Neuromodulation catheters with nerve monitoring features for transmitting digital neural signals and associated systems and methods
Neuromodulation catheters with nerve monitoring features for transmitting digital neural signals and associated systems and methods are disclosed herein. A neuromodulation catheter configured in accordance with some embodiments of the present technology can include, for example, a handle and an elongated shaft attached to the handle. The shaft can have a proximal portion and a distal portion configured to be moved within a lumen of a blood vessel of a human patient. The neuromodulation catheter can further include an array of contacts at the distal portion of the shaft and a digitizer at the handle or the shaft. The contacts can be configured to detect analog neural signals from within the blood vessel. The digitizer can be configured to receive the analog neural signals from the contacts, digitize the analog neural signals into digital neural signals, and transmit the digital neural signals to a read/write module external to the patient.
1. A method of detecting neural activity from within a blood vessel of a human, the method comprising:
delivering a distal portion of a neuromodulation catheter to a target site within the blood vessel of the human, wherein the distal portion comprises a plurality of contacts;
recording a plurality of analog neural signals taken during a plurality of different time intervals using the plurality of contacts; delivering neuromodulation energy via the plurality of contacts to the target site within the blood vessel of the human; digitizing the
recorded analog neural signals via digitizer operably coupled to the contacts, wherein the digitizer is integrated with a proximal portion of the neuromodulation catheter, and wherein digitizing recorded analog neural signals comprises digitizing each of the recorded neural signals; and
transmitting the digital neural signals to a read/write module external to the human, wherein
transmitting the digital neural signals to the read/write module comprises transmitting each of the digital neural signals to the read/write module after each time interval; and
averaging the digital neural signals at the read/write module to determine nerve activity proximate to the contacts.
2. The method of claim 1 wherein digitizing the recorded analog neural signals is performed while the neuromodulation catheter is within the human.
3. The method of claim 1 , further comprising filtering the recorded analog neural signals with the digitizer to differentiate electroneurogram (ENG) signals from electromyogram (EMG) signals.
4. The method of claim 1 , further comprising filtering the recorded analog neural signals with the digitizer using quasi-tripole (QT), true-tripole (TT), and/or adaptive-tripole (AT) signal processing techniques to detect electroneurogram (ENG) signals, wherein the analog neural signals are filtered before digitizing.
5. The method of claim 1 ,
wherein the recording, digitizing, and transmitting steps are performed before and after delivery of the neuromodulation energy; and
further comprising comparing electroneurogram (ENG) signals recorded before and after delivery of the neuromodulation energy.
6. The method of claim 5 , further comprising delivering neuromodulation energy at the target site for a second time when there is not a decrease in the ENG signal detected after energy delivery.
7. The method of claim 5 wherein the target site is a first target site, and wherein the method further comprises:
repositioning the energy delivery element to a second target site within the blood vessel; and
delivering neuromodulation energy to the second target site via the energy delivery element, wherein the recording, digitizing, and transmitting steps are performed before and after delivery of the neuromodulation energy.
8. The method of claim 1 , further comprising comparing electroneurogram (ENG) signals taken at the plurality of different time intervals.
9. The method of claim 1 wherein transmitting the digital neural signals comprises wirelessly transmitting the digital neural signals from within the human to the read/write module.
10. The method of claim 1 wherein transmitting the digital neural signals comprises inductively transmitting the digital neural signals from within the human to the read/write module.
11. The method of claim 1 wherein the neuromodulation catheter comprises a handle at the proximal portion of the neuromodulation catheter, and wherein the digitizer is at the handle.
12. The method of claim 1 , wherein the recording, digitizing, and transmitting steps are performed before and/or after delivery of the neuromodulation energy.
13. The method of claim 12 wherein delivering neuromodulation energy comprises delivering radiation to a vessel wall at the target site.