Skip to main content

Vessel Sealers (da Vinci)

The da Vinci EndoWrist bipolar vessel-sealing and -cutting family — two generations of the same instrument class. Both seal vessels ≤ 7 mm by bipolar electrothermal coaptive desiccation and transect the sealed tissue in a single automated cycle.

VariantReleasedTip profileStatus
Vessel Sealer Extend (EndoWrist One Vessel Sealer)Earlier generationBlunt, broader end tip — well-suited for transection, limited for meticulous dissectionLegacy; still in routine use[1]
SynchroSealJune 2021Fine, tapered tip — adds dissection capabilitySuccessor; preferred for new acquisitions[2]

Headline difference (Pilz da Cunha 2024 propensity-matched, n = 94 each, robotic liver resection): SynchroSeal EBL 48 mL (IQR 10–143) vs VSE 95 mL (IQR 30–200), p = 0.032; other perioperative outcomes equivalent.[2]

Shared Design​

  • 8 mm shaft, full EndoWrist (7 DoF).[3]
  • Bipolar jaws that compress + RF-seal + mechanically transect in a single foot-pedal activation.
  • Bipolar circuit — no return electrode; no stray-energy transfer.[4]
  • Vessel-sealing capacity ≤ ~ 7 mm; veins up to 12 mm sealed in porcine bench data.[5][6]
  • Reposable with limited-use life.

Mechanism​

Bipolar electrothermal coaptive desiccation:[7]

  1. Jaws close with controlled compression — optimal ~ 270 mN/mm² for arteries, 200 mN/mm² for veins.
  2. High-current low-voltage bipolar RF (~ 4 A, low V, < 200 °C) denatures collagen and elastin in the vessel wall.
  3. Coaptation forms the permanent seal.
  4. Integrated cutter transects between the sealed jaws.

Seal quality is determined by the interplay of compression, peak temperature, and current.

Vessel-Seal Capacity — Burst-Pressure Evidence​

Electrothermal bipolar vessel sealers (EBVS) have been extensively validated at supraphysiologic burst pressures:

VesselEBVS mean burst pressureUltrasonic shearsp
4–5 mm artery (Harold 2003)601 mmHg205 mmHg0.0001
6–7 mm artery442 mmHg175 mmHg—
Vein up to 12 mm (Landman 2003 porcine)Supraphysiologic——
Post-op carotid (Berdah 2012 in-vivo)> 500 mmHg through 7 d——

All sealed vessels withstand pressures >> physiologic (> 250 mmHg); Okhunov 2018 contemporary device testing showed no bursting failures for EBVS up to 9 mm.[5][6][8][9]

Reconstructive-Urology and Urogyn Uses​

The vessel-sealer family is the default high-volume sealing instrument for any robotic urogyn / RU case with multiple pedicles to ligate-and-divide:

Robotic urinary diversion / cystectomy​

  • Mesenteric / ileocolic-pedicle division during ileal-conduit / neobladder / Indiana-pouch construction — replaces clip-and-cut with seal-and-cut.
  • Lateral pedicle division at robotic radical cystectomy (Kurpad 2015 setup).[10]

Robotic partial nephrectomy and adrenal surgery​

  • Asali 2026 RCT (n = 112) — robotic vessel sealer vs conventional bipolar grasper in partial nephrectomy: EBL 40 vs 132.5 mL (p = 0.037); similar ischemia / OR time / complications.[11]
  • Hilar segmental-vessel ligation when bulldogs / clips would slow the warm-ischemia clock.
  • Adrenalectomy adrenal-vein and periadrenal-fat division.

Robotic sacrocolpopexy​

  • Broad-ligament and sigmoid-mesentery division when concomitant hysterectomy is performed.
  • Paravaginal-tunnel hemostasis during deep apical dissection.

Robotic hysterectomy and gynecologic-oncology cross-relevance​

  • Hoste / Van Trappen 2015 robotic hysterectomy with VSE for myomatous uteri (n = 50): median EBL 63 mL; learning curve stabilizes at ~ 10 cases (console time 110 → 60 min; total OR 158 → 105 min, both p < 0.05); BMI / uterine weight / size not significant predictors.[12]
  • Bizoń 2025 robotic paraaortic LN dissection for endometrial cancer — vessel-sealer use significantly lower blood loss.[13]

Robotic RP / cystectomy reconstructive components​

  • Lateral prostatic-pedicle division in non-nerve-sparing cases. For NVB-sparing, use cold sharp monopolar curved scissors — energy-dependent seal-and-cut is the wrong tool near the NVB.

Hepatic parenchymal transection (cross-specialty)​

  • Pilz da Cunha 2024 two-center series (n = 155) with SynchroSeal: conversion 0.6%, median EBL 40 mL, LOS 3 d, morbidity 19.4%, severe 11.0%.[2]
  • Birgin 2026 SAMBA (Sealer And Moisture-Based Approach) — saline irrigation + SynchroSeal (n = 55) or VSE (n = 17): median OR 174 min, EBL 200 mL, no post-hepatectomy hemorrhage, no 90-d mortality. Saline minimizes carbonization and enhances visualization.[14]

The SAMBA wet-sealing concept transfers to deep-pelvic urogyn / RU plane work where carbonization-obscured visualization is the limiting factor.

Robotic colectomy / gastrectomy (cross-specialty)​

  • Pappou 2015 robotic colectomy setup — VSE in dominant Arm 1; IMA ligation with vessel sealer proximal to the superior hemorrhoidal artery.[15]
  • Takada 2005 laparoscopic colectomy — EBVS vs ultrasonic shears: less rebleeding, shorter mesocolon dissection time (7.9 vs 18.4 min transverse; 15.0 vs 27.6 min sigmoid).[16]
  • Kong 2017 robotic gastrectomy (VSE n = 17 vs ultrasonic n = 52): comparable OR / EBL / complications; lower CRP on POD 2 (8.06 vs 11.7, p = 0.002) and higher albumin on POD 5 (3.51 vs 3.32, p = 0.019), suggesting reduced tissue inflammation. Kong specifically noted the VSE's blunt non-active tip required ancillary bipolar coagulation for fine dissection — the design rationale behind the SynchroSeal fine-tip redesign.[1]
  • Cochrane (Tou 2011) — EBVS shortens OR time vs monopolar scissors; no difference vs ultrasonic in complications.[4]

RAMIE​

  • Hirahara 2022 — vessel sealer is one of the most powerful hemostatic energy devices for RAMIE; articulating jaws suit sharp transection; VSE produces widespread high-temperature steam during activation; blunt tip limits utility for meticulous dissection near critical structures.[17]

VSE vs SynchroSeal — The Within-Family Choice​

FeatureVessel Sealer ExtendSynchroSeal
TipBlunt, broaderFine, tapered
Activation cycleStandardFaster
Dissection capabilityLimited (blunt tip)Better (finer tip enables precise dissection)
Steam generationWidespread high-temperature steam noted in literatureReduced
Sealing capacity≤ 7 mm≤ 7 mm
ArticulationEndoWrist 7 DoFEndoWrist 7 DoF
Liver-resection EBL (Pilz 2024 matched, n = 94 each)95 mL (IQR 30–200)48 mL (IQR 10–143), p = 0.032
Acquisition recommendationLegacy / replacementPreferred for new acquisitions

Recommendation: For new acquisitions or upgrades, the SynchroSeal is preferred — finer tip, faster cycle, lower EBL in the only direct comparison. The VSE remains a well-validated reliable instrument and is the dominant device in published series for the period 2010–2021.

Vessel Sealers vs Other da Vinci Energy Instruments​

FeatureVessel Sealer familyMaryland bipolarMonopolar scissorsUltrasonic shears
EnergyBipolar RFBipolar RFMonopolar RFUltrasonic 55 kHz
Seal + cut integratedYesNoYes (mechanical cut only)Yes
Vessel-seal capacity≤ 7 mmSmall onlyMinimal≤ 5 mm
Tip profileVSE blunt / SynchroSeal fineVery thinCurved bladesBlade
Dissection precisionLow (VSE) / moderate-high (SynchroSeal)HighestHighModerate
Hemostatic strengthStrongModerateWeakModerate
Thermal spread (1 s, 60 W)2.8–3.9 mm2.2 mm3.5 mm2.9 mm
Thermal-damage depth (Noble 2011 histo)3.37 mm (LigaSure EBVS)——1.95 mm (Harmonic Ace)
Steam generationWidespread (VSE) / reduced (SynchroSeal)MinimalNoneNone
Stray-energy riskNoNoYesNo
Best forVessel sealing + bulk transectionPrecise dissectionPrimary dissectionRapid transection

Safety Profile​

  • No stray energy / no return pad — bipolar advantage over monopolar instruments.[4]
  • Lateral thermal spread in the bipolar range (2.8–3.9 mm at 1 s); much lower than monopolar at 2 s (> 20 mm).[18]
  • Thermal-damage depth EBVS ~ 3.37 mm (histologic) — greater than ultrasonic (1.95 mm); respect a working margin from sensitive structures.[19]
  • Steam thermal injury — VSE widespread; SynchroSeal reduced but not eliminated; maintain plume awareness in confined corridors (pelvis, mediastinum).[17]
  • Vessel-size ceiling at ~ 7 mm — clip / suture-ligate above this; do not rely on the seal alone for renal vein, IVC, iliac trunks.
  • Carbonization on the jaws — SAMBA-style targeted saline irrigation minimizes; clean the jaws between activations if performance degrades.[14]

Practical Pearls​

  • Choose SynchroSeal over VSE when available — finer tip, faster cycle, lower EBL.
  • For nerve-sparing NVB / ureteral wall use cold-sharp monopolar curved scissors instead — energy-dependent seal-and-cut is the wrong tool.
  • For meticulous dissection near small structures the Maryland bipolar remains preferred — even SynchroSeal's tip is broader than Maryland.
  • Wet sealing (SAMBA) — saline irrigation reduces carbonization and improves visualization in dense-tissue / parenchymal transection.[14]
  • Short learning curve — ~ 10 cases (Hoste 2015 hysterectomy series).[12]
  • Cost trade-off — vessel sealers raise disposable cost vs monopolar + bipolar setup; case-mix justification rests on reduced EBL, fewer instrument exchanges, and reduced clip use.[20][21]
  • Instrument-pair convention — vessel sealer in the dominant hand, grasper (ProGrasp / Cadiere / Tip-Up) contralateral, retractor on the fourth arm.

Limitations​

  • Higher disposable cost vs monopolar scissors + bipolar grasper alone.
  • Energy-dependent — no cold-cutting alternative within the instrument.
  • Vessel size ceiling ~ 7 mm.
  • VSE blunt tip limits meticulous dissection (resolved in SynchroSeal).
  • Steam plume awareness required in confined spaces — particularly VSE.
  • Thermal-damage depth ~ 3.4 mm greater than ultrasonic; respect margins from nerves and ureter.

See also: Maryland Bipolar, Fenestrated Bipolar, Force Bipolar, Monopolar Curved Scissors, Monopolar Cautery Hook, ProGrasp.

References​

1. Kong SH, Kim TH, Huh YJ, et al. "A feasibility study and technical tips for the use of an articulating bipolar vessel sealer in da Vinci robot-assisted gastrectomy." J Laparoendosc Adv Surg Tech A. 2017;27(11):1172–9. doi:10.1089/lap.2017.0093

2. Pilz da Cunha G, De Meyere C, D'Hondt M, Swijnenburg RJ. "Robotic liver parenchymal transection using the SynchroSeal." Surg Endosc. 2024;38(9):4947–55. doi:10.1007/s00464-024-11005-4

3. Stafford AT, Walsh RM. "Robotic surgery of the pancreas: the current state of the art." J Surg Oncol. 2015;112(3):289–94. doi:10.1002/jso.23952

4. Tou S, Malik AI, Wexner SD, Nelson RL. "Energy source instruments for laparoscopic colectomy." Cochrane Database Syst Rev. 2011;(5):CD007886. doi:10.1002/14651858.CD007886.pub2

5. Harold KL, Pollinger H, Matthews BD, et al. "Comparison of ultrasonic energy, bipolar thermal energy, and vascular clips for the hemostasis of small-, medium-, and large-sized arteries." Surg Endosc. 2003;17(8):1228–30. doi:10.1007/s00464-002-8833-7

6. 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:10.1097/01.ju.0000045160.87700.32

7. Wallwiener CW, Rajab TK, Zubke W, et al. "Thermal conduction, compression, and electrical current — an evaluation of major parameters of electrosurgical vessel sealing in a porcine in vitro model." J Minim Invasive Gynecol. 2008;15(5):605–10. doi:10.1016/j.jmig.2008.05.003

8. Okhunov Z, Yoon R, Lusch A, et al. "Evaluation and comparison of contemporary energy-based surgical vessel sealing devices." J Endourol. 2018;32(4):329–37. doi:10.1089/end.2017.0596

9. Berdah SV, Hoff C, Poornoroozy PH, Razek P, Van Nieuwenhove Y. "Postoperative efficacy and safety of vessel sealing: an experimental study on carotid arteries of the pig." Surg Endosc. 2012;26(8):2388–93. doi:10.1007/s00464-012-2177-8

10. Kurpad R, Woods M. "Robot-assisted radical cystectomy." J Surg Oncol. 2015;112(7):728–35. doi:10.1002/jso.24009

11. Asali M, Hallak O, Asali G. "Robotic vessel sealer vs robotic bipolar grasper in partial nephrectomy." Cancers. 2026;18(5):802. doi:10.3390/cancers18050802

12. Hoste G, Van Trappen P. "Robotic hysterectomy using the vessel sealer for myomatous uteri: technique and clinical outcome." Eur J Obstet Gynecol Reprod Biol. 2015;194:241–4. doi:10.1016/j.ejogrb.2015.09.030

13. Bizoń M, Olszewski M, Grabowska A, et al. "Use of the vessel sealer in paraaortic lymphadenectomy in the robotic-assisted approach in endometrial cancer." Sci Rep. 2025;15(1):8175. doi:10.1038/s41598-025-93044-y

14. Birgin E, Rahbari NN. "Sealer and Moisture-Based Approach (SAMBA) hepatectomy technique for robotic parenchymal transection." Ann Surg Oncol. 2026. doi:10.1245/s10434-026-19372-z

15. Pappou EP, Weiser MR. "Robotic colonic resection." J Surg Oncol. 2015;112(3):315–20. doi:10.1002/jso.23953

16. Takada M, Ichihara T, Kuroda Y. "Comparative study of electrothermal bipolar vessel sealer and ultrasonic coagulating shears in laparoscopic colectomy." Surg Endosc. 2005;19(2):226–8. doi:10.1007/s00464-004-9072-x

17. Hirahara N, Matsubara T, Hayashi H, Tajima Y. "Features and applications of energy devices for prone robot-assisted minimally invasive esophagectomy: a narrative review." J Thorac Dis. 2022;14(9):3606–12. doi:10.21037/jtd-22-559

18. 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):245–52. doi:10.1111/bju.12498

19. Noble EJ, Smart NJ, Challand C, et al. "Experimental comparison of mesenteric vessel sealing and thermal damage between one bipolar and two ultrasonic shears devices." Br J Surg. 2011;98(6):797–800. doi:10.1002/bjs.7433

20. Hubner M, Demartines N, Muller S, et al. "Prospective randomized study of monopolar scissors, bipolar vessel sealer and ultrasonic shears in laparoscopic colorectal surgery." Br J Surg. 2008;95(9):1098–104. doi:10.1002/bjs.6321

21. Ramirez D, Ganesan V, Nelson RJ, Haber GP. "Reducing costs for robotic radical prostatectomy: three-instrument technique." Urology. 2016;95:213–5. doi:10.1016/j.urology.2016.03.067