Questions About Penile Implant

Anonymous Contributor answers:

The concept of the penile prosthesis dates back to early times when it was noticed that several species of animals had what was termed an os penis or biaculum. This is a cartilaginous support to keep the penis erect. The first penile prosthesis was actually a rib graft implanted into the corporal body.

The recent history of penile prosthesis dates back to 1950, when Dr. Scardino implanted the first synthetic material into the penis. Penile implants improved dramatically with subsequent work of many investigators, and penile implant surgery has progressed to a very high level.
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The indications for penile implant surgery include vascular disease, diabetes, bladder or prostate cancer surgery or for benign prostate disease, Peyronie’s disease, neurologic disease, hypogonadism, pelvic fractures and impotence related to many medical diseases including chronic renal disease, alcoholism, multiple sclerosis, genital trauma, Parkinsonism, and drug therapy.

Some of the contraindications for penile implants include poorly controlled diabetes, mostly because the patient is highly susceptible to infection, and extreme bladder outlet obstruction, because a prosthesis can cause a relative increase in outflow obstruction and eventually produce urinary retention.

When choosing a penile prosthesis, it is important to recognize the major categories. These include:

rigid, semi-rigid and malleable rods, which produce varying degrees of rigidity
inflatable prostheses which include two types;
a) the multi-component inflatable prosthesis, and
b) the self contained inflatable prosthesis.
The main objective is to leave the patient with a penis that allows achievement of sexual intercourse with no complications, when it is desired and in a way that satisfies both partners. There is no single penile prosthesis that is best for all patients so it is imperative that the urologist sit down with the patient and carefully review the risks, benefits, and drawbacks to each type.

When discussing the semi rigid prosthesis, the upside of the balance sheet includes an erection sufficient for penetration. This is called axial rigidity in the urologic spectrum and means the amount of torque that can be placed on the penis. Most of the rigid prostheses are associated with a low mechanical failure rate because there are no moving parts and a fairly simplistic implantation is possible. The downside is that they produce an erection that may be noticeably unsightly, and because these devices are the most likely to create an obstruction that can interfere with urination. Also, if prostate surgery is needed in the future, it can be very difficult because of the implant. However, the rigid prothesis is good for men with poor hand mobility, who are relatively elderly, or who do not want the increased risk of malfunction that can result from moving parts.

The one-piece inflatable penile prosthesis offers a compromise between the multi-component inflatable and the semi-rigid device. The downside to this device is that it can sometimes be difficult to manipulate. It doesn’t become as erect as the rigid one and it doesn’t deflate as much as the multi-component inflatable. Additionally, this device is limited to the “average size penis,” and if the patient has an extremely long penis is usually is not adequate.

The multi-component inflatable prosthesis is what we call the “Cadillac” device. It gives the best appearance when erect and is the softest when deflated. It is probably the most popular and there are several major manufacturers including American Medical Systems and Mentor.

Several penile prostheses are no longer in vogue and do not have a place in modern implant surgery. For example, the small carrying prosthesis introduced in 1973, available in numerous sizes and lengths, was a reasonable device, but failed to produce the axial rigidity necessary for intercourse and was supplanted by better models.

The Jones Prosthesis was a malleable rod consisting of an outer silicone shell and silver wires in a twisted configuration that allowed some degree of torqueing and an accompanying loss of some axial rigidity. This was supplanted with a trimmable version to ensure adequate sizing.

American Medical Systems introduced the malleable prosthesis, which provides a very adequate erection, but one that can be very unsightly. The fact that the normal erection is a hydraulic event was the rationale behind the inflatable device. It has three pieces including a reservoir to store the fluid, cylinders, and a pump which is placed in the scrotum. The pump transfers fluid from the reservoir into the cylinders, thus creating an erection. When one desires to end the erection, the process is reversed with a releaser deflate valve.

Another American Medical Systems product is the controlled expansion inflatable penile prosthesis which provides increased rigidity. It has reinforced non-kinking tubing, revised pump, and a rear-tip system to allow adequate sizing. Mentor also makes an inflatable prostheses as either a two-piece or three-piece inflatable device.

The type of surgery for the implant is generally based on the surgeon’s experience and the type of device chosen, but can include:

a perineal approach which is under the scrotum;

a penoscrotal approach which is at the base of the penis on top of the scrotum

the protheses may be placed in the penile shaft, or

an infrapubic incision, which is an incision above the penis.

There are advantages and disadvantages to each device, but the most important parts of implanting a penile prosthesis are the selection of proper length and diameter to fit the corpus cavernosum, the general dilation of the corporal body to avoid perforation proximally, and meticulous attention to detail to avoid infections, which includes preoperative preparation, intraoperative antibiotics, and copious irrigation during the procedure.

Complications of the penile implant include infections, which can be disastrous. The cost of treating an infected prosthesis can actually exceed the cost of the original implant. Procedures to avoid infection include use of a surgical bubble system to prevent particles and bacteria from having access to the device.

Another complication includes perforation of the corporal body in the area where the prosthesis is held, which can cause migration of the device. This problem can be managed by creating a Dacron graft to prevent migration. Perforation into the urethra or glans penis can also be disastrous, and any perforation to a potentially infected area, such as the urethra, requires termination of the procedure.

Other problems include tubing kinks, fluid leaks, aneurysm, dilatation of the cylinders, breakage of the wire, silicone spillage, loss of rigidity to the prosthesis, erosion of the reservoir, spontaneous deflation, spontaneous inflation, penile curvature, which is a variant of Peyronie’s disease, pump or pump reservoir migration, and phimosis or paraphimosis, both of which may require circumcision.

Anonymous Contributor answers:

Hahahahahahaha

Anonymous Contributor answers:

I didn’t realize Mr. Ed neded an Implant. No wonder there was no sequel called “Son of Mr. Ed.”

Anonymous Contributor answers:

Now that’s one weenie that I could really sink my mouth into.

Ada

Anonymous Contributor answers:

Sounds awful. I feel bad for guys with erectile dysfunction. I’m sure most women wouldn’t mind and would rather he get to experience sex, even if it meant them getting a penile implant.