Two-stage calibration of medical probes

• US 20070185397A1
• Filed: 02/09/2006
• Published: 08/09/2007
• Est. Priority Date: 02/09/2006
• Status: Active Grant

• Current Assignee: Biosense Webster Incorporated (Johnson & Johnson)
• Original Assignee: Biosense Webster Incorporated (Johnson & Johnson)
• Inventors: Govari, Assaf, Ephrath, Yaron, Model, Dmitri, Altmann, Andres
• Granted Patent: US 7,860,553 B2
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 2017/00482 with a code
• CPC Class Codes: A61B 2562/085 combined with means for recording calibration data
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61B 5/283 Invasive
• CPC Class Codes: A61B 8/12 in body cavities or body tracts, e.g. by using catheters catheters per se A61M25/00
• CPC Class Codes: A61B 8/4254 using sensors mounted on the probe
• CPC Class Codes: A61B 8/4411 Device being modular

Abstract

A probe for insertion into the body of a subject includes a sensor, a first microcircuit, which stores first calibration data with respect to the sensor, and a first connector at the proximal end of the probe. A probe adapter includes a second connector, which mates with the first connector, a signal processing circuit, which is processes the sensor signal, and a second microcircuit, which stores second calibration data with respect to the signal processing circuit. A microcontroller in the adapter receives the first and second calibration data and computes combined calibration data. The adapter includes a third connector, which mates with a fourth connector on a console. The console includes signal analysis circuitry, which analyzes the processed signal using the combined calibration data provided by the probe adapter.

Claims

1. Medical apparatus, comprising:

a probe, having a proximal end and a distal end, which is adapted for insertion into the body of a subject, the probe comprising;

a sensor, which outputs a sensor signal;

a first microcircuit, which stores first calibration data with respect to the sensor; and

a first connector at the proximal end of the probe, electrically coupled at least to the sensor;

a probe adapter, comprising;

a second connector, which is arranged to mate with the first connector;

a signal processing circuit, which is coupled to process the sensor signal so as to output a processed signal;

a second microcircuit, which stores second calibration data with respect to the signal processing circuit;

a microcontroller, which is arranged to receive the first and second calibration data from the first and second microcircuits, respectively, and to compute combined calibration data based on the first and second calibration data; and

a third connector, electrically coupled at least to the signal processing circuit; and

a console, comprising;

a fourth connector, which is arranged to mate with the third connector; and

signal analysis circuitry, which is coupled to receive at least the processed signal from the fourth connector and is arranged to analyze the processed signal using the combined calibration data provided by the probe adapter.

2. The apparatus according to claim 1, wherein the sensor comprises a position sensor, and wherein the signal analysis circuitry is operative to determine coordinates of the distal end of the probe by analyzing the processed signal.

3. The apparatus according to claim 2, wherein the position sensor is operative to generate the sensor signal responsively to a magnetic field applied externally to the body.

4. The apparatus according to claim 1, wherein the probe comprises a catheter for insertion into a heart of the subject.

5. The apparatus according to claim 1, wherein the probe is a first type of probe, and the processed signal is a first processed signal, and

wherein the console is further operable in conjunction with a second type of probe, which is adapted to mate with the fourth connector and to convey at least a second processed signal to the fourth connector, and which includes a memory circuit, which stores third calibration data in a predetermined address space, which is accessed by the signal analysis circuitry in analyzing the second processed signal, and

wherein the microcontroller is operative to place the combined calibration data in the predetermined address space for reading by the processing circuitry.

6. The apparatus according to claim 5, wherein the console is operable in conjunction with both of the first and second types of probe without hardware or software modification according to probe type.

7. The apparatus according to claim 1, wherein the first calibration data are indicative of a sensitivity of the sensor and of a phase deviation introduced by the probe, and wherein the signal processing circuit comprises an amplifier, and the second calibration data are indicative of a gain of the amplifier and a second phase deviation introduced by the amplifier.

8. The apparatus according to claim 1, wherein at least the first and second connectors comprise shielding against magnetic interference.

9. A method for performing an invasive medical procedure, comprising:

providing a probe, having a proximal end and a distal end, which comprises a sensor, which outputs a sensor signal, a first microcircuit, which stores first calibration data with respect to the sensor, and a first connector at, the proximal end of the probe, electrically coupled at least to the sensor;

connecting the first connector of the probe to a second connector of a probe adapter, which comprises a signal processing circuit, which is coupled to process the sensor signal so as to output a processed signal, and a second microcircuit, which stores second calibration data with respect to the signal processing circuit, and a third connector, electrically coupled at least to the signal processing circuit;

using a microcontroller in the adapter, reading the first and second calibration data from the first and second microcircuits, respectively, and computing combined calibration data based on the first and second calibration data;

connecting the;

third connector of the adapter to a fourth connector of a console, which comprises signal analysis circuitry;

inserting the probe into a body of a subject; and

using the signal analysis circuitry, receiving via the fourth connector at least the processed signal from the adapter and analyzing the processed signal using the combined calibration data provided by the probe adapter while the probe is in the body.

10. The method according to claim 9, wherein the sensor comprises a position sensor, and wherein analyzing the processed signal comprises determining coordinates of the distal end of the probe.

11. The method according to claim 10, wherein the position sensor is operative to generate the sensor signal responsively to a magnetic field applied externally to the body.

12. The method according to claim 9, wherein the probe comprises a catheter for insertion into a heart of the subject.

13. The method according to claim 9, wherein the probe is a first type of probe, and the processed signal is a first processed signal, and wherein the console is further operable in conjunction with a second type of probe, which is adapted to mate with the fourth connector and to convey at least a second processed signal to the fourth connector, and which includes a memory circuit, which stores third calibration data in a predetermined address space, which is accessed by the signal analysis circuitry in analyzing the second processed signal, and

wherein computing the combined calibration data comprises placing the combined calibration data in the predetermined address space for reading by the processing circuitry.

14. The method according to claim 13, wherein the console is operable in conjunction with both of the first and second types of probe without hardware or software modification according to probe type.

15. The method according to claim 9, wherein the first calibration data are indicative of a sensitivity of the sensor and of a phase deviation introduced by the probe, and wherein the signal processing circuit comprises an amplifier, and the second calibration data are indicative of a gain of the amplifier and a second phase deviation introduced by the amplifier.

16. The method according to claim 9, wherein connecting the first connector to the second connector comprises shielding at least the first and second connectors against magnetic interference.