Hello,
It is my first post on this forum and first of all, thank you for these very precious information !
I tried to read as many threads as I can on this topic, but I am a little bit confused. We are designing a battery powered medical device. While in use by the patient, it is totally wireless, and worn on the patient or hand-handled. The device can be charged via USB, but it is quite impossible that the patient use it at the same time: the device is automatically off while charging, and the usb connector is located in a way that if it is plugged, the patient can not wear the device correctly. Plus, we provide a charger with 2MOPP within (if it can help).
The battery is a LiPo (which come certified with the correct IEC...) and the maximum voltage within the device is 5V. I have an SPO2 sensor and mini-camera (for otoscope purpose). The SPO2 is integrated in the main enclosure of the device, and the camera is attached with a 10cm cable (which cannot be unconnected). Again, while used by the patient, the device is fully wireless.
The labs said that I need to provide 2 MOPP for SPO2 and camera. Which involve to have a 1000Vrms insulation, clearance/creepage 3.4m/1.5mm. Which is huge especially on the camera side. The point, actually, is that I don't understand why I must do this, as I don't understand where the current can flow if the device is battery powered. Moreover, there is no intentional electrical contact (whereas ECG probe for example).
Can you help me clarify this please ?
It is my first post on this forum and first of all, thank you for these very precious information !
I tried to read as many threads as I can on this topic, but I am a little bit confused. We are designing a battery powered medical device. While in use by the patient, it is totally wireless, and worn on the patient or hand-handled. The device can be charged via USB, but it is quite impossible that the patient use it at the same time: the device is automatically off while charging, and the usb connector is located in a way that if it is plugged, the patient can not wear the device correctly. Plus, we provide a charger with 2MOPP within (if it can help).
The battery is a LiPo (which come certified with the correct IEC...) and the maximum voltage within the device is 5V. I have an SPO2 sensor and mini-camera (for otoscope purpose). The SPO2 is integrated in the main enclosure of the device, and the camera is attached with a 10cm cable (which cannot be unconnected). Again, while used by the patient, the device is fully wireless.
The labs said that I need to provide 2 MOPP for SPO2 and camera. Which involve to have a 1000Vrms insulation, clearance/creepage 3.4m/1.5mm. Which is huge especially on the camera side. The point, actually, is that I don't understand why I must do this, as I don't understand where the current can flow if the device is battery powered. Moreover, there is no intentional electrical contact (whereas ECG probe for example).
Can you help me clarify this please ?
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