How Suction Controls Fluid Collection for Medical Tests

This patent describes a device that uses different levels of suction to precisely control and separate bodily fluids, like blood, for collection and analysis.

What it covers

The fluid control device has an inlet that connects to a bodily fluid source and an outlet that connects to a collection device creating suction. It uses two separate flow controllers to manage the fluid path. First, when a collection device applies a lower level of suction (a 'first magnitude' negative pressure differential), a 'first flow controller' activates. This directs the fluid into a 'sequestration portion' (Abstract). Then, if the collection device applies a stronger suction (a 'second magnitude' negative pressure differential, greater than the first), a 'second flow controller' activates. This directs fluid from the inlet into a 'sampling portion' (Abstract). For example, this could first divert initial blood flow (which might contain contaminants) and then collect a pure sample for testing.

What it doesn't cover

• —Does not cover fluid collection devices that use only a single, fixed pressure differential for all fluid handling.
• —Does not cover devices that rely on gravity or active pumping mechanisms instead of negative pressure differentials to move fluid.
• —Does not cover devices where the sequestration and sampling portions are activated simultaneously by the same pressure.
• —Does not cover fluid control systems that lack distinct, pressure-activated flow controllers for different fluid paths.
• —Does not cover devices where the flow controllers are not triggered by specific magnitudes of negative pressure.

The clever bit

The novelty lies in using different magnitudes of a single negative pressure source to sequentially activate distinct flow paths for separating and collecting fluid. This allows for automated, controlled fractionation of a fluid sample without needing complex external valving or power sources.

Why it matters

Precise and uncontaminated bodily fluid collection is essential for accurate medical diagnostics. This device could improve sample quality by automatically separating initial fluid flows, which may contain skin cells or air, from the main sample needed for analysis. This could lead to more reliable test results and reduce the need for repeat sample collections, which saves time and resources in healthcare settings.

Real-world examples

• 1.Automated blood collection systems
• 2.Point-of-care diagnostic cartridges
• 3.Specialized laboratory sample preparation devices
• 4.Urine analysis systems requiring fractionated collection