LigaSure
LigaSure is a family of feedback-controlled bipolar vessel sealers for open and laparoscopic surgery. Jaw compression and radiofrequency energy produce tissue fusion; many handpieces also incorporate a mechanical cutter. Manufacturer specifications describe sealing vessels up to and including 7 mm for the relevant devices. Confirm the exact handpiece and generator instructions; animal sealing experiments do not authorize larger vessels.[1][2]
Handpiece Selection
| Family/example | Distinguishing consideration |
|---|---|
| Maryland jaw LF1937 / LF1944 | 5 mm shaft with a curved jaw and 350° shaft rotation, not an articulating wrist; 37/44 cm working lengths. Sterile, single use.[1] |
| XP Maryland, thoracic Maryland, blunt-tip and retractable L-hook devices | Different jaw dimensions, shaft rotation and generator compatibility. Some add another energy function.[2] |
| Open handpieces (for example Impact and small-jaw designs) | Match jaw length, exposure and tissue capture to the task; a shared brand name does not make open and laparoscopic handpieces interchangeable. |
| Laparoscopic 10 mm (Atlas) and 5 mm fine-jaw (Exact) handpieces | Manufacturer family names; confirm current specifications for the exact catalog item. |
A curved Maryland jaw can assist blunt dissection, grasping, sealing and mechanical division. It does not replace cold fine scissors for every plane or make traction on vulnerable tissue atraumatic.[1]
Mechanism and Safe Use
Bipolar current passes through patient tissue between the jaws, generally without a separate dispersive return pad. The generator senses tissue impedance, adjusts delivery and ends the cycle automatically, and an audible tone marks completion of the seal. Compression plus radiofrequency energy fuses the vessel wall, and an integrated blade divides tissue between the sealed jaws on most instruments. Localized current does not eliminate heat outside the jaws or all implanted-device concerns. For pacemakers and defibrillators, apply the procedure-specific device plan described in Energy Devices.[3]
Before division, obtain exposure, identify the vessel and adjacent structures, and ensure that the captured tissue is appropriate for that handpiece. Observe the model-specific activation feedback and instructions for an incomplete seal. Do not cut merely because activation has stopped.
The manufacturer's thoracic Maryland instructions illustrate several consequential points: tissue must be fully captured without overpacking, clips or staples must not be incorporated, and the sealing cycle must complete before cutting. That model's instructions allow overlapping adjacent seals when a double seal is chosen; therefore a blanket rule that all repeat or adjacent sealing is prohibited would also be incorrect. Follow the actual device's instructions.[4]
Reconstructive Role
A sealer can replace clamp-and-tie for named pedicles and broad vascular planes when vessel caliber is within the labeled limit. Uses that have been described include:
- Cystectomy with diversion and exenteration. Lateral and posterior bladder pedicles, vesical vessels, vaginal cuff vessels and mesenteric windows during bowel harvest.
- Nephroureterectomy for reconstructive indications, such as a nonfunctioning kidney from UPJ obstruction, refractory reflux or end-stage stricture disease. Hilar control uses a stapler, and bladder-cuff and distal ureteral hemostasis can use the sealer.
- Sacrocolpopexy and apical reconstruction. Peritoneal incision and lateral pelvic dissection.
- Vaginal hysterectomy at the time of pelvic floor reconstruction. Uterosacral, cardinal and uterine artery pedicles.
- Fistula takedown and mesh excision through dense or irradiated tissue, where monopolar fulguration would risk thermal injury to urethra, ureter or bowel.
- Vaginoplasty and gender-affirming surgery. Perineal dissection and flap mobilization, with cold dissection at the neurovascular bundle itself.
- Reservoir-pocket dissection for AUS and IPP.
The operation and anatomy determine whether a pedicle should be divided. Protect the blood supply of bowel, ureter and reconstructive flaps, and use clips, sutures, staplers or vascular techniques when appropriate.
Avoid presenting LigaSure as a default solution for presacral bleeding, blind scar division, periureteral hemostasis or dissection beside a neurovascular bundle. Heat, jaw compression and imperfect visualization remain relevant. Cold dissection and nonthermal hemostasis may better preserve vulnerable structures.
Seal Strength and Thermal Spread
In a porcine model, the 5 mm laparoscopic LigaSure sealed arteries up to 6 mm and veins up to 12 mm at supraphysiologic bursting pressure. Thirteen arteries of 6 mm or less had a mean bursting pressure of 662 mmHg (range 363 to 1,985), and 11 veins of 12 mm or less had a mean of 233 mmHg (range 63 to 440). Collateral tissue damage extended 1 to 3 mm from the application site. The ultrasonic shears did not reliably seal vessels larger than 3 mm in that model and produced the least acute collateral injury (0 to 1 mm).[5] These animal data do not extend the labeled vessel diameter or guarantee clinical seal integrity.
In a laboratory study of instruments for robot-assisted surgery, the critical thermal spread was 2.8 mm for LigaSure forceps and 2.9 mm for the ultrasonic instrument at 60 W for 1 second, compared with more than 20 mm for monopolar instruments at 2 seconds. Spread depends on power and application time, and an additional Maryland clamp used as a heat sink reduced it.[7] A stated spread of "less than 2 mm" is therefore not a universal safe working margin. Recently activated jaws and steam can also injure adjacent tissue, and the jaw tips stay hot for several seconds after activation.
Clinical Evidence
| Setting | Comparison | Finding |
|---|---|---|
| Thyroidectomy (meta-analysis of 4 randomized and 5 nonrandomized trials, 927 patients) | LigaSure vs conventional ligation | Operative time was shorter by about 12 minutes; blood loss, hospital stay and complication rates did not differ significantly.[8] |
| Curative gastric cancer resection (matched-pair analysis) | LigaSure vs conventional | Operative time 156 vs 183 minutes; blood loss 181 vs 236 mL; hospital stay 11.9 vs 13.6 days; morbidity and long-term oncologic outcomes did not differ.[9] |
| Splenectomy (systematic review and meta-analysis) | LigaSure vs conventional | Blood loss lower by about 49 mL and operative time shorter by about 11 minutes; conversion, hospital stay, morbidity and transfusion did not differ.[10] |
| Sarcoma surgery (retrospective, case-matched) | LigaSure vs conventional | Lower blood loss and transfusion volume.[11] |
| Thoracoscopic lobectomy (randomized, 107 per arm) | LigaSure vs monopolar electrocoagulation | Drainage volume, esophageal temperature change and C-reactive protein did not differ; more lymph nodes were removed with LigaSure.[12] |
| Abdominal hemostasis (systematic review of 7 randomized trials, 554 patients) | Vessel-sealing devices vs other electrothermal and ultrasonic devices | LigaSure was favored for blood loss, operating time or cost in two studies and did not differ in the others; wider randomized trials are needed.[13] |
| Laparoscopic colectomy (Cochrane, 6 trials, 446 participants) | Energy instruments | Operating time was shorter with bipolar vessel sealing than with monopolar instruments; no definitive cost conclusion; staplers and clips had more ligation failures than bipolar sealing.[6] |
| Vaginal hysterectomy (meta-analysis of 7 randomized trials, 662 patients) | Vessel sealing vs clamping and suturing | Operative time shorter by 17.2 minutes, blood loss lower by 47.7 mL and stay shorter by 0.25 days; complications did not differ.[15] |
| Vaginal hysterectomy with uterosacral apical suspension (randomized, 95 patients) | LigaSure vs clamping and suturing | Pain at 3 to 6 hours, hysterectomy time (40.5 vs 38 minutes), blood loss (100 vs 100 mL) and pain or narcotic use to 2 weeks did not differ.[16] |
An initial series of 98 cases (46 laparoscopic, 52 open) found that an alternative ligation technique was needed for bleeding in 13 of more than 4,200 applications (0.3%). Open procedures were about 39 minutes shorter and laparoscopic procedures about 8 minutes longer than with conventional methods.[14]
Across these settings, the studies report shorter operative time or less blood loss in some comparisons and no difference in major complications. Device cost per case is higher than for conventional bipolar cautery, and whether reduced blood loss and operating time offset it is not settled.[13]
Comparing Vessel Limits
| Device | Relevant distinction |
|---|---|
| LigaSure | Model-specific labeling commonly permits vessels up to 7 mm. |
| Harmonic | Limits vary by product and mode; ACE+7 has a 7 mm Advanced Hemostasis indication. Do not assume all ultrasonic devices stop at 5 mm or share that 7 mm indication. |
| Vessel Sealer Extend | Up to 7 mm; mechanical division. |
| SynchroSeal | Up to 5 mm; RF division. |
No device in this comparison is universally safest beside nerves or ureter. The instrument's instructions, tissue condition, exposure and technique matter more than a generic ranking.
Limitations
- The blunt jaw limits sharp dissection compared with scissors or a cold blade. The Maryland design narrows but does not remove this gap.
- The labeled vessel ceiling is about 7 mm. Larger pedicles, such as the renal vessels, common iliac branches and large mesenteric trunks, need stapler or suture control.
- Repeat sealing of the same site, or activation on partly desiccated tissue, can degrade seal quality unless the model's instructions permit it. Let the seal cycle finish before regrasping.
- Keep the jaws clear of the ureter, bowel serosa and neurovascular bundles during retraction while they are hot.
Historical Context
LigaSure was developed by Valleylab (later Covidien, now Medtronic) as an impedance-feedback bipolar sealer intended to replace clamp-and-tie hemostasis for named pedicles. An early clinical series reported that it could serve as the sole means of vessel ligation in colon, small bowel and gastric operations.[14] The robotic Vessel Sealer Extend and SynchroSeal apply similar bipolar sealing on the EndoWrist platform.
See also: Gerald Bipolar, Electrosurgical Pencil, Energy Devices.
References
1. Medtronic. LigaSure Maryland Jaw Sealer-Divider with Nano-Coating. Manufacturer specifications. Accessed September 2026.
2. Medtronic. LigaSure portfolio specifications. Manufacturer information sheet. See also Maryland FDA-clearance announcement and 7 mm specification.
3. American Heart Association. Periprocedural management and multidisciplinary care pathways for patients with cardiac implantable electronic devices. Circulation. 2024. doi:10.1161/CIR.0000000000001264.
4. Medtronic. LigaSure Maryland Jaw Thoracic Device: tips and information. Manufacturer guidance.
5. Landman J, Kerbl K, Rehman J, et al. Evaluation of a vessel sealing system, bipolar electrosurgery, harmonic scalpel, titanium clips, endoscopic gastrointestinal anastomosis vascular staples and sutures for arterial and venous ligation in a porcine model. J Urol. 2003;169(2):697-700. doi:10.1097/00005392-200302000-00067.
6. Tou S, Malik AI, Wexner SD, Nelson RL. Energy source instruments for laparoscopic colectomy. Cochrane Database Syst Rev. 2011;CD007886. doi:10.1002/14651858.CD007886.pub2.
7. Hefermehl LJ, Largo RA, Hermanns T, et al. Lateral temperature spread of monopolar, bipolar and ultrasonic instruments for robot-assisted laparoscopic surgery. BJU Int. 2014;114(2):245-252. doi:10.1111/bju.12498.
8. Yao HS, Wang Q, Wang WJ, Ruan CP. Prospective clinical trials of thyroidectomy with LigaSure vs conventional vessel ligation: a systematic review and meta-analysis. Arch Surg. 2009;144(12):1167-1174. doi:10.1001/archsurg.2009.201.
9. Zhou H, Yi W, Zhang J, et al. Short- and long-term outcomes of LigaSure versus conventional surgery for curative gastric cancer resection: a matched pair analysis. Gastric Cancer. 2015;18(4):843-849. doi:10.1007/s10120-014-0418-3.
10. Huang L, Yu Q, Peng H, Zhen Z. LigaSure technique for splenectomy: a systematic review and meta-analysis. Medicine (Baltimore). 2023;102(35):e34719. doi:10.1097/MD.0000000000034719.
11. Levine NL, Zhang Y, Hoang BH, et al. LigaSure use decreases intraoperative blood loss volume and blood transfusion volume in sarcoma surgery. J Am Acad Orthop Surg. 2019;27(22):841-847. doi:10.5435/JAAOS-D-18-00144.
12. Gabryel P, Kasprzyk M, Roszak M, et al. Comparison of the LigaSure bipolar vessel sealer to monopolar electrocoagulation for thoracoscopic lobectomy and lymphadenectomy: a prospective randomized controlled trial. Surg Endosc. 2023;37(6):4449-4457. doi:10.1007/s00464-023-09892-0.
13. Janssen PF, Brölmann HA, Huirne JA. Effectiveness of electrothermal bipolar vessel-sealing devices versus other electrothermal and ultrasonic devices for abdominal surgical hemostasis: a systematic review. Surg Endosc. 2012;26(10):2892-2901. doi:10.1007/s00464-012-2276-6.
14. Heniford BT, Matthews BD, Sing RF, et al. Initial results with an electrothermal bipolar vessel sealer. Surg Endosc. 2001;15(8):799-801. doi:10.1007/s004640080025.
15. Kroft J, Selk A. "Energy-based vessel sealing in vaginal hysterectomy: a systematic review and meta-analysis." Obstet Gynecol. 2011;118(5):1127-1136. doi:10.1097/AOG.0b013e3182324306
16. Ray MM, Crisp CC, Pauls RN, et al. "Use of a vessel sealer for hysterectomy at time of prolapse repair: a randomized clinical trial." Urogynecology (Phila). 2025;31(3):234-242. doi:10.1097/SPV.0000000000001617