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[alexsan]

Can an implant correct any narrowing,curvature and erectile dysfunction due to venous leak or any other thing like arterial blockage?

[GaussRifle]

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Yes. An implant like the titan by coloplast is very good to correct narrowing and curvature, and it will straighten out most penises without additional surgery. Any implant will cure ED no matter what the reason... due to artery or venous leak, it doesn't matter.
Most important thing is to find a world class surgeon doing many implants per year.