ASIC with switching noise reduction

• US 10,314,507 B2
• Filed: 11/14/2016
• Issued: 06/11/2019
• Est. Priority Date: 11/14/2016
• Status: Active Grant

• Current Assignee: Biosense Webster Incorporated (Johnson & Johnson)
• Original Assignee: Biosense Webster Incorporated (Johnson & Johnson)
• Inventors: Govari, Assaf, Altmann, Andres Claudio, Ephrath, Yaron, Khudish, Oleg
• Primary Examiner(s): Bertram, Eric D.
• Application Number:
  US15/350,236
• Publication Number:
  US 20180132749A1
• Time in Patent Office: 939 Days
• 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 2018/00351 Heart
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00839 Bioelectrical parameters, e.g. ECG, EEG
• CPC Class Codes: A61B 2560/045 with a separable interface unit, e.g. for communication
• CPC Class Codes: A61B 5/00 Measuring for diagnostic purposes radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00; Identification of persons
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61B 5/283 Invasive
• CPC Class Codes: A61B 5/287 Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/304 Switching circuits
• CPC Class Codes: A61B 5/6858 with a distal basket, e.g. expandable basket
• CPC Class Codes: A61B 5/6859 with multiple distal splines
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7225 Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation A61B5/30, A61B5/316 take precedence; transformers for specific applications H01F38/00; amplifiers H03F
• CPC Class Codes: H03F 3/45475 using IC blocks as the active amplifying circuit
• CPC Class Codes: H03M 1/1225 using time-division multiplexing
• CPC Class Codes: H03M 1/662 Multiplexed conversion systems

Abstract

Medical catheterization is carried out by receiving a plurality of analog bioelectric signals in respective channels and multiplexing the bioelectric signals in respective selection events. The selection events comprise making a first connection with a reference voltage, thereafter breaking the first connection and making a second connection with one of the bioelectric signals. The method is further carried out by outputting the multiplexed bioelectric signals to an analog-to-digital converter.

Claims

1. An apparatus comprising

a catheter having an elongated distal portion;

a plurality of electrodes on the distal portion for reading bioelectric signals;

a multiplexor having inputs connected to respective ones of the electrodes and having an output;

a switch having a first input terminal connected to a reference signal, a second input terminal linked to the output of the multiplexor, and an output terminal; and

control circuitry linked to the switch and the multiplexor and operative to make a first connection between the output terminal of the switch and the reference signal via the first input terminal of the switch; and

thereafter to break the first connection and to make a second connection between the output terminal of the switch and the output of the multiplexor via the second input terminal of the switch,

wherein the control circuitry comprises a differential amplifier having first and second inputs and having first and second outputs connected to the first and second input terminals of the switch, respectively, wherein the first input of the differential amplifier is connected to a Wilson central terminal, and the second input of the differential amplifier is linked to one of the bioelectric signals.

2. The apparatus according to claim 1, wherein the bioelectric signals are analog signals, further comprising an analog-to-digital converter connected to the output terminal of the switch and linked to a processor.

3. The apparatus according to claim 1, wherein the switch is a double pole double throw switch.

4. The apparatus according to claim 1, wherein the Wilson central terminal is connected to a dynamic offset voltage.