Abstract: PD25-01
Sources of Funding: None

Introduction

Inadequate axial penile rigidity may occur in some patients solely on the basis _x000D_ of unusual tissue mechanical and/or geometric factors, despite adequate _x000D_ intracavernosal (intraluminal) pressure values and sufficient hemodynamic _x000D_ integrity. The objectives were to study influence on cylinder distensibility and _x000D_ the rear tip extender (RTE) on axial rigidity.

Methods

A penile model fixture and bucking test using Instron equipment was _x000D_ performed to evaluate bucking force vs cylinder constriction with 4 cm sleeve _x000D_ lengths with diameters of 11 and 12 mm and the effects of adding RTE _x000D_ (figures 1 & 2). _x000D_

Results

When the cylinder diameter is constricted with a sleeve the buckling force _x000D_ decreases (figure 1). Any cylinder with a 2 cm RTE performs worse than _x000D_ another cylinder of the same length without RTE’s. The 16 cm + 2 cm RTE _x000D_ buckles at a lower force (4 lb) than a 18 cm cylinder with no RTE’s (7.3 lb). _x000D_ With the 3 cm RTE’s the cylinders all perform nearly the same due to the fact _x000D_ that the cylinder base is out of the fixture and the taper leading into the base _x000D_ promotes buckling (figure 2).

Conclusions

A restriction at a localized area along the cylinder length decreases the _x000D_ buckling resistance. Using a longer cylinder without RTE’s is better than using _x000D_ a shorter one with RTE’s. Keeping the cylinder base deep in the crus _x000D_ improves buckling resistance. _x000D_

Funding

None