LigaSure vs Harmonic is one of the most common comparisons in surgical energy. Both product lines seal and divide tissue, both are single-use and both are used across general, gynecologic, colorectal and thoracic surgery. The difference is how they deliver energy. This guide explains that difference in plain terms, walks through the models in each line and lists what purchasing teams should confirm before ordering.
How LigaSure works
LigaSure is Covidien’s (Medtronic) advanced bipolar vessel sealing technology. The instrument clamps tissue between its jaws and delivers controlled radiofrequency energy while the generator monitors the tissue, then most models use a built-in blade to divide the sealed tissue. Because the energy passes between the two jaws, LigaSure is described as bipolar.
How Harmonic works
The Harmonic scalpel is Ethicon’s ultrasonic line. Instead of passing electrical current through tissue, the active blade vibrates at ultrasonic frequency, creating friction that cuts and coagulates at the same time. Harmonic shears are often chosen for precise dissection.
LigaSure vs Harmonic at a glance
| LigaSure | Harmonic | |
|---|---|---|
| Manufacturer | Covidien (Medtronic) | Ethicon |
| Energy type | Bipolar radiofrequency with jaw pressure | Ultrasonic vibration |
| How it divides tissue | Integrated blade on most models | The vibrating blade cuts as it coagulates |
| Generator | Covidien Valleylab FT10 or ForceTriad for most current models | Ethicon Generator G11 for current shears |
| Popular models | Maryland jaw (LF1937), Exact (LF2019), Blunt Tip, Impact, Small Jaw | ACE, ACE 700, HD 1000i, Focus |
Popular LigaSure models
- Maryland jaw (LF1923, LF1937, LF1944): a curved, tapered jaw in 23cm, 37cm and 44cm lengths.
- Exact dissector (LF2019): a slim curved jaw for open dissection.
- Blunt Tip (LF1823, LF1837, LF1844) and Impact (LF4418) for larger tissue bundles.
Popular Harmonic models
- Harmonic ACE and ACE 700 (HAR23, HAR36, HAR736, HAR745): curved shears in several lengths.
- Harmonic HD 1000i (HARHD20, HARHD36): designed for sealing larger vessels.
- Harmonic Focus (HAR9F, HAR17F): shorter shears for open procedures such as thyroid surgery.
Other advanced energy options
LigaSure and Harmonic are not the only choices. Ethicon’s Enseal X1 is an advanced bipolar tissue sealer, Covidien’s Sonicision is a cordless ultrasonic dissector, and Medtronic’s Aquamantys sealers use radiofrequency energy with saline, mainly in orthopedic and spine procedures. You can compare them in our vessel sealing, ultrasonic device and bipolar device categories.
Which should your facility stock?
The choice between LigaSure and Harmonic is a clinical one for your surgeons, and many hospitals stock both. From a purchasing standpoint, the deciding factors are usually:
- Your generators: both lines require a compatible generator, so your installed capital equipment often decides which line you buy.
- Surgeon preference: surgeons tend to standardize on the jaw style and length they know.
- Procedure mix: open, laparoscopic and robotic cases may call for different models and shaft lengths.
- Contracts and backorders: when a primary supplier is on backorder, a secondary source for the same reference number keeps cases on schedule.
Tips for ordering advanced energy devices
- Reorder by reference number, which encodes the model and length, such as LF1937 or HAR36.
- Confirm whether a Harmonic model needs a separate hand piece or has an integrated one.
- Check the purchase unit; some devices are sold individually and others by the box.
- Any reprocessed device should be clearly labeled as reprocessed; confirm your facility’s policy before ordering one.
Always follow the manufacturer’s instructions for use. To check availability on several reference numbers at once, paste them into our SKU availability checker, or browse all energy and electrosurgery devices.
