Flexible Tip Assembly for Two-Component Hydrogel Sealant Delivery
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Solution Overview
Problem
Current methods for achieving watertight closure of the dura mater during neurosurgical procedures, such as craniotomy and spinal surgery, often fail to consistently prevent cerebrospinal fluid (CSF) leakage from confined and hard-to-reach areas, leading to complications like pseudomeningoceles, wound healing issues, and increased surgical interventions.
Innovation Solution
A flexible, extended tip assembly for a multi-component delivery system that combines a polyalkyleneimine and a crosslinking reagent, such as polyethylene glycol, to form a hydrogel sealant, allowing for improved access and visualization in difficult surgical sites by creating a locally directed spray through a mixing nozzle and cannulae system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dural closure techniques are used, then surgical simplicity is maintained, but CSF leakage prevention reliability is insufficient
Solution Approach 1:
The patent employs a two-component hydrogel system combining polyalkyleneimine and crosslinking reagent that forms a composite sealant material. This composite approach creates a more reliable seal than conventional single-material techniques, directly addressing the CSF leakage prevention reliability issue while maintaining reasonable procedural complexity
Solution Approach 2:
The patent utilizes a spray delivery system that employs pneumatic principles to deliver the hydrogel components as a mist or spray. This hydraulic/pneumatic approach allows the sealant to reach confined areas effectively, improving CSF leakage prevention in hard-to-reach locations without significantly increasing overall device complexity
2Ease of operation
If extended flexible tip assembly is used, then access to confined areas is improved, but device complexity increases
Solution Approach 1:
The patent employs a flexible tip assembly that can be bent and extended to reach confined surgical areas. The flexible construction allows the tip to navigate complex anatomical pathways while maintaining a relatively simple overall device structure, directly improving access to hard-to-reach dural locations
Solution Approach 2:
The tip assembly is divided into segmented components including the flexible tip portion and the cannulae system. This segmentation allows each component to be optimized for its specific function while keeping the overall device complexity manageable through modular design
3Reliability
If two-component hydrogel system is used, then sealant effectiveness is improved, but risk of clogging increases
Solution Approach 1:
The spray delivery system uses pneumatic pressure to atomize and deliver the two-component hydrogel mixture. This pneumatic approach prevents clogging by maintaining continuous fluid flow and preventing the components from settling or congealing in the delivery cannulae, while still achieving effective sealing at the application site
Solution Approach 2:
The system employs periodic or intermittent spraying rather than continuous delivery. This periodic action allows brief intervals for pressure equalization and prevents over-pressurization that could cause clogging, while maintaining effective sealant delivery through repeated short bursts of material application
4Manufacturing precision
If spray delivery method is used, then application precision is improved, but device complexity increases
Solution Approach 1:
The spray delivery mechanism uses pneumatic principles to achieve precise control over sealant application. By regulating air pressure and flow, the system can deliver the hydrogel components as a controlled mist or spray, allowing precise application to specific dural defects while keeping the overall device design relatively simple
Solution Approach 2:
The spray delivery system applies the sealant with local precision, targeting specific areas of dural leakage rather than requiring uniform application across the entire dural surface. This localized precision approach improves sealing effectiveness at defect sites while minimizing overall material usage and simplifying the application process
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 flexible tip assembly effectively delivers a two-component hydrogel sealant to confined areas, reducing CSF leakage and enhancing surgical accessibility, with improved preparation efficiency and reduced clogging, thereby minimizing post-surgical complications and hospitalization costs.
Implementation Method 1
a mixing chamber (10) disposed between and in fluid communication with the fluid inlet and the fluid outlet
Implementation Method 2
the crosslinking reagent causes the polyalkyleneimine polymers to polymerize, thereby forming a seal
Implementation Method 3
a two-component hydrogel dural sealant suitable for use as an adjunct to standard methods of dural repair
Data Source
AI summary
Provided is an extended length, flexible or bendable spray tip assembly for use with a multi-component surgical sealant. The tip assembly is particularly suited for use in surgical procedures having limited access to a surgical field, for example, neurosurgical procedures involving infratentorial, skull base, or transsphenoidal craniotomy, as well as the spine. The tip assembly can be used in combination with a multi-component delivery system or applicator.