Use of one or more evoked response signals to determine an insertion state of an electrode lead during an electrode lead insertion procedure

A method comprising:

• directing, by a diagnostic system, an acoustic stimulation generator to apply acoustic stimulation having a plurality of stimulus frequencies to a recipient of a cochlear implant during an insertion procedure in which an electrode lead communicatively coupled to the cochlear implant is inserted into a cochlea of the recipient, wherein stimulus frequencies included in the plurality of stimulus frequencies are concurrently applied to the recipient;
• directing, by the diagnostic system, the cochlear implant to use an electrode disposed on the electrode lead to record a plurality of evoked response signals during the insertion procedure, each evoked response signal included in the plurality of evoked response signals corresponding to a different stimulus frequency included in the plurality of stimulus frequencies and representative of evoked responses that occur within the recipient in response to the acoustic stimulation applied to the recipient;
• and
• determining, by the diagnostic system based on an amplitude and a phase of each of one or more evoked response signals included in the plurality of evoked response signals, an insertion state of the electrode lead within the cochlea of the recipient.

A non-transitory computer readable storage medium storing instructions that, when executed, direct a processor to:

• direct an acoustic stimulation generator to apply acoustic stimulation having a plurality of stimulus frequencies to a recipient of a cochlear implant during an insertion procedure in which an electrode lead communicatively coupled to the cochlear implant is inserted into a cochlea of the recipient, wherein stimulus frequencies included in the plurality of stimulus frequencies are concurrently applied to the recipient;
• direct the cochlear implant to use an electrode disposed on the electrode lead to record a plurality of evoked response signals during the insertion procedure, each evoked response signal included in the plurality of evoked response signals corresponding to a different stimulus frequency included in the plurality of stimulus frequencies and representative of evoked responses that occur within the recipient in response to the acoustic stimulation applied to the recipient;
• and
• determine based on an amplitude and a phase of each of one or more evoked response signals included in the plurality of evoked response signals, an insertion state of the electrode lead within the cochlea of the recipient.