Related Experiment Videos
A self-powered constant infusion device for use in unrestrained rats
1Department of Physiology and Molecular Medicine, Medical College of Ohio, Toledo 43614-5804, USA. pbrand@mco.edu
Summary
A novel device enables constant fluid delivery in conscious animals, maintaining catheter patency and facilitating drug administration with minimal volume. This technology minimizes animal stress during experiments.
Area of Science:
- Physiology
- Biomedical Engineering
- Animal Models
Background:
- Maintaining catheter patency is crucial for long-term physiological studies in conscious animals.
- Drug delivery and physiological monitoring require precise fluid administration with minimal disturbance.
- Existing methods often involve significant restraint or volume loading, impacting experimental validity.
Purpose of the Study:
- To develop and validate a novel device for constant rate fluid delivery in conscious animals.
- To enable drug administration and maintain intravascular catheter patency with minimal animal restraint.
- To facilitate physiological measurements, such as blood pressure, without disturbing the subject.
Main Methods:
- A self-contained device delivers fluids at low, constant rates (1.0-1.5 ml/day) via indwelling catheters.
- Heparinized saline infusions maintain arterial and venous catheter patency.
- Catheters are routed through a protective spring to a suspended, fluid-free swivel system for 360-degree rotation.
- The system allows for blood sampling, injections, infusions, and connection to pressure transducers with minimal disturbance.
Main Results:
- The device successfully delivered fluids at a constant, low rate suitable for minimal volume loading in rats.
- Intravascular catheter patency was effectively maintained using heparinized saline infusions.
- The setup allowed for measurements of arterial and central venous blood pressures in conscious rats without apparent distress.
- Minimal restraint was achieved due to the suspended, freely rotating device.
Conclusions:
- This device offers a significant advancement for long-term studies in conscious animals requiring precise fluid delivery and monitoring.
- It enhances experimental reliability by minimizing animal stress and physiological disruption.
- The technology is versatile for applications including drug delivery, catheter patency maintenance, and physiological data acquisition.