Interventional drainage shunt catheter with slit valve

WO2026149015A1PCT designated stage Publication Date: 2026-07-16ZHUHAI TON-BRIDGE MEDICAL TECH CO LTD

Patent Information

Authority / Receiving Office: WO · WO
Patent Type: Applications
Current Assignee / Owner: ZHUHAI TON-BRIDGE MEDICAL TECH CO LTD
Filing Date: 2025-11-13
Publication Date: 2026-07-16

AI Technical Summary

Technical Problem

In the process of interventional shunt treatment for hydrocephalus, the existing slit valve of the shunt tube is easily damaged, and residual gas can cause blockage, affecting the shunt effect. In addition, blood clots can easily form emboli, leading to shunt tube failure.

Method used

Design an interventional drainage shunt with a slit valve. The slit valve extends axially and is longer than radially. The distance between the blind end and the slit valve is set to meet specific conditions. Combining metal and silicone materials, stable drainage of cerebrospinal fluid is achieved through pressure difference, avoiding gas residue and thrombus formation.

Benefits of technology

This effectively avoids gas residue between the slit valve and the blind end of the tube, reduces thrombus formation, ensures the stability and safety of the shunt tube, and improves drainage effect.

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Smart Images

Figure CN2025134625_16072026_PF_FP_ABST

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Abstract

An interventional drainage shunt catheter with a slit valve, the interventional drainage shunt catheter comprising a tubular body (1). The body (1) comprises a distal end portion provided with an inlet, a proximal end portion configured as a blind end (9), and an inner cavity communicating the distal end portion with the proximal end portion. A slit valve is provided on a peripheral wall of the proximal end portion near the blind end, and the slit valve is opened by means of a pressure difference between a ventricular system and a venous system to discharge cerebrospinal fluid from the ventricular system to the venous system. The distance between the end of the slit valve close to the blind end (9) and the blind end (9) in an axial direction is defined as l0, l0 satisfying (A), wherein T1 is the temperature of the shunt catheter during hydration and exhaust, P2 is the relative pressure of cerebrospinal fluid in the ventricle, P1 is the air pressure, and T2 is the body temperature, thereby preventing the complete blockage and failure of the drainage shunt catheter due to excessive air remaining therein.

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