Non-Invasive Pulse Wave Tonometer

Millar's SPT-301 Pulse Wave Tonometer enables simple, non-invasive assessment of the cardiovascular system by delivering high-fidelity blood pressure waveforms from direct skin contact with the carotid, femoral or radial artery. A proven method for reproducing high-fidelity arterial blood pressure waveforms, the tonometer provides both medical researchers and clinicians with valuable data to better understand cardiovascular health risks.

Our Pulse Wave Tonometer easily integrates into most standard blood pressure monitoring systems. Once connected, the device can immediately output non-invasive blood pressure waveforms from the carotid, femoral and radial arteries. Used in parallel, the signals from two separate tonometers can derive pulse wave velocity as a measure of arterial stiffness to evaluate a specific patient group or cardiovascular event.

A product shot of Millar's Pulse Wave Tonometer

Accurate Data to Analyze PWV and Arterial Stiffness

Pulse wave velocity (PWV) and arterial stiffness measured with the tonometer can be used to better understand patient risk for heart disease, stroke and dementia in certain populations.

Pulse wave velocity is a measure of arterial stiffness or the rate at which pressure moves down the vessel. To derive pulse wave velocity as a measure of arterial stiffness, the signals from two separate tonometers can be evaluated using the foot-to-foot flow wave velocity method1.

Additionally, assessment of arterial stiffness via waveform analysis delivers data visibility for the augmentation index, augmented pressure and reflected wave magnitude.

References 1. Yasmin, M.J. Brown; Similarities and differences between augmentation index and pulse wave velocity in the assessment of arterial stiffness, QJM: An International Journal of Medicine, Volume 92, Issue 10, 1 October 1999, Pages 595–600,

Tonometer Product Specifications

Product Reference 808-1019
Sensor Type Diffused Semiconductor
Length 6 in
Pressure Range 0 to +300mmHg (0 to 40 kPa)
Overpressure +4000 mmHg (+530 kPa), -760 mmHg (100 kPa)
Sensor Sensitivity 5 µV/V/mmHg, nominal (37.6 µV/V/kPa)
Pressure Connector Viking
Material Stainless Steel
Tip Nylon
Sensor Sensitivity 1/4" Diameter
# of Sensors 1
Use Life Reusable - Non-Sterile
Repair Life 3 years

SPT-301 Pulse Wave Tonometer Applications

The Millar SPT-301 Pulse Wave Tonometer can be used to evaluate cardiovascular function, in various health conditions including:

  • Heart failure
  • COPD
  • Hypertension
  • Diabetes
  • Arteriosclerosis
  • Blood Circulation Status

An over-the-shoulder shot of a scientist looking into a microscope at a lab table

More Information on the Pulse Wave Tonometer

Download the SPT-301 Non-Invasive Pulse Wave Tonometer information sheet to learn more about Millar's SPT-301 Pulse Wave Tonometer.

Publications Cite Pulse Wave Tonometer

Novel Methods for Pulse Wave Velocity Measurement -- in Journal of Medical and Biological Engineering, October 14, 2015

Effects of AntiEffects of Antihypertensive Drugs on Central Blood Pressure in Humans: A Preliminary Observation -- in American Journal of Hypertension, August 2013

Cyclooxygenase inhibition augments central blood pressure and aortic wave reflection in aging humans -- in American Journal Physiol Heart Circ Physiol June 15, 2012

Indications for Use Statement

The Mikro-Tip® Pulse Transducer can be used when measuring non-invasive high-fidelity pressure waveforms from the carotid, femoral and radial artery. Additional contraindications, precautions and warnings are referenced in the Instructions for Use available under the Knowledge Center. This product is not available for sale in the EU.

50 Years of Millar Innovation

In 1988, Millar introduces the first non-invasive pulse tonometer.


Contact Millar

Contact a Sales Rep or call Millar at +1 832.667.7000 to learn more about our SPT-301 Pulse Wave Tonometer.

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