Please select the most similar patent number from A, B, C and D. Which number is?
A patient sitting posture restraining device for particle radiotherapy treatment comprises a base mechanism (1), a backrest mechanism (4) installed at the base mechanism (1), and an arm supporting mechanism (5). The arm supporting mechanism (5) comprises a fastening device (51) and an arm supporting assembly (53). The fastening device (51) is detachably installed at an upper portion of the backrest mechanism (4). The arm supporting assembly (53) is movably connected to the fastening device (51). The arm supporting assembly (53) comprises an arm support (535) for supporting an arm of a patient. The patient sitting posture restraining device can be used to fix the head or torso including the thorax and the abdomen of a patient.
A: Disclosed are a fixing apparatus for a vehicle instrument panel cross beam and a vehicle. The fixing apparatus comprises a base plate (1), a connecting part (2) and a fixed beam (3), wherein the base plate is provided with a connecting hole (11); a first end of the connecting part (2) in the vertical direction is fixed with the base plate (1) and a second end is provided with an elongated hole part; and a first end of the fixed beam (3) in the vertical direction has a sliding column (5), the sliding column (5) is slidably arranged in the elongated hole part, and a second end of the fixed beam (3) in the vertical direction is suitable for fixing the vehicle instrument panel cross beam. The fixing apparatus can reduce processing tolerance in the mounting process of an instrument panel cross beam, thereby improving the trimming aesthetic property of a whole vehicle.
B: Provided in the present application is a head and neck stabilizing apparatus, comprising a stabilizing base, replaceable frames, a first cover assembly and a second cover assembly, the stabilizing base comprising a stabilizing bottom plate and a support base, the support base being disposed on the stabilizing bottom plate, a head placement gap being left between the upper end of the support base and the stabilizing bottom plate; there are multiple replaceable frames, the multiple replaceable frames having different thicknesses, and any one replaceable frame being disposed on the support base; the first cover assembly is disposed on the support base, the second cover assembly being disposed on a replaceable frame, and the first cover assembly and the second cover assembly being capable of forming a head placement cavity and a neck constraint part. The head and neck stabilizing apparatus of the present application may be used in radiation therapy for malignant tumors in the head, having ideal stabilizing results for the head and the neck of a person, increasing stabilizing accuracy of the head and neck of the person, causing a patient to be able to obtain ideal treatment results when undergoing radiation therapy for malignant tumors in the head.
C: An arm-held photography support, comprising a connecting seat (1), support arms (2) being connected to the connecting seat (1), one end of each of the support arms (2) being provided with an arm-holding member (3) for abutting against a human arm. The arm-held photography support has a light structure and can be used both for bearing weight and for reducing shake, obtaining a more stable photographic image.
D: A handle (4) having an arm support for use with video recording equipment, comprising a handle gripping part (42) and a connecting part (2), which is used for connecting directly or indirectly with video recording equipment, and further comprising an arm support (5) connected to one end of the handle gripping part (42), the arm support (5) being a mechanical structure of a fixed shape capable of bearing a load. A rear end of the arm support (5) can support the lower part of the user&#39;s arm, making it possible to use principles of leverage to greatly reduce strain on the wrist, making the user less susceptible to tiring, and making hand-held operation more flexible. The present handle exhibits a reasonable structure, and is more effort-saving and comfortable when being used for hand-held filming, while also helping to maintain stability over long periods of filming and improving filming results.
Answer: B