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Comprehensive in-vivo biomechanical study of IPP function dependent on length of RTE

Wallen, JJ1; Barrera, EB2; Ge, L2; Carrion, RE3; Pastuzak, AW 4; Perito, PE5; Hakky, TS 6

1: Florida Hospital - Tampa, United States; 2: Rice University - Houston, United States; 3: University of Southern Florida - Tampa, United States; 4: Baylor - Houston, United States; 5: Perito Urology - Coral Gables, United States; 6: Advanced Urology - Atlanta, United States

Objectives: A comprehensive in-vivo biomechanical study of the 3 most popular inflatable penile prosthesis (IPP) brands was conducted where the effect of rear tip extenders was compared in a three cadaver in vivo study. Certified and recognized surgeons inserted the IPPs and recognized scientists and engineers conducted biomechanical testing using approaches that were correlated to standard test methods.

Materials and Methods: Longitudinal compression, modified cantilever deflection, and flexural 3-point bending were used to compare the three IPPs where each were surgically inserted with 1cm, 1.5cm, or 2cm rear tips in three cadavers and inflated to 10psi and 20psi conditions. Furthermore for a corporal length IPP of 20cm made by using an 18cm + 2cm rear tip, a 20cm IPP with no rear tip was tested for comparison. Funding for this study was obtained from Coloplast Corporation.

Results: Compression, modified cantilever, and bend data were acquired for the in vivo IPPs. Analysis was assessed based on kink formation in compression, max loading in cantilever testing and 3-point bend testing. Rigidity was also used to assess rear tip effects. Testing order, sequence, and pressure level were other parameters for the assessment.

Conclusions: In this study the role of rear tips and how they anchor the IPP was assessed. These tests in cadavers show differences in anchoring yet the longer time that the IPP is in a living body may lead to an indifference in anchoring since the tissue grows around the IPP whether it has a rear tips or not.


Work supported by industry: yes, by Coloplast Corp (industry funding only - investigator initiated and executed study). The presenter or any of the authors act as a consultant, employee (part time or full time) or shareholder of an industry.

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