Research shows IPP tips are too sharp

[edjohn]

Not defending Coloplast, but their main reason for the conical distal tip seems to be for glans support in malleables (reduce odds of hypermobile glans).

That could just be absolute, bullshit marketing. Word is they designed IPPs with such pointy ends to make insertion easier, and they had to come up with positive spins like "a blunt tip would not fully reach the end of the average CC".

On the other hand, they could be right overall... the average CC might be more pointy than we are assuming. Some Drs mention that the implants are pointier than a human CC, but the only study I've seen had a sample count of TWO. We may not know the average as well as we think.

[Doggedly_positive]

Word is they designed IPPs with such pointy ends to make insertion easier.

That is what occurred to me when I was wondering why those tips are the shape that they are.

I would have thought that the designer(s) would have erred on the side of making the tips more hemispherical than conical in order to spread the load over the maximum area, but in my case, I have good engorgement and a relatively large glans, so can't speak from experience re floppy glans.

[edjohn]

I would have thought that the designer(s) would have erred on the side of making the tips more hemispherical than conical in order to spread the load over the maximum area, but in my case, I have good engorgement and a relatively large glans, so can't speak from experience re floppy glans.

It’s interesting though because no matter what your natural shape was, rounder tips would lead to better results in terms of erosion and such. It would result in fuller glans in practice and more comfortable penetration. The body would certainly adapt.

The most likely scenario is the designers just assumed most CC were yam-shaped and decided that matching the natural shape was ideal… which might not even be true either.

[lasthope2.0]

The "easier insertion" reasoning makes more sense to me assuming this surgery is for someone with severe ED + fibrotic distal CC and poor glans encorgement.

Here's a snippet from Gray's anatomy. I didn't find any distal conical references atleast in this edition.

"The Corpora Cavernosa Penis form the greater part of the substance of the penis. For their anterior three-fourths they lie in intimate apposition with one another, but behind they diverge in the form of two tapering processes, known as the crura, which are firmly connected to the rami of the pubic arch. Traced from behind forward, each crus begins by a blunt-pointed process in front of the tuberosity of the ischium. Just before it meets its fellow it presents a slight enlargement, named by Kobelt the bulb of the corpus cavernosum penis.

Beyond this point the crus undergoes a constriction and merges into the corpus cavernosum proper, which retains a uniform diameter to its anterior end. Each corpus cavernosum penis ends abruptly in a rounded extremity some distance from the point of the penis.

The corpora cavernosa penis are surrounded by a strong fibrous envelope consisting of superficial and deep fibers. The superficial fibers are longitudinal in direction, and form a single tube which encloses both corpora; the deep fibers are arranged circularly around each corpus, and form by their junction in the median plane the septum of the penis. This is thick and complete behind, but is imperfect in front, where it consists of a series of vertical bands arranged like the teeth of a comb; it is therefore named the septum pectiniforme."

References:
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).

[2435tjklAS]

Would there be fewer instances of erosion if the IPP or malleable tips conformed more closely to those in the corpora?

Did you read it?

Just by google happened to find a full-text link available: https://pmc.ncbi.nlm.nih.gov/articles/PMC3739224/

[indeed]

The IPP tips are certainly too sharp and also too hard.
I don't see any reason why they need to be solid hard plastic. They should be firm, but not rock hard.

To the malleable guys: I've heard that the tips of the Rigi10 and the Tactra are kind of "soft", like they have some give. Is that true?

[edjohn]

the deep fibers are arranged circularly around each corpus, and form by their junction in the median plane the septum of the penis.

I can’t believe I missed this before… the longitudinal fibers are on the outside meaning the septum should stretch more easily in a lengthwise direction while the outer tunica should resist lengthwise stretching. Off-topic: I wonder if the guys who hang find their BPFSL increases even if their BPEL does not…