Himplant / Penuma — Subcutaneous Silicone Sleeve
Penuma and Himplant name a family of preformed silicone sleeves placed around the penile shaft, outside the corpora cavernosa. Their cosmetic role differs from intracorporal prostheses used to provide erectile rigidity. Device generations and operative approaches have changed; an older series does not establish outcomes for every current configuration.[1]
For the operative evidence and complications, see Penuma & Himplant.
Material and Regulatory Context
The May 2022 FDA 510(k) clearance describes a preformed medical-grade silicone block with embedded polyester mesh, in L, XL and XXL sizes. Its augmentation indication is aesthetic. That substantial-equivalence clearance is distinct from a demonstration of long-term benefit or a clearance to treat erectile dysfunction. Verify the exact contemporary product rather than assuming that every Himplant has the same size matrix or mesh exposure as the cleared historical model.[2]
A solid silicone sleeve is also different from free liquid-silicone injection. A ventral opening or placement external to the tunica does not guarantee preservation of urethral, skin, sensory or erectile function.[1]
SMSNA Position and Counseling
The 2024 SMSNA position statement recommends silicone-sleeve implantation only under IRB oversight with long-term safety endpoints and no cost to the patient, by experienced surgeons after discussion of potentially severe complications. This is an expert-consensus recommendation reflecting limited and potentially biased evidence.[1]
Infection, erosion, extrusion, migration, distal flaring, deformity and dissatisfaction may lead to revision or removal. Published referral series document persistent shortening, curvature, sensory symptoms and erectile dysfunction after explantation. These selected complication series cannot estimate the overall event rate, but they refute a promise that removal reliably restores the preoperative appearance or function.[1]
Removal and Subsequent Reconstruction
Surgical removal is possible; complete reversibility is not assured. Scarring, tissue adherence, infection and skin compromise determine the operative plan and whether staged management is required. Rehabilitation protocols should not be presented as guarantees of restored length or function. The same distinction between explantation and full reversibility also applies to corporal penile prostheses.[1]
See Inflatable Penile Prosthesis, Penile Pearls and the Cosmetic Genital Surgery atlas.
References
1. Sexual Medicine Society of North America. Cosmetic penile enhancement procedures: an SMSNA position statement. J Sex Med. 2024;21:573–581. doi:10.1093/jsxmed/qdae045.
2. FDA. Pre-Formed Penile Silicone Block, K220760. May 13, 2022. Clearance, indications and device summary.