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FMwand Hemostatic Dissector

FMwand Hemostatic Dissector

Domain Surgical’s FMwand is an intelligent thermal dissection device that precisely cuts and coagulates with a fraction of the tissue injury compared to monopolar electrosurgery1, without passing any electrical current through the patient.

Precise Dissection

FMwand produces a precise, surface-only thermal effect with tactile control and minimal tissue drag, even through dense adhesions and tumors. The clean dissection results in clear margins for reliable pathology specimens.

Minimal Thermal Injury

Imparts as little as 1/10th the thermal injury compared to monopolar electrosurgery, with as few as 80 microns (0.08 mm) of thermal spread in some tissue types.1,3

Electrical Silence

No electrical current passes through tissue. No grounding pad is used, and no spark, arcing, or stray current is produced. Surgeons using the FMwand report no generation of cardiac dysrhythmia, and no interference with electrophysiological monitoring, ultrasound imaging, cochlear implants, or CIEDs.1,2

Predictable Control

Predictable, char-free layer-by-layer dissection with optimal visualization of tissue planes in all soft tissues, including muscle and adipose, even in wet environments.

Patient Safety

No potentially dangerous electrical current passes through the patient. FMwand is safe to use near nerves, vessels, and all delicate organs – including the heart – as well as near electrically sensitive implanted devices.


Improved Outcomes

  • Reduction of injury to nerves5
  • Less unintended damage to tissue3 – leading to reduced use of blood products during surgery6
  • Less post-operative edema and drainage6

Videos of the FMwand in Action

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FMwand Handpiece Design

Handpiece Design

FMwand is available in 100 mm and 150 mm lengths and features dual activation modes: MAX mode for uniform hemostatic dissection in most tissue types, and MIN mode for fine dissection, spot cautery, and pre-treating vessels. Power levels can be independently set for each activation mode from 5 to 60 Watts. An onboard microprocessor continuously monitors and adjusts closed-loop delivery of thermal energy 200 times per second. A patented integrated active cooling system ensures localization of heat at the tip and rapid cool down.

Dissection Loops

Each FMwand handpiece incorporates a non-stick dissection loop, which is available in several shapes and sizes. Heat is  created uniformly around the circumference of the loop. Each loop activates instantly, cools in seconds, and can be rotated 180°.

FMwand Loops
FMwand with Smoke Evacuation

Integrated Smoke Evacuation

Certain FMwand models include an optional integrated smoke evacuation channel and a removable cap; integrated smoke evacuation is available in all of the same lengths as standard FMwand. Smoke evacuation tubing connects to a dedicated smoke evacuation system, or to other hospital suction source.

FMX Power Modules

FMX Power Modules connect the FMwand to the FMX Generator and intelligently manage communication between each component within the system. FMX Power Modules are available in both reusable and single-use disposable configurations. The FMX Reusable Power Module (left) can be autoclave resterilized for use in up to 100 procedures. The FMX Disposable Power Module (right) is single-use only and is discarded following each surgical procedure.

FMX Power Modules

Related Downloads and Additional Resources

Clinical Outcomes That Truly Make a Difference

Reduced Thermal Injury

Comparative incisions were made in pig liver at equal depth using both monopolar electrosurgery (left) and FMwand (right). Histology data were analyzed to measure the exact depth of incision (thick black line), and the area of collateral thermal injury (orange area). FMwand resulted in as little as 1/10th the amount of total thermal injury when compared to monopolar electrosurgery.1,3

FMwand Thermal Injury

Magnification on both images is the same.

Maximum Tissue Temperature Comparison

Thermal images of incisions made in rabbit muscle were analyzed to measure the maximum tissue temperature at the incision site 0.1 second following power deactivation of both monopolar electrosurgery and the FMwand. Monopolar electrosurgery (left) maximum tissue temperature was 132.9° C, while the FMwand (right) maximum tissue temperature was 78.1° C.1

FMwand Temperature Comparison
Electrical Silence

Unlike monopolar electrosurgery, which conducts electrical current through the patient, the FMwand uses pure thermal heat to cut and coagulate tissue. No grounding pad, no spark, no arcing, and no stray current. The EKG chart shown below is from an actual surgery. The upper chart shows electromagnetic interference caused when using monopolar electrosurgery, and the lower chart shows no interference when using the FMwand during the same surgery.1

Electrical Silence

Upper chart: monopolar electrosurgery. Lower chart: FMwand

Improved Healing Outcomes

Comparative incisions were made in rabbit paraspinous muscle using monopolar electrosurgery and the FMwand in order to compare healing properties of different technologies. After 14 days, incisions made with monopolar electrosurgery (left) showed dramatic evidence of injury, while FMwand incisions (right) showed evidence of superior healing.4

Improved Healing Outcomes

Setup is Incredibly Simple

The FMX Ferromagnetic Surgical System combines state-of-the-art surgical technology with unparalleled ease-of-use. Prepare FMX instruments for use by following these simple steps:


Plug the FMX Power Module into the front panel of the FMX Generator



Snap the power module into the back of the FMX instrument




Set the power settings on the generator and the system is ready


  1. Internal data on file.
  2. Weiss, J. Peter Manwaring, Preston et al. Freedom from electromagnetic interference between cardiac implantable electronic devices and the FMwand ferromagnetic surgical system. Journal of Clinical Anesthesia , Volume 25 , Issue 8 , 681 – 684.
  3. MacDonald, J.D., Bowers, C.A., Chin, S.S. et al. Comparison of the effects of surgical dissection devices on the rabbit liver. Surg Today (2014) 44: 1116. doi:10.1007/s00595-013-0712-4
  4. Bowers, Christian A. et al. Comparison of tissue effects in rabbit muscle of surgical dissection devices. International Journal of Surgery , Volume 12 , Issue 3 , 219 – 223
  5. Shinkawa T, Holloway J, Tang X, Gossett JM, Imamura M. A ferromagnetic surgical system reduces phrenic nerve injury in redo congenital cardiac surgery. Interact CardioVasc Thorac Surg 2017; doi:10.1093/icvts/ivw444.
  6. Retrospective Cohort Study Comparing Redo Operations Using Ferromagnetic Dissection and Conventional Monopolar Dissection. Joanne P. Starr, MD, Richard N. Gates, MD, Brian A. Palafox, MD, Allison Quill, RN, BSN. Surgical Innovation Vol 23, Issue 5, pp. 511 – 514

Need More Information?

Our customer service team is available to answer any questions that you may have, or to schedule an in-office demonstration of our advanced-energy surgical technologies.