Flap Monitor

#moorVMS-TREND

Fully automated post-op flap monitoring with noise rejection, automatic alarms and easy case review

  • I cannot rate the company or the staff highly enough.

    Jim House, PhD
    University of Portsmouth

  • Laser Doppler Imager is a standard accurate method we now use in our cerebral blood flow and brain perfusion in our laboratory.

    Momoh A. Yakubu, PhD
    Texas Southern University

  • It goes without saying that the company's imaging technology itself is superb!

    Gourav Banerjee
    Leeds Beckett University

  • We have found Moor equipment to be extremely dependable and innovative.

    Dean L. Kellogg, Jr., MD, Ph.D
    University of Texas Health Science Center

  • I expect to be using Moor Instrument’s technology for many years to come!

    Faisel Khan, PhD
    Ninewells Hospital & Medical School

  • Moor Instruments have consistently provided excellent help and support for my research.

    Kim Gooding, PhD
    University of Exeter Medical School

  • In a nutshell, moorFLPI-2 is the most user-friendly system for studying cerebral blood flow regulation in rodents.

    Chia-Yi (Alex) Kuan, MD, PhD
    Emory University School of Medicine

  • We can't recommend Moor instruments highly enough. The technology is at the cutting edge and the support second to none.

    Paul Sumners, PhD
    London South Bank University

Assistance For Post Operative Monitoring Free flaps, replants and transplants depend on tissue blood flow and oxygenation for survival and lasting health. These essential parameters are monitored by you with the moorVMS-TREND system, over the important minutes, hours and days post-op.

The moorVMS-TREND system enables accurate and sensitive measurements of microvascular blood flow, oxygenation and temperature to be made in the minutes, hours and days post surgery and can help to provide early warning of potential complications post surgery. Automation has been in-built. Baseline sampling, noise rejection, graphical trend display, alarm levels and alerts are all automated, leaving the system as easy to use as possible.

Central to the system is the moorVMS-TREND software package that will display traces from your preferred combination of blood flow, temperature and/or tissue oxygenation probes. Probes are available for surface, buried and oral flaps (tissue oxygenation and temperature probes are surface only). The large, clear graphical display shows smoother long term trending. In addition, “live” traces can be viewed to assess pulsatility and vasomotion status. A mobile clinical cart is also available as an optional extra to provide convenient housing and mobility of monitors, PC interface and probes.

The following products are AVAILABLE TO BUY ONLINE and work with the moorVMS-TREND


This section lists the more common questions our customers have with regards to the moorVMS-TREND. If you have a question you would like answered that does not appear below then please email us. We are happy to help!


Q. What parameters can I monitor with moorVMS-TREND?
A. moorVMS-TREND enables you to connect your preferred combination of 1 or 2 LDF and 1 or 2 OXY channels. This enables you to monitor microvascular blood flow, tissue oxygenation and temperature. Using the combined skin probe, CP1T, all parameters are sampled with one probe head. Tissue blood flow in buried flaps can also be sampled with implanted probes (tissue blood flow only).

Q. What type of flaps can I monitor?
A. Probes are available for exposed surface flaps and replants (use VP1T, CP1T or OP1T), flaps covered by dressings (use VP11sc), buried flaps (use side or end viewing endoscopic designs, VP6b or VP6ds) or oral flaps (use VP8c suturable titanium disc probe). Other probes can be used in other situations should the moorVMS-TREND protocol prove useful. Probes are re-usable and designed to withstand at least 5 sterilisation (Sterrad) cycles.

Q. What is the longest period of time the moorVMS-TREND can record data for?
A. The system is capable of continuous monitoring sessions of days.

Q. Is the system easy to use?
A. Yes, much of the software has been automated and the remainder is intuitive to make the package easy and instinctive to use. The system features easy to read numerical and trend/fast graph displays.

Q. How are the alarm levels set?
A. Alarm levels are set automatically by the monitor after 30 minutes of baseline assessment. A visual alarm shows whenever blood flow and/or tissue oxygenation drop below the alarm level and an audible alarm sounds if low flow and / or oxygenation are sustained for a pre-defined period. The alarm level is set as a chosen percentage or absolute of the measured baseline level. Manual override is available.

Q. How does the trace differ from a normal laser Doppler trace?
A. The trace is much smoother than a normal laser Doppler trace yet still sensitive to rapid changes. This is due to the use of a novel noise rejection protocol, making the traces far easier to view. Temporary live monitoring is also available to allow confirmation of pulsatility and vasomotion in the signal. Tissue oxygen and temperature monitoring are also available for additional information on tissue health.

Q. Can the trace be analysed and exported?
A. Yes. Report templates are available to simplify and automate the process. Data can also be easily exported for further processing in proprietary software packages. A patient database is included to organise and manage numerous monitoring sessions.

There are numerous references where our laser Doppler monitors are cited. The list below is a small selection. Please contact us for reference lists on your chosen subject.


Dorai, A. 2006.
Laser doppler monitoring of free flaps in reconstructive microsurgery.
Malays J Med Sci. 2006 January;, (13(1)), pp.79–96.

Figus , A., Mosahebi , A., and Ramakrishnan , V., 2006.
Microcirculation in DIEP flaps: a study of the haemodynamics using laser Doppler flowmetry and lightguide reflectance spectrophotometry.
Journal of plastic, reconstructive & aesthetic surgery: JPRAS, 59(6), pp.604–12; discussion 613.

Moor Instruments manufacture a wide range of probes designed to help you assess flow from almost any tissue. We are more than happy to advise on your particular application but hope too that the following general notes are useful.


Skin probes are available with two main fibre configurations, twin or multi-fibre designs. Multi fibre designs usually contain a ring of up to eight collecting fibres around a central delivery fibre. This provides an averaged signal for a larger tissue area than would otherwise be provided by the conventional twin fibre model.

Skin probes are usually fixed to the skin with a probe holder and double sided adhesive discs, although they can be used in other applications (e.g. bone, visceral measurements) and with other equipment (e.g. Iontophoresis). Please refer to the Accessories and Iontophoresis catalogues.
moorVMS-TREND users can specify combined laser Doppler and temperature probes.

The standard length for all probes is 2 metres. Longer lengths can be supplied on request (code PXL). The range of probe holders for these (and other) probes is described in the accessories page.

Needle probes are amongst the most versatile designs. They can be used for surface measurements, inserted into tissue or used for single vessel measurements. The compact design also lends itself to measurements in tissues with restricted access, e.g. teeth, conjunctiva and where micromanipulation is required.

Probes can be fixed in position over tissue with a normal laboratory manipulator by clamping onto the black acetal shank.

Deeper measurements are possible by inserting the probe tip into tissue bulk, for which finer needles are suitable (DP4s). The finest needles can be inserted directly with the application of gentle pressure. Larger needles can still be used although it may be necessary to puncture the tissue first.

The use of specific probe holders can extend the application range of needle probes further still. Wet stick probe tips can be used to aid adhesion to moist/ mucosal surfaces. Dental putty can be used to create an individual probe holder for tooth measurement. Angled needle probes can be used to access hind teeth.

Although laser Doppler is not usually advocated for assessment of flow in single vessels, there is a role for the technique in the assessment of flow changes in small individual vessels. Moor manufactures a range of probe holders to aid this measurement.

Endoscopic probes enable internal investigations of blood flow in tissue beds such as colon, bronchus and urethra. The probes are available in a wide range of diameters to fit the biopsy channel of most endoscopes. All are made from a flexible yet tough nylon sleeving.

The finer diameter probes, although generally more delicate, can be used with some naso-gastric tubes: the tip of the n.g. tube is removed to allow an end viewing probe to protrude for measurement.

The standard length for all endoscopic probes is three metres. Longer lengths can be supplied and are particularly useful for larger animals (e.g. horses)

Low profile designs are either used where access is difficult (e.g. oral mucosa) or to reduce application pressure if the probe is to be covered by bandages. Various designs are available, including the titanium disc probe and the near flat silicon probe.