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I understand all of the components involved in the implants and the ways in which they can be put into the body, but the one thing i cant get my brain around is : what makes the entire structure stable? If I put 2 inches of a ball point pen into a block of styrofoam, and then a human female sits on it: the pen will remain intact.... but will pivot at the point it is inserted into the styrofoam. Are the rigid ends of the implants intentionally lodged in between some bones or cartilage? One of my issues is that my penis pivots at the base, so even with trimix, i mostly lay on my side with my partner and "stuff it" in. The experience with this "instability" is what provokes my question.

The cylinders, 2, are put INSIDE the erectile chambers, 2, one one each side of your penis. These chambers are cut open toward the base of the penis, and a measurement is taken from the opening down to the pelvic bone, sorry, I don't know the medical name, and then a second measurement from the opening up to the glans, these too measurements are added together and that total determines the length of the implanted cylinders, in my case, 20cm. The cylinders are then inserted INTO the chambers, with the tubes exiting through this incision, and it is sown up with dissolving sutures. So now instead of the chambers filling with blood as with a normal erection, they are filled with saline which is pumped in from the pump in the scrotum.
Coloplast and AMS have some good of the whole operation on a real person, just Google it.
Andy

Thanks Andy. But my question is: what is the base anchored to to keep the whole thing from wobbling and pivoting? Unless its riveted to the pelvic bone. is that third of the implant which goes into the body secured to anything?

Imagine a car lodged lengthwise between two trees. You can’t drive it forward, you can’t back it up, and you can’t turn it. It just stays where it was put. Same with an implant.

Thanks Greg. So what are the trees? Are there bones or cartilage that the base is wedged into? It can't just be flesh. (can it?)

Excellent question. From what I can tell the cylinders are jammed in right alongside the already anchored plumbing and the body accepts and heals over it's new resident. I'm going to my uro this week . I'll ask him.

You may be unfamiliar with the part of the penis that is not exposed. There is a good portion that extends into the body too. I believe it is referred to as the cruse much of the implant cylinders occupy this space. Here lies the anchor for the whole unit.

The proper name is spelled" crus." Look up crus of penis. Look at the illustrations. Look at crus of penis-wikipedia. The crus , there are 2. one at the base of each implant. The crus are anchored in muscle on each side inside your thigh right at your perineum floor. The crus muscles are what your penis drives against, ( not your pubic bone) or your prostate. Look up the illustrations. A picture is worth a thousand words especially here. The implants or RTEs are anchored into the crus.

Good questin. As mentioned on the prior responses, the penis is attached to your pelvis bone through the cartilage and fibers of the crus. In a very rough manner, this is simulated by the picture below:




The photo comes from a scientific presentation on rigidity and rear tip extenders. The presentation was in scottsdale, and the publication is listed below:

Rear Tip Extenders and Penile Prosthesis Rigidity: A Laboratory Study of Coloplast Prostheses

Billy H. Cordon, MD
,
Martin S. Gross, MD
,
Jeffrey Taylor, BS
,
Jean-Francois Eid, MD


Abstract
Background
Rear tip extenders (RTEs) are used commonly in penile prostheses, but their effect on erectile rigidity has not been extensively studied.
Aim
To determine whether RTEs affect erectile rigidity in inflatable penile prostheses and determine what length of RTE should be used for a given corporal length—in this case, 22 cm.
Methods
To assess the effect of RTEs on erectile rigidity, we created a penile model simulating 2 corpora cavernosa that accommodated cylinders of varying lengths. Once the cylinders were inflated, a 200-g weight was then uniformly placed on the tip of the cylinders and deflection was measured using a ruler. Measurements were repeated for varying cylinder/RTE lengths to total 22 cm of overall corporal length.
Outcomes
Differences in rigidity and angular deflection based on RTE length were assessed.
Results
Increasing the length of RTEs increased the deflection in our model, indicative of decreased axial rigidity.
Clinical translations
The current work implies that having additional RTEs may decrease penile rigidity and in turn, patient satisfaction.
Strengths and limitations
Though assessing effect of RTEs on erectile rigidity is novel, the exact ability of our model to predict in-vivo behavior is unknown.
Conclusion
An inflatable penile prosthesis represents a heterogeneous beam given that it is composed of a non-inflatable rear combined to an inflatable cylinder. In this model greater bending deflection was associated with more RTE length. Greater RTE length decreases the size of the inflatable device that can be implanted. The erect penis is subject to axial stress and bending deflection. Though further work is needed, these data support the notion that maximizing inflatable length by minimizing RTEs will improve overall erectile rigidity dynamics.
Thirumavalavan N, Cordon BH, Gross MS, et al. Rear Tip Extenders and Penile Prosthesis Rigidity: A Laboratory Study of Coloplast Prostheses. J Sex Med 2018;15:1030–1033.

QuestionGuy wrote:Thanks Greg. So what are the trees? Are there bones or cartilage that the base is wedged into? It can't just be flesh. (can it?)

[pdf] AMS 700 with MS pump "Operating room manual"-Boston Scientific

https://www.google.com/url?q=https://do ... wKQIzI8mod

This answers many questions surrounding implants.

Imagine an xx[?] cm Hydralic cylinder activated within an XX[?] cm tube.

Think rear wheel "Brake Cylinder" on an automobile.

The rear "tip" presses into the Crus toward (against) the pelvic bone.
The
The foreward "tip" presses toward the Glans. [muscle/tissue/flesh.]