Methods, systems, and apparatus for neural signal detection

• US 10,398,332 B2
• Filed: 10/01/2014
• Issued: 09/03/2019
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: St Jude Medical Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: St Jude Medical Incorporated (Abbott Laboratories Incorporated)
• Inventors: Min, Xiaoyi, Rosenberg, Stuart, Mouchawar, Gabriel
• Primary Examiner(s): Eiseman, Adam J
• Application Number:
  US14/503,799
• Publication Number:
  US 20150018656A1
• Time in Patent Office: 1,798 Days
• Field of Search: 600544-547
• CPC Class Codes: A61B 18/12 by passing a current through the tissue to be heated, e.g. high-frequency current
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/00267 having a basket shaped structure
• CPC Class Codes: A61B 2018/00404 Blood vessels other than those in or around the heart
• CPC Class Codes: A61B 2018/00434 Neural system
• CPC Class Codes: A61B 2018/00511 Kidney
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00839 Bioelectrical parameters, e.g. ECG, EEG
• CPC Class Codes: A61B 5/24 Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/4836 Diagnosis combined with treatment in closed-loop systems or methods A61B5/0036 takes precedence
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence

Abstract

Methods, systems, and apparatus for signal detection are described. In one example, a detection assembly includes a signal detector. The signal detector is configured to receive a sensor signal having a peak magnitude and a first frequency and generate an output signal having a magnitude proportional to the peak magnitude of the sensor signal and having a second frequency less than the first frequency of the sensor signal.

Claims

1. A neural signal detector comprising:

a rectifier circuit configured to receive a time varying neural signal having a first frequency from a neural sensor and output a rectified signal corresponding to the received signal; and

a peak detector circuit operatively connected to the rectifier circuit to receive the rectified signal and configured to provide an output signal comprising a positive square wave having a peak magnitude proportional to a peak magnitude of the rectified signal and having a second frequency less than the first frequency of the neural signal.

2. The neural signal detector of claim 1 wherein the rectifier circuit comprises a passive rectifier circuit.

3. The neural signal detector of claim 2 wherein the passive rectifier circuit includes a diode.

4. The neural signal detector of claim 3 wherein the diode is a Schottky diode.

5. The neural signal detector of claim 1 wherein the rectifier circuit comprises an active rectifier circuit.

6. The neural signal detector of claim 5 wherein the active rectifier circuit comprises a full wave active rectifier.

7. The neural signal detector of claim 1 wherein the peak detector circuit comprises a passive peak detector circuit.

8. The neural signal detector of claim 7 wherein the passive peak detector circuit comprises a resistor coupled in parallel with a capacitor.

9. The neural signal detector of claim 1 wherein the peak detector circuit is an active peak detector circuit.

10. The neural signal detector of claim 9 wherein the active peak detector circuit comprises at least one operational amplifier.

11. A detection assembly comprising:

a signal detector comprising;

a rectifier circuit configured to receive a sensor signal having a peak magnitude and a first frequency; and

a peak detector circuit configured to generate an output signal comprising a positive square wave having a magnitude proportional to the peak magnitude of the sensor signal and having a second frequency less than the first frequency of the sensor signal.

12. The detection assembly of claim 11 further comprising a sensor operatively coupled to the signal detector and operable to generate the sensor signal.

13. The detection assembly of claim 12 wherein the sensor is a neural sensor operable to generate the sensor signal in response to a neural signal proximate the neural sensor.

14. The detection assembly of claim 11 further comprising a controller operatively coupled to the signal detector to receive the output signal.

15. The detection assembly of claim 14 wherein the controller is operable to sample the output signal at a maximum sampling rate less than the first frequency.

16. The detection assembly of claim 14 wherein the controller is operable to sample the output signal at a maximum sampling rate less than twice the first frequency.