Uniform speed B ultrasound sector scanning motion device

Abstract

The invention discloses a uniform-speed B-ultrasonic sector scanning motion device, which relates to a scanning device. It includes transducer, transducer frame, probe frame, permanent magnet, coil, coil mounting frame, ball bearing, shaft and control unit. The layout is fixed with four permanent magnets according to the polarity. The transducer frame is connected to the shaft through two ball bearings. The shaft and the control unit are fixed on the probe frame. The coil mounting frame is fixed on the shaft. Two coils are arranged and fixed, and the coils are electrically connected to a control unit that collects speed information and controls the current of the coils, and permanent magnets are arranged on both sides of the coils. The invention has the advantages of compact structure, easy processing, simple assembly, improved transmission efficiency, reduced cost, no wear in the movement process, and more stable and reliable performance.

Description

technical field [0001] The invention relates to a scanning device, in particular to a uniform-speed B-ultrasonic sector scanning motion device. Background technique [0002] At present, most of the B-ultrasound sector scanning motion devices on the market are realized through mechanical transmission, that is, the rotational motion of the motor is converted into the swing of the probe through the transmission mechanism, so as to realize the desired sector scanning motion, such as China Invention Application Patent No. The transmission mechanism in a kind of ophthalmic B-ultrasound probe described in CN102613991A uses a pair of orthogonal bevel gears to convert the rotational motion of the motor into the fan-shaped scanning motion of the probe. The use of orthogonal bevel gear transmission has the advantages of simple and accurate transmission. However, general scanning devices have certain restrictions on the size, such as B-ultrasound probes used in ophthalmology, the entire...

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Problems solved by technology

[0002] At present, most of the B-ultrasound sector scanning motion devices on the market are realized through mechanical transmission, that is, the rotational motion of the motor is converted into the swing of the probe through the transmission mechanism, so as to realize the desired sector scanning motion, such as China Invention Application Patent No. The transmission mechanism in a kind of ophthalmic B-ultrasound probe described in CN102613991A uses a pair of orthogonal bevel gears to convert the rotational motion of the motor into the fan-shaped scanning motion of the probe. The use of orthogonal bevel gear transmission has the advantages of simple and accurate transmission. However, general scanning devices have certain restrictions on the size, such as B-ultrasound probes used in ophthalmology, the entire scanning device needs to be placed in a cylindrical shell with a diameter of 20mm, which limits the size of the bevel gear, and it is necessary to process miniature bevel gears , which increases the difficulty of manufacturing; in addition, the orthogonal bevel gear is not easy to assemble, and the quality of the assembly directly affects the uniformity of the scanning motion

There are also some transmission mechanisms that use a cam groove with a specific track to convert the rotational motion into a sectoral scanning motion of the probe. The scanning device using the cam groove mechanism is easy to wear because it relies on the contact between the pendulum needle and the cam groove to realize the scanning movement. Motion accuracy decreases, it is easy to get stuck

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