Ventriculoamniotic Shunt Anchoring and Valve Design for Fetal Hydrocephalus
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Solution Overview
Problem
Current management options for fetal hydrocephalus, such as preterm delivery or expectant management, pose significant risks to both mother and fetus, and there is a lack of effective antenatal interventions for fetal aqueductal stenosis, leading to irreversible neurologic damage.
Innovation Solution
Development of an in-utero ventriculoamniotic shunting device with a shunt tube, self-expanding anchors, and a one-way passive valve, designed for percutaneous insertion and anchored to prevent migration, to decompress the ventricular system and allow pregnancy to proceed to term.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If preterm delivery is performed to manage fetal hydrocephalus, then intracranial pressure can be relieved, but prematurity complications and poor neurologic outcomes occur
Solution Approach 1:
The shunt device is implanted in utero before term delivery, performing the pressure relief action preliminarily while the fetus is still in the womb. This allows the pregnancy to continue to term while maintaining intracranial pressure control, avoiding the need for preterm delivery and its associated complications.
2Reliability
If expectant management is used for fetal hydrocephalus, then pregnancy can proceed to term, but irreversible neurologic damage occurs due to unrelieved intracranial pressure
Solution Approach 1:
The shunt is implanted preliminarily during the fetal period to establish pressure relief before term delivery, enabling both term pregnancy completion and neurologic protection.
Solution Approach 2:
The shunt device acts as an intermediary mechanism between the ventricular system and amniotic cavity, providing a controlled pathway for CSF drainage that mediates intracranial pressure reduction while allowing normal fetal development to proceed.
3Stress or pressure
If traditional ventriculoperitoneal shunting is performed postnatally, then hydrocephalus can be treated, but the fetus has already suffered irreversible brain damage
Solution Approach 1:
The shunt is implanted preliminarily in utero rather than waiting for postnatal intervention, establishing pressure relief during the critical period of brain development when the fetus is still in the womb, thereby preventing irreversible damage before treatment begins.
4Ease of operation
If a simple shunt tube is used, then the device is easy to implant, but the shunt migrates or dislodges from position
Solution Approach 1:
Self-expanding anchors are pre-formed in a compressed state for easy catheter-based delivery, then automatically expand at the target site to secure the shunt in position, combining ease of implantation with reliable positioning.
Solution Approach 2:
The self-expanding anchors automatically expand upon deployment to engage with surrounding tissue, securing the shunt in position without requiring additional surgical steps for anchoring, thus maintaining ease of operation while ensuring reliable positioning.
5Reliability
If a one-way valve is added to prevent amniotic fluid reflux, then CSF flow direction is controlled, but device complexity increases
Solution Approach 1:
A one-way valve is incorporated as an intermediary component within the shunt system to control CSF flow direction and prevent amniotic fluid reflux, accepting the necessary increase in device complexity to achieve reliable flow control and protect against infection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively relieves intracranial pressure, prevents further brain damage, and allows for normal fetal development, reducing the risk of lifelong neurological impairments and complications.
Implementation Method 1
The shunt tube includes a composite that forms the inner diameter and the outer diameter including metallic wire and one or more silicone-based layers applied to the metallic wire; and one or more self-expanding anchors formed on the exterior surface along the length of the shunt tube, including a shape memory alloy wire or mesh structure
Implementation Method 2
a one-way passive valve positioned in the cavity of the shunt tube
Data Source
AI summary
The invention relates to an in-utero ventriculoamniotic shunting device that includes a composite shunt tube composed of polymer material, e.g., silicone-based material, and metallic wire, having a bend or curve formed in the length of the shunt tube, with one or more anchors composed of super-elastic wire or mesh, e.g., shape memory alloy wire or mesh structures, attached to the shunt tube, and a one-way passive valve composed of a thin polymer membrane. The anchors are effective to prevent migration and dislodgement of the shunting device following its deployment, and the valve is effective to prevent the backflow of amniotic fluid.