The first of the modern semirigid prostheses was the Small-Carrion, named for the two doctors who developed it. It’s been around since 1973 and is still being used by some physicians.

Now, other variations on the same theme have been introduced. The newer models—the Flexirod, invented by Dr. Roy Finney, the Jonas Silicone-Silver prosthesis, named for its developer Dr. Udo Jonas, and the AMS 600—were designed to make the implant more concealable and bendable when not in the erect position.

The Small-Carrion prosthesis is bendable and allows the penis to be moved up, down or to the side. It has no portion specifically designed to bend, however. It is uniformly stiff throughout.

Unlike the Small-Carrion implant, the Flexirod was specifically designed to bend at the base of the penis to be more easily concealed. And the Flexirod is slightly stiffer along the shaft.

Yet another variation of the semirigid implant has a kind of memory: When you bend it, it will stay where you put it, and not snap back. Both the Jonas and the AMS 600 prostheses have this characteristic, made possible by their twisted wire core covered by silicone rubber. The advantage of these models is that once the penis is bent down, it will stay that way, so the penis won’t always look erect. The one drawback to this type is that rarely, a wire may break, and although the wire is still covered by the silicone rubber, the penis then becomes more floppy at the base.

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