For Peripheral Vascular Diagnostics

Select the model that best meets your needs!

The ideal high-end vascular system! Everything you expect from the market leading PVD system, and
much more!

The most advanced cost-effective vascular system! Ideal for routine day-to-day work and rapid ABI measurements!

The ultimate compact system for measurements without Doppler! Ideal for Phlebologists or smaller clinics.


Imagine what you would like to have in your ideal PVD system, and discover it in the FALCON!

















The FALCON products support numerous standard and unique features for the benefit of the medical staff and patients alike!

Blood Pressure

10 Independent Pressure Channels

  • Flexible configuration according to your needs!

  • Save time by measuring simultaneously

  • Color coded channels

  • Robust and reliable

Blood Pressure Measurements

  • Simple workflow

  • Automatic save and automatic cuff inflation

  • Supports both Doppler and PPG (Photoplethysmograph)

  • Complete replay with audible Doppler sound

  • Review and modify at any time!

Simultaneous ABI Measurements

  • Simultaneous measurement of selected segments

  • Automatic save and cuff inflation

  • Automatic detection of systolic pressures

  • Display of continued site perfusion

Enhanced Measurements

  • Clear display of PPG waveforms

  • Quick Zoom in and out

  • Systolic pressure verification with average perfusion signal

Doppler and Sensors

PPG Measurements

  • 5 completely independent PPG channels

  • Simultaneous Fingers/Toes Measurements

  • Color coded channels

  • High sensitivity

  • A variety of fingerclip, toe clip and disk type sensors

Disk PPG Sensors

  • Phasic and average waveform display

  • Attachment to the skin with dedicated stickers

  • Ideal for venous studies

  • Color coded sensors

Pulse Volume recording (PVR)

  • Up to 10 simultaneous measurements

  • Controllable scales

  • Display of contralateral measurements

  • Waveform calculations

Wide Probe Selection

  • High quality 4 MHz and 8 MHz probes for standard use

  • Unique 10 MHz probe Ideal for small peripheral blood vessels

  • Complete high resolution spectral analysis

  • Color coded probes

Temperature Sensor

  • Continuous monitoring of skin temperature

  • Ideal for diagnosis of the Raynaud’s Syndrome

  • Easily attached with dedicated adhesive stickers

Specialty Tests

Stress Tests

  • Supports exercise, cold immersion and reactive hyperemia

  • Large timer display

  • Insertion of event markers and descriptive comments

  • Ability to add test on-the-fly during a different protocol

  • Predefined list of onset of symptoms

Venous Reflux

  • Configurable step by step protocol

  • Automatic baseline and time cursors placement

  • Automatic VRT (Venous Refill Time) display

  • Bilateral measurements

  • Tourniquet support

Raynaud's Syndrome Diagnosis

  • Simultaneous measurement of all 5 fingers!

  • Measure with or without digit blood pressures

  • Integrated skin temperature sensor

  • Dedicated protocols

Thoracic Outlet Syndrome (TOS)

  • Configurable step by step protocol

  • Schematic pictures to guide through positions

  • Include pictures of symptomatic position

  • Supports PPG, Doppler and PVR

Palmar Arch Test (PAT)

  • Configurable step by step protocol

  • Automatic cursors to mark occlusion and release

  • Supports multiple PPG sensors on the examined hand

MVO/SVC (Maximal Venous Outflow / Segmental Venous Capacitance)

  • Configurable step by step protocol

  • Bilateral measurements

  • Automatic baseline, plateau and time cursors placement

  • Automatic index display

  • Controls over cuff pressures and calculation time

Penile Function

  • Supports Doppler, blood pressure, PVR and PPG measurements

  • Configurable step by step protocol

  • Allows simultaneous measurements with different sensors

Ease of Use

One Key Operation

  • Easily operate the system with one main key

  • Remain focused on the patient

  • Key function automatically adapts to current protocol

  • Use from touch screen, remote, foot switch, mouse or keyboard.

Interactive Screens

  • Large user-friendly touch-screen display

  • Everything on screen is interactive

  • Configurable screen display

Remote Control and Foot Switch

  • A selection of wired and wireless remote control

  • Keep your focus on the patient with a dedicated foot switch

  • Configurable buttons on remote and foot switch according required functions

Language Support

  • Falcon operation in your native language

  • Ensures optimal operation


Flexible Protocols

  • Easily configurable protocols

  • Support of unlimited number of protocols

  • Very friendly protocol editing!


Configurable Reports

  • Design your own report display

  • Customized hospital/clinic logo and details

  • Unlimited configuration of report templates

Analysis and Research Options

Comparison Charts

  • Quick review to highlight “at risk” locations

  • Customized alerts

  • Side to side and ipsilateral pressure differences

  • Pre/post stress comparison

Statistical Analysis

  • Built in statistics tool

  • Informative pie charts and advanced parameters comparison

  • Export statistical data to Excel

Export Data

  • Export to popular formats such as PDF, Excel, Word, JPEG and more

  • Export entire examinations

  • Research oriented exports such as Video clips, Matlab and raw data

Networking (DICOM/HL7/GDT) and Review Station

Network Connectivity

  • Easily configure connectivity with automated connection test

  • DICOM Worklist, Storage and Structured Report

  • HL7 Query, ADT, Orders and Reports

  • GDT Interface

Unlimited Review Stations

  • Unlimited number of review stations

  • Replay examinations with full spectrum and Doppler audio

  • Complete shared network database solution

  • Reanalyze and add interpretations to a finalized report


Upgrade your Old Nicolet Vasoguard!


The FALCON systems are the ideal upgrade to the now obsolete Nicolet Vasoguard systems, which used to be the vascular market leader for many years.

You will find many of the known features and options of the Nicolet Vasoguard available in the advanced and modern Falcon user interface, plus many more options that are designed to support routine and advanced clinical examinations around the world.

Option or Feature Nicolet Vasoguard FALCON/Pro
Pressure channels 10 10
Independent pressure channels 2 10
Color coded air tubes 5 10
Independent PPG channels 4 5
Doppler frequencies 4MHz, 8MHz 4MHz, 8MHz, 10 MHz
Support for TOS, PAT, MVO, VR, Stress tests
Doppler spectral analysis
Arm for air tubes
Display Standard Large Wide-Screen
Computer Bulky All-in-one
Touch screen operation
Camera support
Integrated skin temperature sensor
Simultaneous 5 digit pressure measurement for Raynaud’s diagnosis
Guided protocol for TOS with schematic pictures
Ability to review and modify examinations
Ability to review DC PPG signals
Integrated networking support for DICOM, HL7, SQL servers, GDT
Review workstations
Unlimited configurable protocols
Export to PDF, Excel, Movies, DAT, pictures
Configurable and advanced reports
Report templates
Advanced data backup options
Configurable remote control
Operation in multiple languages
Foot switch
Online help
Integrated service performance and calibration checks
Configurable user profile settings

Selected Testimonials

"LOVED the Falcon - quieter, more flexible, more capable, more sensitive - only praise - BLOWN AWAY…"


"Learning curve minimal. Loved the customization of the Falcon Pro and the Doppler is very good."


"It is a great machine. A very good job. Congratulations."


"Resounding SUCCESS! Very impressed with the system. It is outstanding!!!"


"A lot of persons worked with the Falcon from two hospitals. They all liked the Falcon and it’s ease of use."


"Very happy with the system, it is easy to use and performs well."


"We are all very happy and enjoying working with our new machines. Big supporter of the Falcon Pro."


"It is the best system I have ever seen."


"I like the system very much as it is so easy to use and better than others."


"Operation runs smoothly and swiftly. Falcon software is user friendly and unit operation and back up of data is straight forward."


"That is the equipment that we need. Great."


Contact us for additional testimonials from your country

Additional Reading

Inter-Society Consensus for the Management of Peripheral Arterial Disease

L. Norgren,a W.R. Hiatt,b J.A. Dormandy, M.R. Nehler, K.A. Harris, and F.G.R. Fowkes on behalf of the TASC II Working Group, Örebro, Sweden and Denver, Colorado

Read Article...

Practice Guidelines for the Management of Patients With Peripheral Arterial Disease

ACC/AHA 2005 Practice Guidelines for the Management of Patients With Peripheral Arterial Disease (Lower Extremity, Renal, Mesenteric, and Abdominal Aortic)

Read Article...

Guidelines for Noninvasive Vascular Laboratory Testing

Represented by Marie Gerhard-Herman, MD, MMSc, Julius M. Gardin, MD, FASE, Michael Jaff, DO, Emile Mohler, MD, Mary Roman, MD, and Tasneem Z. Naqvi, MD, FASE, RVT

Read Article...

Practice Guidelines: AHA Releases Recommendations on Ankle-Brachial Index Measurement and Interpretation

Am Fam Physician. 2013 Dec 15;88(12):866-867.

Read Article...

Objective Lower Extremity Arterial Plethysmographic Waveform Characteristics for Differentiating Significant Inflow Disease in Nondiabetic Patients

Robert P. Scissons, RVT, FSVU

Read Article...

Photoplethysmographic venous refilling times following ultrasound guided foam sclerotherapy for symptomatic superficial venous reflux: relationship with clinical outcomes.

Darvall KA, Sam RC, Bate GR, Adam DJ, Silverman SH, Bradbury AW.

Read Article...

2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease

A Report of the American College of Cardiology/American Heart Association

Read Article...

2017 ESC Guidelines on the Diagnosis and Treatment of Peripheral Arterial Diseases, in collaboration with the European Society for Vascular Surgery (ESVS)

Aboyans V, Ricco JB, Bartelink MEL, Björck M, et al.

Read Article...

Chronic Venous Insufficiency

Eberhardt RT, Raffetto JD.

Read Article...


The Segmental Blood Pressure (SBP) tests require the placement of dedicated pressure cuffs on the various limb segments, which typically include the 2 brachial segments, the thighs (some protocols divide the thigh into 2 separate segments), the segment below the knees, the ankles and the toes.

Additional segments can be measured, such as the digits for diagnosis of the Raynaud's Syndrome.

Prior to segmental cuff inflation, a reference signal is identified distal to the cuff location. This reference signal is typically a CW Doppler measurement or a PPG (Photo-Plethysmograph, used for the digits and toes).

Above is an example of a SBP measurement taken from Viasonix FALCON/Pro system using 8 MHz CW Doppler probe.

When the cuff pressure exceeds the systolic pressure, the reference signal waveforms should disappear. Then, the cuff pressure is slowly deflated at constant bleeding rate, and the first occurrence of the return of the reference signal waveform marks the systolic pressure. 

The clinician is normally interested in the ratio of the ankle systolic pressure to the brachial pressure (ABI – Ankle Brachial Index), or in significant pressure differences either in sequential segments or side-to-side differences for the same segment.


ABI, the Ankle Brachial Index, is the most popular application for fast and simple screening of a physiological vascular pathology. With this test pressure cuffs are placed on the 2 ankles and on 1 or 2 brachial segments.

The Viasonix FALCON/Pro allows to perform the ABI test with either Doppler or PPG sensors. In addition, the Falcon allows to perform simultaneous measurements in all sites under certain conditions for rapid measurements.

Prior to segmental cuff inflation, a reference signal is identified distal to the cuff location. When the cuff pressure exceeds the systolic pressure, the reference signal waveforms should disappear. Then, the cuff pressure is slowly deflated at constant bleeding rate, and the first occurrence of the return of the reference signal waveform marks the systolic pressure.

The ABI is defined as the ratio of the higher brachial pressure to each of the ankle pressures. A ratio of around 1 is considered normal, while lower values indicate various levels of significant peripheral arterial disease (PAD) according to international guidelines.

Above is an example of a ABI test performed on a patient using Viasonix FALCON/Pro. The sensor used in this case is 8 MHz Doppler probe.


Peripheral vascular Doppler measurements are normally performed using CW (Continuous Wave) Doppler probes.

Different Probe frequencies are used depending on the target vessels: 4 or 8 MHz are used for larger and deeper vessels such as the Carotid, Femoral or Popliteal arteries, and higher 8 or 10 MHz are used for the smaller and shallower vessels such as the Dorsalis Pedis or Tibial arteries.

The main objective is to qualitatively examine the waveform shapes: a normal peripheral artery (not in the carotids) will show 3 phases during a cardiac cycle, a prominent early systolic forward flow, a late systolic reverse flow, followed by a small component of forward flow again. This signifies a healthy elastic artery. As the vessel becomes less elastic (for example due to diabetes), the third and/or second phase will disappear.

In addition, significantly high velocities may indicate the presence of a stenosis or some other obstruction to the blood flow.

Example of a CW Doppler waveform measured using Viasonix FALCON/Pro


The Pulse Volume Recording (PVR) test is a pneumo-plethysmographic test used for detection of the segmental volume changes in the limb which result from the flowing blood, as a function of the cardiac cycle.

Similar to the Segmental Blood Pressure (SBP) measurements, dedicated pressure cuffs are placed around all limb segments prior to initiating the test.

Example of a PVR waveform measured using Viasonix FALCON/Pro

The cuffs are then inflated to a pressure that would occlude the venous return, yet will maintain the arterial flow un-obstructed. This pressure is typically 65 mmHg.

Once the cuff pressure is stabilized, the waveform signals which reflect the segmental volume changes can be recorded. The clinicians are normally interested in the qualitative shape of the waveforms: a "normal" PVR consists of a rapid systolic upstroke and a rapid downstroke with a prominent dicrotic notch.

With increasing arterial disease the PVR waveform becomes attenuated, the upstrokes and downstrokes are less prominent and the PVR amplitude decreases and ultimately becomes flat.


The Venous Reflux test is used to determine the competence of the superficial venous valves in the calves of the legs. This test is performed with a DC PPG sensor.

When performing Venous Reflux test, the patient is requested to sit upright with the legs not touching the ground. A Photo-plethysmograph (PPG) sensor is attached to the leg above the ankle in the region of the posterior tibial artery. When the DC signal reaches a steady state baseline, the patient is requested to perform multiple leg dorsiflexions which result in "pumping" of all of the venous blood. After the dorsiflexions the patient is requested to remain still, while the PPG DC signal returns back to the initial baseline.

Optionally, the test can be repeated with a cuff wrapped around a segment on the leg (thigh, above/below knee) acting as a tourniquet.

The duration from the end of the dorsiflexions (maximal signal change) until the signal return to baseline (VRT, Venous Recovery Time) indicates the status of the valves. A slow recovery time indicates competent valves, while a fast VRT would indicate a suspicion of valvular incompetency.

Above is an example of a Venous Reflux specialty test performed
on a patient with Viasonix FALCON/Pro. The Venous Recovery Time (VRT)
is an index of venous valve patency. A fast recovery time such as
in this example, indicates a suspicion of valvular incompetency.


The Photo-plethysmograph (PPG) test detects changes in segmental blood volume, in a similar manner to the Pulse Volume Recording (PVR) test. The PPG technology, however, is different than the pressure-sensor based PVR technology.

With PPG, infra-red signals are transmitted to the skin and reflected back to the sensor, therefore PPG waveforms reflect local and rather shallow skin variations in blood flow.

Typical PPG measurement sites are the toes and digits, and interpretation of the signals is in a similar manner to the interpretation of the PVR waveforms.

Example of a PPG waveform measured using Viasonix FALCON/Pro. The dicrotic notch is clearly visible on the waveform.


In order to differentiate different vascular disorders, or to determine the functional severity of a stenosis, some of the tests described above are repeated after induced stress.

Typically, the patient will be requested to perform treadmill or similar activity, under the supervision of the examiner.

Most of the time the stress testing will include Segmental Blood Pressures, particularly at the ankles and brachials, and sometimes also Pulse Volume Recording (PVR) and CW Doppler measurements.

Segmental pressures are often measured at different post-stress times to determine also the recovery time from the stress effects. The clinician is particularly interested in identifying significant variants from the resting pressure indices and specifically changes in the Ankle-to-Brachial Index (ABI).

Below is an example of a Segmental Blood Pressure measurement with induced stress (exercise in this case) performed using Viasonix FALCON/Pro. The table shows blood pressure measurements in pre-exercise and post-exercise conditions. It is common to take multiple measurements (cycles) in timed intervals after performing the induced stress. The stress graph below shows the recovery of each measured segment starting with pre-stress conditions until the last post-stress cycle.


The Thoracic Outlet Syndrome test is conducted in order to determine the vascular role when the patient's symptoms are indicative of loss of perfusion or neurogenic causes.

This procedure tests for intermittent loss of perfusion, particularly in the arms and hands.

Either Doppler, PVR or PPG sensors detect normal resting waveforms in the digits or hands and then the patient is instructed through a sequence of positions such as: Hands-up Test, Adson or Scalene Maneuver, Costoclavicular Maneuver, Allen Test, and Provocative Elevation Test.

Some of the different positions of Thoracic Outlet Syndrome specialty test supported in Viasonix FALCON/Pro.

The clinician tries to identify a position which significantly reduces perfusion to determine whether the symptoms originate from vascular causes.


Raynaud's disease is a rare disorder of the blood vessels, usually in the fingers and toes. It causes the blood vessels to narrow when you are cold or feeling stressed.

When this happens, blood can't get to the surface of the skin and the affected areas turn white and blue. When the blood flow returns, the skin turns red and throbs or tingles. In severe cases, loss of blood flow can cause sores or tissue death.

Primary Raynaud's happens on its own. The cause is not known. There is also secondary Raynaud's, which is caused by injuries, other diseases, or certain medicines.


The MVO/SVC test determines the Maximum Venous Outflow (MVO) and the Segmental Venous Capacitance (SVC).

The patient lies in a supine position with the legs slightly elevated. A venous occluding cuff is placed on the thigh and a Pulse Volume Recording (PVR) pressure cuff is placed on the calve.

Initially, the sensor (PVR or PPG) is measured and a baseline is determined. Then the thigh cuff is inflated to occlude the venous return (around 60 mmHg) and the changes in the sensor signal are recorded. Once a plateau is reached, the occluding cuff is rapidly deflated. The sensor signal also quickly returns back to the initial baseline. The clinician then determines MVO and SVC based on the sensor signal to determine venous functionality.

Above is an example of a Bilateral Maximum Venous Outflow (MVO)/Segmental Venous Capacitance (SVC) specialty test measured with Viasonix FALCON/Pro. Both legs were measured simultaneously. The graphs above show the complete measurements and the graphs below present a zoom-in on the deflation part (blue rectangle). The resulted MVO/SVC ratio is displayed on the schematic picture.


The Reactive Hyperemia test is allowed only in certain countries.

Stress testing is frequently used in peripheral vascular diagnosis to differentiate between different vascular disorders, or to determine the functional severity of an arterial stenosis. Systolic pressures are measured before and after inducing vascular stress. While typically the patient is asked to perform a physical exercise such as exercise on a treadmill, sometimes the patients have difficulties in performing exercise.

In special cases, the reactive hyperemia test (RH) can replace the standard exercise tests and induce vascular stress. RH requires to inflate a pressure cuff in order to occlude the blood flow to the limb or segment of interest for up to several minutes, and then rapidly releasing the cuff pressure in order to generate the hyperemic effect.

It is crucial that a professional examiner will be present near the patient at all time, and immediately deflate the pressure cuffs when necessary.


Penile function or impotence test is used for determination of whether penile function disorders are of vascular nature.

The Viasonix FALCON/Pro allows to use a variety of tests, including the simultaneous combination of different tests. Such tests include Doppler arterial measurements in the penile vessels, blood pressure measurements with a penile pressure cuff, and PVR or PPG waveform measurements.

The results of such tests can either identify a penile vascular problem, or eliminate vascular issues as the cause of impotence.


The Palmar Arch Test (PAT) is a specialty test performed to evaluate the patency of the Palmar arch in the hand prior to radial or ulnar artery harvesting in artery bypass procedures or before the surgical creation of an upper extremity hemodialysis fistula or graft.

Typically, 2 PPG sensors (photo-plethysmograph) are placed on the two extreme digits (digit 1 and digit 5). The FALCON/Pro allows placing even 5 PPG sensors on all five digits. The Palmar Arch Test protocol begins by measuring the resting PPG waveforms, then measuring the waveforms after selected compressions (compression of the radial artery, ulnar artery, or both) and finally measuring the waveforms after the release of the selected compression.

Compression is typically performed by manually compressing the selected artery or arteries. This procedure allows the examiner to evaluate whether the compression results in impeded or loss of blood flow to parts of the hand. Thus, significant reduction or loss of blood flow to areas of the hand suggests that removing that particular artery may jeopardize hand performance if the artery is removed.

Clear markers in the waveforms indicate when artery compression begins, and when the compression is released.

Above is an example of a Palmar Arch Test specialty test performed
on a patient using Viasonix FALCON/Pro. First Radial artery was compressed
on two extreme digits and then Ulnar artery was compressed on the same digits.


Extracranial examination is performed with Doppler measurements in the carotid and other extracranial vessels. These measurements focus on the measurement of peak and mean blood flow velocities in order to identify a vascular obstruction to flow, such as an arterial stenosis.

The common blood vessels during extracranial evaluation are the common, internal and external carotid arteries, as well as the subclavian artery. A measurement at the location of a stenosis will result in increased blood flow velocities.


Air Plethysmography (APG) test relates to the use of a pressure cuff as a sensor. The pressure cuff is inflated to a low pressure, such as around 20 mmHg for lymphatic occlusion or around 60 mmHg for venous occlusion, and then the resulting average cuff pressure serves as the sensing element and identifies limb changes.

APG is not a very popular test, because the use of the popular PPG sensors is very simple and easy to use, and is considered in many places the gold standard. Yet, the use of APG is found in places where PPG is not considered reliable enough.

The most popular application for APG is for the venous reflux test.