Embolization microcatheter for delivery of beads to peripheral vessels

The embolization microcatheter with a coiled distal segment addresses maneuverability issues in delivering beads to peripheral vessels by enhancing flexibility and navigation through complex vascular anatomy, ensuring precise delivery.

HK40134647APending Publication Date: 2026-07-10ACCURATE MEDICAL THERAPEUTICS LTD
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Patent Information

Authority / Receiving Office
HK · HK
Patent Type
Applications
Current Assignee / Owner
ACCURATE MEDICAL THERAPEUTICS LTD
Filing Date
2025-02-28
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing embolization catheters face challenges in effectively delivering beads to peripheral blood vessels due to limitations in maneuverability and flexibility, particularly in tortuous and complex vascular anatomy.

Method used

An embolization microcatheter with an elongated body and a distal segment featuring an offset portion and a coiled portion, where the coiled portion is approximately half a turn of a three-dimensional helix, offset at an angle between 60° and 120° relative to the elongated body, enhancing maneuverability and flexibility for precise bead delivery.

Benefits of technology

The design improves the microcatheter's ability to navigate complex vascular structures, enabling precise and effective delivery of beads to target sites in peripheral vessels.

✦ Generated by Eureka AI based on patent content.

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Abstract

An embolization microcatheter including an elongated main body and a distal section, the distal section comprising an off-setting portion and a winding portion, wherein the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and / or disposed at an acute angle relative to a longitudinal axis of the elongated main body, and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body.
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Description

EMBOLIZATION MICROCATHETER FOR DELIVERY OF BEADS TO PERIPHERAL VESSELS An embolization microcatheter including an elongated main body and a distal section, the distal section an off-setting portion and a winding portion, where the winding portion comprises about half a loop of a three-dimensional constituting spiral, such that a longitudinal axis of the winding portion is offset and / or disposed at an acute angle relative to a longitudinal axis of the elongated main body, and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body. An embolization microcatheter for delivering beads to peripheral blood vessels. An embolization microcatheter includes an elongated body and a distal segment. The distal segment includes an offset portion and a coiled portion, wherein the coiled portion includes approximately half a turn of a three-dimensional helix such that the longitudinal axis of the coiled portion is offset relative to the longitudinal axis of the elongated body and / or set at an acute angle, and wherein the offset portion is set at an angle between approximately 60° and approximately 120° relative to the longitudinal axis of the elongated body. Abstract

Claims

CLAIMSWhat is claimed is:

1. An embolization microcatheter comprising an elongated main body and a distal section, the distal section comprising an off-setting portion and a winding portion; wherein the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and / or disposed at an acute angle relative to a longitudinal axis of the elongated main body; wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body, and wherein the winding portion is configured to maneuver the microcatheter longitudinally in a screw-like motion thereby preventing collapsing and / or vibrating and / or whipping of the distal section of the microcatheter.

2. The embolization microcatheter of claim 1 , wherein the off-setting portion is curved.

3. The embolization microcatheter of any one of claims 1 and 2, wherein the longitudinal axis of the winding portion is offset by between about 0.5 mm and about 5 mm relative to the longitudinal axis of the elongated main body.

4. The embolization microcatheter of any one of claims 1 to 3, wherein the acute angle, at which the longitudinal axis of the winding portion is disposed relative to the longitudinal axis of the elongated main body, is between about 10° and about 60°.

5. The embolization microcatheter of any one of claims 1 to 4, wherein a length of the winding portion measures between about 5 mm and about 20 mm.

6. The embolization microcatheter of any one of claims 1 to 5, wherein a ratio of the length of the winding portion to a radius or mean radius, defined by the half a loop, is between about 2 and about 20.

7. The embolization microcatheter of any one of claims 1 to 6, wherein the three-dimensional spiral is right-handed.The embolization microcatheter of any one of claims 1 to 6, wherein the three-dimensional spiral is left- handed. The embolization microcatheter of any one of claims 1 to 8, wherein the three-dimensional spiral is a helix. The embolization microcatheter of any one of claims 1 to 9, wherein the distal section is pre-shaped. The embolization microcatheter of any one of claims 1 to 10, wherein the main body and the off-setting portion together define a non-planar curve. The embolization microcatheter of any one of claims 1 to 11, wherein the elongated main body further comprises a filter section comprising a plurality of side openings formed in a wall of the elongated main body. The embolization microcatheter of claim 12, wherein the side openings are in the form of slits having a length between about 200 pm and about 800 pm and a width between about 25 pm and about 100 pm. The embolization microcatheter of any one of claims 1 to 13, comprising a wall comprising an inner layer, an outer layer, and a skeleton intercalated between the inner layer and the outer layer. The embolization microcatheter of claim 14, wherein an outer layer section of the outer layer, on the distal section, is more flexible than an outer layer section of the outer layer, on the elongated main body. The embolization microcatheter of any one of claims 1 to 15, wherein the distal section is dimensioned such that, when inserted into a tortuous blood vessel, different portions of the distal section contact opposite sides of the tortuous blood vessel at different longitudinal positions of the tortuous blood vessel. The embolization microcatheter of any one of claims 1 to 16, configured for guide- wire free navigation.15RECTIFIED SHEET (RULE 91 )The embolization microcatheter of any one of claims 1 to 17, wherein the off-set portion is configured to minimize interference of a user’s field of view by the winded portion. A method for producing an embolization microcatheter distal section that defines a non- planar curve, the method comprising: providing a 3 -dimensional mandrel comprising an off-setting portion and a winding portion, wherein the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and / or disposed at an acute angle relative to a longitudinal axis of the elongated main body; and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body; in a heat chamber forming the embolization microcatheter tube on the mandrel, thereby producing the embolization microcatheter having the shape of the mandrel.16RECTIFIED SHEET (RULE 91 )