New Penile Prostheses Found Easier to Use
Modified AMS 700 Series devices elicit high degree of patient satisfaction.
The findings are based on a six-month follow-up of 32 men diagnosed with organic erectile dysfunction who underwent implantation of an AMS 700 series penile prosthesis with the new Momentary Squeeze Pump. Findings were presented here at the Société Internationale d'Urologie 29th Congress.
Overall, there was a high degree of satisfaction with respect to ease of inflation and deflation of the device as documented by patient questionnaires, said principal investigator Ajay Nehra, MD, professor of urology at Mayo Clinic College of Medicine in
“Developments in the field of biosynthetic materials have allowed physicians the use of artificial/mechanical devices to replace malfunctioning or damaged body parts and organs,” Dr. Nehra pointed out in a poster presentation.
“These devices, or prostheses, are not compatible with long-term error-free function and are limited to minimal local tissue reaction. They have replaced earlier attempts at using tissue from donor areas and even xenografts in substituting damaged organs.”
Historically, penile prosthetic surgery did not become popular until the early '70s with the introduction of the first inflatable penile prosthesis and paired semirigid intercorporeal sponge-filled silicone implants followed by the flexirod prosthesis.
As for the hydraulic devices that are used today, modifications have resulted in significant improvements in overall mechanical failure rates. Recently, the FDA approved additional modifications in the AMS 700 series. Specifically, changes were made to the scrotal pump to ease deflation. In addition, angulation changes were made in the exit tubing of the penile cylinders to ease proximal and distal positioning. A new feature was added to the pump's fluid to resist flow into the deflated cylinders caused by pressure on the fluid-filled reservoir with auto-inflation.
Of the study participants, 29 had primary placement of the device, and three underwent explant of malfunctioning penile prosthesis and immediate re-implant of an AMS 700 MS prosthesis. There have been no cases of infection.
Fifteen of 19 patients who completed the questionnaire six months after surgery said that they were very satisfied with the device, two re-ported being moderately satisfied, and two described themselves as somewhat dissatisfied.
All 19 respondents agreed that it was easy to find the device for inflation of the cylinders. Eighteen patients agreed or tended to agree that it was easy to hold the pump while inflating, and 18 reported that there was a reasonable amount of force required to inflate the device. Sixteen reported that they could inflate the device with relative ease.
Eighteen respondents felt that the force required to initiate deflation was reasonable. Nineteen reported that the amount of time required to hold the deflation button to deflate the device was reasonable, and all of them stated that the amount of time required to actually deflate the device was reasonable. Seventeen stated that the overall ease of deflating the prosthesis was either very easy or easy.