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Catheter tip pH electrodes for continuous intravascular recording

S M Cobbe, P A Poole-Wilson

    Journal of Medical Engineering & Technology
    |May 1, 1980
    PubMed
    Summary
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    A novel polymer membrane catheter-tip pH electrode enables continuous intravascular pH monitoring in humans and animals. This flexible device offers rapid response and minimal drift for reliable physiological measurements.

    Area of Science:

    • Biomedical Engineering
    • Physiological Measurement
    • Polymer Science

    Background:

    • Continuous intravascular pH monitoring is crucial for managing critically ill patients.
    • Existing pH electrodes often face limitations such as fragility, slow response times, and cross-sensitivity to other physiological parameters.
    • Development of robust and reliable intravascular pH sensors is an ongoing need in clinical practice.

    Purpose of the Study:

    • To develop and characterize a novel, small, flexible catheter-tip pH electrode for continuous intravascular pH measurement.
    • To evaluate the performance of the polymer membrane electrode in vivo, assessing its accuracy, stability, and response time.
    • To demonstrate the feasibility of using the electrode for prolonged monitoring in both animal models and human subjects.

    Main Methods:

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    • A catheter-tip pH electrode utilizing a pH-sensitive polymer membrane was designed.
    • The electrode was integrated into a conventional cardiac catheter for ease of insertion into the vasculature.
    • In vivo performance was assessed through continuous recordings in animals and clinical use in humans, evaluating parameters like response time, drift, and cross-sensitivity.

    Main Results:

    • The developed electrode demonstrated a fast response time of less than 300 ms.
    • Mean in vivo drift was minimal at 0.01 pH units/h, indicating high stability.
    • The electrode exhibited no cross-sensitivity to common ions, osmolality, or oxygen tension, and was insensitive to flow and pressure variations.
    • Continuous recordings of up to 7 hours were successfully obtained in animal studies.
    • The sterilizable electrodes were utilized in human subjects, confirming clinical applicability.

    Conclusions:

    • The novel polymer membrane catheter-tip pH electrode provides a reliable and accurate method for continuous intravascular pH monitoring.
    • Its flexibility, rapid response, stability, and lack of cross-sensitivity make it suitable for diverse clinical and research applications.
    • This technology represents a significant advancement in real-time physiological monitoring, potentially improving patient management and outcomes.