Please select the most similar patent number from A, B, C and D. Which number is?
An automotive front seat overhead airbag (10) comprising a supporting air chamber (1) mounted on a roof of a vehicle and a protective gas chamber (2), wherein the supporting air chamber (1) is unfolded from the vehicle roof towards an instrument panel, the protective gas chamber (2) is in communication with the supporting air chamber (1), after the supporting air chamber (1) is unfolded, the protective air chamber (2) is unfolded from the supporting air chamber (1) towards a human body (100), a first protection space (3) is left between the supporting air chamber (1) and the protective air chamber (2) on the side facing the human body (100), and the first protection space (3) corresponds to the head of the human body and is used for protecting the head and the neck of the human body (100). An automobile comprising the vehicle roof and the instrument panel, and further comprising the automotive front seat overhead airbag (10), wherein the upper end of the supporting air chamber (1) is connected to a gas generator. Passenger injury can be avoided under child off-site operating conditions and no load operating conditions.
A: An integral door seal having an auxiliary energy-saving structure, comprising an outer air chamber (201) arranged between the refrigeration appliance body (1) and the door body (3); the outer air chamber (201) and a magnetic strip air chamber (202) are connected, and said outer air chamber (201) and magnetic strip air chamber (202) are both connected to a supporting air chamber (205); the supporting air chamber (205) is connected with a small chamber (217) by means of a small-chamber support rib (209). Near the vertical gap between the appliance body (1) and the door body (3), the outer air chamber (201) is connected to an auxiliary air chamber (211) by means of a connecting rib (218); the auxiliary air chamber (211) is arranged between the corner (11) of the appliance body side beam and the corner (31) of a projecting portion of the door body (3). The supporting air chamber (205) is provided with a first supporting bend (2061) and a second supporting bend (2062), said two supporting bends self-adaptively deforming in response to pressure applied to the door seal, and thus compensating for the deformation caused by the difference between the gap between an appliance body (1) and a door body (3) and a theoretical value for same, and obviating cold escape, freezing condensation and similar problems.
B: Provided in the present invention is a nerve monitoring endotracheal cannula, the endotracheal cannula comprising: an endotracheal guide tube; an annular balloon, used for sealing the gap between the endotracheal guide tube and the trachea of the patient, the annular balloon being disposed annularly on the outer wall of the endotracheal guide tube; a support balloon, used for positioning the endotracheal cannula, the support balloon being arranged on the side of the endotracheal guide tube facing the glottis, and the support balloon adapting to the shape of the glottis after inflation and expansion; and a first inflation assembly and a second inflation assembly for inflating the annular balloon and the support balloon respectively.
C: Disclosed in the present invention is a built-in electric inflated and exhausted heat-insulating sun-screening device for an automobile, which comprises an air curtain (1) matched with the interior of the automobile; the outer surface of the air curtain is provided with a heat-insulating sun-screening layer (2); a position of the air curtain (1) close to the middle is downwards provided with a supporting air column (3); the supporting air column (3) is provided with an inflation and exhaust hole (4) which is connected with an inflation and exhaust pump (5); the supporting air column (3) is arranged in an accommodating box (6), so that the whole air curtain (1) and the supporting air column (3) are accommodated in the accommodating box (6) in the folding process. The inflation and exhaust pump (5) is arranged in the accommodating box (6) or outside the accommodating box (6), and has a battery structure or is connected with a cigar lighter jack to be charged. By the built-in structure, the device does not influence the beauty of the automobile during parking, and dust can not fall on the device. The device is convenient to support and accommodate, can well protect electronic elements in the automobile from being insolated for a long time so as not to shorten the service life of the electronic elements, and can also prevent harmful substances from releasing due to insolation of the interior trim parts, so that the health of a user is not influenced.
D: An airbag, an airbag system, and an automobile. When in an uninflated state, the airbag is accommodated in an upper frame member of a front windshield. After being trigged, the airbag inflates vertically downward. The airbag in the inflated state has a main bag. The main bag has a drop-shaped longitudinal cross-section. Since the airbag does not occupy a space within a dashboard, a front passenger has a larger space, thereby enhancing comfort for the passenger. Moreover, the airbag can inflate quickly and thus exhibits good safety performance.
Answer: D