Abstract: A stent includes linear struts that form an outer periphery of a cylindrical shape in which a gap is formed between adjacent struts. Each strut has a first convex portion that protrudes inward in a radial direction R in at least a portion in a cross section along an axial direction of the cylindrical shape, and, in a state in which the stent is indwelled in a lumen in a living body, the first convex portion has a vertex that is formed to be positioned more on an upstream side of blood flow than a downstream side of blood flow and an upstream curved portion that curves and extends to protrude inward in the radial direction from the vertex toward the upstream side.

Abstract: A high-frequency filter includes a first output to output a first signal, a first filter, a second filter, and a first matching circuit connected to an output of the first filter and to an output of the second filter. The first signal is provided to the first output from one of the output of the first filter and the output of the second filter via the first matching circuit. The first matching circuit includes a resonator connected in series between the first output and the output of only one of the first filter and the second filter.

Abstract: An acoustic wave element comprising a lithium tantalate substrate having the Euler angles (?, ?, ?), a first component ? satisfying 10°???50°; and an electrode disposed on the lithium tantalate substrate and configured to excite a main acoustic wave of wavelength ?, the electrode having a density ?M satisfying ?M??Ti where ?Ti represents a density of titanium (Ti), and a thickness hM of the electrode satisfies 0.141×exp(0.075?M)??hM?0.134? Embodiments of the present disclosure minimize a thickness of the electrode and suppress a spurious Rayleigh wave signal.

Abstract: A ladder-type elastic wave filter includes an input terminal, an output terminal, and a ground terminal, a first series resonator and a second series resonator connected in series between the input terminal and the output terminal, and a first parallel resonator having a first terminal electrically connected to the series connection between the first series resonator and the second series resonator and a second terminal electrically connected to the ground terminal. A resonance frequency of the first parallel resonator is higher than a resonance frequency of both of the first series resonator and the second series resonator and lower than an antiresonance frequency of both of the first series resonator and the second series resonator.

Abstract: Aspects and examples reduce the insertion loss and the noise figure of a filter module, which is configured by capacitive elements such as surface acoustic wave resonators and impedance matched. In one example, the filter module includes a filter having a certain passband and a matching resonator for impedance matching of the filter, the passband of the filter being included in a frequency band ranging between a resonant frequency and an antiresonant frequency of the matching resonator, and a center frequency of the passband of the filter being lower than a center frequency of the band ranging between the resonant frequency and the antiresonant frequency of the matching resonator.

Abstract: To provide a stent delivery system configured to prevent twisting of a strut during expansion of a stent. A balloon has a plurality of limb portions folded at a plurality of folding pleats in a deflated state. The limb portions are folded in a first circumferential direction to surround the shaft as seen from a proximal end side of an axial direction of the shaft. The strut of the stent has helical portions formed in a helical shape extending along a second circumferential direction opposite to the first circumferential direction as seen from the proximal end side of the axial direction with being centered on an axis extending along the axial direction of the shaft.

Abstract: A filter device that reduces spurious emissions generated in a frequency band 1.2 to 1.4 times greater than a center frequency of a passband of a filter. In one example the filter device includes a first filter connected between a common contact and a first signal contact and having a first passband, and a second filter connected between the common contact and a second signal contact and having a second passband with a center frequency in a range of 1.2 to 1.4 times greater than a center frequency of the first passband. The first filter includes a SAW filter formed on a piezoelectric substrate, a SAW resonator formed on the piezoelectric substrate and connected in series between the common contact and the SAW filter, and a dielectric film covering the SAW filter and SAW resonator, the dielectric film having a reduced thickness in a region corresponding to the SAW resonator.

Abstract: A stent Includes a stent body formed by a strut. The stent body is cylindrically-shaped and extends in an axial direction. The stent body includes a plurality of helical portions and an annular portion. The strut is helically-shaped along the axial direction to form the plurality of helical portions and the strut is annularly-shaped in the circumferential direction to form the annular portion. Each of the plurality of helical portions has a distal end point and a proximal end point. The plurality of helical portions include a first helical portion and a second helical portion adjacent to the first helical portion in the axial direction. The annular portion is disposed between the first and second helical portions in the axial direction. At least one of the distal and proximal end points of the plurality of helical portions is directly connected to the annular portion.

Abstract: An elastic wave device includes an interdigital transducer (IDT) electrode in contact with a piezoelectric substrate having a bus bar electrode region including one of a first bus bar electrode and a second bus bar electrode of the IDT electrode, an alternately disposed region where first electrode fingers are alternately disposed with second electrode fingers of the IDT electrode, and an intermediate region including one of the first electrode fingers and the second electrode fingers. A dielectric film is formed in at least part of the intermediate region and in contact with an upper surface of the IDT electrode. The dielectric film includes a medium in which an acoustic velocity of a transverse wave propagating in the dielectric film is lower than an acoustic velocity of a main elastic wave of the alternately disposed region. The dielectric film is not formed in the alternately disposed region.

Abstract: A high-frequency filter including first and second signal terminals, a filter circuit having a passband and a stopband and being connected between the first signal terminal and the second signal terminal, and an additional circuit connected in parallel with the filter circuit between the first signal terminal and the second signal terminal. The filter circuit is configured to provide a first output signal responsive to receipt of an input signal. The additional circuit has an attenuation band within the stopband, and is configured to provide a second output signal responsive to receiving the input signal, the first and second output signals having phase components opposite to each other in the attenuation band.

Abstract: A high-frequency filter including first and second signal terminals, a filter circuit having a passband and a stopband and being connected between the first signal terminal and the second signal terminal, and an additional circuit connected in parallel with the filter circuit between the first signal terminal and the second signal terminal. The filter circuit is configured to provide a first output signal responsive to receipt of an input signal. The additional circuit has an attenuation band within the stopband, and is configured to provide a second output signal responsive to receiving the input signal, the first and second output signals having phase components opposite to each other in the attenuation band.

Abstract: A stent has mechanical properties changing in a multistage manner and capable of effectively exhibiting functions thereof in response to a period after indwelling. A stent includes linear struts forming an outer circumference of a cylindrical shape with gaps formed therein and a plurality of link sections each containing a biodegradable material and connecting the struts to each other in each of the gaps, includes at least two link sections having different decomposition periods under identical conditions.

Abstract: An electronic device includes a main circuit connected between an input terminal and an output terminal, and an auxiliary circuit connected in parallel to the main circuit between the input terminal and the output terminal. The main circuit includes a filter having a first passband and a stopband. The auxiliary circuit has a passing characteristic that allows a signal having a frequency in a certain frequency band inside the stopband to pass through the auxiliary circuit. The main circuit is configured to output a main signal in response to an input signal. The auxiliary circuit is configured to output an auxiliary signal in response to the input signal. The main signal and the auxiliary signal contain phase components opposite to each other in the certain frequency band inside the stopband. This electronic device has an attenuation amount in the stopband.

Abstract: A multimode elastic wave device includes a pair of reflectors, and a first interdigital transducer (IDT) electrode through a fifth IDT electrode arranged between the pair of reflectors. In this configuration, each of the average of electrode-finger pitches in the first IDT electrode and the average of electrode-finger pitches in the fifth IDT electrode is smaller than both of the average of electrode-finger pitches in the second IDT electrode and the average of electrode-finger pitches in the fourth IDT electrode.

Abstract: In a ladder-type elastic wave filter, a resonance frequency of a second parallel resonator is higher than that of a series resonator and lower than an antiresonance frequency of a series resonator. With this configuration, an attenuation pole is formed by the second parallel resonator at a frequency region lower than an attenuation pole formed by the series resonator in a frequency region higher than the passband of the ladder-type elastic wave filter.

Abstract: In a ladder-type elastic wave filter, a resonance frequency of a second parallel resonator is higher than that of a series resonator and lower than an antiresonance frequency of a series resonator. With this configuration, an attenuation pole is formed by the second parallel resonator at a frequency region lower than an attenuation pole formed by the series resonator in a frequency region higher than the passband of the ladder-type elastic wave filter.

Abstract: An acoustic wave element comprising a lithium tantalate substrate having the Euler angles (?, ?, ?), a first component ? satisfying 10°???50°; and an electrode disposed on the lithium tantalate substrate and configured to excite a main acoustic wave of wavelength ?, the electrode having a density ?M satisfying ?M??Ti where ?Ti represents a density of titanium (Ti), and a thickness hM of the electrode satisfies 0.141×exp(0.075?M)??hM?0.134? Embodiments of the present disclosure minimize a thickness of the electrode and suppress a spurious Rayleigh wave signal.

Abstract: An acoustic wave sensor includes a piezoelectric substrate, a transmitting electrode configured to excite a main acoustic wave propagating through a propagation region of an upper surface of the piezoelectric substrate, a receiving electrode configured to receive the propagated main acoustic wave, a first insulating film provided on the propagation region of the upper surface of the piezoelectric substrate, a second insulating film provided on the upper surface of the piezoelectric substrate to cover the first insulating film, and a reaction section provided on the upper surface of the second insulating film above the propagation region. The reaction section is configured to react with an object. A velocity of a transverse wave propagating through the first insulating film is higher than a velocity of a transverse wave propagating through the second insulating film. The acoustic wave sensor described above has high detection sensitivity.

Abstract: An electronic device includes a main circuit connected between an input terminal and an output terminal, and an auxiliary circuit connected in parallel to the main circuit between the input terminal and the output terminal. The main circuit includes a filter having a first passband and a stopband. The auxiliary circuit has a passing characteristic that allows a signal having a frequency in a certain frequency band inside the stopband to pass through the auxiliary circuit. The main circuit is configured to output a main signal in response to an input signal. The auxiliary circuit is configured to output an auxiliary signal in response to the input signal. The main signal and the auxiliary signal contain phase components opposite to each other in the certain frequency band inside the stopband. This electronic device has an attenuation amount in the stopband.

Abstract: A high-frequency filter includes a first output to output a first signal, a first filter, a second filter, and a first matching circuit connected to an output of the first filter and to an output of the second filter. The first signal is provided to the first output from one of the output of the first filter and the output of the second filter via the first matching circuit. The first matching circuit includes a resonator connected in series between the first output and the output of only one of the first filter and the second filter.