Microcalorimeter Inertial Pump Fluid Handling
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Solution Overview
Problem
Chip calorimeters face challenges in handling small sample volumes due to device sensitivity and difficulties in precise sample delivery, particularly with external pumps being too large and lacking precision for closed-chamber systems.
Innovation Solution
Integration of micro-inertial pumps within the chip calorimeter for precise control over fluid flow rates and direction, enabling accurate sample handling and preventing clogging, along with a filtering system for handling contaminants, allowing for parallelized calorimetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external pumps are used for sample delivery in closed-chamber calorimeters, then fluid transport can be achieved, but the pumps are too large and lack precision for microcalorimeter systems
Solution Approach 1:
The patent integrates the pump function directly into the microcalorimeter chip by incorporating a microfluidic channel network that enables fluid transport without external pumps. The chip itself becomes the fluid handling system, eliminating the need for separate pump devices and achieving precise sample delivery at the microscale.
Solution Approach 2:
The patent replaces mechanical pump systems with a microfluidic-based fluid transport mechanism. By using pressure-driven flow through microchannels and gravity-assisted fluid movement, the system achieves precise fluid handling without mechanical moving parts, thereby eliminating size and precision limitations of external pumps.
2Productivity
If small sample volumes are used in chip calorimeters, then faster heating and cooling rates are achieved, but device sensitivity and sample handling precision become challenging
Solution Approach 1:
The patent divides the calorimeter into multiple independent micro-calorimetric chambers on a single chip, each capable of handling small sample volumes independently. This segmentation allows parallel measurements and maintains system reliability by isolating sensitivity requirements to individual chambers while enabling fast thermal response.
Solution Approach 2:
The patent optimizes thermal parameters by using highly conductive materials for heat transfer, minimizing thermal mass of the sample chamber, and controlling fluid flow rates through microchannel design. These parameter changes enable fast heating and cooling rates while maintaining measurement sensitivity through precise thermal coupling and insulation.
3Productivity
If samples are introduced directly without upfront processing, then efficiency is improved, but contaminants may cause clogging in microfluidic channels
Solution Approach 1:
The patent incorporates pre-filtering elements and trap chambers within the microfluidic channel network that capture contaminants before they reach critical components. This preliminary action prevents clogging while allowing direct sample introduction, as the filtering occurs automatically as part of the fluid flow path without requiring separate processing steps.
Solution Approach 2:
The patent introduces intermediary components such as filter membranes and particle traps that act as mediators between the raw sample and the sensitive microcalorimetric measurement zone. These intermediaries remove harmful contaminants while allowing the sample analyte to pass through, enabling direct sample introduction without upfront processing.
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
This solution provides precise control over sample volumes, enhances measurement accuracy, and allows for the direct introduction of samples without upfront processing, improving the efficiency and reliability of chip calorimeter systems.
Implementation Method 1
An inertial pump has a fluid actuator integrated asymmetrically within a microfluidic channel. The fluid actuator can be selectively activated to pump fluid through the microfluidic channel.
Implementation Method 2
A filter couples the first and second microfluidic channels, and a first inertial pump is configured to pump solution from the solution chamber, past the filter, and through the calorimeter to the waste chamber.
Data Source
AI summary
In one embodiment, a microcalorimeter system includes a first microfluidic channel coupling a calorimeter with a sample chamber. A second microfluidic channel couples the calorimeter with a waste chamber. An inertial pump includes a fluid actuator integrated asymmetrically within the first microfluidic channel, and the fluid actuator is capable of selective activation to pump fluid from the sample chamber to the calorimeter and from the calorimeter to the waste chamber through the first and second microfluidic channels, respectively.