Abstract: A magnetic latching relay with a microswitch, including an insulation case and a microswitch, the insulation case is formed by a base and a cover being fixedly connected, an armature assembly is pivotally connected on the base, the base is provided with an assembly zone for accommodating the microswitch at a position close to the armature assembly, the housing of the microswitch is abutted on the bottom of the assembly zone and is positioned by the assembly zone, a portion of the housing close to the armature assembly is suspended, the space below the portion gives way to the movement of the armature assembly and/or the push card, the cover is pressed the housing; the armature assembly is provided with a pressure rod extending toward the cover, and the pressure rod is pressed or released a trigger spring sheet of the microswitch when the armature assembly is rotated.

Abstract: The present disclosure provides to process intravascular ultrasound (IVUS) images to identify key frames such as the proximal key frame, a distal key frame, and a minimal key frame from the IVUS images based on the raw lumen area, vessel area, and plaque burden. Ones of the key frames can be re-identified based on manipulation of other ones of the key frames.

Abstract: Pressure sensing guidewires and methods for making and using pressure sensing guidewires are disclosed. An example pressure sensing guidewire may include a tubular member having a proximal region and a housing region. An optical pressure sensor may be disposed within the housing region. The optical pressure sensor may include a sensor body and a deflectable membrane coupled to the sensor body. The deflectable membrane may include a polymer. An optical fiber may be coupled to the sensor body and may extend proximally therefrom. A pressure equalization channel is formed in the optical fiber, the sensor body, or both.

Abstract: The present disclosure provides a graphical user interface (GUI) arranged to convey information related to the IVUS images and lesion assessment and provide for the user to manipulate the information. The GUIs can be generated to include a cross-section view without assessments post recording of IVUS images and to depict assessments after navigation through frames of the IVUS images.

Abstract: The present disclosure provides to co-register an external image of a vessel to IVUS images captured within the vessel and provides graphical user interfaces to facilitate modification to the co-registration. Notably, the present disclosure provides for the co-registration even when the IVUS images are captured before the external image or before co-registration is initiated with the external image.

Abstract: The present disclosure provides to identify regions of a cardiac cycle based on pressure measured intravenously during a procedure and to derive a fractional flow reserve from the measured pressure during the identified regions. Further the disclosure provides to derive a trend line of the derived fractional flow reserve while the patient in undergoing a procedure, such as a pre-percutaneous coronary intervention.

Abstract: Pressure sensing guidewires and methods for making and using pressure sensing guidewires are disclosed. An example pressure sensing guidewire may include a tubular member having a proximal region and a housing region. An optical pressure sensor may be disposed within the housing region. The optical pressure sensor may include a sensor body and a deflectable membrane coupled to the sensor body. The deflectable membrane may include a polymer. An optical fiber may be coupled to the sensor body and may extend proximally therefrom. A pressure equalization channel is formed in the optical fiber, the sensor body, or both.

Abstract: Embodiments herein relate to intravascular imaging display systems and related methods. In an embodiment, an intravascular imaging display system is included having a control circuit and a video output circuit. The video output circuit can be configured to generate a display output including a user interface. The user interface can include graphical elements related to a vessel being imaged. The graphical elements can include a first detected feature portion at least partially defined by a first graphic indicator and a second detected feature portion at least partially defined by a second graphic indicator. The first graphic indicator can be visually distinct from the second graphic indicator. The first detected feature portion and the second detected feature portion can be assigned to represent one or more locations along a vessel wall by the control circuit based on a degree of attenuation of an ultrasound return signal crossing a threshold value.

Abstract: The present disclosure provides apparatus and methods to both infer stent expansion (vessel expansion or compliance) and probability of procedural success (vessel patency) from pretreatment diagnostic imaging at the point-of-care and also train an inference model to generate such an inference, thus allowing a physician to choose with greater certainty an optimal treatment tool and treatment protocol for treating a vessel of a patient.

Abstract: This application discloses a voltage conversion circuit, a voltage converter, and an electronic device. The voltage conversion circuit mainly includes a detection circuit having a first detection resistor and a second detection resistor, and a buck-boost circuit of an H-bridge structure. The first detection resistor is connected between one input end of the buck-boost circuit and one bridge arm of the H-bridge structure, the second detection resistor is connected between one output end of the buck-boost circuit and the other bridge arm of the H-bridge structure, and the detection circuit may output a current detection signal based on resistor voltages of the first detection resistor and the second detection resistor.

Abstract: This disclosure provides methods for vascular imaging co-registration and using the co-registered imaging data in guiding live fluoroscopy. Extravascular imaging data includes an extravascular contrast image showing the portion of the blood vessel with contrast showing a visualized anatomical landmark while intravascular imaging data is obtained during a translation procedure that includes one or more intravascular images showing a detected anatomical landmark. The starting location and the ending location of the imaging element on the extravascular imaging data is marked, and the predicted location of the detected anatomical landmark on the extravascular imaging data is marked. The predicted location of the detected anatomical landmark is then aligned with the visualized anatomical landmark.

Abstract: A power supply includes an input power supply, a multiphase interleaved parallel converter, and a current sampling apparatus. The input power supply is configured to supply power to an input end of the multiphase interleaved parallel converter. The multiphase interleaved parallel converter includes at least two phases of converters that are connected in parallel. The current sampling apparatus is connected to a switching transistor in each phase of converter in the at least two phases of converters that are connected in parallel. The current sampling apparatus includes a first sampling resistor. The first sampling resistor is connected to the input end or an output end of the multiphase interleaved parallel converter. The current sampling apparatus is configured to determine an inductor current of a first phase of converter based on a first current that is of the first sampling resistor and that is collected at a first moment.

Abstract: Water soluble organic-inorganic hybrid masks and mask formulations, and methods of dicing semiconductor wafers are described. In an example, a mask for a wafer singulation process includes a water-soluble matrix based on a solid component and water. A p-block metal compound, an s-block metal compound, or a transition metal compound is dissolved throughout the water-soluble matrix.

Abstract: A method, device, and system for evaluating a vessel of a patient, and in particular the hemodynamic impact of a stenosis within the vessel of a patient. Proximal and distal pressure measurements are made using first and second instrument while the first instrument is moved longitudinally in the vessel and the second instrument remains in a fixed position. A series of pressure ratio values are calculated, and a pressure ratio curve is generated. The pressure ratio curve may be output to a display. One or more stepped change in the pressure ratio curve are identified using an Automatic Step Detection algorithm. An image is obtained showing the position of the first instrument within the vessel that corresponds to the identified stepped change. The image is registered to the identified stepped change in the pressure ratio curve. The image may be output to the display.

Abstract: Methods include capturing intravascular ultrasound images. A drive motor is used to actively drive an ultrasound transducer at a set rotation speed. A temporary sensing window is created in which the ultrasound transducer is driven with a fixed drive signal. A plurality of signals from are received the ultrasound transducer during the temporary sensing window.

Abstract: A neural network is trained for estimating patient hemodynamic data using a plurality of extravascular imaging data sets and a plurality of intravascular imaging data sets that are each co-registered to a corresponding extravascular imaging data set. A plurality of hemodynamic data sets are provided, each hemodynamic data set co-registered with the corresponding extravascular imaging data set. The neural network learns what hemodynamic data to expect for a given intravascular imaging data set. An intravascular imaging event is subsequently performed in which an intravascular imaging element is translated within a blood vessel of the patient to produce one or more intravascular images. The neural network uses its training to predict hemodynamic values corresponding to the one or more intravascular images from the intravascular imaging event, and the one or more intravascular images are outputted in combination with the predicted hemodynamic values.

Abstract: A method, device, and system for evaluating a vessel of a patient, and in particular the hemodynamic impact of a stenosis within the vessel of a patient. Proximal and distal pressure measurements are made using first and second instrument while the first instrument is moved longitudinally in the vessel and the second instrument remains in a fixed position. A series of pressure ratio values are calculated, and a pressure ratio curve is generated. The pressure ratio curve may be output to a display. One or more stepped change in the pressure ratio curve are identified using an Automatic Step Detection algorithm. An image is obtained showing the position of the first instrument within the vessel that corresponds to the identified stepped change. The image is registered to the identified stepped change in the pressure ratio curve. The image may be output to the display.

Abstract: Methods including methods for processing intravascular ultrasound images are disclosed. An example method may include collecting one or more ultrasound images of a blood vessel and segmenting the ultrasound images with a processor. Segmenting may include identifying one or more of a lumen border of the blood vessel and a media border for media within the blood vessel.

Abstract: Systems for determining fractional flow reserve are disclosed. An example system may include a pressure sensing guidewire for measuring a first pressure, a second pressure sensing medical device for measuring a second pressure, and a processor coupled to the pressure sensing guidewire and coupled to the second pressure sensing medical device. The processor may be designed to generate a plot of the magnitude of the second pressure over time, identify one or more time intervals of the plot that have a slope less than zero, determine a mean of the second pressure, and calculate the ratio of the first pressure to the second pressure when (a) the second pressure is less than or equal to the mean of the second pressure and (b) during the one or more time intervals when the slope of the plot is less than zero.

Abstract: Systems and methods for automatic lesion assessment and/or processing imaging data are disclosed. An example intravascular imaging system may include a catheter including an imaging device. A processor may be coupled to the catheter. The processor may be configured to process imaging data received from the imaging device. The processor may be configured to generate a longitudinal section view of a blood vessel from the imaging data received from the imaging device. The processor may be configured to identify a minimum lumen area along the longitudinal section view of the blood vessel, a distal reference point, and a proximal reference. A display unit may be coupled to the processor. The display unit may be configured to show a display including the longitudinal section view of the blood vessel.