A system for transducing arterial pressure, comprising: a flexible piezo-resistive sensor configured to alter an internal resistance as a function of deflection of the flexible piezo-resistive sensor, wherein the flexible piezo-resistive sensor is affixed to a substrate such that the flexible piezo-resistive sensor deflects into a deflection cavity (315, 402) responsive to pressure applied to a user-interfacing portion; a one-piece flexible cap including: a sidewall sized to fit around the flexible piezo-resistive sensor, and a deflection wall capping the sidewall and shaped to conform between a radius and a flexor carpi radialis tendon, the deflection wall configured to deflect towards the flexible piezo-resistive sensor in proportion to pressure applied by a radial artery, wherein the deflection wall includes a spring region between a user-interfacing portion of the deflection wall and the sidewall, the spring region biasing the deflection wall at a maximum distance from the flexible piezo-resistive sensor when no pressure is applied to the user-interfacing portion; a pressure-transducing medium sealed between the one-piece flexible cap and the flexible piezo-resistive sensor such that deflection of the deflection wall towards the flexible piezo-resistive sensor causes proportional deflection of the flexible piezo-resistive sensor; and an open-ended rigid conduit affixed to the substrate surrounding the flexible piezo-resistive sensor, the open-ended rigid conduit configured to fit flush within the sidewall. a flexible piezo-resistive sensor configured to alter an internal resistance as a function of deflection of the flexible piezo-resistive sensor, wherein the flexible piezo-resistive sensor is affixed to a substrate such that the flexible piezo-resistive sensor deflects into a deflection cavity (315, 402) responsive to pressure applied to a user-interfacing portion; a one-piece flexible cap including: a sidewall sized to fit around the flexible piezo-resistive sensor, and a deflection wall capping the sidewall and shaped to conform between a radius and a flexor carpi radialis tendon, the deflection wall configured to deflect towards the flexible piezo-resistive sensor in proportion to pressure applied by a radial artery, wherein the deflection wall includes a spring region between a user-interfacing portion of the deflection wall and the sidewall, the spring region biasing the deflection wall at a maximum distance from the flexible piezo-resistive sensor when no pressure is applied to the user-interfacing portion; a pressure-transducing medium sealed between the one-piece flexible cap and the flexible piezo-resistive sensor such that deflection of the deflection wall towards the flexible piezo-resistive sensor causes proportional deflection of the flexible piezo-resistive sensor; and an open-ended rigid conduit affixed to the substrate surrounding the flexible piezo-resistive sensor, the open-ended rigid conduit configured to fit flush within the sidewall. a sidewall sized to fit around the flexible piezo-resistive sensor, and a deflection wall capping the sidewall and shaped to conform between a radius and a flexor carpi radialis tendon, the deflection wall configured to deflect towards the flexible piezo-resistive sensor in proportion to pressure applied by a radial artery, wherein the deflection wall includes a spring region between a user-interfacing portion of the deflection wall and the sidewall, the spring region biasing the deflection wall at a maximum distance from the flexible piezo-resistive sensor when no pressure is applied to the user-interfacing portion; a pressure-transducing medium sealed between the one-piece flexible cap and the flexible piezo-resistive sensor such that deflection of the deflection wall towards the flexible piezo-resistive sensor causes proportional deflection of the flexible piezo-resistive sensor; and an open-ended rigid conduit affixed to the substrate surrounding the flexible piezo-resistive sensor, the open-ended rigid conduit configured to fit flush within the sidewall.