An osmotic pump cannula is a thin tube that is attached to an osmotic pump and implanted into an animal's body to deliver a continuous, controlled flow of a drug or other test agent directly into the brain or other tissues.

The osmotic pump is a separate device that is implanted subcutaneously (under the skin) near the cannula. The pump contains a reservoir that holds the drug or test agent, and a semipermeable membrane.

The osmotic pump works by drawing fluid from the animal's body through the semipermeable membrane. This creates a pressure that forces the drug or test agent out of the reservoir and into the cannula, and then into the brain or other tissues. The rate at which the drug is delivered is determined by the properties of the semipermeable membrane and the osmotic pressure of the fluid in the pump's reservoir.

Used with an Osmotic Pump. Has a plastic pedestal molded around a Teflon or fused silica tube that extends below the pedestal. The side tube that connects to the Osmotic Pump is made of Teflon. A break-off segment fits in the mounting holder for placement.

After the Cerebond or dental cement has set, the segment is cut off. The remaining cylindrical pedestal is then covered with skin and sutured for a subcutaneous mounting.