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Method for automatic, continuous blood sampling with remote alarm for clogged catheters.

A M Lefcourt, J Bitman

    Journal of Dairy Science
    |August 1, 1985
    PubMed
    Summary
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    A new, inexpensive blood sampling system features a remote alarm to alert users if blood withdrawal slows. This system reliably collects continuous blood samples from cows for extended periods and can be adapted for other critical flow monitoring applications.

    Area of Science:

    • Veterinary Medicine
    • Biomedical Engineering
    • Analytical Chemistry

    Background:

    • Continuous blood sampling is crucial for pharmacokinetic and physiological studies.
    • Existing methods can be expensive, unreliable, or require frequent manual intervention.
    • Catheter clogging is a common challenge in long-term indwelling catheter systems.

    Purpose of the Study:

    • To develop an affordable and reliable system for continuous blood sampling.
    • To incorporate an automated alarm for monitoring blood withdrawal rates.
    • To design a robust catheter and a method for efficient replacement.

    Main Methods:

    • Development of an inexpensive blood sampling apparatus with a remote alarm system.
    • Design and implementation of a reliable sampling catheter.

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  • Establishment of a procedure for rapid, atraumatic catheter replacement.
  • In vivo testing of the system for continuous blood collection in cows.

    • Main Results:

    • The system successfully collected continuous, integrated blood samples every 15 minutes for up to 72 hours from cows.
    • The remote alarm effectively triggered upon a decrease in the rate of blood withdrawal.
    • The catheter replacement method proved quick and atraumatic.
    • The system demonstrated utility beyond animal studies, applicable to critical flow monitoring like column chromatography.

    Conclusions:

    • The developed blood sampling system is cost-effective, reliable, and suitable for long-term continuous monitoring.
    • The integrated alarm system enhances safety and efficiency by detecting critical flow rate changes.
    • The system's design, including catheter management, addresses key challenges in prolonged blood sampling.
    • This technology has broad applicability in research and analytical processes requiring precise flow control.