# 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. - **Patent:** US 12733849 - **Original title:** Fluid control devices and methods of using the same - **Granted:** 2026 - **Status:** Active - **Times cited:** 0 - **Field:** medical_devices, biotech, diagnostics, healthcare, mechanical ## What it does 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 does NOT 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. ## 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 ## 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. ## Frequently asked questions ### What does How Suction Controls Fluid Collection for Medical Tests cover? This patent describes a device that uses different levels of suction to precisely control and separate bodily fluids, like blood, for collection and analysis. ### When does this patent expire? This patent is expected to expire on September 15, 2046, when the invention enters the public domain. ### What problem does this patent solve? 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. ### What does this patent NOT cover? Does not cover fluid collection devices that use only a single, fixed pressure differential for all fluid handling. **Full plain-English explainer:** https://patentbrief.org/patent/us/12733849/fluid-control-devices-and-methods-of-using-the-same **Original patent:** https://patents.google.com/patent/US12733849 --- _Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._ ## Related patents Semantically similar inventions in the PatentBrief corpus: - [Device for Collecting and Separating Bodily Fluids Using Pressure](https://patentbrief.org/patent/us/12733848/fluid-control-devices-and-methods-of-using-the-same-12733848) — This patent describes a device that uses different levels of negative pressure to first isolate a portion of bodily fluid and then collect a separate sample from a fluid source. - [Hands-Free Device for Collecting and Moving Urine](https://patentbrief.org/patent/us/12734063/apparatus-and-methods-for-receiving-discharged-urine) — This patent describes a device that collects urine from a person using a receptacle and then uses a vacuum to pull the urine away through a tube, held in place by a curved part between the legs. - [A Special Sticky Layer for Tiny Liquid Channels in Flow Cells](https://patentbrief.org/patent/us/12734520/interposer-with-first-and-second-adhesive-layers) — This patent describes a specific middle layer, called an interposer, for devices that handle tiny amounts of liquid (flow cells), featuring a black plastic base and two methyl acrylic adhesive layers, all pierced by microfluidic channels. - [Precise Medicine Delivery Device with Priming Control](https://patentbrief.org/patent/us/12734300/devices-and-methods-for-precision-dose-delivery) — This patent describes a device for accurately measuring and delivering liquid medicine, using a special mechanism to control how a plunger moves during both initial setup and actual delivery. - [How a Device Delivers Aerosol with Controlled Airflow During Inhalation](https://patentbrief.org/patent/us/12734317/systems-and-methods-of-aerosol-delivery-with-airflow-regulation) — This patent describes an aerosol delivery device that heats a substance from a cartridge to release an aerosol into an airflow passage specifically when a user inhales, and includes a rechargeable internal power source.