CN-121987933-A - Conical dilating catheter for artificial arteriovenous fistula stenosis

CN121987933ACN 121987933 ACN121987933 ACN 121987933ACN-121987933-A

Abstract

The application relates to a conical dilating catheter for artificial arteriovenous fistula stenosis, and relates to the technical field of medical appliances. The pressure control device comprises a catheter body, an expansion piece, a pressure control component and a filling component, wherein the expansion piece is arranged on the periphery of the catheter body, the expansion piece is conical in shape, the pressure control component is arranged on the expansion piece at intervals, the pressure control component divides the inside of the expansion piece into a plurality of accommodating spaces, the filling component is communicated with the expansion piece, and the filling component is used for filling filler into the expansion piece. The tapered design of the stent is easier to pass through the stricture site. The segmented separation and step-by-step expansion structure of the pressure control assembly enables a single catheter body to integrate the expansion functions of 'small, medium and large', does not need to replace an expansion piece for multiple times, reduces consumable use, reduces medical cost, simultaneously avoids repeated withdrawal and feeding of the catheter body, shortens operation time, and reduces related risks of operation such as guide wire displacement, thrombus shedding and the like.

Inventors

ZHOU AIQIANG
LIU YANGDONG
WANG CHAO

Assignees

深圳大学附属华南医院

Dates

Publication Date: 20260508
Application Date: 20260309

Claims (10)

1. A tapered dilation catheter for use in the narrowing of an artificial arteriovenous fistula, comprising: A catheter body; an expansion piece arranged on the periphery of the catheter body, wherein the expansion piece is conical in shape; The pressure control assemblies are arranged on the expansion piece at intervals, divide the inside of the expansion piece into a plurality of accommodating spaces, and are used for controlling the conduction of two adjacent accommodating spaces; and the filling assembly is communicated with the expansion piece and is used for filling filler into the expansion piece.
2. The tapered dilation catheter for stenosis of an artificial arteriovenous fistula of claim 1, wherein the dilation member comprises a front end section, a middle section and a rear end section, the diameters of the front end section, the middle section and the rear end section increasing in sequence, a front end space being formed in the front end section, a middle section space being formed in the middle section, a rear end space being formed in the rear end section; the pressure control components are arranged in two, and the two pressure control components are respectively arranged between the front end section and the middle section and between the middle section and the rear end section.
3. The tapered dilation catheter for stenosis of an artificial arteriovenous fistula of claim 2, wherein a first transition arc is disposed between the anterior end segment and the medial segment, and a second transition arc is disposed between the medial segment and the posterior end segment.
4. The tapered dilation catheter for stenosis of an artificial arteriovenous fistula of claim 2, wherein the pressure control assembly comprises a pressure membrane disposed between the anterior end section and the middle section or between the middle section and the posterior end section, the pressure membrane being configured to isolate the anterior end space from the middle section space or isolate the middle section space from the posterior end space.
5. The tapered dilation catheter for artificial arteriovenous fistula in claim 4 wherein the pressure control assembly comprises a tie ring disposed outside of the pressure membrane.
6. The tapered dilation catheter for stenosis of an artificial arteriovenous fistula of claim 5, wherein the cinch ring is coaxially disposed with the pressure membrane, an outer diameter of the cinch ring being coincident with an outer diameter of the dilator in a corresponding position after dilation.
7. A tapered dilation catheter for artificial arteriovenous fistula in accordance with claim 1 wherein the outer circumference of the dilator is provided with a score wire.
8. The tapered dilation catheter for artificial arteriovenous fistula in claim 7 wherein the score wire is helically distributed around the circumference of the dilator.
9. The tapered dilation catheter for artificial arteriovenous fistula in claim 2 wherein the filling assembly comprises a filling member and a filling tube, the filling tube communicating the filling member and the dilation member.
10. The tapered dilation catheter for artificial arteriovenous fistula stenosis of claim 9, wherein the filling tube is in communication with the front-end space.

Description

Conical dilating catheter for artificial arteriovenous fistula stenosis Technical Field The invention relates to the technical field of medical appliances, in particular to a conical dilating catheter for artificial arteriovenous fistula stenosis. Background The chronic renal failure patient needs to rely on hemodialysis to support life, and an artificial arteriovenous fistula is the first dialysis access, which is matched with a superficial vein through an artery, so that the vein expands and thickens under the impact of arterial blood to adapt to dialysis puncture. However, the sudden pressure drop, high blood flow impact and repeated puncture injury in the anastomotic stoma area easily cause hyperplasia of the blood vessel intima, and cause stenosis of the anastomotic stoma and vein segment, which are main causes of internal fistula loss of work. At present, percutaneous transluminal angioplasty is used for treating stenosis, and an inner membrane is torn and proliferated through expansion of an expansion piece, but the existing expansion piece has obvious defects that firstly, an equal-diameter design cannot be adapted to a blood vessel structure with thin front and thick rear, a small expansion piece is insufficient in expansion, a large expansion piece is easy to cause vascular rupture, secondly, the expansion piece needs to be replaced for many times for the stenosis with a long section or a large diameter difference, and medical cost and operation risks are increased. Therefore, there is a need for a new dilating catheter based on structural optimization that addresses the above-described technical pain points. In view of the above-mentioned related art, there is a problem in that the existing tapered dilation catheter for artificial arteriovenous fistula is poor in suitability. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a tapered dilation catheter for an artificial arteriovenous fistula, which aims to solve the problem of poor suitability of the existing tapered dilation catheter for an artificial arteriovenous fistula. The application provides a conical expansion catheter for artificial arteriovenous fistula stenosis, which adopts the following technical scheme that the conical expansion catheter for artificial arteriovenous fistula stenosis comprises: A catheter body; an expansion piece arranged on the periphery of the catheter body, wherein the expansion piece is conical in shape; The pressure control assemblies are arranged on the expansion piece at intervals, divide the inside of the expansion piece into a plurality of accommodating spaces, and are used for controlling the conduction of two adjacent accommodating spaces; and the filling assembly is communicated with the expansion piece and is used for filling filler into the expansion piece. Optionally, the expansion piece includes a front end section, a middle section and a rear end section, diameters of the front end section, the middle section and the rear end section are sequentially increased, a front end space is formed in the front end section, a middle section space is formed in the middle section, and a rear end space is formed in the rear end section; the pressure control components are arranged in two, and the two pressure control components are respectively arranged between the front end section and the middle section and between the middle section and the rear end section. Optionally, a first transition arc is arranged between the front end section and the middle section, and a second transition arc is arranged between the middle section and the rear end section. Optionally, the pressure control assembly includes a pressure membrane, the pressure membrane is disposed between the front end section and the middle section or between the middle section and the rear end section, and the pressure membrane is used for isolating the front end space and the middle section space or isolating the middle section space and the rear end space. Optionally, the pressure control assembly includes a tie ring disposed outside of the pressure membrane. Optionally, the binding ring and the pressure membrane are coaxially arranged, and the outer diameter of the binding ring is consistent with the outer diameter of the corresponding position after the expansion piece is expanded. Optionally, the periphery of the expansion member is provided with a score wire. Optionally, the score wire is helically distributed around the circumference of the expansion member. Optionally, the filling assembly includes a filler and a filler tube, the filler tube communicating the filler and the expansion member. Optionally, the filling tube communicates with the front end space. Compared with the prior art, the embodiment of the invention has the following advantages: the tapered design of the stent is easier to pass through the stricture site. The segmented separation and step-by-step expans