Abstract: A self-expanding biological valve has a fixed support (1), an inflow end support structure (5), an outflow end support structure (3) and a silica gel suture ring (4). The fixing support (1) has a stretching part (2), which is disconnected after being subjected to an expansion force, and then the valve expands at a predetermined position. In an unfolded state, the inflow end support structure (5) and the outflow end support structure (3) extend outwards relative to the fixing support (1) in the radial direction for supporting the valve at the preset position, and continuously applying outward and/or downward force to surrounding tissues, so as to ensure reliable fixation of the valve. The present valve can achieve valve replacement without a complex suture, the operation time is shortened, the risk of complications after operation is reduced.

Abstract: The present disclosure provides an adapter circuit including a bus capacitor, a PMOS power transistor, and a sampling control module; a positive terminal of the bus capacitor is connected to a DC bus voltage, and a negative terminal of the bus capacitor is connected to a drain of the PMOS power transistor; a gate of the PMOS power transistor is connected to a drive signal, and a source of the PMOS power transistor is grounded; the sampling control module is used to obtain the drive signal by detecting an AC mains input voltage and a power-down voltage when the bus discharges, so as to turn off the PMOS power transistor after the AC mains input voltage reaches a peak value, and turn on the PMOS power transistor after the power-down voltage reaches a set voltage; the drive signal includes a PMOS Turn-on signal and a PMOS Turn-off signal.

Abstract: The present disclosure provides an adapter circuit including a bus capacitor, a PMOS power transistor, and a sampling control module; a positive terminal of the bus capacitor is connected to a DC bus voltage, and a negative terminal of the bus capacitor is connected to a drain of the PMOS power transistor; a gate of the PMOS power transistor is connected to a drive signal, and a source of the PMOS power transistor is grounded; the sampling control module is used to obtain the drive signal by detecting an AC mains input voltage and a power-down voltage when the bus discharges, so as to turn off the PMOS power transistor after the AC mains input voltage reaches a peak value, and turn on the PMOS power transistor after the power-down voltage reaches a set voltage; the drive signal includes a PMOS Turn-on signal and a PMOS Turn-off signal.

Abstract: A method and device for a compact microstrip bandpass filter that includes an input terminal, an output terminal, a plurality of quarter-wavelength resonators, a resonant disk, a plurality of layers, and a microstrip line which connects the resonant disk to a joint point of the quarter-wavelength resonators. A method of forming two signal paths in a compact microstrip bandpass filter includes forming a first signal path between an input terminal and an output terminal of the filter with a plurality of quarter-wavelength resonators with a resonant disk and a microstrip line which connects the resonant disk to a joint point of the quarter-wavelength resonators. The method includes forming a second signal path of the quarter-wavelength resonators, the filter includes a plurality of layers.

Abstract: A method and device for a compact microstrip bandpass filter that includes an input terminal, an output terminal, a plurality of quarter-wavelength resonators, a resonant disk, a plurality of layers, and a microstrip line which connects the resonant disk to a joint point of the quarter-wavelength resonators. A method of forming two signal paths in a compact microstrip bandpass filter includes forming a first signal path between an input terminal and an output terminal of the filter with a plurality of quarter-wavelength resonators with a resonant disk and a microstrip line which connects the resonant disk to a joint point of the quarter-wavelength resonators. The method includes forming a second signal path of the quarter-wavelength resonators, the filter includes a plurality of layers.