of the core wire, and a safety net is arranged at a head end, positioned at the far end, of the core wire and is fixedly connected with the head end. The invention further discloses a preparation method of the guide wire. By additionally arranging the safety net at the head end, positioned at the far end, of the core wire, loss of torsion / torque transmission of the guide wire is reduced, and softness and non-deformability of the far end of the guide wire are guaranteed while the phenomenon of 'tail whipping' is eliminated; by arranging the dilating portion on the guide wire, a narrow portion can be pre-dilated by a radial support effect, and an inner cavity of the narrow portion can be dilated to allow a balloon to pass through conveniently. The dilating portion of the pre-dilating guide wire is perfectly round, smooth and soft and cannot cause wounds to blood vessels.

Description

technical field [0001] The present application relates to the technical field of medical devices, in particular to a pre-expanded guide wire for intravascular interventional therapy and a preparation method thereof. Background technique [0002] Cardiovascular and cerebrovascular diseases are the number one killer of health in modern society. The number of people who die from cardiovascular and cerebrovascular diseases in the world is as high as 15 million every year, ranking first among various causes of death. Interventional therapy is currently the main means of clinical treatment of coronary atherosclerotic heart disease. Interventional implantation of balloon catheters or stents can effectively treat stenotic lesions, restore normal blood circulation, and ensure blood supply. [0003] Guide wire is an indispensable supporting product in interventional medical devices, which has been widely used in medical interventional operations, and plays the role of guide rail and p...

AI Technical Summary

Problems solved by technology

[0004] The existing guide wire is mainly composed of a core wire, a sheath and a coating. In order to ensure the rigidity of the proximal end of the guide wire, increase the flexibility of the distal end (head end) and facilitate the passage of tortuous blood vessels, the overall diameter of the core wire is from the proximal end to the From the middle section to the distal end, the diameter decreases sequentially, but the reduction in the diameter of the core wire can make the head end softer, but at the same time greatly reduces the cross-sectional area of ​​the core wire at the head end, resulting in a serious loss of torque and torque of the guide wire. Torque cannot be transferred 1:1 when rotating the proximal end of the guidewire

The torque is accumulated somewhere in the distal end. When the guide wire continues to rotate, the torque is released suddenly, causing the distal end of the guide wire to jump and flick, which affects the control of the direction of the distal end of the guide wire in the blood vessel.

Another important performance of the guide wire is the ability to maintain integrity during the manipulation process. In clinical applications, the guide wire is easy to get stuck in the stenosis of the blood vessel or other places. At this time, it is generally necessary to pull the proximal end of the guide wire to make it safely withdrawn. If the anti-deformation ability of the guide wire is insufficient, it is easy to cause the head end to be elongated, deformed or broken, which will affect the safety of the operation

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