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Masterson Pedicle Clamp

Straight, heavy, long-jawed ratcheted pedicle clamp with longitudinal serrations — the abdominal-hysterectomy counterpart to the Heaney clamp. Where the Heaney's curved jaw is engineered for the vaginal approach, the Masterson's straight jaw is engineered for the abdominal approach where the surgeon works from above with direct visualization and can place the clamp perpendicular to the pedicle axis.[1][2]

Named after John G. Masterson, an American gynecologic surgeon.

Design​

  • Jaws: straight (or only slightly curved) with longitudinal serrations running parallel to the jaw length — the serration pattern that distinguishes Masterson from cross-hatched / transverse-serrated clamps.
  • Jaw length: relatively long (~ 35–50 mm) — accommodates broad tissue pedicles in a single bite.
  • Ring handles with a ratcheted box lock.
  • Length: typically 21–24 cm (8.25–9.5 in) — adequate reach for deep pelvic dissection through an abdominal incision.
  • Material: surgical-grade stainless steel.
  • Heavy construction for the thick vascular pedicles of hysterectomy.

Why the Straight Jaw + Longitudinal Serrations​

The two design choices are matched to the abdominal-hysterectomy approach:

  • Straight jaw: with the surgeon working from above with direct line of sight, the clamp can be placed perpendicular to the pedicle axis at the intended transection point — producing a clean linear crush line that facilitates precise suture-ligature placement beneath the clamp.
  • Longitudinal serrations: distribute clamping pressure evenly along the jaw length rather than concentrating force at transverse ridges. This reduces tissue tearing or slippage of broad pedicles (cardinal ligament, uterine-artery complex) and lets the ligature seat cleanly into the crush groove.

The Heaney's curved jaw and cross-hatched / tooth pattern serve the opposite anatomic geometry — vaginal approach, deep narrow field, need to follow the uterine curvature.

Reconstructive-Urology and Urogyn Uses​

Total abdominal hysterectomy (TAH) — the signature application​

Sequential pedicle clamping during open abdominal hysterectomy:[1][2]

  1. Round ligament — clamped, divided, ligated to enter the broad ligament.
  2. Infundibulopelvic ligament (if salpingo-oophorectomy) or utero-ovarian / fallopian-tube pedicle (if ovarian preservation).
  3. Uterine artery pedicle — the critical step. Masterson placed perpendicular to the uterine axis at the level of the internal os, skeletonizing the uterine vessels while maintaining a safe distance from the ureter (which crosses ~ 1.5–2 cm lateral to the cervix at this level — the "water under the bridge" relationship).[3][8]
  4. Cardinal and uterosacral pedicles — sequentially as dissection proceeds inferiorly toward the vaginal fornices.
  5. Vaginal cuff — final pedicle before specimen removal.

Adjunctive abdominal hysterectomy during reconstruction​

  • Abdominal sacrocolpopexy with concomitant TAH — Masterson used for the uterine and cardinal pedicles when the abdominal approach is chosen for the hysterectomy step.
  • Complex pelvic fistula repair requiring abdominal-approach hysterectomy.
  • Pelvic-floor reconstruction with concomitant abdominal hysterectomy.

Radical hysterectomy (Wertheim / modified)​

For cervical-cancer radical hysterectomy — typically performed by gyn-oncology rather than RU/urogyn, but mentioned because energy-based vessel sealers are progressively replacing clamp-and-tie in this setting.[4][5]

Peripartum / cesarean hysterectomy​

Emergency pedicle control during cesarean hysterectomy for postpartum hemorrhage; pregnancy-related vascular engorgement and tissue edema make clamping more challenging.[6]

Other open pelvic operations​

Any abdominal procedure requiring clamping of broad vascular tissue pedicles — large oncologic resections, complex re-do pelvic operations.

Clamp-Cut-Tie Technique with the Masterson​

  1. Placement: clamp applied across the pedicle perpendicular to the tissue, tip positioned at the intended transection point. A second clamp (or finger counter-traction) on the specimen side stabilizes the pedicle.
  2. Cutting: tissue divided on the uterine / specimen side of the clamp with Mayo scissors or scalpel.
  3. Ligation: 0 or 2-0 absorbable suture (Vicryl / Maxon / PDS) placed beneath the clamp; tied as the clamp is slowly released so the ligature seats into the crush groove.
  4. Transfixion suture for vascular pedicles (especially the uterine artery): stick-tie through the pedicle followed by a free tie — prevents slippage from the cut end.

Masterson vs Heaney vs Adjacent Pedicle Clamps​

ClampJaw shapeSerrationsBest approach
MastersonStraight (or slightly curved)LongitudinalAbdominal — perpendicular pedicle placement
Heaney (single curve)Single curveCross-hatched / toothedVaginal — conforms to uterine curvature
Heaney-BallentineDouble curveCross-hatched / toothedVaginal — deep pelvic apex
ZeppelinCurved, right-angleSerratedVaginal — angled access
KocherStraight or curvedFull transverse + 1×2 tip toothFascia and discarded tissue; the high-trauma-end clamp
Rochester-PéanCurvedFull transverseLong heavy pedicle clamp at depth

The straight-vs-curved choice follows the approach: abdominal = Masterson; vaginal = Heaney. Most teams keep both on the open hysterectomy tray and switch when the approach is converted.

Energy Devices vs Clamp-and-Tie​

Bipolar vessel sealers and ultrasonic shears are increasingly replacing clamp-and-tie in abdominal hysterectomy. Tamussino 2005 and Li 2012 demonstrated reduced blood loss and operating time with bipolar sealers in radical abdominal hysterectomy; De Leo 1999 RCT data and the Pickett 2023 Cochrane review on hysterectomy approaches support the trend.[4][5][7][8][9] The Masterson remains essential for:

  • Resource-limited settings without advanced energy devices.
  • Backup hemostasis when energy devices fail or are unavailable.
  • Emergency peripartum hysterectomy where clamp-and-tie is the fastest reliable option.[6]
  • Resident training — clamp-cut-tie remains a foundational skill before energy devices are introduced.

Limitations​

  • Not for the vaginal approach — straight jaw cannot conform to the uterine curvature from below; use the curved Heaney instead.
  • Crushing tissue trauma — acceptable on the specimen side; not for tissue intended to remain in situ.
  • Ureteral risk at the uterine-artery clamp — the ureter passes ~ 1.5–2 cm lateral to the cervix at the level of the uterine artery; clamp placement that strays laterally risks ureteral injury.[3][8]
  • Declining absolute use with the broader shift toward minimally invasive hysterectomy (vaginal, laparoscopic, robotic).[9]

Current Status​

Abdominal hysterectomy remains the fallback approach for large uteri, extensive adhesive disease, and gynecologic malignancy when minimally invasive approaches are infeasible.[9] When the abdominal approach is selected, the Masterson is the canonical pedicle clamp. The instrument continues to be taught in OB-GYN residency programs and remains on every abdominal-hysterectomy tray, even where energy devices have become the primary hemostatic tool.

See also: Heaney Clamp, Rochester-Péan, Kocher Clamp, Mayo Scissors.

References​

1. Baggish MS. "Total and subtotal abdominal hysterectomy." Best Pract Res Clin Obstet Gynaecol. 2005;19(3):333–56. doi:10.1016/j.bpobgyn.2004.12.002

2. Miyazawa K. "Technique for total abdominal hysterectomy: historical and clinical perspective." Obstet Gynecol Surv. 1992;47(7):433–47. doi:10.1097/00006254-199207000-00001

3. Samaan A, Vu D, Haylen BT, Tse K. "Cardinal ligament surgical anatomy: cardinal points at hysterectomy." Int Urogynecol J. 2014;25(2):189–95. doi:10.1007/s00192-013-2248-y

4. Tamussino K, Afschar P, Reuss J, et al. "Electrosurgical bipolar vessel sealing for radical abdominal hysterectomy." Gynecol Oncol. 2005;96(2):320–2. doi:10.1016/j.ygyno.2004.09.021

5. Li L, Qie MR, Wang XL, et al. "BiClamp forceps was significantly superior to conventional suture ligation in radical abdominal hysterectomy: a retrospective cohort study in 391 cases." Arch Gynecol Obstet. 2012;286(2):457–63. doi:10.1007/s00404-012-2275-9

6. Tsolakidis D, Zouzoulas D, Pados G. "Pregnancy-related hysterectomy for peripartum hemorrhage: a literature narrative review of the diagnosis, management, and techniques." Biomed Res Int. 2021;2021:9958073. doi:10.1155/2021/9958073

7. Hefni MA, Bhaumik J, El-Toukhy T, et al. "Safety and efficacy of using the LigaSure vessel sealing system for securing the pedicles in vaginal hysterectomy: randomised controlled trial." BJOG. 2005;112(3):329–33. doi:10.1111/j.1471-0528.2004.00325.x

8. De Leo V, De Palma P, Ditto A, et al. "Total abdominal hysterectomy: a randomized study comparing two techniques." Eur J Obstet Gynecol Reprod Biol. 1999;85(2):141–5. doi:10.1016/s0301-2115(99)00025-1

9. Pickett CM, Seeratan DD, Mol BWJ, et al. "Surgical approach to hysterectomy for benign gynaecological disease." Cochrane Database Syst Rev. 2023;8:CD003677. doi:10.1002/14651858.CD003677.pub6