Probe & Grooved Director

Two classical malleable hand instruments used in pair for exploring narrow tracts and guiding a controlled incision along their length. In reconstructive urology and urogyn the workhorse application is fistula-tract delineation and protection during fistulotomy / fistulectomy: VVF, urethrovaginal fistula, rectovaginal fistula, urethroperineal fistula, urethral diverticulum, and post-radiation sinus tracts.

The Two Instruments

Instrument	Form	Role
Surgical probe (Bowman / lacrimal / fistula probe)	Slender malleable metal rod, bulbed atraumatic tip at one or both ends; available in graduated sizes (00–8)	Exploration — passed gently along a tract to map length, direction, branching, and depth
Grooved director	Flat malleable metal blade with a longitudinal groove along its working surface; bulbed atraumatic distal tip; flared proximal handle	Incision guidance + tissue protection — the probe is exchanged for the director, the surgeon passes a scalpel or scissors blade along the groove to divide overlying tissue while the director protects underlying structures

Both instruments are stainless steel, autoclavable, malleable so they conform to a tortuous tract.

Reconstructive-Urology and Urogyn Uses

Fistula and sinus-tract surgery

• Vesicovaginal / urethrovaginal / rectovaginal fistula — probe defines the tract from one orifice to the other; director then guides controlled circumferential excision or laying-open of the tract.
• Urethroperineal / urethrocutaneous fistula after hypospadias, urethroplasty, or radiation — probe maps the depth and director protects the corpus spongiosum / urethral plate during dissection.
• Anal / perianal fistula at the time of combined urogyn-colorectal repair — Goodsall-rule probing followed by director-guided fistulotomy.
• Post-radiation perineal sinus tract — atraumatic exploration of a friable tract before debridement.

Urethral and periurethral surgery

• Urethral diverticulum dissection — fine probe defines the diverticular neck and circumference; director protects the urethral lumen during diverticulectomy.
• Skene's-gland abscess marsupialization — probe defines the duct; director guides ductotomy.
• Bartholin-cyst marsupialization — same pattern.

Pediatric and reconstructive pediatric urology

• Hypospadias fistula closure — fine probe (00 / 0) defines the tract through the neourethra; director may be inappropriate for the small caliber and a fine right-angle clamp (Gemini) often substitutes.
• Patent urachus / urachal sinus — probe explores the residual lumen.

General use

• Defining a chronic sinus / abscess tract before debridement.
• Threading a seton through an anal fistula.
• Calibrating a tight orifice (urethra, ureter, stoma) — though dedicated dilators (Hegar, Van Buren) are preferred.

Technique — Probe-Then-Director

1. Identify both ends of the tract (eg, fistulous opening into the vagina and into the bladder for VVF).
2. Pass the bulbed probe gently along the path; never force. The probe will follow the path of least resistance — if it deviates, suspect branching or a false passage.
3. Confirm transluminal position with the contralateral palpating finger, with cystoscopy / endoscopy, or with a malleable probe passed from the opposite orifice that meets the first probe.
4. Exchange probe for director, keeping the director in the tract.
5. Lay scalpel or scissors blade in the groove and divide overlying tissue along the director's length — the bulbed tip protects the deep end; the groove confines the blade to the planned incision line.
6. After incision, the director is removed and the tract is excised or laid open as planned.

Safety Pearls

• Never force the probe — a stiff malleable instrument can create a false passage in a friable / radiation-bed / inflammatory tract; if resistance is met, withdraw and re-probe from the opposite end.
• Match probe caliber to tract caliber — use the smallest probe that follows the lumen.
• Confirm path before incision — palpation, endoscopic visualization, or two-probe meet-up; an unverified probe trajectory is the commonest cause of off-axis fistulotomy.
• In radiation beds / friable tissue consider abandoning probe-and-director in favor of stepwise sharp dissection with a Gemini or Mixter right-angle.
• Hemostasis — both instruments are mechanical only; pair with a bipolar for tract-wall bleeding.

Limitations

• Cannot navigate completely obliterated tracts — the probe needs a lumen to follow.
• No magnification or visualization — supplement with cystoscopy / endoscopy where the tract crosses a hollow viscus.
• Stiff malleable shaft can create a false passage in friable tissue.
• Not for the obstructed urethra — use filiform and followers instead.

See also: Hegar Dilators, Filiforms & Followers, Open-Ended Ureteral Catheters, Mixter Right-Angle Clamp, Gemini Fine Right Angle, Crawford Stripper.