The Bahr Skin Conductance Monitor
The Bahr Skin Conductance Monitor is a miniature device designed to collect data on skin conductance from ambulatory research subjects for up to seven days. This monitor was specifically designed to measure and record hot flashes. The monitor clips directly unto the self-adhesive gel electrode patch eliminating the need for any cables. It is worn unobtrusively on the sternum hidden under clothing and is easy to remove and replace. See link to Products for more information.
bpSure, LLC Prototype System
Bahr Management is part owner of a company called bpSure, LLC that owns a technology, which can measure blood pressure in environments that have significant noise and motion artifact. The patented method operates in the here to fore unused narrowband frequency range of 15 to 25 Hz. Narrowband array processing of the pressure waveform generated under an occlusion cuff near the brachial artery can be used to estimate systolic and diastolic blood pressures. Although the detected signals do not have frequency content in the audible range, the name ascultatory has been used to describe the method because microphones are used in a fashion similar to the traditional method, and the characteristics of the processed pulse data bear a resemblance to Korotkoff sound behavior. An example for data acquired in an ambulance shows the significant processing gain that can be achieved in noisy environments with this new method. This technology is available for sale or licensing. See link to Papers for more information.
Period Domain Transform Algorithm
Period Domain Transform analysis utilizing an incremental discrete period transform (DPT) algorithm is an effective and efficient way to process periodic non-stationary biomedical signals for spectral content. It provides the capabilities of frequency domain analysis, with certain advantages in implementation. Processing of photoplethysmographic fetal pulse oximeter signals with period domain analysis improves pulse rate availability and accuracy, and permits removal of interference by techniques such as ensemble averaging without an external noise reference. The photoplethysmographic signals acquired during pulse oximetry can be compromised in many ways. Intrapartum fetal pulse oximetry in particular presents challenges to signal processing. Period domain analysis can overcome the low pulsatile amplitudes, noise, and maternal modulation found in these signals. The efficiency of an incremental algorithm reduces the processing requirements for period domain analysis, facilitating use in low-power and portable devices. This technology is available for sale or licensing. See link to Papers for more information.