Abstract: An aggregometer has a radiation path along which radiation can pass, a sample receiving area located along the radiation path, a short-wavelength LED that transmits radiation along the radiation path through the sample receiving area, a detector positioned along the radiation path for detecting radiation transmitted from the short-wavelength LED, and a processor that controls intensity of radiation transmitted from the short-wavelength LED.

Abstract: Vertical electromagnetic stirring is used to produce low shear, stress, turbulent and chaotic mixing of a liquid material or suspension in a container regardless of the volume or container geometry. Movement of a magnetic stir bar is controlled by multiple magnetic fields. The magnetic fields are produced by a series of sequentially or non- sequentially activated inductor coils which produce asymmetrical stirring dynamics and random motions of the stir bar, causing the liquid material to be gently and effectively mixed throughout the container. Moving the stir bar in random and irregular patterns during the stirring operation creates turbulent and chaotic mixing dynamics. The stir bars used for supporting vertical magnetic stirring are specifically designed to optimize the effectivity of the mixing process by maximizing the length of the stir bar to quickly and gently mix the materials.

Abstract: A process for filtering a fluid is provided. The process includes providing a filtration cell having a filter membrane, a base configured to receive filtrate passing through the membrane, and a flow channel open to the filter membrane. A flow of the fluid is provided through the flow channel substantially tangent to the filter membrane in a first direction and a second direction substantially opposing the first direction, whereby the fluid reciprocally flows across the filter membrane. Filtrate passing through the membrane is collected. A system for filtering a fluid is also provided.

Abstract: A clot retainer for generally separating liquid from solid components in a specimen enclosed in a container having a closure. The clot retainer includes fingers that are adapted to displace solid components of the specimen. The clot retainer can be inserted through the closure of the container without removing the container. A method of separating liquid from solid components in a specimen is also disclosed.

Abstract: A sample testing device has a volume chamber that separates a known volume of a sample from a remaining sample through the introduction of a fluid between the known volume of the sample and the remaining sample wherein the introduction of the fluid is through a fluid inlet port that has an open and closed state. The device further comprises a passage including a mixing chamber connected to the volume chamber and adapted to mix the sample; a test chamber connected to the mixing chamber and adapted to perform a test on the sample; and a vent port that has an open and a closed state. When the fluid inlet and vent ports are in the open state, the introduction of a pressurized fluid into the fluid inlet port drives the sample from the volume chamber, into one or more mixing chambers, and then into the test chamber.