There is a need for robust and portable system, and apparatus for ophthalmology. This allows persons who speak different languages and who are used to conducting transactions in different currencies to readily engage in business transactions. The present invention circular ablation system CAS includes a multiplicity of expandable needles that can be expanded around a central axis and positioned to inject a fluid like ethanol to ablate conductive tissue in a ring around the ostium of a pulmonary vein quickly and without the need for expensive capital equipment. Such an approach enables the required ESD protection to be provided locally within the functional circuitry, whilst retaining flexibility with regard to the placement of, and routing between, the various functional components of the functional circuitry.