Pyostomatitis vegetans (PSV)-pyodermatitis vegetans (PDV): A clinicopathologic study of 7 cases at a tertiary referral center.

BACKGROUND: Pyostomatitis vegetans (PSV)-pyodermatitis vegetans (PDV) is a rare inflammatory mucocutaneous disease associated with inflammatory bowel disease. OBJECTIVE: We sought to evaluate the clinicopathologic findings of PSV-PDV in a series of 7 patients. METHODS: We conducted a retrospective review of all cases of PSV-PDV at the Mayo Clinic from 1995 to 2014. RESULTS: Seven patients with PSV-PDV were included, and all had inflammatory bowel disease. Three had Crohn's disease and 4 had ulcerative colitis. Three patients had peripheral blood eosinophilia. Two had concomitant pyoderma gangrenosum in which pyoderma gangrenosum lesions were recalcitrant to therapy. Primary sclerosing cholangitis was seen in 3 patients. Two patients had direct and 3 had indirect immunofluorescence findings. Tissue eosinophilia was seen in the majority of mucosal and cutaneous lesions. LIMITATIONS: Limited sample size and retrospective study design are limitations. CONCLUSIONS: PSV-PDV is associated with inflammatory bowel disease and primary sclerosing cholangitis and may precede gastrointestinal symptoms. Immunofluorescence findings in select PSV-PDV cases may indicate possible overlap with autoimmune bullous disease. Tissue eosinophilia may be helpful in distinguishing PSV-PDV from pyoderma gangrenosum. Strict control of bowel disease and close monitoring of patients with subclinical disease is warranted.

Translation to Practice: Accelerating the Cycle of Innovation to Impact.

The Office of Translation to Practice (OTP) is housed in the Center for Clinical and Translational Sciences at Mayo Clinic. Established in 2015, the office was tasked with developing and managing novel tools, mechanisms, and processes to facilitate and accelerate the translation of products, such as drugs, biological agents, and medical devices, into practice. Since its inception, the OTP is credited with creating valuable services through several strategic alliances and active scientific and project management involvement. The OTP continues to move forward to assist Mayo Clinic physicians and scientists to interact effectively with internal and external collaborators to advance translational projects that will benefit patients. Best practices, innovations, and nascent successes of the OTP are presented and discussed herein.

Development of Piezo-Driven Compliant Bridge Mechanisms: General Analytical Equations and Optimization of Displacement Amplification.

Compliant bridge mechanisms are frequently utilized to scale micrometer order motions of piezoelectric actuators to levels suitable for desired applications. Analytical equations have previously been specifically developed for two configurations of bridge mechanisms: parallel and rhombic type. Based on elastic beam theory, a kinematic analysis of compliant bridge mechanisms in general configurations is presented. General equations of input displacement, output displacement, displacement amplification, input stiffness, output stiffness and stress are presented. Using the established equations, a piezo-driven compliant bridge mechanism has been optimized to maximize displacement amplification. The presented equations were verified using both computational finite element analysis and through experimentation. Finally, comparison with previous studies further validates the versatility and accuracy of the proposed models. The formulations of the new analytical method are simplified and efficient, which help to achieve sufficient estimation and optimization of compliant bridge mechanisms for nano-positioning systems.