Journal: Sensors (Basel, Switzerland)

Article Title: An Advanced Bio-Inspired PhotoPlethysmoGraphy (PPG) and ECG Pattern Recognition System for Medical Assessment

doi: 10.3390/s18020405

Figure Lengend Snippet: The ECG Patter Recognition GUI: First window shows the segmented ECG waveform according to segmented PPG onset (t k ); The second ones reports segmented ECG (red) and first derivative of corresponding PPG waveform (dPPG/dt—blue) while the third window reports graphical representation of the segmented ECG (red) and reference ECG pattern (blue). Both waveforms plotted in second and third windows will be used for sample cross correlation analysis as previous described in Equations (3) and (4).

Article Snippet: [ , ]. reports representative results for the robustness of the proposed pattern recognition algorithm as well as the developed MATLAB ® GUI.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: An Advanced Bio-Inspired PhotoPlethysmoGraphy (PPG) and ECG Pattern Recognition System for Medical Assessment

doi: 10.3390/s18020405

Figure Lengend Snippet: ( a ) The first sub-window shows an instance of noised PPG signal (red) properly filtered as reported in the second sub-window; ( b ) Medical indicators computation (HRV, Augmentation index (AI), BPM) included in the Pattern Recognition System GUI; ( c ) The described PPG pattern recognition system with detail about accepted PPG waveforms; ( d ) The proposed ECG pattern recognition diagrams with detail about accepted ECG waveforms.

Article Snippet: [ , ]. reports representative results for the robustness of the proposed pattern recognition algorithm as well as the developed MATLAB ® GUI.

Techniques:

Journal: Nature medicine

Article Title: EPIDURAL STIMULATION OF THE CERVICAL SPINAL CORD FOR POST-STROKE UPPER LIMB PARESIS

doi: 10.1038/s41591-022-02202-6

Figure Lengend Snippet: (a) An image of the stimulator (DS8R, left) and 1-to-8 channel multiplexer (D188, right) used to deliver stimulation pulses. (b) An overview of the control scheme used to deliver patterns of stimulation. A PC running a (c) MATLAB based GUI communicated with a microcontroller using a custom (d) communication protocol over a virtual serial port. The microcontroller’s firmware delivered pulse triggers and amplitude control signals to the stimulator as well as an 8 bit parallel channel selection signal to the multiplexer in order to control pulse timing, amplitude, and output channel. Current was delivered from the stimulator through the multiplexer and ultimately to the selected electrode on the implanted spinal array. (c) The GUI interface allowed for configuring all stimulation parameters including active channels, stimulation frequency, pulse train duration (or continuous), pulse train latency, and stimulation amplitude for each active channel. Once configured, stimulation was initiated or terminated via the software interface. The software also allowed for rapid changes in either global stimulation frequency (nudge frequency) or channel amplitude (nudge amplitude). (d) A custom command protocol layer was developed on top of a UART serial interface to enable communication between the GUI and microcontroller. Each packet from the master (PC) to the slave (microcontroller) comprised a 1 byte packet length, 1 byte command, and 0–6 bytes of payload. A payload comprised a 1 byte parameter (to be read or written), a 1 byte channel number (when appropriate), and the value to be written (when ‘write’ command was used). Microcontroller response packets comprised a 1 byte packet length, 1 byte command echo, 0–32 bytes of payload (used to return parameter values during ‘read’ command), and a 1 byte success flag. (e) The microcontroller firmware allowed for pseudo-synchronous stimulation across multiple channels by interleaving pulses on all active channels. A delay of at least 1 ms between each pulse allowed enough time for the multiplexer to fully switch channels. The same pattern of pulses was delivered every period as defined by the stimulation frequency. Each channel could also be configured to deliver a single pulse, a pulse train with finite duration and/or latency, continuous stimulation, or a ‘recruitment curve’ in which the amplitude was gradually increased for successive pulse trains of specified length.

Article Snippet: A PC running a (c) MATLAB based GUI communicated with a microcontroller using a custom (d) communication protocol over a virtual serial port.

Techniques: Selection, Software