- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02321995
A Quantitative Optical Sensor to Monitor Vascular Physiology; A Healthy Volunteer Study
Study Overview
Status
Conditions
Detailed Description
PURPOSE OF THE STUDY:
- There exist significant systematic and random errors in the in vivo spectroscopic measurement of tissue hemoglobin concentrations, blood oxygenation, and scattering coefficient due to uncontrolled probe-to-tissue interface and the lack of a real-time calibration.
- It is possible to design and engineer a fiber optic sensor to perform accurate and reproducible diffuse reflectance spectroscopy (DRS) for noninvasive quantification of tissue physiology and morphology in vivo. Features such as probe pressure control and instrument self-calibration will improve signal-to-noise ratios by removing user bias from optical measurements.
STUDY OBJECTIVES
1) Evaluation of the pressure sensor in healthy volunteers to determine the minimum contact pressure required for spectroscopic measurements
DESIGN AND PROCEDURES:
Evaluation of the pressure sensor in a volunteer study (n=10)
Informed consent will be obtained from all volunteers. In order to assess the pressure sensor, all research procedures will be repeated twice (once with the aid of the stepper motor and once without the aid of the stepper motor.) For the first five subjects, measurements will be made with the stepper motor first followed by measurements without the stepper motor. The remaining five-subjects will receive the measurements in the reverse order (no stepper motor following by stepper motor). Before the optical measurements, all subjects will be asked to rinse their mouth with a 0.9% saline solution in order to minimize the influence of consumed food. The instrument is high-level disinfected prior to each use in cidex or sterilized by ethylene oxide per standard clinical procedure. Furthermore, it is not anticipated that this device will pose a significant risk to vulnerable populations. The probe will be covered with an optically clear protective sterile sheath and placed in contact with the soft tissue. Reflectance measurements will be taken from each volunteer at up to 5 pressure levels (25, 50, 75, 100, 150 mmHg). At each pressure level 10 spectra will be acquired sequentially. The first measurement will start immediately after the desired probe pressure is reached. This will generate a total of 100 sample and calibration spectra pairs from each subject. This will be repeated on other sites including the tongue, cheek and gums. The sample spectrum will be calibrated using the calibration spectrum collected concurrently. Three tissue parameters will be used to analyze the pressure effects which is described here with [THb] as an example: First, the mean [THb] and its standard deviation will be calculated from the 10 repeat measurements at each pressure for each subject for measurements with and without the stepper motor and plotted against the probe pressure (refer to as THb-P curve). Second, at each pressure level, the [THb] will be plotted against time for each subject and the curve will indicate the temporal response of the tissue under that probe pressure. A series of paired t-tests will be used to identify the contact pressure at which minimal [THb] variance occurs over time (when stepper motor is used). Next, the variance at that contact pressure will be compared to the case without the stepper motor to demonstrate a significant reduction in pressure variance.
The investigators do not anticipate any risks to participants, however, there are a few potential minimal risks such as loss of confidentiality; slight risk of infection; discomfort at the pressure sites; and jaw discomfort as a result of the mouth being opened for several minutes.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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North Carolina
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Durham, North Carolina, United States, 27705
- Duke University Medical Center
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria:
- Healthy volunteer with no presentation of disease (such as no complaints or self-reported oral symptoms or lesions; no cold or flu like symptoms) that would affect the reflective measurements in the oral cavity
- Age 18 or older
- Subjects of all ethnic and gender groups will be included
- Ability to understand and the willingness to sign a written informed consent document
Exclusion Criteria:
- Subjects considered in "vulnerable" populations such as children under the age of 18
- Complaint of oral symptoms or lesions
- Current cold or flu like symptoms (self-reported)
- Pregnancy (self-reported by menstrual history)
Study Plan
How is the study designed?
Design Details
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
minimum contact pressure required for spectroscopic measurements
Time Frame: at the time the optical measurements are collected
|
at the time the optical measurements are collected
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Mark Dewhirst, DVM, PhD, Duke University
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- Pro00057177
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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