An Optical System for Measuring Blood Pressure


An assesment of an optical system that measures blood pressure on the finger -Elfor 1 device. The system is based on a small optical sensor that emits coherent light into the skin and collects the reflected light from the red blood cells in the blood vessels in the skin under the sensor. The sensor is able to detect the pulse wave and blood pressure can be measured.

The investigators plan to measure blood pressure with the new sensor in patients who are attending the Hypertension Clinic at Meir Hospital or are undergoing hemodialysis to validate the sensor.

Full Title of Study: “Correlation of Blood Pressure Measurements Using an Optical System for Measuring Blood Pressure”

Study Type

  • Study Type: Interventional
  • Study Design
    • Intervention Model: Single Group Assignment
    • Primary Purpose: Device Feasibility
    • Masking: None (Open Label)
  • Study Primary Completion Date: February 15, 2018

Detailed Description

If the blood flow is temporarily interrupted by inflating a small pneumatic cuff at the root of the finger, blood flow is occluded and the pulse wave disappears. As the pressure in the cuff is released, blood flow returns, the pulse wave is again detected and blood pressure can be measured. This apparatus is easy to use and will allow simplified monitoring of blood pressure contains the laser source and optical sensors that measure the reflected light.

The investigators proposed to validate the sensor by measuring the blood pressure in patients with this optical sensor and also by standard plethysmography. The investigators plan to measure participants with low, normal and high blood pressure in order to assess the accuracy and reliability of the new device.


  • Device: Blood pressure measurement
    • Blood pressure measurement with a standard plethysmograph
  • Device: Blood pressure measurement with the new device
    • Blood pressure measurement with the optical sensor, Elfor -1 device.

Arms, Groups and Cohorts

  • Experimental: Blood pressure measurement
    • Patients requiring blood pressure measurement will have their blood pressure measured in the standard manner by plethysmography, and then with the Elfor -1 device , the new optical sensor, in order to determine the performance of the new sensor.

Clinical Trial Outcome Measures

Primary Measures

  • Blood pressure reading
    • Time Frame: three hours
    • Measurements will be performed with a standard plethysmograph and with a new sensor

Participating in This Clinical Trial

Inclusion Criteria

  • patients on hemodialysis or visiting the hypertension outpatient clinic at Meir Medical Hospital.

Exclusion Criteria

Gender Eligibility: All

Minimum Age: 18 Years

Maximum Age: N/A

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Meir Medical Center
  • Provider of Information About this Clinical Study
    • Principal Investigator: Naomi Nacasch, Principle Invastigator – Meir Medical Center

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