CN-121987921-A - Catheter assembly for coronary intervention treatment

CN121987921ACN 121987921 ACN121987921 ACN 121987921ACN-121987921-A

Abstract

The invention relates to the technical field of medical instruments and discloses a catheter assembly for coronary intervention treatment, which comprises an outer catheter, wherein a nickel-titanium alloy grid structure is fixedly arranged at the head end of the outer catheter, the caliber of the nickel-titanium alloy grid structure is contracted at a suspension end in a natural state, the nickel-titanium alloy grid structure is in a barrel-shaped structure which is wrapped at the head end of the outer catheter in the natural state, an inner core tube is movably arranged in the outer catheter, the controllable conversion of the nickel-titanium alloy grid structure between an expanded state and a contracted state is realized through the push-pull of the inner core tube, the expanded state provides a stable guide channel for a reverse intervention instrument, the contracted state forms self-adaptive radial clamping, the head end of a microcatheter can be fixed without an additional locking device, the operation steps are simplified, the positioning efficiency is greatly improved, and the problem of butt joint of a forward guide wire and a reverse microcatheter in coronary intervention is solved.

Inventors

ZHU JINZHOU
FENG SHUO

Assignees

上海交通大学医学院附属瑞金医院

Dates

Publication Date: 20260508
Application Date: 20260318

Claims (8)

1. A catheter assembly for coronary intervention, comprising: the head end of the outer catheter is fixedly provided with a nickel-titanium alloy grid structure; The nickel-titanium alloy grid structure comprises a fixed end and a suspension end, wherein the fixed end is fixedly sleeved at the head end of the outer catheter, a first marking point is arranged at the fixed end, a second marking point is arranged at the suspension end, the caliber of the nickel-titanium alloy grid structure is contracted at the suspension end in a natural state, and the nickel-titanium alloy grid structure is in a barrel-shaped structure wrapped at the head end of the outer catheter in a natural state; the inner core tube is movably arranged in the outer guide tube; When the end of the inner core tube moves out of the head end of the outer catheter, the nickel-titanium alloy grid structure is unfolded to enlarge the caliber of the suspended end to form a supporting guide structure, and when the inner core tube is withdrawn, the nickel-titanium alloy grid structure naturally contracts to wrap and fix the end of the instrument extending into the inner core tube.
2. A catheter assembly for coronary intervention as recited in claim 1 wherein said nitinol mesh is in a natural contracted state having a radial dimension at a second marker point that is less than or equal to an outer diameter of said outer catheter.
3. A catheter assembly for coronary intervention as recited in claim 1, wherein the barrel-shaped structure of the nickel-titanium alloy mesh-like structure is formed by mesh enclosure, and the mesh shape is one of diamond, rectangle or hexagon.
4. A catheter assembly for coronary intervention as recited in claim 1, wherein said nickel titanium alloy mesh forms a flared guide passage gradually converging from said first marker point to said second marker point in a natural collapsed state, wherein the caliber at the first marker point is greater than the caliber at the second marker point.
5. A catheter assembly for coronary intervention as recited in claim 4 wherein an edge of said nitinol mesh-like structure that is open at said second marker points is turned outwardly to form a flared guide surface for facilitating introduction of an instrument tip.
6. A catheter assembly for coronary intervention as recited in claim 4 wherein said nickel titanium alloy mesh-like structure forms a minimally radially dimensioned grip in a contracted state at a mesh region between said first marker point and said second marker point for gripping an instrument end extending therein.
7. A method for using a catheter component is applied to a guide wire exchange process in coronary intervention treatment, a catheter assembly according to any one of claims 1-6, comprising the steps of: S1, conveying an outer catheter to a vascular target position; s2, pushing the inner core tube to expand the nickel-titanium alloy grid structure; s3, enabling the head end of the reversely conveyed micro-catheter to extend into the expanded nickel-titanium alloy grid structure; S4, withdrawing the inner core tube to enable the nickel-titanium alloy grid structure to shrink and wrap and fix the head end of the microcatheter; s5, penetrating the guide wire into the fixed microcatheter through the outer catheter and the nickel-titanium alloy grid structure, and completing the establishment of a guide wire path.
8. The method of claim 7, wherein the outer catheter is a 5F elongate catheter adapted to a 6F guide catheter.

Description

Catheter assembly for coronary intervention treatment Technical Field The invention belongs to the technical field of illumination equipment, and particularly relates to a catheter assembly for coronary intervention treatment. Background Chronic total occlusion lesions (Chronic Total Occlusion, CTO) of the coronary arteries, which are the type of severe coronary heart disease with total occlusion of the coronary arteries and a duration of greater than or equal to 3 months, are a difficulty in the field of interventional therapy, and certain CTOs with no occlusion stumps or long occlusion lengths (20 mm) are key technologies for treating such CTOs, especially in case of forward opening failure. The core ‌ of the reverse technique is that a guide wire/instrument is reversely sent to the distal end of the CTO lesion through a side branch circulation channel of a donor vessel, penetrates through a fiber cap and then enters a forward guiding catheter, and finally a track opening vessel is established. To establish the trajectory, the reverse guide wire is required to follow the reverse microcatheter into the guiding catheter after it has passed through the CTO lesion, in which case the forward guide wire is often required to penetrate the reverse microcatheter, a so-called Rendezvous technique. The Rendezvous technique in coronary intervention is a core advanced strategy for treating chronic total occlusion lesions (CTOs), and is mainly used for solving the problem that a guide wire cannot pass through an occlusion segment in the forward direction, and a forward guide wire track is established through a reverse path. The technical key points and clinical application are that 1, a reverse guide wire and a microcatheter are sent to the far end of an occlusion section through a side branch blood vessel (such as a septum and an epicardium side branch), the direction of the guide wire is adjusted to enter a true cavity and pass through the occlusion section, 2), the reverse microcatheter is sent to the near end of a target blood vessel through the occlusion section and is converged with a forward guide catheter to form a physical connection channel, 3) the reverse guide wire is withdrawn, the forward guide wire is penetrated into the reverse microcatheter, and the forward guide wire is pushed to the far-end true cavity to establish a forward track. In the prior art, a certain difficulty exists in penetrating the forward guide wire into the reverse micro-catheter, an operator is required to place the reverse micro-catheter at the turning position of the forward guide wire as much as possible, the success rate of the forward guide wire into the reverse micro-catheter is improved, and the end of the forward guide wire and the reverse micro-catheter are not easy to control the position and the angle of the forward guide wire and the reverse micro-catheter due to the lack of related guiding and fixing technical means in the prior art, so that the success rate of butt joint is not high. In view of the above, research and improvement are made on the existing structure and the existing defects, and a catheter assembly for coronary intervention treatment is provided, so that the purpose of having more practical value is achieved. Disclosure of Invention The present invention provides a catheter assembly for coronary intervention that overcomes the above-identified deficiencies in the prior art. The invention discloses a catheter component for coronary intervention treatment, which is characterized by comprising the following specific technical means: A catheter assembly for coronary intervention treatment comprises an outer catheter, a nickel-titanium alloy grid structure fixedly arranged at the head end of the outer catheter, wherein the nickel-titanium alloy grid structure comprises a fixed end and a suspension end, the fixed end is fixedly sleeved at the head end of the outer catheter, a first marking point is arranged at the fixed end, a second marking point is arranged at the suspension end, the nickel-titanium alloy grid structure is contracted at the suspension end in a natural state, the nickel-titanium alloy grid structure is in a barrel-shaped structure wrapping the head end of the outer catheter in a natural state, an inner core tube is movably arranged inside the outer catheter, the nickel-titanium alloy grid structure is stretched when the end part of the inner core tube moves out of the head end of the outer catheter, the caliber of the suspension end is increased to form a supporting guide structure, and the nickel-titanium alloy grid structure is contracted naturally to wrap the end part of an instrument fixedly stretching into the inner core tube after the inner core tube is withdrawn. In the scheme, controllable conversion of the nickel-titanium alloy grid structure between expansion guiding and contraction clamping is realized through pushing and pulling of the inner core tube, a stable guiding channel is p