Abstract

The invention relates to a probe buffer (100) for buffering measured signals of an object (11) generating or conducting these signals, comprising: a first receive buffer (110) comprising a first receive input (111) adapted for receiving a first measured signal (116) based on a first generated or conducted signal (115) of the object via a first conductive path (31) having a first bandwidth (118), and arranged for providing a first buffered signal (117) based on buffering the first measured signal; a first bandwidth adaptation unit (120) arranged for adapting the first bandwidth; a second receive buffer (130) comprising a second receive input (131) adapted for receiving a second measured signal (136) based on a second generated or conducted signal (135) of the object via a second conductive path (32) having a second bandwidth (138), and arranged for providing a second buffered signal (137) based on buffering the second measured signal; a comparison unit (150) arranged for providing a comparison signal (151) based on the comparison of the first buffered signal and the second buffered signal; and a controller (160) arranged for controlling the first bandwidth adaptation unit based on the comparison signal such that a difference between the first bandwidth and the second bandwidth is reduced.

IPC Classes  ?

• A61B 5/305 - Common mode rejection
• A61B 5/00 - Measuring for diagnostic purposes Identification of persons

IPC Classes  ?

• A61B 5/00 - Measuring for diagnostic purposes Identification of persons
• A61B 5/276 - Protection against electrode failure
• A61B 5/30 - Input circuits therefor
• A61B 5/301 - Input circuits therefor providing electrical separation, e.g. by using isolating transformers or optocouplers

Abstract

The invention relates to a medical probe buffer for buffering a measured physiological signal of a human body, comprising: at least one receive port couplable to a receive wire, which is arranged for conducting a signal based on a physiological signal of the human body; each receive port having an associated receive buffer arranged for buffering the signal from the respective receive port, wherein each receive buffer comprises an input, and an output; each receive port having an associated receive resistor conductively arranged between the respective receive port and the input of the respective receive buffer; at least one transmit port couplable to a transmit wire, which is arranged for conducting a signal to the human body; each transmit port having an associated transmit buffer arranged for buffering the signal provided to the respective transmit port, wherein each transmit buffer comprises an input, and an output; and each transmit port having an associated transmit resistor conductively arranged between the output of the transmit buffer and the transmit port; wherein a resistor group is formed by the receive resistor and the transmit resistor; and wherein the resistance values of the resistors in the resistor group are preselected such that a current through the human body does not exceed a safety threshold current when an electrical short-circuit fault occurs in a resistor in the resistor group.

IPC Classes  ?

• A61B 5/00 - Measuring for diagnostic purposes Identification of persons
• A61B 5/276 - Protection against electrode failure
• A61B 5/30 - Input circuits therefor
• A61B 5/301 - Input circuits therefor providing electrical separation, e.g. by using isolating transformers or optocouplers