Continuous measurement and mapping of physiological data

• US 8,200,308 B2
• Filed: 07/11/2008
• Issued: 06/12/2012
• Est. Priority Date: 07/18/2007
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Inventors: Zhang, Hongxuan, Koertge, Detlef W.
• Primary Examiner(s): Cohen, Lee S
• Assistant Examiner(s): Cardinal, Erin M
• Application Number:
  US12/171,421
• Publication Number:
  US 20090024016A1
• Time in Patent Office: 1,432 Days
• Field of Search: 600372-374, 600/381, 600/393, 600/481, 600/486, 600/549, 374/137, 374/152, 374/166
• US Class Current: 600/374
• 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 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00767 Voltage
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00797 measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00815 measured by a thermistor
• CPC Class Codes: A61B 2562/182 Electrical shielding, e.g. using a Faraday cage
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/287 Holders for multiple electrodes, e.g. electrode catheters for electrophysiological study [EPS]

Abstract

A catheter has a plurality of sensors and electrodes, wherein the sensors are arranged alternately and spaced apart from each other. A system for continuous measurement and mapping of physiological data may use such a catheter with a coupling unit for insulated coupling of the plurality of sensors with a measurement unit and a mapping unit for mapping values received from the sensors to a predefined matrix.

Claims

1. A system for continuous measurement and mapping of physiological data comprising:

an intra-cardiac catheter comprising a plurality of spaced apart temperature sensors for concurrently sensing a plurality of temperatures at different locations within a patient heart;

a coupling unit configured for isolated coupling of data representing the sensed plurality of temperatures from the plurality of temperature sensors with a measurement unit; and

a mapping unit, in said measurement unit, configured for mapping individual values received from said sensors to corresponding respective particular elements of a matrix of a plurality of elements associated with heart locations, individual elements of said plurality of elements comprising a temperature value and temperature variability data of a particular respective heart location enabling monitoring heart function, blood flow, and abnormal temperature locations indicating pathology.

2. The system according to claim 1, wherein said coupling unit provides isolated coupling of data representing the sensed plurality of temperatures of said plurality of temperature sensors using an isolation device and voltage to frequency converter using a predetermined frequency range.

3. The system according to claim 2, comprising a plurality of catheters each comprising a plurality of spaced apart sensors.

4. The system according to claim 2, wherein said catheter further comprises a plurality of electrophysiological (EP) electrodes spaced apart from said temperature sensors.

5. The system according to claim 3, wherein temperature sensors and EP electrodes are alternately positioned along at least a portion of the catheter catheters.

6. The system according to claim 2, wherein the temperature sensors are thermistors and said coupling unit comprises a first isolating transformer for transmitting a current to said plurality of temperature sensors and said coupling unit further comprises for each temperature sensor an associated voltage to frequency converter and individual voltage to frequency converters use non-overlapping frequency ranges.

7. The system according to claim 6, wherein said coupling unit comprises at least one second isolating transformer coupled to at least one of the voltage to frequency converters.

8. The system according to claim 2, wherein the temperature sensors are thermistors.

9. The system according to claim 2, wherein the mapping unit is operable to track a heart function, blood flow or abnormal temperature locations.

10. A system for continuous measurement and mapping of physiological data comprising:

a catheter comprising a plurality of spaced apart thermistors;

a coupling unit configured for isolated coupling of the plurality of thermistors with a measurement unit and including a first isolating transformer for transmitting a current to said plurality of thermistors and said coupling unit further comprises for each thermistor an associated voltage to frequency converter and at least one second isolating transformer coupled to said voltage to frequency converter and each voltage to frequency converter has a predefined frequency range which is non-overlapping with another frequency converter; and

a mapping unit configured for mapping values received from said thermistors to a predefined matrix.

11. A system for continuous measurement and mapping of physiological data comprising:

an intra-cardiac catheter comprising a plurality of spaced apart pressure sensors for concurrently sensing a plurality of pressures at different locations within a patient heart;

a coupling unit configured for isolated coupling of data representing the sensed plurality of pressures from the plurality of pressure sensors with a measurement unit; and

a mapping unit, in said measurement unit, configured for mapping individual values received from said sensors to corresponding respective particular elements of a matrix of a plurality of elements associated with heart locations, individual elements of said plurality of elements comprising a pressure value and pressure variability data of a particular respective heart location enabling monitoring heart function, blood flow, and abnormal pressure locations indicating pathology.

12. An intra-cardiac catheter system comprising

a plurality of temperature sensors and electrodes, wherein the temperature sensors and electrodes are alternately positioned along at least a portion of a catheter and are spaced apart from each other, said temperature sensors concurrently sensing a plurality of temperatures at different locations within a patient heart;

and

a mapping unit configured for mapping individual values received from said sensors via a coupling unit, to corresponding respective particular elements of a matrix of a plurality of elements associated with heart locations, individual elements of said plurality of elements comprising a temperature value, electrode signal value and temperature variability data of a particular respective heart location enabling monitoring heart function, blood flow, and abnormal temperature locations indicating pathology.

13. The catheter system according to claim 12, wherein the coupling unit provides isolated coupling of data representing the sensed plurality of temperatures of said plurality of temperature sensors using an isolation device and voltage to frequency converter using a predetermined frequency range.

14. The catheter system according to claim 13, wherein the temperature sensors are thermistors.

15. The catheter system according to claim 14, wherein said coupling unit comprises a first isolating transformer for transmitting a current to said thermistors.

16. The catheter system according to claim 15, wherein said coupling unit further comprises for each temperature sensor an associated voltage to frequency converter and at least one second isolating transformer coupled to at least one of said voltage to frequency converters.

17. An intra-cardiac catheter system comprising

a plurality of pressure sensors and electrodes, wherein the pressure sensors and electrodes are alternately positioned along at least a portion of a catheter and are spaced apart from each other, said pressure sensors concurrently sensing a plurality of pressures at different locations within a patient heart;

and

a mapping unit configured for mapping individual values received from said sensors via a coupling unit, to corresponding respective particular elements of a matrix of a plurality of elements associated with heart locations, individual elements of said plurality of elements comprising a pressure value, electrode signal value and pressure variability data of a particular respective heart location enabling monitoring heart function, blood flow, and abnormal pressure locations indicating pathology.

18. A catheter comprising a plurality of sensors and electrodes, including,

a plurality of thermistors and electrodes alternately positioned along at least a portion of the catheter and spaced apart from each other;

a coupling unit configured for isolated coupling of said plurality of thermistors with a measurement unit using a first isolating transformer for transmitting a current to said thermistors and for each thermistor an associated voltage to frequency converter and each voltage to frequency converter has a predefined frequency range which is non-overlapping with another frequency converter and a single isolating transformer coupled with said voltage to frequency converters.

19. A method for continuously measuring and mapping of physiological data, comprising the steps of:

using an intra-cardiac catheter comprising a plurality of spaced apart temperature sensors for concurrently sensing a plurality of temperatures at different locations within a patient heart;

electrically coupling data representing the sensed plurality of temperatures from the plurality of temperature sensors to a measurement unit;

using said measurement unit for mapping individual values received from said sensors to corresponding respective particular elements of a matrix of a plurality of elements associated with heart locations, individual elements of said plurality of elements comprising a temperature value and temperature variability data of a particular respective heart location enabling monitoring heart function, blood flow, and abnormal temperature locations indicating pathology.

20. The method according to claim 19, wherein said sensors are thermistors and including the step of coupling of data representing the sensed plurality of temperatures of said plurality of temperature sensors using an isolation device and voltage to frequency converter using a predetermined frequency range.

21. The method according to claim 20, further comprising the step of transmitting power through a first isolating transformer for transmitting a current to said thermistors.

22. The method according to claim 21, further comprising the steps of measuring a voltage for each thermistor, converting said voltage into a signal having a frequency dependent on said voltage, transmitting said signal through a second isolating transformer, and converting said transmitted signal into a voltage.

23. The method according to claim 20, further comprising the step of tracking a heart function, blood flow or abnormal temperature locations.

24. The method according to claim 19, further comprising the step of providing a plurality of catheters each comprising a plurality of spaced apart temperature sensors and wherein each catheter further comprises a plurality of electrophysiological (EP) electrodes spaced apart from said temperature sensors.