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Cavernotomes

Cavernotomes are specialized cutting-dilators that carve a channel through fibrotic corporal tissue during penile prosthesis implantation when standard blunt dilation fails. They are among the most-used tools in the prosthetic urologist's armamentarium for corporal fibrosis — employed in roughly 60% of fibrosis cases at tertiary referral centers.[1][2][3][4] Unlike the urethral sounds and bougies in this section, cavernotomes dilate the corpus cavernosum, not the urethra; they are grouped here as cutting-dilation instruments alongside the Otis urethrotome.

When They Are Needed​

Cavernotomes are reached for when the corpus is too scarred to admit a cylinder by blunt dilation. The fibrosis most often follows:

  • Prior prosthesis explant — for infection (~40%) or erosion (~17%)[4]
  • Ischemic priapism (~33%), especially prolonged episodes or those treated with distal shunts[4][5]
  • Other risk factors — prior radiation, cardiovascular/peripheral vascular disease, older age[6]

The full intraoperative escalation ladder (VED prehab → Hegar dilation → cavernotomes → counter incisions → corporeal excavation → grafting) is laid out on the penile-prosthesis revision-scenarios page.

Designs​

Carrión-Rossello cavernotomes (first generation)​

The original specialized corporal-excavation instruments, a historical milestone in prosthetic surgery. They were developed in the lineage of Hernán Carrión — co-developer of the landmark Small-Carrión malleable prosthesis (1975) and a foundational figure in penile prosthetics.[7] They are listed alongside the Otis urethrotome as early instruments for excavating fibrotic corpora, sharing the defining limitation of all cavernotomes: they work beneath the tunica albuginea, out of direct sight.[8]

Two drawbacks drove the development of the successor design: they required more extensive corporeal resection and longer operative times than the controlled-cut Mooreville-Wilson instruments.[1] The original publication predates indexed databases, so granular specifications and series data are not well captured in the searchable literature; in contemporary practice the generic term "cavernotomes" usually refers to the Mooreville-Wilson design.[3][9]

Mooreville-Wilson cavernotomes (Uramix) — the modern workhorse​

Introduced in 1999 by Mooreville, Adrian, Delk, and Steven K. Wilson, this is the most widely used cavernotome set and is distributed commercially as the Uramix cavernotomes. "Mooreville-Wilson cavernotomes," "Mooreville Uramix cavernotomes," and "cutting cavernotomes" are used interchangeably in the literature.[1][3]

FeatureSpecification
Set5 graduated instruments
Diameters6–13 mm
Cut depthcontrolled 1 mm cuts per pass — incremental, not bulk resection
Advancementoscillating / rotational drilling, never forceful pushing
Extra functioncan shave severely stenotic areas to develop a cavity
Cutting-edge orientationalways lateral, away from the urethra

The 1 mm controlled cut is the key advance: it carves a channel without extensive resection and, in the original series, without any grafting to close the corporotomy — both of which the Carrión-Rossello era often required.[1]

Technique​

  1. High transverse scrotal incision for access (the approach used across the original series).[1]
  2. Try blunt dilators first — Hegar dilators and/or Dilamezinsert; escalate to cavernotomes only when significant resistance is met.[5]
  3. Sequential upsizing — begin with the smallest (6 mm) and advance incrementally to larger diameters.[1]
  4. Oscillating advancement — rotate the instrument back and forth as it advances; controlled tissue removal, not a forceful thrust.[1]
  5. Keep the cutting edge lateral, away from the urethra, throughout — the cardinal safety rule.[5]
  6. Dilate distally and proximally from the corporotomy. In the Clavijo instructional video, dilation reached 11 Fr distally and 13 Fr proximally.[5]

Where no developable plane exists, the Wilson backward-cutting scissors are used first to carve the initial channel so a cavernotome can be seated.

Outcomes​

In the original Mooreville-Wilson series (n = 16): 100% successful three-piece implantation, with 14/16 (87.5%) receiving downsized cylinders, 100% prosthesis survival at publication, no urethral lacerations, and no grafting required.[1]

In the largest multicenter series (Krughoff, n = 42): cavernotomes were used in 25/42 (59.5%) (one more needing limited sharp excision alongside), narrow cylinders in 23.8%, with a major complication rate of only 2.4% (one explant for infection/erosion). Sharp corporal excision beyond cavernotome use was rarely needed.[4]

Complications and Limitations​

The defining limitation is blind instrumentation beneath the tunica albuginea.[8] In the original series this produced:

  • Proximal crural perforation — 5/16 (31%), managed by suturing the rear-tip extender to the tunica with nonabsorbable suture[1]
  • Distal tunical perforation — 4/16 (25%), repaired with native tissue[1]
  • No urethral lacerations occurred, but the risk is intrinsic to the technique[1]

Direct-Vision Adjuncts and Alternatives​

Several techniques address the "out of sight" problem or substitute for cavernotomes entirely:

  • Ultrasound-guided cavernotomy (Shaeer 2007) — real-time sonography keeps the instrument in the mid-corpus, away from the tunica and urethra; reported operative time 50–60 min with no complications.[8]
  • Corporoscopic excavation (Shaeer's technique) — optical urethrotomy plus transurethral resection instruments perform force-free, directly visualized excavation of scar through a ~1.5 cm tunical incision.[10]
  • Corporeal excavation (Montague-Angermeier) — extended ventral corporotomies via an inverted-T penoscrotal incision develop a plane between scar and inner tunica for core removal of nearly all fibrotic tissue; successful in all 9 patients in the original series without grafting.[11]
  • Downsized / narrow-base cylinders — narrow-diameter devices (e.g., Coloplast Titan Narrow Base) are used in ~24% of fibrosis cases when dilation is suboptimal.[4][5]

Tissue-Sparing Consideration​

Aggressive coring is not always the right answer. A meta-analysis of 4 randomized studies (193 patients) found that cavernous tissue-sparing dilation — preserving the cavernosal artery and residual erectile tissue rather than maximally dilating — gave significantly higher cavernosal-artery preservation, residual tumescence in 87–89% vs 7–15%, and greater girth gains (+0.55–1.81 cm), without increasing complications.[12] The implication: the dilation strategy, including how aggressively cavernotomes are used, should be tailored to the severity of fibrosis rather than applied uniformly.

Place in Practice​

No validated algorithm for corporal fibrosis exists, given limited comparative data; the choice among standard dilators, cavernotomes, corporeal excavation, and endoscopic approaches turns on surgeon experience and the corpus encountered.[3] The weight of evidence is reassuring: most patients can be implanted with standard dilators or cavernotomes alone, with sharp excision and grafting rarely required.[4] Complex cases belong with high-volume implanters.[6][13]

See also: Wilson Backward-Cutting Scissors, Hegar Dilators, Otis Urethrotome, Penile prosthesis revision scenarios — corporal fibrosis.

Videos​

Macroporous Polypropylene Mesh Augmentation for Tunica Defects in IPP Revision
VJSM (Video Journal of Sexual Medicine, ISSM) · L. Karapanos, ~8 min. Operative salvage for an accidental tunical perforation during dilation of a severely fibrotic corpus in inflatable penile prosthesis revision — the exact complication this instrument can cause. Hosted on the ISSM Vimeo channel; embed restricted to the publisher's domain, so opens externally.
vjsm.info · Video Journal of Sexual Medicine

References​

1. Mooreville M, Adrian S, Delk JR, Wilson SK. "Implantation of inflatable penile prosthesis in patients with severe corporeal fibrosis: introduction of a new penile cavernotome." J Urol. 1999;162(6):2054–7. doi:10.1016/S0022-5347(05)68099-8

2. Martínez-Salamanca JI, Mueller A, Moncada I, Carballido J, Mulhall JP. "Penile prosthesis surgery in patients with corporal fibrosis: a state of the art review." J Sex Med. 2011;8(7):1880–9. doi:10.1111/j.1743-6109.2011.02281.x

3. Trost L, Patil M, Kramer A. "Critical appraisal and review of management strategies for severe fibrosis during penile implant surgery." J Sex Med. 2015;12(Suppl 7):439–47. doi:10.1111/jsm.12985

4. Krughoff K, Bearelly P, Apoj M, et al. "Multicenter surgical outcomes of penile prosthesis placement in patients with corporal fibrosis and review of the literature." Int J Impot Res. 2022;34(1):86–92. doi:10.1038/s41443-020-00373-9

5. Clavijo RI, Sávio LF, Prakash NS, et al. "Three-piece penile prosthesis implantation in refractory ischemic priapism — tips and tricks." Urology. 2017;106:233–235. doi:10.1016/j.urology.2017.04.032

6. Chang C, Barham DW, Dalimov Z, et al. "New findings regarding predictors of poor corporal integrity in penile implant recipients: a multicenter international investigation." BJU Int. 2025;135(3):528–534. doi:10.1111/bju.16607

7. Martinez DR, Terlecki R, Brant WO. "The evolution and utility of the Small-Carrion prosthesis, its impact, and progression to the modern-day malleable penile prosthesis." J Sex Med. 2015;12(Suppl 7):423–30. doi:10.1111/jsm.13014

8. Shaeer O. "Penile prosthesis implantation in cases of fibrosis: ultrasound-guided cavernotomy and sheathed trochar excavation." J Sex Med. 2007;4(3):809–814. doi:10.1111/j.1743-6109.2007.00467.x

9. Wilson SK, Delk JR. "Historical advances in penile prostheses." Int J Impot Res. 2000;12(Suppl 4):S101–7. doi:10.1038/sj.ijir.3900586

10. Shaeer O, Shaeer A. "Corporoscopic excavation of the fibrosed corpora cavernosa for penile prosthesis implantation: optical corporotomy and trans-corporeal resection, Shaeer's technique." J Sex Med. 2007;4(1):218–225. doi:10.1111/j.1743-6109.2006.00348.x

11. Montague DK, Angermeier KW. "Corporeal excavation: new technique for penile prosthesis implantation in men with severe corporeal fibrosis." Urology. 2006;67(5):1072–5. doi:10.1016/j.urology.2005.11.001

12. Mohamed H, Abdelshafi A, Ahmed A, et al. "Impact of cavernous tissue-sparing techniques on postoperative outcomes in penile prosthesis surgery: a systematic review and meta-analysis." J Sex Med. 2026;23(2):qdag006. doi:10.1093/jsxmed/qdag006

13. Schifano N, Capogrosso P, Cakir OO, Dehò F, Garaffa G. "Surgical tips in difficult penile prosthetic surgery: a narrative review." Int J Impot Res. 2023;35(8):690–698. doi:10.1038/s41443-022-00629-6