Vessel Sealers (da Vinci)
Da Vinci vessel sealers are 8 mm EndoWrist bipolar instruments that seal and divide tissue in one pedal activation. Vessel Sealer Extend (VSE) and SynchroSeal differ in vessel-size limit, tip and cutting mechanism. Confirm the instrument, compatible generator and current instructions before use.[1]
Device Selection
| Feature | Vessel Sealer Extend | SynchroSeal |
|---|---|---|
| Labeled vessel diameter | Up to 7 mm | Up to 5 mm |
| Tissue division | Mechanical cutter after bipolar sealing | Bipolar sealing and RF division using a raised cutting electrode |
| Jaw/dissection profile | Blunt, broader tip; suited to transection, limited for fine dissection[6][16] | Finer, curved jaw; adds dissection capability |
| Supply | Sterile, single use | Sterile, single use |
| Tissue bundles | Must fit within the jaws | Must fit within the jaws |
These limits are manufacturer specifications; successful sealing of larger vessels in animal experiments does not extend them. Neither device is established for tubal sterilization. The instruments and their generators are platform-specific; older EndoWrist One publications should not be assumed to describe every current model.[1][2][3]
Reconstructive Use
A vessel sealer can reduce instrument exchanges when selected, clearly exposed vessels or tissue pedicles require both hemostasis and division. Potential contexts include cystectomy or diversion, concomitant hysterectomy, and selected upper-tract dissection. The operation determines which vessels may be divided; device availability does not justify sacrificing a flap, ureteral or bowel blood supply.
- Identify the intended pedicle and nearby structures before closing the jaws. A tissue bundle that fits may still contain a vessel exceeding that device's diameter limit.
- Use clips, ligatures, stapling or vascular reconstruction when indicated by caliber, vessel quality, operative circumstances or the device instructions. A time advantage during renal ischemia is not a reason to exceed a sealing indication.
- For nerve-sparing and periureteral work, consider cold sharp dissection and selective nonthermal hemostasis. Bipolar current is localized, but the jaws, adjacent tissue and steam can still transmit heat.
- Choose between VSE, SynchroSeal, conventional bipolar forceps and cold instruments by the task, platform and local experience. Evidence does not establish a universal acquisition preference for SynchroSeal.
Described applications
These uses come from case series and operative descriptions, not comparative trials.
- Urinary diversion and cystectomy: dividing mesenteric and ileocolic pedicles during conduit, neobladder or pouch construction, and lateral bladder pedicles, replaces clip-and-cut with seal-and-cut. Check the pedicle for vessels above the device limit.
- Sacrocolpopexy with hysterectomy: dividing broad-ligament and sigmoid-mesentery pedicles. In a retrospective cohort of the first 50 robotic hysterectomies for myomatous uteri using VSE, median blood loss was 63 mL. Console and total operative time fell after the first 10 cases (110 to 60 min and 158 to 105 min).[10]
- Paraaortic lymphadenectomy for endometrial cancer: in 25 patients, vessel-sealer use was associated with lower blood loss than monopolar scissors alone, at higher cost.[11]
- Prostatic pedicles: near the neurovascular bundle, use cold sharp dissection with Monopolar Curved Scissors instead of seal-and-cut.
- Wet sealing: in 72 robotic hepatectomies, Birgin and Rahbari combined a sealer with targeted saline irrigation (SAMBA) to reduce carbonization and improve visualization. The authors describe it as a technique; the same idea may help in dense deep-pelvic planes but has not been tested there.[12]
Burst-pressure and thermal data
These are bench data from laparoscopic electrothermal bipolar sealers (LigaSure), not da Vinci instruments. They show what the technology can do, not what a da Vinci seal will do.
| Study | Model | Finding |
|---|---|---|
| Harold 2003 | Porcine arteries, 16 per size group | Mean burst pressure 601 vs 205 mmHg (4-5 mm) and 442 vs 175 mmHg (6-7 mm) against ultrasonic shears; only 128 mmHg at 2-3 mm. Thermal spread did not differ (2.57 vs 2.18 mm).[8] |
| Okhunov 2018 | 246 porcine vessels, five devices | LigaSure had no burst failures up to 9 mm. Every recorded burst pressure exceeded 250 mmHg, but Harmonic Ace and Enseal had burst failures in medium and large arteries.[9] |
| Noble 2011 | Ex vivo human mesenteric vessels, mean diameter about 1 mm | Thermal damage depth 3.37 mm with LigaSure vs 1.95 mm with Harmonic Ace. Burst pressures did not differ.[15] |
What the Comparative Evidence Shows
| Study | Design and population | Finding and practical limit |
|---|---|---|
| Pilz da Cunha 2024 | Post hoc comparison of prospectively collected robotic liver-resection cohorts; 155 SynchroSeal and 145 VSE patients, with 94 matched pairs | Median blood loss 48 (IQR 10-143) vs 95 mL (IQR 30-200), p = 0.032, in the matched comparison; other perioperative outcomes were similar. This is an association in liver surgery, subject to residual confounding; it does not establish pelvic-surgery superiority. The June 2021 date describes implementation at the study centers, not necessarily product launch.[4] |
| Asali 2026 | Retrospective, 112 partial nephrectomies: 54 vessel sealer versus 58 conventional bipolar grasper | Mean blood loss 40 vs 132.5 mL (p = 0.037); ischemia time and complications were similar. No randomized allocation; nonsignificant differences in other outcomes do not establish equivalence.[5] |
| Kong 2017 | Prospective feasibility experience in 17 robotic gastrectomies, compared with 52 contemporary ultrasonic cases; not randomized | Demonstrated feasibility of an articulating EndoWrist One sealer. Inflammatory laboratory differences and handling observations do not prove better urologic recovery or identify the best current product.[6] |
In laparoscopic colectomy, a 30-patient comparison found less rebleeding and faster mesocolic dissection with a bipolar sealer than with ultrasonic shears.[13] The Cochrane review of six randomized trials (446 participants) found shorter operative time with bipolar sealers than monopolar scissors and no clear difference from ultrasonic shears, but the trials were small and heterogeneous.[14] A narrative review of robotic esophagectomy describes the VSE as a powerful hemostatic device that produces widespread high-temperature steam and suits transection better than fine dissection. It describes SynchroSeal as faster to activate, with a finely divided tip.[16]
Small cross-specialty series are useful for feasibility and handling ideas, but are insufficient to prescribe routine pelvic use or infer lower complications. Experimental seal burst pressures likewise describe the tested device, vessel and conditions, not a guarantee for every clinical seal.
Energy Safety
Bipolar sealing generally avoids a separate patient return pad. That does not mean there is no patient current or no thermal injury risk. Heat spreads beyond the tissue compressed in the jaws; steam and recently activated surfaces can injure adjacent structures. Hefermehl's bovine-tissue study of laparoscopic-type robotic instruments found critical (45 °C) lateral spread at 60 W and 1 s of 3.5 mm for monopolar, 2.2 mm for adjustable bipolar, 2.8 mm for LigaSure, 3.9 mm for PK forceps and 2.9 mm for ultrasonic. Monopolar spread exceeded 20 mm at 2 s. A Maryland clamp used as a heat sink reduced spread. These are not da Vinci sealer measurements, and there is no validated clearance for nerves, bowel or ureter.[7]
Follow the model-specific instructions for tissue capture, activation feedback, an incomplete seal, jaw cleaning and cooling. Keep the entire working end visible during activation and avoid incorporating clips or other unintended material. Do not infer a fixed safe cooling interval or transfer a saline-assisted liver-transection technique into pelvic surgery without device compatibility and procedure-specific justification.
Practical Points
- Use Maryland Bipolar for meticulous dissection near small structures. Even the finer SynchroSeal tip is broader.
- Clean carbonized jaws between activations if sealing performance drops.
- Vessel sealers raise disposable cost. The case for them rests on fewer instrument exchanges and less clip use, which has not been shown to improve outcomes in reconstructive cases.
- A common arm arrangement puts the sealer in the dominant hand, a grasper (ProGrasp, Cadiere or Tip-Up Fenestrated) in the contralateral hand and a retractor on the fourth arm.
See also: Energy Devices, Maryland Bipolar, Fenestrated Bipolar, Force Bipolar, Monopolar Curved Scissors, Harmonic ACE.
References
1. Intuitive. Da Vinci SynchroSeal: product information and intended use for SynchroSeal and Vessel Sealer Extend. Manufacturer specifications. Accessed September 2026.
2. Intuitive. Vessel Sealer Extend data sheet: single-use instrument specification. Manufacturer data sheet.
3. Intuitive. SynchroSeal data sheet: single-use instrument specification. Manufacturer data sheet.
4. Pilz da Cunha G, De Meyere C, D'Hondt M, Swijnenburg RJ. Robotic liver parenchymal transection using the SynchroSeal. Surg Endosc. 2024. doi:10.1007/s00464-024-11005-4.
5. Asali M, Hallak O, Asali G. Robotic vessel sealer vs robotic bipolar grasper in partial nephrectomy. Cancers. 2026;18:802. doi:10.3390/cancers18050802.
6. 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;27:1172–1179. doi:10.1089/lap.2017.0093.
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;114:245–252. doi:10.1111/bju.12498.
8. 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
9. 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
10. 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
11. 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
12. Birgin E, Rahbari NN. "Sealer and Moisture-Based Approach (SAMBA) hepatectomy technique for robotic parenchymal transection." Ann Surg Oncol. 2026;33(6):5829–32. doi:10.1245/s10434-026-19372-z
13. 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
14. 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
15. 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
16. 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