Vibration-Rod Lysis Wells for Magnetic Bead Nucleic Acid Extraction
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Solution Overview
Problem
Existing methods for nucleic acid extraction face challenges in efficient mixing and minimization of liquid handling, contamination, and reagent carryover, particularly in small volumes, which are critical for molecular diagnostics.
Innovation Solution
A system utilizing magnetic and mechanical oscillation through vibration rods to generate high-speed vortices in a multi-well sample holder, combined with magnetic bead agitation, minimizes liquid handling and reduces cross-contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vortex mixing is used to achieve effective mixing in small volumes, then mixing efficiency is improved, but the setup becomes bulky and complex
Solution Approach 1:
The patent employs mechanical vibration through vibration rods that directly contact the fluid in small wells to generate mixing effects. The vibration rods are driven by a piezoelectric element or electromagnetic actuator that generates high-frequency vibrations, creating effective mixing in confined spaces without requiring bulky vortex mixing equipment. This resolves the contradiction by achieving high mixing efficiency through vibration-based mechanisms that fit within compact well structures.
Solution Approach 2:
The patent replaces traditional mechanical vortex mixing systems with a vibration-based mechanism. Instead of using external vortex generators that require large setup space, the system uses vibration rods that transmit mechanical vibrations directly to the fluid through contact. This substitution enables effective mixing in small volumes while maintaining a compact device structure, thus resolving the contradiction between mixing efficiency and device complexity.
2Manufacturing precision
If magnetic beads are used for nucleic acid extraction, then extraction quality is improved, but liquid handling and contamination risks increase
Solution Approach 1:
The patent combines magnetic bead manipulation with vibration-based mixing in a single integrated system. The vibration rods simultaneously mix the fluid and agitate the magnetic beads, eliminating the need for separate liquid handling steps for bead resuspension. This integration reduces the number of aspiration and dispensing operations, thereby minimizing contamination risks while maintaining extraction quality through effective magnetic bead utilization.
Solution Approach 2:
The vibration rods enable the magnetic beads to self-mix and self-suspend through direct vibration contact. The mechanical vibrations cause the magnetic beads to agitate and distribute uniformly throughout the fluid without requiring external pipetting or liquid handling interventions. This self-service mechanism reduces operator contact and liquid transfer steps, thereby minimizing contamination risks while maintaining effective bead utilization for high-quality extraction.
3Object-affected harmful factors
If multiple aspiration and dispensing tips are used for sample processing, then cross-contamination is reduced, but the number of components and complexity increase
Solution Approach 1:
The vibration rods serve multiple functions simultaneously: they mix the fluid, agitate magnetic beads, and facilitate nucleic acid extraction. This multi-functionality eliminates the need for multiple specialized tips and components that would otherwise be required for separate mixing, bead manipulation, and extraction steps. By consolidating these functions into a single vibration rod system, the patent reduces component complexity while maintaining contamination control through minimized liquid handling.
4Speed
If vibration rods are used to generate high-speed vortices in confined spaces, then mixing speed is improved, but the space requirements and device design become more challenging
Solution Approach 1:
The patent transitions from external vortex generation (requiring space above or beside the well) to internal vibration-based mixing (within the well itself). The vibration rods are inserted directly into the wells and generate mixing effects in three dimensions within the confined well space. This dimensional transition enables high-speed mixing in confined spaces by utilizing the vertical dimension for rod insertion and three-dimensional vibration patterns, thereby achieving fast mixing without increasing horizontal space requirements or external device complexity.
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
Enhances mixing efficiency, reduces aggregation, and improves the quality and speed of nucleic acid extraction, facilitating high-throughput processing with customizable mixing parameters.
Implementation Method 1
A system utilizing magnetic and mechanical oscillation through vibration rods to generate high-speed vortices in a multi-well sample holder
Implementation Method 2
Magnetic beads and associated nucleic acid molecules may be moved between wells using a magnetic that is external to the sample holder
Implementation Method 3
The beads are functionalized, for example with silica surfaces, to allow selective binding of nucleic acid molecules such as DNA
Data Source
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Figure 3A
AI summary
An apparatus, vortex generator assembly and method for automated cell lysis and nucleic acid purification and processing. The vortex generator assembly includes sample holder having a lysis well, at least one wash well, and an elution well. The vortex generator assembly also includes a sample holder cover having a plurality of vibration rods for creating a vortex in the wells of the sample holder. The apparatus includes motor operating a rotating cam to cause the vibration rods to vibrate and create the vortex in a well holding fluid and magnetic beads, wherein the vortexing speed is sufficient to overcome the magnetic attraction between the beads and disperse the beads in solution, to collect nucleic acids such as DNA.