Which device is used for long-term, continuous infusion in unrestrained animals?

Which device is used for long-term, continuous infusion in unrestrained animals?

• A. Diffusion port
• B. Osmotic pump
• C. Vascular port
• D. Luer lock

Answer: (B)

Long-term, continuous infusion in an unrestrained animal is best achieved with an osmotic pump. These implantable devices hold a drug reservoir and release drug at a constant rate driven by osmotic pressure, so once implanted subcutaneously (or in another site) they deliver steadily over days to weeks without any external tubing or tethering. This means the animal can move freely while the infusion continues, which reduces stress and keeps study conditions consistent. Other options either require external connections or aren’t designed for autonomous, sustained delivery—diffusion ports rely on diffusion through a membrane or external access, vascular ports need an implanted catheter plus an external pump, and a Luer lock is simply a connection type for syringes.

Long-term, continuous infusion in an unrestrained animal is best achieved with an osmotic pump. These implantable devices hold a drug reservoir and release drug at a constant rate driven by osmotic pressure, so once implanted subcutaneously (or in another site) they deliver steadily over days to weeks without any external tubing or tethering. This means the animal can move freely while the infusion continues, which reduces stress and keeps study conditions consistent. Other options either require external connections or aren’t designed for autonomous, sustained delivery—diffusion ports rely on diffusion through a membrane or external access, vascular ports need an implanted catheter plus an external pump, and a Luer lock is simply a connection type for syringes.