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Related Experiment Videos

Intraspinal sacral root stimulation for controlled micturition.

J P Heine, R A Schmidt, E A Tanagho

    Investigative Urology
    |July 1, 1977
    PubMed
    Summary
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    Stimulating sacral nerves, specifically root S2, effectively achieved bladder emptying by maximizing detrusor muscle contraction. This research paves the way for implantable electrodes to treat bladder dysfunction.

    Area of Science:

    • Neuroscience
    • Urology
    • Biomedical Engineering

    Background:

    • Effective bladder emptying requires coordinated detrusor muscle contraction and minimal urethral resistance.
    • Neurological conditions can impair bladder function, leading to urinary retention.
    • Current treatments for denervated bladders are often invasive or insufficient.

    Purpose of the Study:

    • To identify the optimal sacral nerve stimulation parameters for achieving effective bladder emptying.
    • To investigate the feasibility of using intraspinal sacral nerve stimulation for bladder management.
    • To explore the potential for developing chronically implantable electrodes for sacral nerve stimulation.

    Main Methods:

    • Stimulation of intraspinal extradural segments of sacral nerves (S1-S3) in humans.

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  • Unilateral and bilateral stimulation of each root.
  • Separation and individual stimulation of motor and sensory components of sacral roots.
  • Assessment of detrusor contraction and outflow resistance.

    • Main Results:

    • Stimulation of the S2 root yielded the most effective results for bladder emptying.
    • Sacral nerve roots in humans possess a long intraspinal course, suitable for electrode implantation.
    • Both motor and sensory components contributed to the observed effects.

    Conclusions:

    • Sacral nerve root stimulation, particularly S2, is a promising method for inducing bladder emptying.
    • The anatomical accessibility of human sacral roots supports the development of implantable stimulation devices.
    • Further research is needed to develop chronically implantable sacral root electrodes for managing denervated bladders.