Please select the most similar patent number from A, B, C and D. Which number is?
A nerve electrical stimulation system, comprising an extension wire (100) and an electrode wire connected to the extension wire (100). A channel (12) is arranged in the extension wire (100), the electrode wire is inserted into the channel (12) and is in butted with the extension wire (100), and a fixing assembly (13) used for limiting movement of the electrode wire in the channel (12) is arranged in the channel (12). The nerve electrical stimulation system skips the step of additional sealing after butting the electrode wire and the extension wire (100), and uses a fixing assembly (13) which is reliable, simple in structure, easy to manufacture, excellent in sealing performance, low in cost, and time-saving, labor-saving and reliable.
A: The present invention relates to a balloon electrode catheter, comprising an outer tube, a balloon, electrode sheets, and electrode wires. A first end of the outer tube is connected to a proximal end of the balloon; the electrode wire passes through the outer tube; the number of the electrode sheets is an even number; positive and negative electrode sheets are uniformly arranged at intervals on the outer surface of an annular side wall of the balloon at the same height, and the electrode sheets are respectively connected to the respective electrode wires; after the balloon is pressurized and expanded, the electrode sheets abut against the pulmonary vein ostium to form an annular ablation zone. According to the balloon electrode catheter provided by the embodiments of the present invention, uniformly distributed electrode sheets are arranged on the surface of the balloon, an effective annular pulse electric field can be generated, a target tissue can be selectively ablated, and damage to cells is reduced. When the balloon electrode catheter is attached to the generally oval pulmonary vein ostium, pressurization on the balloon can change the shape of the pulmonary vein ostium, and the balloon electrode catheter can easily fit different pulmonary vein ostia.
B: Disclosed is a leakage detection device (30) for medical devices, comprising a substrate (31) having a surrounding portion for surrounding and exposing a contact area (11) of the medical device with the skin; a leakage detection circuit (32) disposed on an upper surface of the substrate (31) and comprising a first electrode lead (321) and a second electrode lead (322) spaced apart from each other, which are conducted and short-circuited when they are crossed by liquid; and an alarm module (33) electrically connected to said first and second electrode leads, which is triggered when said first and second electrode leads are conducted and short-circuited. The leakage detection device (30) can easily and accurately realize the detection of leakage, with low cost, simple process, and high accuracy and safety.
C: Disclosed are a mapping guide wire (100), and a three-dimensional mapping device (200) using same. The mapping guide wire (100) comprises a guide wire core (10), a guide wire sleeve (20), an electrode wire (30), a front-end electrode (40), and a rear-end electrode (50), wherein the guide wire sleeve (20) is sheathed outside the guide wire core (10) and the electrode wire (30); the front-end electrode (40) and the rear-end electrode (50) are respectively arranged at a distal end and a proximal end of the guide wire core (10); two ends of the electrode wire (30) are respectively connected to the front-end electrode (40) and the rear-end electrode (50); and the rear-end electrode (50) is connected to the three-dimensional mapping device (200). The device is simple to operate, and can rapidly map electric signals collected by the front-end electrode (40).
D: Disclosed are a transcutaneous electrical nerve stimulation electrode needle and a transcutaneous electrical nerve stimulation apparatus. The transcutaneous electrical nerve stimulation electrode needle comprises: a needle handle (100), wherein a first electrode and a second electrode for respectively inputting pulse current signals of different polarities are arranged inside the needle handle (100); and at least one first needle body (201) and at least one second needle body (202), wherein the first needle body (201) and the second needle body (202) both comprise a first end and a second end, wherein the first end of the first needle body (201) is electrically connected to the first electrode, and the first end of the second needle body (202) is electrically connected to the second electrode, such that an electric field can be generated between the second end of the first needle body (201) and the second end of the second needle body (202).
Answer: D