Minimally invasive intracranial pressure monitoring: An epidural approach with a piezoresistive probe

Garich, Jonathan; Fritz, Nicholas; Kullman, Dixie E.; Munoz, Jesse; Christen, Jennifer Blain

doi:10.1109/biocas.2017.8325199

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…In these studies, the pressure measured from the epidural space has been accepted to reflect the changes in ICP [6,13]. Intracranial and epidural pressures have been shown to peak immediately after epidural injection and subsequently decrease [4,14]. In our study, patients treated with epidural injectate volumes greater than 60 ml had significant increases in ONSD values immediately after the procedure compared to baseline values.…”

Section: Dıscussıonmentioning

confidence: 53%

Assessment of Optic Nerve Sheath Diameter in Patients Undergoing Epiduroscopy

Tire

Çöven²,

Cebeci

et al. 2019

Med Sci Monit

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Departmental sources Background: Epiduroscopy is commonly used for the evaluation and treatment of low back pain. Saline with or without local anesthetic addition was used to visualize epidural space structure during this procedure. A rapid increase in epidural space pressure is transmitted into the spinal space to the optic nerve sheath. This study aimed to estimate the effects of epiduroscopy on optic nerve sheath diameter (ONSD) according to the volume of fluid using the ultrasonographic measurement of optic nerve diameter in adult patients. Material/Methods: Sixty patients who had been treated for low back pain with epiduroscopy using low-volume (LV) or high-volume (HV) fluid application were enrolled into the study. Measurement of ONSD was performed before (T0) and immediately after epiduroscopy (T1), at 10 min (T2), and 20 min (T3) after the epiduroscopy. Results: Both groups showed significant differences over time in ONSD (PGroup×Time=0.001). The HV group showed greater changes from T0 to T2 and T3 than the LV group in ONSD. However, in both groups, ONSDs at T2 and T3 were significantly larger than those with the highest values at T2 compared to T0. Conclusions: Ultrasonography of ONSD presents a good level of diagnostic accuracy for identifying epidural hypertension. In the clinical decision-making phase, this may help physicians to be more cautious about volume when performing epidural injections to treat this disease.

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Section: Dıscussıonmentioning

confidence: 53%

Assessment of Optic Nerve Sheath Diameter in Patients Undergoing Epiduroscopy

Tire

Çöven²,

Cebeci

et al. 2019

Med Sci Monit

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Precision-Microfabricated Fiber-Optic Probe for Intravascular Pressure and Temperature Sensing

Poduval

Coote

Mosse

et al. 2021

IEEE J. Select. Topics Quantum Electron.

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Small form-factor sensors are widely used in minimally invasive intravascular diagnostic procedures. Manufacturing complexities associated with miniaturizing current fiber-optic probes, particularly for multiparameter sensing, severely constrain their adoption outside of niche fields. It is especially challenging to rapidly prototype and iterate upon sensor designs to optimize performance for medical devices. In this work, a novel technique to construct a microscale extrinsic fiber-optic sensor with a confined air cavity and sub-micron geometric resolution is presented. The confined air cavity is enclosed between a 3 µm thick pressure-sensitive distal diaphragm and a proximal temperature-sensitive plano-convex microlens segment unresponsive to changes in external pressure. Simultaneous pressure and temperature measurements are possible through optical interrogation via phase-resolved low-coherence interferometry (LCI). Upon characterization in a simulated intravascular environment, we find these sensors capable of detecting pressure changes down to 0.11 mmHg (in the range of 760 to 1060 mmHg) and temperature changes of 0.036˚C (in the range 34 to 50˚C). By virtue of these sensitivity values suited to intravascular physiological monitoring, and the scope of design flexibility enabled by the precision-fabricated photoresist microstructure, it is envisaged that this technique will enable construction of a wide range of fiberoptic sensors for guiding minimally invasive medical procedures.

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Minimally invasive intracranial pressure monitoring: An epidural approach with a piezoresistive probe

Cited by 2 publications

References 13 publications

Assessment of Optic Nerve Sheath Diameter in Patients Undergoing Epiduroscopy

Assessment of Optic Nerve Sheath Diameter in Patients Undergoing Epiduroscopy

Precision-Microfabricated Fiber-Optic Probe for Intravascular Pressure and Temperature Sensing

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