Abstract:
The invention relates to a catheter system. The system comprises a catheter body having a chamber containing a low acoustic impedance medium. The catheter body includes an elongated body with an external surface and an ultrasound transducer having an external side between a first end and a second end. The ultrasound transducer is positioned over the external surface of the elongated body such that the first end is adjacent to the chamber.
Abstract:
A piezoelectric micromechanical ultrasonic transducer (PMUT) includes a multilayer stack disposed on a substrate. The multilayer stack may include an anchor structure disposed over the substrate, a piezoelectric layer stack disposed over the anchor structure, and a mechanical layer disposed proximate to the piezoelectric layer stack. The piezoelectric layer stack may be disposed over a cavity. The mechanical layer may seal the cavity and, together with the piezoelectric layer stack, is supported by the anchor structure and forms a membrane over the cavity, the membrane being configured to undergo one or both of flexural motion and vibration when the PMUT receives or transmits ultrasonic signals.
Abstract:
A transducer for multiple purposes is provided. Different backings (24, 26) are used for different elements (18) of a same array. The different backings (24, 26) optimize the respective elements (18) for the desired use. A soft backing (e.g., Z = 3 Mrayl)(24) is used behind some elements (18) for ultrasound imaging. A hard backing (e.g., Z=100 Mrayl)(26) is used behind other elements (18) for lower frequency operation
Abstract:
A resonance oscillator comprises an active, e.g. disk-shaped, oscillator part (2) which is brought into contact, forming a couple oscillator, with a passive, relatively long oscillator part. This oscillator part, which basically determines the resonance frequency, consists of a variable-length solid column or liquid column (11) the length of which can be varied continuously in the direction of the sound vector in order to change the resonance frequency. The active oscillator part (2) is mounted on the base of an elongated resonance container (6) which contains the liquid that forms the liquid column (11). The length of the liquid column is varied by sliding a piston (5). The resonance container (6) is bounded by a corrosion-resistant, high-strength covering disk (7) of minimal thickness and is connected to an equalizing container (9) which receives the liquid displaced by the piston from the resonance container and returns the liquid to the resonance container.
Abstract:
L'invention concerne un transducteur (38) ultrasonore comprenant : - au moins une plaquette piézoélectrique présentant deux faces principales planes parallèles : une face frontale et une face postérieure, - au moins un plateau postérieur présentant deux faces principales planes parallèles : une face antérieure et une face arrière, la face antérieure dudit plateau postérieur s'étendant en regard et au contact de la face postérieure de la plaquette piézoélectrique, caractérisé en ce que : - le plateau postérieur présente une épaisseur comprise entre trois et sept fois l'épaisseur de la plaquette piézoélectrique, - le plateau postérieur présente une impédance acoustique comprise entre 10MPa.s.m -1 et 35MPa.s.m -1 . L'invention concerne un procédé de montage d'un tel transducteur (38) ainsi qu'un débitmètre comprenant au moins un tel transducteur 20 (38).
Abstract:
연성 인쇄회로기판의 금속층이 두꺼운 초음파 트랜스듀서 및 그 제조방법이 개시된다. 본 발명의 일 실시 예에 따른 초음파 트랜스듀서는 초음파 신호를 발생하되 발생하는 초음파 신호의 중심 주파수에서 1/4-파장 이하의 두께를 가지는 능동소자와, 능동소자의 일 면에 형성되어 능동소자와 전기적으로 연결되되 예정된 초음파 진행경로와는 반대 방향으로 전파되는 초음파를 차단하기 위한 소정의 두께를 가진 금속층을 포함하는 연성 인쇄회로기판을 포함한다.
Abstract:
An ultrasonic probe comprising a piezoelectric element, a first electrode formed on a substantial portion of a first main face, a first side face and a part of a second main face of the piezoelectric element, and a second electrode formed on a substantial portion of a second main face, a second side face and a part of a first main face of the piezoelectric element, the two electrodes being isolated from each other by two grooves formed on the first and second main faces of the piezoelectric element, in a manner parallel to the side edges of the piezoelectric element, respectively, has good vibration and probing properties.
Abstract:
In an ultrasound transducer (1), a piezo-ceramic element (2) and an active material element (3) are joined to form a composite body in which the speed of sound is greater than in the piezo-ceramic element (2). This makes it possible to narrow the aperture angle PHI of the main sonic beam according to requirements.
Abstract:
An ultrasonic transducer comprises a working member (12) of piezo-electric material having at least two surface regions (13, 14) separated by a boundary surface region (15); a film layer (16, 17) of conductive material on each surface region (13, 14); a conductor (18, 19) whereby a voltage can be applied to each film (16, 17); a protective non-conducting mask (22, 23), for each of the film layers and in intimate contact therewith, the mask (22, 23) comprising a fibre reinforced material. In addition to the transducer methods are described of fabricating the transducer with intimate contact between film layer and mask. At least one passage (50, 68) can be provided through the working member (12) and a web (50A, 68A) of the fibre reinforced material located through the, or each, passage (50, 68) so that the or each web (50A, 68A) has one end integral with one mask (22, 23) and the other end integral with the other mask (23, 22) to form a mechanical link between different regions of one mask or between two masks. This arrangement provides for a stronger mechanical linkage of the protective mask (22, 23) to the body (12) of the transducer. It also serves to preserve the shape of a flexible working member (12) which is distorded into a predetermined shape prior to the mask material (22, 23) polymerising to form a rigid structure. The transducer (51) can include a backing member (60) serving to direct the acoustic output of the transducer predominantly in a particular direction (A) either by reflecting or attenuating acoustic output that would otherwise be generated in any other direction that the particular direction (A).