Abstract: PD25-12
Sources of Funding: Prostheses were donated by the manufacturing companies

Introduction

We sought out to describe and evaluate the existing inflatable penile prostheses (IPP) in an independent lab setting

Methods

New IPPs were obtained from the two manufacturers: American Medical Systems (Minnetonka, MN) and Coloplast (Minneapolis, MN). The AMS700 LGX (18 cm), CX (18 cm), CXR (15 cm), Coloplast Titan-Touch (18 cm) and Titan-Narrow (14 cm) were interrogated. We measured internal pressure, length and girth of the cylinders at 2ml increments. A urodynamic individual transducer connected to an analog amplifier and recording system was utilized to measure pressure. Rigidity and axial loading of the different IPPs were evaluated with a compression system.

Results

Regular-sized prostheses were inflated to 22 ml and narrow prostheses to 16 ml. Coloplast Titan Touch showed a girth of 17.8 mm at 22 ml compared to 15.6 mm for AMS700 LGX, and 16.5 mm for CX. AMS700 LGX increased a length of 13 mm from baseline, a feature that was unique to that prosthesis among all those tested (Figure 1). Rigidity curves as assessed by compression showed significant variability with both Titan prostheses and AMS CX-R exhibiting similar curve pattern and requiring a higher load to reach 50% compression. The buckling experiment showed different patterns of deformity (Figure 2).

Conclusions

Data suggests that these prostheses exhibit significant physical differences. The clinical impact of these differences is poorly elucidated. These variations in the prostheses behaviors could be considered by the physician and the patient while objectively assessing the choice of the prosthesis. These findings could aid in objective patient counseling.

Funding

Prostheses were donated by the manufacturing companies